[PATCH v7 22/49] vfs: make fstatat retry on ESTALE errors from getattr call

Jeff Layton
2012-10-02T00:17:37Z

fs/stat.c | 16 ++++++++++------
1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/fs/stat.c b/fs/stat.c
index 4078022..7f1602a 100644
--- a/fs/stat.c
+++ b/fs/stat.c
@@ -74,7 +74,8 @@ int vfs_fstatat(int dfd, const char __user *filename, struct kstat *stat,
{
struct path path;
int error = -EINVAL;
- int lookup_flags = 0;
+ unsigned int try = 0;
+ unsigned int lookup_flags = 0;

if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT |
AT_EMPTY_PATH)) != 0)
@@ -85,12 +86,15 @@ int vfs_fstatat(int dfd, const char __user *filename, struct kstat *stat,
if (flag & AT_EMPTY_PATH)
lookup_flags |= LOOKUP_EMPTY;

- error = user_path_at(dfd, filename, lookup_flags, &path);
- if (error)
- goto out;
+ do {
+ error = user_path_at(dfd, filename, lookup_flags, &path);
+ if (error)
+ break;

- error = vfs_getattr(path.mnt, path.dentry, stat);
- path_put(&path);
+ error = vfs_getattr(path.mnt, path.dentry, stat);
+ path_put(&path);
+ lookup_flags |= LOOKUP_REVAL;
+ } while (retry_estale(error, try++));
out:
return error;
}
--
1.7.11.4