| // 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 "super.h" |
| #include "mds_client.h" |
| #include "cache.h" |
| #include "io.h" |
| #include "metric.h" |
| |
| static __le32 ceph_flags_sys2wire(u32 flags) |
| { |
| 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) |
| dout("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(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_client(&ci->netfs.inode)->mount_options; |
| struct ceph_file_info *fi; |
| int ret; |
| |
| dout("%s %p %p 0%o (%s)\n", __func__, 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_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) |
| { |
| 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: |
| dout("init_file %p %p 0%o (symlink)\n", inode, file, |
| inode->i_mode); |
| break; |
| |
| default: |
| dout("init_file %p %p 0%o (special)\n", 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_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); |
| dout("renew caps %p want %s issued %s updating mds_wanted\n", |
| 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: |
| dout("renew caps %p open result=%d\n", 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_client(inode->i_sb); |
| 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; |
| |
| if (fi) { |
| dout("open 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 */ |
| |
| dout("open inode %p ino %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); |
| |
| /* 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 (__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); |
| |
| dout("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 (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); |
| |
| dout("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); |
| dout("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_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("ceph: 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 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(req->r_dentry, &pathlen, |
| &base, 0); |
| |
| pr_warn("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("%s: inode number mismatch! err=%d deleg_ino=0x%llx target=0x%llx\n", |
| __func__, 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("%s: no req->r_target_inode for 0x%llx\n", __func__, |
| req->r_deleg_ino); |
| } |
| out: |
| ceph_mdsc_release_dir_caps(req); |
| } |
| |
| static int ceph_finish_async_create(struct inode *dir, 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 inode *inode; |
| struct timespec64 now; |
| struct ceph_string *pool_ns; |
| struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb); |
| struct ceph_vino vino = { .ino = req->r_deleg_ino, |
| .snap = CEPH_NOSNAP }; |
| |
| ktime_get_real_ts64(&now); |
| |
| inode = ceph_get_inode(dentry->d_sb, vino); |
| if (IS_ERR(inode)) |
| return PTR_ERR(inode); |
| |
| 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, current_fsuid())); |
| 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, current_fsgid())); |
| } |
| 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) { |
| dout("%s failed to fill inode: %d\n", __func__, ret); |
| ceph_dir_clear_complete(dir); |
| if (!d_unhashed(dentry)) |
| d_drop(dentry); |
| if (inode->i_state & I_NEW) |
| discard_new_inode(inode); |
| } else { |
| struct dentry *dn; |
| |
| dout("%s d_adding new inode 0x%llx to 0x%llx/%s\n", __func__, |
| 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 ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
| struct ceph_mds_client *mdsc = fsc->mdsc; |
| struct ceph_mds_request *req; |
| struct dentry *dn; |
| struct ceph_acl_sec_ctx as_ctx = {}; |
| bool try_async = ceph_test_mount_opt(fsc, ASYNC_DIROPS); |
| int mask; |
| int err; |
| |
| dout("atomic_open %p dentry %p '%pd' %s flags %d mode 0%o\n", |
| 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; |
| |
| if (flags & O_CREAT) { |
| if (ceph_quota_is_max_files_exceeded(dir)) |
| return -EDQUOT; |
| err = ceph_pre_init_acls(dir, &mode, &as_ctx); |
| if (err < 0) |
| return err; |
| err = ceph_security_init_secctx(dentry, mode, &as_ctx); |
| if (err < 0) |
| 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; |
| } |
| retry: |
| /* 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; |
| ihold(dir); |
| |
| if (flags & O_CREAT) { |
| struct ceph_file_layout lo; |
| |
| req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL; |
| req->r_dentry_unless = CEPH_CAP_FILE_EXCL; |
| if (as_ctx.pagelist) { |
| req->r_pagelist = as_ctx.pagelist; |
| as_ctx.pagelist = NULL; |
| } |
| if (try_async && |
| (req->r_dir_caps = |
| try_prep_async_create(dir, dentry, &lo, |
| &req->r_deleg_ino))) { |
| 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; |
| |
| 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, dentry, |
| file, mode, req, |
| &as_ctx, &lo); |
| } else if (err == -EJUKEBOX) { |
| restore_deleg_ino(dir, req->r_deleg_ino); |
| ceph_mdsc_put_request(req); |
| 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); |
| 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 */ |
| dout("atomic_open finish_no_open on dn %p\n", dn); |
| err = finish_no_open(file, dn); |
| } else { |
| dout("atomic_open 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); |
| out_ctx: |
| ceph_release_acl_sec_ctx(&as_ctx); |
| dout("atomic_open result=%d\n", err); |
| return err; |
| } |
| |
| int ceph_release(struct inode *inode, struct file *file) |
| { |
| struct ceph_inode_info *ci = ceph_inode(inode); |
| |
| if (S_ISDIR(inode->i_mode)) { |
| struct ceph_dir_file_info *dfi = file->private_data; |
| dout("release inode %p dir file %p\n", 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; |
| dout("release inode %p regular file %p\n", 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. |
| */ |
| 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_inode_info *ci = ceph_inode(inode); |
| struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
| struct ceph_osd_client *osdc = &fsc->client->osdc; |
| ssize_t ret; |
| u64 off = iocb->ki_pos; |
| u64 len = iov_iter_count(to); |
| u64 i_size = i_size_read(inode); |
| |
| dout("sync_read on file %p %llu~%u %s\n", file, off, (unsigned)len, |
| (file->f_flags & O_DIRECT) ? "O_DIRECT" : ""); |
| |
| 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; |
| |
| req = ceph_osdc_new_request(osdc, &ci->i_layout, |
| ci->i_vino, off, &len, 0, 1, |
| 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; |
| } |
| |
| more = len < iov_iter_count(to); |
| |
| num_pages = calc_pages_for(off, len); |
| page_off = off & ~PAGE_MASK; |
| 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, len, page_off, |
| false, false); |
| 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, |
| len, ret); |
| |
| ceph_osdc_put_request(req); |
| |
| i_size = i_size_read(inode); |
| dout("sync_read %llu~%llu got %zd i_size %llu%s\n", |
| off, len, ret, i_size, (more ? " MORE" : "")); |
| |
| if (ret == -ENOENT) |
| ret = 0; |
| if (ret >= 0 && ret < len && (off + ret < i_size)) { |
| int zlen = min(len - ret, i_size - off - ret); |
| int zoff = page_off + ret; |
| dout("sync_read zero gap %llu~%llu\n", |
| off + ret, off + ret + zlen); |
| ceph_zero_page_vector_range(zoff, zlen, pages); |
| ret += zlen; |
| } |
| |
| idx = 0; |
| left = ret > 0 ? ret : 0; |
| while (left > 0) { |
| size_t len, copied; |
| page_off = off & ~PAGE_MASK; |
| len = min_t(size_t, left, PAGE_SIZE - page_off); |
| SetPageUptodate(pages[idx]); |
| copied = copy_page_to_iter(pages[idx++], |
| page_off, len, to); |
| off += copied; |
| left -= copied; |
| if (copied < len) { |
| 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 (off > iocb->ki_pos) { |
| if (off >= i_size) { |
| *retry_op = CHECK_EOF; |
| ret = i_size - iocb->ki_pos; |
| iocb->ki_pos = i_size; |
| } else { |
| ret = off - iocb->ki_pos; |
| iocb->ki_pos = off; |
| } |
| } |
| |
| dout("sync_read result %zd retry_op %d\n", ret, *retry_op); |
| return ret; |
| } |
| |
| 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_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; |
| |
| dout("ceph_aio_complete %p rc %d\n", 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_client_metric *metric = &ceph_sb_to_mdsc(inode->i_sb)->metric; |
| unsigned int len = osd_data->bvec_pos.iter.bi_size; |
| |
| BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_BVECS); |
| BUG_ON(!osd_data->num_bvecs); |
| |
| dout("ceph_aio_complete_req %p rc %d bytes %u\n", 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_client(inode)->inode_wq, |
| &aio_work->work); |
| return; |
| } |
| rc = -ENOMEM; |
| } else if (!aio_req->write) { |
| 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_client(inode); |
| 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); |
| |
| if (write && ceph_snap(file_inode(file)) != CEPH_NOSNAP) |
| return -EROFS; |
| |
| dout("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) |
| dout("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; |
| |
| 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 : |
| CEPH_OSD_OP_READ, |
| 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); |
| |
| 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 (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_client(inode); |
| struct ceph_vino vino; |
| struct ceph_osd_request *req; |
| struct page **pages; |
| u64 len; |
| int num_pages; |
| int written = 0; |
| int flags; |
| 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; |
| |
| dout("sync_write 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); |
| ret = invalidate_inode_pages2_range(inode->i_mapping, |
| pos >> PAGE_SHIFT, |
| (pos + count - 1) >> PAGE_SHIFT); |
| if (ret < 0) |
| dout("invalidate_inode_pages2_range returned %d\n", ret); |
| |
| flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE; |
| |
| while ((len = iov_iter_count(from)) > 0) { |
| size_t left; |
| int n; |
| |
| vino = ceph_vino(inode); |
| req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, |
| vino, pos, &len, 0, 1, |
| CEPH_OSD_OP_WRITE, flags, snapc, |
| ci->i_truncate_seq, |
| ci->i_truncate_size, |
| false); |
| if (IS_ERR(req)) { |
| ret = PTR_ERR(req); |
| break; |
| } |
| |
| /* |
| * write from beginning of first page, |
| * regardless of io alignment |
| */ |
| num_pages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
| |
| pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); |
| if (IS_ERR(pages)) { |
| ret = PTR_ERR(pages); |
| goto out; |
| } |
| |
| left = len; |
| for (n = 0; n < num_pages; n++) { |
| size_t plen = min_t(size_t, left, PAGE_SIZE); |
| ret = copy_page_from_iter(pages[n], 0, plen, from); |
| if (ret != plen) { |
| ret = -EFAULT; |
| break; |
| } |
| left -= ret; |
| } |
| |
| if (ret < 0) { |
| ceph_release_page_vector(pages, num_pages); |
| goto out; |
| } |
| |
| req->r_inode = inode; |
| |
| osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, |
| false, true); |
| |
| req->r_mtime = mtime; |
| ceph_osdc_start_request(&fsc->client->osdc, req); |
| ret = ceph_osdc_wait_request(&fsc->client->osdc, req); |
| |
| ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency, |
| req->r_end_latency, len, ret); |
| out: |
| ceph_osdc_put_request(req); |
| if (ret != 0) { |
| ceph_set_error_write(ci); |
| break; |
| } |
| |
| ceph_clear_error_write(ci); |
| pos += len; |
| written += len; |
| 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; |
| } |
| 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; |
| ssize_t ret; |
| int want = 0, got = 0; |
| int retry_op = 0, read = 0; |
| |
| again: |
| dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n", |
| inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, 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)) { |
| |
| dout("aio_sync_read %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)) { |
| 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); |
| dout("aio_read %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); |
| } |
| |
| dout("aio_read %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; |
| if (retry_op == READ_INLINE) { |
| page = __page_cache_alloc(GFP_KERNEL); |
| if (!page) |
| return -ENOMEM; |
| } |
| |
| statret = __ceph_do_getattr(inode, page, |
| CEPH_STAT_CAP_INLINE_DATA, !!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) { |
| dout("sync_read 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; |
| } |
| |
| /* |
| * 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_client(inode); |
| 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); |
| |
| /* We can write back this queue in page reclaim */ |
| current->backing_dev_info = inode_to_bdi(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; |
| |
| dout("aio_write %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); |
| |
| dout("aio_write %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) |
| 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); |
| if (likely(written >= 0)) |
| iocb->ki_pos = pos + written; |
| 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); |
| } |
| |
| dout("aio_write %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) { |
| dout("aio_write %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); |
| current->backing_dev_info = NULL; |
| 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_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->i_mtime; |
| 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; |
| int want, got = 0; |
| int dirty; |
| int ret = 0; |
| loff_t endoff = 0; |
| loff_t size; |
| |
| if (mode != (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) |
| return -EOPNOTSUPP; |
| |
| if (!S_ISREG(inode->i_mode)) |
| 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; |
| |
| 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); |
| |
| 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) |
| { |
| 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) { |
| dout("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; |
| 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("OSDs don't support copy-from2; disabling copy offload\n"); |
| } |
| dout("ceph_osdc_copy_from 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_client(src_inode); |
| 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_client(dst_inode); |
| |
| if (ceph_fsid_compare(&src_fsc->client->fsid, |
| &dst_fsc->client->fsid)) { |
| dout("Copying files across clusters: src: %pU dst: %pU\n", |
| &src_fsc->client->fsid, &dst_fsc->client->fsid); |
| return -EXDEV; |
| } |
| } |
| if (ceph_snap(dst_inode) != CEPH_NOSNAP) |
| return -EROFS; |
| |
| /* |
| * Some of the checks below will return -EOPNOTSUPP, which will force a |
| * fallback to the default VFS copy_file_range implementation. This is |
| * desirable in several cases (for ex, the 'len' is smaller than the |
| * size of the objects, or in cases where that would be more |
| * efficient). |
| */ |
| |
| if (ceph_test_mount_opt(src_fsc, NOCOPYFROM)) |
| return -EOPNOTSUPP; |
| |
| if (!src_fsc->have_copy_from2) |
| return -EOPNOTSUPP; |
| |
| /* |
| * Striped file layouts require that we copy partial objects, but the |
| * OSD copy-from operation only supports full-object copies. Limit |
| * this to non-striped file layouts for now. |
| */ |
| if ((src_ci->i_layout.stripe_unit != dst_ci->i_layout.stripe_unit) || |
| (src_ci->i_layout.stripe_count != 1) || |
| (dst_ci->i_layout.stripe_count != 1) || |
| (src_ci->i_layout.object_size != dst_ci->i_layout.object_size)) { |
| dout("Invalid src/dst files layout\n"); |
| return -EOPNOTSUPP; |
| } |
| |
| if (len < src_ci->i_layout.object_size) |
| return -EOPNOTSUPP; /* no remote copy will be done */ |
| |
| prealloc_cf = ceph_alloc_cap_flush(); |
| if (!prealloc_cf) |
| return -ENOMEM; |
| |
| /* Start by sync'ing the source and destination files */ |
| ret = file_write_and_wait_range(src_file, src_off, (src_off + len)); |
| if (ret < 0) { |
| dout("failed to write src file (%zd)\n", ret); |
| goto out; |
| } |
| ret = file_write_and_wait_range(dst_file, dst_off, (dst_off + len)); |
| if (ret < 0) { |
| dout("failed to write dst file (%zd)\n", ret); |
| goto out; |
| } |
| |
| /* |
| * We need FILE_WR caps for dst_ci and FILE_RD for src_ci as other |
| * clients may have dirty data in their caches. And OSDs know nothing |
| * about caps, so they can't safely do the remote object copies. |
| */ |
| err = get_rd_wr_caps(src_file, &src_got, |
| dst_file, (dst_off + len), &dst_got); |
| if (err < 0) { |
| dout("get_rd_wr_caps returned %d\n", err); |
| ret = -EOPNOTSUPP; |
| goto out; |
| } |
| |
| ret = is_file_size_ok(src_inode, dst_inode, src_off, dst_off, len); |
| if (ret < 0) |
| goto out_caps; |
| |
| /* Drop dst file cached pages */ |
| ceph_fscache_invalidate(dst_inode, false); |
| ret = invalidate_inode_pages2_range(dst_inode->i_mapping, |
| dst_off >> PAGE_SHIFT, |
| (dst_off + len) >> PAGE_SHIFT); |
| if (ret < 0) { |
| dout("Failed to invalidate inode pages (%zd)\n", ret); |
| ret = 0; /* XXX */ |
| } |
| ceph_calc_file_object_mapping(&src_ci->i_layout, src_off, |
| src_ci->i_layout.object_size, |
| &src_objnum, &src_objoff, &src_objlen); |
| ceph_calc_file_object_mapping(&dst_ci->i_layout, dst_off, |
| dst_ci->i_layout.object_size, |
| &dst_objnum, &dst_objoff, &dst_objlen); |
| /* object-level offsets need to the same */ |
| if (src_objoff != dst_objoff) { |
| ret = -EOPNOTSUPP; |
| goto out_caps; |
| } |
| |
| /* |
| * Do a manual copy if the object offset isn't object aligned. |
| * 'src_objlen' contains the bytes left until the end of the object, |
| * starting at the src_off |
| */ |
| if (src_objoff) { |
| dout("Initial partial copy of %u bytes\n", src_objlen); |
| |
| /* |
| * we need to temporarily drop all caps as we'll be calling |
| * {read,write}_iter, which will get caps again. |
| */ |
| put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got); |
| ret = do_splice_direct(src_file, &src_off, dst_file, |
| &dst_off, src_objlen, flags); |
| /* Abort on short copies or on error */ |
| if (ret < src_objlen) { |
| dout("Failed partial copy (%zd)\n", ret); |
| goto out; |
| } |
| len -= ret; |
| err = get_rd_wr_caps(src_file, &src_got, |
| dst_file, (dst_off + len), &dst_got); |
| if (err < 0) |
| goto out; |
| err = is_file_size_ok(src_inode, dst_inode, |
| src_off, dst_off, len); |
| if (err < 0) |
| goto out_caps; |
| } |
| |
| size = i_size_read(dst_inode); |
| bytes = ceph_do_objects_copy(src_ci, &src_off, dst_ci, &dst_off, |
| src_fsc, len, flags); |
| if (bytes <= 0) { |
| if (!ret) |
| ret = bytes; |
| goto out_caps; |
| } |
| dout("Copied %zu bytes out of %zu\n", bytes, len); |
| len -= bytes; |
| ret += bytes; |
| |
| file_update_time(dst_file); |
| inode_inc_iversion_raw(dst_inode); |
| |
| if (dst_off > size) { |
| /* Let the MDS know about dst file size change */ |
| if (ceph_inode_set_size(dst_inode, dst_off) || |
| ceph_quota_is_max_bytes_approaching(dst_inode, dst_off)) |
| ceph_check_caps(dst_ci, CHECK_CAPS_AUTHONLY | CHECK_CAPS_FLUSH); |
| } |
| /* Mark Fw dirty */ |
| spin_lock(&dst_ci->i_ceph_lock); |
| dirty = __ceph_mark_dirty_caps(dst_ci, CEPH_CAP_FILE_WR, &prealloc_cf); |
| spin_unlock(&dst_ci->i_ceph_lock); |
| if (dirty) |
| __mark_inode_dirty(dst_inode, dirty); |
| |
| out_caps: |
| put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got); |
| |
| /* |
| * Do the final manual copy if we still have some bytes left, unless |
| * there were errors in remote object copies (len >= object_size). |
| */ |
| if (len && (len < src_ci->i_layout.object_size)) { |
| dout("Final partial copy of %zu bytes\n", len); |
| bytes = do_splice_direct(src_file, &src_off, dst_file, |
| &dst_off, len, flags); |
| if (bytes > 0) |
| ret += bytes; |
| else |
| dout("Failed partial copy (%zd)\n", bytes); |
| } |
| |
| out: |
| ceph_free_cap_flush(prealloc_cf); |
| |
| return ret; |
| } |
| |
| 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) |
| { |
| ssize_t ret; |
| |
| ret = __ceph_copy_file_range(src_file, src_off, dst_file, dst_off, |
| len, flags); |
| |
| if (ret == -EOPNOTSUPP || ret == -EXDEV) |
| ret = generic_copy_file_range(src_file, src_off, dst_file, |
| dst_off, len, flags); |
| return ret; |
| } |
| |
| const struct file_operations ceph_file_fops = { |
| .open = ceph_open, |
| .release = ceph_release, |
| .llseek = ceph_llseek, |
| .read_iter = ceph_read_iter, |
| .write_iter = ceph_write_iter, |
| .mmap = ceph_mmap, |
| .fsync = ceph_fsync, |
| .lock = ceph_lock, |
| .setlease = simple_nosetlease, |
| .flock = ceph_flock, |
| .splice_read = generic_file_splice_read, |
| .splice_write = iter_file_splice_write, |
| .unlocked_ioctl = ceph_ioctl, |
| .compat_ioctl = compat_ptr_ioctl, |
| .fallocate = ceph_fallocate, |
| .copy_file_range = ceph_copy_file_range, |
| }; |