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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: 4edb83bb10 ("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>
This commit is contained in:
Amir Goldstein 2018-01-03 18:54:42 +02:00 committed by Miklos Szeredi
parent 2ba9d57e65
commit a5a927a7c8
1 changed files with 9 additions and 2 deletions
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11
fs/overlayfs/readdir.c
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@ -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;