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| author |   Amir Goldstein <amir73il@gmail.com> | 2017-05-17 00:12:40 +0300 |
|---|---|---|
| committer |   Miklos Szeredi <mszeredi@redhat.com> | 2017-05-18 16:11:24 +0200 |
| commit | 82b749b2c65e9d108c1c5598dc0a5f436b525f42 (patch) | |
| tree | 64b5d467ac3acc5f4d7f2776caac37e89ad35dea /fs/overlayfs/super.c | |
| parent | ovl: fix creds leak in copy up error path (diff) | |
| download | linux-dev-82b749b2c65e9d108c1c5598dc0a5f436b525f42.tar.xz linux-dev-82b749b2c65e9d108c1c5598dc0a5f436b525f42.zip | |
ovl: check on mount time if upper fs supports setting xattr
xattr are needed by overlayfs for setting opaque dir, redirect dir
and copy up origin.
Check at mount time by trying to set the overlay.opaque xattr on the
workdir and if that fails issue a warning message.
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/overlayfs/super.c')
| -rw-r--r-- | fs/overlayfs/super.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c index 9828b7de8999..f1647626a882 100644 --- a/fs/overlayfs/super.c +++ b/fs/overlayfs/super.c @@ -891,6 +891,19 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent) dput(temp); else pr_warn("overlayfs: upper fs does not support tmpfile.\n"); + + /* + * Check if upper/work fs supports trusted.overlay.* + * xattr + */ + err = ovl_do_setxattr(ufs->workdir, OVL_XATTR_OPAQUE, + "0", 1, 0); + if (err) { + ufs->noxattr = true; + pr_warn("overlayfs: upper fs does not support xattr.\n"); + } else { + vfs_removexattr(ufs->workdir, OVL_XATTR_OPAQUE); + } } } |