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author | Sage Weil <sage@newdream.net> | 2011-07-26 18:31:14 (GMT) |
---|---|---|
committer | Sage Weil <sage@newdream.net> | 2011-07-26 18:31:14 (GMT) |
commit | 41b02e1f9bb87b07d792b64aaeb7af3d00d69cd2 (patch) | |
tree | 87c9524ff96cbff2ff29d659cbefd516b553ca1f | |
parent | 4f1772645296a230e04f5c53e79cfb6f841ce634 (diff) | |
download | linux-41b02e1f9bb87b07d792b64aaeb7af3d00d69cd2.tar.xz |
ceph: explicitly reference rename old_dentry parent dir in request
We carry a pin on the parent directory for the rename source and dest
dentries. For the source it's r_locked_dir; we need to explicitly
reference the old_dentry parent as well, since the dentry's d_parent may
change between when the request was created and pinned and when it is
freed.
Reviewed-by: Yehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>
-rw-r--r-- | fs/ceph/debugfs.c | 2 | ||||
-rw-r--r-- | fs/ceph/dir.c | 2 | ||||
-rw-r--r-- | fs/ceph/mds_client.c | 23 | ||||
-rw-r--r-- | fs/ceph/mds_client.h | 1 |
4 files changed, 17 insertions, 11 deletions
diff --git a/fs/ceph/debugfs.c b/fs/ceph/debugfs.c index 0dba691..fb962ef 100644 --- a/fs/ceph/debugfs.c +++ b/fs/ceph/debugfs.c @@ -102,7 +102,7 @@ static int mdsc_show(struct seq_file *s, void *p) path = NULL; spin_lock(&req->r_old_dentry->d_lock); seq_printf(s, " #%llx/%.*s (%s)", - ceph_ino(req->r_old_dentry->d_parent->d_inode), + ceph_ino(req->r_old_dentry_dir), req->r_old_dentry->d_name.len, req->r_old_dentry->d_name.name, path ? path : ""); diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c index 33a19df..7263f82 100644 --- a/fs/ceph/dir.c +++ b/fs/ceph/dir.c @@ -811,6 +811,7 @@ 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; @@ -909,6 +910,7 @@ 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; diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c index 8a09cd5..66a8939 100644 --- a/fs/ceph/mds_client.c +++ b/fs/ceph/mds_client.c @@ -483,22 +483,26 @@ void ceph_mdsc_release_request(struct kref *kref) destroy_reply_info(&req->r_reply_info); } if (req->r_inode) { - ceph_put_cap_refs(ceph_inode(req->r_inode), - CEPH_CAP_PIN); + ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN); iput(req->r_inode); } if (req->r_locked_dir) - ceph_put_cap_refs(ceph_inode(req->r_locked_dir), - CEPH_CAP_PIN); + ceph_put_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN); if (req->r_target_inode) iput(req->r_target_inode); if (req->r_dentry) dput(req->r_dentry); if (req->r_old_dentry) { - ceph_put_cap_refs( - ceph_inode(req->r_old_dentry->d_parent->d_inode), - CEPH_CAP_PIN); + /* + * track (and drop pins for) r_old_dentry_dir + * separately, since r_old_dentry's d_parent may have + * changed between the dir mutex being dropped and + * this request being freed. + */ + ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir), + CEPH_CAP_PIN); dput(req->r_old_dentry); + iput(req->r_old_dentry_dir); } kfree(req->r_path1); kfree(req->r_path2); @@ -1931,9 +1935,8 @@ int ceph_mdsc_do_request(struct ceph_mds_client *mdsc, if (req->r_locked_dir) ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN); if (req->r_old_dentry) - ceph_get_cap_refs( - ceph_inode(req->r_old_dentry->d_parent->d_inode), - CEPH_CAP_PIN); + ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir), + CEPH_CAP_PIN); /* issue */ mutex_lock(&mdsc->mutex); diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h index 8a40f06..4bb2399 100644 --- a/fs/ceph/mds_client.h +++ b/fs/ceph/mds_client.h @@ -171,6 +171,7 @@ struct ceph_mds_request { struct inode *r_inode; /* arg1 */ struct dentry *r_dentry; /* arg1 */ struct dentry *r_old_dentry; /* arg2: rename from or link from */ + struct inode *r_old_dentry_dir; /* arg2: old dentry's parent dir */ char *r_path1, *r_path2; struct ceph_vino r_ino1, r_ino2; |