diff options
| author | piaojun <piaojun@huawei.com> | 2018-07-25 05:13:16 +0200 |
|---|---|---|
| committer | Dominique Martinet <dominique.martinet@cea.fr> | 2018-08-13 02:35:16 +0200 |
| commit | 3111784bee81591ea2815011688d28b65df03627 (patch) | |
| tree | 049732d6fcb3828679f712e35305d4d3752bd374 /fs/9p | |
| parent | 9p: validate PDU length (diff) | |
| download | linux-3111784bee81591ea2815011688d28b65df03627.tar.xz linux-3111784bee81591ea2815011688d28b65df03627.zip | |
fs/9p/xattr.c: catch the error of p9_client_clunk when setting xattr failed
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>
Diffstat (limited to 'fs/9p')
| -rw-r--r-- | fs/9p/xattr.c | 6 |
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; } |