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- // SPDX-License-Identifier: GPL-2.0
- #include <linux/ceph/ceph_debug.h>
- #include <linux/spinlock.h>
- #include <linux/namei.h>
- #include <linux/slab.h>
- #include <linux/sched.h>
- #include <linux/xattr.h>
- #include "super.h"
- #include "mds_client.h"
- /*
- * Directory operations: readdir, lookup, create, link, unlink,
- * rename, etc.
- */
- /*
- * Ceph MDS operations are specified in terms of a base ino and
- * relative path. Thus, the client can specify an operation on a
- * specific inode (e.g., a getattr due to fstat(2)), or as a path
- * relative to, say, the root directory.
- *
- * Normally, we limit ourselves to strict inode ops (no path component)
- * or dentry operations (a single path component relative to an ino). The
- * exception to this is open_root_dentry(), which will open the mount
- * point by name.
- */
- const struct dentry_operations ceph_dentry_ops;
- static bool __dentry_lease_is_valid(struct ceph_dentry_info *di);
- static int __dir_lease_try_check(const struct dentry *dentry);
- /*
- * Initialize ceph dentry state.
- */
- static int ceph_d_init(struct dentry *dentry)
- {
- struct ceph_dentry_info *di;
- struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dentry->d_sb);
- di = kmem_cache_zalloc(ceph_dentry_cachep, GFP_KERNEL);
- if (!di)
- return -ENOMEM; /* oh well */
- di->dentry = dentry;
- di->lease_session = NULL;
- di->time = jiffies;
- dentry->d_fsdata = di;
- INIT_LIST_HEAD(&di->lease_list);
- atomic64_inc(&mdsc->metric.total_dentries);
- return 0;
- }
- /*
- * for f_pos for readdir:
- * - hash order:
- * (0xff << 52) | ((24 bits hash) << 28) |
- * (the nth entry has hash collision);
- * - frag+name order;
- * ((frag value) << 28) | (the nth entry in frag);
- */
- #define OFFSET_BITS 28
- #define OFFSET_MASK ((1 << OFFSET_BITS) - 1)
- #define HASH_ORDER (0xffull << (OFFSET_BITS + 24))
- loff_t ceph_make_fpos(unsigned high, unsigned off, bool hash_order)
- {
- loff_t fpos = ((loff_t)high << 28) | (loff_t)off;
- if (hash_order)
- fpos |= HASH_ORDER;
- return fpos;
- }
- static bool is_hash_order(loff_t p)
- {
- return (p & HASH_ORDER) == HASH_ORDER;
- }
- static unsigned fpos_frag(loff_t p)
- {
- return p >> OFFSET_BITS;
- }
- static unsigned fpos_hash(loff_t p)
- {
- return ceph_frag_value(fpos_frag(p));
- }
- static unsigned fpos_off(loff_t p)
- {
- return p & OFFSET_MASK;
- }
- static int fpos_cmp(loff_t l, loff_t r)
- {
- int v = ceph_frag_compare(fpos_frag(l), fpos_frag(r));
- if (v)
- return v;
- return (int)(fpos_off(l) - fpos_off(r));
- }
- /*
- * make note of the last dentry we read, so we can
- * continue at the same lexicographical point,
- * regardless of what dir changes take place on the
- * server.
- */
- static int note_last_dentry(struct ceph_dir_file_info *dfi, const char *name,
- int len, unsigned next_offset)
- {
- char *buf = kmalloc(len+1, GFP_KERNEL);
- if (!buf)
- return -ENOMEM;
- kfree(dfi->last_name);
- dfi->last_name = buf;
- memcpy(dfi->last_name, name, len);
- dfi->last_name[len] = 0;
- dfi->next_offset = next_offset;
- dout("note_last_dentry '%s'\n", dfi->last_name);
- return 0;
- }
- static struct dentry *
- __dcache_find_get_entry(struct dentry *parent, u64 idx,
- struct ceph_readdir_cache_control *cache_ctl)
- {
- struct inode *dir = d_inode(parent);
- struct dentry *dentry;
- unsigned idx_mask = (PAGE_SIZE / sizeof(struct dentry *)) - 1;
- loff_t ptr_pos = idx * sizeof(struct dentry *);
- pgoff_t ptr_pgoff = ptr_pos >> PAGE_SHIFT;
- if (ptr_pos >= i_size_read(dir))
- return NULL;
- if (!cache_ctl->page || ptr_pgoff != page_index(cache_ctl->page)) {
- ceph_readdir_cache_release(cache_ctl);
- cache_ctl->page = find_lock_page(&dir->i_data, ptr_pgoff);
- if (!cache_ctl->page) {
- dout(" page %lu not found\n", ptr_pgoff);
- return ERR_PTR(-EAGAIN);
- }
- /* reading/filling the cache are serialized by
- i_rwsem, no need to use page lock */
- unlock_page(cache_ctl->page);
- cache_ctl->dentries = kmap(cache_ctl->page);
- }
- cache_ctl->index = idx & idx_mask;
- rcu_read_lock();
- spin_lock(&parent->d_lock);
- /* check i_size again here, because empty directory can be
- * marked as complete while not holding the i_rwsem. */
- if (ceph_dir_is_complete_ordered(dir) && ptr_pos < i_size_read(dir))
- dentry = cache_ctl->dentries[cache_ctl->index];
- else
- dentry = NULL;
- spin_unlock(&parent->d_lock);
- if (dentry && !lockref_get_not_dead(&dentry->d_lockref))
- dentry = NULL;
- rcu_read_unlock();
- return dentry ? : ERR_PTR(-EAGAIN);
- }
- /*
- * When possible, we try to satisfy a readdir by peeking at the
- * dcache. We make this work by carefully ordering dentries on
- * d_child when we initially get results back from the MDS, and
- * falling back to a "normal" sync readdir if any dentries in the dir
- * are dropped.
- *
- * Complete dir indicates that we have all dentries in the dir. It is
- * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by
- * the MDS if/when the directory is modified).
- */
- static int __dcache_readdir(struct file *file, struct dir_context *ctx,
- int shared_gen)
- {
- struct ceph_dir_file_info *dfi = file->private_data;
- struct dentry *parent = file->f_path.dentry;
- struct inode *dir = d_inode(parent);
- struct dentry *dentry, *last = NULL;
- struct ceph_dentry_info *di;
- struct ceph_readdir_cache_control cache_ctl = {};
- u64 idx = 0;
- int err = 0;
- dout("__dcache_readdir %p v%u at %llx\n", dir, (unsigned)shared_gen, ctx->pos);
- /* search start position */
- if (ctx->pos > 2) {
- u64 count = div_u64(i_size_read(dir), sizeof(struct dentry *));
- while (count > 0) {
- u64 step = count >> 1;
- dentry = __dcache_find_get_entry(parent, idx + step,
- &cache_ctl);
- if (!dentry) {
- /* use linar search */
- idx = 0;
- break;
- }
- if (IS_ERR(dentry)) {
- err = PTR_ERR(dentry);
- goto out;
- }
- di = ceph_dentry(dentry);
- spin_lock(&dentry->d_lock);
- if (fpos_cmp(di->offset, ctx->pos) < 0) {
- idx += step + 1;
- count -= step + 1;
- } else {
- count = step;
- }
- spin_unlock(&dentry->d_lock);
- dput(dentry);
- }
- dout("__dcache_readdir %p cache idx %llu\n", dir, idx);
- }
- for (;;) {
- bool emit_dentry = false;
- dentry = __dcache_find_get_entry(parent, idx++, &cache_ctl);
- if (!dentry) {
- dfi->file_info.flags |= CEPH_F_ATEND;
- err = 0;
- break;
- }
- if (IS_ERR(dentry)) {
- err = PTR_ERR(dentry);
- goto out;
- }
- spin_lock(&dentry->d_lock);
- di = ceph_dentry(dentry);
- if (d_unhashed(dentry) ||
- d_really_is_negative(dentry) ||
- di->lease_shared_gen != shared_gen) {
- spin_unlock(&dentry->d_lock);
- dput(dentry);
- err = -EAGAIN;
- goto out;
- }
- if (fpos_cmp(ctx->pos, di->offset) <= 0) {
- __ceph_dentry_dir_lease_touch(di);
- emit_dentry = true;
- }
- spin_unlock(&dentry->d_lock);
- if (emit_dentry) {
- dout(" %llx dentry %p %pd %p\n", di->offset,
- dentry, dentry, d_inode(dentry));
- ctx->pos = di->offset;
- if (!dir_emit(ctx, dentry->d_name.name,
- dentry->d_name.len, ceph_present_inode(d_inode(dentry)),
- d_inode(dentry)->i_mode >> 12)) {
- dput(dentry);
- err = 0;
- break;
- }
- ctx->pos++;
- if (last)
- dput(last);
- last = dentry;
- } else {
- dput(dentry);
- }
- }
- out:
- ceph_readdir_cache_release(&cache_ctl);
- if (last) {
- int ret;
- di = ceph_dentry(last);
- ret = note_last_dentry(dfi, last->d_name.name, last->d_name.len,
- fpos_off(di->offset) + 1);
- if (ret < 0)
- err = ret;
- dput(last);
- /* last_name no longer match cache index */
- if (dfi->readdir_cache_idx >= 0) {
- dfi->readdir_cache_idx = -1;
- dfi->dir_release_count = 0;
- }
- }
- return err;
- }
- static bool need_send_readdir(struct ceph_dir_file_info *dfi, loff_t pos)
- {
- if (!dfi->last_readdir)
- return true;
- if (is_hash_order(pos))
- return !ceph_frag_contains_value(dfi->frag, fpos_hash(pos));
- else
- return dfi->frag != fpos_frag(pos);
- }
- static int ceph_readdir(struct file *file, struct dir_context *ctx)
- {
- struct ceph_dir_file_info *dfi = 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_mds_client *mdsc = fsc->mdsc;
- int i;
- int err;
- unsigned frag = -1;
- struct ceph_mds_reply_info_parsed *rinfo;
- dout("readdir %p file %p pos %llx\n", inode, file, ctx->pos);
- if (dfi->file_info.flags & CEPH_F_ATEND)
- return 0;
- /* always start with . and .. */
- if (ctx->pos == 0) {
- dout("readdir off 0 -> '.'\n");
- if (!dir_emit(ctx, ".", 1, ceph_present_inode(inode),
- inode->i_mode >> 12))
- return 0;
- ctx->pos = 1;
- }
- if (ctx->pos == 1) {
- u64 ino;
- struct dentry *dentry = file->f_path.dentry;
- spin_lock(&dentry->d_lock);
- ino = ceph_present_inode(dentry->d_parent->d_inode);
- spin_unlock(&dentry->d_lock);
- dout("readdir off 1 -> '..'\n");
- if (!dir_emit(ctx, "..", 2, ino, inode->i_mode >> 12))
- return 0;
- ctx->pos = 2;
- }
- spin_lock(&ci->i_ceph_lock);
- /* request Fx cap. if have Fx, we don't need to release Fs cap
- * for later create/unlink. */
- __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_WR);
- /* can we use the dcache? */
- if (ceph_test_mount_opt(fsc, DCACHE) &&
- !ceph_test_mount_opt(fsc, NOASYNCREADDIR) &&
- ceph_snap(inode) != CEPH_SNAPDIR &&
- __ceph_dir_is_complete_ordered(ci) &&
- __ceph_caps_issued_mask_metric(ci, CEPH_CAP_FILE_SHARED, 1)) {
- int shared_gen = atomic_read(&ci->i_shared_gen);
- spin_unlock(&ci->i_ceph_lock);
- err = __dcache_readdir(file, ctx, shared_gen);
- if (err != -EAGAIN)
- return err;
- } else {
- spin_unlock(&ci->i_ceph_lock);
- }
- /* proceed with a normal readdir */
- more:
- /* do we have the correct frag content buffered? */
- if (need_send_readdir(dfi, ctx->pos)) {
- struct ceph_mds_request *req;
- int op = ceph_snap(inode) == CEPH_SNAPDIR ?
- CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR;
- /* discard old result, if any */
- if (dfi->last_readdir) {
- ceph_mdsc_put_request(dfi->last_readdir);
- dfi->last_readdir = NULL;
- }
- if (is_hash_order(ctx->pos)) {
- /* fragtree isn't always accurate. choose frag
- * based on previous reply when possible. */
- if (frag == (unsigned)-1)
- frag = ceph_choose_frag(ci, fpos_hash(ctx->pos),
- NULL, NULL);
- } else {
- frag = fpos_frag(ctx->pos);
- }
- dout("readdir fetching %llx.%llx frag %x offset '%s'\n",
- ceph_vinop(inode), frag, dfi->last_name);
- req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
- if (IS_ERR(req))
- return PTR_ERR(req);
- err = ceph_alloc_readdir_reply_buffer(req, inode);
- if (err) {
- ceph_mdsc_put_request(req);
- return err;
- }
- /* hints to request -> mds selection code */
- req->r_direct_mode = USE_AUTH_MDS;
- if (op == CEPH_MDS_OP_READDIR) {
- req->r_direct_hash = ceph_frag_value(frag);
- __set_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags);
- req->r_inode_drop = CEPH_CAP_FILE_EXCL;
- }
- if (dfi->last_name) {
- req->r_path2 = kstrdup(dfi->last_name, GFP_KERNEL);
- if (!req->r_path2) {
- ceph_mdsc_put_request(req);
- return -ENOMEM;
- }
- } else if (is_hash_order(ctx->pos)) {
- req->r_args.readdir.offset_hash =
- cpu_to_le32(fpos_hash(ctx->pos));
- }
- req->r_dir_release_cnt = dfi->dir_release_count;
- req->r_dir_ordered_cnt = dfi->dir_ordered_count;
- req->r_readdir_cache_idx = dfi->readdir_cache_idx;
- req->r_readdir_offset = dfi->next_offset;
- req->r_args.readdir.frag = cpu_to_le32(frag);
- req->r_args.readdir.flags =
- cpu_to_le16(CEPH_READDIR_REPLY_BITFLAGS);
- req->r_inode = inode;
- ihold(inode);
- req->r_dentry = dget(file->f_path.dentry);
- err = ceph_mdsc_do_request(mdsc, NULL, req);
- if (err < 0) {
- ceph_mdsc_put_request(req);
- return err;
- }
- dout("readdir got and parsed readdir result=%d on "
- "frag %x, end=%d, complete=%d, hash_order=%d\n",
- err, frag,
- (int)req->r_reply_info.dir_end,
- (int)req->r_reply_info.dir_complete,
- (int)req->r_reply_info.hash_order);
- rinfo = &req->r_reply_info;
- if (le32_to_cpu(rinfo->dir_dir->frag) != frag) {
- frag = le32_to_cpu(rinfo->dir_dir->frag);
- if (!rinfo->hash_order) {
- dfi->next_offset = req->r_readdir_offset;
- /* adjust ctx->pos to beginning of frag */
- ctx->pos = ceph_make_fpos(frag,
- dfi->next_offset,
- false);
- }
- }
- dfi->frag = frag;
- dfi->last_readdir = req;
- if (test_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags)) {
- dfi->readdir_cache_idx = req->r_readdir_cache_idx;
- if (dfi->readdir_cache_idx < 0) {
- /* preclude from marking dir ordered */
- dfi->dir_ordered_count = 0;
- } else if (ceph_frag_is_leftmost(frag) &&
- dfi->next_offset == 2) {
- /* note dir version at start of readdir so
- * we can tell if any dentries get dropped */
- dfi->dir_release_count = req->r_dir_release_cnt;
- dfi->dir_ordered_count = req->r_dir_ordered_cnt;
- }
- } else {
- dout("readdir !did_prepopulate\n");
- /* disable readdir cache */
- dfi->readdir_cache_idx = -1;
- /* preclude from marking dir complete */
- dfi->dir_release_count = 0;
- }
- /* note next offset and last dentry name */
- if (rinfo->dir_nr > 0) {
- struct ceph_mds_reply_dir_entry *rde =
- rinfo->dir_entries + (rinfo->dir_nr-1);
- unsigned next_offset = req->r_reply_info.dir_end ?
- 2 : (fpos_off(rde->offset) + 1);
- err = note_last_dentry(dfi, rde->name, rde->name_len,
- next_offset);
- if (err) {
- ceph_mdsc_put_request(dfi->last_readdir);
- dfi->last_readdir = NULL;
- return err;
- }
- } else if (req->r_reply_info.dir_end) {
- dfi->next_offset = 2;
- /* keep last name */
- }
- }
- rinfo = &dfi->last_readdir->r_reply_info;
- dout("readdir frag %x num %d pos %llx chunk first %llx\n",
- dfi->frag, rinfo->dir_nr, ctx->pos,
- rinfo->dir_nr ? rinfo->dir_entries[0].offset : 0LL);
- i = 0;
- /* search start position */
- if (rinfo->dir_nr > 0) {
- int step, nr = rinfo->dir_nr;
- while (nr > 0) {
- step = nr >> 1;
- if (rinfo->dir_entries[i + step].offset < ctx->pos) {
- i += step + 1;
- nr -= step + 1;
- } else {
- nr = step;
- }
- }
- }
- for (; i < rinfo->dir_nr; i++) {
- struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
- BUG_ON(rde->offset < ctx->pos);
- ctx->pos = rde->offset;
- dout("readdir (%d/%d) -> %llx '%.*s' %p\n",
- i, rinfo->dir_nr, ctx->pos,
- rde->name_len, rde->name, &rde->inode.in);
- BUG_ON(!rde->inode.in);
- if (!dir_emit(ctx, rde->name, rde->name_len,
- ceph_present_ino(inode->i_sb, le64_to_cpu(rde->inode.in->ino)),
- le32_to_cpu(rde->inode.in->mode) >> 12)) {
- /*
- * NOTE: Here no need to put the 'dfi->last_readdir',
- * because when dir_emit stops us it's most likely
- * doesn't have enough memory, etc. So for next readdir
- * it will continue.
- */
- dout("filldir stopping us...\n");
- return 0;
- }
- ctx->pos++;
- }
- ceph_mdsc_put_request(dfi->last_readdir);
- dfi->last_readdir = NULL;
- if (dfi->next_offset > 2) {
- frag = dfi->frag;
- goto more;
- }
- /* more frags? */
- if (!ceph_frag_is_rightmost(dfi->frag)) {
- frag = ceph_frag_next(dfi->frag);
- if (is_hash_order(ctx->pos)) {
- loff_t new_pos = ceph_make_fpos(ceph_frag_value(frag),
- dfi->next_offset, true);
- if (new_pos > ctx->pos)
- ctx->pos = new_pos;
- /* keep last_name */
- } else {
- ctx->pos = ceph_make_fpos(frag, dfi->next_offset,
- false);
- kfree(dfi->last_name);
- dfi->last_name = NULL;
- }
- dout("readdir next frag is %x\n", frag);
- goto more;
- }
- dfi->file_info.flags |= CEPH_F_ATEND;
- /*
- * if dir_release_count still matches the dir, no dentries
- * were released during the whole readdir, and we should have
- * the complete dir contents in our cache.
- */
- if (atomic64_read(&ci->i_release_count) ==
- dfi->dir_release_count) {
- spin_lock(&ci->i_ceph_lock);
- if (dfi->dir_ordered_count ==
- atomic64_read(&ci->i_ordered_count)) {
- dout(" marking %p complete and ordered\n", inode);
- /* use i_size to track number of entries in
- * readdir cache */
- BUG_ON(dfi->readdir_cache_idx < 0);
- i_size_write(inode, dfi->readdir_cache_idx *
- sizeof(struct dentry*));
- } else {
- dout(" marking %p complete\n", inode);
- }
- __ceph_dir_set_complete(ci, dfi->dir_release_count,
- dfi->dir_ordered_count);
- spin_unlock(&ci->i_ceph_lock);
- }
- dout("readdir %p file %p done.\n", inode, file);
- return 0;
- }
- static void reset_readdir(struct ceph_dir_file_info *dfi)
- {
- if (dfi->last_readdir) {
- ceph_mdsc_put_request(dfi->last_readdir);
- dfi->last_readdir = NULL;
- }
- kfree(dfi->last_name);
- dfi->last_name = NULL;
- dfi->dir_release_count = 0;
- dfi->readdir_cache_idx = -1;
- dfi->next_offset = 2; /* compensate for . and .. */
- dfi->file_info.flags &= ~CEPH_F_ATEND;
- }
- /*
- * discard buffered readdir content on seekdir(0), or seek to new frag,
- * or seek prior to current chunk
- */
- static bool need_reset_readdir(struct ceph_dir_file_info *dfi, loff_t new_pos)
- {
- struct ceph_mds_reply_info_parsed *rinfo;
- loff_t chunk_offset;
- if (new_pos == 0)
- return true;
- if (is_hash_order(new_pos)) {
- /* no need to reset last_name for a forward seek when
- * dentries are sotred in hash order */
- } else if (dfi->frag != fpos_frag(new_pos)) {
- return true;
- }
- rinfo = dfi->last_readdir ? &dfi->last_readdir->r_reply_info : NULL;
- if (!rinfo || !rinfo->dir_nr)
- return true;
- chunk_offset = rinfo->dir_entries[0].offset;
- return new_pos < chunk_offset ||
- is_hash_order(new_pos) != is_hash_order(chunk_offset);
- }
- static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence)
- {
- struct ceph_dir_file_info *dfi = file->private_data;
- struct inode *inode = file->f_mapping->host;
- loff_t retval;
- inode_lock(inode);
- retval = -EINVAL;
- switch (whence) {
- case SEEK_CUR:
- offset += file->f_pos;
- break;
- case SEEK_SET:
- break;
- case SEEK_END:
- retval = -EOPNOTSUPP;
- goto out;
- default:
- goto out;
- }
- if (offset >= 0) {
- if (need_reset_readdir(dfi, offset)) {
- dout("dir_llseek dropping %p content\n", file);
- reset_readdir(dfi);
- } else if (is_hash_order(offset) && offset > file->f_pos) {
- /* for hash offset, we don't know if a forward seek
- * is within same frag */
- dfi->dir_release_count = 0;
- dfi->readdir_cache_idx = -1;
- }
- if (offset != file->f_pos) {
- file->f_pos = offset;
- file->f_version = 0;
- dfi->file_info.flags &= ~CEPH_F_ATEND;
- }
- retval = offset;
- }
- out:
- inode_unlock(inode);
- return retval;
- }
- /*
- * Handle lookups for the hidden .snap directory.
- */
- struct dentry *ceph_handle_snapdir(struct ceph_mds_request *req,
- struct dentry *dentry)
- {
- struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
- struct inode *parent = d_inode(dentry->d_parent); /* we hold i_rwsem */
- /* .snap dir? */
- if (ceph_snap(parent) == CEPH_NOSNAP &&
- strcmp(dentry->d_name.name, fsc->mount_options->snapdir_name) == 0) {
- struct dentry *res;
- struct inode *inode = ceph_get_snapdir(parent);
- res = d_splice_alias(inode, dentry);
- dout("ENOENT on snapdir %p '%pd', linking to snapdir %p. Spliced dentry %p\n",
- dentry, dentry, inode, res);
- if (res)
- dentry = res;
- }
- return dentry;
- }
- /*
- * Figure out final result of a lookup/open request.
- *
- * Mainly, make sure we return the final req->r_dentry (if it already
- * existed) in place of the original VFS-provided dentry when they
- * differ.
- *
- * Gracefully handle the case where the MDS replies with -ENOENT and
- * no trace (which it may do, at its discretion, e.g., if it doesn't
- * care to issue a lease on the negative dentry).
- */
- struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
- struct dentry *dentry, int err)
- {
- if (err == -ENOENT) {
- /* no trace? */
- err = 0;
- if (!req->r_reply_info.head->is_dentry) {
- dout("ENOENT and no trace, dentry %p inode %p\n",
- dentry, d_inode(dentry));
- if (d_really_is_positive(dentry)) {
- d_drop(dentry);
- err = -ENOENT;
- } else {
- d_add(dentry, NULL);
- }
- }
- }
- if (err)
- dentry = ERR_PTR(err);
- else if (dentry != req->r_dentry)
- dentry = dget(req->r_dentry); /* we got spliced */
- else
- dentry = NULL;
- return dentry;
- }
- static bool is_root_ceph_dentry(struct inode *inode, struct dentry *dentry)
- {
- return ceph_ino(inode) == CEPH_INO_ROOT &&
- strncmp(dentry->d_name.name, ".ceph", 5) == 0;
- }
- /*
- * Look up a single dir entry. If there is a lookup intent, inform
- * the MDS so that it gets our 'caps wanted' value in a single op.
- */
- static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
- unsigned int flags)
- {
- struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
- struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
- struct ceph_mds_request *req;
- int op;
- int mask;
- int err;
- dout("lookup %p dentry %p '%pd'\n",
- dir, dentry, dentry);
- if (dentry->d_name.len > NAME_MAX)
- return ERR_PTR(-ENAMETOOLONG);
- /* can we conclude ENOENT locally? */
- if (d_really_is_negative(dentry)) {
- struct ceph_inode_info *ci = ceph_inode(dir);
- struct ceph_dentry_info *di = ceph_dentry(dentry);
- spin_lock(&ci->i_ceph_lock);
- dout(" dir %p flags are 0x%lx\n", dir, ci->i_ceph_flags);
- if (strncmp(dentry->d_name.name,
- fsc->mount_options->snapdir_name,
- dentry->d_name.len) &&
- !is_root_ceph_dentry(dir, dentry) &&
- ceph_test_mount_opt(fsc, DCACHE) &&
- __ceph_dir_is_complete(ci) &&
- __ceph_caps_issued_mask_metric(ci, CEPH_CAP_FILE_SHARED, 1)) {
- __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_RD);
- spin_unlock(&ci->i_ceph_lock);
- dout(" dir %p complete, -ENOENT\n", dir);
- d_add(dentry, NULL);
- di->lease_shared_gen = atomic_read(&ci->i_shared_gen);
- return NULL;
- }
- spin_unlock(&ci->i_ceph_lock);
- }
- op = ceph_snap(dir) == CEPH_SNAPDIR ?
- CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
- req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
- if (IS_ERR(req))
- return ERR_CAST(req);
- 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.getattr.mask = cpu_to_le32(mask);
- ihold(dir);
- req->r_parent = dir;
- set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
- err = ceph_mdsc_do_request(mdsc, NULL, req);
- if (err == -ENOENT) {
- struct dentry *res;
- res = ceph_handle_snapdir(req, dentry);
- if (IS_ERR(res)) {
- err = PTR_ERR(res);
- } else {
- dentry = res;
- err = 0;
- }
- }
- dentry = ceph_finish_lookup(req, dentry, err);
- ceph_mdsc_put_request(req); /* will dput(dentry) */
- dout("lookup result=%p\n", dentry);
- return dentry;
- }
- /*
- * If we do a create but get no trace back from the MDS, follow up with
- * a lookup (the VFS expects us to link up the provided dentry).
- */
- int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry)
- {
- struct dentry *result = ceph_lookup(dir, dentry, 0);
- if (result && !IS_ERR(result)) {
- /*
- * We created the item, then did a lookup, and found
- * it was already linked to another inode we already
- * had in our cache (and thus got spliced). To not
- * confuse VFS (especially when inode is a directory),
- * we don't link our dentry to that inode, return an
- * error instead.
- *
- * This event should be rare and it happens only when
- * we talk to old MDS. Recent MDS does not send traceless
- * reply for request that creates new inode.
- */
- d_drop(result);
- return -ESTALE;
- }
- return PTR_ERR(result);
- }
- static int ceph_mknod(struct user_namespace *mnt_userns, struct inode *dir,
- struct dentry *dentry, umode_t mode, dev_t rdev)
- {
- struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
- struct ceph_mds_request *req;
- struct ceph_acl_sec_ctx as_ctx = {};
- int err;
- if (ceph_snap(dir) != CEPH_NOSNAP)
- return -EROFS;
- err = ceph_wait_on_conflict_unlink(dentry);
- if (err)
- return err;
- if (ceph_quota_is_max_files_exceeded(dir)) {
- err = -EDQUOT;
- goto out;
- }
- err = ceph_pre_init_acls(dir, &mode, &as_ctx);
- if (err < 0)
- goto out;
- err = ceph_security_init_secctx(dentry, mode, &as_ctx);
- if (err < 0)
- goto out;
- dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n",
- dir, dentry, mode, rdev);
- req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS);
- if (IS_ERR(req)) {
- err = PTR_ERR(req);
- goto out;
- }
- req->r_dentry = dget(dentry);
- req->r_num_caps = 2;
- req->r_parent = dir;
- ihold(dir);
- set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
- req->r_args.mknod.mode = cpu_to_le32(mode);
- req->r_args.mknod.rdev = cpu_to_le32(rdev);
- 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;
- }
- err = ceph_mdsc_do_request(mdsc, dir, req);
- if (!err && !req->r_reply_info.head->is_dentry)
- err = ceph_handle_notrace_create(dir, dentry);
- ceph_mdsc_put_request(req);
- out:
- if (!err)
- ceph_init_inode_acls(d_inode(dentry), &as_ctx);
- else
- d_drop(dentry);
- ceph_release_acl_sec_ctx(&as_ctx);
- return err;
- }
- static int ceph_create(struct user_namespace *mnt_userns, struct inode *dir,
- struct dentry *dentry, umode_t mode, bool excl)
- {
- return ceph_mknod(mnt_userns, dir, dentry, mode, 0);
- }
- static int ceph_symlink(struct user_namespace *mnt_userns, struct inode *dir,
- struct dentry *dentry, const char *dest)
- {
- struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
- struct ceph_mds_request *req;
- struct ceph_acl_sec_ctx as_ctx = {};
- int err;
- if (ceph_snap(dir) != CEPH_NOSNAP)
- return -EROFS;
- err = ceph_wait_on_conflict_unlink(dentry);
- if (err)
- return err;
- if (ceph_quota_is_max_files_exceeded(dir)) {
- err = -EDQUOT;
- goto out;
- }
- err = ceph_security_init_secctx(dentry, S_IFLNK | 0777, &as_ctx);
- if (err < 0)
- goto out;
- dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest);
- req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS);
- if (IS_ERR(req)) {
- err = PTR_ERR(req);
- goto out;
- }
- req->r_path2 = kstrdup(dest, GFP_KERNEL);
- if (!req->r_path2) {
- err = -ENOMEM;
- ceph_mdsc_put_request(req);
- goto out;
- }
- req->r_parent = dir;
- ihold(dir);
- set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
- req->r_dentry = dget(dentry);
- req->r_num_caps = 2;
- 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;
- }
- err = ceph_mdsc_do_request(mdsc, dir, req);
- if (!err && !req->r_reply_info.head->is_dentry)
- err = ceph_handle_notrace_create(dir, dentry);
- ceph_mdsc_put_request(req);
- out:
- if (err)
- d_drop(dentry);
- ceph_release_acl_sec_ctx(&as_ctx);
- return err;
- }
- static int ceph_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
- struct dentry *dentry, umode_t mode)
- {
- struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
- struct ceph_mds_request *req;
- struct ceph_acl_sec_ctx as_ctx = {};
- int err;
- int op;
- err = ceph_wait_on_conflict_unlink(dentry);
- if (err)
- return err;
- if (ceph_snap(dir) == CEPH_SNAPDIR) {
- /* mkdir .snap/foo is a MKSNAP */
- op = CEPH_MDS_OP_MKSNAP;
- dout("mksnap dir %p snap '%pd' dn %p\n", dir,
- dentry, dentry);
- } else if (ceph_snap(dir) == CEPH_NOSNAP) {
- dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode);
- op = CEPH_MDS_OP_MKDIR;
- } else {
- err = -EROFS;
- goto out;
- }
- if (op == CEPH_MDS_OP_MKDIR &&
- ceph_quota_is_max_files_exceeded(dir)) {
- err = -EDQUOT;
- goto out;
- }
- mode |= S_IFDIR;
- err = ceph_pre_init_acls(dir, &mode, &as_ctx);
- if (err < 0)
- goto out;
- err = ceph_security_init_secctx(dentry, mode, &as_ctx);
- if (err < 0)
- goto out;
- req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
- if (IS_ERR(req)) {
- err = PTR_ERR(req);
- goto out;
- }
- req->r_dentry = dget(dentry);
- req->r_num_caps = 2;
- req->r_parent = dir;
- ihold(dir);
- set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
- req->r_args.mkdir.mode = cpu_to_le32(mode);
- 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;
- }
- err = ceph_mdsc_do_request(mdsc, dir, req);
- if (!err &&
- !req->r_reply_info.head->is_target &&
- !req->r_reply_info.head->is_dentry)
- err = ceph_handle_notrace_create(dir, dentry);
- ceph_mdsc_put_request(req);
- out:
- if (!err)
- ceph_init_inode_acls(d_inode(dentry), &as_ctx);
- else
- d_drop(dentry);
- ceph_release_acl_sec_ctx(&as_ctx);
- return err;
- }
- static int ceph_link(struct dentry *old_dentry, struct inode *dir,
- struct dentry *dentry)
- {
- struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
- struct ceph_mds_request *req;
- int err;
- err = ceph_wait_on_conflict_unlink(dentry);
- if (err)
- return err;
- if (ceph_snap(dir) != CEPH_NOSNAP)
- return -EROFS;
- dout("link in dir %p old_dentry %p dentry %p\n", dir,
- old_dentry, dentry);
- req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS);
- if (IS_ERR(req)) {
- d_drop(dentry);
- return PTR_ERR(req);
- }
- req->r_dentry = dget(dentry);
- req->r_num_caps = 2;
- req->r_old_dentry = dget(old_dentry);
- req->r_parent = dir;
- ihold(dir);
- set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
- req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
- req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
- /* release LINK_SHARED on source inode (mds will lock it) */
- req->r_old_inode_drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
- err = ceph_mdsc_do_request(mdsc, dir, req);
- if (err) {
- d_drop(dentry);
- } else if (!req->r_reply_info.head->is_dentry) {
- ihold(d_inode(old_dentry));
- d_instantiate(dentry, d_inode(old_dentry));
- }
- ceph_mdsc_put_request(req);
- return err;
- }
- static void ceph_async_unlink_cb(struct ceph_mds_client *mdsc,
- struct ceph_mds_request *req)
- {
- struct dentry *dentry = req->r_dentry;
- struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
- struct ceph_dentry_info *di = ceph_dentry(dentry);
- int result = req->r_err ? req->r_err :
- le32_to_cpu(req->r_reply_info.head->result);
- if (!test_bit(CEPH_DENTRY_ASYNC_UNLINK_BIT, &di->flags))
- pr_warn("%s dentry %p:%pd async unlink bit is not set\n",
- __func__, dentry, dentry);
- spin_lock(&fsc->async_unlink_conflict_lock);
- hash_del_rcu(&di->hnode);
- spin_unlock(&fsc->async_unlink_conflict_lock);
- spin_lock(&dentry->d_lock);
- di->flags &= ~CEPH_DENTRY_ASYNC_UNLINK;
- wake_up_bit(&di->flags, CEPH_DENTRY_ASYNC_UNLINK_BIT);
- spin_unlock(&dentry->d_lock);
- synchronize_rcu();
- if (result == -EJUKEBOX)
- goto out;
- /* If op failed, mark everyone involved for errors */
- if (result) {
- int pathlen = 0;
- u64 base = 0;
- char *path = ceph_mdsc_build_path(dentry, &pathlen,
- &base, 0);
- /* mark error on parent + clear complete */
- mapping_set_error(req->r_parent->i_mapping, result);
- ceph_dir_clear_complete(req->r_parent);
- /* drop the dentry -- we don't know its status */
- if (!d_unhashed(dentry))
- d_drop(dentry);
- /* mark inode itself for an error (since metadata is bogus) */
- mapping_set_error(req->r_old_inode->i_mapping, result);
- pr_warn("async unlink failure path=(%llx)%s result=%d!\n",
- base, IS_ERR(path) ? "<<bad>>" : path, result);
- ceph_mdsc_free_path(path, pathlen);
- }
- out:
- iput(req->r_old_inode);
- ceph_mdsc_release_dir_caps(req);
- }
- static int get_caps_for_async_unlink(struct inode *dir, struct dentry *dentry)
- {
- struct ceph_inode_info *ci = ceph_inode(dir);
- struct ceph_dentry_info *di;
- int got = 0, want = CEPH_CAP_FILE_EXCL | CEPH_CAP_DIR_UNLINK;
- spin_lock(&ci->i_ceph_lock);
- if ((__ceph_caps_issued(ci, NULL) & want) == want) {
- ceph_take_cap_refs(ci, want, false);
- got = want;
- }
- spin_unlock(&ci->i_ceph_lock);
- /* If we didn't get anything, return 0 */
- if (!got)
- return 0;
- spin_lock(&dentry->d_lock);
- di = ceph_dentry(dentry);
- /*
- * - We are holding Fx, which implies Fs caps.
- * - Only support async unlink for primary linkage
- */
- if (atomic_read(&ci->i_shared_gen) != di->lease_shared_gen ||
- !(di->flags & CEPH_DENTRY_PRIMARY_LINK))
- want = 0;
- spin_unlock(&dentry->d_lock);
- /* Do we still want what we've got? */
- if (want == got)
- return got;
- ceph_put_cap_refs(ci, got);
- return 0;
- }
- /*
- * rmdir and unlink are differ only by the metadata op code
- */
- static int ceph_unlink(struct inode *dir, struct dentry *dentry)
- {
- struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
- struct ceph_mds_client *mdsc = fsc->mdsc;
- struct inode *inode = d_inode(dentry);
- struct ceph_mds_request *req;
- bool try_async = ceph_test_mount_opt(fsc, ASYNC_DIROPS);
- int err = -EROFS;
- int op;
- if (ceph_snap(dir) == CEPH_SNAPDIR) {
- /* rmdir .snap/foo is RMSNAP */
- dout("rmsnap dir %p '%pd' dn %p\n", dir, dentry, dentry);
- op = CEPH_MDS_OP_RMSNAP;
- } else if (ceph_snap(dir) == CEPH_NOSNAP) {
- dout("unlink/rmdir dir %p dn %p inode %p\n",
- dir, dentry, inode);
- op = d_is_dir(dentry) ?
- CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK;
- } else
- goto out;
- retry:
- req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
- if (IS_ERR(req)) {
- err = PTR_ERR(req);
- goto out;
- }
- req->r_dentry = dget(dentry);
- req->r_num_caps = 2;
- req->r_parent = dir;
- ihold(dir);
- req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
- req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
- req->r_inode_drop = ceph_drop_caps_for_unlink(inode);
- if (try_async && op == CEPH_MDS_OP_UNLINK &&
- (req->r_dir_caps = get_caps_for_async_unlink(dir, dentry))) {
- struct ceph_dentry_info *di = ceph_dentry(dentry);
- dout("async unlink on %llu/%.*s caps=%s", ceph_ino(dir),
- dentry->d_name.len, dentry->d_name.name,
- ceph_cap_string(req->r_dir_caps));
- set_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags);
- req->r_callback = ceph_async_unlink_cb;
- req->r_old_inode = d_inode(dentry);
- ihold(req->r_old_inode);
- spin_lock(&dentry->d_lock);
- di->flags |= CEPH_DENTRY_ASYNC_UNLINK;
- spin_unlock(&dentry->d_lock);
- spin_lock(&fsc->async_unlink_conflict_lock);
- hash_add_rcu(fsc->async_unlink_conflict, &di->hnode,
- dentry->d_name.hash);
- spin_unlock(&fsc->async_unlink_conflict_lock);
- err = ceph_mdsc_submit_request(mdsc, dir, req);
- if (!err) {
- /*
- * We have enough caps, so we assume that the unlink
- * will succeed. Fix up the target inode and dcache.
- */
- drop_nlink(inode);
- d_delete(dentry);
- } else {
- spin_lock(&fsc->async_unlink_conflict_lock);
- hash_del_rcu(&di->hnode);
- spin_unlock(&fsc->async_unlink_conflict_lock);
- spin_lock(&dentry->d_lock);
- di->flags &= ~CEPH_DENTRY_ASYNC_UNLINK;
- spin_unlock(&dentry->d_lock);
- if (err == -EJUKEBOX) {
- try_async = false;
- ceph_mdsc_put_request(req);
- goto retry;
- }
- }
- } else {
- set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
- err = ceph_mdsc_do_request(mdsc, dir, req);
- if (!err && !req->r_reply_info.head->is_dentry)
- d_delete(dentry);
- }
- ceph_mdsc_put_request(req);
- out:
- return err;
- }
- static int ceph_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
- struct dentry *old_dentry, struct inode *new_dir,
- struct dentry *new_dentry, unsigned int flags)
- {
- struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(old_dir->i_sb);
- struct ceph_mds_request *req;
- int op = CEPH_MDS_OP_RENAME;
- int err;
- if (flags)
- return -EINVAL;
- if (ceph_snap(old_dir) != ceph_snap(new_dir))
- return -EXDEV;
- if (ceph_snap(old_dir) != CEPH_NOSNAP) {
- if (old_dir == new_dir && ceph_snap(old_dir) == CEPH_SNAPDIR)
- op = CEPH_MDS_OP_RENAMESNAP;
- else
- return -EROFS;
- }
- /* don't allow cross-quota renames */
- if ((old_dir != new_dir) &&
- (!ceph_quota_is_same_realm(old_dir, new_dir)))
- return -EXDEV;
- err = ceph_wait_on_conflict_unlink(new_dentry);
- if (err)
- return err;
- dout("rename dir %p dentry %p to dir %p dentry %p\n",
- old_dir, old_dentry, new_dir, new_dentry);
- req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
- if (IS_ERR(req))
- return PTR_ERR(req);
- ihold(old_dir);
- req->r_dentry = dget(new_dentry);
- req->r_num_caps = 2;
- req->r_old_dentry = dget(old_dentry);
- req->r_old_dentry_dir = old_dir;
- req->r_parent = new_dir;
- ihold(new_dir);
- set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
- req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED;
- req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL;
- req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
- req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
- /* release LINK_RDCACHE on source inode (mds will lock it) */
- req->r_old_inode_drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
- if (d_really_is_positive(new_dentry)) {
- req->r_inode_drop =
- ceph_drop_caps_for_unlink(d_inode(new_dentry));
- }
- err = ceph_mdsc_do_request(mdsc, old_dir, req);
- if (!err && !req->r_reply_info.head->is_dentry) {
- /*
- * Normally d_move() is done by fill_trace (called by
- * do_request, above). If there is no trace, we need
- * to do it here.
- */
- d_move(old_dentry, new_dentry);
- }
- ceph_mdsc_put_request(req);
- return err;
- }
- /*
- * Move dentry to tail of mdsc->dentry_leases list when lease is updated.
- * Leases at front of the list will expire first. (Assume all leases have
- * similar duration)
- *
- * Called under dentry->d_lock.
- */
- void __ceph_dentry_lease_touch(struct ceph_dentry_info *di)
- {
- struct dentry *dn = di->dentry;
- struct ceph_mds_client *mdsc;
- dout("dentry_lease_touch %p %p '%pd'\n", di, dn, dn);
- di->flags |= CEPH_DENTRY_LEASE_LIST;
- if (di->flags & CEPH_DENTRY_SHRINK_LIST) {
- di->flags |= CEPH_DENTRY_REFERENCED;
- return;
- }
- mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
- spin_lock(&mdsc->dentry_list_lock);
- list_move_tail(&di->lease_list, &mdsc->dentry_leases);
- spin_unlock(&mdsc->dentry_list_lock);
- }
- static void __dentry_dir_lease_touch(struct ceph_mds_client* mdsc,
- struct ceph_dentry_info *di)
- {
- di->flags &= ~(CEPH_DENTRY_LEASE_LIST | CEPH_DENTRY_REFERENCED);
- di->lease_gen = 0;
- di->time = jiffies;
- list_move_tail(&di->lease_list, &mdsc->dentry_dir_leases);
- }
- /*
- * When dir lease is used, add dentry to tail of mdsc->dentry_dir_leases
- * list if it's not in the list, otherwise set 'referenced' flag.
- *
- * Called under dentry->d_lock.
- */
- void __ceph_dentry_dir_lease_touch(struct ceph_dentry_info *di)
- {
- struct dentry *dn = di->dentry;
- struct ceph_mds_client *mdsc;
- dout("dentry_dir_lease_touch %p %p '%pd' (offset 0x%llx)\n",
- di, dn, dn, di->offset);
- if (!list_empty(&di->lease_list)) {
- if (di->flags & CEPH_DENTRY_LEASE_LIST) {
- /* don't remove dentry from dentry lease list
- * if its lease is valid */
- if (__dentry_lease_is_valid(di))
- return;
- } else {
- di->flags |= CEPH_DENTRY_REFERENCED;
- return;
- }
- }
- if (di->flags & CEPH_DENTRY_SHRINK_LIST) {
- di->flags |= CEPH_DENTRY_REFERENCED;
- di->flags &= ~CEPH_DENTRY_LEASE_LIST;
- return;
- }
- mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
- spin_lock(&mdsc->dentry_list_lock);
- __dentry_dir_lease_touch(mdsc, di),
- spin_unlock(&mdsc->dentry_list_lock);
- }
- static void __dentry_lease_unlist(struct ceph_dentry_info *di)
- {
- struct ceph_mds_client *mdsc;
- if (di->flags & CEPH_DENTRY_SHRINK_LIST)
- return;
- if (list_empty(&di->lease_list))
- return;
- mdsc = ceph_sb_to_client(di->dentry->d_sb)->mdsc;
- spin_lock(&mdsc->dentry_list_lock);
- list_del_init(&di->lease_list);
- spin_unlock(&mdsc->dentry_list_lock);
- }
- enum {
- KEEP = 0,
- DELETE = 1,
- TOUCH = 2,
- STOP = 4,
- };
- struct ceph_lease_walk_control {
- bool dir_lease;
- bool expire_dir_lease;
- unsigned long nr_to_scan;
- unsigned long dir_lease_ttl;
- };
- static unsigned long
- __dentry_leases_walk(struct ceph_mds_client *mdsc,
- struct ceph_lease_walk_control *lwc,
- int (*check)(struct dentry*, void*))
- {
- struct ceph_dentry_info *di, *tmp;
- struct dentry *dentry, *last = NULL;
- struct list_head* list;
- LIST_HEAD(dispose);
- unsigned long freed = 0;
- int ret = 0;
- list = lwc->dir_lease ? &mdsc->dentry_dir_leases : &mdsc->dentry_leases;
- spin_lock(&mdsc->dentry_list_lock);
- list_for_each_entry_safe(di, tmp, list, lease_list) {
- if (!lwc->nr_to_scan)
- break;
- --lwc->nr_to_scan;
- dentry = di->dentry;
- if (last == dentry)
- break;
- if (!spin_trylock(&dentry->d_lock))
- continue;
- if (__lockref_is_dead(&dentry->d_lockref)) {
- list_del_init(&di->lease_list);
- goto next;
- }
- ret = check(dentry, lwc);
- if (ret & TOUCH) {
- /* move it into tail of dir lease list */
- __dentry_dir_lease_touch(mdsc, di);
- if (!last)
- last = dentry;
- }
- if (ret & DELETE) {
- /* stale lease */
- di->flags &= ~CEPH_DENTRY_REFERENCED;
- if (dentry->d_lockref.count > 0) {
- /* update_dentry_lease() will re-add
- * it to lease list, or
- * ceph_d_delete() will return 1 when
- * last reference is dropped */
- list_del_init(&di->lease_list);
- } else {
- di->flags |= CEPH_DENTRY_SHRINK_LIST;
- list_move_tail(&di->lease_list, &dispose);
- dget_dlock(dentry);
- }
- }
- next:
- spin_unlock(&dentry->d_lock);
- if (ret & STOP)
- break;
- }
- spin_unlock(&mdsc->dentry_list_lock);
- while (!list_empty(&dispose)) {
- di = list_first_entry(&dispose, struct ceph_dentry_info,
- lease_list);
- dentry = di->dentry;
- spin_lock(&dentry->d_lock);
- list_del_init(&di->lease_list);
- di->flags &= ~CEPH_DENTRY_SHRINK_LIST;
- if (di->flags & CEPH_DENTRY_REFERENCED) {
- spin_lock(&mdsc->dentry_list_lock);
- if (di->flags & CEPH_DENTRY_LEASE_LIST) {
- list_add_tail(&di->lease_list,
- &mdsc->dentry_leases);
- } else {
- __dentry_dir_lease_touch(mdsc, di);
- }
- spin_unlock(&mdsc->dentry_list_lock);
- } else {
- freed++;
- }
- spin_unlock(&dentry->d_lock);
- /* ceph_d_delete() does the trick */
- dput(dentry);
- }
- return freed;
- }
- static int __dentry_lease_check(struct dentry *dentry, void *arg)
- {
- struct ceph_dentry_info *di = ceph_dentry(dentry);
- int ret;
- if (__dentry_lease_is_valid(di))
- return STOP;
- ret = __dir_lease_try_check(dentry);
- if (ret == -EBUSY)
- return KEEP;
- if (ret > 0)
- return TOUCH;
- return DELETE;
- }
- static int __dir_lease_check(struct dentry *dentry, void *arg)
- {
- struct ceph_lease_walk_control *lwc = arg;
- struct ceph_dentry_info *di = ceph_dentry(dentry);
- int ret = __dir_lease_try_check(dentry);
- if (ret == -EBUSY)
- return KEEP;
- if (ret > 0) {
- if (time_before(jiffies, di->time + lwc->dir_lease_ttl))
- return STOP;
- /* Move dentry to tail of dir lease list if we don't want
- * to delete it. So dentries in the list are checked in a
- * round robin manner */
- if (!lwc->expire_dir_lease)
- return TOUCH;
- if (dentry->d_lockref.count > 0 ||
- (di->flags & CEPH_DENTRY_REFERENCED))
- return TOUCH;
- /* invalidate dir lease */
- di->lease_shared_gen = 0;
- }
- return DELETE;
- }
- int ceph_trim_dentries(struct ceph_mds_client *mdsc)
- {
- struct ceph_lease_walk_control lwc;
- unsigned long count;
- unsigned long freed;
- spin_lock(&mdsc->caps_list_lock);
- if (mdsc->caps_use_max > 0 &&
- mdsc->caps_use_count > mdsc->caps_use_max)
- count = mdsc->caps_use_count - mdsc->caps_use_max;
- else
- count = 0;
- spin_unlock(&mdsc->caps_list_lock);
- lwc.dir_lease = false;
- lwc.nr_to_scan = CEPH_CAPS_PER_RELEASE * 2;
- freed = __dentry_leases_walk(mdsc, &lwc, __dentry_lease_check);
- if (!lwc.nr_to_scan) /* more invalid leases */
- return -EAGAIN;
- if (lwc.nr_to_scan < CEPH_CAPS_PER_RELEASE)
- lwc.nr_to_scan = CEPH_CAPS_PER_RELEASE;
- lwc.dir_lease = true;
- lwc.expire_dir_lease = freed < count;
- lwc.dir_lease_ttl = mdsc->fsc->mount_options->caps_wanted_delay_max * HZ;
- freed +=__dentry_leases_walk(mdsc, &lwc, __dir_lease_check);
- if (!lwc.nr_to_scan) /* more to check */
- return -EAGAIN;
- return freed > 0 ? 1 : 0;
- }
- /*
- * Ensure a dentry lease will no longer revalidate.
- */
- void ceph_invalidate_dentry_lease(struct dentry *dentry)
- {
- struct ceph_dentry_info *di = ceph_dentry(dentry);
- spin_lock(&dentry->d_lock);
- di->time = jiffies;
- di->lease_shared_gen = 0;
- di->flags &= ~CEPH_DENTRY_PRIMARY_LINK;
- __dentry_lease_unlist(di);
- spin_unlock(&dentry->d_lock);
- }
- /*
- * Check if dentry lease is valid. If not, delete the lease. Try to
- * renew if the least is more than half up.
- */
- static bool __dentry_lease_is_valid(struct ceph_dentry_info *di)
- {
- struct ceph_mds_session *session;
- if (!di->lease_gen)
- return false;
- session = di->lease_session;
- if (session) {
- u32 gen;
- unsigned long ttl;
- gen = atomic_read(&session->s_cap_gen);
- ttl = session->s_cap_ttl;
- if (di->lease_gen == gen &&
- time_before(jiffies, ttl) &&
- time_before(jiffies, di->time))
- return true;
- }
- di->lease_gen = 0;
- return false;
- }
- static int dentry_lease_is_valid(struct dentry *dentry, unsigned int flags)
- {
- struct ceph_dentry_info *di;
- struct ceph_mds_session *session = NULL;
- u32 seq = 0;
- int valid = 0;
- spin_lock(&dentry->d_lock);
- di = ceph_dentry(dentry);
- if (di && __dentry_lease_is_valid(di)) {
- valid = 1;
- if (di->lease_renew_after &&
- time_after(jiffies, di->lease_renew_after)) {
- /*
- * We should renew. If we're in RCU walk mode
- * though, we can't do that so just return
- * -ECHILD.
- */
- if (flags & LOOKUP_RCU) {
- valid = -ECHILD;
- } else {
- session = ceph_get_mds_session(di->lease_session);
- seq = di->lease_seq;
- di->lease_renew_after = 0;
- di->lease_renew_from = jiffies;
- }
- }
- }
- spin_unlock(&dentry->d_lock);
- if (session) {
- ceph_mdsc_lease_send_msg(session, dentry,
- CEPH_MDS_LEASE_RENEW, seq);
- ceph_put_mds_session(session);
- }
- dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid);
- return valid;
- }
- /*
- * Called under dentry->d_lock.
- */
- static int __dir_lease_try_check(const struct dentry *dentry)
- {
- struct ceph_dentry_info *di = ceph_dentry(dentry);
- struct inode *dir;
- struct ceph_inode_info *ci;
- int valid = 0;
- if (!di->lease_shared_gen)
- return 0;
- if (IS_ROOT(dentry))
- return 0;
- dir = d_inode(dentry->d_parent);
- ci = ceph_inode(dir);
- if (spin_trylock(&ci->i_ceph_lock)) {
- if (atomic_read(&ci->i_shared_gen) == di->lease_shared_gen &&
- __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 0))
- valid = 1;
- spin_unlock(&ci->i_ceph_lock);
- } else {
- valid = -EBUSY;
- }
- if (!valid)
- di->lease_shared_gen = 0;
- return valid;
- }
- /*
- * Check if directory-wide content lease/cap is valid.
- */
- static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry,
- struct ceph_mds_client *mdsc)
- {
- struct ceph_inode_info *ci = ceph_inode(dir);
- int valid;
- int shared_gen;
- spin_lock(&ci->i_ceph_lock);
- valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1);
- if (valid) {
- __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_RD);
- shared_gen = atomic_read(&ci->i_shared_gen);
- }
- spin_unlock(&ci->i_ceph_lock);
- if (valid) {
- struct ceph_dentry_info *di;
- spin_lock(&dentry->d_lock);
- di = ceph_dentry(dentry);
- if (dir == d_inode(dentry->d_parent) &&
- di && di->lease_shared_gen == shared_gen)
- __ceph_dentry_dir_lease_touch(di);
- else
- valid = 0;
- spin_unlock(&dentry->d_lock);
- }
- dout("dir_lease_is_valid dir %p v%u dentry %p = %d\n",
- dir, (unsigned)atomic_read(&ci->i_shared_gen), dentry, valid);
- return valid;
- }
- /*
- * Check if cached dentry can be trusted.
- */
- static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags)
- {
- int valid = 0;
- struct dentry *parent;
- struct inode *dir, *inode;
- struct ceph_mds_client *mdsc;
- if (flags & LOOKUP_RCU) {
- parent = READ_ONCE(dentry->d_parent);
- dir = d_inode_rcu(parent);
- if (!dir)
- return -ECHILD;
- inode = d_inode_rcu(dentry);
- } else {
- parent = dget_parent(dentry);
- dir = d_inode(parent);
- inode = d_inode(dentry);
- }
- dout("d_revalidate %p '%pd' inode %p offset 0x%llx\n", dentry,
- dentry, inode, ceph_dentry(dentry)->offset);
- mdsc = ceph_sb_to_client(dir->i_sb)->mdsc;
- /* always trust cached snapped dentries, snapdir dentry */
- if (ceph_snap(dir) != CEPH_NOSNAP) {
- dout("d_revalidate %p '%pd' inode %p is SNAPPED\n", dentry,
- dentry, inode);
- valid = 1;
- } else if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
- valid = 1;
- } else {
- valid = dentry_lease_is_valid(dentry, flags);
- if (valid == -ECHILD)
- return valid;
- if (valid || dir_lease_is_valid(dir, dentry, mdsc)) {
- if (inode)
- valid = ceph_is_any_caps(inode);
- else
- valid = 1;
- }
- }
- if (!valid) {
- struct ceph_mds_request *req;
- int op, err;
- u32 mask;
- if (flags & LOOKUP_RCU)
- return -ECHILD;
- percpu_counter_inc(&mdsc->metric.d_lease_mis);
- op = ceph_snap(dir) == CEPH_SNAPDIR ?
- CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
- req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
- if (!IS_ERR(req)) {
- req->r_dentry = dget(dentry);
- req->r_num_caps = 2;
- req->r_parent = dir;
- ihold(dir);
- mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
- if (ceph_security_xattr_wanted(dir))
- mask |= CEPH_CAP_XATTR_SHARED;
- req->r_args.getattr.mask = cpu_to_le32(mask);
- err = ceph_mdsc_do_request(mdsc, NULL, req);
- switch (err) {
- case 0:
- if (d_really_is_positive(dentry) &&
- d_inode(dentry) == req->r_target_inode)
- valid = 1;
- break;
- case -ENOENT:
- if (d_really_is_negative(dentry))
- valid = 1;
- fallthrough;
- default:
- break;
- }
- ceph_mdsc_put_request(req);
- dout("d_revalidate %p lookup result=%d\n",
- dentry, err);
- }
- } else {
- percpu_counter_inc(&mdsc->metric.d_lease_hit);
- }
- dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid");
- if (!valid)
- ceph_dir_clear_complete(dir);
- if (!(flags & LOOKUP_RCU))
- dput(parent);
- return valid;
- }
- /*
- * Delete unused dentry that doesn't have valid lease
- *
- * Called under dentry->d_lock.
- */
- static int ceph_d_delete(const struct dentry *dentry)
- {
- struct ceph_dentry_info *di;
- /* won't release caps */
- if (d_really_is_negative(dentry))
- return 0;
- if (ceph_snap(d_inode(dentry)) != CEPH_NOSNAP)
- return 0;
- /* vaild lease? */
- di = ceph_dentry(dentry);
- if (di) {
- if (__dentry_lease_is_valid(di))
- return 0;
- if (__dir_lease_try_check(dentry))
- return 0;
- }
- return 1;
- }
- /*
- * Release our ceph_dentry_info.
- */
- static void ceph_d_release(struct dentry *dentry)
- {
- struct ceph_dentry_info *di = ceph_dentry(dentry);
- struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
- dout("d_release %p\n", dentry);
- atomic64_dec(&fsc->mdsc->metric.total_dentries);
- spin_lock(&dentry->d_lock);
- __dentry_lease_unlist(di);
- dentry->d_fsdata = NULL;
- spin_unlock(&dentry->d_lock);
- ceph_put_mds_session(di->lease_session);
- kmem_cache_free(ceph_dentry_cachep, di);
- }
- /*
- * When the VFS prunes a dentry from the cache, we need to clear the
- * complete flag on the parent directory.
- *
- * Called under dentry->d_lock.
- */
- static void ceph_d_prune(struct dentry *dentry)
- {
- struct ceph_inode_info *dir_ci;
- struct ceph_dentry_info *di;
- dout("ceph_d_prune %pd %p\n", dentry, dentry);
- /* do we have a valid parent? */
- if (IS_ROOT(dentry))
- return;
- /* we hold d_lock, so d_parent is stable */
- dir_ci = ceph_inode(d_inode(dentry->d_parent));
- if (dir_ci->i_vino.snap == CEPH_SNAPDIR)
- return;
- /* who calls d_delete() should also disable dcache readdir */
- if (d_really_is_negative(dentry))
- return;
- /* d_fsdata does not get cleared until d_release */
- if (!d_unhashed(dentry)) {
- __ceph_dir_clear_complete(dir_ci);
- return;
- }
- /* Disable dcache readdir just in case that someone called d_drop()
- * or d_invalidate(), but MDS didn't revoke CEPH_CAP_FILE_SHARED
- * properly (dcache readdir is still enabled) */
- di = ceph_dentry(dentry);
- if (di->offset > 0 &&
- di->lease_shared_gen == atomic_read(&dir_ci->i_shared_gen))
- __ceph_dir_clear_ordered(dir_ci);
- }
- /*
- * read() on a dir. This weird interface hack only works if mounted
- * with '-o dirstat'.
- */
- static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size,
- loff_t *ppos)
- {
- struct ceph_dir_file_info *dfi = file->private_data;
- struct inode *inode = file_inode(file);
- struct ceph_inode_info *ci = ceph_inode(inode);
- int left;
- const int bufsize = 1024;
- if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT))
- return -EISDIR;
- if (!dfi->dir_info) {
- dfi->dir_info = kmalloc(bufsize, GFP_KERNEL);
- if (!dfi->dir_info)
- return -ENOMEM;
- dfi->dir_info_len =
- snprintf(dfi->dir_info, bufsize,
- "entries: %20lld\n"
- " files: %20lld\n"
- " subdirs: %20lld\n"
- "rentries: %20lld\n"
- " rfiles: %20lld\n"
- " rsubdirs: %20lld\n"
- "rbytes: %20lld\n"
- "rctime: %10lld.%09ld\n",
- ci->i_files + ci->i_subdirs,
- ci->i_files,
- ci->i_subdirs,
- ci->i_rfiles + ci->i_rsubdirs,
- ci->i_rfiles,
- ci->i_rsubdirs,
- ci->i_rbytes,
- ci->i_rctime.tv_sec,
- ci->i_rctime.tv_nsec);
- }
- if (*ppos >= dfi->dir_info_len)
- return 0;
- size = min_t(unsigned, size, dfi->dir_info_len-*ppos);
- left = copy_to_user(buf, dfi->dir_info + *ppos, size);
- if (left == size)
- return -EFAULT;
- *ppos += (size - left);
- return size - left;
- }
- /*
- * Return name hash for a given dentry. This is dependent on
- * the parent directory's hash function.
- */
- unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn)
- {
- struct ceph_inode_info *dci = ceph_inode(dir);
- unsigned hash;
- switch (dci->i_dir_layout.dl_dir_hash) {
- case 0: /* for backward compat */
- case CEPH_STR_HASH_LINUX:
- return dn->d_name.hash;
- default:
- spin_lock(&dn->d_lock);
- hash = ceph_str_hash(dci->i_dir_layout.dl_dir_hash,
- dn->d_name.name, dn->d_name.len);
- spin_unlock(&dn->d_lock);
- return hash;
- }
- }
- const struct file_operations ceph_dir_fops = {
- .read = ceph_read_dir,
- .iterate = ceph_readdir,
- .llseek = ceph_dir_llseek,
- .open = ceph_open,
- .release = ceph_release,
- .unlocked_ioctl = ceph_ioctl,
- .compat_ioctl = compat_ptr_ioctl,
- .fsync = ceph_fsync,
- .lock = ceph_lock,
- .flock = ceph_flock,
- };
- const struct file_operations ceph_snapdir_fops = {
- .iterate = ceph_readdir,
- .llseek = ceph_dir_llseek,
- .open = ceph_open,
- .release = ceph_release,
- };
- const struct inode_operations ceph_dir_iops = {
- .lookup = ceph_lookup,
- .permission = ceph_permission,
- .getattr = ceph_getattr,
- .setattr = ceph_setattr,
- .listxattr = ceph_listxattr,
- .get_acl = ceph_get_acl,
- .set_acl = ceph_set_acl,
- .mknod = ceph_mknod,
- .symlink = ceph_symlink,
- .mkdir = ceph_mkdir,
- .link = ceph_link,
- .unlink = ceph_unlink,
- .rmdir = ceph_unlink,
- .rename = ceph_rename,
- .create = ceph_create,
- .atomic_open = ceph_atomic_open,
- };
- const struct inode_operations ceph_snapdir_iops = {
- .lookup = ceph_lookup,
- .permission = ceph_permission,
- .getattr = ceph_getattr,
- .mkdir = ceph_mkdir,
- .rmdir = ceph_unlink,
- .rename = ceph_rename,
- };
- const struct dentry_operations ceph_dentry_ops = {
- .d_revalidate = ceph_d_revalidate,
- .d_delete = ceph_d_delete,
- .d_release = ceph_d_release,
- .d_prune = ceph_d_prune,
- .d_init = ceph_d_init,
- };
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