Merge tag 'fuse-update-5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse
Pull fuse updates from Miklos Szeredi:
- Support directly accessing host page cache from virtiofs. This can
improve I/O performance for various workloads, as well as reducing
the memory requirement by eliminating double caching. Thanks to Vivek
Goyal for doing most of the work on this.
- Allow automatic submounting inside virtiofs. This allows unique
st_dev/ st_ino values to be assigned inside the guest to files
residing on different filesystems on the host. Thanks to Max Reitz
for the patches.
- Fix an old use after free bug found by Pradeep P V K.
* tag 'fuse-update-5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse: (25 commits)
virtiofs: calculate number of scatter-gather elements accurately
fuse: connection remove fix
fuse: implement crossmounts
fuse: Allow fuse_fill_super_common() for submounts
fuse: split fuse_mount off of fuse_conn
fuse: drop fuse_conn parameter where possible
fuse: store fuse_conn in fuse_req
fuse: add submount support to <uapi/linux/fuse.h>
fuse: fix page dereference after free
virtiofs: add logic to free up a memory range
virtiofs: maintain a list of busy elements
virtiofs: serialize truncate/punch_hole and dax fault path
virtiofs: define dax address space operations
virtiofs: add DAX mmap support
virtiofs: implement dax read/write operations
virtiofs: introduce setupmapping/removemapping commands
virtiofs: implement FUSE_INIT map_alignment field
virtiofs: keep a list of free dax memory ranges
virtiofs: add a mount option to enable dax
virtiofs: set up virtio_fs dax_device
...
diff --git a/Documentation/filesystems/fuse.rst b/Documentation/filesystems/fuse.rst
index cd717f9..8120c3c 100644
--- a/Documentation/filesystems/fuse.rst
+++ b/Documentation/filesystems/fuse.rst
@@ -47,7 +47,7 @@
using the sftp protocol.
The userspace library and utilities are available from the
-`FUSE homepage: <http://fuse.sourceforge.net/>`_
+`FUSE homepage: <https://github.com/libfuse/>`_
Filesystem type
===============
diff --git a/MAINTAINERS b/MAINTAINERS
index 5919b75..084cb79 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -7238,7 +7238,7 @@
M: Miklos Szeredi <miklos@szeredi.hu>
L: linux-fsdevel@vger.kernel.org
S: Maintained
-W: http://fuse.sourceforge.net/
+W: https://github.com/libfuse/
T: git git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse.git
F: Documentation/filesystems/fuse.rst
F: fs/fuse/
diff --git a/drivers/dax/super.c b/drivers/dax/super.c
index e84070b..edc279b 100644
--- a/drivers/dax/super.c
+++ b/drivers/dax/super.c
@@ -46,7 +46,8 @@
int bdev_dax_pgoff(struct block_device *bdev, sector_t sector, size_t size,
pgoff_t *pgoff)
{
- phys_addr_t phys_off = (get_start_sect(bdev) + sector) * 512;
+ sector_t start_sect = bdev ? get_start_sect(bdev) : 0;
+ phys_addr_t phys_off = (start_sect + sector) * 512;
if (pgoff)
*pgoff = PHYS_PFN(phys_off);
diff --git a/fs/dax.c b/fs/dax.c
index 6ad3463..5b47834 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -559,8 +559,11 @@
}
/**
- * dax_layout_busy_page - find first pinned page in @mapping
+ * dax_layout_busy_page_range - find first pinned page in @mapping
* @mapping: address space to scan for a page with ref count > 1
+ * @start: Starting offset. Page containing 'start' is included.
+ * @end: End offset. Page containing 'end' is included. If 'end' is LLONG_MAX,
+ * pages from 'start' till the end of file are included.
*
* DAX requires ZONE_DEVICE mapped pages. These pages are never
* 'onlined' to the page allocator so they are considered idle when
@@ -573,12 +576,15 @@
* to be able to run unmap_mapping_range() and subsequently not race
* mapping_mapped() becoming true.
*/
-struct page *dax_layout_busy_page(struct address_space *mapping)
+struct page *dax_layout_busy_page_range(struct address_space *mapping,
+ loff_t start, loff_t end)
{
- XA_STATE(xas, &mapping->i_pages, 0);
void *entry;
unsigned int scanned = 0;
struct page *page = NULL;
+ pgoff_t start_idx = start >> PAGE_SHIFT;
+ pgoff_t end_idx;
+ XA_STATE(xas, &mapping->i_pages, start_idx);
/*
* In the 'limited' case get_user_pages() for dax is disabled.
@@ -589,6 +595,11 @@
if (!dax_mapping(mapping) || !mapping_mapped(mapping))
return NULL;
+ /* If end == LLONG_MAX, all pages from start to till end of file */
+ if (end == LLONG_MAX)
+ end_idx = ULONG_MAX;
+ else
+ end_idx = end >> PAGE_SHIFT;
/*
* If we race get_user_pages_fast() here either we'll see the
* elevated page count in the iteration and wait, or
@@ -596,15 +607,15 @@
* against is no longer mapped in the page tables and bail to the
* get_user_pages() slow path. The slow path is protected by
* pte_lock() and pmd_lock(). New references are not taken without
- * holding those locks, and unmap_mapping_range() will not zero the
+ * holding those locks, and unmap_mapping_pages() will not zero the
* pte or pmd without holding the respective lock, so we are
* guaranteed to either see new references or prevent new
* references from being established.
*/
- unmap_mapping_range(mapping, 0, 0, 0);
+ unmap_mapping_pages(mapping, start_idx, end_idx - start_idx + 1, 0);
xas_lock_irq(&xas);
- xas_for_each(&xas, entry, ULONG_MAX) {
+ xas_for_each(&xas, entry, end_idx) {
if (WARN_ON_ONCE(!xa_is_value(entry)))
continue;
if (unlikely(dax_is_locked(entry)))
@@ -625,6 +636,12 @@
xas_unlock_irq(&xas);
return page;
}
+EXPORT_SYMBOL_GPL(dax_layout_busy_page_range);
+
+struct page *dax_layout_busy_page(struct address_space *mapping)
+{
+ return dax_layout_busy_page_range(mapping, 0, LLONG_MAX);
+}
EXPORT_SYMBOL_GPL(dax_layout_busy_page);
static int __dax_invalidate_entry(struct address_space *mapping,
diff --git a/fs/fuse/Kconfig b/fs/fuse/Kconfig
index 774b261..40ce9a1 100644
--- a/fs/fuse/Kconfig
+++ b/fs/fuse/Kconfig
@@ -8,7 +8,7 @@
There's also a companion library: libfuse2. This library is available
from the FUSE homepage:
- <http://fuse.sourceforge.net/>
+ <https://github.com/libfuse/>
although chances are your distribution already has that library
installed if you've installed the "fuse" package itself.
@@ -38,3 +38,17 @@
If you want to share files between guests or with the host, answer Y
or M.
+
+config FUSE_DAX
+ bool "Virtio Filesystem Direct Host Memory Access support"
+ default y
+ select INTERVAL_TREE
+ depends on VIRTIO_FS
+ depends on FS_DAX
+ depends on DAX_DRIVER
+ help
+ This allows bypassing guest page cache and allows mapping host page
+ cache directly in guest address space.
+
+ If you want to allow mounting a Virtio Filesystem with the "dax"
+ option, answer Y.
diff --git a/fs/fuse/Makefile b/fs/fuse/Makefile
index 3e8cebf..8c7021f 100644
--- a/fs/fuse/Makefile
+++ b/fs/fuse/Makefile
@@ -7,5 +7,7 @@
obj-$(CONFIG_CUSE) += cuse.o
obj-$(CONFIG_VIRTIO_FS) += virtiofs.o
-fuse-objs := dev.o dir.o file.o inode.o control.o xattr.o acl.o readdir.o
-virtiofs-y += virtio_fs.o
+fuse-y := dev.o dir.o file.o inode.o control.o xattr.o acl.o readdir.o
+fuse-$(CONFIG_FUSE_DAX) += dax.o
+
+virtiofs-y := virtio_fs.o
diff --git a/fs/fuse/control.c b/fs/fuse/control.c
index a1303ad..cc7e94d7 100644
--- a/fs/fuse/control.c
+++ b/fs/fuse/control.c
@@ -164,6 +164,7 @@
{
unsigned val;
struct fuse_conn *fc;
+ struct fuse_mount *fm;
ssize_t ret;
ret = fuse_conn_limit_write(file, buf, count, ppos, &val,
@@ -174,18 +175,27 @@
if (!fc)
goto out;
+ down_read(&fc->killsb);
spin_lock(&fc->bg_lock);
fc->congestion_threshold = val;
- if (fc->sb) {
+
+ /*
+ * Get any fuse_mount belonging to this fuse_conn; s_bdi is
+ * shared between all of them
+ */
+
+ if (!list_empty(&fc->mounts)) {
+ fm = list_first_entry(&fc->mounts, struct fuse_mount, fc_entry);
if (fc->num_background < fc->congestion_threshold) {
- clear_bdi_congested(fc->sb->s_bdi, BLK_RW_SYNC);
- clear_bdi_congested(fc->sb->s_bdi, BLK_RW_ASYNC);
+ clear_bdi_congested(fm->sb->s_bdi, BLK_RW_SYNC);
+ clear_bdi_congested(fm->sb->s_bdi, BLK_RW_ASYNC);
} else {
- set_bdi_congested(fc->sb->s_bdi, BLK_RW_SYNC);
- set_bdi_congested(fc->sb->s_bdi, BLK_RW_ASYNC);
+ set_bdi_congested(fm->sb->s_bdi, BLK_RW_SYNC);
+ set_bdi_congested(fm->sb->s_bdi, BLK_RW_ASYNC);
}
}
spin_unlock(&fc->bg_lock);
+ up_read(&fc->killsb);
fuse_conn_put(fc);
out:
return ret;
diff --git a/fs/fuse/cuse.c b/fs/fuse/cuse.c
index 2cc1781..4508226 100644
--- a/fs/fuse/cuse.c
+++ b/fs/fuse/cuse.c
@@ -57,6 +57,7 @@
struct cuse_conn {
struct list_head list; /* linked on cuse_conntbl */
+ struct fuse_mount fm; /* Dummy mount referencing fc */
struct fuse_conn fc; /* fuse connection */
struct cdev *cdev; /* associated character device */
struct device *dev; /* device representing @cdev */
@@ -134,7 +135,7 @@
* Generic permission check is already done against the chrdev
* file, proceed to open.
*/
- rc = fuse_do_open(&cc->fc, 0, file, 0);
+ rc = fuse_do_open(&cc->fm, 0, file, 0);
if (rc)
fuse_conn_put(&cc->fc);
return rc;
@@ -143,10 +144,10 @@
static int cuse_release(struct inode *inode, struct file *file)
{
struct fuse_file *ff = file->private_data;
- struct fuse_conn *fc = ff->fc;
+ struct fuse_mount *fm = ff->fm;
fuse_sync_release(NULL, ff, file->f_flags);
- fuse_conn_put(fc);
+ fuse_conn_put(fm->fc);
return 0;
}
@@ -155,7 +156,7 @@
unsigned long arg)
{
struct fuse_file *ff = file->private_data;
- struct cuse_conn *cc = fc_to_cc(ff->fc);
+ struct cuse_conn *cc = fc_to_cc(ff->fm->fc);
unsigned int flags = 0;
if (cc->unrestricted_ioctl)
@@ -168,7 +169,7 @@
unsigned long arg)
{
struct fuse_file *ff = file->private_data;
- struct cuse_conn *cc = fc_to_cc(ff->fc);
+ struct cuse_conn *cc = fc_to_cc(ff->fm->fc);
unsigned int flags = FUSE_IOCTL_COMPAT;
if (cc->unrestricted_ioctl)
@@ -313,9 +314,10 @@
* required data structures for it. Please read the comment at the
* top of this file for high level overview.
*/
-static void cuse_process_init_reply(struct fuse_conn *fc,
+static void cuse_process_init_reply(struct fuse_mount *fm,
struct fuse_args *args, int error)
{
+ struct fuse_conn *fc = fm->fc;
struct cuse_init_args *ia = container_of(args, typeof(*ia), ap.args);
struct fuse_args_pages *ap = &ia->ap;
struct cuse_conn *cc = fc_to_cc(fc), *pos;
@@ -424,7 +426,7 @@
{
int rc;
struct page *page;
- struct fuse_conn *fc = &cc->fc;
+ struct fuse_mount *fm = &cc->fm;
struct cuse_init_args *ia;
struct fuse_args_pages *ap;
@@ -460,7 +462,7 @@
ia->desc.length = ap->args.out_args[1].size;
ap->args.end = cuse_process_init_reply;
- rc = fuse_simple_background(fc, &ap->args, GFP_KERNEL);
+ rc = fuse_simple_background(fm, &ap->args, GFP_KERNEL);
if (rc) {
kfree(ia);
err_free_page:
@@ -506,7 +508,8 @@
* Limit the cuse channel to requests that can
* be represented in file->f_cred->user_ns.
*/
- fuse_conn_init(&cc->fc, file->f_cred->user_ns, &fuse_dev_fiq_ops, NULL);
+ fuse_conn_init(&cc->fc, &cc->fm, file->f_cred->user_ns,
+ &fuse_dev_fiq_ops, NULL);
fud = fuse_dev_alloc_install(&cc->fc);
if (!fud) {
diff --git a/fs/fuse/dax.c b/fs/fuse/dax.c
new file mode 100644
index 0000000..ff99ab2
--- /dev/null
+++ b/fs/fuse/dax.c
@@ -0,0 +1,1365 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * dax: direct host memory access
+ * Copyright (C) 2020 Red Hat, Inc.
+ */
+
+#include "fuse_i.h"
+
+#include <linux/delay.h>
+#include <linux/dax.h>
+#include <linux/uio.h>
+#include <linux/pfn_t.h>
+#include <linux/iomap.h>
+#include <linux/interval_tree.h>
+
+/*
+ * Default memory range size. A power of 2 so it agrees with common FUSE_INIT
+ * map_alignment values 4KB and 64KB.
+ */
+#define FUSE_DAX_SHIFT 21
+#define FUSE_DAX_SZ (1 << FUSE_DAX_SHIFT)
+#define FUSE_DAX_PAGES (FUSE_DAX_SZ / PAGE_SIZE)
+
+/* Number of ranges reclaimer will try to free in one invocation */
+#define FUSE_DAX_RECLAIM_CHUNK (10)
+
+/*
+ * Dax memory reclaim threshold in percetage of total ranges. When free
+ * number of free ranges drops below this threshold, reclaim can trigger
+ * Default is 20%
+ */
+#define FUSE_DAX_RECLAIM_THRESHOLD (20)
+
+/** Translation information for file offsets to DAX window offsets */
+struct fuse_dax_mapping {
+ /* Pointer to inode where this memory range is mapped */
+ struct inode *inode;
+
+ /* Will connect in fcd->free_ranges to keep track of free memory */
+ struct list_head list;
+
+ /* For interval tree in file/inode */
+ struct interval_tree_node itn;
+
+ /* Will connect in fc->busy_ranges to keep track busy memory */
+ struct list_head busy_list;
+
+ /** Position in DAX window */
+ u64 window_offset;
+
+ /** Length of mapping, in bytes */
+ loff_t length;
+
+ /* Is this mapping read-only or read-write */
+ bool writable;
+
+ /* reference count when the mapping is used by dax iomap. */
+ refcount_t refcnt;
+};
+
+/* Per-inode dax map */
+struct fuse_inode_dax {
+ /* Semaphore to protect modifications to the dmap tree */
+ struct rw_semaphore sem;
+
+ /* Sorted rb tree of struct fuse_dax_mapping elements */
+ struct rb_root_cached tree;
+ unsigned long nr;
+};
+
+struct fuse_conn_dax {
+ /* DAX device */
+ struct dax_device *dev;
+
+ /* Lock protecting accessess to members of this structure */
+ spinlock_t lock;
+
+ /* List of memory ranges which are busy */
+ unsigned long nr_busy_ranges;
+ struct list_head busy_ranges;
+
+ /* Worker to free up memory ranges */
+ struct delayed_work free_work;
+
+ /* Wait queue for a dax range to become free */
+ wait_queue_head_t range_waitq;
+
+ /* DAX Window Free Ranges */
+ long nr_free_ranges;
+ struct list_head free_ranges;
+
+ unsigned long nr_ranges;
+};
+
+static inline struct fuse_dax_mapping *
+node_to_dmap(struct interval_tree_node *node)
+{
+ if (!node)
+ return NULL;
+
+ return container_of(node, struct fuse_dax_mapping, itn);
+}
+
+static struct fuse_dax_mapping *
+alloc_dax_mapping_reclaim(struct fuse_conn_dax *fcd, struct inode *inode);
+
+static void
+__kick_dmap_free_worker(struct fuse_conn_dax *fcd, unsigned long delay_ms)
+{
+ unsigned long free_threshold;
+
+ /* If number of free ranges are below threshold, start reclaim */
+ free_threshold = max_t(unsigned long, fcd->nr_ranges * FUSE_DAX_RECLAIM_THRESHOLD / 100,
+ 1);
+ if (fcd->nr_free_ranges < free_threshold)
+ queue_delayed_work(system_long_wq, &fcd->free_work,
+ msecs_to_jiffies(delay_ms));
+}
+
+static void kick_dmap_free_worker(struct fuse_conn_dax *fcd,
+ unsigned long delay_ms)
+{
+ spin_lock(&fcd->lock);
+ __kick_dmap_free_worker(fcd, delay_ms);
+ spin_unlock(&fcd->lock);
+}
+
+static struct fuse_dax_mapping *alloc_dax_mapping(struct fuse_conn_dax *fcd)
+{
+ struct fuse_dax_mapping *dmap;
+
+ spin_lock(&fcd->lock);
+ dmap = list_first_entry_or_null(&fcd->free_ranges,
+ struct fuse_dax_mapping, list);
+ if (dmap) {
+ list_del_init(&dmap->list);
+ WARN_ON(fcd->nr_free_ranges <= 0);
+ fcd->nr_free_ranges--;
+ }
+ spin_unlock(&fcd->lock);
+
+ kick_dmap_free_worker(fcd, 0);
+ return dmap;
+}
+
+/* This assumes fcd->lock is held */
+static void __dmap_remove_busy_list(struct fuse_conn_dax *fcd,
+ struct fuse_dax_mapping *dmap)
+{
+ list_del_init(&dmap->busy_list);
+ WARN_ON(fcd->nr_busy_ranges == 0);
+ fcd->nr_busy_ranges--;
+}
+
+static void dmap_remove_busy_list(struct fuse_conn_dax *fcd,
+ struct fuse_dax_mapping *dmap)
+{
+ spin_lock(&fcd->lock);
+ __dmap_remove_busy_list(fcd, dmap);
+ spin_unlock(&fcd->lock);
+}
+
+/* This assumes fcd->lock is held */
+static void __dmap_add_to_free_pool(struct fuse_conn_dax *fcd,
+ struct fuse_dax_mapping *dmap)
+{
+ list_add_tail(&dmap->list, &fcd->free_ranges);
+ fcd->nr_free_ranges++;
+ wake_up(&fcd->range_waitq);
+}
+
+static void dmap_add_to_free_pool(struct fuse_conn_dax *fcd,
+ struct fuse_dax_mapping *dmap)
+{
+ /* Return fuse_dax_mapping to free list */
+ spin_lock(&fcd->lock);
+ __dmap_add_to_free_pool(fcd, dmap);
+ spin_unlock(&fcd->lock);
+}
+
+static int fuse_setup_one_mapping(struct inode *inode, unsigned long start_idx,
+ struct fuse_dax_mapping *dmap, bool writable,
+ bool upgrade)
+{
+ struct fuse_mount *fm = get_fuse_mount(inode);
+ struct fuse_conn_dax *fcd = fm->fc->dax;
+ struct fuse_inode *fi = get_fuse_inode(inode);
+ struct fuse_setupmapping_in inarg;
+ loff_t offset = start_idx << FUSE_DAX_SHIFT;
+ FUSE_ARGS(args);
+ ssize_t err;
+
+ WARN_ON(fcd->nr_free_ranges < 0);
+
+ /* Ask fuse daemon to setup mapping */
+ memset(&inarg, 0, sizeof(inarg));
+ inarg.foffset = offset;
+ inarg.fh = -1;
+ inarg.moffset = dmap->window_offset;
+ inarg.len = FUSE_DAX_SZ;
+ inarg.flags |= FUSE_SETUPMAPPING_FLAG_READ;
+ if (writable)
+ inarg.flags |= FUSE_SETUPMAPPING_FLAG_WRITE;
+ args.opcode = FUSE_SETUPMAPPING;
+ args.nodeid = fi->nodeid;
+ args.in_numargs = 1;
+ args.in_args[0].size = sizeof(inarg);
+ args.in_args[0].value = &inarg;
+ err = fuse_simple_request(fm, &args);
+ if (err < 0)
+ return err;
+ dmap->writable = writable;
+ if (!upgrade) {
+ /*
+ * We don't take a refernce on inode. inode is valid right now
+ * and when inode is going away, cleanup logic should first
+ * cleanup dmap entries.
+ */
+ dmap->inode = inode;
+ dmap->itn.start = dmap->itn.last = start_idx;
+ /* Protected by fi->dax->sem */
+ interval_tree_insert(&dmap->itn, &fi->dax->tree);
+ fi->dax->nr++;
+ spin_lock(&fcd->lock);
+ list_add_tail(&dmap->busy_list, &fcd->busy_ranges);
+ fcd->nr_busy_ranges++;
+ spin_unlock(&fcd->lock);
+ }
+ return 0;
+}
+
+static int fuse_send_removemapping(struct inode *inode,
+ struct fuse_removemapping_in *inargp,
+ struct fuse_removemapping_one *remove_one)
+{
+ struct fuse_inode *fi = get_fuse_inode(inode);
+ struct fuse_mount *fm = get_fuse_mount(inode);
+ FUSE_ARGS(args);
+
+ args.opcode = FUSE_REMOVEMAPPING;
+ args.nodeid = fi->nodeid;
+ args.in_numargs = 2;
+ args.in_args[0].size = sizeof(*inargp);
+ args.in_args[0].value = inargp;
+ args.in_args[1].size = inargp->count * sizeof(*remove_one);
+ args.in_args[1].value = remove_one;
+ return fuse_simple_request(fm, &args);
+}
+
+static int dmap_removemapping_list(struct inode *inode, unsigned int num,
+ struct list_head *to_remove)
+{
+ struct fuse_removemapping_one *remove_one, *ptr;
+ struct fuse_removemapping_in inarg;
+ struct fuse_dax_mapping *dmap;
+ int ret, i = 0, nr_alloc;
+
+ nr_alloc = min_t(unsigned int, num, FUSE_REMOVEMAPPING_MAX_ENTRY);
+ remove_one = kmalloc_array(nr_alloc, sizeof(*remove_one), GFP_NOFS);
+ if (!remove_one)
+ return -ENOMEM;
+
+ ptr = remove_one;
+ list_for_each_entry(dmap, to_remove, list) {
+ ptr->moffset = dmap->window_offset;
+ ptr->len = dmap->length;
+ ptr++;
+ i++;
+ num--;
+ if (i >= nr_alloc || num == 0) {
+ memset(&inarg, 0, sizeof(inarg));
+ inarg.count = i;
+ ret = fuse_send_removemapping(inode, &inarg,
+ remove_one);
+ if (ret)
+ goto out;
+ ptr = remove_one;
+ i = 0;
+ }
+ }
+out:
+ kfree(remove_one);
+ return ret;
+}
+
+/*
+ * Cleanup dmap entry and add back to free list. This should be called with
+ * fcd->lock held.
+ */
+static void dmap_reinit_add_to_free_pool(struct fuse_conn_dax *fcd,
+ struct fuse_dax_mapping *dmap)
+{
+ pr_debug("fuse: freeing memory range start_idx=0x%lx end_idx=0x%lx window_offset=0x%llx length=0x%llx\n",
+ dmap->itn.start, dmap->itn.last, dmap->window_offset,
+ dmap->length);
+ __dmap_remove_busy_list(fcd, dmap);
+ dmap->inode = NULL;
+ dmap->itn.start = dmap->itn.last = 0;
+ __dmap_add_to_free_pool(fcd, dmap);
+}
+
+/*
+ * Free inode dmap entries whose range falls inside [start, end].
+ * Does not take any locks. At this point of time it should only be
+ * called from evict_inode() path where we know all dmap entries can be
+ * reclaimed.
+ */
+static void inode_reclaim_dmap_range(struct fuse_conn_dax *fcd,
+ struct inode *inode,
+ loff_t start, loff_t end)
+{
+ struct fuse_inode *fi = get_fuse_inode(inode);
+ struct fuse_dax_mapping *dmap, *n;
+ int err, num = 0;
+ LIST_HEAD(to_remove);
+ unsigned long start_idx = start >> FUSE_DAX_SHIFT;
+ unsigned long end_idx = end >> FUSE_DAX_SHIFT;
+ struct interval_tree_node *node;
+
+ while (1) {
+ node = interval_tree_iter_first(&fi->dax->tree, start_idx,
+ end_idx);
+ if (!node)
+ break;
+ dmap = node_to_dmap(node);
+ /* inode is going away. There should not be any users of dmap */
+ WARN_ON(refcount_read(&dmap->refcnt) > 1);
+ interval_tree_remove(&dmap->itn, &fi->dax->tree);
+ num++;
+ list_add(&dmap->list, &to_remove);
+ }
+
+ /* Nothing to remove */
+ if (list_empty(&to_remove))
+ return;
+
+ WARN_ON(fi->dax->nr < num);
+ fi->dax->nr -= num;
+ err = dmap_removemapping_list(inode, num, &to_remove);
+ if (err && err != -ENOTCONN) {
+ pr_warn("Failed to removemappings. start=0x%llx end=0x%llx\n",
+ start, end);
+ }
+ spin_lock(&fcd->lock);
+ list_for_each_entry_safe(dmap, n, &to_remove, list) {
+ list_del_init(&dmap->list);
+ dmap_reinit_add_to_free_pool(fcd, dmap);
+ }
+ spin_unlock(&fcd->lock);
+}
+
+static int dmap_removemapping_one(struct inode *inode,
+ struct fuse_dax_mapping *dmap)
+{
+ struct fuse_removemapping_one forget_one;
+ struct fuse_removemapping_in inarg;
+
+ memset(&inarg, 0, sizeof(inarg));
+ inarg.count = 1;
+ memset(&forget_one, 0, sizeof(forget_one));
+ forget_one.moffset = dmap->window_offset;
+ forget_one.len = dmap->length;
+
+ return fuse_send_removemapping(inode, &inarg, &forget_one);
+}
+
+/*
+ * It is called from evict_inode() and by that time inode is going away. So
+ * this function does not take any locks like fi->dax->sem for traversing
+ * that fuse inode interval tree. If that lock is taken then lock validator
+ * complains of deadlock situation w.r.t fs_reclaim lock.
+ */
+void fuse_dax_inode_cleanup(struct inode *inode)
+{
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_inode *fi = get_fuse_inode(inode);
+
+ /*
+ * fuse_evict_inode() has already called truncate_inode_pages_final()
+ * before we arrive here. So we should not have to worry about any
+ * pages/exception entries still associated with inode.
+ */
+ inode_reclaim_dmap_range(fc->dax, inode, 0, -1);
+ WARN_ON(fi->dax->nr);
+}
+
+static void fuse_fill_iomap_hole(struct iomap *iomap, loff_t length)
+{
+ iomap->addr = IOMAP_NULL_ADDR;
+ iomap->length = length;
+ iomap->type = IOMAP_HOLE;
+}
+
+static void fuse_fill_iomap(struct inode *inode, loff_t pos, loff_t length,
+ struct iomap *iomap, struct fuse_dax_mapping *dmap,
+ unsigned int flags)
+{
+ loff_t offset, len;
+ loff_t i_size = i_size_read(inode);
+
+ offset = pos - (dmap->itn.start << FUSE_DAX_SHIFT);
+ len = min(length, dmap->length - offset);
+
+ /* If length is beyond end of file, truncate further */
+ if (pos + len > i_size)
+ len = i_size - pos;
+
+ if (len > 0) {
+ iomap->addr = dmap->window_offset + offset;
+ iomap->length = len;
+ if (flags & IOMAP_FAULT)
+ iomap->length = ALIGN(len, PAGE_SIZE);
+ iomap->type = IOMAP_MAPPED;
+ /*
+ * increace refcnt so that reclaim code knows this dmap is in
+ * use. This assumes fi->dax->sem mutex is held either
+ * shared/exclusive.
+ */
+ refcount_inc(&dmap->refcnt);
+
+ /* iomap->private should be NULL */
+ WARN_ON_ONCE(iomap->private);
+ iomap->private = dmap;
+ } else {
+ /* Mapping beyond end of file is hole */
+ fuse_fill_iomap_hole(iomap, length);
+ }
+}
+
+static int fuse_setup_new_dax_mapping(struct inode *inode, loff_t pos,
+ loff_t length, unsigned int flags,
+ struct iomap *iomap)
+{
+ struct fuse_inode *fi = get_fuse_inode(inode);
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_conn_dax *fcd = fc->dax;
+ struct fuse_dax_mapping *dmap, *alloc_dmap = NULL;
+ int ret;
+ bool writable = flags & IOMAP_WRITE;
+ unsigned long start_idx = pos >> FUSE_DAX_SHIFT;
+ struct interval_tree_node *node;
+
+ /*
+ * Can't do inline reclaim in fault path. We call
+ * dax_layout_busy_page() before we free a range. And
+ * fuse_wait_dax_page() drops fi->i_mmap_sem lock and requires it.
+ * In fault path we enter with fi->i_mmap_sem held and can't drop
+ * it. Also in fault path we hold fi->i_mmap_sem shared and not
+ * exclusive, so that creates further issues with fuse_wait_dax_page().
+ * Hence return -EAGAIN and fuse_dax_fault() will wait for a memory
+ * range to become free and retry.
+ */
+ if (flags & IOMAP_FAULT) {
+ alloc_dmap = alloc_dax_mapping(fcd);
+ if (!alloc_dmap)
+ return -EAGAIN;
+ } else {
+ alloc_dmap = alloc_dax_mapping_reclaim(fcd, inode);
+ if (IS_ERR(alloc_dmap))
+ return PTR_ERR(alloc_dmap);
+ }
+
+ /* If we are here, we should have memory allocated */
+ if (WARN_ON(!alloc_dmap))
+ return -EIO;
+
+ /*
+ * Take write lock so that only one caller can try to setup mapping
+ * and other waits.
+ */
+ down_write(&fi->dax->sem);
+ /*
+ * We dropped lock. Check again if somebody else setup
+ * mapping already.
+ */
+ node = interval_tree_iter_first(&fi->dax->tree, start_idx, start_idx);
+ if (node) {
+ dmap = node_to_dmap(node);
+ fuse_fill_iomap(inode, pos, length, iomap, dmap, flags);
+ dmap_add_to_free_pool(fcd, alloc_dmap);
+ up_write(&fi->dax->sem);
+ return 0;
+ }
+
+ /* Setup one mapping */
+ ret = fuse_setup_one_mapping(inode, pos >> FUSE_DAX_SHIFT, alloc_dmap,
+ writable, false);
+ if (ret < 0) {
+ dmap_add_to_free_pool(fcd, alloc_dmap);
+ up_write(&fi->dax->sem);
+ return ret;
+ }
+ fuse_fill_iomap(inode, pos, length, iomap, alloc_dmap, flags);
+ up_write(&fi->dax->sem);
+ return 0;
+}
+
+static int fuse_upgrade_dax_mapping(struct inode *inode, loff_t pos,
+ loff_t length, unsigned int flags,
+ struct iomap *iomap)
+{
+ struct fuse_inode *fi = get_fuse_inode(inode);
+ struct fuse_dax_mapping *dmap;
+ int ret;
+ unsigned long idx = pos >> FUSE_DAX_SHIFT;
+ struct interval_tree_node *node;
+
+ /*
+ * Take exclusive lock so that only one caller can try to setup
+ * mapping and others wait.
+ */
+ down_write(&fi->dax->sem);
+ node = interval_tree_iter_first(&fi->dax->tree, idx, idx);
+
+ /* We are holding either inode lock or i_mmap_sem, and that should
+ * ensure that dmap can't be truncated. We are holding a reference
+ * on dmap and that should make sure it can't be reclaimed. So dmap
+ * should still be there in tree despite the fact we dropped and
+ * re-acquired the fi->dax->sem lock.
+ */
+ ret = -EIO;
+ if (WARN_ON(!node))
+ goto out_err;
+
+ dmap = node_to_dmap(node);
+
+ /* We took an extra reference on dmap to make sure its not reclaimd.
+ * Now we hold fi->dax->sem lock and that reference is not needed
+ * anymore. Drop it.
+ */
+ if (refcount_dec_and_test(&dmap->refcnt)) {
+ /* refcount should not hit 0. This object only goes
+ * away when fuse connection goes away
+ */
+ WARN_ON_ONCE(1);
+ }
+
+ /* Maybe another thread already upgraded mapping while we were not
+ * holding lock.
+ */
+ if (dmap->writable) {
+ ret = 0;
+ goto out_fill_iomap;
+ }
+
+ ret = fuse_setup_one_mapping(inode, pos >> FUSE_DAX_SHIFT, dmap, true,
+ true);
+ if (ret < 0)
+ goto out_err;
+out_fill_iomap:
+ fuse_fill_iomap(inode, pos, length, iomap, dmap, flags);
+out_err:
+ up_write(&fi->dax->sem);
+ return ret;
+}
+
+/* This is just for DAX and the mapping is ephemeral, do not use it for other
+ * purposes since there is no block device with a permanent mapping.
+ */
+static int fuse_iomap_begin(struct inode *inode, loff_t pos, loff_t length,
+ unsigned int flags, struct iomap *iomap,
+ struct iomap *srcmap)
+{
+ struct fuse_inode *fi = get_fuse_inode(inode);
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_dax_mapping *dmap;
+ bool writable = flags & IOMAP_WRITE;
+ unsigned long start_idx = pos >> FUSE_DAX_SHIFT;
+ struct interval_tree_node *node;
+
+ /* We don't support FIEMAP */
+ if (WARN_ON(flags & IOMAP_REPORT))
+ return -EIO;
+
+ iomap->offset = pos;
+ iomap->flags = 0;
+ iomap->bdev = NULL;
+ iomap->dax_dev = fc->dax->dev;
+
+ /*
+ * Both read/write and mmap path can race here. So we need something
+ * to make sure if we are setting up mapping, then other path waits
+ *
+ * For now, use a semaphore for this. It probably needs to be
+ * optimized later.
+ */
+ down_read(&fi->dax->sem);
+ node = interval_tree_iter_first(&fi->dax->tree, start_idx, start_idx);
+ if (node) {
+ dmap = node_to_dmap(node);
+ if (writable && !dmap->writable) {
+ /* Upgrade read-only mapping to read-write. This will
+ * require exclusive fi->dax->sem lock as we don't want
+ * two threads to be trying to this simultaneously
+ * for same dmap. So drop shared lock and acquire
+ * exclusive lock.
+ *
+ * Before dropping fi->dax->sem lock, take reference
+ * on dmap so that its not freed by range reclaim.
+ */
+ refcount_inc(&dmap->refcnt);
+ up_read(&fi->dax->sem);
+ pr_debug("%s: Upgrading mapping at offset 0x%llx length 0x%llx\n",
+ __func__, pos, length);
+ return fuse_upgrade_dax_mapping(inode, pos, length,
+ flags, iomap);
+ } else {
+ fuse_fill_iomap(inode, pos, length, iomap, dmap, flags);
+ up_read(&fi->dax->sem);
+ return 0;
+ }
+ } else {
+ up_read(&fi->dax->sem);
+ pr_debug("%s: no mapping at offset 0x%llx length 0x%llx\n",
+ __func__, pos, length);
+ if (pos >= i_size_read(inode))
+ goto iomap_hole;
+
+ return fuse_setup_new_dax_mapping(inode, pos, length, flags,
+ iomap);
+ }
+
+ /*
+ * If read beyond end of file happnes, fs code seems to return
+ * it as hole
+ */
+iomap_hole:
+ fuse_fill_iomap_hole(iomap, length);
+ pr_debug("%s returning hole mapping. pos=0x%llx length_asked=0x%llx length_returned=0x%llx\n",
+ __func__, pos, length, iomap->length);
+ return 0;
+}
+
+static int fuse_iomap_end(struct inode *inode, loff_t pos, loff_t length,
+ ssize_t written, unsigned int flags,
+ struct iomap *iomap)
+{
+ struct fuse_dax_mapping *dmap = iomap->private;
+
+ if (dmap) {
+ if (refcount_dec_and_test(&dmap->refcnt)) {
+ /* refcount should not hit 0. This object only goes
+ * away when fuse connection goes away
+ */
+ WARN_ON_ONCE(1);
+ }
+ }
+
+ /* DAX writes beyond end-of-file aren't handled using iomap, so the
+ * file size is unchanged and there is nothing to do here.
+ */
+ return 0;
+}
+
+static const struct iomap_ops fuse_iomap_ops = {
+ .iomap_begin = fuse_iomap_begin,
+ .iomap_end = fuse_iomap_end,
+};
+
+static void fuse_wait_dax_page(struct inode *inode)
+{
+ struct fuse_inode *fi = get_fuse_inode(inode);
+
+ up_write(&fi->i_mmap_sem);
+ schedule();
+ down_write(&fi->i_mmap_sem);
+}
+
+/* Should be called with fi->i_mmap_sem lock held exclusively */
+static int __fuse_dax_break_layouts(struct inode *inode, bool *retry,
+ loff_t start, loff_t end)
+{
+ struct page *page;
+
+ page = dax_layout_busy_page_range(inode->i_mapping, start, end);
+ if (!page)
+ return 0;
+
+ *retry = true;
+ return ___wait_var_event(&page->_refcount,
+ atomic_read(&page->_refcount) == 1, TASK_INTERRUPTIBLE,
+ 0, 0, fuse_wait_dax_page(inode));
+}
+
+/* dmap_end == 0 leads to unmapping of whole file */
+int fuse_dax_break_layouts(struct inode *inode, u64 dmap_start,
+ u64 dmap_end)
+{
+ bool retry;
+ int ret;
+
+ do {
+ retry = false;
+ ret = __fuse_dax_break_layouts(inode, &retry, dmap_start,
+ dmap_end);
+ } while (ret == 0 && retry);
+
+ return ret;
+}
+
+ssize_t fuse_dax_read_iter(struct kiocb *iocb, struct iov_iter *to)
+{
+ struct inode *inode = file_inode(iocb->ki_filp);
+ ssize_t ret;
+
+ if (iocb->ki_flags & IOCB_NOWAIT) {
+ if (!inode_trylock_shared(inode))
+ return -EAGAIN;
+ } else {
+ inode_lock_shared(inode);
+ }
+
+ ret = dax_iomap_rw(iocb, to, &fuse_iomap_ops);
+ inode_unlock_shared(inode);
+
+ /* TODO file_accessed(iocb->f_filp) */
+ return ret;
+}
+
+static bool file_extending_write(struct kiocb *iocb, struct iov_iter *from)
+{
+ struct inode *inode = file_inode(iocb->ki_filp);
+
+ return (iov_iter_rw(from) == WRITE &&
+ ((iocb->ki_pos) >= i_size_read(inode) ||
+ (iocb->ki_pos + iov_iter_count(from) > i_size_read(inode))));
+}
+
+static ssize_t fuse_dax_direct_write(struct kiocb *iocb, struct iov_iter *from)
+{
+ struct inode *inode = file_inode(iocb->ki_filp);
+ struct fuse_io_priv io = FUSE_IO_PRIV_SYNC(iocb);
+ ssize_t ret;
+
+ ret = fuse_direct_io(&io, from, &iocb->ki_pos, FUSE_DIO_WRITE);
+ if (ret < 0)
+ return ret;
+
+ fuse_invalidate_attr(inode);
+ fuse_write_update_size(inode, iocb->ki_pos);
+ return ret;
+}
+
+ssize_t fuse_dax_write_iter(struct kiocb *iocb, struct iov_iter *from)
+{
+ struct inode *inode = file_inode(iocb->ki_filp);
+ ssize_t ret;
+
+ if (iocb->ki_flags & IOCB_NOWAIT) {
+ if (!inode_trylock(inode))
+ return -EAGAIN;
+ } else {
+ inode_lock(inode);
+ }
+
+ ret = generic_write_checks(iocb, from);
+ if (ret <= 0)
+ goto out;
+
+ ret = file_remove_privs(iocb->ki_filp);
+ if (ret)
+ goto out;
+ /* TODO file_update_time() but we don't want metadata I/O */
+
+ /* Do not use dax for file extending writes as write and on
+ * disk i_size increase are not atomic otherwise.
+ */
+ if (file_extending_write(iocb, from))
+ ret = fuse_dax_direct_write(iocb, from);
+ else
+ ret = dax_iomap_rw(iocb, from, &fuse_iomap_ops);
+
+out:
+ inode_unlock(inode);
+
+ if (ret > 0)
+ ret = generic_write_sync(iocb, ret);
+ return ret;
+}
+
+static int fuse_dax_writepages(struct address_space *mapping,
+ struct writeback_control *wbc)
+{
+
+ struct inode *inode = mapping->host;
+ struct fuse_conn *fc = get_fuse_conn(inode);
+
+ return dax_writeback_mapping_range(mapping, fc->dax->dev, wbc);
+}
+
+static vm_fault_t __fuse_dax_fault(struct vm_fault *vmf,
+ enum page_entry_size pe_size, bool write)
+{
+ vm_fault_t ret;
+ struct inode *inode = file_inode(vmf->vma->vm_file);
+ struct super_block *sb = inode->i_sb;
+ pfn_t pfn;
+ int error = 0;
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_conn_dax *fcd = fc->dax;
+ bool retry = false;
+
+ if (write)
+ sb_start_pagefault(sb);
+retry:
+ if (retry && !(fcd->nr_free_ranges > 0))
+ wait_event(fcd->range_waitq, (fcd->nr_free_ranges > 0));
+
+ /*
+ * We need to serialize against not only truncate but also against
+ * fuse dax memory range reclaim. While a range is being reclaimed,
+ * we do not want any read/write/mmap to make progress and try
+ * to populate page cache or access memory we are trying to free.
+ */
+ down_read(&get_fuse_inode(inode)->i_mmap_sem);
+ ret = dax_iomap_fault(vmf, pe_size, &pfn, &error, &fuse_iomap_ops);
+ if ((ret & VM_FAULT_ERROR) && error == -EAGAIN) {
+ error = 0;
+ retry = true;
+ up_read(&get_fuse_inode(inode)->i_mmap_sem);
+ goto retry;
+ }
+
+ if (ret & VM_FAULT_NEEDDSYNC)
+ ret = dax_finish_sync_fault(vmf, pe_size, pfn);
+ up_read(&get_fuse_inode(inode)->i_mmap_sem);
+
+ if (write)
+ sb_end_pagefault(sb);
+
+ return ret;
+}
+
+static vm_fault_t fuse_dax_fault(struct vm_fault *vmf)
+{
+ return __fuse_dax_fault(vmf, PE_SIZE_PTE,
+ vmf->flags & FAULT_FLAG_WRITE);
+}
+
+static vm_fault_t fuse_dax_huge_fault(struct vm_fault *vmf,
+ enum page_entry_size pe_size)
+{
+ return __fuse_dax_fault(vmf, pe_size, vmf->flags & FAULT_FLAG_WRITE);
+}
+
+static vm_fault_t fuse_dax_page_mkwrite(struct vm_fault *vmf)
+{
+ return __fuse_dax_fault(vmf, PE_SIZE_PTE, true);
+}
+
+static vm_fault_t fuse_dax_pfn_mkwrite(struct vm_fault *vmf)
+{
+ return __fuse_dax_fault(vmf, PE_SIZE_PTE, true);
+}
+
+static const struct vm_operations_struct fuse_dax_vm_ops = {
+ .fault = fuse_dax_fault,
+ .huge_fault = fuse_dax_huge_fault,
+ .page_mkwrite = fuse_dax_page_mkwrite,
+ .pfn_mkwrite = fuse_dax_pfn_mkwrite,
+};
+
+int fuse_dax_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ file_accessed(file);
+ vma->vm_ops = &fuse_dax_vm_ops;
+ vma->vm_flags |= VM_MIXEDMAP | VM_HUGEPAGE;
+ return 0;
+}
+
+static int dmap_writeback_invalidate(struct inode *inode,
+ struct fuse_dax_mapping *dmap)
+{
+ int ret;
+ loff_t start_pos = dmap->itn.start << FUSE_DAX_SHIFT;
+ loff_t end_pos = (start_pos + FUSE_DAX_SZ - 1);
+
+ ret = filemap_fdatawrite_range(inode->i_mapping, start_pos, end_pos);
+ if (ret) {
+ pr_debug("fuse: filemap_fdatawrite_range() failed. err=%d start_pos=0x%llx, end_pos=0x%llx\n",
+ ret, start_pos, end_pos);
+ return ret;
+ }
+
+ ret = invalidate_inode_pages2_range(inode->i_mapping,
+ start_pos >> PAGE_SHIFT,
+ end_pos >> PAGE_SHIFT);
+ if (ret)
+ pr_debug("fuse: invalidate_inode_pages2_range() failed err=%d\n",
+ ret);
+
+ return ret;
+}
+
+static int reclaim_one_dmap_locked(struct inode *inode,
+ struct fuse_dax_mapping *dmap)
+{
+ int ret;
+ struct fuse_inode *fi = get_fuse_inode(inode);
+
+ /*
+ * igrab() was done to make sure inode won't go under us, and this
+ * further avoids the race with evict().
+ */
+ ret = dmap_writeback_invalidate(inode, dmap);
+ if (ret)
+ return ret;
+
+ /* Remove dax mapping from inode interval tree now */
+ interval_tree_remove(&dmap->itn, &fi->dax->tree);
+ fi->dax->nr--;
+
+ /* It is possible that umount/shutdown has killed the fuse connection
+ * and worker thread is trying to reclaim memory in parallel. Don't
+ * warn in that case.
+ */
+ ret = dmap_removemapping_one(inode, dmap);
+ if (ret && ret != -ENOTCONN) {
+ pr_warn("Failed to remove mapping. offset=0x%llx len=0x%llx ret=%d\n",
+ dmap->window_offset, dmap->length, ret);
+ }
+ return 0;
+}
+
+/* Find first mapped dmap for an inode and return file offset. Caller needs
+ * to hold fi->dax->sem lock either shared or exclusive.
+ */
+static struct fuse_dax_mapping *inode_lookup_first_dmap(struct inode *inode)
+{
+ struct fuse_inode *fi = get_fuse_inode(inode);
+ struct fuse_dax_mapping *dmap;
+ struct interval_tree_node *node;
+
+ for (node = interval_tree_iter_first(&fi->dax->tree, 0, -1); node;
+ node = interval_tree_iter_next(node, 0, -1)) {
+ dmap = node_to_dmap(node);
+ /* still in use. */
+ if (refcount_read(&dmap->refcnt) > 1)
+ continue;
+
+ return dmap;
+ }
+
+ return NULL;
+}
+
+/*
+ * Find first mapping in the tree and free it and return it. Do not add
+ * it back to free pool.
+ */
+static struct fuse_dax_mapping *
+inode_inline_reclaim_one_dmap(struct fuse_conn_dax *fcd, struct inode *inode,
+ bool *retry)
+{
+ struct fuse_inode *fi = get_fuse_inode(inode);
+ struct fuse_dax_mapping *dmap;
+ u64 dmap_start, dmap_end;
+ unsigned long start_idx;
+ int ret;
+ struct interval_tree_node *node;
+
+ down_write(&fi->i_mmap_sem);
+
+ /* Lookup a dmap and corresponding file offset to reclaim. */
+ down_read(&fi->dax->sem);
+ dmap = inode_lookup_first_dmap(inode);
+ if (dmap) {
+ start_idx = dmap->itn.start;
+ dmap_start = start_idx << FUSE_DAX_SHIFT;
+ dmap_end = dmap_start + FUSE_DAX_SZ - 1;
+ }
+ up_read(&fi->dax->sem);
+
+ if (!dmap)
+ goto out_mmap_sem;
+ /*
+ * Make sure there are no references to inode pages using
+ * get_user_pages()
+ */
+ ret = fuse_dax_break_layouts(inode, dmap_start, dmap_end);
+ if (ret) {
+ pr_debug("fuse: fuse_dax_break_layouts() failed. err=%d\n",
+ ret);
+ dmap = ERR_PTR(ret);
+ goto out_mmap_sem;
+ }
+
+ down_write(&fi->dax->sem);
+ node = interval_tree_iter_first(&fi->dax->tree, start_idx, start_idx);
+ /* Range already got reclaimed by somebody else */
+ if (!node) {
+ if (retry)
+ *retry = true;
+ goto out_write_dmap_sem;
+ }
+
+ dmap = node_to_dmap(node);
+ /* still in use. */
+ if (refcount_read(&dmap->refcnt) > 1) {
+ dmap = NULL;
+ if (retry)
+ *retry = true;
+ goto out_write_dmap_sem;
+ }
+
+ ret = reclaim_one_dmap_locked(inode, dmap);
+ if (ret < 0) {
+ dmap = ERR_PTR(ret);
+ goto out_write_dmap_sem;
+ }
+
+ /* Clean up dmap. Do not add back to free list */
+ dmap_remove_busy_list(fcd, dmap);
+ dmap->inode = NULL;
+ dmap->itn.start = dmap->itn.last = 0;
+
+ pr_debug("fuse: %s: inline reclaimed memory range. inode=%p, window_offset=0x%llx, length=0x%llx\n",
+ __func__, inode, dmap->window_offset, dmap->length);
+
+out_write_dmap_sem:
+ up_write(&fi->dax->sem);
+out_mmap_sem:
+ up_write(&fi->i_mmap_sem);
+ return dmap;
+}
+
+static struct fuse_dax_mapping *
+alloc_dax_mapping_reclaim(struct fuse_conn_dax *fcd, struct inode *inode)
+{
+ struct fuse_dax_mapping *dmap;
+ struct fuse_inode *fi = get_fuse_inode(inode);
+
+ while (1) {
+ bool retry = false;
+
+ dmap = alloc_dax_mapping(fcd);
+ if (dmap)
+ return dmap;
+
+ dmap = inode_inline_reclaim_one_dmap(fcd, inode, &retry);
+ /*
+ * Either we got a mapping or it is an error, return in both
+ * the cases.
+ */
+ if (dmap)
+ return dmap;
+
+ /* If we could not reclaim a mapping because it
+ * had a reference or some other temporary failure,
+ * Try again. We want to give up inline reclaim only
+ * if there is no range assigned to this node. Otherwise
+ * if a deadlock is possible if we sleep with fi->i_mmap_sem
+ * held and worker to free memory can't make progress due
+ * to unavailability of fi->i_mmap_sem lock. So sleep
+ * only if fi->dax->nr=0
+ */
+ if (retry)
+ continue;
+ /*
+ * There are no mappings which can be reclaimed. Wait for one.
+ * We are not holding fi->dax->sem. So it is possible
+ * that range gets added now. But as we are not holding
+ * fi->i_mmap_sem, worker should still be able to free up
+ * a range and wake us up.
+ */
+ if (!fi->dax->nr && !(fcd->nr_free_ranges > 0)) {
+ if (wait_event_killable_exclusive(fcd->range_waitq,
+ (fcd->nr_free_ranges > 0))) {
+ return ERR_PTR(-EINTR);
+ }
+ }
+ }
+}
+
+static int lookup_and_reclaim_dmap_locked(struct fuse_conn_dax *fcd,
+ struct inode *inode,
+ unsigned long start_idx)
+{
+ int ret;
+ struct fuse_inode *fi = get_fuse_inode(inode);
+ struct fuse_dax_mapping *dmap;
+ struct interval_tree_node *node;
+
+ /* Find fuse dax mapping at file offset inode. */
+ node = interval_tree_iter_first(&fi->dax->tree, start_idx, start_idx);
+
+ /* Range already got cleaned up by somebody else */
+ if (!node)
+ return 0;
+ dmap = node_to_dmap(node);
+
+ /* still in use. */
+ if (refcount_read(&dmap->refcnt) > 1)
+ return 0;
+
+ ret = reclaim_one_dmap_locked(inode, dmap);
+ if (ret < 0)
+ return ret;
+
+ /* Cleanup dmap entry and add back to free list */
+ spin_lock(&fcd->lock);
+ dmap_reinit_add_to_free_pool(fcd, dmap);
+ spin_unlock(&fcd->lock);
+ return ret;
+}
+
+/*
+ * Free a range of memory.
+ * Locking:
+ * 1. Take fi->i_mmap_sem to block dax faults.
+ * 2. Take fi->dax->sem to protect interval tree and also to make sure
+ * read/write can not reuse a dmap which we might be freeing.
+ */
+static int lookup_and_reclaim_dmap(struct fuse_conn_dax *fcd,
+ struct inode *inode,
+ unsigned long start_idx,
+ unsigned long end_idx)
+{
+ int ret;
+ struct fuse_inode *fi = get_fuse_inode(inode);
+ loff_t dmap_start = start_idx << FUSE_DAX_SHIFT;
+ loff_t dmap_end = (dmap_start + FUSE_DAX_SZ) - 1;
+
+ down_write(&fi->i_mmap_sem);
+ ret = fuse_dax_break_layouts(inode, dmap_start, dmap_end);
+ if (ret) {
+ pr_debug("virtio_fs: fuse_dax_break_layouts() failed. err=%d\n",
+ ret);
+ goto out_mmap_sem;
+ }
+
+ down_write(&fi->dax->sem);
+ ret = lookup_and_reclaim_dmap_locked(fcd, inode, start_idx);
+ up_write(&fi->dax->sem);
+out_mmap_sem:
+ up_write(&fi->i_mmap_sem);
+ return ret;
+}
+
+static int try_to_free_dmap_chunks(struct fuse_conn_dax *fcd,
+ unsigned long nr_to_free)
+{
+ struct fuse_dax_mapping *dmap, *pos, *temp;
+ int ret, nr_freed = 0;
+ unsigned long start_idx = 0, end_idx = 0;
+ struct inode *inode = NULL;
+
+ /* Pick first busy range and free it for now*/
+ while (1) {
+ if (nr_freed >= nr_to_free)
+ break;
+
+ dmap = NULL;
+ spin_lock(&fcd->lock);
+
+ if (!fcd->nr_busy_ranges) {
+ spin_unlock(&fcd->lock);
+ return 0;
+ }
+
+ list_for_each_entry_safe(pos, temp, &fcd->busy_ranges,
+ busy_list) {
+ /* skip this range if it's in use. */
+ if (refcount_read(&pos->refcnt) > 1)
+ continue;
+
+ inode = igrab(pos->inode);
+ /*
+ * This inode is going away. That will free
+ * up all the ranges anyway, continue to
+ * next range.
+ */
+ if (!inode)
+ continue;
+ /*
+ * Take this element off list and add it tail. If
+ * this element can't be freed, it will help with
+ * selecting new element in next iteration of loop.
+ */
+ dmap = pos;
+ list_move_tail(&dmap->busy_list, &fcd->busy_ranges);
+ start_idx = end_idx = dmap->itn.start;
+ break;
+ }
+ spin_unlock(&fcd->lock);
+ if (!dmap)
+ return 0;
+
+ ret = lookup_and_reclaim_dmap(fcd, inode, start_idx, end_idx);
+ iput(inode);
+ if (ret)
+ return ret;
+ nr_freed++;
+ }
+ return 0;
+}
+
+static void fuse_dax_free_mem_worker(struct work_struct *work)
+{
+ int ret;
+ struct fuse_conn_dax *fcd = container_of(work, struct fuse_conn_dax,
+ free_work.work);
+ ret = try_to_free_dmap_chunks(fcd, FUSE_DAX_RECLAIM_CHUNK);
+ if (ret) {
+ pr_debug("fuse: try_to_free_dmap_chunks() failed with err=%d\n",
+ ret);
+ }
+
+ /* If number of free ranges are still below threhold, requeue */
+ kick_dmap_free_worker(fcd, 1);
+}
+
+static void fuse_free_dax_mem_ranges(struct list_head *mem_list)
+{
+ struct fuse_dax_mapping *range, *temp;
+
+ /* Free All allocated elements */
+ list_for_each_entry_safe(range, temp, mem_list, list) {
+ list_del(&range->list);
+ if (!list_empty(&range->busy_list))
+ list_del(&range->busy_list);
+ kfree(range);
+ }
+}
+
+void fuse_dax_conn_free(struct fuse_conn *fc)
+{
+ if (fc->dax) {
+ fuse_free_dax_mem_ranges(&fc->dax->free_ranges);
+ kfree(fc->dax);
+ }
+}
+
+static int fuse_dax_mem_range_init(struct fuse_conn_dax *fcd)
+{
+ long nr_pages, nr_ranges;
+ void *kaddr;
+ pfn_t pfn;
+ struct fuse_dax_mapping *range;
+ int ret, id;
+ size_t dax_size = -1;
+ unsigned long i;
+
+ init_waitqueue_head(&fcd->range_waitq);
+ INIT_LIST_HEAD(&fcd->free_ranges);
+ INIT_LIST_HEAD(&fcd->busy_ranges);
+ INIT_DELAYED_WORK(&fcd->free_work, fuse_dax_free_mem_worker);
+
+ id = dax_read_lock();
+ nr_pages = dax_direct_access(fcd->dev, 0, PHYS_PFN(dax_size), &kaddr,
+ &pfn);
+ dax_read_unlock(id);
+ if (nr_pages < 0) {
+ pr_debug("dax_direct_access() returned %ld\n", nr_pages);
+ return nr_pages;
+ }
+
+ nr_ranges = nr_pages/FUSE_DAX_PAGES;
+ pr_debug("%s: dax mapped %ld pages. nr_ranges=%ld\n",
+ __func__, nr_pages, nr_ranges);
+
+ for (i = 0; i < nr_ranges; i++) {
+ range = kzalloc(sizeof(struct fuse_dax_mapping), GFP_KERNEL);
+ ret = -ENOMEM;
+ if (!range)
+ goto out_err;
+
+ /* TODO: This offset only works if virtio-fs driver is not
+ * having some memory hidden at the beginning. This needs
+ * better handling
+ */
+ range->window_offset = i * FUSE_DAX_SZ;
+ range->length = FUSE_DAX_SZ;
+ INIT_LIST_HEAD(&range->busy_list);
+ refcount_set(&range->refcnt, 1);
+ list_add_tail(&range->list, &fcd->free_ranges);
+ }
+
+ fcd->nr_free_ranges = nr_ranges;
+ fcd->nr_ranges = nr_ranges;
+ return 0;
+out_err:
+ /* Free All allocated elements */
+ fuse_free_dax_mem_ranges(&fcd->free_ranges);
+ return ret;
+}
+
+int fuse_dax_conn_alloc(struct fuse_conn *fc, struct dax_device *dax_dev)
+{
+ struct fuse_conn_dax *fcd;
+ int err;
+
+ if (!dax_dev)
+ return 0;
+
+ fcd = kzalloc(sizeof(*fcd), GFP_KERNEL);
+ if (!fcd)
+ return -ENOMEM;
+
+ spin_lock_init(&fcd->lock);
+ fcd->dev = dax_dev;
+ err = fuse_dax_mem_range_init(fcd);
+ if (err) {
+ kfree(fcd);
+ return err;
+ }
+
+ fc->dax = fcd;
+ return 0;
+}
+
+bool fuse_dax_inode_alloc(struct super_block *sb, struct fuse_inode *fi)
+{
+ struct fuse_conn *fc = get_fuse_conn_super(sb);
+
+ fi->dax = NULL;
+ if (fc->dax) {
+ fi->dax = kzalloc(sizeof(*fi->dax), GFP_KERNEL_ACCOUNT);
+ if (!fi->dax)
+ return false;
+
+ init_rwsem(&fi->dax->sem);
+ fi->dax->tree = RB_ROOT_CACHED;
+ }
+
+ return true;
+}
+
+static const struct address_space_operations fuse_dax_file_aops = {
+ .writepages = fuse_dax_writepages,
+ .direct_IO = noop_direct_IO,
+ .set_page_dirty = noop_set_page_dirty,
+ .invalidatepage = noop_invalidatepage,
+};
+
+void fuse_dax_inode_init(struct inode *inode)
+{
+ struct fuse_conn *fc = get_fuse_conn(inode);
+
+ if (!fc->dax)
+ return;
+
+ inode->i_flags |= S_DAX;
+ inode->i_data.a_ops = &fuse_dax_file_aops;
+}
+
+bool fuse_dax_check_alignment(struct fuse_conn *fc, unsigned int map_alignment)
+{
+ if (fc->dax && (map_alignment > FUSE_DAX_SHIFT)) {
+ pr_warn("FUSE: map_alignment %u incompatible with dax mem range size %u\n",
+ map_alignment, FUSE_DAX_SZ);
+ return false;
+ }
+ return true;
+}
+
+void fuse_dax_cancel_work(struct fuse_conn *fc)
+{
+ struct fuse_conn_dax *fcd = fc->dax;
+
+ if (fcd)
+ cancel_delayed_work_sync(&fcd->free_work);
+
+}
+EXPORT_SYMBOL_GPL(fuse_dax_cancel_work);
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 02b3c36..588f8d1 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -40,20 +40,21 @@
return READ_ONCE(file->private_data);
}
-static void fuse_request_init(struct fuse_req *req)
+static void fuse_request_init(struct fuse_mount *fm, struct fuse_req *req)
{
INIT_LIST_HEAD(&req->list);
INIT_LIST_HEAD(&req->intr_entry);
init_waitqueue_head(&req->waitq);
refcount_set(&req->count, 1);
__set_bit(FR_PENDING, &req->flags);
+ req->fm = fm;
}
-static struct fuse_req *fuse_request_alloc(gfp_t flags)
+static struct fuse_req *fuse_request_alloc(struct fuse_mount *fm, gfp_t flags)
{
struct fuse_req *req = kmem_cache_zalloc(fuse_req_cachep, flags);
if (req)
- fuse_request_init(req);
+ fuse_request_init(fm, req);
return req;
}
@@ -100,10 +101,11 @@
}
}
-static void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req);
+static void fuse_put_request(struct fuse_req *req);
-static struct fuse_req *fuse_get_req(struct fuse_conn *fc, bool for_background)
+static struct fuse_req *fuse_get_req(struct fuse_mount *fm, bool for_background)
{
+ struct fuse_conn *fc = fm->fc;
struct fuse_req *req;
int err;
atomic_inc(&fc->num_waiting);
@@ -125,7 +127,7 @@
if (fc->conn_error)
goto out;
- req = fuse_request_alloc(GFP_KERNEL);
+ req = fuse_request_alloc(fm, GFP_KERNEL);
err = -ENOMEM;
if (!req) {
if (for_background)
@@ -143,7 +145,7 @@
if (unlikely(req->in.h.uid == ((uid_t)-1) ||
req->in.h.gid == ((gid_t)-1))) {
- fuse_put_request(fc, req);
+ fuse_put_request(req);
return ERR_PTR(-EOVERFLOW);
}
return req;
@@ -153,8 +155,10 @@
return ERR_PTR(err);
}
-static void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req)
+static void fuse_put_request(struct fuse_req *req)
{
+ struct fuse_conn *fc = req->fm->fc;
+
if (refcount_dec_and_test(&req->count)) {
if (test_bit(FR_BACKGROUND, &req->flags)) {
/*
@@ -273,8 +277,10 @@
* the 'end' callback is called if given, else the reference to the
* request is released
*/
-void fuse_request_end(struct fuse_conn *fc, struct fuse_req *req)
+void fuse_request_end(struct fuse_req *req)
{
+ struct fuse_mount *fm = req->fm;
+ struct fuse_conn *fc = fm->fc;
struct fuse_iqueue *fiq = &fc->iq;
if (test_and_set_bit(FR_FINISHED, &req->flags))
@@ -309,9 +315,9 @@
wake_up(&fc->blocked_waitq);
}
- if (fc->num_background == fc->congestion_threshold && fc->sb) {
- clear_bdi_congested(fc->sb->s_bdi, BLK_RW_SYNC);
- clear_bdi_congested(fc->sb->s_bdi, BLK_RW_ASYNC);
+ if (fc->num_background == fc->congestion_threshold && fm->sb) {
+ clear_bdi_congested(fm->sb->s_bdi, BLK_RW_SYNC);
+ clear_bdi_congested(fm->sb->s_bdi, BLK_RW_ASYNC);
}
fc->num_background--;
fc->active_background--;
@@ -323,14 +329,16 @@
}
if (test_bit(FR_ASYNC, &req->flags))
- req->args->end(fc, req->args, req->out.h.error);
+ req->args->end(fm, req->args, req->out.h.error);
put_request:
- fuse_put_request(fc, req);
+ fuse_put_request(req);
}
EXPORT_SYMBOL_GPL(fuse_request_end);
-static int queue_interrupt(struct fuse_iqueue *fiq, struct fuse_req *req)
+static int queue_interrupt(struct fuse_req *req)
{
+ struct fuse_iqueue *fiq = &req->fm->fc->iq;
+
spin_lock(&fiq->lock);
/* Check for we've sent request to interrupt this req */
if (unlikely(!test_bit(FR_INTERRUPTED, &req->flags))) {
@@ -357,8 +365,9 @@
return 0;
}
-static void request_wait_answer(struct fuse_conn *fc, struct fuse_req *req)
+static void request_wait_answer(struct fuse_req *req)
{
+ struct fuse_conn *fc = req->fm->fc;
struct fuse_iqueue *fiq = &fc->iq;
int err;
@@ -373,7 +382,7 @@
/* matches barrier in fuse_dev_do_read() */
smp_mb__after_atomic();
if (test_bit(FR_SENT, &req->flags))
- queue_interrupt(fiq, req);
+ queue_interrupt(req);
}
if (!test_bit(FR_FORCE, &req->flags)) {
@@ -402,9 +411,9 @@
wait_event(req->waitq, test_bit(FR_FINISHED, &req->flags));
}
-static void __fuse_request_send(struct fuse_conn *fc, struct fuse_req *req)
+static void __fuse_request_send(struct fuse_req *req)
{
- struct fuse_iqueue *fiq = &fc->iq;
+ struct fuse_iqueue *fiq = &req->fm->fc->iq;
BUG_ON(test_bit(FR_BACKGROUND, &req->flags));
spin_lock(&fiq->lock);
@@ -418,7 +427,7 @@
__fuse_get_request(req);
queue_request_and_unlock(fiq, req);
- request_wait_answer(fc, req);
+ request_wait_answer(req);
/* Pairs with smp_wmb() in fuse_request_end() */
smp_rmb();
}
@@ -457,8 +466,10 @@
}
}
-static void fuse_force_creds(struct fuse_conn *fc, struct fuse_req *req)
+static void fuse_force_creds(struct fuse_req *req)
{
+ struct fuse_conn *fc = req->fm->fc;
+
req->in.h.uid = from_kuid_munged(fc->user_ns, current_fsuid());
req->in.h.gid = from_kgid_munged(fc->user_ns, current_fsgid());
req->in.h.pid = pid_nr_ns(task_pid(current), fc->pid_ns);
@@ -473,23 +484,24 @@
__set_bit(FR_ASYNC, &req->flags);
}
-ssize_t fuse_simple_request(struct fuse_conn *fc, struct fuse_args *args)
+ssize_t fuse_simple_request(struct fuse_mount *fm, struct fuse_args *args)
{
+ struct fuse_conn *fc = fm->fc;
struct fuse_req *req;
ssize_t ret;
if (args->force) {
atomic_inc(&fc->num_waiting);
- req = fuse_request_alloc(GFP_KERNEL | __GFP_NOFAIL);
+ req = fuse_request_alloc(fm, GFP_KERNEL | __GFP_NOFAIL);
if (!args->nocreds)
- fuse_force_creds(fc, req);
+ fuse_force_creds(req);
__set_bit(FR_WAITING, &req->flags);
__set_bit(FR_FORCE, &req->flags);
} else {
WARN_ON(args->nocreds);
- req = fuse_get_req(fc, false);
+ req = fuse_get_req(fm, false);
if (IS_ERR(req))
return PTR_ERR(req);
}
@@ -500,20 +512,21 @@
if (!args->noreply)
__set_bit(FR_ISREPLY, &req->flags);
- __fuse_request_send(fc, req);
+ __fuse_request_send(req);
ret = req->out.h.error;
if (!ret && args->out_argvar) {
BUG_ON(args->out_numargs == 0);
ret = args->out_args[args->out_numargs - 1].size;
}
- fuse_put_request(fc, req);
+ fuse_put_request(req);
return ret;
}
-static bool fuse_request_queue_background(struct fuse_conn *fc,
- struct fuse_req *req)
+static bool fuse_request_queue_background(struct fuse_req *req)
{
+ struct fuse_mount *fm = req->fm;
+ struct fuse_conn *fc = fm->fc;
bool queued = false;
WARN_ON(!test_bit(FR_BACKGROUND, &req->flags));
@@ -527,9 +540,9 @@
fc->num_background++;
if (fc->num_background == fc->max_background)
fc->blocked = 1;
- if (fc->num_background == fc->congestion_threshold && fc->sb) {
- set_bdi_congested(fc->sb->s_bdi, BLK_RW_SYNC);
- set_bdi_congested(fc->sb->s_bdi, BLK_RW_ASYNC);
+ if (fc->num_background == fc->congestion_threshold && fm->sb) {
+ set_bdi_congested(fm->sb->s_bdi, BLK_RW_SYNC);
+ set_bdi_congested(fm->sb->s_bdi, BLK_RW_ASYNC);
}
list_add_tail(&req->list, &fc->bg_queue);
flush_bg_queue(fc);
@@ -540,28 +553,28 @@
return queued;
}
-int fuse_simple_background(struct fuse_conn *fc, struct fuse_args *args,
+int fuse_simple_background(struct fuse_mount *fm, struct fuse_args *args,
gfp_t gfp_flags)
{
struct fuse_req *req;
if (args->force) {
WARN_ON(!args->nocreds);
- req = fuse_request_alloc(gfp_flags);
+ req = fuse_request_alloc(fm, gfp_flags);
if (!req)
return -ENOMEM;
__set_bit(FR_BACKGROUND, &req->flags);
} else {
WARN_ON(args->nocreds);
- req = fuse_get_req(fc, true);
+ req = fuse_get_req(fm, true);
if (IS_ERR(req))
return PTR_ERR(req);
}
fuse_args_to_req(req, args);
- if (!fuse_request_queue_background(fc, req)) {
- fuse_put_request(fc, req);
+ if (!fuse_request_queue_background(req)) {
+ fuse_put_request(req);
return -ENOTCONN;
}
@@ -569,14 +582,14 @@
}
EXPORT_SYMBOL_GPL(fuse_simple_background);
-static int fuse_simple_notify_reply(struct fuse_conn *fc,
+static int fuse_simple_notify_reply(struct fuse_mount *fm,
struct fuse_args *args, u64 unique)
{
struct fuse_req *req;
- struct fuse_iqueue *fiq = &fc->iq;
+ struct fuse_iqueue *fiq = &fm->fc->iq;
int err = 0;
- req = fuse_get_req(fc, false);
+ req = fuse_get_req(fm, false);
if (IS_ERR(req))
return PTR_ERR(req);
@@ -591,7 +604,7 @@
} else {
err = -ENODEV;
spin_unlock(&fiq->lock);
- fuse_put_request(fc, req);
+ fuse_put_request(req);
}
return err;
@@ -785,15 +798,16 @@
struct page *newpage;
struct pipe_buffer *buf = cs->pipebufs;
+ get_page(oldpage);
err = unlock_request(cs->req);
if (err)
- return err;
+ goto out_put_old;
fuse_copy_finish(cs);
err = pipe_buf_confirm(cs->pipe, buf);
if (err)
- return err;
+ goto out_put_old;
BUG_ON(!cs->nr_segs);
cs->currbuf = buf;
@@ -833,7 +847,7 @@
err = replace_page_cache_page(oldpage, newpage, GFP_KERNEL);
if (err) {
unlock_page(newpage);
- return err;
+ goto out_put_old;
}
get_page(newpage);
@@ -852,14 +866,19 @@
if (err) {
unlock_page(newpage);
put_page(newpage);
- return err;
+ goto out_put_old;
}
unlock_page(oldpage);
+ /* Drop ref for ap->pages[] array */
put_page(oldpage);
cs->len = 0;
- return 0;
+ err = 0;
+out_put_old:
+ /* Drop ref obtained in this function */
+ put_page(oldpage);
+ return err;
out_fallback_unlock:
unlock_page(newpage);
@@ -868,10 +887,10 @@
cs->offset = buf->offset;
err = lock_request(cs->req);
- if (err)
- return err;
+ if (!err)
+ err = 1;
- return 1;
+ goto out_put_old;
}
static int fuse_ref_page(struct fuse_copy_state *cs, struct page *page,
@@ -883,14 +902,16 @@
if (cs->nr_segs >= cs->pipe->max_usage)
return -EIO;
+ get_page(page);
err = unlock_request(cs->req);
- if (err)
+ if (err) {
+ put_page(page);
return err;
+ }
fuse_copy_finish(cs);
buf = cs->pipebufs;
- get_page(page);
buf->page = page;
buf->offset = offset;
buf->len = count;
@@ -1250,7 +1271,7 @@
/* SETXATTR is special, since it may contain too large data */
if (args->opcode == FUSE_SETXATTR)
req->out.h.error = -E2BIG;
- fuse_request_end(fc, req);
+ fuse_request_end(req);
goto restart;
}
spin_lock(&fpq->lock);
@@ -1284,8 +1305,8 @@
/* matches barrier in request_wait_answer() */
smp_mb__after_atomic();
if (test_bit(FR_INTERRUPTED, &req->flags))
- queue_interrupt(fiq, req);
- fuse_put_request(fc, req);
+ queue_interrupt(req);
+ fuse_put_request(req);
return reqsize;
@@ -1293,7 +1314,7 @@
if (!test_bit(FR_PRIVATE, &req->flags))
list_del_init(&req->list);
spin_unlock(&fpq->lock);
- fuse_request_end(fc, req);
+ fuse_request_end(req);
return err;
err_unlock:
@@ -1416,11 +1437,8 @@
fuse_copy_finish(cs);
down_read(&fc->killsb);
- err = -ENOENT;
- if (fc->sb) {
- err = fuse_reverse_inval_inode(fc->sb, outarg.ino,
- outarg.off, outarg.len);
- }
+ err = fuse_reverse_inval_inode(fc, outarg.ino,
+ outarg.off, outarg.len);
up_read(&fc->killsb);
return err;
@@ -1466,9 +1484,7 @@
buf[outarg.namelen] = 0;
down_read(&fc->killsb);
- err = -ENOENT;
- if (fc->sb)
- err = fuse_reverse_inval_entry(fc->sb, outarg.parent, 0, &name);
+ err = fuse_reverse_inval_entry(fc, outarg.parent, 0, &name);
up_read(&fc->killsb);
kfree(buf);
return err;
@@ -1516,10 +1532,7 @@
buf[outarg.namelen] = 0;
down_read(&fc->killsb);
- err = -ENOENT;
- if (fc->sb)
- err = fuse_reverse_inval_entry(fc->sb, outarg.parent,
- outarg.child, &name);
+ err = fuse_reverse_inval_entry(fc, outarg.parent, outarg.child, &name);
up_read(&fc->killsb);
kfree(buf);
return err;
@@ -1561,10 +1574,7 @@
down_read(&fc->killsb);
err = -ENOENT;
- if (!fc->sb)
- goto out_up_killsb;
-
- inode = ilookup5(fc->sb, nodeid, fuse_inode_eq, &nodeid);
+ inode = fuse_ilookup(fc, nodeid, NULL);
if (!inode)
goto out_up_killsb;
@@ -1621,7 +1631,7 @@
struct fuse_notify_retrieve_in inarg;
};
-static void fuse_retrieve_end(struct fuse_conn *fc, struct fuse_args *args,
+static void fuse_retrieve_end(struct fuse_mount *fm, struct fuse_args *args,
int error)
{
struct fuse_retrieve_args *ra =
@@ -1631,7 +1641,7 @@
kfree(ra);
}
-static int fuse_retrieve(struct fuse_conn *fc, struct inode *inode,
+static int fuse_retrieve(struct fuse_mount *fm, struct inode *inode,
struct fuse_notify_retrieve_out *outarg)
{
int err;
@@ -1642,6 +1652,7 @@
unsigned int offset;
size_t total_len = 0;
unsigned int num_pages;
+ struct fuse_conn *fc = fm->fc;
struct fuse_retrieve_args *ra;
size_t args_size = sizeof(*ra);
struct fuse_args_pages *ap;
@@ -1703,9 +1714,9 @@
args->in_args[0].value = &ra->inarg;
args->in_args[1].size = total_len;
- err = fuse_simple_notify_reply(fc, args, outarg->notify_unique);
+ err = fuse_simple_notify_reply(fm, args, outarg->notify_unique);
if (err)
- fuse_retrieve_end(fc, args, err);
+ fuse_retrieve_end(fm, args, err);
return err;
}
@@ -1714,7 +1725,9 @@
struct fuse_copy_state *cs)
{
struct fuse_notify_retrieve_out outarg;
+ struct fuse_mount *fm;
struct inode *inode;
+ u64 nodeid;
int err;
err = -EINVAL;
@@ -1729,14 +1742,12 @@
down_read(&fc->killsb);
err = -ENOENT;
- if (fc->sb) {
- u64 nodeid = outarg.nodeid;
+ nodeid = outarg.nodeid;
- inode = ilookup5(fc->sb, nodeid, fuse_inode_eq, &nodeid);
- if (inode) {
- err = fuse_retrieve(fc, inode, &outarg);
- iput(inode);
- }
+ inode = fuse_ilookup(fc, nodeid, &fm);
+ if (inode) {
+ err = fuse_retrieve(fm, inode, &outarg);
+ iput(inode);
}
up_read(&fc->killsb);
@@ -1875,9 +1886,9 @@
else if (oh.error == -ENOSYS)
fc->no_interrupt = 1;
else if (oh.error == -EAGAIN)
- err = queue_interrupt(&fc->iq, req);
+ err = queue_interrupt(req);
- fuse_put_request(fc, req);
+ fuse_put_request(req);
goto copy_finish;
}
@@ -1907,7 +1918,7 @@
list_del_init(&req->list);
spin_unlock(&fpq->lock);
- fuse_request_end(fc, req);
+ fuse_request_end(req);
out:
return err ? err : nbytes;
@@ -2045,7 +2056,7 @@
}
/* Abort all requests on the given list (pending or processing) */
-static void end_requests(struct fuse_conn *fc, struct list_head *head)
+static void end_requests(struct list_head *head)
{
while (!list_empty(head)) {
struct fuse_req *req;
@@ -2053,7 +2064,7 @@
req->out.h.error = -ECONNABORTED;
clear_bit(FR_SENT, &req->flags);
list_del_init(&req->list);
- fuse_request_end(fc, req);
+ fuse_request_end(req);
}
}
@@ -2148,7 +2159,7 @@
wake_up_all(&fc->blocked_waitq);
spin_unlock(&fc->lock);
- end_requests(fc, &to_end);
+ end_requests(&to_end);
} else {
spin_unlock(&fc->lock);
}
@@ -2178,7 +2189,7 @@
list_splice_init(&fpq->processing[i], &to_end);
spin_unlock(&fpq->lock);
- end_requests(fc, &to_end);
+ end_requests(&to_end);
/* Are we the last open device? */
if (atomic_dec_and_test(&fc->dev_count)) {
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 26f028b..ff7dbeb 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -10,6 +10,7 @@
#include <linux/pagemap.h>
#include <linux/file.h>
+#include <linux/fs_context.h>
#include <linux/sched.h>
#include <linux/namei.h>
#include <linux/slab.h>
@@ -196,7 +197,7 @@
{
struct inode *inode;
struct dentry *parent;
- struct fuse_conn *fc;
+ struct fuse_mount *fm;
struct fuse_inode *fi;
int ret;
@@ -218,27 +219,29 @@
if (flags & LOOKUP_RCU)
goto out;
- fc = get_fuse_conn(inode);
+ fm = get_fuse_mount(inode);
forget = fuse_alloc_forget();
ret = -ENOMEM;
if (!forget)
goto out;
- attr_version = fuse_get_attr_version(fc);
+ attr_version = fuse_get_attr_version(fm->fc);
parent = dget_parent(entry);
- fuse_lookup_init(fc, &args, get_node_id(d_inode(parent)),
+ fuse_lookup_init(fm->fc, &args, get_node_id(d_inode(parent)),
&entry->d_name, &outarg);
- ret = fuse_simple_request(fc, &args);
+ ret = fuse_simple_request(fm, &args);
dput(parent);
/* Zero nodeid is same as -ENOENT */
if (!ret && !outarg.nodeid)
ret = -ENOENT;
if (!ret) {
fi = get_fuse_inode(inode);
- if (outarg.nodeid != get_node_id(inode)) {
- fuse_queue_forget(fc, forget, outarg.nodeid, 1);
+ if (outarg.nodeid != get_node_id(inode) ||
+ (bool) IS_AUTOMOUNT(inode) != (bool) (outarg.attr.flags & FUSE_ATTR_SUBMOUNT)) {
+ fuse_queue_forget(fm->fc, forget,
+ outarg.nodeid, 1);
goto invalid;
}
spin_lock(&fi->lock);
@@ -298,6 +301,79 @@
return time_before64(fuse_dentry_time(dentry), get_jiffies_64());
}
+/*
+ * Create a fuse_mount object with a new superblock (with path->dentry
+ * as the root), and return that mount so it can be auto-mounted on
+ * @path.
+ */
+static struct vfsmount *fuse_dentry_automount(struct path *path)
+{
+ struct fs_context *fsc;
+ struct fuse_mount *parent_fm = get_fuse_mount_super(path->mnt->mnt_sb);
+ struct fuse_conn *fc = parent_fm->fc;
+ struct fuse_mount *fm;
+ struct vfsmount *mnt;
+ struct fuse_inode *mp_fi = get_fuse_inode(d_inode(path->dentry));
+ struct super_block *sb;
+ int err;
+
+ fsc = fs_context_for_submount(path->mnt->mnt_sb->s_type, path->dentry);
+ if (IS_ERR(fsc)) {
+ err = PTR_ERR(fsc);
+ goto out;
+ }
+
+ err = -ENOMEM;
+ fm = kzalloc(sizeof(struct fuse_mount), GFP_KERNEL);
+ if (!fm)
+ goto out_put_fsc;
+
+ refcount_set(&fm->count, 1);
+ fsc->s_fs_info = fm;
+ sb = sget_fc(fsc, NULL, set_anon_super_fc);
+ if (IS_ERR(sb)) {
+ err = PTR_ERR(sb);
+ fuse_mount_put(fm);
+ goto out_put_fsc;
+ }
+ fm->fc = fuse_conn_get(fc);
+
+ /* Initialize superblock, making @mp_fi its root */
+ err = fuse_fill_super_submount(sb, mp_fi);
+ if (err)
+ goto out_put_sb;
+
+ sb->s_flags |= SB_ACTIVE;
+ fsc->root = dget(sb->s_root);
+ /* We are done configuring the superblock, so unlock it */
+ up_write(&sb->s_umount);
+
+ down_write(&fc->killsb);
+ list_add_tail(&fm->fc_entry, &fc->mounts);
+ up_write(&fc->killsb);
+
+ /* Create the submount */
+ mnt = vfs_create_mount(fsc);
+ if (IS_ERR(mnt)) {
+ err = PTR_ERR(mnt);
+ goto out_put_fsc;
+ }
+ mntget(mnt);
+ put_fs_context(fsc);
+ return mnt;
+
+out_put_sb:
+ /*
+ * Only jump here when fsc->root is NULL and sb is still locked
+ * (otherwise put_fs_context() will put the superblock)
+ */
+ deactivate_locked_super(sb);
+out_put_fsc:
+ put_fs_context(fsc);
+out:
+ return ERR_PTR(err);
+}
+
const struct dentry_operations fuse_dentry_operations = {
.d_revalidate = fuse_dentry_revalidate,
.d_delete = fuse_dentry_delete,
@@ -305,6 +381,7 @@
.d_init = fuse_dentry_init,
.d_release = fuse_dentry_release,
#endif
+ .d_automount = fuse_dentry_automount,
};
const struct dentry_operations fuse_root_dentry_operations = {
@@ -329,7 +406,7 @@
int fuse_lookup_name(struct super_block *sb, u64 nodeid, const struct qstr *name,
struct fuse_entry_out *outarg, struct inode **inode)
{
- struct fuse_conn *fc = get_fuse_conn_super(sb);
+ struct fuse_mount *fm = get_fuse_mount_super(sb);
FUSE_ARGS(args);
struct fuse_forget_link *forget;
u64 attr_version;
@@ -346,10 +423,10 @@
if (!forget)
goto out;
- attr_version = fuse_get_attr_version(fc);
+ attr_version = fuse_get_attr_version(fm->fc);
- fuse_lookup_init(fc, &args, nodeid, name, outarg);
- err = fuse_simple_request(fc, &args);
+ fuse_lookup_init(fm->fc, &args, nodeid, name, outarg);
+ err = fuse_simple_request(fm, &args);
/* Zero nodeid is same as -ENOENT, but with valid timeout */
if (err || !outarg->nodeid)
goto out_put_forget;
@@ -365,7 +442,7 @@
attr_version);
err = -ENOMEM;
if (!*inode) {
- fuse_queue_forget(fc, forget, outarg->nodeid, 1);
+ fuse_queue_forget(fm->fc, forget, outarg->nodeid, 1);
goto out;
}
err = 0;
@@ -434,7 +511,7 @@
{
int err;
struct inode *inode;
- struct fuse_conn *fc = get_fuse_conn(dir);
+ struct fuse_mount *fm = get_fuse_mount(dir);
FUSE_ARGS(args);
struct fuse_forget_link *forget;
struct fuse_create_in inarg;
@@ -452,11 +529,11 @@
goto out_err;
err = -ENOMEM;
- ff = fuse_file_alloc(fc);
+ ff = fuse_file_alloc(fm);
if (!ff)
goto out_put_forget_req;
- if (!fc->dont_mask)
+ if (!fm->fc->dont_mask)
mode &= ~current_umask();
flags &= ~O_NOCTTY;
@@ -477,7 +554,7 @@
args.out_args[0].value = &outentry;
args.out_args[1].size = sizeof(outopen);
args.out_args[1].value = &outopen;
- err = fuse_simple_request(fc, &args);
+ err = fuse_simple_request(fm, &args);
if (err)
goto out_free_ff;
@@ -494,7 +571,7 @@
if (!inode) {
flags &= ~(O_CREAT | O_EXCL | O_TRUNC);
fuse_sync_release(NULL, ff, flags);
- fuse_queue_forget(fc, forget, outentry.nodeid, 1);
+ fuse_queue_forget(fm->fc, forget, outentry.nodeid, 1);
err = -ENOMEM;
goto out_err;
}
@@ -567,7 +644,7 @@
/*
* Code shared between mknod, mkdir, symlink and link
*/
-static int create_new_entry(struct fuse_conn *fc, struct fuse_args *args,
+static int create_new_entry(struct fuse_mount *fm, struct fuse_args *args,
struct inode *dir, struct dentry *entry,
umode_t mode)
{
@@ -586,7 +663,7 @@
args->out_numargs = 1;
args->out_args[0].size = sizeof(outarg);
args->out_args[0].value = &outarg;
- err = fuse_simple_request(fc, args);
+ err = fuse_simple_request(fm, args);
if (err)
goto out_put_forget_req;
@@ -600,7 +677,7 @@
inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
&outarg.attr, entry_attr_timeout(&outarg), 0);
if (!inode) {
- fuse_queue_forget(fc, forget, outarg.nodeid, 1);
+ fuse_queue_forget(fm->fc, forget, outarg.nodeid, 1);
return -ENOMEM;
}
kfree(forget);
@@ -628,10 +705,10 @@
dev_t rdev)
{
struct fuse_mknod_in inarg;
- struct fuse_conn *fc = get_fuse_conn(dir);
+ struct fuse_mount *fm = get_fuse_mount(dir);
FUSE_ARGS(args);
- if (!fc->dont_mask)
+ if (!fm->fc->dont_mask)
mode &= ~current_umask();
memset(&inarg, 0, sizeof(inarg));
@@ -644,7 +721,7 @@
args.in_args[0].value = &inarg;
args.in_args[1].size = entry->d_name.len + 1;
args.in_args[1].value = entry->d_name.name;
- return create_new_entry(fc, &args, dir, entry, mode);
+ return create_new_entry(fm, &args, dir, entry, mode);
}
static int fuse_create(struct inode *dir, struct dentry *entry, umode_t mode,
@@ -656,10 +733,10 @@
static int fuse_mkdir(struct inode *dir, struct dentry *entry, umode_t mode)
{
struct fuse_mkdir_in inarg;
- struct fuse_conn *fc = get_fuse_conn(dir);
+ struct fuse_mount *fm = get_fuse_mount(dir);
FUSE_ARGS(args);
- if (!fc->dont_mask)
+ if (!fm->fc->dont_mask)
mode &= ~current_umask();
memset(&inarg, 0, sizeof(inarg));
@@ -671,13 +748,13 @@
args.in_args[0].value = &inarg;
args.in_args[1].size = entry->d_name.len + 1;
args.in_args[1].value = entry->d_name.name;
- return create_new_entry(fc, &args, dir, entry, S_IFDIR);
+ return create_new_entry(fm, &args, dir, entry, S_IFDIR);
}
static int fuse_symlink(struct inode *dir, struct dentry *entry,
const char *link)
{
- struct fuse_conn *fc = get_fuse_conn(dir);
+ struct fuse_mount *fm = get_fuse_mount(dir);
unsigned len = strlen(link) + 1;
FUSE_ARGS(args);
@@ -687,7 +764,7 @@
args.in_args[0].value = entry->d_name.name;
args.in_args[1].size = len;
args.in_args[1].value = link;
- return create_new_entry(fc, &args, dir, entry, S_IFLNK);
+ return create_new_entry(fm, &args, dir, entry, S_IFLNK);
}
void fuse_update_ctime(struct inode *inode)
@@ -701,7 +778,7 @@
static int fuse_unlink(struct inode *dir, struct dentry *entry)
{
int err;
- struct fuse_conn *fc = get_fuse_conn(dir);
+ struct fuse_mount *fm = get_fuse_mount(dir);
FUSE_ARGS(args);
args.opcode = FUSE_UNLINK;
@@ -709,13 +786,13 @@
args.in_numargs = 1;
args.in_args[0].size = entry->d_name.len + 1;
args.in_args[0].value = entry->d_name.name;
- err = fuse_simple_request(fc, &args);
+ err = fuse_simple_request(fm, &args);
if (!err) {
struct inode *inode = d_inode(entry);
struct fuse_inode *fi = get_fuse_inode(inode);
spin_lock(&fi->lock);
- fi->attr_version = atomic64_inc_return(&fc->attr_version);
+ fi->attr_version = atomic64_inc_return(&fm->fc->attr_version);
/*
* If i_nlink == 0 then unlink doesn't make sense, yet this can
* happen if userspace filesystem is careless. It would be
@@ -737,7 +814,7 @@
static int fuse_rmdir(struct inode *dir, struct dentry *entry)
{
int err;
- struct fuse_conn *fc = get_fuse_conn(dir);
+ struct fuse_mount *fm = get_fuse_mount(dir);
FUSE_ARGS(args);
args.opcode = FUSE_RMDIR;
@@ -745,7 +822,7 @@
args.in_numargs = 1;
args.in_args[0].size = entry->d_name.len + 1;
args.in_args[0].value = entry->d_name.name;
- err = fuse_simple_request(fc, &args);
+ err = fuse_simple_request(fm, &args);
if (!err) {
clear_nlink(d_inode(entry));
fuse_dir_changed(dir);
@@ -761,7 +838,7 @@
{
int err;
struct fuse_rename2_in inarg;
- struct fuse_conn *fc = get_fuse_conn(olddir);
+ struct fuse_mount *fm = get_fuse_mount(olddir);
FUSE_ARGS(args);
memset(&inarg, 0, argsize);
@@ -776,7 +853,7 @@
args.in_args[1].value = oldent->d_name.name;
args.in_args[2].size = newent->d_name.len + 1;
args.in_args[2].value = newent->d_name.name;
- err = fuse_simple_request(fc, &args);
+ err = fuse_simple_request(fm, &args);
if (!err) {
/* ctime changes */
fuse_invalidate_attr(d_inode(oldent));
@@ -847,7 +924,7 @@
int err;
struct fuse_link_in inarg;
struct inode *inode = d_inode(entry);
- struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_mount *fm = get_fuse_mount(inode);
FUSE_ARGS(args);
memset(&inarg, 0, sizeof(inarg));
@@ -858,7 +935,7 @@
args.in_args[0].value = &inarg;
args.in_args[1].size = newent->d_name.len + 1;
args.in_args[1].value = newent->d_name.name;
- err = create_new_entry(fc, &args, newdir, newent, inode->i_mode);
+ err = create_new_entry(fm, &args, newdir, newent, inode->i_mode);
/* Contrary to "normal" filesystems it can happen that link
makes two "logical" inodes point to the same "physical"
inode. We invalidate the attributes of the old one, so it
@@ -869,7 +946,7 @@
struct fuse_inode *fi = get_fuse_inode(inode);
spin_lock(&fi->lock);
- fi->attr_version = atomic64_inc_return(&fc->attr_version);
+ fi->attr_version = atomic64_inc_return(&fm->fc->attr_version);
if (likely(inode->i_nlink < UINT_MAX))
inc_nlink(inode);
spin_unlock(&fi->lock);
@@ -926,11 +1003,11 @@
int err;
struct fuse_getattr_in inarg;
struct fuse_attr_out outarg;
- struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_mount *fm = get_fuse_mount(inode);
FUSE_ARGS(args);
u64 attr_version;
- attr_version = fuse_get_attr_version(fc);
+ attr_version = fuse_get_attr_version(fm->fc);
memset(&inarg, 0, sizeof(inarg));
memset(&outarg, 0, sizeof(outarg));
@@ -949,7 +1026,7 @@
args.out_numargs = 1;
args.out_args[0].size = sizeof(outarg);
args.out_args[0].value = &outarg;
- err = fuse_simple_request(fc, &args);
+ err = fuse_simple_request(fm, &args);
if (!err) {
if (fuse_invalid_attr(&outarg.attr) ||
(inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
@@ -1002,7 +1079,7 @@
STATX_BASIC_STATS & ~STATX_ATIME, 0);
}
-int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
+int fuse_reverse_inval_entry(struct fuse_conn *fc, u64 parent_nodeid,
u64 child_nodeid, struct qstr *name)
{
int err = -ENOTDIR;
@@ -1010,7 +1087,7 @@
struct dentry *dir;
struct dentry *entry;
- parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid);
+ parent = fuse_ilookup(fc, parent_nodeid, NULL);
if (!parent)
return -ENOENT;
@@ -1102,14 +1179,14 @@
static int fuse_access(struct inode *inode, int mask)
{
- struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_mount *fm = get_fuse_mount(inode);
FUSE_ARGS(args);
struct fuse_access_in inarg;
int err;
BUG_ON(mask & MAY_NOT_BLOCK);
- if (fc->no_access)
+ if (fm->fc->no_access)
return 0;
memset(&inarg, 0, sizeof(inarg));
@@ -1119,9 +1196,9 @@
args.in_numargs = 1;
args.in_args[0].size = sizeof(inarg);
args.in_args[0].value = &inarg;
- err = fuse_simple_request(fc, &args);
+ err = fuse_simple_request(fm, &args);
if (err == -ENOSYS) {
- fc->no_access = 1;
+ fm->fc->no_access = 1;
err = 0;
}
return err;
@@ -1209,7 +1286,7 @@
static int fuse_readlink_page(struct inode *inode, struct page *page)
{
- struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_mount *fm = get_fuse_mount(inode);
struct fuse_page_desc desc = { .length = PAGE_SIZE - 1 };
struct fuse_args_pages ap = {
.num_pages = 1,
@@ -1226,7 +1303,7 @@
ap.args.page_zeroing = true;
ap.args.out_numargs = 1;
ap.args.out_args[0].size = desc.length;
- res = fuse_simple_request(fc, &ap.args);
+ res = fuse_simple_request(fm, &ap.args);
fuse_invalidate_atime(inode);
@@ -1454,7 +1531,7 @@
*/
int fuse_flush_times(struct inode *inode, struct fuse_file *ff)
{
- struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_mount *fm = get_fuse_mount(inode);
FUSE_ARGS(args);
struct fuse_setattr_in inarg;
struct fuse_attr_out outarg;
@@ -1465,7 +1542,7 @@
inarg.valid = FATTR_MTIME;
inarg.mtime = inode->i_mtime.tv_sec;
inarg.mtimensec = inode->i_mtime.tv_nsec;
- if (fc->minor >= 23) {
+ if (fm->fc->minor >= 23) {
inarg.valid |= FATTR_CTIME;
inarg.ctime = inode->i_ctime.tv_sec;
inarg.ctimensec = inode->i_ctime.tv_nsec;
@@ -1474,9 +1551,9 @@
inarg.valid |= FATTR_FH;
inarg.fh = ff->fh;
}
- fuse_setattr_fill(fc, &args, inode, &inarg, &outarg);
+ fuse_setattr_fill(fm->fc, &args, inode, &inarg, &outarg);
- return fuse_simple_request(fc, &args);
+ return fuse_simple_request(fm, &args);
}
/*
@@ -1491,7 +1568,8 @@
struct file *file)
{
struct inode *inode = d_inode(dentry);
- struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_mount *fm = get_fuse_mount(inode);
+ struct fuse_conn *fc = fm->fc;
struct fuse_inode *fi = get_fuse_inode(inode);
FUSE_ARGS(args);
struct fuse_setattr_in inarg;
@@ -1501,6 +1579,7 @@
loff_t oldsize;
int err;
bool trust_local_cmtime = is_wb && S_ISREG(inode->i_mode);
+ bool fault_blocked = false;
if (!fc->default_permissions)
attr->ia_valid |= ATTR_FORCE;
@@ -1509,6 +1588,22 @@
if (err)
return err;
+ if (attr->ia_valid & ATTR_SIZE) {
+ if (WARN_ON(!S_ISREG(inode->i_mode)))
+ return -EIO;
+ is_truncate = true;
+ }
+
+ if (FUSE_IS_DAX(inode) && is_truncate) {
+ down_write(&fi->i_mmap_sem);
+ fault_blocked = true;
+ err = fuse_dax_break_layouts(inode, 0, 0);
+ if (err) {
+ up_write(&fi->i_mmap_sem);
+ return err;
+ }
+ }
+
if (attr->ia_valid & ATTR_OPEN) {
/* This is coming from open(..., ... | O_TRUNC); */
WARN_ON(!(attr->ia_valid & ATTR_SIZE));
@@ -1521,17 +1616,11 @@
*/
i_size_write(inode, 0);
truncate_pagecache(inode, 0);
- return 0;
+ goto out;
}
file = NULL;
}
- if (attr->ia_valid & ATTR_SIZE) {
- if (WARN_ON(!S_ISREG(inode->i_mode)))
- return -EIO;
- is_truncate = true;
- }
-
/* Flush dirty data/metadata before non-truncate SETATTR */
if (is_wb && S_ISREG(inode->i_mode) &&
attr->ia_valid &
@@ -1566,7 +1655,7 @@
inarg.lock_owner = fuse_lock_owner_id(fc, current->files);
}
fuse_setattr_fill(fc, &args, inode, &inarg, &outarg);
- err = fuse_simple_request(fc, &args);
+ err = fuse_simple_request(fm, &args);
if (err) {
if (err == -EINTR)
fuse_invalidate_attr(inode);
@@ -1614,6 +1703,10 @@
}
clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
+out:
+ if (fault_blocked)
+ up_write(&fi->i_mmap_sem);
+
return 0;
error:
@@ -1621,6 +1714,9 @@
fuse_release_nowrite(inode);
clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
+
+ if (fault_blocked)
+ up_write(&fi->i_mmap_sem);
return err;
}
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 43c165e..c03034e 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -32,7 +32,7 @@
return pages;
}
-static int fuse_send_open(struct fuse_conn *fc, u64 nodeid, struct file *file,
+static int fuse_send_open(struct fuse_mount *fm, u64 nodeid, struct file *file,
int opcode, struct fuse_open_out *outargp)
{
struct fuse_open_in inarg;
@@ -40,7 +40,7 @@
memset(&inarg, 0, sizeof(inarg));
inarg.flags = file->f_flags & ~(O_CREAT | O_EXCL | O_NOCTTY);
- if (!fc->atomic_o_trunc)
+ if (!fm->fc->atomic_o_trunc)
inarg.flags &= ~O_TRUNC;
args.opcode = opcode;
args.nodeid = nodeid;
@@ -51,7 +51,7 @@
args.out_args[0].size = sizeof(*outargp);
args.out_args[0].value = outargp;
- return fuse_simple_request(fc, &args);
+ return fuse_simple_request(fm, &args);
}
struct fuse_release_args {
@@ -60,7 +60,7 @@
struct inode *inode;
};
-struct fuse_file *fuse_file_alloc(struct fuse_conn *fc)
+struct fuse_file *fuse_file_alloc(struct fuse_mount *fm)
{
struct fuse_file *ff;
@@ -68,7 +68,7 @@
if (unlikely(!ff))
return NULL;
- ff->fc = fc;
+ ff->fm = fm;
ff->release_args = kzalloc(sizeof(*ff->release_args),
GFP_KERNEL_ACCOUNT);
if (!ff->release_args) {
@@ -82,7 +82,7 @@
RB_CLEAR_NODE(&ff->polled_node);
init_waitqueue_head(&ff->poll_wait);
- ff->kh = atomic64_inc_return(&fc->khctr);
+ ff->kh = atomic64_inc_return(&fm->fc->khctr);
return ff;
}
@@ -100,7 +100,7 @@
return ff;
}
-static void fuse_release_end(struct fuse_conn *fc, struct fuse_args *args,
+static void fuse_release_end(struct fuse_mount *fm, struct fuse_args *args,
int error)
{
struct fuse_release_args *ra = container_of(args, typeof(*ra), args);
@@ -114,29 +114,30 @@
if (refcount_dec_and_test(&ff->count)) {
struct fuse_args *args = &ff->release_args->args;
- if (isdir ? ff->fc->no_opendir : ff->fc->no_open) {
+ if (isdir ? ff->fm->fc->no_opendir : ff->fm->fc->no_open) {
/* Do nothing when client does not implement 'open' */
- fuse_release_end(ff->fc, args, 0);
+ fuse_release_end(ff->fm, args, 0);
} else if (sync) {
- fuse_simple_request(ff->fc, args);
- fuse_release_end(ff->fc, args, 0);
+ fuse_simple_request(ff->fm, args);
+ fuse_release_end(ff->fm, args, 0);
} else {
args->end = fuse_release_end;
- if (fuse_simple_background(ff->fc, args,
+ if (fuse_simple_background(ff->fm, args,
GFP_KERNEL | __GFP_NOFAIL))
- fuse_release_end(ff->fc, args, -ENOTCONN);
+ fuse_release_end(ff->fm, args, -ENOTCONN);
}
kfree(ff);
}
}
-int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file,
+int fuse_do_open(struct fuse_mount *fm, u64 nodeid, struct file *file,
bool isdir)
{
+ struct fuse_conn *fc = fm->fc;
struct fuse_file *ff;
int opcode = isdir ? FUSE_OPENDIR : FUSE_OPEN;
- ff = fuse_file_alloc(fc);
+ ff = fuse_file_alloc(fm);
if (!ff)
return -ENOMEM;
@@ -147,7 +148,7 @@
struct fuse_open_out outarg;
int err;
- err = fuse_send_open(fc, nodeid, file, opcode, &outarg);
+ err = fuse_send_open(fm, nodeid, file, opcode, &outarg);
if (!err) {
ff->fh = outarg.fh;
ff->open_flags = outarg.open_flags;
@@ -216,27 +217,40 @@
int fuse_open_common(struct inode *inode, struct file *file, bool isdir)
{
- struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_mount *fm = get_fuse_mount(inode);
+ struct fuse_conn *fc = fm->fc;
int err;
bool is_wb_truncate = (file->f_flags & O_TRUNC) &&
fc->atomic_o_trunc &&
fc->writeback_cache;
+ bool dax_truncate = (file->f_flags & O_TRUNC) &&
+ fc->atomic_o_trunc && FUSE_IS_DAX(inode);
err = generic_file_open(inode, file);
if (err)
return err;
- if (is_wb_truncate) {
+ if (is_wb_truncate || dax_truncate) {
inode_lock(inode);
fuse_set_nowrite(inode);
}
- err = fuse_do_open(fc, get_node_id(inode), file, isdir);
+ if (dax_truncate) {
+ down_write(&get_fuse_inode(inode)->i_mmap_sem);
+ err = fuse_dax_break_layouts(inode, 0, 0);
+ if (err)
+ goto out;
+ }
+ err = fuse_do_open(fm, get_node_id(inode), file, isdir);
if (!err)
fuse_finish_open(inode, file);
- if (is_wb_truncate) {
+out:
+ if (dax_truncate)
+ up_write(&get_fuse_inode(inode)->i_mmap_sem);
+
+ if (is_wb_truncate | dax_truncate) {
fuse_release_nowrite(inode);
inode_unlock(inode);
}
@@ -247,7 +261,7 @@
static void fuse_prepare_release(struct fuse_inode *fi, struct fuse_file *ff,
int flags, int opcode)
{
- struct fuse_conn *fc = ff->fc;
+ struct fuse_conn *fc = ff->fm->fc;
struct fuse_release_args *ra = ff->release_args;
/* Inode is NULL on error path of fuse_create_open() */
@@ -285,7 +299,7 @@
if (ff->flock) {
ra->inarg.release_flags |= FUSE_RELEASE_FLOCK_UNLOCK;
- ra->inarg.lock_owner = fuse_lock_owner_id(ff->fc,
+ ra->inarg.lock_owner = fuse_lock_owner_id(ff->fm->fc,
(fl_owner_t) file);
}
/* Hold inode until release is finished */
@@ -300,7 +314,7 @@
* synchronous RELEASE is allowed (and desirable) in this case
* because the server can be trusted not to screw up.
*/
- fuse_file_put(ff, ff->fc->destroy, isdir);
+ fuse_file_put(ff, ff->fm->fc->destroy, isdir);
}
static int fuse_open(struct inode *inode, struct file *file)
@@ -443,7 +457,7 @@
static int fuse_flush(struct file *file, fl_owner_t id)
{
struct inode *inode = file_inode(file);
- struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_mount *fm = get_fuse_mount(inode);
struct fuse_file *ff = file->private_data;
struct fuse_flush_in inarg;
FUSE_ARGS(args);
@@ -465,12 +479,12 @@
return err;
err = 0;
- if (fc->no_flush)
+ if (fm->fc->no_flush)
goto inval_attr_out;
memset(&inarg, 0, sizeof(inarg));
inarg.fh = ff->fh;
- inarg.lock_owner = fuse_lock_owner_id(fc, id);
+ inarg.lock_owner = fuse_lock_owner_id(fm->fc, id);
args.opcode = FUSE_FLUSH;
args.nodeid = get_node_id(inode);
args.in_numargs = 1;
@@ -478,9 +492,9 @@
args.in_args[0].value = &inarg;
args.force = true;
- err = fuse_simple_request(fc, &args);
+ err = fuse_simple_request(fm, &args);
if (err == -ENOSYS) {
- fc->no_flush = 1;
+ fm->fc->no_flush = 1;
err = 0;
}
@@ -489,7 +503,7 @@
* In memory i_blocks is not maintained by fuse, if writeback cache is
* enabled, i_blocks from cached attr may not be accurate.
*/
- if (!err && fc->writeback_cache)
+ if (!err && fm->fc->writeback_cache)
fuse_invalidate_attr(inode);
return err;
}
@@ -498,7 +512,7 @@
int datasync, int opcode)
{
struct inode *inode = file->f_mapping->host;
- struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_mount *fm = get_fuse_mount(inode);
struct fuse_file *ff = file->private_data;
FUSE_ARGS(args);
struct fuse_fsync_in inarg;
@@ -511,7 +525,7 @@
args.in_numargs = 1;
args.in_args[0].size = sizeof(inarg);
args.in_args[0].value = &inarg;
- return fuse_simple_request(fc, &args);
+ return fuse_simple_request(fm, &args);
}
static int fuse_fsync(struct file *file, loff_t start, loff_t end,
@@ -686,7 +700,7 @@
kfree(ia);
}
-static void fuse_aio_complete_req(struct fuse_conn *fc, struct fuse_args *args,
+static void fuse_aio_complete_req(struct fuse_mount *fm, struct fuse_args *args,
int err)
{
struct fuse_io_args *ia = container_of(args, typeof(*ia), ap.args);
@@ -715,7 +729,7 @@
fuse_io_free(ia);
}
-static ssize_t fuse_async_req_send(struct fuse_conn *fc,
+static ssize_t fuse_async_req_send(struct fuse_mount *fm,
struct fuse_io_args *ia, size_t num_bytes)
{
ssize_t err;
@@ -729,9 +743,9 @@
ia->ap.args.end = fuse_aio_complete_req;
ia->ap.args.may_block = io->should_dirty;
- err = fuse_simple_background(fc, &ia->ap.args, GFP_KERNEL);
+ err = fuse_simple_background(fm, &ia->ap.args, GFP_KERNEL);
if (err)
- fuse_aio_complete_req(fc, &ia->ap.args, err);
+ fuse_aio_complete_req(fm, &ia->ap.args, err);
return num_bytes;
}
@@ -741,18 +755,18 @@
{
struct file *file = ia->io->iocb->ki_filp;
struct fuse_file *ff = file->private_data;
- struct fuse_conn *fc = ff->fc;
+ struct fuse_mount *fm = ff->fm;
fuse_read_args_fill(ia, file, pos, count, FUSE_READ);
if (owner != NULL) {
ia->read.in.read_flags |= FUSE_READ_LOCKOWNER;
- ia->read.in.lock_owner = fuse_lock_owner_id(fc, owner);
+ ia->read.in.lock_owner = fuse_lock_owner_id(fm->fc, owner);
}
if (ia->io->async)
- return fuse_async_req_send(fc, ia, count);
+ return fuse_async_req_send(fm, ia, count);
- return fuse_simple_request(fc, &ia->ap.args);
+ return fuse_simple_request(fm, &ia->ap.args);
}
static void fuse_read_update_size(struct inode *inode, loff_t size,
@@ -798,7 +812,7 @@
static int fuse_do_readpage(struct file *file, struct page *page)
{
struct inode *inode = page->mapping->host;
- struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_mount *fm = get_fuse_mount(inode);
loff_t pos = page_offset(page);
struct fuse_page_desc desc = { .length = PAGE_SIZE };
struct fuse_io_args ia = {
@@ -818,14 +832,14 @@
*/
fuse_wait_on_page_writeback(inode, page->index);
- attr_ver = fuse_get_attr_version(fc);
+ attr_ver = fuse_get_attr_version(fm->fc);
/* Don't overflow end offset */
if (pos + (desc.length - 1) == LLONG_MAX)
desc.length--;
fuse_read_args_fill(&ia, file, pos, desc.length, FUSE_READ);
- res = fuse_simple_request(fc, &ia.ap.args);
+ res = fuse_simple_request(fm, &ia.ap.args);
if (res < 0)
return res;
/*
@@ -855,7 +869,7 @@
return err;
}
-static void fuse_readpages_end(struct fuse_conn *fc, struct fuse_args *args,
+static void fuse_readpages_end(struct fuse_mount *fm, struct fuse_args *args,
int err)
{
int i;
@@ -899,7 +913,7 @@
static void fuse_send_readpages(struct fuse_io_args *ia, struct file *file)
{
struct fuse_file *ff = file->private_data;
- struct fuse_conn *fc = ff->fc;
+ struct fuse_mount *fm = ff->fm;
struct fuse_args_pages *ap = &ia->ap;
loff_t pos = page_offset(ap->pages[0]);
size_t count = ap->num_pages << PAGE_SHIFT;
@@ -918,18 +932,18 @@
WARN_ON((loff_t) (pos + count) < 0);
fuse_read_args_fill(ia, file, pos, count, FUSE_READ);
- ia->read.attr_ver = fuse_get_attr_version(fc);
- if (fc->async_read) {
+ ia->read.attr_ver = fuse_get_attr_version(fm->fc);
+ if (fm->fc->async_read) {
ia->ff = fuse_file_get(ff);
ap->args.end = fuse_readpages_end;
- err = fuse_simple_background(fc, &ap->args, GFP_KERNEL);
+ err = fuse_simple_background(fm, &ap->args, GFP_KERNEL);
if (!err)
return;
} else {
- res = fuse_simple_request(fc, &ap->args);
+ res = fuse_simple_request(fm, &ap->args);
err = res < 0 ? res : 0;
}
- fuse_readpages_end(fc, &ap->args, err);
+ fuse_readpages_end(fm, &ap->args, err);
}
static void fuse_readahead(struct readahead_control *rac)
@@ -1000,7 +1014,7 @@
args->opcode = FUSE_WRITE;
args->nodeid = ff->nodeid;
args->in_numargs = 2;
- if (ff->fc->minor < 9)
+ if (ff->fm->fc->minor < 9)
args->in_args[0].size = FUSE_COMPAT_WRITE_IN_SIZE;
else
args->in_args[0].size = sizeof(ia->write.in);
@@ -1029,7 +1043,7 @@
struct kiocb *iocb = ia->io->iocb;
struct file *file = iocb->ki_filp;
struct fuse_file *ff = file->private_data;
- struct fuse_conn *fc = ff->fc;
+ struct fuse_mount *fm = ff->fm;
struct fuse_write_in *inarg = &ia->write.in;
ssize_t err;
@@ -1037,13 +1051,13 @@
inarg->flags = fuse_write_flags(iocb);
if (owner != NULL) {
inarg->write_flags |= FUSE_WRITE_LOCKOWNER;
- inarg->lock_owner = fuse_lock_owner_id(fc, owner);
+ inarg->lock_owner = fuse_lock_owner_id(fm->fc, owner);
}
if (ia->io->async)
- return fuse_async_req_send(fc, ia, count);
+ return fuse_async_req_send(fm, ia, count);
- err = fuse_simple_request(fc, &ia->ap.args);
+ err = fuse_simple_request(fm, &ia->ap.args);
if (!err && ia->write.out.size > count)
err = -EIO;
@@ -1074,7 +1088,7 @@
struct fuse_args_pages *ap = &ia->ap;
struct file *file = iocb->ki_filp;
struct fuse_file *ff = file->private_data;
- struct fuse_conn *fc = ff->fc;
+ struct fuse_mount *fm = ff->fm;
unsigned int offset, i;
int err;
@@ -1084,7 +1098,7 @@
fuse_write_args_fill(ia, ff, pos, count);
ia->write.in.flags = fuse_write_flags(iocb);
- err = fuse_simple_request(fc, &ap->args);
+ err = fuse_simple_request(fm, &ap->args);
if (!err && ia->write.out.size > count)
err = -EIO;
@@ -1399,7 +1413,7 @@
struct file *file = io->iocb->ki_filp;
struct inode *inode = file->f_mapping->host;
struct fuse_file *ff = file->private_data;
- struct fuse_conn *fc = ff->fc;
+ struct fuse_conn *fc = ff->fm->fc;
size_t nmax = write ? fc->max_write : fc->max_read;
loff_t pos = *ppos;
size_t count = iov_iter_count(iter);
@@ -1539,10 +1553,14 @@
{
struct file *file = iocb->ki_filp;
struct fuse_file *ff = file->private_data;
+ struct inode *inode = file_inode(file);
- if (is_bad_inode(file_inode(file)))
+ if (is_bad_inode(inode))
return -EIO;
+ if (FUSE_IS_DAX(inode))
+ return fuse_dax_read_iter(iocb, to);
+
if (!(ff->open_flags & FOPEN_DIRECT_IO))
return fuse_cache_read_iter(iocb, to);
else
@@ -1553,10 +1571,14 @@
{
struct file *file = iocb->ki_filp;
struct fuse_file *ff = file->private_data;
+ struct inode *inode = file_inode(file);
- if (is_bad_inode(file_inode(file)))
+ if (is_bad_inode(inode))
return -EIO;
+ if (FUSE_IS_DAX(inode))
+ return fuse_dax_write_iter(iocb, from);
+
if (!(ff->open_flags & FOPEN_DIRECT_IO))
return fuse_cache_write_iter(iocb, from);
else
@@ -1578,7 +1600,7 @@
kfree(wpa);
}
-static void fuse_writepage_finish(struct fuse_conn *fc,
+static void fuse_writepage_finish(struct fuse_mount *fm,
struct fuse_writepage_args *wpa)
{
struct fuse_args_pages *ap = &wpa->ia.ap;
@@ -1596,7 +1618,7 @@
}
/* Called under fi->lock, may release and reacquire it */
-static void fuse_send_writepage(struct fuse_conn *fc,
+static void fuse_send_writepage(struct fuse_mount *fm,
struct fuse_writepage_args *wpa, loff_t size)
__releases(fi->lock)
__acquires(fi->lock)
@@ -1622,10 +1644,10 @@
args->force = true;
args->nocreds = true;
- err = fuse_simple_background(fc, args, GFP_ATOMIC);
+ err = fuse_simple_background(fm, args, GFP_ATOMIC);
if (err == -ENOMEM) {
spin_unlock(&fi->lock);
- err = fuse_simple_background(fc, args, GFP_NOFS | __GFP_NOFAIL);
+ err = fuse_simple_background(fm, args, GFP_NOFS | __GFP_NOFAIL);
spin_lock(&fi->lock);
}
@@ -1638,7 +1660,7 @@
out_free:
fi->writectr--;
rb_erase(&wpa->writepages_entry, &fi->writepages);
- fuse_writepage_finish(fc, wpa);
+ fuse_writepage_finish(fm, wpa);
spin_unlock(&fi->lock);
/* After fuse_writepage_finish() aux request list is private */
@@ -1662,7 +1684,7 @@
__releases(fi->lock)
__acquires(fi->lock)
{
- struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_mount *fm = get_fuse_mount(inode);
struct fuse_inode *fi = get_fuse_inode(inode);
loff_t crop = i_size_read(inode);
struct fuse_writepage_args *wpa;
@@ -1671,7 +1693,7 @@
wpa = list_entry(fi->queued_writes.next,
struct fuse_writepage_args, queue_entry);
list_del_init(&wpa->queue_entry);
- fuse_send_writepage(fc, wpa, crop);
+ fuse_send_writepage(fm, wpa, crop);
}
}
@@ -1712,7 +1734,7 @@
WARN_ON(fuse_insert_writeback(root, wpa));
}
-static void fuse_writepage_end(struct fuse_conn *fc, struct fuse_args *args,
+static void fuse_writepage_end(struct fuse_mount *fm, struct fuse_args *args,
int error)
{
struct fuse_writepage_args *wpa =
@@ -1724,7 +1746,7 @@
spin_lock(&fi->lock);
rb_erase(&wpa->writepages_entry, &fi->writepages);
while (wpa->next) {
- struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_mount *fm = get_fuse_mount(inode);
struct fuse_write_in *inarg = &wpa->ia.write.in;
struct fuse_writepage_args *next = wpa->next;
@@ -1756,10 +1778,10 @@
* no invocations of fuse_writepage_end() while we're in
* fuse_set_nowrite..fuse_release_nowrite section.
*/
- fuse_send_writepage(fc, next, inarg->offset + inarg->size);
+ fuse_send_writepage(fm, next, inarg->offset + inarg->size);
}
fi->writectr--;
- fuse_writepage_finish(fc, wpa);
+ fuse_writepage_finish(fm, wpa);
spin_unlock(&fi->lock);
fuse_writepage_free(wpa);
}
@@ -2317,6 +2339,10 @@
{
struct fuse_file *ff = file->private_data;
+ /* DAX mmap is superior to direct_io mmap */
+ if (FUSE_IS_DAX(file_inode(file)))
+ return fuse_dax_mmap(file, vma);
+
if (ff->open_flags & FOPEN_DIRECT_IO) {
/* Can't provide the coherency needed for MAP_SHARED */
if (vma->vm_flags & VM_MAYSHARE)
@@ -2395,7 +2421,7 @@
static int fuse_getlk(struct file *file, struct file_lock *fl)
{
struct inode *inode = file_inode(file);
- struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_mount *fm = get_fuse_mount(inode);
FUSE_ARGS(args);
struct fuse_lk_in inarg;
struct fuse_lk_out outarg;
@@ -2405,9 +2431,9 @@
args.out_numargs = 1;
args.out_args[0].size = sizeof(outarg);
args.out_args[0].value = &outarg;
- err = fuse_simple_request(fc, &args);
+ err = fuse_simple_request(fm, &args);
if (!err)
- err = convert_fuse_file_lock(fc, &outarg.lk, fl);
+ err = convert_fuse_file_lock(fm->fc, &outarg.lk, fl);
return err;
}
@@ -2415,12 +2441,12 @@
static int fuse_setlk(struct file *file, struct file_lock *fl, int flock)
{
struct inode *inode = file_inode(file);
- struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_mount *fm = get_fuse_mount(inode);
FUSE_ARGS(args);
struct fuse_lk_in inarg;
int opcode = (fl->fl_flags & FL_SLEEP) ? FUSE_SETLKW : FUSE_SETLK;
struct pid *pid = fl->fl_type != F_UNLCK ? task_tgid(current) : NULL;
- pid_t pid_nr = pid_nr_ns(pid, fc->pid_ns);
+ pid_t pid_nr = pid_nr_ns(pid, fm->fc->pid_ns);
int err;
if (fl->fl_lmops && fl->fl_lmops->lm_grant) {
@@ -2433,7 +2459,7 @@
return 0;
fuse_lk_fill(&args, file, fl, opcode, pid_nr, flock, &inarg);
- err = fuse_simple_request(fc, &args);
+ err = fuse_simple_request(fm, &args);
/* locking is restartable */
if (err == -EINTR)
@@ -2487,13 +2513,13 @@
static sector_t fuse_bmap(struct address_space *mapping, sector_t block)
{
struct inode *inode = mapping->host;
- struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_mount *fm = get_fuse_mount(inode);
FUSE_ARGS(args);
struct fuse_bmap_in inarg;
struct fuse_bmap_out outarg;
int err;
- if (!inode->i_sb->s_bdev || fc->no_bmap)
+ if (!inode->i_sb->s_bdev || fm->fc->no_bmap)
return 0;
memset(&inarg, 0, sizeof(inarg));
@@ -2507,9 +2533,9 @@
args.out_numargs = 1;
args.out_args[0].size = sizeof(outarg);
args.out_args[0].value = &outarg;
- err = fuse_simple_request(fc, &args);
+ err = fuse_simple_request(fm, &args);
if (err == -ENOSYS)
- fc->no_bmap = 1;
+ fm->fc->no_bmap = 1;
return err ? 0 : outarg.block;
}
@@ -2517,7 +2543,7 @@
static loff_t fuse_lseek(struct file *file, loff_t offset, int whence)
{
struct inode *inode = file->f_mapping->host;
- struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_mount *fm = get_fuse_mount(inode);
struct fuse_file *ff = file->private_data;
FUSE_ARGS(args);
struct fuse_lseek_in inarg = {
@@ -2528,7 +2554,7 @@
struct fuse_lseek_out outarg;
int err;
- if (fc->no_lseek)
+ if (fm->fc->no_lseek)
goto fallback;
args.opcode = FUSE_LSEEK;
@@ -2539,10 +2565,10 @@
args.out_numargs = 1;
args.out_args[0].size = sizeof(outarg);
args.out_args[0].value = &outarg;
- err = fuse_simple_request(fc, &args);
+ err = fuse_simple_request(fm, &args);
if (err) {
if (err == -ENOSYS) {
- fc->no_lseek = 1;
+ fm->fc->no_lseek = 1;
goto fallback;
}
return err;
@@ -2728,7 +2754,7 @@
unsigned int flags)
{
struct fuse_file *ff = file->private_data;
- struct fuse_conn *fc = ff->fc;
+ struct fuse_mount *fm = ff->fm;
struct fuse_ioctl_in inarg = {
.fh = ff->fh,
.cmd = cmd,
@@ -2761,12 +2787,12 @@
BUILD_BUG_ON(sizeof(struct fuse_ioctl_iovec) * FUSE_IOCTL_MAX_IOV > PAGE_SIZE);
err = -ENOMEM;
- ap.pages = fuse_pages_alloc(fc->max_pages, GFP_KERNEL, &ap.descs);
+ ap.pages = fuse_pages_alloc(fm->fc->max_pages, GFP_KERNEL, &ap.descs);
iov_page = (struct iovec *) __get_free_page(GFP_KERNEL);
if (!ap.pages || !iov_page)
goto out;
- fuse_page_descs_length_init(ap.descs, 0, fc->max_pages);
+ fuse_page_descs_length_init(ap.descs, 0, fm->fc->max_pages);
/*
* If restricted, initialize IO parameters as encoded in @cmd.
@@ -2811,7 +2837,7 @@
/* make sure there are enough buffer pages and init request with them */
err = -ENOMEM;
- if (max_pages > fc->max_pages)
+ if (max_pages > fm->fc->max_pages)
goto out;
while (ap.num_pages < max_pages) {
ap.pages[ap.num_pages] = alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
@@ -2848,7 +2874,7 @@
ap.args.out_pages = true;
ap.args.out_argvar = true;
- transferred = fuse_simple_request(fc, &ap.args);
+ transferred = fuse_simple_request(fm, &ap.args);
err = transferred;
if (transferred < 0)
goto out;
@@ -2876,7 +2902,7 @@
goto out;
vaddr = kmap_atomic(ap.pages[0]);
- err = fuse_copy_ioctl_iovec(fc, iov_page, vaddr,
+ err = fuse_copy_ioctl_iovec(fm->fc, iov_page, vaddr,
transferred, in_iovs + out_iovs,
(flags & FUSE_IOCTL_COMPAT) != 0);
kunmap_atomic(vaddr);
@@ -2886,11 +2912,11 @@
in_iov = iov_page;
out_iov = in_iov + in_iovs;
- err = fuse_verify_ioctl_iov(fc, in_iov, in_iovs);
+ err = fuse_verify_ioctl_iov(fm->fc, in_iov, in_iovs);
if (err)
goto out;
- err = fuse_verify_ioctl_iov(fc, out_iov, out_iovs);
+ err = fuse_verify_ioctl_iov(fm->fc, out_iov, out_iovs);
if (err)
goto out;
@@ -3000,13 +3026,13 @@
__poll_t fuse_file_poll(struct file *file, poll_table *wait)
{
struct fuse_file *ff = file->private_data;
- struct fuse_conn *fc = ff->fc;
+ struct fuse_mount *fm = ff->fm;
struct fuse_poll_in inarg = { .fh = ff->fh, .kh = ff->kh };
struct fuse_poll_out outarg;
FUSE_ARGS(args);
int err;
- if (fc->no_poll)
+ if (fm->fc->no_poll)
return DEFAULT_POLLMASK;
poll_wait(file, &ff->poll_wait, wait);
@@ -3018,7 +3044,7 @@
*/
if (waitqueue_active(&ff->poll_wait)) {
inarg.flags |= FUSE_POLL_SCHEDULE_NOTIFY;
- fuse_register_polled_file(fc, ff);
+ fuse_register_polled_file(fm->fc, ff);
}
args.opcode = FUSE_POLL;
@@ -3029,12 +3055,12 @@
args.out_numargs = 1;
args.out_args[0].size = sizeof(outarg);
args.out_args[0].value = &outarg;
- err = fuse_simple_request(fc, &args);
+ err = fuse_simple_request(fm, &args);
if (!err)
return demangle_poll(outarg.revents);
if (err == -ENOSYS) {
- fc->no_poll = 1;
+ fm->fc->no_poll = 1;
return DEFAULT_POLLMASK;
}
return EPOLLERR;
@@ -3120,13 +3146,13 @@
* By default, we want to optimize all I/Os with async request
* submission to the client filesystem if supported.
*/
- io->async = ff->fc->async_dio;
+ io->async = ff->fm->fc->async_dio;
io->iocb = iocb;
io->blocking = is_sync_kiocb(iocb);
/* optimization for short read */
if (io->async && !io->write && offset + count > i_size) {
- iov_iter_truncate(iter, fuse_round_up(ff->fc, i_size - offset));
+ iov_iter_truncate(iter, fuse_round_up(ff->fm->fc, i_size - offset));
shortened = count - iov_iter_count(iter);
count -= shortened;
}
@@ -3196,7 +3222,7 @@
struct fuse_file *ff = file->private_data;
struct inode *inode = file_inode(file);
struct fuse_inode *fi = get_fuse_inode(inode);
- struct fuse_conn *fc = ff->fc;
+ struct fuse_mount *fm = ff->fm;
FUSE_ARGS(args);
struct fuse_fallocate_in inarg = {
.fh = ff->fh,
@@ -3208,14 +3234,23 @@
bool lock_inode = !(mode & FALLOC_FL_KEEP_SIZE) ||
(mode & FALLOC_FL_PUNCH_HOLE);
+ bool block_faults = FUSE_IS_DAX(inode) && lock_inode;
+
if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
return -EOPNOTSUPP;
- if (fc->no_fallocate)
+ if (fm->fc->no_fallocate)
return -EOPNOTSUPP;
if (lock_inode) {
inode_lock(inode);
+ if (block_faults) {
+ down_write(&fi->i_mmap_sem);
+ err = fuse_dax_break_layouts(inode, 0, 0);
+ if (err)
+ goto out;
+ }
+
if (mode & FALLOC_FL_PUNCH_HOLE) {
loff_t endbyte = offset + length - 1;
@@ -3240,9 +3275,9 @@
args.in_numargs = 1;
args.in_args[0].size = sizeof(inarg);
args.in_args[0].value = &inarg;
- err = fuse_simple_request(fc, &args);
+ err = fuse_simple_request(fm, &args);
if (err == -ENOSYS) {
- fc->no_fallocate = 1;
+ fm->fc->no_fallocate = 1;
err = -EOPNOTSUPP;
}
if (err)
@@ -3252,7 +3287,7 @@
if (!(mode & FALLOC_FL_KEEP_SIZE)) {
bool changed = fuse_write_update_size(inode, offset + length);
- if (changed && fc->writeback_cache)
+ if (changed && fm->fc->writeback_cache)
file_update_time(file);
}
@@ -3265,6 +3300,9 @@
if (!(mode & FALLOC_FL_KEEP_SIZE))
clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
+ if (block_faults)
+ up_write(&fi->i_mmap_sem);
+
if (lock_inode)
inode_unlock(inode);
@@ -3280,7 +3318,8 @@
struct inode *inode_in = file_inode(file_in);
struct inode *inode_out = file_inode(file_out);
struct fuse_inode *fi_out = get_fuse_inode(inode_out);
- struct fuse_conn *fc = ff_in->fc;
+ struct fuse_mount *fm = ff_in->fm;
+ struct fuse_conn *fc = fm->fc;
FUSE_ARGS(args);
struct fuse_copy_file_range_in inarg = {
.fh_in = ff_in->fh,
@@ -3349,7 +3388,7 @@
args.out_numargs = 1;
args.out_args[0].size = sizeof(outarg);
args.out_args[0].value = &outarg;
- err = fuse_simple_request(fc, &args);
+ err = fuse_simple_request(fm, &args);
if (err == -ENOSYS) {
fc->no_copy_file_range = 1;
err = -EOPNOTSUPP;
@@ -3404,6 +3443,7 @@
.release = fuse_release,
.fsync = fuse_fsync,
.lock = fuse_file_lock,
+ .get_unmapped_area = thp_get_unmapped_area,
.flock = fuse_file_flock,
.splice_read = generic_file_splice_read,
.splice_write = iter_file_splice_write,
@@ -3439,4 +3479,7 @@
fi->writectr = 0;
init_waitqueue_head(&fi->page_waitq);
fi->writepages = RB_ROOT;
+
+ if (IS_ENABLED(CONFIG_FUSE_DAX))
+ fuse_dax_inode_init(inode);
}
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 740a8a7..d515980 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -148,6 +148,20 @@
/** Lock to protect write related fields */
spinlock_t lock;
+
+ /**
+ * Can't take inode lock in fault path (leads to circular dependency).
+ * Introduce another semaphore which can be taken in fault path and
+ * then other filesystem paths can take this to block faults.
+ */
+ struct rw_semaphore i_mmap_sem;
+
+#ifdef CONFIG_FUSE_DAX
+ /*
+ * Dax specific inode data
+ */
+ struct fuse_inode_dax *dax;
+#endif
};
/** FUSE inode state bits */
@@ -161,12 +175,13 @@
};
struct fuse_conn;
+struct fuse_mount;
struct fuse_release_args;
/** FUSE specific file data */
struct fuse_file {
/** Fuse connection for this file */
- struct fuse_conn *fc;
+ struct fuse_mount *fm;
/* Argument space reserved for release */
struct fuse_release_args *release_args;
@@ -252,7 +267,7 @@
bool may_block:1;
struct fuse_in_arg in_args[3];
struct fuse_arg out_args[2];
- void (*end)(struct fuse_conn *fc, struct fuse_args *args, int error);
+ void (*end)(struct fuse_mount *fm, struct fuse_args *args, int error);
};
struct fuse_args_pages {
@@ -360,6 +375,9 @@
/** virtio-fs's physically contiguous buffer for in and out args */
void *argbuf;
#endif
+
+ /** fuse_mount this request belongs to */
+ struct fuse_mount *fm;
};
struct fuse_iqueue;
@@ -482,11 +500,15 @@
bool destroy:1;
bool no_control:1;
bool no_force_umount:1;
- bool no_mount_options:1;
+ bool legacy_opts_show:1;
+ bool dax:1;
unsigned int max_read;
unsigned int blksize;
const char *subtype;
+ /* DAX device, may be NULL */
+ struct dax_device *dax_dev;
+
/* fuse_dev pointer to fill in, should contain NULL on entry */
void **fudptr;
};
@@ -494,9 +516,9 @@
/**
* A Fuse connection.
*
- * This structure is created, when the filesystem is mounted, and is
- * destroyed, when the client device is closed and the filesystem is
- * unmounted.
+ * This structure is created, when the root filesystem is mounted, and
+ * is destroyed, when the client device is closed and the last
+ * fuse_mount is destroyed.
*/
struct fuse_conn {
/** Lock protecting accessess to members of this structure */
@@ -610,6 +632,9 @@
/** cache READLINK responses in page cache */
unsigned cache_symlinks:1;
+ /* show legacy mount options */
+ unsigned int legacy_opts_show:1;
+
/*
* The following bitfields are only for optimization purposes
* and hence races in setting them will not cause malfunction
@@ -717,8 +742,8 @@
/** Do not allow MNT_FORCE umount */
unsigned int no_force_umount:1;
- /* Do not show mount options */
- unsigned int no_mount_options:1;
+ /* Auto-mount submounts announced by the server */
+ unsigned int auto_submounts:1;
/** The number of requests waiting for completion */
atomic_t num_waiting;
@@ -726,10 +751,10 @@
/** Negotiated minor version */
unsigned minor;
- /** Entry on the fuse_conn_list */
+ /** Entry on the fuse_mount_list */
struct list_head entry;
- /** Device ID from super block */
+ /** Device ID from the root super block */
dev_t dev;
/** Dentries in the control filesystem */
@@ -747,24 +772,70 @@
/** Called on final put */
void (*release)(struct fuse_conn *);
- /** Super block for this connection. */
- struct super_block *sb;
-
- /** Read/write semaphore to hold when accessing sb. */
+ /**
+ * Read/write semaphore to hold when accessing the sb of any
+ * fuse_mount belonging to this connection
+ */
struct rw_semaphore killsb;
/** List of device instances belonging to this connection */
struct list_head devices;
+
+#ifdef CONFIG_FUSE_DAX
+ /* Dax specific conn data, non-NULL if DAX is enabled */
+ struct fuse_conn_dax *dax;
+#endif
+
+ /** List of filesystems using this connection */
+ struct list_head mounts;
};
-static inline struct fuse_conn *get_fuse_conn_super(struct super_block *sb)
+/*
+ * Represents a mounted filesystem, potentially a submount.
+ *
+ * This object allows sharing a fuse_conn between separate mounts to
+ * allow submounts with dedicated superblocks and thus separate device
+ * IDs.
+ */
+struct fuse_mount {
+ /* Underlying (potentially shared) connection to the FUSE server */
+ struct fuse_conn *fc;
+
+ /* Refcount */
+ refcount_t count;
+
+ /*
+ * Super block for this connection (fc->killsb must be held when
+ * accessing this).
+ */
+ struct super_block *sb;
+
+ /* Entry on fc->mounts */
+ struct list_head fc_entry;
+};
+
+static inline struct fuse_mount *get_fuse_mount_super(struct super_block *sb)
{
return sb->s_fs_info;
}
+static inline struct fuse_conn *get_fuse_conn_super(struct super_block *sb)
+{
+ struct fuse_mount *fm = get_fuse_mount_super(sb);
+
+ return fm ? fm->fc : NULL;
+}
+
+static inline struct fuse_mount *get_fuse_mount(struct inode *inode)
+{
+ return get_fuse_mount_super(inode->i_sb);
+}
+
static inline struct fuse_conn *get_fuse_conn(struct inode *inode)
{
- return get_fuse_conn_super(inode->i_sb);
+ struct fuse_mount *fm = get_fuse_mount(inode);
+
+ return fm ? fm->fc : NULL;
}
static inline struct fuse_inode *get_fuse_inode(struct inode *inode)
@@ -794,11 +865,6 @@
extern const struct dentry_operations fuse_root_dentry_operations;
/**
- * Inode to nodeid comparison.
- */
-int fuse_inode_eq(struct inode *inode, void *_nodeidp);
-
-/**
* Get a filled in inode
*/
struct inode *fuse_iget(struct super_block *sb, u64 nodeid,
@@ -848,7 +914,7 @@
*/
int fuse_open_common(struct inode *inode, struct file *file, bool isdir);
-struct fuse_file *fuse_file_alloc(struct fuse_conn *fc);
+struct fuse_file *fuse_file_alloc(struct fuse_mount *fm);
void fuse_file_free(struct fuse_file *ff);
void fuse_finish_open(struct inode *inode, struct file *file);
@@ -916,14 +982,14 @@
/**
* Simple request sending that does request allocation and freeing
*/
-ssize_t fuse_simple_request(struct fuse_conn *fc, struct fuse_args *args);
-int fuse_simple_background(struct fuse_conn *fc, struct fuse_args *args,
+ssize_t fuse_simple_request(struct fuse_mount *fm, struct fuse_args *args);
+int fuse_simple_background(struct fuse_mount *fm, struct fuse_args *args,
gfp_t gfp_flags);
/**
* End a finished request
*/
-void fuse_request_end(struct fuse_conn *fc, struct fuse_req *req);
+void fuse_request_end(struct fuse_req *req);
/* Abort all requests */
void fuse_abort_conn(struct fuse_conn *fc);
@@ -949,7 +1015,8 @@
/**
* Initialize fuse_conn
*/
-void fuse_conn_init(struct fuse_conn *fc, struct user_namespace *user_ns,
+void fuse_conn_init(struct fuse_conn *fc, struct fuse_mount *fm,
+ struct user_namespace *user_ns,
const struct fuse_iqueue_ops *fiq_ops, void *fiq_priv);
/**
@@ -957,11 +1024,21 @@
*/
void fuse_conn_put(struct fuse_conn *fc);
+/**
+ * Acquire reference to fuse_mount
+ */
+struct fuse_mount *fuse_mount_get(struct fuse_mount *fm);
+
+/**
+ * Release reference to fuse_mount
+ */
+void fuse_mount_put(struct fuse_mount *fm);
+
struct fuse_dev *fuse_dev_alloc_install(struct fuse_conn *fc);
struct fuse_dev *fuse_dev_alloc(void);
void fuse_dev_install(struct fuse_dev *fud, struct fuse_conn *fc);
void fuse_dev_free(struct fuse_dev *fud);
-void fuse_send_init(struct fuse_conn *fc);
+void fuse_send_init(struct fuse_mount *fm);
/**
* Fill in superblock and initialize fuse connection
@@ -970,12 +1047,26 @@
*/
int fuse_fill_super_common(struct super_block *sb, struct fuse_fs_context *ctx);
-/**
- * Disassociate fuse connection from superblock and kill the superblock
- *
- * Calls kill_anon_super(), do not use with bdev mounts.
+/*
+ * Fill in superblock for submounts
+ * @sb: partially-initialized superblock to fill in
+ * @parent_fi: The fuse_inode of the parent filesystem where this submount is
+ * mounted
*/
-void fuse_kill_sb_anon(struct super_block *sb);
+int fuse_fill_super_submount(struct super_block *sb,
+ struct fuse_inode *parent_fi);
+
+/*
+ * Remove the mount from the connection
+ *
+ * Returns whether this was the last mount
+ */
+bool fuse_mount_remove(struct fuse_mount *fm);
+
+/*
+ * Shut down the connection (possibly sending DESTROY request).
+ */
+void fuse_conn_destroy(struct fuse_mount *fm);
/**
* Add connection to control filesystem
@@ -1011,9 +1102,19 @@
void fuse_release_nowrite(struct inode *inode);
/**
+ * Scan all fuse_mounts belonging to fc to find the first where
+ * ilookup5() returns a result. Return that result and the
+ * respective fuse_mount in *fm (unless fm is NULL).
+ *
+ * The caller must hold fc->killsb.
+ */
+struct inode *fuse_ilookup(struct fuse_conn *fc, u64 nodeid,
+ struct fuse_mount **fm);
+
+/**
* File-system tells the kernel to invalidate cache for the given node id.
*/
-int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid,
+int fuse_reverse_inval_inode(struct fuse_conn *fc, u64 nodeid,
loff_t offset, loff_t len);
/**
@@ -1026,10 +1127,10 @@
* - is a file or oan empty directory
* then the dentry is unhashed (d_delete()).
*/
-int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
+int fuse_reverse_inval_entry(struct fuse_conn *fc, u64 parent_nodeid,
u64 child_nodeid, struct qstr *name);
-int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file,
+int fuse_do_open(struct fuse_mount *fm, u64 nodeid, struct file *file,
bool isdir);
/**
@@ -1093,4 +1194,20 @@
u64 fuse_get_unique(struct fuse_iqueue *fiq);
void fuse_free_conn(struct fuse_conn *fc);
+/* dax.c */
+
+#define FUSE_IS_DAX(inode) (IS_ENABLED(CONFIG_FUSE_DAX) && IS_DAX(inode))
+
+ssize_t fuse_dax_read_iter(struct kiocb *iocb, struct iov_iter *to);
+ssize_t fuse_dax_write_iter(struct kiocb *iocb, struct iov_iter *from);
+int fuse_dax_mmap(struct file *file, struct vm_area_struct *vma);
+int fuse_dax_break_layouts(struct inode *inode, u64 dmap_start, u64 dmap_end);
+int fuse_dax_conn_alloc(struct fuse_conn *fc, struct dax_device *dax_dev);
+void fuse_dax_conn_free(struct fuse_conn *fc);
+bool fuse_dax_inode_alloc(struct super_block *sb, struct fuse_inode *fi);
+void fuse_dax_inode_init(struct inode *inode);
+void fuse_dax_inode_cleanup(struct inode *inode);
+bool fuse_dax_check_alignment(struct fuse_conn *fc, unsigned int map_alignment);
+void fuse_dax_cancel_work(struct fuse_conn *fc);
+
#endif /* _FS_FUSE_I_H */
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 5813292..1a47afc 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -85,14 +85,22 @@
fi->orig_ino = 0;
fi->state = 0;
mutex_init(&fi->mutex);
+ init_rwsem(&fi->i_mmap_sem);
spin_lock_init(&fi->lock);
fi->forget = fuse_alloc_forget();
- if (!fi->forget) {
- kmem_cache_free(fuse_inode_cachep, fi);
- return NULL;
- }
+ if (!fi->forget)
+ goto out_free;
+
+ if (IS_ENABLED(CONFIG_FUSE_DAX) && !fuse_dax_inode_alloc(sb, fi))
+ goto out_free_forget;
return &fi->inode;
+
+out_free_forget:
+ kfree(fi->forget);
+out_free:
+ kmem_cache_free(fuse_inode_cachep, fi);
+ return NULL;
}
static void fuse_free_inode(struct inode *inode)
@@ -101,6 +109,9 @@
mutex_destroy(&fi->mutex);
kfree(fi->forget);
+#ifdef CONFIG_FUSE_DAX
+ kfree(fi->dax);
+#endif
kmem_cache_free(fuse_inode_cachep, fi);
}
@@ -112,8 +123,14 @@
clear_inode(inode);
if (inode->i_sb->s_flags & SB_ACTIVE) {
struct fuse_conn *fc = get_fuse_conn(inode);
- fuse_queue_forget(fc, fi->forget, fi->nodeid, fi->nlookup);
- fi->forget = NULL;
+
+ if (FUSE_IS_DAX(inode))
+ fuse_dax_inode_cleanup(inode);
+ if (fi->nlookup) {
+ fuse_queue_forget(fc, fi->forget, fi->nodeid,
+ fi->nlookup);
+ fi->forget = NULL;
+ }
}
if (S_ISREG(inode->i_mode) && !is_bad_inode(inode)) {
WARN_ON(!list_empty(&fi->write_files));
@@ -268,7 +285,7 @@
BUG();
}
-int fuse_inode_eq(struct inode *inode, void *_nodeidp)
+static int fuse_inode_eq(struct inode *inode, void *_nodeidp)
{
u64 nodeid = *(u64 *) _nodeidp;
if (get_node_id(inode) == nodeid)
@@ -292,7 +309,26 @@
struct fuse_inode *fi;
struct fuse_conn *fc = get_fuse_conn_super(sb);
- retry:
+ /*
+ * Auto mount points get their node id from the submount root, which is
+ * not a unique identifier within this filesystem.
+ *
+ * To avoid conflicts, do not place submount points into the inode hash
+ * table.
+ */
+ if (fc->auto_submounts && (attr->flags & FUSE_ATTR_SUBMOUNT) &&
+ S_ISDIR(attr->mode)) {
+ inode = new_inode(sb);
+ if (!inode)
+ return NULL;
+
+ fuse_init_inode(inode, attr);
+ get_fuse_inode(inode)->nodeid = nodeid;
+ inode->i_flags |= S_AUTOMOUNT;
+ goto done;
+ }
+
+retry:
inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid);
if (!inode)
return NULL;
@@ -310,7 +346,7 @@
iput(inode);
goto retry;
}
-
+done:
fi = get_fuse_inode(inode);
spin_lock(&fi->lock);
fi->nlookup++;
@@ -320,16 +356,37 @@
return inode;
}
-int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid,
+struct inode *fuse_ilookup(struct fuse_conn *fc, u64 nodeid,
+ struct fuse_mount **fm)
+{
+ struct fuse_mount *fm_iter;
+ struct inode *inode;
+
+ WARN_ON(!rwsem_is_locked(&fc->killsb));
+ list_for_each_entry(fm_iter, &fc->mounts, fc_entry) {
+ if (!fm_iter->sb)
+ continue;
+
+ inode = ilookup5(fm_iter->sb, nodeid, fuse_inode_eq, &nodeid);
+ if (inode) {
+ if (fm)
+ *fm = fm_iter;
+ return inode;
+ }
+ }
+
+ return NULL;
+}
+
+int fuse_reverse_inval_inode(struct fuse_conn *fc, u64 nodeid,
loff_t offset, loff_t len)
{
- struct fuse_conn *fc = get_fuse_conn_super(sb);
struct fuse_inode *fi;
struct inode *inode;
pgoff_t pg_start;
pgoff_t pg_end;
- inode = ilookup5(sb, nodeid, fuse_inode_eq, &nodeid);
+ inode = fuse_ilookup(fc, nodeid, NULL);
if (!inode)
return -ENOENT;
@@ -379,28 +436,23 @@
fuse_abort_conn(fc);
}
-static void fuse_send_destroy(struct fuse_conn *fc)
+static void fuse_send_destroy(struct fuse_mount *fm)
{
- if (fc->conn_init) {
+ if (fm->fc->conn_init) {
FUSE_ARGS(args);
args.opcode = FUSE_DESTROY;
args.force = true;
args.nocreds = true;
- fuse_simple_request(fc, &args);
+ fuse_simple_request(fm, &args);
}
}
static void fuse_put_super(struct super_block *sb)
{
- struct fuse_conn *fc = get_fuse_conn_super(sb);
+ struct fuse_mount *fm = get_fuse_mount_super(sb);
- mutex_lock(&fuse_mutex);
- list_del(&fc->entry);
- fuse_ctl_remove_conn(fc);
- mutex_unlock(&fuse_mutex);
-
- fuse_conn_put(fc);
+ fuse_mount_put(fm);
}
static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr)
@@ -420,12 +472,12 @@
static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf)
{
struct super_block *sb = dentry->d_sb;
- struct fuse_conn *fc = get_fuse_conn_super(sb);
+ struct fuse_mount *fm = get_fuse_mount_super(sb);
FUSE_ARGS(args);
struct fuse_statfs_out outarg;
int err;
- if (!fuse_allow_current_process(fc)) {
+ if (!fuse_allow_current_process(fm->fc)) {
buf->f_type = FUSE_SUPER_MAGIC;
return 0;
}
@@ -437,7 +489,7 @@
args.out_numargs = 1;
args.out_args[0].size = sizeof(outarg);
args.out_args[0].value = &outarg;
- err = fuse_simple_request(fc, &args);
+ err = fuse_simple_request(fm, &args);
if (!err)
convert_fuse_statfs(buf, &outarg.st);
return err;
@@ -573,19 +625,25 @@
struct super_block *sb = root->d_sb;
struct fuse_conn *fc = get_fuse_conn_super(sb);
- if (fc->no_mount_options)
- return 0;
+ if (fc->legacy_opts_show) {
+ seq_printf(m, ",user_id=%u",
+ from_kuid_munged(fc->user_ns, fc->user_id));
+ seq_printf(m, ",group_id=%u",
+ from_kgid_munged(fc->user_ns, fc->group_id));
+ if (fc->default_permissions)
+ seq_puts(m, ",default_permissions");
+ if (fc->allow_other)
+ seq_puts(m, ",allow_other");
+ if (fc->max_read != ~0)
+ seq_printf(m, ",max_read=%u", fc->max_read);
+ if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE)
+ seq_printf(m, ",blksize=%lu", sb->s_blocksize);
+ }
+#ifdef CONFIG_FUSE_DAX
+ if (fc->dax)
+ seq_puts(m, ",dax");
+#endif
- seq_printf(m, ",user_id=%u", from_kuid_munged(fc->user_ns, fc->user_id));
- seq_printf(m, ",group_id=%u", from_kgid_munged(fc->user_ns, fc->group_id));
- if (fc->default_permissions)
- seq_puts(m, ",default_permissions");
- if (fc->allow_other)
- seq_puts(m, ",allow_other");
- if (fc->max_read != ~0)
- seq_printf(m, ",max_read=%u", fc->max_read);
- if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE)
- seq_printf(m, ",blksize=%lu", sb->s_blocksize);
return 0;
}
@@ -615,7 +673,8 @@
fpq->connected = 1;
}
-void fuse_conn_init(struct fuse_conn *fc, struct user_namespace *user_ns,
+void fuse_conn_init(struct fuse_conn *fc, struct fuse_mount *fm,
+ struct user_namespace *user_ns,
const struct fuse_iqueue_ops *fiq_ops, void *fiq_priv)
{
memset(fc, 0, sizeof(*fc));
@@ -642,6 +701,11 @@
fc->pid_ns = get_pid_ns(task_active_pid_ns(current));
fc->user_ns = get_user_ns(user_ns);
fc->max_pages = FUSE_DEFAULT_MAX_PAGES_PER_REQ;
+
+ INIT_LIST_HEAD(&fc->mounts);
+ list_add(&fm->fc_entry, &fc->mounts);
+ fm->fc = fc;
+ refcount_set(&fm->count, 1);
}
EXPORT_SYMBOL_GPL(fuse_conn_init);
@@ -650,6 +714,8 @@
if (refcount_dec_and_test(&fc->count)) {
struct fuse_iqueue *fiq = &fc->iq;
+ if (IS_ENABLED(CONFIG_FUSE_DAX))
+ fuse_dax_conn_free(fc);
if (fiq->ops->release)
fiq->ops->release(fiq);
put_pid_ns(fc->pid_ns);
@@ -666,6 +732,23 @@
}
EXPORT_SYMBOL_GPL(fuse_conn_get);
+void fuse_mount_put(struct fuse_mount *fm)
+{
+ if (refcount_dec_and_test(&fm->count)) {
+ if (fm->fc)
+ fuse_conn_put(fm->fc);
+ kfree(fm);
+ }
+}
+EXPORT_SYMBOL_GPL(fuse_mount_put);
+
+struct fuse_mount *fuse_mount_get(struct fuse_mount *fm)
+{
+ refcount_inc(&fm->count);
+ return fm;
+}
+EXPORT_SYMBOL_GPL(fuse_mount_get);
+
static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode)
{
struct fuse_attr attr;
@@ -895,14 +978,16 @@
struct fuse_init_out out;
};
-static void process_init_reply(struct fuse_conn *fc, struct fuse_args *args,
+static void process_init_reply(struct fuse_mount *fm, struct fuse_args *args,
int error)
{
+ struct fuse_conn *fc = fm->fc;
struct fuse_init_args *ia = container_of(args, typeof(*ia), args);
struct fuse_init_out *arg = &ia->out;
+ bool ok = true;
if (error || arg->major != FUSE_KERNEL_VERSION)
- fc->conn_error = 1;
+ ok = false;
else {
unsigned long ra_pages;
@@ -950,11 +1035,11 @@
if (arg->flags & FUSE_HANDLE_KILLPRIV)
fc->handle_killpriv = 1;
if (arg->time_gran && arg->time_gran <= 1000000000)
- fc->sb->s_time_gran = arg->time_gran;
+ fm->sb->s_time_gran = arg->time_gran;
if ((arg->flags & FUSE_POSIX_ACL)) {
fc->default_permissions = 1;
fc->posix_acl = 1;
- fc->sb->s_xattr = fuse_acl_xattr_handlers;
+ fm->sb->s_xattr = fuse_acl_xattr_handlers;
}
if (arg->flags & FUSE_CACHE_SYMLINKS)
fc->cache_symlinks = 1;
@@ -965,14 +1050,19 @@
min_t(unsigned int, FUSE_MAX_MAX_PAGES,
max_t(unsigned int, arg->max_pages, 1));
}
+ if (IS_ENABLED(CONFIG_FUSE_DAX) &&
+ arg->flags & FUSE_MAP_ALIGNMENT &&
+ !fuse_dax_check_alignment(fc, arg->map_alignment)) {
+ ok = false;
+ }
} else {
ra_pages = fc->max_read / PAGE_SIZE;
fc->no_lock = 1;
fc->no_flock = 1;
}
- fc->sb->s_bdi->ra_pages =
- min(fc->sb->s_bdi->ra_pages, ra_pages);
+ fm->sb->s_bdi->ra_pages =
+ min(fm->sb->s_bdi->ra_pages, ra_pages);
fc->minor = arg->minor;
fc->max_write = arg->minor < 5 ? 4096 : arg->max_write;
fc->max_write = max_t(unsigned, 4096, fc->max_write);
@@ -980,11 +1070,16 @@
}
kfree(ia);
+ if (!ok) {
+ fc->conn_init = 0;
+ fc->conn_error = 1;
+ }
+
fuse_set_initialized(fc);
wake_up_all(&fc->blocked_waitq);
}
-void fuse_send_init(struct fuse_conn *fc)
+void fuse_send_init(struct fuse_mount *fm)
{
struct fuse_init_args *ia;
@@ -992,7 +1087,7 @@
ia->in.major = FUSE_KERNEL_VERSION;
ia->in.minor = FUSE_KERNEL_MINOR_VERSION;
- ia->in.max_readahead = fc->sb->s_bdi->ra_pages * PAGE_SIZE;
+ ia->in.max_readahead = fm->sb->s_bdi->ra_pages * PAGE_SIZE;
ia->in.flags |=
FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC |
FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK |
@@ -1003,6 +1098,13 @@
FUSE_PARALLEL_DIROPS | FUSE_HANDLE_KILLPRIV | FUSE_POSIX_ACL |
FUSE_ABORT_ERROR | FUSE_MAX_PAGES | FUSE_CACHE_SYMLINKS |
FUSE_NO_OPENDIR_SUPPORT | FUSE_EXPLICIT_INVAL_DATA;
+#ifdef CONFIG_FUSE_DAX
+ if (fm->fc->dax)
+ ia->in.flags |= FUSE_MAP_ALIGNMENT;
+#endif
+ if (fm->fc->auto_submounts)
+ ia->in.flags |= FUSE_SUBMOUNTS;
+
ia->args.opcode = FUSE_INIT;
ia->args.in_numargs = 1;
ia->args.in_args[0].size = sizeof(ia->in);
@@ -1018,8 +1120,8 @@
ia->args.nocreds = true;
ia->args.end = process_init_reply;
- if (fuse_simple_background(fc, &ia->args, GFP_KERNEL) != 0)
- process_init_reply(fc, &ia->args, -ENOTCONN);
+ if (fuse_simple_background(fm, &ia->args, GFP_KERNEL) != 0)
+ process_init_reply(fm, &ia->args, -ENOTCONN);
}
EXPORT_SYMBOL_GPL(fuse_send_init);
@@ -1130,10 +1232,92 @@
}
EXPORT_SYMBOL_GPL(fuse_dev_free);
+static void fuse_fill_attr_from_inode(struct fuse_attr *attr,
+ const struct fuse_inode *fi)
+{
+ *attr = (struct fuse_attr){
+ .ino = fi->inode.i_ino,
+ .size = fi->inode.i_size,
+ .blocks = fi->inode.i_blocks,
+ .atime = fi->inode.i_atime.tv_sec,
+ .mtime = fi->inode.i_mtime.tv_sec,
+ .ctime = fi->inode.i_ctime.tv_sec,
+ .atimensec = fi->inode.i_atime.tv_nsec,
+ .mtimensec = fi->inode.i_mtime.tv_nsec,
+ .ctimensec = fi->inode.i_ctime.tv_nsec,
+ .mode = fi->inode.i_mode,
+ .nlink = fi->inode.i_nlink,
+ .uid = fi->inode.i_uid.val,
+ .gid = fi->inode.i_gid.val,
+ .rdev = fi->inode.i_rdev,
+ .blksize = 1u << fi->inode.i_blkbits,
+ };
+}
+
+static void fuse_sb_defaults(struct super_block *sb)
+{
+ sb->s_magic = FUSE_SUPER_MAGIC;
+ sb->s_op = &fuse_super_operations;
+ sb->s_xattr = fuse_xattr_handlers;
+ sb->s_maxbytes = MAX_LFS_FILESIZE;
+ sb->s_time_gran = 1;
+ sb->s_export_op = &fuse_export_operations;
+ sb->s_iflags |= SB_I_IMA_UNVERIFIABLE_SIGNATURE;
+ if (sb->s_user_ns != &init_user_ns)
+ sb->s_iflags |= SB_I_UNTRUSTED_MOUNTER;
+ sb->s_flags &= ~(SB_NOSEC | SB_I_VERSION);
+
+ /*
+ * If we are not in the initial user namespace posix
+ * acls must be translated.
+ */
+ if (sb->s_user_ns != &init_user_ns)
+ sb->s_xattr = fuse_no_acl_xattr_handlers;
+}
+
+int fuse_fill_super_submount(struct super_block *sb,
+ struct fuse_inode *parent_fi)
+{
+ struct fuse_mount *fm = get_fuse_mount_super(sb);
+ struct super_block *parent_sb = parent_fi->inode.i_sb;
+ struct fuse_attr root_attr;
+ struct inode *root;
+
+ fuse_sb_defaults(sb);
+ fm->sb = sb;
+
+ WARN_ON(sb->s_bdi != &noop_backing_dev_info);
+ sb->s_bdi = bdi_get(parent_sb->s_bdi);
+
+ sb->s_xattr = parent_sb->s_xattr;
+ sb->s_time_gran = parent_sb->s_time_gran;
+ sb->s_blocksize = parent_sb->s_blocksize;
+ sb->s_blocksize_bits = parent_sb->s_blocksize_bits;
+ sb->s_subtype = kstrdup(parent_sb->s_subtype, GFP_KERNEL);
+ if (parent_sb->s_subtype && !sb->s_subtype)
+ return -ENOMEM;
+
+ fuse_fill_attr_from_inode(&root_attr, parent_fi);
+ root = fuse_iget(sb, parent_fi->nodeid, 0, &root_attr, 0, 0);
+ /*
+ * This inode is just a duplicate, so it is not looked up and
+ * its nlookup should not be incremented. fuse_iget() does
+ * that, though, so undo it here.
+ */
+ get_fuse_inode(root)->nlookup--;
+ sb->s_d_op = &fuse_dentry_operations;
+ sb->s_root = d_make_root(root);
+ if (!sb->s_root)
+ return -ENOMEM;
+
+ return 0;
+}
+
int fuse_fill_super_common(struct super_block *sb, struct fuse_fs_context *ctx)
{
struct fuse_dev *fud = NULL;
- struct fuse_conn *fc = get_fuse_conn_super(sb);
+ struct fuse_mount *fm = get_fuse_mount_super(sb);
+ struct fuse_conn *fc = fm->fc;
struct inode *root;
struct dentry *root_dentry;
int err;
@@ -1142,7 +1326,7 @@
if (sb->s_flags & SB_MANDLOCK)
goto err;
- sb->s_flags &= ~(SB_NOSEC | SB_I_VERSION);
+ fuse_sb_defaults(sb);
if (ctx->is_bdev) {
#ifdef CONFIG_BLOCK
@@ -1157,32 +1341,21 @@
sb->s_subtype = ctx->subtype;
ctx->subtype = NULL;
- sb->s_magic = FUSE_SUPER_MAGIC;
- sb->s_op = &fuse_super_operations;
- sb->s_xattr = fuse_xattr_handlers;
- sb->s_maxbytes = MAX_LFS_FILESIZE;
- sb->s_time_gran = 1;
- sb->s_export_op = &fuse_export_operations;
- sb->s_iflags |= SB_I_IMA_UNVERIFIABLE_SIGNATURE;
- if (sb->s_user_ns != &init_user_ns)
- sb->s_iflags |= SB_I_UNTRUSTED_MOUNTER;
-
- /*
- * If we are not in the initial user namespace posix
- * acls must be translated.
- */
- if (sb->s_user_ns != &init_user_ns)
- sb->s_xattr = fuse_no_acl_xattr_handlers;
+ if (IS_ENABLED(CONFIG_FUSE_DAX)) {
+ err = fuse_dax_conn_alloc(fc, ctx->dax_dev);
+ if (err)
+ goto err;
+ }
if (ctx->fudptr) {
err = -ENOMEM;
fud = fuse_dev_alloc_install(fc);
if (!fud)
- goto err;
+ goto err_free_dax;
}
fc->dev = sb->s_dev;
- fc->sb = sb;
+ fm->sb = sb;
err = fuse_bdi_init(fc, sb);
if (err)
goto err_dev_free;
@@ -1196,11 +1369,11 @@
fc->allow_other = ctx->allow_other;
fc->user_id = ctx->user_id;
fc->group_id = ctx->group_id;
- fc->max_read = max_t(unsigned, 4096, ctx->max_read);
+ fc->legacy_opts_show = ctx->legacy_opts_show;
+ fc->max_read = max_t(unsigned int, 4096, ctx->max_read);
fc->destroy = ctx->destroy;
fc->no_control = ctx->no_control;
fc->no_force_umount = ctx->no_force_umount;
- fc->no_mount_options = ctx->no_mount_options;
err = -ENOMEM;
root = fuse_get_root_inode(sb, ctx->rootmode);
@@ -1233,6 +1406,9 @@
err_dev_free:
if (fud)
fuse_dev_free(fud);
+ err_free_dax:
+ if (IS_ENABLED(CONFIG_FUSE_DAX))
+ fuse_dax_conn_free(fc);
err:
return err;
}
@@ -1244,6 +1420,7 @@
struct file *file;
int err;
struct fuse_conn *fc;
+ struct fuse_mount *fm;
err = -EINVAL;
file = fget(ctx->fd);
@@ -1264,9 +1441,16 @@
if (!fc)
goto err_fput;
- fuse_conn_init(fc, sb->s_user_ns, &fuse_dev_fiq_ops, NULL);
+ fm = kzalloc(sizeof(*fm), GFP_KERNEL);
+ if (!fm) {
+ kfree(fc);
+ goto err_fput;
+ }
+
+ fuse_conn_init(fc, fm, sb->s_user_ns, &fuse_dev_fiq_ops, NULL);
fc->release = fuse_free_conn;
- sb->s_fs_info = fc;
+
+ sb->s_fs_info = fm;
err = fuse_fill_super_common(sb, ctx);
if (err)
@@ -1277,11 +1461,11 @@
* CPUs after this
*/
fput(file);
- fuse_send_init(get_fuse_conn_super(sb));
+ fuse_send_init(get_fuse_mount_super(sb));
return 0;
err_put_conn:
- fuse_conn_put(fc);
+ fuse_mount_put(fm);
sb->s_fs_info = NULL;
err_fput:
fput(file);
@@ -1325,6 +1509,7 @@
ctx->max_read = ~0;
ctx->blksize = FUSE_DEFAULT_BLKSIZE;
+ ctx->legacy_opts_show = true;
#ifdef CONFIG_BLOCK
if (fc->fs_type == &fuseblk_fs_type) {
@@ -1338,29 +1523,52 @@
return 0;
}
-static void fuse_sb_destroy(struct super_block *sb)
+bool fuse_mount_remove(struct fuse_mount *fm)
{
- struct fuse_conn *fc = get_fuse_conn_super(sb);
+ struct fuse_conn *fc = fm->fc;
+ bool last = false;
- if (fc) {
- if (fc->destroy)
- fuse_send_destroy(fc);
+ down_write(&fc->killsb);
+ list_del_init(&fm->fc_entry);
+ if (list_empty(&fc->mounts))
+ last = true;
+ up_write(&fc->killsb);
- fuse_abort_conn(fc);
- fuse_wait_aborted(fc);
+ return last;
+}
+EXPORT_SYMBOL_GPL(fuse_mount_remove);
- down_write(&fc->killsb);
- fc->sb = NULL;
- up_write(&fc->killsb);
+void fuse_conn_destroy(struct fuse_mount *fm)
+{
+ struct fuse_conn *fc = fm->fc;
+
+ if (fc->destroy)
+ fuse_send_destroy(fm);
+
+ fuse_abort_conn(fc);
+ fuse_wait_aborted(fc);
+
+ if (!list_empty(&fc->entry)) {
+ mutex_lock(&fuse_mutex);
+ list_del(&fc->entry);
+ fuse_ctl_remove_conn(fc);
+ mutex_unlock(&fuse_mutex);
}
}
+EXPORT_SYMBOL_GPL(fuse_conn_destroy);
-void fuse_kill_sb_anon(struct super_block *sb)
+static void fuse_kill_sb_anon(struct super_block *sb)
{
- fuse_sb_destroy(sb);
+ struct fuse_mount *fm = get_fuse_mount_super(sb);
+ bool last;
+
+ if (fm) {
+ last = fuse_mount_remove(fm);
+ if (last)
+ fuse_conn_destroy(fm);
+ }
kill_anon_super(sb);
}
-EXPORT_SYMBOL_GPL(fuse_kill_sb_anon);
static struct file_system_type fuse_fs_type = {
.owner = THIS_MODULE,
@@ -1375,7 +1583,14 @@
#ifdef CONFIG_BLOCK
static void fuse_kill_sb_blk(struct super_block *sb)
{
- fuse_sb_destroy(sb);
+ struct fuse_mount *fm = get_fuse_mount_super(sb);
+ bool last;
+
+ if (fm) {
+ last = fuse_mount_remove(fm);
+ if (last)
+ fuse_conn_destroy(fm);
+ }
kill_block_super(sb);
}
diff --git a/fs/fuse/readdir.c b/fs/fuse/readdir.c
index 90e3f01..3b5e9104 100644
--- a/fs/fuse/readdir.c
+++ b/fs/fuse/readdir.c
@@ -252,7 +252,7 @@
static void fuse_force_forget(struct file *file, u64 nodeid)
{
struct inode *inode = file_inode(file);
- struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_mount *fm = get_fuse_mount(inode);
struct fuse_forget_in inarg;
FUSE_ARGS(args);
@@ -266,7 +266,7 @@
args.force = true;
args.noreply = true;
- fuse_simple_request(fc, &args);
+ fuse_simple_request(fm, &args);
/* ignore errors */
}
@@ -320,7 +320,7 @@
ssize_t res;
struct page *page;
struct inode *inode = file_inode(file);
- struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_mount *fm = get_fuse_mount(inode);
struct fuse_io_args ia = {};
struct fuse_args_pages *ap = &ia.ap;
struct fuse_page_desc desc = { .length = PAGE_SIZE };
@@ -337,7 +337,7 @@
ap->pages = &page;
ap->descs = &desc;
if (plus) {
- attr_version = fuse_get_attr_version(fc);
+ attr_version = fuse_get_attr_version(fm->fc);
fuse_read_args_fill(&ia, file, ctx->pos, PAGE_SIZE,
FUSE_READDIRPLUS);
} else {
@@ -345,7 +345,7 @@
FUSE_READDIR);
}
locked = fuse_lock_inode(inode);
- res = fuse_simple_request(fc, &ap->args);
+ res = fuse_simple_request(fm, &ap->args);
fuse_unlock_inode(inode, locked);
if (res >= 0) {
if (!res) {
diff --git a/fs/fuse/virtio_fs.c b/fs/fuse/virtio_fs.c
index 104f35d..21a9e53 100644
--- a/fs/fuse/virtio_fs.c
+++ b/fs/fuse/virtio_fs.c
@@ -5,12 +5,17 @@
*/
#include <linux/fs.h>
+#include <linux/dax.h>
+#include <linux/pci.h>
+#include <linux/pfn_t.h>
#include <linux/module.h>
#include <linux/virtio.h>
#include <linux/virtio_fs.h>
#include <linux/delay.h>
#include <linux/fs_context.h>
+#include <linux/fs_parser.h>
#include <linux/highmem.h>
+#include <linux/uio.h>
#include "fuse_i.h"
/* List of virtio-fs device instances and a lock for the list. Also provides
@@ -24,6 +29,8 @@
VQ_REQUEST
};
+#define VQ_NAME_LEN 24
+
/* Per-virtqueue state */
struct virtio_fs_vq {
spinlock_t lock;
@@ -36,7 +43,7 @@
bool connected;
long in_flight;
struct completion in_flight_zero; /* No inflight requests */
- char name[24];
+ char name[VQ_NAME_LEN];
} ____cacheline_aligned_in_smp;
/* A virtio-fs device instance */
@@ -47,6 +54,12 @@
struct virtio_fs_vq *vqs;
unsigned int nvqs; /* number of virtqueues */
unsigned int num_request_queues; /* number of request queues */
+ struct dax_device *dax_dev;
+
+ /* DAX memory window where file contents are mapped */
+ void *window_kaddr;
+ phys_addr_t window_phys_addr;
+ size_t window_len;
};
struct virtio_fs_forget_req {
@@ -69,6 +82,44 @@
static int virtio_fs_enqueue_req(struct virtio_fs_vq *fsvq,
struct fuse_req *req, bool in_flight);
+enum {
+ OPT_DAX,
+};
+
+static const struct fs_parameter_spec virtio_fs_parameters[] = {
+ fsparam_flag("dax", OPT_DAX),
+ {}
+};
+
+static int virtio_fs_parse_param(struct fs_context *fc,
+ struct fs_parameter *param)
+{
+ struct fs_parse_result result;
+ struct fuse_fs_context *ctx = fc->fs_private;
+ int opt;
+
+ opt = fs_parse(fc, virtio_fs_parameters, param, &result);
+ if (opt < 0)
+ return opt;
+
+ switch (opt) {
+ case OPT_DAX:
+ ctx->dax = 1;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static void virtio_fs_free_fc(struct fs_context *fc)
+{
+ struct fuse_fs_context *ctx = fc->fs_private;
+
+ kfree(ctx);
+}
+
static inline struct virtio_fs_vq *vq_to_fsvq(struct virtqueue *vq)
{
struct virtio_fs *fs = vq->vdev->priv;
@@ -289,7 +340,6 @@
struct fuse_req *req;
struct virtio_fs_vq *fsvq = container_of(work, struct virtio_fs_vq,
dispatch_work.work);
- struct fuse_conn *fc = fsvq->fud->fc;
int ret;
pr_debug("virtio-fs: worker %s called.\n", __func__);
@@ -304,7 +354,7 @@
list_del_init(&req->list);
spin_unlock(&fsvq->lock);
- fuse_request_end(fc, req);
+ fuse_request_end(req);
}
/* Dispatch pending requests */
@@ -335,7 +385,7 @@
spin_unlock(&fsvq->lock);
pr_err("virtio-fs: virtio_fs_enqueue_req() failed %d\n",
ret);
- fuse_request_end(fc, req);
+ fuse_request_end(req);
}
}
}
@@ -495,7 +545,6 @@
struct virtio_fs_vq *fsvq)
{
struct fuse_pqueue *fpq = &fsvq->fud->pq;
- struct fuse_conn *fc = fsvq->fud->fc;
struct fuse_args *args;
struct fuse_args_pages *ap;
unsigned int len, i, thislen;
@@ -528,7 +577,7 @@
clear_bit(FR_SENT, &req->flags);
spin_unlock(&fpq->lock);
- fuse_request_end(fc, req);
+ fuse_request_end(req);
spin_lock(&fsvq->lock);
dec_in_flight_req(fsvq);
spin_unlock(&fsvq->lock);
@@ -596,6 +645,26 @@
schedule_work(&fsvq->done_work);
}
+static void virtio_fs_init_vq(struct virtio_fs_vq *fsvq, char *name,
+ int vq_type)
+{
+ strncpy(fsvq->name, name, VQ_NAME_LEN);
+ spin_lock_init(&fsvq->lock);
+ INIT_LIST_HEAD(&fsvq->queued_reqs);
+ INIT_LIST_HEAD(&fsvq->end_reqs);
+ init_completion(&fsvq->in_flight_zero);
+
+ if (vq_type == VQ_REQUEST) {
+ INIT_WORK(&fsvq->done_work, virtio_fs_requests_done_work);
+ INIT_DELAYED_WORK(&fsvq->dispatch_work,
+ virtio_fs_request_dispatch_work);
+ } else {
+ INIT_WORK(&fsvq->done_work, virtio_fs_hiprio_done_work);
+ INIT_DELAYED_WORK(&fsvq->dispatch_work,
+ virtio_fs_hiprio_dispatch_work);
+ }
+}
+
/* Initialize virtqueues */
static int virtio_fs_setup_vqs(struct virtio_device *vdev,
struct virtio_fs *fs)
@@ -611,7 +680,7 @@
if (fs->num_request_queues == 0)
return -EINVAL;
- fs->nvqs = 1 + fs->num_request_queues;
+ fs->nvqs = VQ_REQUEST + fs->num_request_queues;
fs->vqs = kcalloc(fs->nvqs, sizeof(fs->vqs[VQ_HIPRIO]), GFP_KERNEL);
if (!fs->vqs)
return -ENOMEM;
@@ -625,29 +694,17 @@
goto out;
}
+ /* Initialize the hiprio/forget request virtqueue */
callbacks[VQ_HIPRIO] = virtio_fs_vq_done;
- snprintf(fs->vqs[VQ_HIPRIO].name, sizeof(fs->vqs[VQ_HIPRIO].name),
- "hiprio");
+ virtio_fs_init_vq(&fs->vqs[VQ_HIPRIO], "hiprio", VQ_HIPRIO);
names[VQ_HIPRIO] = fs->vqs[VQ_HIPRIO].name;
- INIT_WORK(&fs->vqs[VQ_HIPRIO].done_work, virtio_fs_hiprio_done_work);
- INIT_LIST_HEAD(&fs->vqs[VQ_HIPRIO].queued_reqs);
- INIT_LIST_HEAD(&fs->vqs[VQ_HIPRIO].end_reqs);
- INIT_DELAYED_WORK(&fs->vqs[VQ_HIPRIO].dispatch_work,
- virtio_fs_hiprio_dispatch_work);
- init_completion(&fs->vqs[VQ_HIPRIO].in_flight_zero);
- spin_lock_init(&fs->vqs[VQ_HIPRIO].lock);
/* Initialize the requests virtqueues */
for (i = VQ_REQUEST; i < fs->nvqs; i++) {
- spin_lock_init(&fs->vqs[i].lock);
- INIT_WORK(&fs->vqs[i].done_work, virtio_fs_requests_done_work);
- INIT_DELAYED_WORK(&fs->vqs[i].dispatch_work,
- virtio_fs_request_dispatch_work);
- INIT_LIST_HEAD(&fs->vqs[i].queued_reqs);
- INIT_LIST_HEAD(&fs->vqs[i].end_reqs);
- init_completion(&fs->vqs[i].in_flight_zero);
- snprintf(fs->vqs[i].name, sizeof(fs->vqs[i].name),
- "requests.%u", i - VQ_REQUEST);
+ char vq_name[VQ_NAME_LEN];
+
+ snprintf(vq_name, VQ_NAME_LEN, "requests.%u", i - VQ_REQUEST);
+ virtio_fs_init_vq(&fs->vqs[i], vq_name, VQ_REQUEST);
callbacks[i] = virtio_fs_vq_done;
names[i] = fs->vqs[i].name;
}
@@ -676,6 +733,130 @@
vdev->config->del_vqs(vdev);
}
+/* Map a window offset to a page frame number. The window offset will have
+ * been produced by .iomap_begin(), which maps a file offset to a window
+ * offset.
+ */
+static long virtio_fs_direct_access(struct dax_device *dax_dev, pgoff_t pgoff,
+ long nr_pages, void **kaddr, pfn_t *pfn)
+{
+ struct virtio_fs *fs = dax_get_private(dax_dev);
+ phys_addr_t offset = PFN_PHYS(pgoff);
+ size_t max_nr_pages = fs->window_len/PAGE_SIZE - pgoff;
+
+ if (kaddr)
+ *kaddr = fs->window_kaddr + offset;
+ if (pfn)
+ *pfn = phys_to_pfn_t(fs->window_phys_addr + offset,
+ PFN_DEV | PFN_MAP);
+ return nr_pages > max_nr_pages ? max_nr_pages : nr_pages;
+}
+
+static size_t virtio_fs_copy_from_iter(struct dax_device *dax_dev,
+ pgoff_t pgoff, void *addr,
+ size_t bytes, struct iov_iter *i)
+{
+ return copy_from_iter(addr, bytes, i);
+}
+
+static size_t virtio_fs_copy_to_iter(struct dax_device *dax_dev,
+ pgoff_t pgoff, void *addr,
+ size_t bytes, struct iov_iter *i)
+{
+ return copy_to_iter(addr, bytes, i);
+}
+
+static int virtio_fs_zero_page_range(struct dax_device *dax_dev,
+ pgoff_t pgoff, size_t nr_pages)
+{
+ long rc;
+ void *kaddr;
+
+ rc = dax_direct_access(dax_dev, pgoff, nr_pages, &kaddr, NULL);
+ if (rc < 0)
+ return rc;
+ memset(kaddr, 0, nr_pages << PAGE_SHIFT);
+ dax_flush(dax_dev, kaddr, nr_pages << PAGE_SHIFT);
+ return 0;
+}
+
+static const struct dax_operations virtio_fs_dax_ops = {
+ .direct_access = virtio_fs_direct_access,
+ .copy_from_iter = virtio_fs_copy_from_iter,
+ .copy_to_iter = virtio_fs_copy_to_iter,
+ .zero_page_range = virtio_fs_zero_page_range,
+};
+
+static void virtio_fs_cleanup_dax(void *data)
+{
+ struct dax_device *dax_dev = data;
+
+ kill_dax(dax_dev);
+ put_dax(dax_dev);
+}
+
+static int virtio_fs_setup_dax(struct virtio_device *vdev, struct virtio_fs *fs)
+{
+ struct virtio_shm_region cache_reg;
+ struct dev_pagemap *pgmap;
+ bool have_cache;
+
+ if (!IS_ENABLED(CONFIG_FUSE_DAX))
+ return 0;
+
+ /* Get cache region */
+ have_cache = virtio_get_shm_region(vdev, &cache_reg,
+ (u8)VIRTIO_FS_SHMCAP_ID_CACHE);
+ if (!have_cache) {
+ dev_notice(&vdev->dev, "%s: No cache capability\n", __func__);
+ return 0;
+ }
+
+ if (!devm_request_mem_region(&vdev->dev, cache_reg.addr, cache_reg.len,
+ dev_name(&vdev->dev))) {
+ dev_warn(&vdev->dev, "could not reserve region addr=0x%llx len=0x%llx\n",
+ cache_reg.addr, cache_reg.len);
+ return -EBUSY;
+ }
+
+ dev_notice(&vdev->dev, "Cache len: 0x%llx @ 0x%llx\n", cache_reg.len,
+ cache_reg.addr);
+
+ pgmap = devm_kzalloc(&vdev->dev, sizeof(*pgmap), GFP_KERNEL);
+ if (!pgmap)
+ return -ENOMEM;
+
+ pgmap->type = MEMORY_DEVICE_FS_DAX;
+
+ /* Ideally we would directly use the PCI BAR resource but
+ * devm_memremap_pages() wants its own copy in pgmap. So
+ * initialize a struct resource from scratch (only the start
+ * and end fields will be used).
+ */
+ pgmap->range = (struct range) {
+ .start = (phys_addr_t) cache_reg.addr,
+ .end = (phys_addr_t) cache_reg.addr + cache_reg.len - 1,
+ };
+ pgmap->nr_range = 1;
+
+ fs->window_kaddr = devm_memremap_pages(&vdev->dev, pgmap);
+ if (IS_ERR(fs->window_kaddr))
+ return PTR_ERR(fs->window_kaddr);
+
+ fs->window_phys_addr = (phys_addr_t) cache_reg.addr;
+ fs->window_len = (phys_addr_t) cache_reg.len;
+
+ dev_dbg(&vdev->dev, "%s: window kaddr 0x%px phys_addr 0x%llx len 0x%llx\n",
+ __func__, fs->window_kaddr, cache_reg.addr, cache_reg.len);
+
+ fs->dax_dev = alloc_dax(fs, NULL, &virtio_fs_dax_ops, 0);
+ if (IS_ERR(fs->dax_dev))
+ return PTR_ERR(fs->dax_dev);
+
+ return devm_add_action_or_reset(&vdev->dev, virtio_fs_cleanup_dax,
+ fs->dax_dev);
+}
+
static int virtio_fs_probe(struct virtio_device *vdev)
{
struct virtio_fs *fs;
@@ -697,6 +878,10 @@
/* TODO vq affinity */
+ ret = virtio_fs_setup_dax(vdev, fs);
+ if (ret < 0)
+ goto out_vqs;
+
/* Bring the device online in case the filesystem is mounted and
* requests need to be sent before we return.
*/
@@ -833,18 +1018,37 @@
spin_unlock(&fiq->lock);
}
+/* Count number of scatter-gather elements required */
+static unsigned int sg_count_fuse_pages(struct fuse_page_desc *page_descs,
+ unsigned int num_pages,
+ unsigned int total_len)
+{
+ unsigned int i;
+ unsigned int this_len;
+
+ for (i = 0; i < num_pages && total_len; i++) {
+ this_len = min(page_descs[i].length, total_len);
+ total_len -= this_len;
+ }
+
+ return i;
+}
+
/* Return the number of scatter-gather list elements required */
static unsigned int sg_count_fuse_req(struct fuse_req *req)
{
struct fuse_args *args = req->args;
struct fuse_args_pages *ap = container_of(args, typeof(*ap), args);
- unsigned int total_sgs = 1 /* fuse_in_header */;
+ unsigned int size, total_sgs = 1 /* fuse_in_header */;
if (args->in_numargs - args->in_pages)
total_sgs += 1;
- if (args->in_pages)
- total_sgs += ap->num_pages;
+ if (args->in_pages) {
+ size = args->in_args[args->in_numargs - 1].size;
+ total_sgs += sg_count_fuse_pages(ap->descs, ap->num_pages,
+ size);
+ }
if (!test_bit(FR_ISREPLY, &req->flags))
return total_sgs;
@@ -854,8 +1058,11 @@
if (args->out_numargs - args->out_pages)
total_sgs += 1;
- if (args->out_pages)
- total_sgs += ap->num_pages;
+ if (args->out_pages) {
+ size = args->out_args[args->out_numargs - 1].size;
+ total_sgs += sg_count_fuse_pages(ap->descs, ap->num_pages,
+ size);
+ }
return total_sgs;
}
@@ -1071,24 +1278,28 @@
.release = virtio_fs_fiq_release,
};
-static int virtio_fs_fill_super(struct super_block *sb)
+static inline void virtio_fs_ctx_set_defaults(struct fuse_fs_context *ctx)
{
- struct fuse_conn *fc = get_fuse_conn_super(sb);
+ ctx->rootmode = S_IFDIR;
+ ctx->default_permissions = 1;
+ ctx->allow_other = 1;
+ ctx->max_read = UINT_MAX;
+ ctx->blksize = 512;
+ ctx->destroy = true;
+ ctx->no_control = true;
+ ctx->no_force_umount = true;
+}
+
+static int virtio_fs_fill_super(struct super_block *sb, struct fs_context *fsc)
+{
+ struct fuse_mount *fm = get_fuse_mount_super(sb);
+ struct fuse_conn *fc = fm->fc;
struct virtio_fs *fs = fc->iq.priv;
+ struct fuse_fs_context *ctx = fsc->fs_private;
unsigned int i;
int err;
- struct fuse_fs_context ctx = {
- .rootmode = S_IFDIR,
- .default_permissions = 1,
- .allow_other = 1,
- .max_read = UINT_MAX,
- .blksize = 512,
- .destroy = true,
- .no_control = true,
- .no_force_umount = true,
- .no_mount_options = true,
- };
+ virtio_fs_ctx_set_defaults(ctx);
mutex_lock(&virtio_fs_mutex);
/* After holding mutex, make sure virtiofs device is still there.
@@ -1112,8 +1323,10 @@
}
/* virtiofs allocates and installs its own fuse devices */
- ctx.fudptr = NULL;
- err = fuse_fill_super_common(sb, &ctx);
+ ctx->fudptr = NULL;
+ if (ctx->dax)
+ ctx->dax_dev = fs->dax_dev;
+ err = fuse_fill_super_common(sb, ctx);
if (err < 0)
goto err_free_fuse_devs;
@@ -1125,7 +1338,7 @@
/* Previous unmount will stop all queues. Start these again */
virtio_fs_start_all_queues(fs);
- fuse_send_init(fc);
+ fuse_send_init(fm);
mutex_unlock(&virtio_fs_mutex);
return 0;
@@ -1136,18 +1349,17 @@
return err;
}
-static void virtio_kill_sb(struct super_block *sb)
+static void virtio_fs_conn_destroy(struct fuse_mount *fm)
{
- struct fuse_conn *fc = get_fuse_conn_super(sb);
- struct virtio_fs *vfs;
- struct virtio_fs_vq *fsvq;
+ struct fuse_conn *fc = fm->fc;
+ struct virtio_fs *vfs = fc->iq.priv;
+ struct virtio_fs_vq *fsvq = &vfs->vqs[VQ_HIPRIO];
- /* If mount failed, we can still be called without any fc */
- if (!fc)
- return fuse_kill_sb_anon(sb);
-
- vfs = fc->iq.priv;
- fsvq = &vfs->vqs[VQ_HIPRIO];
+ /* Stop dax worker. Soon evict_inodes() will be called which
+ * will free all memory ranges belonging to all inodes.
+ */
+ if (IS_ENABLED(CONFIG_FUSE_DAX))
+ fuse_dax_cancel_work(fc);
/* Stop forget queue. Soon destroy will be sent */
spin_lock(&fsvq->lock);
@@ -1155,9 +1367,9 @@
spin_unlock(&fsvq->lock);
virtio_fs_drain_all_queues(vfs);
- fuse_kill_sb_anon(sb);
+ fuse_conn_destroy(fm);
- /* fuse_kill_sb_anon() must have sent destroy. Stop all queues
+ /* fuse_conn_destroy() must have sent destroy. Stop all queues
* and drain one more time and free fuse devices. Freeing fuse
* devices will drop their reference on fuse_conn and that in
* turn will drop its reference on virtio_fs object.
@@ -1167,12 +1379,27 @@
virtio_fs_free_devs(vfs);
}
+static void virtio_kill_sb(struct super_block *sb)
+{
+ struct fuse_mount *fm = get_fuse_mount_super(sb);
+ bool last;
+
+ /* If mount failed, we can still be called without any fc */
+ if (fm) {
+ last = fuse_mount_remove(fm);
+ if (last)
+ virtio_fs_conn_destroy(fm);
+ }
+ kill_anon_super(sb);
+}
+
static int virtio_fs_test_super(struct super_block *sb,
struct fs_context *fsc)
{
- struct fuse_conn *fc = fsc->s_fs_info;
+ struct fuse_mount *fsc_fm = fsc->s_fs_info;
+ struct fuse_mount *sb_fm = get_fuse_mount_super(sb);
- return fc->iq.priv == get_fuse_conn_super(sb)->iq.priv;
+ return fsc_fm->fc->iq.priv == sb_fm->fc->iq.priv;
}
static int virtio_fs_set_super(struct super_block *sb,
@@ -1182,7 +1409,7 @@
err = get_anon_bdev(&sb->s_dev);
if (!err)
- fuse_conn_get(fsc->s_fs_info);
+ fuse_mount_get(fsc->s_fs_info);
return err;
}
@@ -1192,6 +1419,7 @@
struct virtio_fs *fs;
struct super_block *sb;
struct fuse_conn *fc;
+ struct fuse_mount *fm;
int err;
/* This gets a reference on virtio_fs object. This ptr gets installed
@@ -1212,19 +1440,29 @@
return -ENOMEM;
}
- fuse_conn_init(fc, get_user_ns(current_user_ns()), &virtio_fs_fiq_ops,
- fs);
+ fm = kzalloc(sizeof(struct fuse_mount), GFP_KERNEL);
+ if (!fm) {
+ mutex_lock(&virtio_fs_mutex);
+ virtio_fs_put(fs);
+ mutex_unlock(&virtio_fs_mutex);
+ kfree(fc);
+ return -ENOMEM;
+ }
+
+ fuse_conn_init(fc, fm, get_user_ns(current_user_ns()),
+ &virtio_fs_fiq_ops, fs);
fc->release = fuse_free_conn;
fc->delete_stale = true;
+ fc->auto_submounts = true;
- fsc->s_fs_info = fc;
+ fsc->s_fs_info = fm;
sb = sget_fc(fsc, virtio_fs_test_super, virtio_fs_set_super);
- fuse_conn_put(fc);
+ fuse_mount_put(fm);
if (IS_ERR(sb))
return PTR_ERR(sb);
if (!sb->s_root) {
- err = virtio_fs_fill_super(sb);
+ err = virtio_fs_fill_super(sb, fsc);
if (err) {
deactivate_locked_super(sb);
return err;
@@ -1239,11 +1477,19 @@
}
static const struct fs_context_operations virtio_fs_context_ops = {
+ .free = virtio_fs_free_fc,
+ .parse_param = virtio_fs_parse_param,
.get_tree = virtio_fs_get_tree,
};
static int virtio_fs_init_fs_context(struct fs_context *fsc)
{
+ struct fuse_fs_context *ctx;
+
+ ctx = kzalloc(sizeof(struct fuse_fs_context), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+ fsc->fs_private = ctx;
fsc->ops = &virtio_fs_context_ops;
return 0;
}
diff --git a/fs/fuse/xattr.c b/fs/fuse/xattr.c
index 20d052e..371bdcb 100644
--- a/fs/fuse/xattr.c
+++ b/fs/fuse/xattr.c
@@ -14,12 +14,12 @@
int fuse_setxattr(struct inode *inode, const char *name, const void *value,
size_t size, int flags)
{
- struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_mount *fm = get_fuse_mount(inode);
FUSE_ARGS(args);
struct fuse_setxattr_in inarg;
int err;
- if (fc->no_setxattr)
+ if (fm->fc->no_setxattr)
return -EOPNOTSUPP;
memset(&inarg, 0, sizeof(inarg));
@@ -34,9 +34,9 @@
args.in_args[1].value = name;
args.in_args[2].size = size;
args.in_args[2].value = value;
- err = fuse_simple_request(fc, &args);
+ err = fuse_simple_request(fm, &args);
if (err == -ENOSYS) {
- fc->no_setxattr = 1;
+ fm->fc->no_setxattr = 1;
err = -EOPNOTSUPP;
}
if (!err) {
@@ -49,13 +49,13 @@
ssize_t fuse_getxattr(struct inode *inode, const char *name, void *value,
size_t size)
{
- struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_mount *fm = get_fuse_mount(inode);
FUSE_ARGS(args);
struct fuse_getxattr_in inarg;
struct fuse_getxattr_out outarg;
ssize_t ret;
- if (fc->no_getxattr)
+ if (fm->fc->no_getxattr)
return -EOPNOTSUPP;
memset(&inarg, 0, sizeof(inarg));
@@ -77,11 +77,11 @@
args.out_args[0].size = sizeof(outarg);
args.out_args[0].value = &outarg;
}
- ret = fuse_simple_request(fc, &args);
+ ret = fuse_simple_request(fm, &args);
if (!ret && !size)
ret = min_t(ssize_t, outarg.size, XATTR_SIZE_MAX);
if (ret == -ENOSYS) {
- fc->no_getxattr = 1;
+ fm->fc->no_getxattr = 1;
ret = -EOPNOTSUPP;
}
return ret;
@@ -107,16 +107,16 @@
ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size)
{
struct inode *inode = d_inode(entry);
- struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_mount *fm = get_fuse_mount(inode);
FUSE_ARGS(args);
struct fuse_getxattr_in inarg;
struct fuse_getxattr_out outarg;
ssize_t ret;
- if (!fuse_allow_current_process(fc))
+ if (!fuse_allow_current_process(fm->fc))
return -EACCES;
- if (fc->no_listxattr)
+ if (fm->fc->no_listxattr)
return -EOPNOTSUPP;
memset(&inarg, 0, sizeof(inarg));
@@ -136,13 +136,13 @@
args.out_args[0].size = sizeof(outarg);
args.out_args[0].value = &outarg;
}
- ret = fuse_simple_request(fc, &args);
+ ret = fuse_simple_request(fm, &args);
if (!ret && !size)
ret = min_t(ssize_t, outarg.size, XATTR_LIST_MAX);
if (ret > 0 && size)
ret = fuse_verify_xattr_list(list, ret);
if (ret == -ENOSYS) {
- fc->no_listxattr = 1;
+ fm->fc->no_listxattr = 1;
ret = -EOPNOTSUPP;
}
return ret;
@@ -150,11 +150,11 @@
int fuse_removexattr(struct inode *inode, const char *name)
{
- struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_mount *fm = get_fuse_mount(inode);
FUSE_ARGS(args);
int err;
- if (fc->no_removexattr)
+ if (fm->fc->no_removexattr)
return -EOPNOTSUPP;
args.opcode = FUSE_REMOVEXATTR;
@@ -162,9 +162,9 @@
args.in_numargs = 1;
args.in_args[0].size = strlen(name) + 1;
args.in_args[0].value = name;
- err = fuse_simple_request(fc, &args);
+ err = fuse_simple_request(fm, &args);
if (err == -ENOSYS) {
- fc->no_removexattr = 1;
+ fm->fc->no_removexattr = 1;
err = -EOPNOTSUPP;
}
if (!err) {
diff --git a/include/linux/dax.h b/include/linux/dax.h
index e153572..b52f084 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -149,6 +149,7 @@
struct dax_device *dax_dev, struct writeback_control *wbc);
struct page *dax_layout_busy_page(struct address_space *mapping);
+struct page *dax_layout_busy_page_range(struct address_space *mapping, loff_t start, loff_t end);
dax_entry_t dax_lock_page(struct page *page);
void dax_unlock_page(struct page *page, dax_entry_t cookie);
#else
@@ -179,6 +180,11 @@
return NULL;
}
+static inline struct page *dax_layout_busy_page_range(struct address_space *mapping, pgoff_t start, pgoff_t nr_pages)
+{
+ return NULL;
+}
+
static inline int dax_writeback_mapping_range(struct address_space *mapping,
struct dax_device *dax_dev, struct writeback_control *wbc)
{
diff --git a/include/uapi/linux/fuse.h b/include/uapi/linux/fuse.h
index 373cada..7233502 100644
--- a/include/uapi/linux/fuse.h
+++ b/include/uapi/linux/fuse.h
@@ -172,6 +172,9 @@
* - add FUSE_WRITE_KILL_PRIV flag
* - add FUSE_SETUPMAPPING and FUSE_REMOVEMAPPING
* - add map_alignment to fuse_init_out, add FUSE_MAP_ALIGNMENT flag
+ *
+ * 7.32
+ * - add flags to fuse_attr, add FUSE_ATTR_SUBMOUNT, add FUSE_SUBMOUNTS
*/
#ifndef _LINUX_FUSE_H
@@ -207,7 +210,7 @@
#define FUSE_KERNEL_VERSION 7
/** Minor version number of this interface */
-#define FUSE_KERNEL_MINOR_VERSION 31
+#define FUSE_KERNEL_MINOR_VERSION 32
/** The node ID of the root inode */
#define FUSE_ROOT_ID 1
@@ -231,7 +234,7 @@
uint32_t gid;
uint32_t rdev;
uint32_t blksize;
- uint32_t padding;
+ uint32_t flags;
};
struct fuse_kstatfs {
@@ -313,7 +316,10 @@
* FUSE_CACHE_SYMLINKS: cache READLINK responses
* FUSE_NO_OPENDIR_SUPPORT: kernel supports zero-message opendir
* FUSE_EXPLICIT_INVAL_DATA: only invalidate cached pages on explicit request
- * FUSE_MAP_ALIGNMENT: map_alignment field is valid
+ * FUSE_MAP_ALIGNMENT: init_out.map_alignment contains log2(byte alignment) for
+ * foffset and moffset fields in struct
+ * fuse_setupmapping_out and fuse_removemapping_one.
+ * FUSE_SUBMOUNTS: kernel supports auto-mounting directory submounts
*/
#define FUSE_ASYNC_READ (1 << 0)
#define FUSE_POSIX_LOCKS (1 << 1)
@@ -342,6 +348,7 @@
#define FUSE_NO_OPENDIR_SUPPORT (1 << 24)
#define FUSE_EXPLICIT_INVAL_DATA (1 << 25)
#define FUSE_MAP_ALIGNMENT (1 << 26)
+#define FUSE_SUBMOUNTS (1 << 27)
/**
* CUSE INIT request/reply flags
@@ -417,6 +424,13 @@
*/
#define FUSE_FSYNC_FDATASYNC (1 << 0)
+/**
+ * fuse_attr flags
+ *
+ * FUSE_ATTR_SUBMOUNT: Object is a submount root
+ */
+#define FUSE_ATTR_SUBMOUNT (1 << 0)
+
enum fuse_opcode {
FUSE_LOOKUP = 1,
FUSE_FORGET = 2, /* no reply */
@@ -892,4 +906,34 @@
uint64_t flags;
};
+#define FUSE_SETUPMAPPING_FLAG_WRITE (1ull << 0)
+#define FUSE_SETUPMAPPING_FLAG_READ (1ull << 1)
+struct fuse_setupmapping_in {
+ /* An already open handle */
+ uint64_t fh;
+ /* Offset into the file to start the mapping */
+ uint64_t foffset;
+ /* Length of mapping required */
+ uint64_t len;
+ /* Flags, FUSE_SETUPMAPPING_FLAG_* */
+ uint64_t flags;
+ /* Offset in Memory Window */
+ uint64_t moffset;
+};
+
+struct fuse_removemapping_in {
+ /* number of fuse_removemapping_one follows */
+ uint32_t count;
+};
+
+struct fuse_removemapping_one {
+ /* Offset into the dax window start the unmapping */
+ uint64_t moffset;
+ /* Length of mapping required */
+ uint64_t len;
+};
+
+#define FUSE_REMOVEMAPPING_MAX_ENTRY \
+ (PAGE_SIZE / sizeof(struct fuse_removemapping_one))
+
#endif /* _LINUX_FUSE_H */
diff --git a/include/uapi/linux/virtio_fs.h b/include/uapi/linux/virtio_fs.h
index 3056b6e..bea3829 100644
--- a/include/uapi/linux/virtio_fs.h
+++ b/include/uapi/linux/virtio_fs.h
@@ -16,4 +16,7 @@
__le32 num_request_queues;
} __attribute__((packed));
+/* For the id field in virtio_pci_shm_cap */
+#define VIRTIO_FS_SHMCAP_ID_CACHE 0
+
#endif /* _UAPI_LINUX_VIRTIO_FS_H */
