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vfs: check i_nlink limits in vfs_{mkdir,rename_dir,link}

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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 <[email protected]>
This commit is contained in:
Al Viro 2012-02-06 12:45:27 -05:00
commit 8de5277879
26 changed files with 46 additions and 149 deletions
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14
fs/ufs/namei.c
View file

@ -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;

1
fs/ufs/super.c
View file

@ -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)) {