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authorAl Viro <viro@zeniv.linux.org.uk>2019-05-13 12:57:22 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2019-05-25 18:00:02 -0400
commitc3aabf0780a506225b53bfe2b5177dd5dfec093d (patch)
tree95e0457725a49ae8849f4e17014de6871b78cac3 /fs/super.c
parent059338aae33165179352a26b58d815801072c87d (diff)
move mount_capable() further out
Call graph of vfs_get_tree(): vfs_fsconfig_locked() # neither kernmount, nor submount do_new_mount() # neither kernmount, nor submount fc_mount() afs_mntpt_do_automount() # submount mount_one_hugetlbfs() # kernmount pid_ns_prepare_proc() # kernmount mq_create_mount() # kernmount vfs_kern_mount() simple_pin_fs() # kernmount vfs_submount() # submount kern_mount() # kernmount init_mount_tree() btrfs_mount() nfs_do_root_mount() The first two need the check (unconditionally). init_mount_tree() is setting rootfs up; any capability checks make zero sense for that one. And btrfs_mount()/ nfs_do_root_mount() have the checks already done in their callers. IOW, we can shift mount_capable() handling into the two callers - one in the normal case of mount(2), another - in fsconfig(2) handling of FSCONFIG_CMD_CREATE. I.e. the syscalls that set a new filesystem up. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/super.c')
-rw-r--r--fs/super.c6
1 files changed, 0 insertions, 6 deletions
diff --git a/fs/super.c b/fs/super.c
index 2c38541cd89f..72b4a5afcfd6 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -1415,12 +1415,6 @@ int vfs_get_tree(struct fs_context *fc)
if (fc->root)
return -EBUSY;
- if (!(fc->sb_flags & SB_KERNMOUNT) &&
- fc->purpose != FS_CONTEXT_FOR_SUBMOUNT) {
- if (!mount_capable(fc))
- return -EPERM;
- }
-
/* Get the mountable root in fc->root, with a ref on the root and a ref
* on the superblock.
*/