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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2011-03-08 16:39:46 +0530
committerEric Van Hensbergen <ericvh@gmail.com>2011-03-22 15:43:35 -0500
commit5a7e0a8cf50cf905403f5a498e86d1f97cfcf51b (patch)
tree3f20f98db76f7a221f397630a03e6089c1208510 /fs/9p/vfs_file.c
parentf741a79e982cf56d7584435bad663553ffe6715f (diff)
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.c3
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);