vfs: check i_nlink limits in vfs_{mkdir,rename_dir,link}
New field of struct super_block - ->s_max_links. Maximal allowed
value of ->i_nlink or 0; in the latter case all checks still need
to be done in ->link/->mkdir/->rename instances. Note that this
limit applies both to directoris and to non-directories.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/ufs/namei.c b/fs/ufs/namei.c
index 38cac19..a2281ca 100644
--- a/fs/ufs/namei.c
+++ b/fs/ufs/namei.c
@@ -166,10 +166,6 @@
int error;
lock_ufs(dir->i_sb);
- if (inode->i_nlink >= UFS_LINK_MAX) {
- unlock_ufs(dir->i_sb);
- return -EMLINK;
- }
inode->i_ctime = CURRENT_TIME_SEC;
inode_inc_link_count(inode);
@@ -183,10 +179,7 @@
static int ufs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
{
struct inode * inode;
- int err = -EMLINK;
-
- if (dir->i_nlink >= UFS_LINK_MAX)
- goto out;
+ int err;
lock_ufs(dir->i_sb);
inode_inc_link_count(dir);
@@ -305,11 +298,6 @@
drop_nlink(new_inode);
inode_dec_link_count(new_inode);
} else {
- if (dir_de) {
- err = -EMLINK;
- if (new_dir->i_nlink >= UFS_LINK_MAX)
- goto out_dir;
- }
err = ufs_add_link(new_dentry, old_inode);
if (err)
goto out_dir;