diff options
| author | Sage Weil <sage@newdream.net> | 2010-10-29 23:46:43 +0400 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2010-10-30 05:42:10 +0400 |
| commit | 4260f7c7516f4c209cf0ca34fda99cc9a0847772 (patch) | |
| tree | 7feb5ab81d074b17a7c5b12bcc019c2e1bb010e2 /fs/btrfs/super.c | |
| parent | 531cb13f1e417c060b54f979e1659ecd69bea650 (diff) | |
| download | linux-4260f7c7516f4c209cf0ca34fda99cc9a0847772.tar.xz | |
Btrfs: allow subvol deletion by unprivileged user with -o user_subvol_rm_allowed
Add a mount option user_subvol_rm_allowed that allows users to delete a
(potentially non-empty!) subvol when they would otherwise we allowed to do
an rmdir(2). We duplicate the may_delete() checks from the core VFS code
to implement identical security checks (minus the directory size check).
We additionally require that the user has write+exec permission on the
subvol root inode.
Signed-off-by: Sage Weil <sage@newdream.net>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/super.c')
| -rw-r--r-- | fs/btrfs/super.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 0002e6d1a16f..718b10de2049 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -71,6 +71,7 @@ enum { Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress, Opt_compress_force, Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard, Opt_space_cache, Opt_clear_cache, Opt_err, + Opt_user_subvol_rm_allowed, }; static match_table_t tokens = { @@ -96,6 +97,7 @@ static match_table_t tokens = { {Opt_discard, "discard"}, {Opt_space_cache, "space_cache"}, {Opt_clear_cache, "clear_cache"}, + {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"}, {Opt_err, NULL}, }; @@ -246,6 +248,9 @@ int btrfs_parse_options(struct btrfs_root *root, char *options) printk(KERN_INFO "btrfs: force clearing of disk cache\n"); btrfs_set_opt(info->mount_opt, CLEAR_CACHE); break; + case Opt_user_subvol_rm_allowed: + btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); + break; case Opt_err: printk(KERN_INFO "btrfs: unrecognized mount option " "'%s'\n", p); |