diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/ceph/dir.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/ceph/dir.c | 1376 |
1 files changed, 0 insertions, 1376 deletions
diff --git a/ANDROID_3.4.5/fs/ceph/dir.c b/ANDROID_3.4.5/fs/ceph/dir.c deleted file mode 100644 index 3e8094be..00000000 --- a/ANDROID_3.4.5/fs/ceph/dir.c +++ /dev/null @@ -1,1376 +0,0 @@ -#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, -}; |