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| author |   Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2011-03-08 16:39:46 +0530 |
|---|---|---|
| committer |   Eric Van Hensbergen <ericvh@gmail.com> | 2011-03-22 15:43:35 -0500 |
| commit | 5a7e0a8cf50cf905403f5a498e86d1f97cfcf51b (patch) | |
| tree | 3f20f98db76f7a221f397630a03e6089c1208510 /fs/9p/vfs_file.c | |
| parent | Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse (diff) | |
| download | linux-dev-5a7e0a8cf50cf905403f5a498e86d1f97cfcf51b.tar.xz linux-dev-5a7e0a8cf50cf905403f5a498e86d1f97cfcf51b.zip | |
fs/9p: Fix race in initializing writeback fid
When two process open the same file we can end up with both of them
allocating the writeback_fid. Add a new mutex which can be used
for synchronizing v9fs_inode member values.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Diffstat (limited to 'fs/9p/vfs_file.c')
| -rw-r--r-- | fs/9p/vfs_file.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c index 78bcb97c3425..3337d58d0fc5 100644 --- a/fs/9p/vfs_file.c +++ b/fs/9p/vfs_file.c @@ -90,6 +90,7 @@ int v9fs_file_open(struct inode *inode, struct file *file) } file->private_data = fid; + mutex_lock(&v9inode->v_mutex); if (v9ses->cache && !v9inode->writeback_fid) { /* * clone a fid and add it to writeback_fid @@ -101,10 +102,12 @@ int v9fs_file_open(struct inode *inode, struct file *file) fid = v9fs_writeback_fid(file->f_path.dentry); if (IS_ERR(fid)) { err = PTR_ERR(fid); + mutex_unlock(&v9inode->v_mutex); goto out_error; } v9inode->writeback_fid = (void *) fid; } + mutex_unlock(&v9inode->v_mutex); #ifdef CONFIG_9P_FSCACHE if (v9ses->cache) v9fs_cache_inode_set_cookie(inode, file); |