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/exofs/namei.c b/fs/exofs/namei.c
index 9dbf0c3..fc7161d 100644
--- a/fs/exofs/namei.c
+++ b/fs/exofs/namei.c
@@ -143,9 +143,6 @@
{
struct inode *inode = old_dentry->d_inode;
- if (inode->i_nlink >= EXOFS_LINK_MAX)
- return -EMLINK;
-
inode->i_ctime = CURRENT_TIME;
inode_inc_link_count(inode);
ihold(inode);
@@ -156,10 +153,7 @@
static int exofs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
{
struct inode *inode;
- int err = -EMLINK;
-
- if (dir->i_nlink >= EXOFS_LINK_MAX)
- goto out;
+ int err;
inode_inc_link_count(dir);
@@ -275,11 +269,6 @@
if (err)
goto out_dir;
} else {
- if (dir_de) {
- err = -EMLINK;
- if (new_dir->i_nlink >= EXOFS_LINK_MAX)
- goto out_dir;
- }
err = exofs_add_link(new_dentry, old_inode);
if (err)
goto out_dir;
diff --git a/fs/exofs/super.c b/fs/exofs/super.c
index d22cd16..6cafcad 100644
--- a/fs/exofs/super.c
+++ b/fs/exofs/super.c
@@ -754,6 +754,7 @@
sb->s_blocksize = EXOFS_BLKSIZE;
sb->s_blocksize_bits = EXOFS_BLKSHIFT;
sb->s_maxbytes = MAX_LFS_FILESIZE;
+ sb->s_max_links = EXOFS_LINK_MAX;
atomic_set(&sbi->s_curr_pending, 0);
sb->s_bdev = NULL;
sb->s_dev = 0;