Btrfs: Add readonly inode flag
This patch adds readonly inode flag support. A file with this flag
can't be modified, but can be deleted.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index fba0478..fd0e0d8 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2850,6 +2850,13 @@
btrfs_throttle(root);
return err;
}
+static int btrfs_permission(struct inode *inode, int mask,
+ struct nameidata *nd)
+{
+ if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE))
+ return -EACCES;
+ return generic_permission(inode, mask, NULL);
+}
static struct inode_operations btrfs_dir_inode_operations = {
.lookup = btrfs_lookup,
@@ -2866,12 +2873,12 @@
.getxattr = generic_getxattr,
.listxattr = btrfs_listxattr,
.removexattr = generic_removexattr,
+ .permission = btrfs_permission,
};
-
static struct inode_operations btrfs_dir_ro_inode_operations = {
.lookup = btrfs_lookup,
+ .permission = btrfs_permission,
};
-
static struct file_operations btrfs_dir_file_operations = {
.llseek = generic_file_llseek,
.read = generic_read_dir,
@@ -2916,15 +2923,16 @@
.getxattr = generic_getxattr,
.listxattr = btrfs_listxattr,
.removexattr = generic_removexattr,
+ .permission = btrfs_permission,
};
-
static struct inode_operations btrfs_special_inode_operations = {
.getattr = btrfs_getattr,
.setattr = btrfs_setattr,
+ .permission = btrfs_permission,
};
-
static struct inode_operations btrfs_symlink_inode_operations = {
.readlink = generic_readlink,
.follow_link = page_follow_link_light,
.put_link = page_put_link,
+ .permission = btrfs_permission,
};