diff options
Diffstat (limited to 'kernel/fs/ceph/dir.c')
| -rw-r--r-- | kernel/fs/ceph/dir.c | 1411 |
1 files changed, 1411 insertions, 0 deletions
diff --git a/kernel/fs/ceph/dir.c b/kernel/fs/ceph/dir.c new file mode 100644 index 000000000..4248307fe --- /dev/null +++ b/kernel/fs/ceph/dir.c @@ -0,0 +1,1411 @@ +#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 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 (ceph_snap(d_inode(dentry->d_parent)) == CEPH_NOSNAP) + d_set_d_op(dentry, &ceph_dentry_ops); + else if (ceph_snap(d_inode(dentry->d_parent)) == 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 (!IS_ROOT(dentry)) { + inode = d_inode(dentry->d_parent); + 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; +} + +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)); +} + +/* + * 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, + u32 shared_gen) +{ + struct ceph_file_info *fi = file->private_data; + struct dentry *parent = file->f_path.dentry; + struct inode *dir = d_inode(parent); + 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 v%u at %llu (last %p)\n", + dir, shared_gen, ctx->pos, last); + + spin_lock(&parent->d_lock); + + /* start at beginning? */ + if (ctx->pos == 2 || last == NULL || + fpos_cmp(ctx->pos, ceph_dentry(last)->offset) < 0) { + 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_child.prev; + } + +more: + dentry = list_entry(p, struct dentry, 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 (di->lease_shared_gen == shared_gen && + !d_unhashed(dentry) && d_really_is_positive(dentry) && + ceph_snap(d_inode(dentry)) != CEPH_SNAPDIR && + ceph_ino(d_inode(dentry)) != CEPH_INO_CEPH && + fpos_cmp(ctx->pos, di->offset) <= 0) + break; + dout(" skipping %p %pd at %llu (%llu)%s%s\n", dentry, + dentry, di->offset, + ctx->pos, d_unhashed(dentry) ? " unhashed" : "", + !d_inode(dentry) ? " null" : ""); + spin_unlock(&dentry->d_lock); + p = p->prev; + dentry = list_entry(p, struct dentry, d_child); + di = ceph_dentry(dentry); + } + + dget_dlock(dentry); + spin_unlock(&dentry->d_lock); + spin_unlock(&parent->d_lock); + + /* make sure a dentry wasn't dropped while we didn't have parent lock */ + if (!ceph_dir_is_complete_ordered(dir)) { + dout(" lost dir complete on %p; falling back to mds\n", dir); + dput(dentry); + err = -EAGAIN; + goto out; + } + + dout(" %llu (%llu) dentry %p %pd %p\n", di->offset, ctx->pos, + dentry, dentry, d_inode(dentry)); + if (!dir_emit(ctx, dentry->d_name.name, + dentry->d_name.len, + ceph_translate_ino(dentry->d_sb, d_inode(dentry)->i_ino), + d_inode(dentry)->i_mode >> 12)) { + if (last) { + /* remember our position */ + fi->dentry = last; + fi->next_offset = fpos_off(di->offset); + } + dput(dentry); + return 0; + } + + ctx->pos = di->offset + 1; + + if (last) + dput(last); + last = dentry; + + 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 *file, struct dir_context *ctx) +{ + struct ceph_file_info *fi = file->private_data; + struct inode *inode = file_inode(file); + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_fs_client *fsc = ceph_inode_to_client(inode); + struct ceph_mds_client *mdsc = fsc->mdsc; + unsigned frag = fpos_frag(ctx->pos); + int off = fpos_off(ctx->pos); + int err; + u32 ftype; + struct ceph_mds_reply_info_parsed *rinfo; + + dout("readdir %p file %p frag %u off %u\n", inode, file, frag, off); + if (fi->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_translate_ino(inode->i_sb, inode->i_ino), + inode->i_mode >> 12)) + return 0; + ctx->pos = 1; + off = 1; + } + if (ctx->pos == 1) { + ino_t ino = parent_ino(file->f_path.dentry); + dout("readdir off 1 -> '..'\n"); + if (!dir_emit(ctx, "..", 2, + ceph_translate_ino(inode->i_sb, ino), + inode->i_mode >> 12)) + return 0; + ctx->pos = 2; + off = 2; + } + + /* can we use the dcache? */ + spin_lock(&ci->i_ceph_lock); + if ((ctx->pos == 2 || fi->dentry) && + 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(ci, CEPH_CAP_FILE_SHARED, 1)) { + u32 shared_gen = ci->i_shared_gen; + spin_unlock(&ci->i_ceph_lock); + err = __dcache_readdir(file, ctx, shared_gen); + if (err != -EAGAIN) + return err; + frag = fpos_frag(ctx->pos); + off = fpos_off(ctx->pos); + } 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 */ + + if (ctx->pos == 2) { + /* note dir version at start of readdir so we can tell + * if any dentries get dropped */ + fi->dir_release_count = atomic_read(&ci->i_release_count); + fi->dir_ordered_count = ci->i_ordered_count; + } + +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; + } + + 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); + 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; + req->r_direct_hash = ceph_frag_value(frag); + req->r_direct_is_hash = true; + if (fi->last_name) { + req->r_path2 = kstrdup(fi->last_name, GFP_NOFS); + if (!req->r_path2) { + ceph_mdsc_put_request(req); + return -ENOMEM; + } + } + req->r_readdir_offset = fi->next_offset; + req->r_args.readdir.frag = cpu_to_le32(frag); + + 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\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"); + /* preclude from marking dir complete */ + fi->dir_release_count--; + } + + /* note next offset and last dentry name */ + rinfo = &req->r_reply_info; + if (le32_to_cpu(rinfo->dir_dir->frag) != frag) { + frag = le32_to_cpu(rinfo->dir_dir->frag); + if (ceph_frag_is_leftmost(frag)) + fi->next_offset = 2; + else + fi->next_offset = 0; + off = fi->next_offset; + } + fi->frag = frag; + 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 { + 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); + + ctx->pos = ceph_make_fpos(frag, off); + while (off >= fi->offset && off - fi->offset < rinfo->dir_nr) { + 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, ctx->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 (!dir_emit(ctx, + rinfo->dir_dname[off - fi->offset], + rinfo->dir_dname_len[off - fi->offset], + ceph_translate_ino(inode->i_sb, ino), ftype)) { + dout("filldir stopping us...\n"); + return 0; + } + off++; + ctx->pos++; + } + + 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; + ctx->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 (atomic_read(&ci->i_release_count) == fi->dir_release_count) { + if (ci->i_ordered_count == fi->dir_ordered_count) + dout(" marking %p complete and ordered\n", inode); + else + dout(" marking %p complete\n", inode); + __ceph_dir_set_complete(ci, fi->dir_release_count, + fi->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_file_info *fi, unsigned frag) +{ + if (fi->last_readdir) { + ceph_mdsc_put_request(fi->last_readdir); + fi->last_readdir = NULL; + } + kfree(fi->last_name); + fi->last_name = NULL; + if (ceph_frag_is_leftmost(frag)) + fi->next_offset = 2; /* compensate for . and .. */ + else + fi->next_offset = 0; + 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 whence) +{ + struct ceph_file_info *fi = file->private_data; + struct inode *inode = file->f_mapping->host; + loff_t old_offset = ceph_make_fpos(fi->frag, fi->next_offset); + loff_t retval; + + mutex_lock(&inode->i_mutex); + retval = -EINVAL; + switch (whence) { + 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) { + 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) != fi->frag || + fpos_off(offset) < fi->offset) { + dout("dir_llseek dropping %p content\n", file); + reset_readdir(fi, fpos_frag(offset)); + } + + /* bump dir_release_count if we did a forward seek */ + if (fpos_cmp(offset, old_offset) > 0) + 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 = d_inode(dentry->d_parent); /* 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 '%pd', linking to snapdir %p\n", + dentry, dentry, 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, 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 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, + unsigned int flags) +{ + 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 '%pd'\n", + dir, dentry, dentry); + + if (dentry->d_name.len > NAME_MAX) + return ERR_PTR(-ENAMETOOLONG); + + err = ceph_init_dentry(dentry); + if (err < 0) + return ERR_PTR(err); + + /* 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 %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_test_mount_opt(fsc, DCACHE) && + __ceph_dir_is_complete(ci) && + (__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, 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 inode *dir, struct dentry *dentry, + umode_t 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; + struct ceph_acls_info acls = {}; + int err; + + if (ceph_snap(dir) != CEPH_NOSNAP) + return -EROFS; + + err = ceph_pre_init_acls(dir, &mode, &acls); + if (err < 0) + return err; + + 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_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; + if (acls.pagelist) { + req->r_pagelist = acls.pagelist; + acls.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), &acls); + else + d_drop(dentry); + ceph_release_acls_info(&acls); + return err; +} + +static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode, + bool excl) +{ + return ceph_mknod(dir, dentry, mode, 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)) { + err = PTR_ERR(req); + goto out; + } + req->r_path2 = kstrdup(dest, GFP_NOFS); + if (!req->r_path2) { + err = -ENOMEM; + ceph_mdsc_put_request(req); + goto out; + } + req->r_locked_dir = dir; + req->r_dentry = dget(dentry); + req->r_num_caps = 2; + 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) + d_drop(dentry); + return err; +} + +static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) +{ + struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); + struct ceph_mds_client *mdsc = fsc->mdsc; + struct ceph_mds_request *req; + struct ceph_acls_info acls = {}; + 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 '%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 { + goto out; + } + + mode |= S_IFDIR; + err = ceph_pre_init_acls(dir, &mode, &acls); + 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_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; + if (acls.pagelist) { + req->r_pagelist = acls.pagelist; + acls.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), &acls); + else + d_drop(dentry); + ceph_release_acls_info(&acls); + 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); + req->r_locked_dir = dir; + 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; + 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; +} + +/* + * 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 = d_inode(dentry); + 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 '%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; + 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 op = CEPH_MDS_OP_RENAME; + int err; + + 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; + } + 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_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 (d_really_is_positive(new_dentry)) + req->r_inode_drop = 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); + + /* ensure target dentry is invalidated, despite + rehashing bug in vfs_rename_dir */ + ceph_invalidate_dentry_lease(new_dentry); + + /* d_move screws up sibling dentries' offsets */ + ceph_dir_clear_complete(old_dir); + ceph_dir_clear_complete(new_dir); + + } + 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_gen_ttl_lock); + gen = s->s_cap_gen; + ttl = s->s_cap_ttl; + spin_unlock(&s->s_gen_ttl_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 = d_inode(dentry->d_parent); + 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, unsigned int flags) +{ + int valid = 0; + struct inode *dir; + + if (flags & LOOKUP_RCU) + return -ECHILD; + + dout("d_revalidate %p '%pd' inode %p offset %lld\n", dentry, + dentry, d_inode(dentry), 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 '%pd' inode %p is SNAPPED\n", dentry, + dentry, d_inode(dentry)); + valid = 1; + } else if (d_really_is_positive(dentry) && + ceph_snap(d_inode(dentry)) == CEPH_SNAPDIR) { + valid = 1; + } else if (dentry_lease_is_valid(dentry) || + dir_lease_is_valid(dir, dentry)) { + if (d_really_is_positive(dentry)) + valid = ceph_is_any_caps(d_inode(dentry)); + else + valid = 1; + } + + dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid"); + if (valid) { + ceph_dentry_lru_touch(dentry); + } else { + ceph_dir_clear_complete(dir); + } + 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, + unsigned int flags) +{ + /* + * Eventually, we'll want to revalidate snapped metadata + * too... probably... + */ + return 1; +} + +/* + * 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) +{ + dout("ceph_d_prune %p\n", dentry); + + /* do we have a valid parent? */ + if (IS_ROOT(dentry)) + return; + + /* if we are not hashed, we don't affect dir's completeness */ + if (d_unhashed(dentry)) + return; + + /* + * we hold d_lock, so d_parent is stable, and d_fsdata is never + * cleared until d_release + */ + ceph_dir_clear_complete(d_inode(dentry->d_parent)); +} + +/* + * 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_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 (!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_inode(file); + 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) { + unsigned long time_left = wait_for_completion_timeout( + &req->r_safe_completion, + req->r_timeout); + if (time_left > 0) + ret = 0; + else + 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 '%pd'\n", di, dn, dn); + 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 '%pd' (offset %lld)\n", di, dn, dn, + 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 '%pd'\n", di, dn, dn); + 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, + .iterate = ceph_readdir, + .llseek = ceph_dir_llseek, + .open = ceph_open, + .release = ceph_release, + .unlocked_ioctl = ceph_ioctl, + .fsync = ceph_dir_fsync, +}; + +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, + .setxattr = ceph_setxattr, + .getxattr = ceph_getxattr, + .listxattr = ceph_listxattr, + .removexattr = ceph_removexattr, + .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_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, +}; |