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| author | Amir Goldstein <amir73il@gmail.com> | 2018-01-03 18:54:42 +0200 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@redhat.com> | 2018-01-19 17:43:24 +0100 |
| commit | a5a927a7c82e28ea76599dee4019c41e372c911f (patch) | |
| tree | bafff47b89c2e07707dc6f4764d50f7292883989 | |
| parent | 2ba9d57e65044859f7ff133bcb0a902769bf3bc6 (diff) | |
| download | linux-a5a927a7c82e28ea76599dee4019c41e372c911f.tar.bz2 | |
ovl: take mnt_want_write() for removing impure xattr
The optimization in ovl_cache_get_impure() that tries to remove an
unneeded "impure" xattr needs to take mnt_want_write() on upper fs.
Fixes: 4edb83bb1041 ("ovl: constant d_ino for non-merge dirs")
Cc: <stable@vger.kernel.org> #v4.14
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
| -rw-r--r-- | fs/overlayfs/readdir.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/fs/overlayfs/readdir.c b/fs/overlayfs/readdir.c index 7dfe381c2cd8..1a8c39887992 100644 --- a/fs/overlayfs/readdir.c +++ b/fs/overlayfs/readdir.c @@ -593,8 +593,15 @@ static struct ovl_dir_cache *ovl_cache_get_impure(struct path *path) return ERR_PTR(res); } if (list_empty(&cache->entries)) { - /* Good oportunity to get rid of an unnecessary "impure" flag */ - ovl_do_removexattr(ovl_dentry_upper(dentry), OVL_XATTR_IMPURE); + /* + * A good opportunity to get rid of an unneeded "impure" flag. + * Removing the "impure" xattr is best effort. + */ + if (!ovl_want_write(dentry)) { + ovl_do_removexattr(ovl_dentry_upper(dentry), + OVL_XATTR_IMPURE); + ovl_drop_write(dentry); + } ovl_clear_flag(OVL_IMPURE, d_inode(dentry)); kfree(cache); return NULL; |