BKL: Explicitly add BKL around get_sb/fill_super

This patch is a preparation necessary to remove the BKL from do_new_mount().
It explicitly adds calls to lock_kernel()/unlock_kernel() around
get_sb/fill_super operations for filesystems that still uses the BKL.

I've read through all the code formerly covered by the BKL inside
do_kern_mount() and have satisfied myself that it doesn't need the BKL
any more.

do_kern_mount() is already called without the BKL when mounting the rootfs
and in nfsctl. do_kern_mount() calls vfs_kern_mount(), which is called
from various places without BKL: simple_pin_fs(), nfs_do_clone_mount()
through nfs_follow_mountpoint(), afs_mntpt_do_automount() through
afs_mntpt_follow_link(). Both later functions are actually the filesystems
follow_link inode operation. vfs_kern_mount() is calling the specified
get_sb function and lets the filesystem do its job by calling the given
fill_super function.

Therefore I think it is safe to push down the BKL from the VFS to the
low-level filesystems get_sb/fill_super operation.

[arnd: do not add the BKL to those file systems that already
       don't use it elsewhere]
Signed-off-by: NJan Blunck <jblunck@infradead.org>
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Cc: Matthew Wilcox <matthew@wil.cx>
Cc: Christoph Hellwig <hch@infradead.org>

fs/adfs/super.c

@@ -352,11 +352,15 @@ static int adfs_fill_super(struct super_block *sb, void *data, int silent)
 	struct adfs_sb_info *asb;
 	struct inode *root;
 
+	lock_kernel();
+
 	sb->s_flags |= MS_NODIRATIME;
 
 	asb = kzalloc(sizeof(*asb), GFP_KERNEL);
-	if (!asb)
+	if (!asb) {
+		unlock_kernel();
 		return -ENOMEM;
+	}
 	sb->s_fs_info = asb;
 
 	/* set default options */
@@ -474,6 +478,7 @@ static int adfs_fill_super(struct super_block *sb, void *data, int silent)
 		goto error;
 	} else
 		sb->s_root->d_op = &adfs_dentry_operations;
+	unlock_kernel();
 	return 0;
 
 error_free_bh:
@@ -481,6 +486,7 @@ static int adfs_fill_super(struct super_block *sb, void *data, int silent)
 error:
 	sb->s_fs_info = NULL;
 	kfree(asb);
+	unlock_kernel();
 	return -EINVAL;
 }
 

fs/affs/super.c

@@ -291,6 +291,8 @@ static int affs_fill_super(struct super_block *sb, void *data, int silent)
 	u8			 sig[4];
 	int			 ret = -EINVAL;
 
+	lock_kernel();
+
 	save_mount_options(sb, data);
 
 	pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
@@ -300,8 +302,10 @@ static int affs_fill_super(struct super_block *sb, void *data, int silent)
 	sb->s_flags |= MS_NODIRATIME;
 
 	sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
-	if (!sbi)
+	if (!sbi) {
+		unlock_kernel();
 		return -ENOMEM;
+	}
 	sb->s_fs_info = sbi;
 	mutex_init(&sbi->s_bmlock);
 	spin_lock_init(&sbi->symlink_lock);
@@ -312,6 +316,7 @@ static int affs_fill_super(struct super_block *sb, void *data, int silent)
 		printk(KERN_ERR "AFFS: Error parsing options\n");
 		kfree(sbi->s_prefix);
 		kfree(sbi);
+		unlock_kernel();
 		return -EINVAL;
 	}
 	/* N.B. after this point s_prefix must be released */
@@ -482,6 +487,7 @@ static int affs_fill_super(struct super_block *sb, void *data, int silent)
 	sb->s_root->d_op = &affs_dentry_operations;
 
 	pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
+	unlock_kernel();
 	return 0;
 
 	/*
@@ -496,6 +502,7 @@ static int affs_fill_super(struct super_block *sb, void *data, int silent)
 	kfree(sbi->s_prefix);
 	kfree(sbi);
 	sb->s_fs_info = NULL;
+	unlock_kernel();
 	return ret;
 }
 

fs/afs/super.c

@@ -302,12 +302,15 @@ static int afs_fill_super(struct super_block *sb, void *data)
 	struct inode *inode = NULL;
 	int ret;
 
+	lock_kernel();
+
 	_enter("");
 
 	/* allocate a superblock info record */
 	as = kzalloc(sizeof(struct afs_super_info), GFP_KERNEL);
 	if (!as) {
 		_leave(" = -ENOMEM");
+		unlock_kernel();
 		return -ENOMEM;
 	}
 
@@ -341,6 +344,7 @@ static int afs_fill_super(struct super_block *sb, void *data)
 	sb->s_root = root;
 
 	_leave(" = 0");
+	unlock_kernel();
 	return 0;
 
 error_inode:
@@ -354,6 +358,7 @@ static int afs_fill_super(struct super_block *sb, void *data)
 	sb->s_fs_info = NULL;
 
 	_leave(" = %d", ret);
+	unlock_kernel();
 	return ret;
 }
 

fs/bfs/inode.c

@@ -322,9 +322,13 @@ static int bfs_fill_super(struct super_block *s, void *data, int silent)
 	int ret = -EINVAL;
 	unsigned long i_sblock, i_eblock, i_eoff, s_size;
 
+	lock_kernel();
+
 	info = kzalloc(sizeof(*info), GFP_KERNEL);
-	if (!info)
+	if (!info) {
+		unlock_kernel();
 		return -ENOMEM;
+	}
 	mutex_init(&info->bfs_lock);
 	s->s_fs_info = info;
 
@@ -439,6 +443,7 @@ static int bfs_fill_super(struct super_block *s, void *data, int silent)
 	brelse(bh);
 	brelse(sbh);
 	dump_imap("read_super", s);
+	unlock_kernel();
 	return 0;
 
 out3:
@@ -452,6 +457,7 @@ static int bfs_fill_super(struct super_block *s, void *data, int silent)
 	mutex_destroy(&info->bfs_lock);
 	kfree(info);
 	s->s_fs_info = NULL;
+	unlock_kernel();
 	return ret;
 }
 

fs/cifs/cifsfs.c

@@ -514,22 +514,30 @@ cifs_get_sb(struct file_system_type *fs_type,
 	    int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
 	int rc;
-	struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
+	struct super_block *sb;
+
+	lock_kernel();
+
+	sb = sget(fs_type, NULL, set_anon_super, NULL);
 
 	cFYI(1, "Devname: %s flags: %d ", dev_name, flags);
 
-	if (IS_ERR(sb))
+	if (IS_ERR(sb)) {
+		unlock_kernel();
 		return PTR_ERR(sb);
+	}
 
 	sb->s_flags = flags;
 
 	rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
 	if (rc) {
 		deactivate_locked_super(sb);
+		unlock_kernel();
 		return rc;
 	}
 	sb->s_flags |= MS_ACTIVE;
 	simple_set_mnt(mnt, sb);
+	unlock_kernel();
 	return 0;
 }
 

fs/coda/inode.c

@@ -148,6 +148,8 @@ static int coda_fill_super(struct super_block *sb, void *data, int silent)
 	int error;
 	int idx;
 
+	lock_kernel();
+
 	idx = get_device_index((struct coda_mount_data *) data);
 
 	/* Ignore errors in data, for backward compatibility */
@@ -159,11 +161,13 @@ static int coda_fill_super(struct super_block *sb, void *data, int silent)
 	vc = &coda_comms[idx];
 	if (!vc->vc_inuse) {
 		printk("coda_read_super: No pseudo device\n");
+		unlock_kernel();
 		return -EINVAL;
 	}
 
         if ( vc->vc_sb ) {
 		printk("coda_read_super: Device already mounted\n");
+		unlock_kernel();
 		return -EBUSY;
 	}
 
@@ -202,7 +206,8 @@ static int coda_fill_super(struct super_block *sb, void *data, int silent)
 	sb->s_root = d_alloc_root(root);
 	if (!sb->s_root)
 		goto error;
-        return 0;
+	unlock_kernel();
+	return 0;
 
  error:
 	bdi_destroy(&vc->bdi);
@@ -212,6 +217,7 @@ static int coda_fill_super(struct super_block *sb, void *data, int silent)
 	if (vc)
 		vc->vc_sb = NULL;
 
+	unlock_kernel();
 	return -EINVAL;
 }
 

fs/ecryptfs/main.c

@@ -36,6 +36,7 @@
 #include <linux/parser.h>
 #include <linux/fs_stack.h>
 #include <linux/slab.h>
+#include <linux/smp_lock.h>     /* For lock_kernel() */
 #include "ecryptfs_kernel.h"
 
 /**
@@ -550,6 +551,7 @@ static int ecryptfs_get_sb(struct file_system_type *fs_type, int flags,
 	const char *err = "Getting sb failed";
 	int rc;
 
+	lock_kernel();
 	sbi = kmem_cache_zalloc(ecryptfs_sb_info_cache, GFP_KERNEL);
 	if (!sbi) {
 		rc = -ENOMEM;
@@ -608,6 +610,7 @@ static int ecryptfs_get_sb(struct file_system_type *fs_type, int flags,
 		goto out;
 	}
 	simple_set_mnt(mnt, s);
+	unlock_kernel();
 	return 0;
 
 out:
@@ -616,6 +619,7 @@ static int ecryptfs_get_sb(struct file_system_type *fs_type, int flags,
 		kmem_cache_free(ecryptfs_sb_info_cache, sbi);
 	}
 	printk(KERN_ERR "%s; rc = [%d]\n", err, rc);
+	unlock_kernel();
 	return rc;
 }
 

fs/ext2/super.c

@@ -747,15 +747,18 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)
 	__le32 features;
 	int err;
 
+	lock_kernel();
+
+	err = -ENOMEM;
 	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 	if (!sbi)
-		return -ENOMEM;
+		goto failed_unlock;
 
 	sbi->s_blockgroup_lock =
 		kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
 	if (!sbi->s_blockgroup_lock) {
 		kfree(sbi);
-		return -ENOMEM;
+		goto failed_unlock;
 	}
 	sb->s_fs_info = sbi;
 	sbi->s_sb_block = sb_block;
@@ -1083,6 +1086,7 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)
 	if (ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY))
 		sb->s_flags |= MS_RDONLY;
 	ext2_write_super(sb);
+	unlock_kernel();
 	return 0;
 
 cantfind_ext2:
@@ -1107,6 +1111,8 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)
 	sb->s_fs_info = NULL;
 	kfree(sbi->s_blockgroup_lock);
 	kfree(sbi);
+failed_unlock:
+	unlock_kernel();
 	return ret;
 }
 

fs/ext3/super.c

@@ -1611,14 +1611,19 @@ static int ext3_fill_super (struct super_block *sb, void *data, int silent)
 	__le32 features;
 	int err;
 
+	lock_kernel();
+
 	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
-	if (!sbi)
+	if (!sbi) {
+		unlock_kernel();
 		return -ENOMEM;
+	}
 
 	sbi->s_blockgroup_lock =
 		kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
 	if (!sbi->s_blockgroup_lock) {
 		kfree(sbi);
+		unlock_kernel();
 		return -ENOMEM;
 	}
 	sb->s_fs_info = sbi;
@@ -2026,6 +2031,7 @@ static int ext3_fill_super (struct super_block *sb, void *data, int silent)
 		"writeback");
 
 	lock_kernel();
+	unlock_kernel();
 	return 0;
 
 cantfind_ext3:
@@ -2056,6 +2062,7 @@ static int ext3_fill_super (struct super_block *sb, void *data, int silent)
 	kfree(sbi->s_blockgroup_lock);
 	kfree(sbi);
 	lock_kernel();
+	unlock_kernel();
 	return ret;
 }
 

fs/ext4/super.c

@@ -2568,6 +2568,8 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 	int err;
 	unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
 
+	lock_kernel();
+
 	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 	if (!sbi)
 		goto out_free_orig;
@@ -3166,7 +3168,6 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 	if (es->s_error_count)
 		mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
 
-	lock_kernel();
 	kfree(orig_data);
 	return 0;
 
@@ -3213,8 +3214,11 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 	sb->s_fs_info = NULL;
 	kfree(sbi->s_blockgroup_lock);
 	kfree(sbi);
-	lock_kernel();
+	kfree(orig_data);
+	return ret;
+
 out_free_orig:
+	unlock_kernel();
 	kfree(orig_data);
 	return ret;
 }

fs/fat/namei_msdos.c

@@ -9,6 +9,7 @@
 #include <linux/module.h>
 #include <linux/time.h>
 #include <linux/buffer_head.h>
+#include <linux/smp_lock.h>     /* For lock_kernel() */
 #include "fat.h"
 
 /* Characters that are undesirable in an MS-DOS file name */
@@ -662,12 +663,16 @@ static int msdos_fill_super(struct super_block *sb, void *data, int silent)
 {
 	int res;
 
+	lock_kernel();
 	res = fat_fill_super(sb, data, silent, &msdos_dir_inode_operations, 0);
-	if (res)
+	if (res) {
+		unlock_kernel();
 		return res;
+	}
 
 	sb->s_flags |= MS_NOATIME;
 	sb->s_root->d_op = &msdos_dentry_operations;
+	unlock_kernel();
 	return 0;
 }
 

fs/fat/namei_vfat.c

@@ -21,6 +21,7 @@
 #include <linux/slab.h>
 #include <linux/buffer_head.h>
 #include <linux/namei.h>
+#include <linux/smp_lock.h>     /* For lock_kernel() */
 #include "fat.h"
 
 /*
@@ -1055,15 +1056,19 @@ static int vfat_fill_super(struct super_block *sb, void *data, int silent)
 {
 	int res;
 
+	lock_kernel();
 	res = fat_fill_super(sb, data, silent, &vfat_dir_inode_operations, 1);
-	if (res)
+	if (res) {
+		unlock_kernel();
 		return res;
+	}
 
 	if (MSDOS_SB(sb)->options.name_check != 's')
 		sb->s_root->d_op = &vfat_ci_dentry_ops;
 	else
 		sb->s_root->d_op = &vfat_dentry_ops;
 
+	unlock_kernel();
 	return 0;
 }
 

fs/freevxfs/vxfs_super.c

@@ -148,7 +148,7 @@ static int vxfs_remount(struct super_block *sb, int *flags, char *data)
  *   The superblock on success, else %NULL.
  *
  * Locking:
- *   We are under the bkl and @sbp->s_lock.
+ *   We are under @sbp->s_lock.
  */
 static int vxfs_fill_super(struct super_block *sbp, void *dp, int silent)
 {
@@ -159,11 +159,14 @@ static int vxfs_fill_super(struct super_block *sbp, void *dp, int silent)
 	struct inode *root;
 	int ret = -EINVAL;
 
+	lock_kernel();
+
 	sbp->s_flags |= MS_RDONLY;
 
 	infp = kzalloc(sizeof(*infp), GFP_KERNEL);
 	if (!infp) {
 		printk(KERN_WARNING "vxfs: unable to allocate incore superblock\n");
+		unlock_kernel();
 		return -ENOMEM;
 	}
 
@@ -236,6 +239,7 @@ static int vxfs_fill_super(struct super_block *sbp, void *dp, int silent)
 		goto out_free_ilist;
 	}
 
+	unlock_kernel();
 	return 0;
 	
 out_free_ilist:
@@ -245,6 +249,7 @@ static int vxfs_fill_super(struct super_block *sbp, void *dp, int silent)
 out:
 	brelse(bp);
 	kfree(infp);
+	unlock_kernel();
 	return ret;
 }
 

fs/hfs/super.c

@@ -382,9 +382,13 @@ static int hfs_fill_super(struct super_block *sb, void *data, int silent)
 	struct inode *root_inode;
 	int res;
 
+	lock_kernel();
+
 	sbi = kzalloc(sizeof(struct hfs_sb_info), GFP_KERNEL);
-	if (!sbi)
+	if (!sbi) {
+		unlock_kernel();
 		return -ENOMEM;
+	}
 	sb->s_fs_info = sbi;
 	INIT_HLIST_HEAD(&sbi->rsrc_inodes);
 
@@ -435,6 +439,7 @@ static int hfs_fill_super(struct super_block *sb, void *data, int silent)
 	sb->s_root->d_op = &hfs_dentry_operations;
 
 	/* everything's okay */
+	unlock_kernel();
 	return 0;
 
 bail_iput:
@@ -443,6 +448,7 @@ static int hfs_fill_super(struct super_block *sb, void *data, int silent)
 	printk(KERN_ERR "hfs: get root inode failed.\n");
 bail:
 	hfs_mdb_put(sb);
+	unlock_kernel();
 	return res;
 }
 

fs/hpfs/super.c

@@ -477,11 +477,15 @@ static int hpfs_fill_super(struct super_block *s, void *options, int silent)
 
 	int o;
 
+	lock_kernel();
+
 	save_mount_options(s, options);
 
 	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
-	if (!sbi)
+	if (!sbi) {
+		unlock_kernel();
 		return -ENOMEM;
+	}
 	s->s_fs_info = sbi;
 
 	sbi->sb_bmp_dir = NULL;
@@ -666,6 +670,7 @@ static int hpfs_fill_super(struct super_block *s, void *options, int silent)
 			root->i_blocks = 5;
 		hpfs_brelse4(&qbh);
 	}
+	unlock_kernel();
 	return 0;
 
 bail4:	brelse(bh2);
@@ -677,6 +682,7 @@ bail2:	brelse(bh0);
 	kfree(sbi->sb_cp_table);
 	s->s_fs_info = NULL;
 	kfree(sbi);
+	unlock_kernel();
 	return -EINVAL;
 }
 

fs/isofs/inode.c

@@ -571,11 +571,15 @@ static int isofs_fill_super(struct super_block *s, void *data, int silent)
 	int table, error = -EINVAL;
 	unsigned int vol_desc_start;
 
+	lock_kernel();
+
 	save_mount_options(s, data);
 
 	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
-	if (!sbi)
+	if (!sbi) {
+		unlock_kernel();
 		return -ENOMEM;
+	}
 	s->s_fs_info = sbi;
 
 	if (!parse_options((char *)data, &opt))
@@ -900,6 +904,7 @@ static int isofs_fill_super(struct super_block *s, void *data, int silent)
 
 	kfree(opt.iocharset);
 
+	unlock_kernel();
 	return 0;
 
 	/*
@@ -939,6 +944,7 @@ static int isofs_fill_super(struct super_block *s, void *data, int silent)
 	kfree(opt.iocharset);
 	kfree(sbi);
 	s->s_fs_info = NULL;
+	unlock_kernel();
 	return error;
 }
 

fs/jffs2/super.c

@@ -146,14 +146,19 @@ static const struct super_operations jffs2_super_operations =
 static int jffs2_fill_super(struct super_block *sb, void *data, int silent)
 {
 	struct jffs2_sb_info *c;
+	int ret;
+
+	lock_kernel();
 
 	D1(printk(KERN_DEBUG "jffs2_get_sb_mtd():"
 		  " New superblock for device %d (\"%s\")\n",
 		  sb->s_mtd->index, sb->s_mtd->name));
 
 	c = kzalloc(sizeof(*c), GFP_KERNEL);
-	if (!c)
+	if (!c) {
+		unlock_kernel();
 		return -ENOMEM;
+	}
 
 	c->mtd = sb->s_mtd;
 	c->os_priv = sb;
@@ -175,7 +180,9 @@ static int jffs2_fill_super(struct super_block *sb, void *data, int silent)
 #ifdef CONFIG_JFFS2_FS_POSIX_ACL
 	sb->s_flags |= MS_POSIXACL;
 #endif
-	return jffs2_do_fill_super(sb, data, silent);
+	ret = jffs2_do_fill_super(sb, data, silent);
+	unlock_kernel();
+	return ret;
 }
 
 static int jffs2_get_sb(struct file_system_type *fs_type,

fs/jfs/super.c

@@ -438,14 +438,20 @@ static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 	s64 newLVSize = 0;
 	int flag, ret = -EINVAL;
 
+	lock_kernel();
+
 	jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
 
-	if (!new_valid_dev(sb->s_bdev->bd_dev))
+	if (!new_valid_dev(sb->s_bdev->bd_dev)) {
+		unlock_kernel();
 		return -EOVERFLOW;
+	}
 
 	sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
-	if (!sbi)
+	if (!sbi) {
+		unlock_kernel();
 		return -ENOMEM;
+	}
 	sb->s_fs_info = sbi;
 	sbi->sb = sb;
 	sbi->uid = sbi->gid = sbi->umask = -1;
@@ -542,6 +548,7 @@ static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 	sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, (u64)sb->s_maxbytes);
 #endif
 	sb->s_time_gran = 1;
+	unlock_kernel();
 	return 0;
 
 out_no_root:
@@ -564,6 +571,7 @@ static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 		unload_nls(sbi->nls_tab);
 out_kfree:
 	kfree(sbi);
+	unlock_kernel();
 	return ret;
 }
 

fs/nilfs2/super.c

@@ -1113,9 +1113,12 @@ nilfs_get_sb(struct file_system_type *fs_type, int flags,
 	if (!(flags & MS_RDONLY))
 		mode |= FMODE_WRITE;
 
+	lock_kernel();
 	sd.bdev = open_bdev_exclusive(dev_name, mode, fs_type);
-	if (IS_ERR(sd.bdev))
+	if (IS_ERR(sd.bdev)) {
+		unlock_kernel();
 		return PTR_ERR(sd.bdev);
+	}
 
 	/*
 	 * To get mount instance using sget() vfs-routine, NILFS needs
@@ -1198,6 +1201,7 @@ nilfs_get_sb(struct file_system_type *fs_type, int flags,
 	if (need_to_close)
 		close_bdev_exclusive(sd.bdev, mode);
 	simple_set_mnt(mnt, s);
+	unlock_kernel();
 	return 0;
 
  failed_unlock:
@@ -1206,6 +1210,7 @@ nilfs_get_sb(struct file_system_type *fs_type, int flags,
  failed:
 	close_bdev_exclusive(sd.bdev, mode);
 
+	unlock_kernel();
 	return err;
 
  cancel_new:
@@ -1218,6 +1223,7 @@ nilfs_get_sb(struct file_system_type *fs_type, int flags,
 	 * We must finish all post-cleaning before this call;
 	 * put_nilfs() needs the block device.
 	 */
+	unlock_kernel();
 	return err;
 }
 

fs/ntfs/super.c

@@ -2732,6 +2732,8 @@ static int ntfs_fill_super(struct super_block *sb, void *opt, const int silent)
 	struct inode *tmp_ino;
 	int blocksize, result;
 
+	lock_kernel();
+
 	/*
 	 * We do a pretty difficult piece of bootstrap by reading the
 	 * MFT (and other metadata) from disk into memory. We'll only
@@ -2755,6 +2757,7 @@ static int ntfs_fill_super(struct super_block *sb, void *opt, const int silent)
 			ntfs_error(sb, "Allocation of NTFS volume structure "
 					"failed. Aborting mount...");
 		lockdep_on();
+		unlock_kernel();
 		return -ENOMEM;
 	}
 	/* Initialize ntfs_volume structure. */
@@ -2942,6 +2945,7 @@ static int ntfs_fill_super(struct super_block *sb, void *opt, const int silent)
 		sb->s_export_op = &ntfs_export_ops;
 		lock_kernel();
 		lockdep_on();
+		unlock_kernel();
 		return 0;
 	}
 	ntfs_error(sb, "Failed to allocate root directory.");
@@ -3062,6 +3066,7 @@ static int ntfs_fill_super(struct super_block *sb, void *opt, const int silent)
 	kfree(vol);
 	ntfs_debug("Failed, returning -EINVAL.");
 	lockdep_on();
+	unlock_kernel();
 	return -EINVAL;
 }
 

fs/ocfs2/dlmfs/dlmfs.c

@@ -44,6 +44,7 @@
 #include <linux/string.h>
 #include <linux/backing-dev.h>
 #include <linux/poll.h>
+#include <linux/smp_lock.h>
 
 #include <asm/uaccess.h>
 
@@ -588,21 +589,27 @@ static int dlmfs_fill_super(struct super_block * sb,
 	struct inode * inode;
 	struct dentry * root;
 
+	lock_kernel();
+
 	sb->s_maxbytes = MAX_LFS_FILESIZE;
 	sb->s_blocksize = PAGE_CACHE_SIZE;
 	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
 	sb->s_magic = DLMFS_MAGIC;
 	sb->s_op = &dlmfs_ops;
 	inode = dlmfs_get_root_inode(sb);
-	if (!inode)
+	if (!inode) {
+		unlock_kernel();
 		return -ENOMEM;
+	}
 
 	root = d_alloc_root(inode);
 	if (!root) {
 		iput(inode);
+		unlock_kernel();
 		return -ENOMEM;
 	}
 	sb->s_root = root;
+	unlock_kernel();
 	return 0;
 }
 

fs/ocfs2/super.c

@@ -1002,6 +1002,8 @@ static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
 	char nodestr[8];
 	struct ocfs2_blockcheck_stats stats;
 
+	lock_kernel();
+
 	mlog_entry("%p, %p, %i", sb, data, silent);
 
 	if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
@@ -1179,6 +1181,7 @@ static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
 			atomic_set(&osb->vol_state, VOLUME_DISABLED);
 			wake_up(&osb->osb_mount_event);
 			mlog_exit(status);
+			unlock_kernel();
 			return status;
 		}
 	}
@@ -1193,6 +1196,7 @@ static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
 	ocfs2_orphan_scan_start(osb);
 
 	mlog_exit(status);
+	unlock_kernel();
 	return status;
 
 read_super_error:
@@ -1208,6 +1212,7 @@ static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
 	}
 
 	mlog_exit(status);
+	unlock_kernel();
 	return status;
 }
 

fs/qnx4/inode.c

@@ -234,9 +234,13 @@ static int qnx4_fill_super(struct super_block *s, void *data, int silent)
 	struct qnx4_sb_info *qs;
 	int ret = -EINVAL;
 
+	lock_kernel();
+
 	qs = kzalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL);
-	if (!qs)
+	if (!qs) {
+		unlock_kernel();
 		return -ENOMEM;
+	}
 	s->s_fs_info = qs;
 
 	sb_set_blocksize(s, QNX4_BLOCK_SIZE);
@@ -284,6 +288,7 @@ static int qnx4_fill_super(struct super_block *s, void *data, int silent)
 
 	brelse(bh);
 
+	unlock_kernel();
 	return 0;
 
       outi:
@@ -293,6 +298,7 @@ static int qnx4_fill_super(struct super_block *s, void *data, int silent)
       outnobh:
 	kfree(qs);
 	s->s_fs_info = NULL;
+	unlock_kernel();
 	return ret;
 }
 

fs/smbfs/inode.c

@@ -501,6 +501,8 @@ static int smb_fill_super(struct super_block *sb, void *raw_data, int silent)
 	void *mem;
 	static int warn_count;
 
+	lock_kernel();
+
 	if (warn_count < 5) {
 		warn_count++;
 		printk(KERN_EMERG "smbfs is deprecated and will be removed"
@@ -621,6 +623,7 @@ static int smb_fill_super(struct super_block *sb, void *raw_data, int silent)
 
 	smb_new_dentry(sb->s_root);
 
+	unlock_kernel();
 	return 0;
 
 out_no_root:
@@ -643,9 +646,11 @@ static int smb_fill_super(struct super_block *sb, void *raw_data, int silent)
 out_no_data:
 	printk(KERN_ERR "smb_fill_super: missing data argument\n");
 out_fail:
+	unlock_kernel();
 	return -EINVAL;
 out_no_server:
 	printk(KERN_ERR "smb_fill_super: cannot allocate struct smb_sb_info\n");
+	unlock_kernel();
 	return -ENOMEM;
 }
 

fs/squashfs/super.c

@@ -87,11 +87,14 @@ static int squashfs_fill_super(struct super_block *sb, void *data, int silent)
 	u64 lookup_table_start, xattr_id_table_start;
 	int err;
 
+	lock_kernel();
+
 	TRACE("Entered squashfs_fill_superblock\n");
 
 	sb->s_fs_info = kzalloc(sizeof(*msblk), GFP_KERNEL);
 	if (sb->s_fs_info == NULL) {
 		ERROR("Failed to allocate squashfs_sb_info\n");
+		unlock_kernel();
 		return -ENOMEM;
 	}
 	msblk = sb->s_fs_info;
@@ -301,6 +304,7 @@ static int squashfs_fill_super(struct super_block *sb, void *data, int silent)
 
 	TRACE("Leaving squashfs_fill_super\n");
 	kfree(sblk);
+	unlock_kernel();
 	return 0;
 
 failed_mount:
@@ -315,11 +319,13 @@ static int squashfs_fill_super(struct super_block *sb, void *data, int silent)
 	kfree(sb->s_fs_info);
 	sb->s_fs_info = NULL;
 	kfree(sblk);
+	unlock_kernel();
 	return err;
 
 failure:
 	kfree(sb->s_fs_info);
 	sb->s_fs_info = NULL;
+	unlock_kernel();
 	return -ENOMEM;
 }
 

fs/udf/super.c

@@ -1880,6 +1880,8 @@ static int udf_fill_super(struct super_block *sb, void *options, int silent)
 	struct kernel_lb_addr rootdir, fileset;
 	struct udf_sb_info *sbi;
 
+	lock_kernel();
+
 	uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
 	uopt.uid = -1;
 	uopt.gid = -1;
@@ -1888,8 +1890,10 @@ static int udf_fill_super(struct super_block *sb, void *options, int silent)
 	uopt.dmode = UDF_INVALID_MODE;
 
 	sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
-	if (!sbi)
+	if (!sbi) {
+		unlock_kernel();
 		return -ENOMEM;
+	}
 
 	sb->s_fs_info = sbi;
 
@@ -2035,6 +2039,7 @@ static int udf_fill_super(struct super_block *sb, void *options, int silent)
 		goto error_out;
 	}
 	sb->s_maxbytes = MAX_LFS_FILESIZE;
+	unlock_kernel();
 	return 0;
 
 error_out:
@@ -2055,6 +2060,7 @@ static int udf_fill_super(struct super_block *sb, void *options, int silent)
 	kfree(sbi);
 	sb->s_fs_info = NULL;
 
+	unlock_kernel();
 	return -EINVAL;
 }
 

fs/ufs/super.c

@@ -696,6 +696,8 @@ static int ufs_fill_super(struct super_block *sb, void *data, int silent)
 	unsigned maxsymlen;
 	int ret = -EINVAL;
 
+	lock_kernel();
+
 	uspi = NULL;
 	ubh = NULL;
 	flags = 0;
@@ -1163,6 +1165,7 @@ static int ufs_fill_super(struct super_block *sb, void *data, int silent)
 			goto failed;
 
 	UFSD("EXIT\n");
+	unlock_kernel();
 	return 0;
 
 dalloc_failed:
@@ -1174,10 +1177,12 @@ static int ufs_fill_super(struct super_block *sb, void *data, int silent)
 	kfree(sbi);
 	sb->s_fs_info = NULL;
 	UFSD("EXIT (FAILED)\n");
+	unlock_kernel();
 	return ret;
 
 failed_nomem:
 	UFSD("EXIT (NOMEM)\n");
+	unlock_kernel();
 	return -ENOMEM;
 }
 

kernel/cgroup.c

@@ -1430,6 +1430,8 @@ static int cgroup_get_sb(struct file_system_type *fs_type,
 	struct super_block *sb;
 	struct cgroupfs_root *new_root;
 
+	lock_kernel();
+
 	/* First find the desired set of subsystems */
 	mutex_lock(&cgroup_mutex);
 	ret = parse_cgroupfs_options(data, &opts);
@@ -1559,6 +1561,7 @@ static int cgroup_get_sb(struct file_system_type *fs_type,
 	simple_set_mnt(mnt, sb);
 	kfree(opts.release_agent);
 	kfree(opts.name);
+	unlock_kernel();
 	return 0;
 
  drop_new_super:
@@ -1568,6 +1571,7 @@ static int cgroup_get_sb(struct file_system_type *fs_type,
  out_err:
 	kfree(opts.release_agent);
 	kfree(opts.name);
+	unlock_kernel();
 
 	return ret;
 }