| #include <linux/ceph/ceph_debug.h> |
| |
| #include <linux/spinlock.h> |
| #include <linux/fs_struct.h> |
| #include <linux/namei.h> |
| #include <linux/slab.h> |
| #include <linux/sched.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 inode_operations ceph_dir_iops; |
| const struct file_operations ceph_dir_fops; |
| const struct dentry_operations ceph_dentry_ops; |
| |
| /* |
| * Initialize ceph dentry state. |
| */ |
| int ceph_init_dentry(struct dentry *dentry) |
| { |
| struct ceph_dentry_info *di; |
| |
| if (dentry->d_fsdata) |
| return 0; |
| |
| di = kmem_cache_alloc(ceph_dentry_cachep, GFP_NOFS | __GFP_ZERO); |
| if (!di) |
| return -ENOMEM; /* oh well */ |
| |
| spin_lock(&dentry->d_lock); |
| if (dentry->d_fsdata) { |
| /* lost a race */ |
| kmem_cache_free(ceph_dentry_cachep, di); |
| goto out_unlock; |
| } |
| |
| if (dentry->d_parent == NULL || /* nfs fh_to_dentry */ |
| ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) |
| d_set_d_op(dentry, &ceph_dentry_ops); |
| else if (ceph_snap(dentry->d_parent->d_inode) == CEPH_SNAPDIR) |
| d_set_d_op(dentry, &ceph_snapdir_dentry_ops); |
| else |
| d_set_d_op(dentry, &ceph_snap_dentry_ops); |
| |
| di->dentry = dentry; |
| di->lease_session = NULL; |
| dentry->d_time = jiffies; |
| /* avoid reordering d_fsdata setup so that the check above is safe */ |
| smp_mb(); |
| dentry->d_fsdata = di; |
| ceph_dentry_lru_add(dentry); |
| out_unlock: |
| spin_unlock(&dentry->d_lock); |
| return 0; |
| } |
| |
| struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry) |
| { |
| struct inode *inode = NULL; |
| |
| if (!dentry) |
| return NULL; |
| |
| spin_lock(&dentry->d_lock); |
| if (dentry->d_parent) { |
| inode = dentry->d_parent->d_inode; |
| ihold(inode); |
| } |
| spin_unlock(&dentry->d_lock); |
| return inode; |
| } |
| |
| |
| /* |
| * for readdir, we encode the directory frag and offset within that |
| * frag into f_pos. |
| */ |
| static unsigned fpos_frag(loff_t p) |
| { |
| return p >> 32; |
| } |
| static unsigned fpos_off(loff_t p) |
| { |
| return p & 0xffffffff; |
| } |
| |
| /* |
| * When possible, we try to satisfy a readdir by peeking at the |
| * dcache. We make this work by carefully ordering dentries on |
| * d_u.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. |
| * |
| * D_COMPLETE tells indicates 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 *filp, |
| void *dirent, filldir_t filldir) |
| { |
| struct ceph_file_info *fi = filp->private_data; |
| struct dentry *parent = filp->f_dentry; |
| struct inode *dir = parent->d_inode; |
| struct list_head *p; |
| struct dentry *dentry, *last; |
| struct ceph_dentry_info *di; |
| int err = 0; |
| |
| /* claim ref on last dentry we returned */ |
| last = fi->dentry; |
| fi->dentry = NULL; |
| |
| dout("__dcache_readdir %p at %llu (last %p)\n", dir, filp->f_pos, |
| last); |
| |
| spin_lock(&parent->d_lock); |
| |
| /* start at beginning? */ |
| if (filp->f_pos == 2 || last == NULL || |
| filp->f_pos < ceph_dentry(last)->offset) { |
| if (list_empty(&parent->d_subdirs)) |
| goto out_unlock; |
| p = parent->d_subdirs.prev; |
| dout(" initial p %p/%p\n", p->prev, p->next); |
| } else { |
| p = last->d_u.d_child.prev; |
| } |
| |
| more: |
| dentry = list_entry(p, struct dentry, d_u.d_child); |
| di = ceph_dentry(dentry); |
| while (1) { |
| dout(" p %p/%p %s d_subdirs %p/%p\n", p->prev, p->next, |
| d_unhashed(dentry) ? "!hashed" : "hashed", |
| parent->d_subdirs.prev, parent->d_subdirs.next); |
| if (p == &parent->d_subdirs) { |
| fi->flags |= CEPH_F_ATEND; |
| goto out_unlock; |
| } |
| spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED); |
| if (!d_unhashed(dentry) && dentry->d_inode && |
| ceph_snap(dentry->d_inode) != CEPH_SNAPDIR && |
| ceph_ino(dentry->d_inode) != CEPH_INO_CEPH && |
| filp->f_pos <= di->offset) |
| break; |
| dout(" skipping %p %.*s at %llu (%llu)%s%s\n", dentry, |
| dentry->d_name.len, dentry->d_name.name, di->offset, |
| filp->f_pos, d_unhashed(dentry) ? " unhashed" : "", |
| !dentry->d_inode ? " null" : ""); |
| spin_unlock(&dentry->d_lock); |
| p = p->prev; |
| dentry = list_entry(p, struct dentry, d_u.d_child); |
| di = ceph_dentry(dentry); |
| } |
| |
| dget_dlock(dentry); |
| spin_unlock(&dentry->d_lock); |
| spin_unlock(&parent->d_lock); |
| |
| dout(" %llu (%llu) dentry %p %.*s %p\n", di->offset, filp->f_pos, |
| dentry, dentry->d_name.len, dentry->d_name.name, dentry->d_inode); |
| filp->f_pos = di->offset; |
| err = filldir(dirent, dentry->d_name.name, |
| dentry->d_name.len, di->offset, |
| ceph_translate_ino(dentry->d_sb, dentry->d_inode->i_ino), |
| dentry->d_inode->i_mode >> 12); |
| |
| if (last) { |
| if (err < 0) { |
| /* remember our position */ |
| fi->dentry = last; |
| fi->next_offset = di->offset; |
| } else { |
| dput(last); |
| } |
| } |
| last = dentry; |
| |
| if (err < 0) |
| goto out; |
| |
| filp->f_pos++; |
| |
| /* make sure a dentry wasn't dropped while we didn't have parent lock */ |
| if (!ceph_dir_test_complete(dir)) { |
| dout(" lost D_COMPLETE on %p; falling back to mds\n", dir); |
| err = -EAGAIN; |
| goto out; |
| } |
| |
| spin_lock(&parent->d_lock); |
| p = p->prev; /* advance to next dentry */ |
| goto more; |
| |
| out_unlock: |
| spin_unlock(&parent->d_lock); |
| out: |
| if (last) |
| dput(last); |
| return err; |
| } |
| |
| /* |
| * 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_file_info *fi, const char *name, |
| int len) |
| { |
| kfree(fi->last_name); |
| fi->last_name = kmalloc(len+1, GFP_NOFS); |
| if (!fi->last_name) |
| return -ENOMEM; |
| memcpy(fi->last_name, name, len); |
| fi->last_name[len] = 0; |
| dout("note_last_dentry '%s'\n", fi->last_name); |
| return 0; |
| } |
| |
| static int ceph_readdir(struct file *filp, void *dirent, filldir_t filldir) |
| { |
| struct ceph_file_info *fi = filp->private_data; |
| struct inode *inode = filp->f_dentry->d_inode; |
| 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; |
| unsigned frag = fpos_frag(filp->f_pos); |
| int off = fpos_off(filp->f_pos); |
| int err; |
| u32 ftype; |
| struct ceph_mds_reply_info_parsed *rinfo; |
| const int max_entries = fsc->mount_options->max_readdir; |
| const int max_bytes = fsc->mount_options->max_readdir_bytes; |
| |
| dout("readdir %p filp %p frag %u off %u\n", inode, filp, frag, off); |
| if (fi->flags & CEPH_F_ATEND) |
| return 0; |
| |
| /* always start with . and .. */ |
| if (filp->f_pos == 0) { |
| /* note dir version at start of readdir so we can tell |
| * if any dentries get dropped */ |
| fi->dir_release_count = ci->i_release_count; |
| |
| dout("readdir off 0 -> '.'\n"); |
| if (filldir(dirent, ".", 1, ceph_make_fpos(0, 0), |
| ceph_translate_ino(inode->i_sb, inode->i_ino), |
| inode->i_mode >> 12) < 0) |
| return 0; |
| filp->f_pos = 1; |
| off = 1; |
| } |
| if (filp->f_pos == 1) { |
| ino_t ino = parent_ino(filp->f_dentry); |
| dout("readdir off 1 -> '..'\n"); |
| if (filldir(dirent, "..", 2, ceph_make_fpos(0, 1), |
| ceph_translate_ino(inode->i_sb, ino), |
| inode->i_mode >> 12) < 0) |
| return 0; |
| filp->f_pos = 2; |
| off = 2; |
| } |
| |
| /* can we use the dcache? */ |
| spin_lock(&ci->i_ceph_lock); |
| if ((filp->f_pos == 2 || fi->dentry) && |
| !ceph_test_mount_opt(fsc, NOASYNCREADDIR) && |
| ceph_snap(inode) != CEPH_SNAPDIR && |
| ceph_dir_test_complete(inode) && |
| __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) { |
| spin_unlock(&ci->i_ceph_lock); |
| err = __dcache_readdir(filp, dirent, filldir); |
| if (err != -EAGAIN) |
| return err; |
| } else { |
| spin_unlock(&ci->i_ceph_lock); |
| } |
| if (fi->dentry) { |
| err = note_last_dentry(fi, fi->dentry->d_name.name, |
| fi->dentry->d_name.len); |
| if (err) |
| return err; |
| dput(fi->dentry); |
| fi->dentry = NULL; |
| } |
| |
| /* proceed with a normal readdir */ |
| |
| more: |
| /* do we have the correct frag content buffered? */ |
| if (fi->frag != frag || fi->last_readdir == NULL) { |
| 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 (fi->last_readdir) { |
| ceph_mdsc_put_request(fi->last_readdir); |
| fi->last_readdir = NULL; |
| } |
| |
| /* requery frag tree, as the frag topology may have changed */ |
| frag = ceph_choose_frag(ceph_inode(inode), frag, NULL, NULL); |
| |
| dout("readdir fetching %llx.%llx frag %x offset '%s'\n", |
| ceph_vinop(inode), frag, fi->last_name); |
| req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); |
| if (IS_ERR(req)) |
| return PTR_ERR(req); |
| req->r_inode = inode; |
| ihold(inode); |
| req->r_dentry = dget(filp->f_dentry); |
| /* hints to request -> mds selection code */ |
| req->r_direct_mode = USE_AUTH_MDS; |
| req->r_direct_hash = ceph_frag_value(frag); |
| req->r_direct_is_hash = true; |
| req->r_path2 = kstrdup(fi->last_name, GFP_NOFS); |
| req->r_readdir_offset = fi->next_offset; |
| req->r_args.readdir.frag = cpu_to_le32(frag); |
| req->r_args.readdir.max_entries = cpu_to_le32(max_entries); |
| req->r_args.readdir.max_bytes = cpu_to_le32(max_bytes); |
| req->r_num_caps = max_entries + 1; |
| 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\n", err, frag, |
| (int)req->r_reply_info.dir_end, |
| (int)req->r_reply_info.dir_complete); |
| |
| if (!req->r_did_prepopulate) { |
| dout("readdir !did_prepopulate"); |
| fi->dir_release_count--; /* preclude D_COMPLETE */ |
| } |
| |
| /* note next offset and last dentry name */ |
| fi->offset = fi->next_offset; |
| fi->last_readdir = req; |
| |
| if (req->r_reply_info.dir_end) { |
| kfree(fi->last_name); |
| fi->last_name = NULL; |
| if (ceph_frag_is_rightmost(frag)) |
| fi->next_offset = 2; |
| else |
| fi->next_offset = 0; |
| } else { |
| rinfo = &req->r_reply_info; |
| err = note_last_dentry(fi, |
| rinfo->dir_dname[rinfo->dir_nr-1], |
| rinfo->dir_dname_len[rinfo->dir_nr-1]); |
| if (err) |
| return err; |
| fi->next_offset += rinfo->dir_nr; |
| } |
| } |
| |
| rinfo = &fi->last_readdir->r_reply_info; |
| dout("readdir frag %x num %d off %d chunkoff %d\n", frag, |
| rinfo->dir_nr, off, fi->offset); |
| while (off >= fi->offset && off - fi->offset < rinfo->dir_nr) { |
| u64 pos = ceph_make_fpos(frag, off); |
| struct ceph_mds_reply_inode *in = |
| rinfo->dir_in[off - fi->offset].in; |
| struct ceph_vino vino; |
| ino_t ino; |
| |
| dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n", |
| off, off - fi->offset, rinfo->dir_nr, pos, |
| rinfo->dir_dname_len[off - fi->offset], |
| rinfo->dir_dname[off - fi->offset], in); |
| BUG_ON(!in); |
| ftype = le32_to_cpu(in->mode) >> 12; |
| vino.ino = le64_to_cpu(in->ino); |
| vino.snap = le64_to_cpu(in->snapid); |
| ino = ceph_vino_to_ino(vino); |
| if (filldir(dirent, |
| rinfo->dir_dname[off - fi->offset], |
| rinfo->dir_dname_len[off - fi->offset], |
| pos, |
| ceph_translate_ino(inode->i_sb, ino), ftype) < 0) { |
| dout("filldir stopping us...\n"); |
| return 0; |
| } |
| off++; |
| filp->f_pos = pos + 1; |
| } |
| |
| if (fi->last_name) { |
| ceph_mdsc_put_request(fi->last_readdir); |
| fi->last_readdir = NULL; |
| goto more; |
| } |
| |
| /* more frags? */ |
| if (!ceph_frag_is_rightmost(frag)) { |
| frag = ceph_frag_next(frag); |
| off = 0; |
| filp->f_pos = ceph_make_fpos(frag, off); |
| dout("readdir next frag is %x\n", frag); |
| goto more; |
| } |
| fi->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. |
| */ |
| spin_lock(&ci->i_ceph_lock); |
| if (ci->i_release_count == fi->dir_release_count) { |
| ceph_dir_set_complete(inode); |
| ci->i_max_offset = filp->f_pos; |
| } |
| spin_unlock(&ci->i_ceph_lock); |
| |
| dout("readdir %p filp %p done.\n", inode, filp); |
| return 0; |
| } |
| |
| static void reset_readdir(struct ceph_file_info *fi) |
| { |
| if (fi->last_readdir) { |
| ceph_mdsc_put_request(fi->last_readdir); |
| fi->last_readdir = NULL; |
| } |
| kfree(fi->last_name); |
| fi->last_name = NULL; |
| fi->next_offset = 2; /* compensate for . and .. */ |
| if (fi->dentry) { |
| dput(fi->dentry); |
| fi->dentry = NULL; |
| } |
| fi->flags &= ~CEPH_F_ATEND; |
| } |
| |
| static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int origin) |
| { |
| struct ceph_file_info *fi = file->private_data; |
| struct inode *inode = file->f_mapping->host; |
| loff_t old_offset = offset; |
| loff_t retval; |
| |
| mutex_lock(&inode->i_mutex); |
| retval = -EINVAL; |
| switch (origin) { |
| case SEEK_END: |
| offset += inode->i_size + 2; /* FIXME */ |
| break; |
| case SEEK_CUR: |
| offset += file->f_pos; |
| case SEEK_SET: |
| break; |
| default: |
| goto out; |
| } |
| |
| if (offset >= 0 && offset <= inode->i_sb->s_maxbytes) { |
| if (offset != file->f_pos) { |
| file->f_pos = offset; |
| file->f_version = 0; |
| fi->flags &= ~CEPH_F_ATEND; |
| } |
| retval = offset; |
| |
| /* |
| * discard buffered readdir content on seekdir(0), or |
| * seek to new frag, or seek prior to current chunk. |
| */ |
| if (offset == 0 || |
| fpos_frag(offset) != fpos_frag(old_offset) || |
| fpos_off(offset) < fi->offset) { |
| dout("dir_llseek dropping %p content\n", file); |
| reset_readdir(fi); |
| } |
| |
| /* bump dir_release_count if we did a forward seek */ |
| if (offset > old_offset) |
| fi->dir_release_count--; |
| } |
| out: |
| mutex_unlock(&inode->i_mutex); |
| return retval; |
| } |
| |
| /* |
| * Handle lookups for the hidden .snap directory. |
| */ |
| int ceph_handle_snapdir(struct ceph_mds_request *req, |
| struct dentry *dentry, int err) |
| { |
| struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); |
| struct inode *parent = dentry->d_parent->d_inode; /* we hold i_mutex */ |
| |
| /* .snap dir? */ |
| if (err == -ENOENT && |
| ceph_snap(parent) == CEPH_NOSNAP && |
| strcmp(dentry->d_name.name, |
| fsc->mount_options->snapdir_name) == 0) { |
| struct inode *inode = ceph_get_snapdir(parent); |
| dout("ENOENT on snapdir %p '%.*s', linking to snapdir %p\n", |
| dentry, dentry->d_name.len, dentry->d_name.name, inode); |
| BUG_ON(!d_unhashed(dentry)); |
| d_add(dentry, inode); |
| err = 0; |
| } |
| return err; |
| } |
| |
| /* |
| * 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, dentry->d_inode); |
| if (dentry->d_inode) { |
| 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 int 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, |
| struct nameidata *nd) |
| { |
| struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
| struct ceph_mds_client *mdsc = fsc->mdsc; |
| struct ceph_mds_request *req; |
| int op; |
| int err; |
| |
| dout("lookup %p dentry %p '%.*s'\n", |
| dir, dentry, dentry->d_name.len, dentry->d_name.name); |
| |
| if (dentry->d_name.len > NAME_MAX) |
| return ERR_PTR(-ENAMETOOLONG); |
| |
| err = ceph_init_dentry(dentry); |
| if (err < 0) |
| return ERR_PTR(err); |
| |
| /* open (but not create!) intent? */ |
| if (nd && |
| (nd->flags & LOOKUP_OPEN) && |
| !(nd->intent.open.flags & O_CREAT)) { |
| int mode = nd->intent.open.create_mode & ~current->fs->umask; |
| return ceph_lookup_open(dir, dentry, nd, mode, 1); |
| } |
| |
| /* can we conclude ENOENT locally? */ |
| if (dentry->d_inode == NULL) { |
| 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 %d\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_dir_test_complete(dir) && |
| (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) { |
| spin_unlock(&ci->i_ceph_lock); |
| dout(" dir %p complete, -ENOENT\n", dir); |
| d_add(dentry, NULL); |
| di->lease_shared_gen = 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; |
| /* we only need inode linkage */ |
| req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); |
| req->r_locked_dir = dir; |
| err = ceph_mdsc_do_request(mdsc, NULL, req); |
| err = ceph_handle_snapdir(req, dentry, err); |
| 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, NULL); |
| |
| 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). Link our |
| * dentry to that inode, but don't hash it, just in |
| * case the VFS wants to dereference it. |
| */ |
| BUG_ON(!result->d_inode); |
| d_instantiate(dentry, result->d_inode); |
| return 0; |
| } |
| return PTR_ERR(result); |
| } |
| |
| static int ceph_mknod(struct inode *dir, struct dentry *dentry, |
| int mode, dev_t rdev) |
| { |
| struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
| struct ceph_mds_client *mdsc = fsc->mdsc; |
| struct ceph_mds_request *req; |
| int err; |
| |
| if (ceph_snap(dir) != CEPH_NOSNAP) |
| return -EROFS; |
| |
| dout("mknod in dir %p dentry %p mode 0%o rdev %d\n", |
| dir, dentry, mode, rdev); |
| req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, 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_locked_dir = dir; |
| 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; |
| req->r_dentry_unless = CEPH_CAP_FILE_EXCL; |
| 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); |
| if (err) |
| d_drop(dentry); |
| return err; |
| } |
| |
| static int ceph_create(struct inode *dir, struct dentry *dentry, int mode, |
| struct nameidata *nd) |
| { |
| dout("create in dir %p dentry %p name '%.*s'\n", |
| dir, dentry, dentry->d_name.len, dentry->d_name.name); |
| |
| if (ceph_snap(dir) != CEPH_NOSNAP) |
| return -EROFS; |
| |
| if (nd) { |
| BUG_ON((nd->flags & LOOKUP_OPEN) == 0); |
| dentry = ceph_lookup_open(dir, dentry, nd, mode, 0); |
| /* hrm, what should i do here if we get aliased? */ |
| if (IS_ERR(dentry)) |
| return PTR_ERR(dentry); |
| return 0; |
| } |
| |
| /* fall back to mknod */ |
| return ceph_mknod(dir, dentry, (mode & ~S_IFMT) | S_IFREG, 0); |
| } |
| |
| static int ceph_symlink(struct inode *dir, struct dentry *dentry, |
| const char *dest) |
| { |
| struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
| struct ceph_mds_client *mdsc = fsc->mdsc; |
| struct ceph_mds_request *req; |
| int err; |
| |
| if (ceph_snap(dir) != CEPH_NOSNAP) |
| return -EROFS; |
| |
| 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)) { |
| d_drop(dentry); |
| return PTR_ERR(req); |
| } |
| req->r_dentry = dget(dentry); |
| req->r_num_caps = 2; |
| req->r_path2 = kstrdup(dest, GFP_NOFS); |
| req->r_locked_dir = dir; |
| req->r_dentry_drop = CEPH_CAP_FILE_SHARED; |
| req->r_dentry_unless = CEPH_CAP_FILE_EXCL; |
| 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); |
| if (err) |
| d_drop(dentry); |
| return err; |
| } |
| |
| static int ceph_mkdir(struct inode *dir, struct dentry *dentry, int 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; |
| int err = -EROFS; |
| int op; |
| |
| if (ceph_snap(dir) == CEPH_SNAPDIR) { |
| /* mkdir .snap/foo is a MKSNAP */ |
| op = CEPH_MDS_OP_MKSNAP; |
| dout("mksnap dir %p snap '%.*s' dn %p\n", dir, |
| dentry->d_name.len, dentry->d_name.name, dentry); |
| } else if (ceph_snap(dir) == CEPH_NOSNAP) { |
| dout("mkdir dir %p dn %p mode 0%o\n", dir, dentry, mode); |
| op = CEPH_MDS_OP_MKDIR; |
| } else { |
| 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_locked_dir = dir; |
| req->r_args.mkdir.mode = cpu_to_le32(mode); |
| req->r_dentry_drop = CEPH_CAP_FILE_SHARED; |
| req->r_dentry_unless = CEPH_CAP_FILE_EXCL; |
| 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 < 0) |
| d_drop(dentry); |
| return err; |
| } |
| |
| static int ceph_link(struct dentry *old_dentry, 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 ceph_mds_request *req; |
| int 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); /* or inode? hrm. */ |
| req->r_old_dentry_dir = ceph_get_dentry_parent_inode(old_dentry); |
| req->r_locked_dir = dir; |
| req->r_dentry_drop = CEPH_CAP_FILE_SHARED; |
| req->r_dentry_unless = CEPH_CAP_FILE_EXCL; |
| err = ceph_mdsc_do_request(mdsc, dir, req); |
| if (err) { |
| d_drop(dentry); |
| } else if (!req->r_reply_info.head->is_dentry) { |
| ihold(old_dentry->d_inode); |
| d_instantiate(dentry, old_dentry->d_inode); |
| } |
| ceph_mdsc_put_request(req); |
| return err; |
| } |
| |
| /* |
| * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it |
| * looks like the link count will hit 0, drop any other caps (other |
| * than PIN) we don't specifically want (due to the file still being |
| * open). |
| */ |
| static int drop_caps_for_unlink(struct inode *inode) |
| { |
| struct ceph_inode_info *ci = ceph_inode(inode); |
| int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; |
| |
| spin_lock(&ci->i_ceph_lock); |
| if (inode->i_nlink == 1) { |
| drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN); |
| ci->i_ceph_flags |= CEPH_I_NODELAY; |
| } |
| spin_unlock(&ci->i_ceph_lock); |
| return drop; |
| } |
| |
| /* |
| * 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 = dentry->d_inode; |
| struct ceph_mds_request *req; |
| int err = -EROFS; |
| int op; |
| |
| if (ceph_snap(dir) == CEPH_SNAPDIR) { |
| /* rmdir .snap/foo is RMSNAP */ |
| dout("rmsnap dir %p '%.*s' dn %p\n", dir, dentry->d_name.len, |
| dentry->d_name.name, 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 = ((dentry->d_inode->i_mode & S_IFMT) == S_IFDIR) ? |
| CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK; |
| } else |
| 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_locked_dir = dir; |
| req->r_dentry_drop = CEPH_CAP_FILE_SHARED; |
| req->r_dentry_unless = CEPH_CAP_FILE_EXCL; |
| req->r_inode_drop = drop_caps_for_unlink(inode); |
| 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 inode *old_dir, struct dentry *old_dentry, |
| struct inode *new_dir, struct dentry *new_dentry) |
| { |
| struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb); |
| struct ceph_mds_client *mdsc = fsc->mdsc; |
| struct ceph_mds_request *req; |
| int err; |
| |
| if (ceph_snap(old_dir) != ceph_snap(new_dir)) |
| return -EXDEV; |
| if (ceph_snap(old_dir) != CEPH_NOSNAP || |
| ceph_snap(new_dir) != CEPH_NOSNAP) |
| return -EROFS; |
| 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, CEPH_MDS_OP_RENAME, USE_AUTH_MDS); |
| if (IS_ERR(req)) |
| return PTR_ERR(req); |
| req->r_dentry = dget(new_dentry); |
| req->r_num_caps = 2; |
| req->r_old_dentry = dget(old_dentry); |
| req->r_old_dentry_dir = ceph_get_dentry_parent_inode(old_dentry); |
| req->r_locked_dir = new_dir; |
| 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; |
| if (new_dentry->d_inode) |
| req->r_inode_drop = drop_caps_for_unlink(new_dentry->d_inode); |
| 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 screws up d_subdirs order */ |
| ceph_dir_clear_complete(new_dir); |
| |
| d_move(old_dentry, new_dentry); |
| |
| /* ensure target dentry is invalidated, despite |
| rehashing bug in vfs_rename_dir */ |
| ceph_invalidate_dentry_lease(new_dentry); |
| } |
| ceph_mdsc_put_request(req); |
| return err; |
| } |
| |
| /* |
| * Ensure a dentry lease will no longer revalidate. |
| */ |
| void ceph_invalidate_dentry_lease(struct dentry *dentry) |
| { |
| spin_lock(&dentry->d_lock); |
| dentry->d_time = jiffies; |
| ceph_dentry(dentry)->lease_shared_gen = 0; |
| 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 int dentry_lease_is_valid(struct dentry *dentry) |
| { |
| struct ceph_dentry_info *di; |
| struct ceph_mds_session *s; |
| int valid = 0; |
| u32 gen; |
| unsigned long ttl; |
| struct ceph_mds_session *session = NULL; |
| struct inode *dir = NULL; |
| u32 seq = 0; |
| |
| spin_lock(&dentry->d_lock); |
| di = ceph_dentry(dentry); |
| if (di->lease_session) { |
| s = di->lease_session; |
| spin_lock(&s->s_cap_lock); |
| gen = s->s_cap_gen; |
| ttl = s->s_cap_ttl; |
| spin_unlock(&s->s_cap_lock); |
| |
| if (di->lease_gen == gen && |
| time_before(jiffies, dentry->d_time) && |
| time_before(jiffies, ttl)) { |
| valid = 1; |
| if (di->lease_renew_after && |
| time_after(jiffies, di->lease_renew_after)) { |
| /* we should renew */ |
| dir = dentry->d_parent->d_inode; |
| session = ceph_get_mds_session(s); |
| 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, dir, dentry, |
| CEPH_MDS_LEASE_RENEW, seq); |
| ceph_put_mds_session(session); |
| } |
| dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid); |
| 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_inode_info *ci = ceph_inode(dir); |
| struct ceph_dentry_info *di = ceph_dentry(dentry); |
| int valid = 0; |
| |
| spin_lock(&ci->i_ceph_lock); |
| if (ci->i_shared_gen == di->lease_shared_gen) |
| valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1); |
| spin_unlock(&ci->i_ceph_lock); |
| dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n", |
| dir, (unsigned)ci->i_shared_gen, dentry, |
| (unsigned)di->lease_shared_gen, valid); |
| return valid; |
| } |
| |
| /* |
| * Check if cached dentry can be trusted. |
| */ |
| static int ceph_d_revalidate(struct dentry *dentry, struct nameidata *nd) |
| { |
| int valid = 0; |
| struct inode *dir; |
| |
| if (nd && nd->flags & LOOKUP_RCU) |
| return -ECHILD; |
| |
| dout("d_revalidate %p '%.*s' inode %p offset %lld\n", dentry, |
| dentry->d_name.len, dentry->d_name.name, dentry->d_inode, |
| ceph_dentry(dentry)->offset); |
| |
| dir = ceph_get_dentry_parent_inode(dentry); |
| |
| /* always trust cached snapped dentries, snapdir dentry */ |
| if (ceph_snap(dir) != CEPH_NOSNAP) { |
| dout("d_revalidate %p '%.*s' inode %p is SNAPPED\n", dentry, |
| dentry->d_name.len, dentry->d_name.name, dentry->d_inode); |
| valid = 1; |
| } else if (dentry->d_inode && |
| ceph_snap(dentry->d_inode) == CEPH_SNAPDIR) { |
| valid = 1; |
| } else if (dentry_lease_is_valid(dentry) || |
| dir_lease_is_valid(dir, dentry)) { |
| valid = 1; |
| } |
| |
| dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid"); |
| if (valid) |
| ceph_dentry_lru_touch(dentry); |
| else |
| d_drop(dentry); |
| iput(dir); |
| return valid; |
| } |
| |
| /* |
| * Release our ceph_dentry_info. |
| */ |
| static void ceph_d_release(struct dentry *dentry) |
| { |
| struct ceph_dentry_info *di = ceph_dentry(dentry); |
| |
| dout("d_release %p\n", dentry); |
| ceph_dentry_lru_del(dentry); |
| if (di->lease_session) |
| ceph_put_mds_session(di->lease_session); |
| kmem_cache_free(ceph_dentry_cachep, di); |
| dentry->d_fsdata = NULL; |
| } |
| |
| static int ceph_snapdir_d_revalidate(struct dentry *dentry, |
| struct nameidata *nd) |
| { |
| /* |
| * Eventually, we'll want to revalidate snapped metadata |
| * too... probably... |
| */ |
| return 1; |
| } |
| |
| /* |
| * Set/clear/test dir complete flag on the dir's dentry. |
| */ |
| void ceph_dir_set_complete(struct inode *inode) |
| { |
| struct dentry *dentry = d_find_any_alias(inode); |
| |
| if (dentry && ceph_dentry(dentry) && |
| ceph_test_mount_opt(ceph_sb_to_client(dentry->d_sb), DCACHE)) { |
| dout(" marking %p (%p) complete\n", inode, dentry); |
| set_bit(CEPH_D_COMPLETE, &ceph_dentry(dentry)->flags); |
| } |
| dput(dentry); |
| } |
| |
| void ceph_dir_clear_complete(struct inode *inode) |
| { |
| struct dentry *dentry = d_find_any_alias(inode); |
| |
| if (dentry && ceph_dentry(dentry)) { |
| dout(" marking %p (%p) complete\n", inode, dentry); |
| set_bit(CEPH_D_COMPLETE, &ceph_dentry(dentry)->flags); |
| } |
| dput(dentry); |
| } |
| |
| bool ceph_dir_test_complete(struct inode *inode) |
| { |
| struct dentry *dentry = d_find_any_alias(inode); |
| |
| if (dentry && ceph_dentry(dentry)) { |
| dout(" marking %p (%p) NOT complete\n", inode, dentry); |
| clear_bit(CEPH_D_COMPLETE, &ceph_dentry(dentry)->flags); |
| } |
| dput(dentry); |
| return false; |
| } |
| |
| /* |
| * 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_dentry_info *di; |
| |
| dout("ceph_d_prune %p\n", dentry); |
| |
| /* do we have a valid parent? */ |
| if (!dentry->d_parent || IS_ROOT(dentry)) |
| return; |
| |
| /* if we are not hashed, we don't affect D_COMPLETE */ |
| if (d_unhashed(dentry)) |
| return; |
| |
| /* |
| * we hold d_lock, so d_parent is stable, and d_fsdata is never |
| * cleared until d_release |
| */ |
| di = ceph_dentry(dentry->d_parent); |
| clear_bit(CEPH_D_COMPLETE, &di->flags); |
| } |
| |
| /* |
| * 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_file_info *cf = file->private_data; |
| struct inode *inode = file->f_dentry->d_inode; |
| 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 (!cf->dir_info) { |
| cf->dir_info = kmalloc(bufsize, GFP_NOFS); |
| if (!cf->dir_info) |
| return -ENOMEM; |
| cf->dir_info_len = |
| snprintf(cf->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: %10ld.%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, |
| (long)ci->i_rctime.tv_sec, |
| (long)ci->i_rctime.tv_nsec); |
| } |
| |
| if (*ppos >= cf->dir_info_len) |
| return 0; |
| size = min_t(unsigned, size, cf->dir_info_len-*ppos); |
| left = copy_to_user(buf, cf->dir_info + *ppos, size); |
| if (left == size) |
| return -EFAULT; |
| *ppos += (size - left); |
| return size - left; |
| } |
| |
| /* |
| * an fsync() on a dir will wait for any uncommitted directory |
| * operations to commit. |
| */ |
| static int ceph_dir_fsync(struct file *file, loff_t start, loff_t end, |
| int datasync) |
| { |
| struct inode *inode = file->f_path.dentry->d_inode; |
| struct ceph_inode_info *ci = ceph_inode(inode); |
| struct list_head *head = &ci->i_unsafe_dirops; |
| struct ceph_mds_request *req; |
| u64 last_tid; |
| int ret = 0; |
| |
| dout("dir_fsync %p\n", inode); |
| ret = filemap_write_and_wait_range(inode->i_mapping, start, end); |
| if (ret) |
| return ret; |
| mutex_lock(&inode->i_mutex); |
| |
| spin_lock(&ci->i_unsafe_lock); |
| if (list_empty(head)) |
| goto out; |
| |
| req = list_entry(head->prev, |
| struct ceph_mds_request, r_unsafe_dir_item); |
| last_tid = req->r_tid; |
| |
| do { |
| ceph_mdsc_get_request(req); |
| spin_unlock(&ci->i_unsafe_lock); |
| |
| dout("dir_fsync %p wait on tid %llu (until %llu)\n", |
| inode, req->r_tid, last_tid); |
| if (req->r_timeout) { |
| ret = wait_for_completion_timeout( |
| &req->r_safe_completion, req->r_timeout); |
| if (ret > 0) |
| ret = 0; |
| else if (ret == 0) |
| ret = -EIO; /* timed out */ |
| } else { |
| wait_for_completion(&req->r_safe_completion); |
| } |
| ceph_mdsc_put_request(req); |
| |
| spin_lock(&ci->i_unsafe_lock); |
| if (ret || list_empty(head)) |
| break; |
| req = list_entry(head->next, |
| struct ceph_mds_request, r_unsafe_dir_item); |
| } while (req->r_tid < last_tid); |
| out: |
| spin_unlock(&ci->i_unsafe_lock); |
| mutex_unlock(&inode->i_mutex); |
| |
| return ret; |
| } |
| |
| /* |
| * We maintain a private dentry LRU. |
| * |
| * FIXME: this needs to be changed to a per-mds lru to be useful. |
| */ |
| void ceph_dentry_lru_add(struct dentry *dn) |
| { |
| struct ceph_dentry_info *di = ceph_dentry(dn); |
| struct ceph_mds_client *mdsc; |
| |
| dout("dentry_lru_add %p %p '%.*s'\n", di, dn, |
| dn->d_name.len, dn->d_name.name); |
| mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
| spin_lock(&mdsc->dentry_lru_lock); |
| list_add_tail(&di->lru, &mdsc->dentry_lru); |
| mdsc->num_dentry++; |
| spin_unlock(&mdsc->dentry_lru_lock); |
| } |
| |
| void ceph_dentry_lru_touch(struct dentry *dn) |
| { |
| struct ceph_dentry_info *di = ceph_dentry(dn); |
| struct ceph_mds_client *mdsc; |
| |
| dout("dentry_lru_touch %p %p '%.*s' (offset %lld)\n", di, dn, |
| dn->d_name.len, dn->d_name.name, di->offset); |
| mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
| spin_lock(&mdsc->dentry_lru_lock); |
| list_move_tail(&di->lru, &mdsc->dentry_lru); |
| spin_unlock(&mdsc->dentry_lru_lock); |
| } |
| |
| void ceph_dentry_lru_del(struct dentry *dn) |
| { |
| struct ceph_dentry_info *di = ceph_dentry(dn); |
| struct ceph_mds_client *mdsc; |
| |
| dout("dentry_lru_del %p %p '%.*s'\n", di, dn, |
| dn->d_name.len, dn->d_name.name); |
| mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
| spin_lock(&mdsc->dentry_lru_lock); |
| list_del_init(&di->lru); |
| mdsc->num_dentry--; |
| spin_unlock(&mdsc->dentry_lru_lock); |
| } |
| |
| /* |
| * 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); |
| |
| switch (dci->i_dir_layout.dl_dir_hash) { |
| case 0: /* for backward compat */ |
| case CEPH_STR_HASH_LINUX: |
| return dn->d_name.hash; |
| |
| default: |
| return ceph_str_hash(dci->i_dir_layout.dl_dir_hash, |
| dn->d_name.name, dn->d_name.len); |
| } |
| } |
| |
| const struct file_operations ceph_dir_fops = { |
| .read = ceph_read_dir, |
| .readdir = ceph_readdir, |
| .llseek = ceph_dir_llseek, |
| .open = ceph_open, |
| .release = ceph_release, |
| .unlocked_ioctl = ceph_ioctl, |
| .fsync = ceph_dir_fsync, |
| }; |
| |
| const struct inode_operations ceph_dir_iops = { |
| .lookup = ceph_lookup, |
| .permission = ceph_permission, |
| .getattr = ceph_getattr, |
| .setattr = ceph_setattr, |
| .setxattr = ceph_setxattr, |
| .getxattr = ceph_getxattr, |
| .listxattr = ceph_listxattr, |
| .removexattr = ceph_removexattr, |
| .mknod = ceph_mknod, |
| .symlink = ceph_symlink, |
| .mkdir = ceph_mkdir, |
| .link = ceph_link, |
| .unlink = ceph_unlink, |
| .rmdir = ceph_unlink, |
| .rename = ceph_rename, |
| .create = ceph_create, |
| }; |
| |
| const struct dentry_operations ceph_dentry_ops = { |
| .d_revalidate = ceph_d_revalidate, |
| .d_release = ceph_d_release, |
| .d_prune = ceph_d_prune, |
| }; |
| |
| const struct dentry_operations ceph_snapdir_dentry_ops = { |
| .d_revalidate = ceph_snapdir_d_revalidate, |
| .d_release = ceph_d_release, |
| }; |
| |
| const struct dentry_operations ceph_snap_dentry_ops = { |
| .d_release = ceph_d_release, |
| .d_prune = ceph_d_prune, |
| }; |