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eCryptfs: Fix new inode race condition

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Only unlock and d_add() new inodes after the plaintext inode size has
been read from the lower filesystem. This fixes a race condition that
was sometimes seen during a multi-job kernel build in an eCryptfs mount.

https://bugzilla.kernel.org/show_bug.cgi?id=36002

Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
Reported-by: David <david@unsolicited.net>
Tested-by: David <david@unsolicited.net>
This commit is contained in:
Tyler Hicks
2011-05-24 03:49:02 -05:00
parent 5ccf92037c
commit 3b06b3ebf4
5 changed files with 30 additions and 28 deletions
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6
fs/ecryptfs/main.c
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@@ -135,12 +135,12 @@ static int ecryptfs_init_lower_file(struct dentry *dentry,
return rc;
}
int ecryptfs_get_lower_file(struct dentry *dentry)
int ecryptfs_get_lower_file(struct dentry *dentry, struct inode *inode)
{
struct ecryptfs_inode_info *inode_info =
ecryptfs_inode_to_private(dentry->d_inode);
struct ecryptfs_inode_info *inode_info;
int count, rc = 0;
inode_info = ecryptfs_inode_to_private(inode);
mutex_lock(&inode_info->lower_file_mutex);
count = atomic_inc_return(&inode_info->lower_file_count);
if (WARN_ON_ONCE(count < 1))