[PATCH v6 02/20] vfs: make fstatat retry on ESTALE errors from getattr call

From: Jeff Layton
Date: Fri Sep 07 2012 - 10:25:17 EST


Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
---
fs/stat.c | 16 ++++++++++------
1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/fs/stat.c b/fs/stat.c
index b6ff118..d90258d 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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/