fs/9p: When doing inode lookup compare qid details and inode mode bits.
This make sure we don't use wrong inode from the inode hash. The inode number
of the file deleted is reused by the next file system object created
and if we only use inode number for inode hash lookup we could end up
with wrong struct inode.
Also compare inode generation number. Not all Linux file system provide
st_gen in userspace. So it could be 0;
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
diff --git a/fs/9p/vfs_inode_dotl.c b/fs/9p/vfs_inode_dotl.c
index 32bbbe5..dc9e7de 100644
--- a/fs/9p/vfs_inode_dotl.c
+++ b/fs/9p/vfs_inode_dotl.c
@@ -86,6 +86,38 @@
return dentry;
}
+static int v9fs_test_inode_dotl(struct inode *inode, void *data)
+{
+ struct v9fs_inode *v9inode = V9FS_I(inode);
+ struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
+
+ /* don't match inode of different type */
+ if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
+ return 0;
+
+ if (inode->i_generation != st->st_gen)
+ return 0;
+
+ /* compare qid details */
+ if (memcmp(&v9inode->qid.version,
+ &st->qid.version, sizeof(v9inode->qid.version)))
+ return 0;
+
+ if (v9inode->qid.type != st->qid.type)
+ return 0;
+ return 1;
+}
+
+static int v9fs_set_inode_dotl(struct inode *inode, void *data)
+{
+ struct v9fs_inode *v9inode = V9FS_I(inode);
+ struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
+
+ memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
+ inode->i_generation = st->st_gen;
+ return 0;
+}
+
static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
struct p9_qid *qid,
struct p9_fid *fid,
@@ -97,7 +129,8 @@
struct v9fs_session_info *v9ses = sb->s_fs_info;
i_ino = v9fs_qid2ino(qid);
- inode = iget_locked(sb, i_ino);
+ inode = iget5_locked(sb, i_ino, v9fs_test_inode_dotl,
+ v9fs_set_inode_dotl, st);
if (!inode)
return ERR_PTR(-ENOMEM);
if (!(inode->i_state & I_NEW))
@@ -107,13 +140,13 @@
* FIXME!! we may need support for stale inodes
* later.
*/
+ inode->i_ino = i_ino;
retval = v9fs_init_inode(v9ses, inode, st->st_mode);
if (retval)
goto error;
v9fs_stat2inode_dotl(st, inode);
#ifdef CONFIG_9P_FSCACHE
- v9fs_fscache_set_key(inode, &st->qid);
v9fs_cache_inode_get_cookie(inode);
#endif
retval = v9fs_get_acl(inode, fid);
@@ -136,7 +169,7 @@
struct p9_stat_dotl *st;
struct inode *inode = NULL;
- st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
+ st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
if (IS_ERR(st))
return ERR_CAST(st);
@@ -547,7 +580,7 @@
inode->i_blocks = stat->st_blocks;
}
if (stat->st_result_mask & P9_STATS_GEN)
- inode->i_generation = stat->st_gen;
+ inode->i_generation = stat->st_gen;
/* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
* because the inode structure does not have fields for them.