#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, 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; int err; if (ceph_snap(dir) != CEPH_NOSNAP) return -EROFS; 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)) { 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, umode_t 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, 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; 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%ho\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 = S_ISDIR(dentry->d_inode->i_mode) ? 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_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 = 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, };