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| author | Sage Weil <sage@newdream.net> | 2011-07-26 22:30:29 +0400 |
|---|---|---|
| committer | Sage Weil <sage@newdream.net> | 2011-07-26 22:30:29 +0400 |
| commit | 5f21c96dd5c615341963036ae8f5e4f5227a818d (patch) | |
| tree | 898c5781623b68527427d201e3f975827d08935c /fs/ceph/super.h | |
| parent | 48d0cbd1242aac969560ef8b90f26ee3b09a6a5c (diff) | |
| download | linux-5f21c96dd5c615341963036ae8f5e4f5227a818d.tar.xz | |
ceph: protect access to d_parent
d_parent is protected by d_lock: use it when looking up a dentry's parent
directory inode. Also take a reference and drop it in the caller to avoid
a use-after-free.
Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Reviewed-by: Yehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>
Diffstat (limited to 'fs/ceph/super.h')
| -rw-r--r-- | fs/ceph/super.h | 9 |
1 files changed, 1 insertions, 8 deletions
diff --git a/fs/ceph/super.h b/fs/ceph/super.h index c24891a5bec2..c1eb9a014b74 100644 --- a/fs/ceph/super.h +++ b/fs/ceph/super.h @@ -801,6 +801,7 @@ extern void ceph_dentry_lru_touch(struct dentry *dn); extern void ceph_dentry_lru_del(struct dentry *dn); extern void ceph_invalidate_dentry_lease(struct dentry *dentry); extern unsigned ceph_dentry_hash(struct dentry *dn); +extern struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry); /* * our d_ops vary depending on whether the inode is live, @@ -823,14 +824,6 @@ extern int ceph_encode_locks(struct inode *i, struct ceph_pagelist *p, int p_locks, int f_locks); extern int lock_to_ceph_filelock(struct file_lock *fl, struct ceph_filelock *c); -static inline struct inode *get_dentry_parent_inode(struct dentry *dentry) -{ - if (dentry && dentry->d_parent) - return dentry->d_parent->d_inode; - - return NULL; -} - /* debugfs.c */ extern int ceph_fs_debugfs_init(struct ceph_fs_client *client); extern void ceph_fs_debugfs_cleanup(struct ceph_fs_client *client); |