aboutsummaryrefslogtreecommitdiffstats
path: root/fs/ceph/dir.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2011-07-26 13:38:50 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-07-26 13:38:50 -0700
commitba5b56cb3e3d2cab73d4fee9a022bb69462a8cd9 (patch)
treeeda7ea059a41ae5d68e2ad5a36a87069187ef22a /fs/ceph/dir.c
parent243dd2809a5edd2e0e3e62781083aa44049af37d (diff)
parentd79698da32b317e96216236f265a9b72b78ae568 (diff)
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client: (23 commits) ceph: document unlocked d_parent accesses ceph: explicitly reference rename old_dentry parent dir in request ceph: document locking for ceph_set_dentry_offset ceph: avoid d_parent in ceph_dentry_hash; fix ceph_encode_fh() hashing bug ceph: protect d_parent access in ceph_d_revalidate ceph: protect access to d_parent ceph: handle racing calls to ceph_init_dentry ceph: set dir complete frag after adding capability rbd: set blk_queue request sizes to object size ceph: set up readahead size when rsize is not passed rbd: cancel watch request when releasing the device ceph: ignore lease mask ceph: fix ceph_lookup_open intent usage ceph: only link open operations to directory unsafe list if O_CREAT|O_TRUNC ceph: fix bad parent_inode calc in ceph_lookup_open ceph: avoid carrying Fw cap during write into page cache libceph: don't time out osd requests that haven't been received ceph: report f_bfree based on kb_avail rather than diffing. ceph: only queue capsnap if caps are dirty ceph: fix snap writeback when racing with writes ...
Diffstat (limited to 'fs/ceph/dir.c')
-rw-r--r--fs/ceph/dir.c116
1 files changed, 73 insertions, 43 deletions
diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index 1065ac77984..382abc9a6a5 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -40,14 +40,6 @@ int ceph_init_dentry(struct dentry *dentry)
if (dentry->d_fsdata)
return 0;
- 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 = kmem_cache_alloc(ceph_dentry_cachep, GFP_NOFS | __GFP_ZERO);
if (!di)
return -ENOMEM; /* oh well */
@@ -58,16 +50,42 @@ int ceph_init_dentry(struct dentry *dentry)
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_fsdata = di;
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;
+}
/*
@@ -133,7 +151,7 @@ more:
d_unhashed(dentry) ? "!hashed" : "hashed",
parent->d_subdirs.prev, parent->d_subdirs.next);
if (p == &parent->d_subdirs) {
- fi->at_end = 1;
+ fi->flags |= CEPH_F_ATEND;
goto out_unlock;
}
spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);
@@ -234,7 +252,7 @@ static int ceph_readdir(struct file *filp, void *dirent, filldir_t filldir)
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->at_end)
+ if (fi->flags & CEPH_F_ATEND)
return 0;
/* always start with . and .. */
@@ -403,7 +421,7 @@ more:
dout("readdir next frag is %x\n", frag);
goto more;
}
- fi->at_end = 1;
+ fi->flags |= CEPH_F_ATEND;
/*
* if dir_release_count still matches the dir, no dentries
@@ -435,7 +453,7 @@ static void reset_readdir(struct ceph_file_info *fi)
dput(fi->dentry);
fi->dentry = NULL;
}
- fi->at_end = 0;
+ fi->flags &= ~CEPH_F_ATEND;
}
static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int origin)
@@ -463,7 +481,7 @@ static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int origin)
if (offset != file->f_pos) {
file->f_pos = offset;
file->f_version = 0;
- fi->at_end = 0;
+ fi->flags &= ~CEPH_F_ATEND;
}
retval = offset;
@@ -488,21 +506,13 @@ out:
}
/*
- * Process 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).
+ * Handle lookups for the hidden .snap directory.
*/
-struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
- struct dentry *dentry, int err)
+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;
+ struct inode *parent = dentry->d_parent->d_inode; /* we hold i_mutex */
/* .snap dir? */
if (err == -ENOENT &&
@@ -516,7 +526,23 @@ struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
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;
@@ -610,6 +636,7 @@ static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
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);
@@ -789,6 +816,7 @@ static int ceph_link(struct dentry *old_dentry, struct inode *dir,
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;
@@ -887,6 +915,7 @@ static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry,
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;
@@ -1002,36 +1031,38 @@ static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry)
*/
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;
- dir = dentry->d_parent->d_inode;
-
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);
- goto out_touch;
+ 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;
}
- if (dentry->d_inode && ceph_snap(dentry->d_inode) == CEPH_SNAPDIR)
- goto out_touch;
-
- if (dentry_lease_is_valid(dentry) ||
- dir_lease_is_valid(dir, dentry))
- goto out_touch;
- dout("d_revalidate %p invalid\n", dentry);
- d_drop(dentry);
- return 0;
-out_touch:
- ceph_dentry_lru_touch(dentry);
- return 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;
}
/*
@@ -1228,9 +1259,8 @@ void ceph_dentry_lru_del(struct dentry *dn)
* Return name hash for a given dentry. This is dependent on
* the parent directory's hash function.
*/
-unsigned ceph_dentry_hash(struct dentry *dn)
+unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn)
{
- struct inode *dir = dn->d_parent->d_inode;
struct ceph_inode_info *dci = ceph_inode(dir);
switch (dci->i_dir_layout.dl_dir_hash) {