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| author | Jeff Layton <jlayton@kernel.org> | 2019-04-17 19:58:28 +0300 |
|---|---|---|
| committer | Ilya Dryomov <idryomov@gmail.com> | 2019-04-23 22:37:54 +0300 |
| commit | 76a495d666e5043ffc315695f8241f5e94a98849 (patch) | |
| tree | 93ace9f5486aa96bdf96cb120f97806592946da0 | |
| parent | 1bcb344086f3ecf8d6705f6d708441baa823beb3 (diff) | |
| download | linux-76a495d666e5043ffc315695f8241f5e94a98849.tar.xz | |
ceph: ensure d_name stability in ceph_dentry_hash()
Take the d_lock here to ensure that d_name doesn't change.
Cc: stable@vger.kernel.org
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
| -rw-r--r-- | fs/ceph/dir.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c index a8f429882249..0637149fb9f9 100644 --- a/fs/ceph/dir.c +++ b/fs/ceph/dir.c @@ -1766,6 +1766,7 @@ static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size, unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn) { struct ceph_inode_info *dci = ceph_inode(dir); + unsigned hash; switch (dci->i_dir_layout.dl_dir_hash) { case 0: /* for backward compat */ @@ -1773,8 +1774,11 @@ unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn) return dn->d_name.hash; default: - return ceph_str_hash(dci->i_dir_layout.dl_dir_hash, + spin_lock(&dn->d_lock); + hash = ceph_str_hash(dci->i_dir_layout.dl_dir_hash, dn->d_name.name, dn->d_name.len); + spin_unlock(&dn->d_lock); + return hash; } } |