blob: 4b8d59ebda00922bcef14c05561af7559a0e8676 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
#include <linux/ceph/ceph_debug.h>
#include <linux/ceph/striper.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/file.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/writeback.h>
#include <linux/falloc.h>
#include <linux/iversion.h>
#include <linux/ktime.h>
#include <linux/splice.h>
#include "super.h"
#include "mds_client.h"
#include "cache.h"
#include "io.h"
#include "metric.h"
static __le32 ceph_flags_sys2wire(struct ceph_mds_client *mdsc, u32 flags)
{
struct ceph_client *cl = mdsc->fsc->client;
u32 wire_flags = 0;
switch (flags & O_ACCMODE) {
case O_RDONLY:
wire_flags |= CEPH_O_RDONLY;
break;
case O_WRONLY:
wire_flags |= CEPH_O_WRONLY;
break;
case O_RDWR:
wire_flags |= CEPH_O_RDWR;
break;
}
flags &= ~O_ACCMODE;
#define ceph_sys2wire(a) if (flags & a) { wire_flags |= CEPH_##a; flags &= ~a; }
ceph_sys2wire(O_CREAT);
ceph_sys2wire(O_EXCL);
ceph_sys2wire(O_TRUNC);
ceph_sys2wire(O_DIRECTORY);
ceph_sys2wire(O_NOFOLLOW);
#undef ceph_sys2wire
if (flags)
doutc(cl, "unused open flags: %x\n", flags);
return cpu_to_le32(wire_flags);
}
/*
* Ceph file operations
*
* Implement basic open/close functionality, and implement
* read/write.
*
* We implement three modes of file I/O:
* - buffered uses the generic_file_aio_{read,write} helpers
*
* - synchronous is used when there is multi-client read/write
* sharing, avoids the page cache, and synchronously waits for an
* ack from the OSD.
*
* - direct io takes the variant of the sync path that references
* user pages directly.
*
* fsync() flushes and waits on dirty pages, but just queues metadata
* for writeback: since the MDS can recover size and mtime there is no
* need to wait for MDS acknowledgement.
*/
/*
* How many pages to get in one call to iov_iter_get_pages(). This
* determines the size of the on-stack array used as a buffer.
*/
#define ITER_GET_BVECS_PAGES 64
static ssize_t __iter_get_bvecs(struct iov_iter *iter, size_t maxsize,
struct bio_vec *bvecs)
{
size_t size = 0;
int bvec_idx = 0;
if (maxsize > iov_iter_count(iter))
maxsize = iov_iter_count(iter);
while (size < maxsize) {
struct page *pages[ITER_GET_BVECS_PAGES];
ssize_t bytes;
size_t start;
int idx = 0;
bytes = iov_iter_get_pages2(iter, pages, maxsize - size,
ITER_GET_BVECS_PAGES, &start);
if (bytes < 0)
return size ?: bytes;
size += bytes;
for ( ; bytes; idx++, bvec_idx++) {
int len = min_t(int, bytes, PAGE_SIZE - start);
bvec_set_page(&bvecs[bvec_idx], pages[idx], len, start);
bytes -= len;
start = 0;
}
}
return size;
}
/*
* iov_iter_get_pages() only considers one iov_iter segment, no matter
* what maxsize or maxpages are given. For ITER_BVEC that is a single
* page.
*
* Attempt to get up to @maxsize bytes worth of pages from @iter.
* Return the number of bytes in the created bio_vec array, or an error.
*/
static ssize_t iter_get_bvecs_alloc(struct iov_iter *iter, size_t maxsize,
struct bio_vec **bvecs, int *num_bvecs)
{
struct bio_vec *bv;
size_t orig_count = iov_iter_count(iter);
ssize_t bytes;
int npages;
iov_iter_truncate(iter, maxsize);
npages = iov_iter_npages(iter, INT_MAX);
iov_iter_reexpand(iter, orig_count);
/*
* __iter_get_bvecs() may populate only part of the array -- zero it
* out.
*/
bv = kvmalloc_array(npages, sizeof(*bv), GFP_KERNEL | __GFP_ZERO);
if (!bv)
return -ENOMEM;
bytes = __iter_get_bvecs(iter, maxsize, bv);
if (bytes < 0) {
/*
* No pages were pinned -- just free the array.
*/
kvfree(bv);
return bytes;
}
*bvecs = bv;
*num_bvecs = npages;
return bytes;
}
static void put_bvecs(struct bio_vec *bvecs, int num_bvecs, bool should_dirty)
{
int i;
for (i = 0; i < num_bvecs; i++) {
if (bvecs[i].bv_page) {
if (should_dirty)
set_page_dirty_lock(bvecs[i].bv_page);
put_page(bvecs[i].bv_page);
}
}
kvfree(bvecs);
}
/*
* Prepare an open request. Preallocate ceph_cap to avoid an
* inopportune ENOMEM later.
*/
static struct ceph_mds_request *
prepare_open_request(struct super_block *sb, int flags, int create_mode)
{
struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(sb);
struct ceph_mds_request *req;
int want_auth = USE_ANY_MDS;
int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN;
if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC))
want_auth = USE_AUTH_MDS;
req = ceph_mdsc_create_request(mdsc, op, want_auth);
if (IS_ERR(req))
goto out;
req->r_fmode = ceph_flags_to_mode(flags);
req->r_args.open.flags = ceph_flags_sys2wire(mdsc, flags);
req->r_args.open.mode = cpu_to_le32(create_mode);
out:
return req;
}
static int ceph_init_file_info(struct inode *inode, struct file *file,
int fmode, bool isdir)
{
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_mount_options *opt =
ceph_inode_to_fs_client(&ci->netfs.inode)->mount_options;
struct ceph_client *cl = ceph_inode_to_client(inode);
struct ceph_file_info *fi;
int ret;
doutc(cl, "%p %llx.%llx %p 0%o (%s)\n", inode, ceph_vinop(inode),
file, inode->i_mode, isdir ? "dir" : "regular");
BUG_ON(inode->i_fop->release != ceph_release);
if (isdir) {
struct ceph_dir_file_info *dfi =
kmem_cache_zalloc(ceph_dir_file_cachep, GFP_KERNEL);
if (!dfi)
return -ENOMEM;
file->private_data = dfi;
fi = &dfi->file_info;
dfi->next_offset = 2;
dfi->readdir_cache_idx = -1;
} else {
fi = kmem_cache_zalloc(ceph_file_cachep, GFP_KERNEL);
if (!fi)
return -ENOMEM;
if (opt->flags & CEPH_MOUNT_OPT_NOPAGECACHE)
fi->flags |= CEPH_F_SYNC;
file->private_data = fi;
}
ceph_get_fmode(ci, fmode, 1);
fi->fmode = fmode;
spin_lock_init(&fi->rw_contexts_lock);
INIT_LIST_HEAD(&fi->rw_contexts);
fi->filp_gen = READ_ONCE(ceph_inode_to_fs_client(inode)->filp_gen);
if ((file->f_mode & FMODE_WRITE) && ceph_has_inline_data(ci)) {
ret = ceph_uninline_data(file);
if (ret < 0)
goto error;
}
return 0;
error:
ceph_fscache_unuse_cookie(inode, file->f_mode & FMODE_WRITE);
ceph_put_fmode(ci, fi->fmode, 1);
kmem_cache_free(ceph_file_cachep, fi);
/* wake up anyone waiting for caps on this inode */
wake_up_all(&ci->i_cap_wq);
return ret;
}
/*
* initialize private struct file data.
* if we fail, clean up by dropping fmode reference on the ceph_inode
*/
static int ceph_init_file(struct inode *inode, struct file *file, int fmode)
{
struct ceph_client *cl = ceph_inode_to_client(inode);
int ret = 0;
switch (inode->i_mode & S_IFMT) {
case S_IFREG:
ceph_fscache_use_cookie(inode, file->f_mode & FMODE_WRITE);
fallthrough;
case S_IFDIR:
ret = ceph_init_file_info(inode, file, fmode,
S_ISDIR(inode->i_mode));
break;
case S_IFLNK:
doutc(cl, "%p %llx.%llx %p 0%o (symlink)\n", inode,
ceph_vinop(inode), file, inode->i_mode);
break;
default:
doutc(cl, "%p %llx.%llx %p 0%o (special)\n", inode,
ceph_vinop(inode), file, inode->i_mode);
/*
* we need to drop the open ref now, since we don't
* have .release set to ceph_release.
*/
BUG_ON(inode->i_fop->release == ceph_release);
/* call the proper open fop */
ret = inode->i_fop->open(inode, file);
}
return ret;
}
/*
* try renew caps after session gets killed.
*/
int ceph_renew_caps(struct inode *inode, int fmode)
{
struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
struct ceph_client *cl = mdsc->fsc->client;
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_mds_request *req;
int err, flags, wanted;
spin_lock(&ci->i_ceph_lock);
__ceph_touch_fmode(ci, mdsc, fmode);
wanted = __ceph_caps_file_wanted(ci);
if (__ceph_is_any_real_caps(ci) &&
(!(wanted & CEPH_CAP_ANY_WR) || ci->i_auth_cap)) {
int issued = __ceph_caps_issued(ci, NULL);
spin_unlock(&ci->i_ceph_lock);
doutc(cl, "%p %llx.%llx want %s issued %s updating mds_wanted\n",
inode, ceph_vinop(inode), ceph_cap_string(wanted),
ceph_cap_string(issued));
ceph_check_caps(ci, 0);
return 0;
}
spin_unlock(&ci->i_ceph_lock);
flags = 0;
if ((wanted & CEPH_CAP_FILE_RD) && (wanted & CEPH_CAP_FILE_WR))
flags = O_RDWR;
else if (wanted & CEPH_CAP_FILE_RD)
flags = O_RDONLY;
else if (wanted & CEPH_CAP_FILE_WR)
flags = O_WRONLY;
#ifdef O_LAZY
if (wanted & CEPH_CAP_FILE_LAZYIO)
flags |= O_LAZY;
#endif
req = prepare_open_request(inode->i_sb, flags, 0);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto out;
}
req->r_inode = inode;
ihold(inode);
req->r_num_caps = 1;
err = ceph_mdsc_do_request(mdsc, NULL, req);
ceph_mdsc_put_request(req);
out:
doutc(cl, "%p %llx.%llx open result=%d\n", inode, ceph_vinop(inode),
err);
return err < 0 ? err : 0;
}
/*
* If we already have the requisite capabilities, we can satisfy
* the open request locally (no need to request new caps from the
* MDS). We do, however, need to inform the MDS (asynchronously)
* if our wanted caps set expands.
*/
int ceph_open(struct inode *inode, struct file *file)
{
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_fs_client *fsc = ceph_sb_to_fs_client(inode->i_sb);
struct ceph_client *cl = fsc->client;
struct ceph_mds_client *mdsc = fsc->mdsc;
struct ceph_mds_request *req;
struct ceph_file_info *fi = file->private_data;
int err;
int flags, fmode, wanted;
struct dentry *dentry;
char *path;
int pathlen;
u64 pathbase;
bool do_sync = false;
int mask = MAY_READ;
if (fi) {
doutc(cl, "file %p is already opened\n", file);
return 0;
}
/* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */
flags = file->f_flags & ~(O_CREAT|O_EXCL);
if (S_ISDIR(inode->i_mode)) {
flags = O_DIRECTORY; /* mds likes to know */
} else if (S_ISREG(inode->i_mode)) {
err = fscrypt_file_open(inode, file);
if (err)
return err;
}
doutc(cl, "%p %llx.%llx file %p flags %d (%d)\n", inode,
ceph_vinop(inode), file, flags, file->f_flags);
fmode = ceph_flags_to_mode(flags);
wanted = ceph_caps_for_mode(fmode);
if (fmode & CEPH_FILE_MODE_WR)
mask |= MAY_WRITE;
dentry = d_find_alias(inode);
if (!dentry) {
do_sync = true;
} else {
path = ceph_mdsc_build_path(mdsc, dentry, &pathlen, &pathbase, 0);
if (IS_ERR(path)) {
do_sync = true;
err = 0;
} else {
err = ceph_mds_check_access(mdsc, path, mask);
}
ceph_mdsc_free_path(path, pathlen);
dput(dentry);
/* For none EACCES cases will let the MDS do the mds auth check */
if (err == -EACCES) {
return err;
} else if (err < 0) {
do_sync = true;
err = 0;
}
}
/* snapped files are read-only */
if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE))
return -EROFS;
/* trivially open snapdir */
if (ceph_snap(inode) == CEPH_SNAPDIR) {
return ceph_init_file(inode, file, fmode);
}
/*
* No need to block if we have caps on the auth MDS (for
* write) or any MDS (for read). Update wanted set
* asynchronously.
*/
spin_lock(&ci->i_ceph_lock);
if (!do_sync && __ceph_is_any_real_caps(ci) &&
(((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) {
int mds_wanted = __ceph_caps_mds_wanted(ci, true);
int issued = __ceph_caps_issued(ci, NULL);
doutc(cl, "open %p fmode %d want %s issued %s using existing\n",
inode, fmode, ceph_cap_string(wanted),
ceph_cap_string(issued));
__ceph_touch_fmode(ci, mdsc, fmode);
spin_unlock(&ci->i_ceph_lock);
/* adjust wanted? */
if ((issued & wanted) != wanted &&
(mds_wanted & wanted) != wanted &&
ceph_snap(inode) != CEPH_SNAPDIR)
ceph_check_caps(ci, 0);
return ceph_init_file(inode, file, fmode);
} else if (!do_sync && ceph_snap(inode) != CEPH_NOSNAP &&
(ci->i_snap_caps & wanted) == wanted) {
__ceph_touch_fmode(ci, mdsc, fmode);
spin_unlock(&ci->i_ceph_lock);
return ceph_init_file(inode, file, fmode);
}
spin_unlock(&ci->i_ceph_lock);
doutc(cl, "open fmode %d wants %s\n", fmode, ceph_cap_string(wanted));
req = prepare_open_request(inode->i_sb, flags, 0);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto out;
}
req->r_inode = inode;
ihold(inode);
req->r_num_caps = 1;
err = ceph_mdsc_do_request(mdsc, NULL, req);
if (!err)
err = ceph_init_file(inode, file, req->r_fmode);
ceph_mdsc_put_request(req);
doutc(cl, "open result=%d on %llx.%llx\n", err, ceph_vinop(inode));
out:
return err;
}
/* Clone the layout from a synchronous create, if the dir now has Dc caps */
static void
cache_file_layout(struct inode *dst, struct inode *src)
{
struct ceph_inode_info *cdst = ceph_inode(dst);
struct ceph_inode_info *csrc = ceph_inode(src);
spin_lock(&cdst->i_ceph_lock);
if ((__ceph_caps_issued(cdst, NULL) & CEPH_CAP_DIR_CREATE) &&
!ceph_file_layout_is_valid(&cdst->i_cached_layout)) {
memcpy(&cdst->i_cached_layout, &csrc->i_layout,
sizeof(cdst->i_cached_layout));
rcu_assign_pointer(cdst->i_cached_layout.pool_ns,
ceph_try_get_string(csrc->i_layout.pool_ns));
}
spin_unlock(&cdst->i_ceph_lock);
}
/*
* Try to set up an async create. We need caps, a file layout, and inode number,
* and either a lease on the dentry or complete dir info. If any of those
* criteria are not satisfied, then return false and the caller can go
* synchronous.
*/
static int try_prep_async_create(struct inode *dir, struct dentry *dentry,
struct ceph_file_layout *lo, u64 *pino)
{
struct ceph_inode_info *ci = ceph_inode(dir);
struct ceph_dentry_info *di = ceph_dentry(dentry);
int got = 0, want = CEPH_CAP_FILE_EXCL | CEPH_CAP_DIR_CREATE;
u64 ino;
spin_lock(&ci->i_ceph_lock);
/* No auth cap means no chance for Dc caps */
if (!ci->i_auth_cap)
goto no_async;
/* Any delegated inos? */
if (xa_empty(&ci->i_auth_cap->session->s_delegated_inos))
goto no_async;
if (!ceph_file_layout_is_valid(&ci->i_cached_layout))
goto no_async;
if ((__ceph_caps_issued(ci, NULL) & want) != want)
goto no_async;
if (d_in_lookup(dentry)) {
if (!__ceph_dir_is_complete(ci))
goto no_async;
spin_lock(&dentry->d_lock);
di->lease_shared_gen = atomic_read(&ci->i_shared_gen);
spin_unlock(&dentry->d_lock);
} else if (atomic_read(&ci->i_shared_gen) !=
READ_ONCE(di->lease_shared_gen)) {
goto no_async;
}
ino = ceph_get_deleg_ino(ci->i_auth_cap->session);
if (!ino)
goto no_async;
*pino = ino;
ceph_take_cap_refs(ci, want, false);
memcpy(lo, &ci->i_cached_layout, sizeof(*lo));
rcu_assign_pointer(lo->pool_ns,
ceph_try_get_string(ci->i_cached_layout.pool_ns));
got = want;
no_async:
spin_unlock(&ci->i_ceph_lock);
return got;
}
static void restore_deleg_ino(struct inode *dir, u64 ino)
{
struct ceph_client *cl = ceph_inode_to_client(dir);
struct ceph_inode_info *ci = ceph_inode(dir);
struct ceph_mds_session *s = NULL;
spin_lock(&ci->i_ceph_lock);
if (ci->i_auth_cap)
s = ceph_get_mds_session(ci->i_auth_cap->session);
spin_unlock(&ci->i_ceph_lock);
if (s) {
int err = ceph_restore_deleg_ino(s, ino);
if (err)
pr_warn_client(cl,
"unable to restore delegated ino 0x%llx to session: %d\n",
ino, err);
ceph_put_mds_session(s);
}
}
static void wake_async_create_waiters(struct inode *inode,
struct ceph_mds_session *session)
{
struct ceph_inode_info *ci = ceph_inode(inode);
bool check_cap = false;
spin_lock(&ci->i_ceph_lock);
if (ci->i_ceph_flags & CEPH_I_ASYNC_CREATE) {
ci->i_ceph_flags &= ~CEPH_I_ASYNC_CREATE;
wake_up_bit(&ci->i_ceph_flags, CEPH_ASYNC_CREATE_BIT);
if (ci->i_ceph_flags & CEPH_I_ASYNC_CHECK_CAPS) {
ci->i_ceph_flags &= ~CEPH_I_ASYNC_CHECK_CAPS;
check_cap = true;
}
}
ceph_kick_flushing_inode_caps(session, ci);
spin_unlock(&ci->i_ceph_lock);
if (check_cap)
ceph_check_caps(ci, CHECK_CAPS_FLUSH);
}
static void ceph_async_create_cb(struct ceph_mds_client *mdsc,
struct ceph_mds_request *req)
{
struct ceph_client *cl = mdsc->fsc->client;
struct dentry *dentry = req->r_dentry;
struct inode *dinode = d_inode(dentry);
struct inode *tinode = req->r_target_inode;
int result = req->r_err ? req->r_err :
le32_to_cpu(req->r_reply_info.head->result);
WARN_ON_ONCE(dinode && tinode && dinode != tinode);
/* MDS changed -- caller must resubmit */
if (result == -EJUKEBOX)
goto out;
mapping_set_error(req->r_parent->i_mapping, result);
if (result) {
int pathlen = 0;
u64 base = 0;
char *path = ceph_mdsc_build_path(mdsc, req->r_dentry, &pathlen,
&base, 0);
pr_warn_client(cl,
"async create failure path=(%llx)%s result=%d!\n",
base, IS_ERR(path) ? "<<bad>>" : path, result);
ceph_mdsc_free_path(path, pathlen);
ceph_dir_clear_complete(req->r_parent);
if (!d_unhashed(dentry))
d_drop(dentry);
if (dinode) {
mapping_set_error(dinode->i_mapping, result);
ceph_inode_shutdown(dinode);
wake_async_create_waiters(dinode, req->r_session);
}
}
if (tinode) {
u64 ino = ceph_vino(tinode).ino;
if (req->r_deleg_ino != ino)
pr_warn_client(cl,
"inode number mismatch! err=%d deleg_ino=0x%llx target=0x%llx\n",
req->r_err, req->r_deleg_ino, ino);
mapping_set_error(tinode->i_mapping, result);
wake_async_create_waiters(tinode, req->r_session);
} else if (!result) {
pr_warn_client(cl, "no req->r_target_inode for 0x%llx\n",
req->r_deleg_ino);
}
out:
ceph_mdsc_release_dir_caps(req);
}
static int ceph_finish_async_create(struct inode *dir, struct inode *inode,
struct dentry *dentry,
struct file *file, umode_t mode,
struct ceph_mds_request *req,
struct ceph_acl_sec_ctx *as_ctx,
struct ceph_file_layout *lo)
{
int ret;
char xattr_buf[4];
struct ceph_mds_reply_inode in = { };
struct ceph_mds_reply_info_in iinfo = { .in = &in };
struct ceph_inode_info *ci = ceph_inode(dir);
struct ceph_dentry_info *di = ceph_dentry(dentry);
struct timespec64 now;
struct ceph_string *pool_ns;
struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
struct ceph_client *cl = mdsc->fsc->client;
struct ceph_vino vino = { .ino = req->r_deleg_ino,
.snap = CEPH_NOSNAP };
ktime_get_real_ts64(&now);
iinfo.inline_version = CEPH_INLINE_NONE;
iinfo.change_attr = 1;
ceph_encode_timespec64(&iinfo.btime, &now);
if (req->r_pagelist) {
iinfo.xattr_len = req->r_pagelist->length;
iinfo.xattr_data = req->r_pagelist->mapped_tail;
} else {
/* fake it */
iinfo.xattr_len = ARRAY_SIZE(xattr_buf);
iinfo.xattr_data = xattr_buf;
memset(iinfo.xattr_data, 0, iinfo.xattr_len);
}
in.ino = cpu_to_le64(vino.ino);
in.snapid = cpu_to_le64(CEPH_NOSNAP);
in.version = cpu_to_le64(1); // ???
in.cap.caps = in.cap.wanted = cpu_to_le32(CEPH_CAP_ALL_FILE);
in.cap.cap_id = cpu_to_le64(1);
in.cap.realm = cpu_to_le64(ci->i_snap_realm->ino);
in.cap.flags = CEPH_CAP_FLAG_AUTH;
in.ctime = in.mtime = in.atime = iinfo.btime;
in.truncate_seq = cpu_to_le32(1);
in.truncate_size = cpu_to_le64(-1ULL);
in.xattr_version = cpu_to_le64(1);
in.uid = cpu_to_le32(from_kuid(&init_user_ns,
mapped_fsuid(req->r_mnt_idmap,
&init_user_ns)));
if (dir->i_mode & S_ISGID) {
in.gid = cpu_to_le32(from_kgid(&init_user_ns, dir->i_gid));
/* Directories always inherit the setgid bit. */
if (S_ISDIR(mode))
mode |= S_ISGID;
} else {
in.gid = cpu_to_le32(from_kgid(&init_user_ns,
mapped_fsgid(req->r_mnt_idmap,
&init_user_ns)));
}
in.mode = cpu_to_le32((u32)mode);
in.nlink = cpu_to_le32(1);
in.max_size = cpu_to_le64(lo->stripe_unit);
ceph_file_layout_to_legacy(lo, &in.layout);
/* lo is private, so pool_ns can't change */
pool_ns = rcu_dereference_raw(lo->pool_ns);
if (pool_ns) {
iinfo.pool_ns_len = pool_ns->len;
iinfo.pool_ns_data = pool_ns->str;
}
down_read(&mdsc->snap_rwsem);
ret = ceph_fill_inode(inode, NULL, &iinfo, NULL, req->r_session,
req->r_fmode, NULL);
up_read(&mdsc->snap_rwsem);
if (ret) {
doutc(cl, "failed to fill inode: %d\n", ret);
ceph_dir_clear_complete(dir);
if (!d_unhashed(dentry))
d_drop(dentry);
discard_new_inode(inode);
} else {
struct dentry *dn;
doutc(cl, "d_adding new inode 0x%llx to 0x%llx/%s\n",
vino.ino, ceph_ino(dir), dentry->d_name.name);
ceph_dir_clear_ordered(dir);
ceph_init_inode_acls(inode, as_ctx);
if (inode->i_state & I_NEW) {
/*
* If it's not I_NEW, then someone created this before
* we got here. Assume the server is aware of it at
* that point and don't worry about setting
* CEPH_I_ASYNC_CREATE.
*/
ceph_inode(inode)->i_ceph_flags = CEPH_I_ASYNC_CREATE;
unlock_new_inode(inode);
}
if (d_in_lookup(dentry) || d_really_is_negative(dentry)) {
if (!d_unhashed(dentry))
d_drop(dentry);
dn = d_splice_alias(inode, dentry);
WARN_ON_ONCE(dn && dn != dentry);
}
file->f_mode |= FMODE_CREATED;
ret = finish_open(file, dentry, ceph_open);
}
spin_lock(&dentry->d_lock);
di->flags &= ~CEPH_DENTRY_ASYNC_CREATE;
wake_up_bit(&di->flags, CEPH_DENTRY_ASYNC_CREATE_BIT);
spin_unlock(&dentry->d_lock);
return ret;
}
/*
* Do a lookup + open with a single request. If we get a non-existent
* file or symlink, return 1 so the VFS can retry.
*/
int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
struct file *file, unsigned flags, umode_t mode)
{
struct mnt_idmap *idmap = file_mnt_idmap(file);
struct ceph_fs_client *fsc = ceph_sb_to_fs_client(dir->i_sb);
struct ceph_client *cl = fsc->client;
struct ceph_mds_client *mdsc = fsc->mdsc;
struct ceph_mds_request *req;
struct inode *new_inode = NULL;
struct dentry *dn;
struct ceph_acl_sec_ctx as_ctx = {};
bool try_async = ceph_test_mount_opt(fsc, ASYNC_DIROPS);
int mask;
int err;
char *path;
int pathlen;
u64 pathbase;
doutc(cl, "%p %llx.%llx dentry %p '%pd' %s flags %d mode 0%o\n",
dir, ceph_vinop(dir), dentry, dentry,
d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode);
if (dentry->d_name.len > NAME_MAX)
return -ENAMETOOLONG;
err = ceph_wait_on_conflict_unlink(dentry);
if (err)
return err;
/*
* Do not truncate the file, since atomic_open is called before the
* permission check. The caller will do the truncation afterward.
*/
flags &= ~O_TRUNC;
dn = d_find_alias(dir);
if (!dn) {
try_async = false;
} else {
path = ceph_mdsc_build_path(mdsc, dn, &pathlen, &pathbase, 0);
if (IS_ERR(path)) {
try_async = false;
err = 0;
} else {
int fmode = ceph_flags_to_mode(flags);
mask = MAY_READ;
if (fmode & CEPH_FILE_MODE_WR)
mask |= MAY_WRITE;
err = ceph_mds_check_access(mdsc, path, mask);
}
ceph_mdsc_free_path(path, pathlen);
dput(dn);
/* For none EACCES cases will let the MDS do the mds auth check */
if (err == -EACCES) {
return err;
} else if (err < 0) {
try_async = false;
err = 0;
}
}
retry:
if (flags & O_CREAT) {
if (ceph_quota_is_max_files_exceeded(dir))
return -EDQUOT;
new_inode = ceph_new_inode(dir, dentry, &mode, &as_ctx);
if (IS_ERR(new_inode)) {
err = PTR_ERR(new_inode);
goto out_ctx;
}
/* Async create can't handle more than a page of xattrs */
if (as_ctx.pagelist &&
!list_is_singular(&as_ctx.pagelist->head))
try_async = false;
} else if (!d_in_lookup(dentry)) {
/* If it's not being looked up, it's negative */
return -ENOENT;
}
/* do the open */
req = prepare_open_request(dir->i_sb, flags, mode);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto out_ctx;
}
req->r_dentry = dget(dentry);
req->r_num_caps = 2;
mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
if (ceph_security_xattr_wanted(dir))
mask |= CEPH_CAP_XATTR_SHARED;
req->r_args.open.mask = cpu_to_le32(mask);
req->r_parent = dir;
if (req->r_op == CEPH_MDS_OP_CREATE)
req->r_mnt_idmap = mnt_idmap_get(idmap);
ihold(dir);
if (IS_ENCRYPTED(dir)) {
set_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags);
err = fscrypt_prepare_lookup_partial(dir, dentry);
if (err < 0)
goto out_req;
}
if (flags & O_CREAT) {
struct ceph_file_layout lo;
req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL |
CEPH_CAP_XATTR_EXCL;
req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
ceph_as_ctx_to_req(req, &as_ctx);
if (try_async && (req->r_dir_caps =
try_prep_async_create(dir, dentry, &lo,
&req->r_deleg_ino))) {
struct ceph_vino vino = { .ino = req->r_deleg_ino,
.snap = CEPH_NOSNAP };
struct ceph_dentry_info *di = ceph_dentry(dentry);
set_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags);
req->r_args.open.flags |= cpu_to_le32(CEPH_O_EXCL);
req->r_callback = ceph_async_create_cb;
/* Hash inode before RPC */
new_inode = ceph_get_inode(dir->i_sb, vino, new_inode);
if (IS_ERR(new_inode)) {
err = PTR_ERR(new_inode);
new_inode = NULL;
goto out_req;
}
WARN_ON_ONCE(!(new_inode->i_state & I_NEW));
spin_lock(&dentry->d_lock);
di->flags |= CEPH_DENTRY_ASYNC_CREATE;
spin_unlock(&dentry->d_lock);
err = ceph_mdsc_submit_request(mdsc, dir, req);
if (!err) {
err = ceph_finish_async_create(dir, new_inode,
dentry, file,
mode, req,
&as_ctx, &lo);
new_inode = NULL;
} else if (err == -EJUKEBOX) {
restore_deleg_ino(dir, req->r_deleg_ino);
ceph_mdsc_put_request(req);
discard_new_inode(new_inode);
ceph_release_acl_sec_ctx(&as_ctx);
memset(&as_ctx, 0, sizeof(as_ctx));
new_inode = NULL;
try_async = false;
ceph_put_string(rcu_dereference_raw(lo.pool_ns));
goto retry;
}
ceph_put_string(rcu_dereference_raw(lo.pool_ns));
goto out_req;
}
}
set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
req->r_new_inode = new_inode;
new_inode = NULL;
err = ceph_mdsc_do_request(mdsc, (flags & O_CREAT) ? dir : NULL, req);
if (err == -ENOENT) {
dentry = ceph_handle_snapdir(req, dentry);
if (IS_ERR(dentry)) {
err = PTR_ERR(dentry);
goto out_req;
}
err = 0;
}
if (!err && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
err = ceph_handle_notrace_create(dir, dentry);
if (d_in_lookup(dentry)) {
dn = ceph_finish_lookup(req, dentry, err);
if (IS_ERR(dn))
err = PTR_ERR(dn);
} else {
/* we were given a hashed negative dentry */
dn = NULL;
}
if (err)
goto out_req;
if (dn || d_really_is_negative(dentry) || d_is_symlink(dentry)) {
/* make vfs retry on splice, ENOENT, or symlink */
doutc(cl, "finish_no_open on dn %p\n", dn);
err = finish_no_open(file, dn);
} else {
if (IS_ENCRYPTED(dir) &&
!fscrypt_has_permitted_context(dir, d_inode(dentry))) {
pr_warn_client(cl,
"Inconsistent encryption context (parent %llx:%llx child %llx:%llx)\n",
ceph_vinop(dir), ceph_vinop(d_inode(dentry)));
goto out_req;
}
doutc(cl, "finish_open on dn %p\n", dn);
if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
struct inode *newino = d_inode(dentry);
cache_file_layout(dir, newino);
ceph_init_inode_acls(newino, &as_ctx);
file->f_mode |= FMODE_CREATED;
}
err = finish_open(file, dentry, ceph_open);
}
out_req:
ceph_mdsc_put_request(req);
iput(new_inode);
out_ctx:
ceph_release_acl_sec_ctx(&as_ctx);
doutc(cl, "result=%d\n", err);
return err;
}
int ceph_release(struct inode *inode, struct file *file)
{
struct ceph_client *cl = ceph_inode_to_client(inode);
struct ceph_inode_info *ci = ceph_inode(inode);
if (S_ISDIR(inode->i_mode)) {
struct ceph_dir_file_info *dfi = file->private_data;
doutc(cl, "%p %llx.%llx dir file %p\n", inode,
ceph_vinop(inode), file);
WARN_ON(!list_empty(&dfi->file_info.rw_contexts));
ceph_put_fmode(ci, dfi->file_info.fmode, 1);
if (dfi->last_readdir)
ceph_mdsc_put_request(dfi->last_readdir);
kfree(dfi->last_name);
kfree(dfi->dir_info);
kmem_cache_free(ceph_dir_file_cachep, dfi);
} else {
struct ceph_file_info *fi = file->private_data;
doutc(cl, "%p %llx.%llx regular file %p\n", inode,
ceph_vinop(inode), file);
WARN_ON(!list_empty(&fi->rw_contexts));
ceph_fscache_unuse_cookie(inode, file->f_mode & FMODE_WRITE);
ceph_put_fmode(ci, fi->fmode, 1);
kmem_cache_free(ceph_file_cachep, fi);
}
/* wake up anyone waiting for caps on this inode */
wake_up_all(&ci->i_cap_wq);
return 0;
}
enum {
HAVE_RETRIED = 1,
CHECK_EOF = 2,
READ_INLINE = 3,
};
/*
* Completely synchronous read and write methods. Direct from __user
* buffer to osd, or directly to user pages (if O_DIRECT).
*
* If the read spans object boundary, just do multiple reads. (That's not
* atomic, but good enough for now.)
*
* If we get a short result from the OSD, check against i_size; we need to
* only return a short read to the caller if we hit EOF.
*/
ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos,
struct iov_iter *to, int *retry_op,
u64 *last_objver)
{
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
struct ceph_client *cl = fsc->client;
struct ceph_osd_client *osdc = &fsc->client->osdc;
ssize_t ret;
u64 off = *ki_pos;
u64 len = iov_iter_count(to);
u64 i_size = i_size_read(inode);
bool sparse = IS_ENCRYPTED(inode) || ceph_test_mount_opt(fsc, SPARSEREAD);
u64 objver = 0;
doutc(cl, "on inode %p %llx.%llx %llx~%llx\n", inode,
ceph_vinop(inode), *ki_pos, len);
if (ceph_inode_is_shutdown(inode))
return -EIO;
if (!len)
return 0;
/*
* flush any page cache pages in this range. this
* will make concurrent normal and sync io slow,
* but it will at least behave sensibly when they are
* in sequence.
*/
ret = filemap_write_and_wait_range(inode->i_mapping,
off, off + len - 1);
if (ret < 0)
return ret;
ret = 0;
while ((len = iov_iter_count(to)) > 0) {
struct ceph_osd_request *req;
struct page **pages;
int num_pages;
size_t page_off;
bool more;
int idx;
size_t left;
struct ceph_osd_req_op *op;
u64 read_off = off;
u64 read_len = len;
int extent_cnt;
/* determine new offset/length if encrypted */
ceph_fscrypt_adjust_off_and_len(inode, &read_off, &read_len);
doutc(cl, "orig %llu~%llu reading %llu~%llu", off, len,
read_off, read_len);
req = ceph_osdc_new_request(osdc, &ci->i_layout,
ci->i_vino, read_off, &read_len, 0, 1,
sparse ? CEPH_OSD_OP_SPARSE_READ :
CEPH_OSD_OP_READ,
CEPH_OSD_FLAG_READ,
NULL, ci->i_truncate_seq,
ci->i_truncate_size, false);
if (IS_ERR(req)) {
ret = PTR_ERR(req);
break;
}
/* adjust len downward if the request truncated the len */
if (off + len > read_off + read_len)
len = read_off + read_len - off;
more = len < iov_iter_count(to);
num_pages = calc_pages_for(read_off, read_len);
page_off = offset_in_page(off);
pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
if (IS_ERR(pages)) {
ceph_osdc_put_request(req);
ret = PTR_ERR(pages);
break;
}
osd_req_op_extent_osd_data_pages(req, 0, pages, read_len,
offset_in_page(read_off),
false, false);
op = &req->r_ops[0];
if (sparse) {
extent_cnt = __ceph_sparse_read_ext_count(inode, read_len);
ret = ceph_alloc_sparse_ext_map(op, extent_cnt);
if (ret) {
ceph_osdc_put_request(req);
break;
}
}
ceph_osdc_start_request(osdc, req);
ret = ceph_osdc_wait_request(osdc, req);
ceph_update_read_metrics(&fsc->mdsc->metric,
req->r_start_latency,
req->r_end_latency,
read_len, ret);
if (ret > 0)
objver = req->r_version;
i_size = i_size_read(inode);
doutc(cl, "%llu~%llu got %zd i_size %llu%s\n", off, len,
ret, i_size, (more ? " MORE" : ""));
/* Fix it to go to end of extent map */
if (sparse && ret >= 0)
ret = ceph_sparse_ext_map_end(op);
else if (ret == -ENOENT)
ret = 0;
if (ret > 0 && IS_ENCRYPTED(inode)) {
int fret;
fret = ceph_fscrypt_decrypt_extents(inode, pages,
read_off, op->extent.sparse_ext,
op->extent.sparse_ext_cnt);
if (fret < 0) {
ret = fret;
ceph_osdc_put_request(req);
break;
}
/* account for any partial block at the beginning */
fret -= (off - read_off);
/*
* Short read after big offset adjustment?
* Nothing is usable, just call it a zero
* len read.
*/
fret = max(fret, 0);
/* account for partial block at the end */
ret = min_t(ssize_t, fret, len);
}
ceph_osdc_put_request(req);
/* Short read but not EOF? Zero out the remainder. */
if (ret >= 0 && ret < len && (off + ret < i_size)) {
int zlen = min(len - ret, i_size - off - ret);
int zoff = page_off + ret;
doutc(cl, "zero gap %llu~%llu\n", off + ret,
off + ret + zlen);
ceph_zero_page_vector_range(zoff, zlen, pages);
ret += zlen;
}
idx = 0;
if (ret <= 0)
left = 0;
else if (off + ret > i_size)
left = i_size - off;
else
left = ret;
while (left > 0) {
size_t plen, copied;
plen = min_t(size_t, left, PAGE_SIZE - page_off);
SetPageUptodate(pages[idx]);
copied = copy_page_to_iter(pages[idx++],
page_off, plen, to);
off += copied;
left -= copied;
page_off = 0;
if (copied < plen) {
ret = -EFAULT;
break;
}
}
ceph_release_page_vector(pages, num_pages);
if (ret < 0) {
if (ret == -EBLOCKLISTED)
fsc->blocklisted = true;
break;
}
if (off >= i_size || !more)
break;
}
if (ret > 0) {
if (off >= i_size) {
*retry_op = CHECK_EOF;
ret = i_size - *ki_pos;
*ki_pos = i_size;
} else {
ret = off - *ki_pos;
*ki_pos = off;
}
if (last_objver)
*last_objver = objver;
}
doutc(cl, "result %zd retry_op %d\n", ret, *retry_op);
return ret;
}
static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to,
int *retry_op)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file_inode(file);
struct ceph_client *cl = ceph_inode_to_client(inode);
doutc(cl, "on file %p %llx~%zx %s\n", file, iocb->ki_pos,
iov_iter_count(to),
(file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
return __ceph_sync_read(inode, &iocb->ki_pos, to, retry_op, NULL);
}
struct ceph_aio_request {
struct kiocb *iocb;
size_t total_len;
bool write;
bool should_dirty;
int error;
struct list_head osd_reqs;
unsigned num_reqs;
atomic_t pending_reqs;
struct timespec64 mtime;
struct ceph_cap_flush *prealloc_cf;
};
struct ceph_aio_work {
struct work_struct work;
struct ceph_osd_request *req;
};
static void ceph_aio_retry_work(struct work_struct *work);
static void ceph_aio_complete(struct inode *inode,
struct ceph_aio_request *aio_req)
{
struct ceph_client *cl = ceph_inode_to_client(inode);
struct ceph_inode_info *ci = ceph_inode(inode);
int ret;
if (!atomic_dec_and_test(&aio_req->pending_reqs))
return;
if (aio_req->iocb->ki_flags & IOCB_DIRECT)
inode_dio_end(inode);
ret = aio_req->error;
if (!ret)
ret = aio_req->total_len;
doutc(cl, "%p %llx.%llx rc %d\n", inode, ceph_vinop(inode), ret);
if (ret >= 0 && aio_req->write) {
int dirty;
loff_t endoff = aio_req->iocb->ki_pos + aio_req->total_len;
if (endoff > i_size_read(inode)) {
if (ceph_inode_set_size(inode, endoff))
ceph_check_caps(ci, CHECK_CAPS_AUTHONLY);
}
spin_lock(&ci->i_ceph_lock);
dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
&aio_req->prealloc_cf);
spin_unlock(&ci->i_ceph_lock);
if (dirty)
__mark_inode_dirty(inode, dirty);
}
ceph_put_cap_refs(ci, (aio_req->write ? CEPH_CAP_FILE_WR :
CEPH_CAP_FILE_RD));
aio_req->iocb->ki_complete(aio_req->iocb, ret);
ceph_free_cap_flush(aio_req->prealloc_cf);
kfree(aio_req);
}
static void ceph_aio_complete_req(struct ceph_osd_request *req)
{
int rc = req->r_result;
struct inode *inode = req->r_inode;
struct ceph_aio_request *aio_req = req->r_priv;
struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
struct ceph_osd_req_op *op = &req->r_ops[0];
struct ceph_client_metric *metric = &ceph_sb_to_mdsc(inode->i_sb)->metric;
unsigned int len = osd_data->bvec_pos.iter.bi_size;
bool sparse = (op->op == CEPH_OSD_OP_SPARSE_READ);
struct ceph_client *cl = ceph_inode_to_client(inode);
BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_BVECS);
BUG_ON(!osd_data->num_bvecs);
doutc(cl, "req %p inode %p %llx.%llx, rc %d bytes %u\n", req,
inode, ceph_vinop(inode), rc, len);
if (rc == -EOLDSNAPC) {
struct ceph_aio_work *aio_work;
BUG_ON(!aio_req->write);
aio_work = kmalloc(sizeof(*aio_work), GFP_NOFS);
if (aio_work) {
INIT_WORK(&aio_work->work, ceph_aio_retry_work);
aio_work->req = req;
queue_work(ceph_inode_to_fs_client(inode)->inode_wq,
&aio_work->work);
return;
}
rc = -ENOMEM;
} else if (!aio_req->write) {
if (sparse && rc >= 0)
rc = ceph_sparse_ext_map_end(op);
if (rc == -ENOENT)
rc = 0;
if (rc >= 0 && len > rc) {
struct iov_iter i;
int zlen = len - rc;
/*
* If read is satisfied by single OSD request,
* it can pass EOF. Otherwise read is within
* i_size.
*/
if (aio_req->num_reqs == 1) {
loff_t i_size = i_size_read(inode);
loff_t endoff = aio_req->iocb->ki_pos + rc;
if (endoff < i_size)
zlen = min_t(size_t, zlen,
i_size - endoff);
aio_req->total_len = rc + zlen;
}
iov_iter_bvec(&i, ITER_DEST, osd_data->bvec_pos.bvecs,
osd_data->num_bvecs, len);
iov_iter_advance(&i, rc);
iov_iter_zero(zlen, &i);
}
}
/* r_start_latency == 0 means the request was not submitted */
if (req->r_start_latency) {
if (aio_req->write)
ceph_update_write_metrics(metric, req->r_start_latency,
req->r_end_latency, len, rc);
else
ceph_update_read_metrics(metric, req->r_start_latency,
req->r_end_latency, len, rc);
}
put_bvecs(osd_data->bvec_pos.bvecs, osd_data->num_bvecs,
aio_req->should_dirty);
ceph_osdc_put_request(req);
if (rc < 0)
cmpxchg(&aio_req->error, 0, rc);
ceph_aio_complete(inode, aio_req);
return;
}
static void ceph_aio_retry_work(struct work_struct *work)
{
struct ceph_aio_work *aio_work =
container_of(work, struct ceph_aio_work, work);
struct ceph_osd_request *orig_req = aio_work->req;
struct ceph_aio_request *aio_req = orig_req->r_priv;
struct inode *inode = orig_req->r_inode;
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_snap_context *snapc;
struct ceph_osd_request *req;
int ret;
spin_lock(&ci->i_ceph_lock);
if (__ceph_have_pending_cap_snap(ci)) {
struct ceph_cap_snap *capsnap =
list_last_entry(&ci->i_cap_snaps,
struct ceph_cap_snap,
ci_item);
snapc = ceph_get_snap_context(capsnap->context);
} else {
BUG_ON(!ci->i_head_snapc);
snapc = ceph_get_snap_context(ci->i_head_snapc);
}
spin_unlock(&ci->i_ceph_lock);
req = ceph_osdc_alloc_request(orig_req->r_osdc, snapc, 1,
false, GFP_NOFS);
if (!req) {
ret = -ENOMEM;
req = orig_req;
goto out;
}
req->r_flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
ceph_oloc_copy(&req->r_base_oloc, &orig_req->r_base_oloc);
ceph_oid_copy(&req->r_base_oid, &orig_req->r_base_oid);
req->r_ops[0] = orig_req->r_ops[0];
req->r_mtime = aio_req->mtime;
req->r_data_offset = req->r_ops[0].extent.offset;
ret = ceph_osdc_alloc_messages(req, GFP_NOFS);
if (ret) {
ceph_osdc_put_request(req);
req = orig_req;
goto out;
}
ceph_osdc_put_request(orig_req);
req->r_callback = ceph_aio_complete_req;
req->r_inode = inode;
req->r_priv = aio_req;
ceph_osdc_start_request(req->r_osdc, req);
out:
if (ret < 0) {
req->r_result = ret;
ceph_aio_complete_req(req);
}
ceph_put_snap_context(snapc);
kfree(aio_work);
}
static ssize_t
ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
struct ceph_snap_context *snapc,
struct ceph_cap_flush **pcf)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file_inode(file);
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
struct ceph_client *cl = fsc->client;
struct ceph_client_metric *metric = &fsc->mdsc->metric;
struct ceph_vino vino;
struct ceph_osd_request *req;
struct bio_vec *bvecs;
struct ceph_aio_request *aio_req = NULL;
int num_pages = 0;
int flags;
int ret = 0;
struct timespec64 mtime = current_time(inode);
size_t count = iov_iter_count(iter);
loff_t pos = iocb->ki_pos;
bool write = iov_iter_rw(iter) == WRITE;
bool should_dirty = !write && user_backed_iter(iter);
bool sparse = ceph_test_mount_opt(fsc, SPARSEREAD);
if (write && ceph_snap(file_inode(file)) != CEPH_NOSNAP)
return -EROFS;
doutc(cl, "sync_direct_%s on file %p %lld~%u snapc %p seq %lld\n",
(write ? "write" : "read"), file, pos, (unsigned)count,
snapc, snapc ? snapc->seq : 0);
if (write) {
int ret2;
ceph_fscache_invalidate(inode, true);
ret2 = invalidate_inode_pages2_range(inode->i_mapping,
pos >> PAGE_SHIFT,
(pos + count - 1) >> PAGE_SHIFT);
if (ret2 < 0)
doutc(cl, "invalidate_inode_pages2_range returned %d\n",
ret2);
flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
} else {
flags = CEPH_OSD_FLAG_READ;
}
while (iov_iter_count(iter) > 0) {
u64 size = iov_iter_count(iter);
ssize_t len;
struct ceph_osd_req_op *op;
int readop = sparse ? CEPH_OSD_OP_SPARSE_READ : CEPH_OSD_OP_READ;
int extent_cnt;
if (write)
size = min_t(u64, size, fsc->mount_options->wsize);
else
size = min_t(u64, size, fsc->mount_options->rsize);
vino = ceph_vino(inode);
req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
vino, pos, &size, 0,
1,
write ? CEPH_OSD_OP_WRITE : readop,
flags, snapc,
ci->i_truncate_seq,
ci->i_truncate_size,
false);
if (IS_ERR(req)) {
ret = PTR_ERR(req);
break;
}
len = iter_get_bvecs_alloc(iter, size, &bvecs, &num_pages);
if (len < 0) {
ceph_osdc_put_request(req);
ret = len;
break;
}
if (len != size)
osd_req_op_extent_update(req, 0, len);
/*
* To simplify error handling, allow AIO when IO within i_size
* or IO can be satisfied by single OSD request.
*/
if (pos == iocb->ki_pos && !is_sync_kiocb(iocb) &&
(len == count || pos + count <= i_size_read(inode))) {
aio_req = kzalloc(sizeof(*aio_req), GFP_KERNEL);
if (aio_req) {
aio_req->iocb = iocb;
aio_req->write = write;
aio_req->should_dirty = should_dirty;
INIT_LIST_HEAD(&aio_req->osd_reqs);
if (write) {
aio_req->mtime = mtime;
swap(aio_req->prealloc_cf, *pcf);
}
}
/* ignore error */
}
if (write) {
/*
* throw out any page cache pages in this range. this
* may block.
*/
truncate_inode_pages_range(inode->i_mapping, pos,
PAGE_ALIGN(pos + len) - 1);
req->r_mtime = mtime;
}
osd_req_op_extent_osd_data_bvecs(req, 0, bvecs, num_pages, len);
op = &req->r_ops[0];
if (sparse) {
extent_cnt = __ceph_sparse_read_ext_count(inode, size);
ret = ceph_alloc_sparse_ext_map(op, extent_cnt);
if (ret) {
ceph_osdc_put_request(req);
break;
}
}
if (aio_req) {
aio_req->total_len += len;
aio_req->num_reqs++;
atomic_inc(&aio_req->pending_reqs);
req->r_callback = ceph_aio_complete_req;
req->r_inode = inode;
req->r_priv = aio_req;
list_add_tail(&req->r_private_item, &aio_req->osd_reqs);
pos += len;
continue;
}
ceph_osdc_start_request(req->r_osdc, req);
ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
if (write)
ceph_update_write_metrics(metric, req->r_start_latency,
req->r_end_latency, len, ret);
else
ceph_update_read_metrics(metric, req->r_start_latency,
req->r_end_latency, len, ret);
size = i_size_read(inode);
if (!write) {
if (sparse && ret >= 0)
ret = ceph_sparse_ext_map_end(op);
else if (ret == -ENOENT)
ret = 0;
if (ret >= 0 && ret < len && pos + ret < size) {
struct iov_iter i;
int zlen = min_t(size_t, len - ret,
size - pos - ret);
iov_iter_bvec(&i, ITER_DEST, bvecs, num_pages, len);
iov_iter_advance(&i, ret);
iov_iter_zero(zlen, &i);
ret += zlen;
}
if (ret >= 0)
len = ret;
}
put_bvecs(bvecs, num_pages, should_dirty);
ceph_osdc_put_request(req);
if (ret < 0)
break;
pos += len;
if (!write && pos >= size)
break;
if (write && pos > size) {
if (ceph_inode_set_size(inode, pos))
ceph_check_caps(ceph_inode(inode),
CHECK_CAPS_AUTHONLY);
}
}
if (aio_req) {
LIST_HEAD(osd_reqs);
if (aio_req->num_reqs == 0) {
kfree(aio_req);
return ret;
}
ceph_get_cap_refs(ci, write ? CEPH_CAP_FILE_WR :
CEPH_CAP_FILE_RD);
list_splice(&aio_req->osd_reqs, &osd_reqs);
inode_dio_begin(inode);
while (!list_empty(&osd_reqs)) {
req = list_first_entry(&osd_reqs,
struct ceph_osd_request,
r_private_item);
list_del_init(&req->r_private_item);
if (ret >= 0)
ceph_osdc_start_request(req->r_osdc, req);
if (ret < 0) {
req->r_result = ret;
ceph_aio_complete_req(req);
}
}
return -EIOCBQUEUED;
}
if (ret != -EOLDSNAPC && pos > iocb->ki_pos) {
ret = pos - iocb->ki_pos;
iocb->ki_pos = pos;
}
return ret;
}
/*
* Synchronous write, straight from __user pointer or user pages.
*
* If write spans object boundary, just do multiple writes. (For a
* correct atomic write, we should e.g. take write locks on all
* objects, rollback on failure, etc.)
*/
static ssize_t
ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
struct ceph_snap_context *snapc)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file_inode(file);
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
struct ceph_client *cl = fsc->client;
struct ceph_osd_client *osdc = &fsc->client->osdc;
struct ceph_osd_request *req;
struct page **pages;
u64 len;
int num_pages;
int written = 0;
int ret;
bool check_caps = false;
struct timespec64 mtime = current_time(inode);
size_t count = iov_iter_count(from);
if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
return -EROFS;
doutc(cl, "on file %p %lld~%u snapc %p seq %lld\n", file, pos,
(unsigned)count, snapc, snapc->seq);
ret = filemap_write_and_wait_range(inode->i_mapping,
pos, pos + count - 1);
if (ret < 0)
return ret;
ceph_fscache_invalidate(inode, false);
while ((len = iov_iter_count(from)) > 0) {
size_t left;
int n;
u64 write_pos = pos;
u64 write_len = len;
u64 objnum, objoff;
u32 xlen;
u64 assert_ver = 0;
bool rmw;
bool first, last;
struct iov_iter saved_iter = *from;
size_t off;
ceph_fscrypt_adjust_off_and_len(inode, &write_pos, &write_len);
/* clamp the length to the end of first object */
ceph_calc_file_object_mapping(&ci->i_layout, write_pos,
write_len, &objnum, &objoff,
&xlen);
write_len = xlen;
/* adjust len downward if it goes beyond current object */
if (pos + len > write_pos + write_len)
len = write_pos + write_len - pos;
/*
* If we had to adjust the length or position to align with a
* crypto block, then we must do a read/modify/write cycle. We
* use a version assertion to redrive the thing if something
* changes in between.
*/
first = pos != write_pos;
last = (pos + len) != (write_pos + write_len);
rmw = first || last;
doutc(cl, "ino %llx %lld~%llu adjusted %lld~%llu -- %srmw\n",
ci->i_vino.ino, pos, len, write_pos, write_len,
rmw ? "" : "no ");
/*
* The data is emplaced into the page as it would be if it were
* in an array of pagecache pages.
*/
num_pages = calc_pages_for(write_pos, write_len);
pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
if (IS_ERR(pages)) {
ret = PTR_ERR(pages);
break;
}
/* Do we need to preload the pages? */
if (rmw) {
u64 first_pos = write_pos;
u64 last_pos = (write_pos + write_len) - CEPH_FSCRYPT_BLOCK_SIZE;
u64 read_len = CEPH_FSCRYPT_BLOCK_SIZE;
struct ceph_osd_req_op *op;
/* We should only need to do this for encrypted inodes */
WARN_ON_ONCE(!IS_ENCRYPTED(inode));
/* No need to do two reads if first and last blocks are same */
if (first && last_pos == first_pos)
last = false;
/*
* Allocate a read request for one or two extents,
* depending on how the request was aligned.
*/
req = ceph_osdc_new_request(osdc, &ci->i_layout,
ci->i_vino, first ? first_pos : last_pos,
&read_len, 0, (first && last) ? 2 : 1,
CEPH_OSD_OP_SPARSE_READ, CEPH_OSD_FLAG_READ,
NULL, ci->i_truncate_seq,
ci->i_truncate_size, false);
if (IS_ERR(req)) {
ceph_release_page_vector(pages, num_pages);
ret = PTR_ERR(req);
break;
}
/* Something is misaligned! */
if (read_len != CEPH_FSCRYPT_BLOCK_SIZE) {
ceph_osdc_put_request(req);
ceph_release_page_vector(pages, num_pages);
ret = -EIO;
break;
}
/* Add extent for first block? */
op = &req->r_ops[0];
if (first) {
osd_req_op_extent_osd_data_pages(req, 0, pages,
CEPH_FSCRYPT_BLOCK_SIZE,
offset_in_page(first_pos),
false, false);
/* We only expect a single extent here */
ret = __ceph_alloc_sparse_ext_map(op, 1);
if (ret) {
ceph_osdc_put_request(req);
ceph_release_page_vector(pages, num_pages);
break;
}
}
/* Add extent for last block */
if (last) {
/* Init the other extent if first extent has been used */
if (first) {
op = &req->r_ops[1];
osd_req_op_extent_init(req, 1,
CEPH_OSD_OP_SPARSE_READ,
last_pos, CEPH_FSCRYPT_BLOCK_SIZE,
ci->i_truncate_size,
ci->i_truncate_seq);
}
ret = __ceph_alloc_sparse_ext_map(op, 1);
if (ret) {
ceph_osdc_put_request(req);
ceph_release_page_vector(pages, num_pages);
break;
}
osd_req_op_extent_osd_data_pages(req, first ? 1 : 0,
&pages[num_pages - 1],
CEPH_FSCRYPT_BLOCK_SIZE,
offset_in_page(last_pos),
false, false);
}
ceph_osdc_start_request(osdc, req);
ret = ceph_osdc_wait_request(osdc, req);
/* FIXME: length field is wrong if there are 2 extents */
ceph_update_read_metrics(&fsc->mdsc->metric,
req->r_start_latency,
req->r_end_latency,
read_len, ret);
/* Ok if object is not already present */
if (ret == -ENOENT) {
/*
* If there is no object, then we can't assert
* on its version. Set it to 0, and we'll use an
* exclusive create instead.
*/
ceph_osdc_put_request(req);
ret = 0;
/*
* zero out the soon-to-be uncopied parts of the
* first and last pages.
*/
if (first)
zero_user_segment(pages[0], 0,
offset_in_page(first_pos));
if (last)
zero_user_segment(pages[num_pages - 1],
offset_in_page(last_pos),
PAGE_SIZE);
} else {
if (ret < 0) {
ceph_osdc_put_request(req);
ceph_release_page_vector(pages, num_pages);
break;
}
op = &req->r_ops[0];
if (op->extent.sparse_ext_cnt == 0) {
if (first)
zero_user_segment(pages[0], 0,
offset_in_page(first_pos));
else
zero_user_segment(pages[num_pages - 1],
offset_in_page(last_pos),
PAGE_SIZE);
} else if (op->extent.sparse_ext_cnt != 1 ||
ceph_sparse_ext_map_end(op) !=
CEPH_FSCRYPT_BLOCK_SIZE) {
ret = -EIO;
ceph_osdc_put_request(req);
ceph_release_page_vector(pages, num_pages);
break;
}
if (first && last) {
op = &req->r_ops[1];
if (op->extent.sparse_ext_cnt == 0) {
zero_user_segment(pages[num_pages - 1],
offset_in_page(last_pos),
PAGE_SIZE);
} else if (op->extent.sparse_ext_cnt != 1 ||
ceph_sparse_ext_map_end(op) !=
CEPH_FSCRYPT_BLOCK_SIZE) {
ret = -EIO;
ceph_osdc_put_request(req);
ceph_release_page_vector(pages, num_pages);
break;
}
}
/* Grab assert version. It must be non-zero. */
assert_ver = req->r_version;
WARN_ON_ONCE(ret > 0 && assert_ver == 0);
ceph_osdc_put_request(req);
if (first) {
ret = ceph_fscrypt_decrypt_block_inplace(inode,
pages[0], CEPH_FSCRYPT_BLOCK_SIZE,
offset_in_page(first_pos),
first_pos >> CEPH_FSCRYPT_BLOCK_SHIFT);
if (ret < 0) {
ceph_release_page_vector(pages, num_pages);
break;
}
}
if (last) {
ret = ceph_fscrypt_decrypt_block_inplace(inode,
pages[num_pages - 1],
CEPH_FSCRYPT_BLOCK_SIZE,
offset_in_page(last_pos),
last_pos >> CEPH_FSCRYPT_BLOCK_SHIFT);
if (ret < 0) {
ceph_release_page_vector(pages, num_pages);
break;
}
}
}
}
left = len;
off = offset_in_page(pos);
for (n = 0; n < num_pages; n++) {
size_t plen = min_t(size_t, left, PAGE_SIZE - off);
/* copy the data */
ret = copy_page_from_iter(pages[n], off, plen, from);
if (ret != plen) {
ret = -EFAULT;
break;
}
off = 0;
left -= ret;
}
if (ret < 0) {
doutc(cl, "write failed with %d\n", ret);
ceph_release_page_vector(pages, num_pages);
break;
}
if (IS_ENCRYPTED(inode)) {
ret = ceph_fscrypt_encrypt_pages(inode, pages,
write_pos, write_len,
GFP_KERNEL);
if (ret < 0) {
doutc(cl, "encryption failed with %d\n", ret);
ceph_release_page_vector(pages, num_pages);
break;
}
}
req = ceph_osdc_new_request(osdc, &ci->i_layout,
ci->i_vino, write_pos, &write_len,
rmw ? 1 : 0, rmw ? 2 : 1,
CEPH_OSD_OP_WRITE,
CEPH_OSD_FLAG_WRITE,
snapc, ci->i_truncate_seq,
ci->i_truncate_size, false);
if (IS_ERR(req)) {
ret = PTR_ERR(req);
ceph_release_page_vector(pages, num_pages);
break;
}
doutc(cl, "write op %lld~%llu\n", write_pos, write_len);
osd_req_op_extent_osd_data_pages(req, rmw ? 1 : 0, pages, write_len,
offset_in_page(write_pos), false,
true);
req->r_inode = inode;
req->r_mtime = mtime;
/* Set up the assertion */
if (rmw) {
/*
* Set up the assertion. If we don't have a version
* number, then the object doesn't exist yet. Use an
* exclusive create instead of a version assertion in
* that case.
*/
if (assert_ver) {
osd_req_op_init(req, 0, CEPH_OSD_OP_ASSERT_VER, 0);
req->r_ops[0].assert_ver.ver = assert_ver;
} else {
osd_req_op_init(req, 0, CEPH_OSD_OP_CREATE,
CEPH_OSD_OP_FLAG_EXCL);
}
}
ceph_osdc_start_request(osdc, req);
ret = ceph_osdc_wait_request(osdc, req);
ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
req->r_end_latency, len, ret);
ceph_osdc_put_request(req);
if (ret != 0) {
doutc(cl, "osd write returned %d\n", ret);
/* Version changed! Must re-do the rmw cycle */
if ((assert_ver && (ret == -ERANGE || ret == -EOVERFLOW)) ||
(!assert_ver && ret == -EEXIST)) {
/* We should only ever see this on a rmw */
WARN_ON_ONCE(!rmw);
/* The version should never go backward */
WARN_ON_ONCE(ret == -EOVERFLOW);
*from = saved_iter;
/* FIXME: limit number of times we loop? */
continue;
}
ceph_set_error_write(ci);
break;
}
ceph_clear_error_write(ci);
/*
* We successfully wrote to a range of the file. Declare
* that region of the pagecache invalid.
*/
ret = invalidate_inode_pages2_range(
inode->i_mapping,
pos >> PAGE_SHIFT,
(pos + len - 1) >> PAGE_SHIFT);
if (ret < 0) {
doutc(cl, "invalidate_inode_pages2_range returned %d\n",
ret);
ret = 0;
}
pos += len;
written += len;
doutc(cl, "written %d\n", written);
if (pos > i_size_read(inode)) {
check_caps = ceph_inode_set_size(inode, pos);
if (check_caps)
ceph_check_caps(ceph_inode(inode),
CHECK_CAPS_AUTHONLY);
}
}
if (ret != -EOLDSNAPC && written > 0) {
ret = written;
iocb->ki_pos = pos;
}
doutc(cl, "returning %d\n", ret);
return ret;
}
/*
* Wrap generic_file_aio_read with checks for cap bits on the inode.
* Atomically grab references, so that those bits are not released
* back to the MDS mid-read.
*
* Hmm, the sync read case isn't actually async... should it be?
*/
static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
{
struct file *filp = iocb->ki_filp;
struct ceph_file_info *fi = filp->private_data;
size_t len = iov_iter_count(to);
struct inode *inode = file_inode(filp);
struct ceph_inode_info *ci = ceph_inode(inode);
bool direct_lock = iocb->ki_flags & IOCB_DIRECT;
struct ceph_client *cl = ceph_inode_to_client(inode);
ssize_t ret;
int want = 0, got = 0;
int retry_op = 0, read = 0;
again:
doutc(cl, "%llu~%u trying to get caps on %p %llx.%llx\n",
iocb->ki_pos, (unsigned)len, inode, ceph_vinop(inode));
if (ceph_inode_is_shutdown(inode))
return -ESTALE;
if (direct_lock)
ceph_start_io_direct(inode);
else
ceph_start_io_read(inode);
if (!(fi->flags & CEPH_F_SYNC) && !direct_lock)
want |= CEPH_CAP_FILE_CACHE;
if (fi->fmode & CEPH_FILE_MODE_LAZY)
want |= CEPH_CAP_FILE_LAZYIO;
ret = ceph_get_caps(filp, CEPH_CAP_FILE_RD, want, -1, &got);
if (ret < 0) {
if (direct_lock)
ceph_end_io_direct(inode);
else
ceph_end_io_read(inode);
return ret;
}
if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
(iocb->ki_flags & IOCB_DIRECT) ||
(fi->flags & CEPH_F_SYNC)) {
doutc(cl, "sync %p %llx.%llx %llu~%u got cap refs on %s\n",
inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
ceph_cap_string(got));
if (!ceph_has_inline_data(ci)) {
if (!retry_op &&
(iocb->ki_flags & IOCB_DIRECT) &&
!IS_ENCRYPTED(inode)) {
ret = ceph_direct_read_write(iocb, to,
NULL, NULL);
if (ret >= 0 && ret < len)
retry_op = CHECK_EOF;
} else {
ret = ceph_sync_read(iocb, to, &retry_op);
}
} else {
retry_op = READ_INLINE;
}
} else {
CEPH_DEFINE_RW_CONTEXT(rw_ctx, got);
doutc(cl, "async %p %llx.%llx %llu~%u got cap refs on %s\n",
inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
ceph_cap_string(got));
ceph_add_rw_context(fi, &rw_ctx);
ret = generic_file_read_iter(iocb, to);
ceph_del_rw_context(fi, &rw_ctx);
}
doutc(cl, "%p %llx.%llx dropping cap refs on %s = %d\n",
inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
ceph_put_cap_refs(ci, got);
if (direct_lock)
ceph_end_io_direct(inode);
else
ceph_end_io_read(inode);
if (retry_op > HAVE_RETRIED && ret >= 0) {
int statret;
struct page *page = NULL;
loff_t i_size;
int mask = CEPH_STAT_CAP_SIZE;
if (retry_op == READ_INLINE) {
page = __page_cache_alloc(GFP_KERNEL);
if (!page)
return -ENOMEM;
mask = CEPH_STAT_CAP_INLINE_DATA;
}
statret = __ceph_do_getattr(inode, page, mask, !!page);
if (statret < 0) {
if (page)
__free_page(page);
if (statret == -ENODATA) {
BUG_ON(retry_op != READ_INLINE);
goto again;
}
return statret;
}
i_size = i_size_read(inode);
if (retry_op == READ_INLINE) {
BUG_ON(ret > 0 || read > 0);
if (iocb->ki_pos < i_size &&
iocb->ki_pos < PAGE_SIZE) {
loff_t end = min_t(loff_t, i_size,
iocb->ki_pos + len);
end = min_t(loff_t, end, PAGE_SIZE);
if (statret < end)
zero_user_segment(page, statret, end);
ret = copy_page_to_iter(page,
iocb->ki_pos & ~PAGE_MASK,
end - iocb->ki_pos, to);
iocb->ki_pos += ret;
read += ret;
}
if (iocb->ki_pos < i_size && read < len) {
size_t zlen = min_t(size_t, len - read,
i_size - iocb->ki_pos);
ret = iov_iter_zero(zlen, to);
iocb->ki_pos += ret;
read += ret;
}
__free_pages(page, 0);
return read;
}
/* hit EOF or hole? */
if (retry_op == CHECK_EOF && iocb->ki_pos < i_size &&
ret < len) {
doutc(cl, "may hit hole, ppos %lld < size %lld, reading more\n",
iocb->ki_pos, i_size);
read += ret;
len -= ret;
retry_op = HAVE_RETRIED;
goto again;
}
}
if (ret >= 0)
ret += read;
return ret;
}
/*
* Wrap filemap_splice_read with checks for cap bits on the inode.
* Atomically grab references, so that those bits are not released
* back to the MDS mid-read.
*/
static ssize_t ceph_splice_read(struct file *in, loff_t *ppos,
struct pipe_inode_info *pipe,
size_t len, unsigned int flags)
{
struct ceph_file_info *fi = in->private_data;
struct inode *inode = file_inode(in);
struct ceph_inode_info *ci = ceph_inode(inode);
ssize_t ret;
int want = 0, got = 0;
CEPH_DEFINE_RW_CONTEXT(rw_ctx, 0);
dout("splice_read %p %llx.%llx %llu~%zu trying to get caps on %p\n",
inode, ceph_vinop(inode), *ppos, len, inode);
if (ceph_inode_is_shutdown(inode))
return -ESTALE;
if (ceph_has_inline_data(ci) ||
(fi->flags & CEPH_F_SYNC))
return copy_splice_read(in, ppos, pipe, len, flags);
ceph_start_io_read(inode);
want = CEPH_CAP_FILE_CACHE;
if (fi->fmode & CEPH_FILE_MODE_LAZY)
want |= CEPH_CAP_FILE_LAZYIO;
ret = ceph_get_caps(in, CEPH_CAP_FILE_RD, want, -1, &got);
if (ret < 0)
goto out_end;
if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) == 0) {
dout("splice_read/sync %p %llx.%llx %llu~%zu got cap refs on %s\n",
inode, ceph_vinop(inode), *ppos, len,
ceph_cap_string(got));
ceph_put_cap_refs(ci, got);
ceph_end_io_read(inode);
return copy_splice_read(in, ppos, pipe, len, flags);
}
dout("splice_read %p %llx.%llx %llu~%zu got cap refs on %s\n",
inode, ceph_vinop(inode), *ppos, len, ceph_cap_string(got));
rw_ctx.caps = got;
ceph_add_rw_context(fi, &rw_ctx);
ret = filemap_splice_read(in, ppos, pipe, len, flags);
ceph_del_rw_context(fi, &rw_ctx);
dout("splice_read %p %llx.%llx dropping cap refs on %s = %zd\n",
inode, ceph_vinop(inode), ceph_cap_string(got), ret);
ceph_put_cap_refs(ci, got);
out_end:
ceph_end_io_read(inode);
return ret;
}
/*
* Take cap references to avoid releasing caps to MDS mid-write.
*
* If we are synchronous, and write with an old snap context, the OSD
* may return EOLDSNAPC. In that case, retry the write.. _after_
* dropping our cap refs and allowing the pending snap to logically
* complete _before_ this write occurs.
*
* If we are near ENOSPC, write synchronously.
*/
static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
{
struct file *file = iocb->ki_filp;
struct ceph_file_info *fi = file->private_data;
struct inode *inode = file_inode(file);
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
struct ceph_client *cl = fsc->client;
struct ceph_osd_client *osdc = &fsc->client->osdc;
struct ceph_cap_flush *prealloc_cf;
ssize_t count, written = 0;
int err, want = 0, got;
bool direct_lock = false;
u32 map_flags;
u64 pool_flags;
loff_t pos;
loff_t limit = max(i_size_read(inode), fsc->max_file_size);
if (ceph_inode_is_shutdown(inode))
return -ESTALE;
if (ceph_snap(inode) != CEPH_NOSNAP)
return -EROFS;
prealloc_cf = ceph_alloc_cap_flush();
if (!prealloc_cf)
return -ENOMEM;
if ((iocb->ki_flags & (IOCB_DIRECT | IOCB_APPEND)) == IOCB_DIRECT)
direct_lock = true;
retry_snap:
if (direct_lock)
ceph_start_io_direct(inode);
else
ceph_start_io_write(inode);
if (iocb->ki_flags & IOCB_APPEND) {
err = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
if (err < 0)
goto out;
}
err = generic_write_checks(iocb, from);
if (err <= 0)
goto out;
pos = iocb->ki_pos;
if (unlikely(pos >= limit)) {
err = -EFBIG;
goto out;
} else {
iov_iter_truncate(from, limit - pos);
}
count = iov_iter_count(from);
if (ceph_quota_is_max_bytes_exceeded(inode, pos + count)) {
err = -EDQUOT;
goto out;
}
down_read(&osdc->lock);
map_flags = osdc->osdmap->flags;
pool_flags = ceph_pg_pool_flags(osdc->osdmap, ci->i_layout.pool_id);
up_read(&osdc->lock);
if ((map_flags & CEPH_OSDMAP_FULL) ||
(pool_flags & CEPH_POOL_FLAG_FULL)) {
err = -ENOSPC;
goto out;
}
err = file_remove_privs(file);
if (err)
goto out;
doutc(cl, "%p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
inode, ceph_vinop(inode), pos, count,
i_size_read(inode));
if (!(fi->flags & CEPH_F_SYNC) && !direct_lock)
want |= CEPH_CAP_FILE_BUFFER;
if (fi->fmode & CEPH_FILE_MODE_LAZY)
want |= CEPH_CAP_FILE_LAZYIO;
got = 0;
err = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, pos + count, &got);
if (err < 0)
goto out;
err = file_update_time(file);
if (err)
goto out_caps;
inode_inc_iversion_raw(inode);
doutc(cl, "%p %llx.%llx %llu~%zd got cap refs on %s\n",
inode, ceph_vinop(inode), pos, count, ceph_cap_string(got));
if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
(iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC) ||
(ci->i_ceph_flags & CEPH_I_ERROR_WRITE)) {
struct ceph_snap_context *snapc;
struct iov_iter data;
spin_lock(&ci->i_ceph_lock);
if (__ceph_have_pending_cap_snap(ci)) {
struct ceph_cap_snap *capsnap =
list_last_entry(&ci->i_cap_snaps,
struct ceph_cap_snap,
ci_item);
snapc = ceph_get_snap_context(capsnap->context);
} else {
BUG_ON(!ci->i_head_snapc);
snapc = ceph_get_snap_context(ci->i_head_snapc);
}
spin_unlock(&ci->i_ceph_lock);
/* we might need to revert back to that point */
data = *from;
if ((iocb->ki_flags & IOCB_DIRECT) && !IS_ENCRYPTED(inode))
written = ceph_direct_read_write(iocb, &data, snapc,
&prealloc_cf);
else
written = ceph_sync_write(iocb, &data, pos, snapc);
if (direct_lock)
ceph_end_io_direct(inode);
else
ceph_end_io_write(inode);
if (written > 0)
iov_iter_advance(from, written);
ceph_put_snap_context(snapc);
} else {
/*
* No need to acquire the i_truncate_mutex. Because
* the MDS revokes Fwb caps before sending truncate
* message to us. We can't get Fwb cap while there
* are pending vmtruncate. So write and vmtruncate
* can not run at the same time
*/
written = generic_perform_write(iocb, from);
ceph_end_io_write(inode);
}
if (written >= 0) {
int dirty;
spin_lock(&ci->i_ceph_lock);
dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
&prealloc_cf);
spin_unlock(&ci->i_ceph_lock);
if (dirty)
__mark_inode_dirty(inode, dirty);
if (ceph_quota_is_max_bytes_approaching(inode, iocb->ki_pos))
ceph_check_caps(ci, CHECK_CAPS_FLUSH);
}
doutc(cl, "%p %llx.%llx %llu~%u dropping cap refs on %s\n",
inode, ceph_vinop(inode), pos, (unsigned)count,
ceph_cap_string(got));
ceph_put_cap_refs(ci, got);
if (written == -EOLDSNAPC) {
doutc(cl, "%p %llx.%llx %llu~%u" "got EOLDSNAPC, retrying\n",
inode, ceph_vinop(inode), pos, (unsigned)count);
goto retry_snap;
}
if (written >= 0) {
if ((map_flags & CEPH_OSDMAP_NEARFULL) ||
(pool_flags & CEPH_POOL_FLAG_NEARFULL))
iocb->ki_flags |= IOCB_DSYNC;
written = generic_write_sync(iocb, written);
}
goto out_unlocked;
out_caps:
ceph_put_cap_refs(ci, got);
out:
if (direct_lock)
ceph_end_io_direct(inode);
else
ceph_end_io_write(inode);
out_unlocked:
ceph_free_cap_flush(prealloc_cf);
return written ? written : err;
}
/*
* llseek. be sure to verify file size on SEEK_END.
*/
static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
{
if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
struct inode *inode = file_inode(file);
int ret;
ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
if (ret < 0)
return ret;
}
return generic_file_llseek(file, offset, whence);
}
static inline void ceph_zero_partial_page(
struct inode *inode, loff_t offset, unsigned size)
{
struct page *page;
pgoff_t index = offset >> PAGE_SHIFT;
page = find_lock_page(inode->i_mapping, index);
if (page) {
wait_on_page_writeback(page);
zero_user(page, offset & (PAGE_SIZE - 1), size);
unlock_page(page);
put_page(page);
}
}
static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
loff_t length)
{
loff_t nearly = round_up(offset, PAGE_SIZE);
if (offset < nearly) {
loff_t size = nearly - offset;
if (length < size)
size = length;
ceph_zero_partial_page(inode, offset, size);
offset += size;
length -= size;
}
if (length >= PAGE_SIZE) {
loff_t size = round_down(length, PAGE_SIZE);
truncate_pagecache_range(inode, offset, offset + size - 1);
offset += size;
length -= size;
}
if (length)
ceph_zero_partial_page(inode, offset, length);
}
static int ceph_zero_partial_object(struct inode *inode,
loff_t offset, loff_t *length)
{
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
struct ceph_osd_request *req;
int ret = 0;
loff_t zero = 0;
int op;
if (ceph_inode_is_shutdown(inode))
return -EIO;
if (!length) {
op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
length = &zero;
} else {
op = CEPH_OSD_OP_ZERO;
}
req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
ceph_vino(inode),
offset, length,
0, 1, op,
CEPH_OSD_FLAG_WRITE,
NULL, 0, 0, false);
if (IS_ERR(req)) {
ret = PTR_ERR(req);
goto out;
}
req->r_mtime = inode_get_mtime(inode);
ceph_osdc_start_request(&fsc->client->osdc, req);
ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
if (ret == -ENOENT)
ret = 0;
ceph_osdc_put_request(req);
out:
return ret;
}
static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
{
int ret = 0;
struct ceph_inode_info *ci = ceph_inode(inode);
s32 stripe_unit = ci->i_layout.stripe_unit;
s32 stripe_count = ci->i_layout.stripe_count;
s32 object_size = ci->i_layout.object_size;
u64 object_set_size = object_size * stripe_count;
u64 nearly, t;
/* round offset up to next period boundary */
nearly = offset + object_set_size - 1;
t = nearly;
nearly -= do_div(t, object_set_size);
while (length && offset < nearly) {
loff_t size = length;
ret = ceph_zero_partial_object(inode, offset, &size);
if (ret < 0)
return ret;
offset += size;
length -= size;
}
while (length >= object_set_size) {
int i;
loff_t pos = offset;
for (i = 0; i < stripe_count; ++i) {
ret = ceph_zero_partial_object(inode, pos, NULL);
if (ret < 0)
return ret;
pos += stripe_unit;
}
offset += object_set_size;
length -= object_set_size;
}
while (length) {
loff_t size = length;
ret = ceph_zero_partial_object(inode, offset, &size);
if (ret < 0)
return ret;
offset += size;
length -= size;
}
return ret;
}
static long ceph_fallocate(struct file *file, int mode,
loff_t offset, loff_t length)
{
struct ceph_file_info *fi = file->private_data;
struct inode *inode = file_inode(file);
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_cap_flush *prealloc_cf;
struct ceph_client *cl = ceph_inode_to_client(inode);
int want, got = 0;
int dirty;
int ret = 0;
loff_t endoff = 0;
loff_t size;
doutc(cl, "%p %llx.%llx mode %x, offset %llu length %llu\n",
inode, ceph_vinop(inode), mode, offset, length);
if (mode != (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
return -EOPNOTSUPP;
if (!S_ISREG(inode->i_mode))
return -EOPNOTSUPP;
if (IS_ENCRYPTED(inode))
return -EOPNOTSUPP;
prealloc_cf = ceph_alloc_cap_flush();
if (!prealloc_cf)
return -ENOMEM;
inode_lock(inode);
if (ceph_snap(inode) != CEPH_NOSNAP) {
ret = -EROFS;
goto unlock;
}
size = i_size_read(inode);
/* Are we punching a hole beyond EOF? */
if (offset >= size)
goto unlock;
if ((offset + length) > size)
length = size - offset;
if (fi->fmode & CEPH_FILE_MODE_LAZY)
want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
else
want = CEPH_CAP_FILE_BUFFER;
ret = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, endoff, &got);
if (ret < 0)
goto unlock;
ret = file_modified(file);
if (ret)
goto put_caps;
filemap_invalidate_lock(inode->i_mapping);
ceph_fscache_invalidate(inode, false);
ceph_zero_pagecache_range(inode, offset, length);
ret = ceph_zero_objects(inode, offset, length);
if (!ret) {
spin_lock(&ci->i_ceph_lock);
dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
&prealloc_cf);
spin_unlock(&ci->i_ceph_lock);
if (dirty)
__mark_inode_dirty(inode, dirty);
}
filemap_invalidate_unlock(inode->i_mapping);
put_caps:
ceph_put_cap_refs(ci, got);
unlock:
inode_unlock(inode);
ceph_free_cap_flush(prealloc_cf);
return ret;
}
/*
* This function tries to get FILE_WR capabilities for dst_ci and FILE_RD for
* src_ci. Two attempts are made to obtain both caps, and an error is return if
* this fails; zero is returned on success.
*/
static int get_rd_wr_caps(struct file *src_filp, int *src_got,
struct file *dst_filp,
loff_t dst_endoff, int *dst_got)
{
int ret = 0;
bool retrying = false;
retry_caps:
ret = ceph_get_caps(dst_filp, CEPH_CAP_FILE_WR, CEPH_CAP_FILE_BUFFER,
dst_endoff, dst_got);
if (ret < 0)
return ret;
/*
* Since we're already holding the FILE_WR capability for the dst file,
* we would risk a deadlock by using ceph_get_caps. Thus, we'll do some
* retry dance instead to try to get both capabilities.
*/
ret = ceph_try_get_caps(file_inode(src_filp),
CEPH_CAP_FILE_RD, CEPH_CAP_FILE_SHARED,
false, src_got);
if (ret <= 0) {
/* Start by dropping dst_ci caps and getting src_ci caps */
ceph_put_cap_refs(ceph_inode(file_inode(dst_filp)), *dst_got);
if (retrying) {
if (!ret)
/* ceph_try_get_caps masks EAGAIN */
ret = -EAGAIN;
return ret;
}
ret = ceph_get_caps(src_filp, CEPH_CAP_FILE_RD,
CEPH_CAP_FILE_SHARED, -1, src_got);
if (ret < 0)
return ret;
/*... drop src_ci caps too, and retry */
ceph_put_cap_refs(ceph_inode(file_inode(src_filp)), *src_got);
retrying = true;
goto retry_caps;
}
return ret;
}
static void put_rd_wr_caps(struct ceph_inode_info *src_ci, int src_got,
struct ceph_inode_info *dst_ci, int dst_got)
{
ceph_put_cap_refs(src_ci, src_got);
ceph_put_cap_refs(dst_ci, dst_got);
}
/*
* This function does several size-related checks, returning an error if:
* - source file is smaller than off+len
* - destination file size is not OK (inode_newsize_ok())
* - max bytes quotas is exceeded
*/
static int is_file_size_ok(struct inode *src_inode, struct inode *dst_inode,
loff_t src_off, loff_t dst_off, size_t len)
{
struct ceph_client *cl = ceph_inode_to_client(src_inode);
loff_t size, endoff;
size = i_size_read(src_inode);
/*
* Don't copy beyond source file EOF. Instead of simply setting length
* to (size - src_off), just drop to VFS default implementation, as the
* local i_size may be stale due to other clients writing to the source
* inode.
*/
if (src_off + len > size) {
doutc(cl, "Copy beyond EOF (%llu + %zu > %llu)\n", src_off,
len, size);
return -EOPNOTSUPP;
}
size = i_size_read(dst_inode);
endoff = dst_off + len;
if (inode_newsize_ok(dst_inode, endoff))
return -EOPNOTSUPP;
if (ceph_quota_is_max_bytes_exceeded(dst_inode, endoff))
return -EDQUOT;
return 0;
}
static struct ceph_osd_request *
ceph_alloc_copyfrom_request(struct ceph_osd_client *osdc,
u64 src_snapid,
struct ceph_object_id *src_oid,
struct ceph_object_locator *src_oloc,
struct ceph_object_id *dst_oid,
struct ceph_object_locator *dst_oloc,
u32 truncate_seq, u64 truncate_size)
{
struct ceph_osd_request *req;
int ret;
u32 src_fadvise_flags =
CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
CEPH_OSD_OP_FLAG_FADVISE_NOCACHE;
u32 dst_fadvise_flags =
CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
CEPH_OSD_OP_FLAG_FADVISE_DONTNEED;
req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_KERNEL);
if (!req)
return ERR_PTR(-ENOMEM);
req->r_flags = CEPH_OSD_FLAG_WRITE;
ceph_oloc_copy(&req->r_t.base_oloc, dst_oloc);
ceph_oid_copy(&req->r_t.base_oid, dst_oid);
ret = osd_req_op_copy_from_init(req, src_snapid, 0,
src_oid, src_oloc,
src_fadvise_flags,
dst_fadvise_flags,
truncate_seq,
truncate_size,
CEPH_OSD_COPY_FROM_FLAG_TRUNCATE_SEQ);
if (ret)
goto out;
ret = ceph_osdc_alloc_messages(req, GFP_KERNEL);
if (ret)
goto out;
return req;
out:
ceph_osdc_put_request(req);
return ERR_PTR(ret);
}
static ssize_t ceph_do_objects_copy(struct ceph_inode_info *src_ci, u64 *src_off,
struct ceph_inode_info *dst_ci, u64 *dst_off,
struct ceph_fs_client *fsc,
size_t len, unsigned int flags)
{
struct ceph_object_locator src_oloc, dst_oloc;
struct ceph_object_id src_oid, dst_oid;
struct ceph_osd_client *osdc;
struct ceph_osd_request *req;
size_t bytes = 0;
u64 src_objnum, src_objoff, dst_objnum, dst_objoff;
u32 src_objlen, dst_objlen;
u32 object_size = src_ci->i_layout.object_size;
struct ceph_client *cl = fsc->client;
int ret;
src_oloc.pool = src_ci->i_layout.pool_id;
src_oloc.pool_ns = ceph_try_get_string(src_ci->i_layout.pool_ns);
dst_oloc.pool = dst_ci->i_layout.pool_id;
dst_oloc.pool_ns = ceph_try_get_string(dst_ci->i_layout.pool_ns);
osdc = &fsc->client->osdc;
while (len >= object_size) {
ceph_calc_file_object_mapping(&src_ci->i_layout, *src_off,
object_size, &src_objnum,
&src_objoff, &src_objlen);
ceph_calc_file_object_mapping(&dst_ci->i_layout, *dst_off,
object_size, &dst_objnum,
&dst_objoff, &dst_objlen);
ceph_oid_init(&src_oid);
ceph_oid_printf(&src_oid, "%llx.%08llx",
src_ci->i_vino.ino, src_objnum);
ceph_oid_init(&dst_oid);
ceph_oid_printf(&dst_oid, "%llx.%08llx",
dst_ci->i_vino.ino, dst_objnum);
/* Do an object remote copy */
req = ceph_alloc_copyfrom_request(osdc, src_ci->i_vino.snap,
&src_oid, &src_oloc,
&dst_oid, &dst_oloc,
dst_ci->i_truncate_seq,
dst_ci->i_truncate_size);
if (IS_ERR(req))
ret = PTR_ERR(req);
else {
ceph_osdc_start_request(osdc, req);
ret = ceph_osdc_wait_request(osdc, req);
ceph_update_copyfrom_metrics(&fsc->mdsc->metric,
req->r_start_latency,
req->r_end_latency,
object_size, ret);
ceph_osdc_put_request(req);
}
if (ret) {
if (ret == -EOPNOTSUPP) {
fsc->have_copy_from2 = false;
pr_notice_client(cl,
"OSDs don't support copy-from2; disabling copy offload\n");
}
doutc(cl, "returned %d\n", ret);
if (!bytes)
bytes = ret;
goto out;
}
len -= object_size;
bytes += object_size;
*src_off += object_size;
*dst_off += object_size;
}
out:
ceph_oloc_destroy(&src_oloc);
ceph_oloc_destroy(&dst_oloc);
return bytes;
}
static ssize_t __ceph_copy_file_range(struct file *src_file, loff_t src_off,
struct file *dst_file, loff_t dst_off,
size_t len, unsigned int flags)
{
struct inode *src_inode = file_inode(src_file);
struct inode *dst_inode = file_inode(dst_file);
struct ceph_inode_info *src_ci = ceph_inode(src_inode);
struct ceph_inode_info *dst_ci = ceph_inode(dst_inode);
struct ceph_cap_flush *prealloc_cf;
struct ceph_fs_client *src_fsc = ceph_inode_to_fs_client(src_inode);
struct ceph_client *cl = src_fsc->client;
loff_t size;
ssize_t ret = -EIO, bytes;
u64 src_objnum, dst_objnum, src_objoff, dst_objoff;
u32 src_objlen, dst_objlen;
int src_got = 0, dst_got = 0, err, dirty;
if (src_inode->i_sb != dst_inode->i_sb) {
struct ceph_fs_client *dst_fsc = ceph_inode_to_fs_client