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- // 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_pages(iter, pages, maxsize - size,
- ITER_GET_BVECS_PAGES, &start);
- if (bytes < 0)
- return size ?: bytes;
- iov_iter_advance(iter, bytes);
- size += bytes;
- for ( ; bytes; idx++, bvec_idx++) {
- struct bio_vec bv = {
- .bv_page = pages[idx],
- .bv_len = min_t(int, bytes, PAGE_SIZE - start),
- .bv_offset = start,
- };
- bvecs[bvec_idx] = bv;
- bytes -= bv.bv_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_file_info *fi;
- 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;
- 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);
- return 0;
- }
- /*
- * 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_register_inode_cookie(inode);
- ceph_fscache_file_set_cookie(inode, file);
- 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, NULL);
- 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, NULL);
- 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 ceph_async_create_cb(struct ceph_mds_client *mdsc,
- struct ceph_mds_request *req)
- {
- int result = req->r_err ? req->r_err :
- le32_to_cpu(req->r_reply_info.head->result);
- if (result == -EJUKEBOX)
- goto out;
- mapping_set_error(req->r_parent->i_mapping, result);
- if (result) {
- struct dentry *dentry = req->r_dentry;
- int pathlen = 0;
- u64 base = 0;
- char *path = ceph_mdsc_build_path(req->r_dentry, &pathlen,
- &base, 0);
- ceph_dir_clear_complete(req->r_parent);
- if (!d_unhashed(dentry))
- d_drop(dentry);
- /* FIXME: start returning I/O errors on all accesses? */
- pr_warn("ceph: async create failure path=(%llx)%s result=%d!\n",
- base, IS_ERR(path) ? "<<bad>>" : path, result);
- ceph_mdsc_free_path(path, pathlen);
- }
- if (req->r_target_inode) {
- struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
- u64 ino = ceph_vino(req->r_target_inode).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(req->r_target_inode->i_mapping, result);
- 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);
- }
- ceph_kick_flushing_inode_caps(req->r_session, ci);
- spin_unlock(&ci->i_ceph_lock);
- } else {
- 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 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);
- 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 if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP) &&
- !in_group_p(dir->i_gid) &&
- !capable_wrt_inode_uidgid(dir, CAP_FSETID))
- 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);
- }
- 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;
- 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;
- } 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;
- 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))) {
- 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;
- 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|O_TRUNC)) ? dir : NULL,
- req);
- err = ceph_handle_snapdir(req, dentry, err);
- if (err)
- goto out_req;
- if ((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_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);
- 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;
- u64 i_size;
- 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);
- ret = ceph_osdc_start_request(osdc, req, false);
- if (!ret)
- ret = ceph_osdc_wait_request(osdc, req);
- ceph_update_read_latency(&fsc->mdsc->metric,
- req->r_start_latency,
- req->r_end_latency,
- 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 (ret >= 0 &&
- iov_iter_count(to) > 0 && off >= i_size_read(inode))
- *retry_op = CHECK_EOF;
- 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, NULL);
- }
- spin_lock(&ci->i_ceph_lock);
- ci->i_inline_version = CEPH_INLINE_NONE;
- 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, 0);
- 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;
- 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, osd_data->bvec_pos.iter.bi_size);
- /* r_start_latency == 0 means the request was not submitted */
- if (req->r_start_latency) {
- if (aio_req->write)
- ceph_update_write_latency(metric, req->r_start_latency,
- req->r_end_latency, rc);
- else
- ceph_update_read_latency(metric, req->r_start_latency,
- req->r_end_latency, rc);
- }
- 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 && osd_data->bvec_pos.iter.bi_size > rc) {
- struct iov_iter i;
- int zlen = osd_data->bvec_pos.iter.bi_size - 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, READ, osd_data->bvec_pos.bvecs,
- osd_data->num_bvecs,
- osd_data->bvec_pos.iter.bi_size);
- iov_iter_advance(&i, rc);
- iov_iter_zero(zlen, &i);
- }
- }
- 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;
- ret = ceph_osdc_start_request(req->r_osdc, req, false);
- 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 && iter_is_iovec(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 = 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;
- }
- ret = ceph_osdc_start_request(req->r_osdc, req, false);
- if (!ret)
- ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
- if (write)
- ceph_update_write_latency(metric, req->r_start_latency,
- req->r_end_latency, ret);
- else
- ceph_update_read_latency(metric, req->r_start_latency,
- req->r_end_latency, 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, READ, 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,
- NULL);
- }
- }
- 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)
- ret = ceph_osdc_start_request(req->r_osdc,
- req, false);
- 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;
- 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;
- ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
- if (!ret)
- ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
- ceph_update_write_latency(&fsc->mdsc->metric, req->r_start_latency,
- req->r_end_latency, 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,
- NULL);
- }
- }
- 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);
- struct page *pinned_page = NULL;
- bool direct_lock = iocb->ki_flags & IOCB_DIRECT;
- ssize_t ret;
- int want, 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 (direct_lock)
- ceph_start_io_direct(inode);
- else
- ceph_start_io_read(inode);
- if (fi->fmode & CEPH_FILE_MODE_LAZY)
- want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
- else
- want = CEPH_CAP_FILE_CACHE;
- ret = ceph_get_caps(filp, CEPH_CAP_FILE_RD, want, -1,
- &got, &pinned_page);
- if (ret < 0) {
- if (iocb->ki_flags & IOCB_DIRECT)
- 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 (ci->i_inline_version == CEPH_INLINE_NONE) {
- 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);
- if (pinned_page) {
- put_page(pinned_page);
- pinned_page = NULL;
- }
- 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, 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_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;
- if (ci->i_inline_version != CEPH_INLINE_NONE) {
- err = ceph_uninline_data(file, NULL);
- if (err < 0)
- 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->fmode & CEPH_FILE_MODE_LAZY)
- want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
- else
- want = CEPH_CAP_FILE_BUFFER;
- got = 0;
- err = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, pos + count,
- &got, NULL);
- 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(file, from, pos);
- 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);
- ci->i_inline_version = CEPH_INLINE_NONE;
- 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, 0, NULL);
- }
- 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)
- {
- struct inode *inode = file->f_mapping->host;
- struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
- loff_t i_size;
- loff_t ret;
- inode_lock(inode);
- if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
- ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
- if (ret < 0)
- goto out;
- }
- i_size = i_size_read(inode);
- switch (whence) {
- case SEEK_END:
- offset += i_size;
- break;
- case SEEK_CUR:
- /*
- * Here we special-case the lseek(fd, 0, SEEK_CUR)
- * position-querying operation. Avoid rewriting the "same"
- * f_pos value back to the file because a concurrent read(),
- * write() or lseek() might have altered it
- */
- if (offset == 0) {
- ret = file->f_pos;
- goto out;
- }
- offset += file->f_pos;
- break;
- case SEEK_DATA:
- if (offset < 0 || offset >= i_size) {
- ret = -ENXIO;
- goto out;
- }
- break;
- case SEEK_HOLE:
- if (offset < 0 || offset >= i_size) {
- ret = -ENXIO;
- goto out;
- }
- offset = i_size;
- break;
- }
- ret = vfs_setpos(file, offset, max(i_size, fsc->max_file_size));
- out:
- inode_unlock(inode);
- return ret;
- }
- 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 (!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;
- ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
- if (!ret) {
- 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;
- }
- if (ci->i_inline_version != CEPH_INLINE_NONE) {
- ret = ceph_uninline_data(file, NULL);
- if (ret < 0)
- 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, NULL);
- if (ret < 0)
- goto unlock;
- ceph_zero_pagecache_range(inode, offset, length);
- ret = ceph_zero_objects(inode, offset, length);
- if (!ret) {
- spin_lock(&ci->i_ceph_lock);
- ci->i_inline_version = CEPH_INLINE_NONE;
- 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);
- }
- 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, NULL);
- 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, NULL);
- 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 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;
- 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);
- 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 */
- ret = ceph_osdc_copy_from(&fsc->client->osdc,
- src_ci->i_vino.snap, 0,
- &src_oid, &src_oloc,
- CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
- CEPH_OSD_OP_FLAG_FADVISE_NOCACHE,
- &dst_oid, &dst_oloc,
- CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
- CEPH_OSD_OP_FLAG_FADVISE_DONTNEED,
- dst_ci->i_truncate_seq,
- dst_ci->i_truncate_size,
- CEPH_OSD_COPY_FROM_FLAG_TRUNCATE_SEQ);
- 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 */
- 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, NULL);
- }
- /* Mark Fw dirty */
- spin_lock(&dst_ci->i_ceph_lock);
- dst_ci->i_inline_version = CEPH_INLINE_NONE;
- 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,
- };
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