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/logfs/dir.c b/fs/logfs/dir.c
index 3de7a32..4aea231 100644
--- a/fs/logfs/dir.c
+++ b/fs/logfs/dir.c
@@ -558,9 +558,6 @@
{
struct inode *inode = old_dentry->d_inode;
- if (inode->i_nlink >= LOGFS_LINK_MAX)
- return -EMLINK;
-
inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
ihold(inode);
inc_nlink(inode);
diff --git a/fs/logfs/super.c b/fs/logfs/super.c
index c9ee7f5..b1a491a 100644
--- a/fs/logfs/super.c
+++ b/fs/logfs/super.c
@@ -542,6 +542,7 @@
* the filesystem incompatible with 32bit systems.
*/
sb->s_maxbytes = (1ull << 43) - 1;
+ sb->s_max_links = LOGFS_LINK_MAX;
sb->s_op = &logfs_super_operations;
sb->s_flags = flags | MS_NOATIME;
