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authorpiaojun <piaojun@huawei.com>2018-07-25 06:13:16 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-09-09 20:55:55 +0300
commit4827a583871a225cfce62a52d779e2a31f310925 (patch)
treeb0a1a728244c905c2013ccbbbbc8d5a481e44748 /fs
parent390671089d6214542fb8bd8e2f7700647c18017f (diff)
downloadlinux-4827a583871a225cfce62a52d779e2a31f310925.tar.xz
fs/9p/xattr.c: catch the error of p9_client_clunk when setting xattr failed
commit 3111784bee81591ea2815011688d28b65df03627 upstream. In my testing, v9fs_fid_xattr_set will return successfully even if the backend ext4 filesystem has no space to store xattr key-value. That will cause inconsistent behavior between front end and back end. The reason is that lsetxattr will be triggered by p9_client_clunk, and unfortunately we did not catch the error. This patch will catch the error to notify upper caller. p9_client_clunk (in 9p) p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); v9fs_clunk (in qemu) put_fid free_fid v9fs_xattr_fid_clunk v9fs_co_lsetxattr s->ops->lsetxattr ext4_xattr_user_set (in host ext4 filesystem) Link: http://lkml.kernel.org/r/5B57EACC.2060900@huawei.com Signed-off-by: Jun Piao <piaojun@huawei.com> Cc: Eric Van Hensbergen <ericvh@gmail.com> Cc: Ron Minnich <rminnich@sandia.gov> Cc: Latchesar Ionkov <lucho@ionkov.net> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: stable@vger.kernel.org Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/9p/xattr.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/9p/xattr.c b/fs/9p/xattr.c
index f329eee6dc93..352abc39e891 100644
--- a/fs/9p/xattr.c
+++ b/fs/9p/xattr.c
@@ -105,7 +105,7 @@ int v9fs_fid_xattr_set(struct p9_fid *fid, const char *name,
{
struct kvec kvec = {.iov_base = (void *)value, .iov_len = value_len};
struct iov_iter from;
- int retval;
+ int retval, err;
iov_iter_kvec(&from, WRITE | ITER_KVEC, &kvec, 1, value_len);
@@ -126,7 +126,9 @@ int v9fs_fid_xattr_set(struct p9_fid *fid, const char *name,
retval);
else
p9_client_write(fid, 0, &from, &retval);
- p9_client_clunk(fid);
+ err = p9_client_clunk(fid);
+ if (!retval && err)
+ retval = err;
return retval;
}