From 8de52778798fe39660a8d6b26f290e0c93202761 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Mon, 6 Feb 2012 12:45:27 -0500 Subject: 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 --- fs/ufs/namei.c | 14 +------------- fs/ufs/super.c | 1 + 2 files changed, 2 insertions(+), 13 deletions(-) (limited to 'fs/ufs') diff --git a/fs/ufs/namei.c b/fs/ufs/namei.c index 38cac199edf..a2281cadefa 100644 --- a/fs/ufs/namei.c +++ b/fs/ufs/namei.c @@ -166,10 +166,6 @@ static int ufs_link (struct dentry * old_dentry, struct inode * dir, 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_link (struct dentry * old_dentry, struct inode * dir, 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 @@ static int ufs_rename(struct inode *old_dir, struct dentry *old_dentry, 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; diff --git a/fs/ufs/super.c b/fs/ufs/super.c index 5246ee3e560..ec25d09fcaa 100644 --- a/fs/ufs/super.c +++ b/fs/ufs/super.c @@ -1157,6 +1157,7 @@ magic_found: "fast symlink size (%u)\n", uspi->s_maxsymlinklen); uspi->s_maxsymlinklen = maxsymlen; } + sb->s_max_links = UFS_LINK_MAX; inode = ufs_iget(sb, UFS_ROOTINO); if (IS_ERR(inode)) { -- cgit v1.2.3