aboutsummaryrefslogtreecommitdiffstats
path: root/fs/hpfs/super.c
diff options
context:
space:
mode:
authorJan Blunck <jblunck@infradead.org>2010-08-15 16:51:10 -0400
committerArnd Bergmann <arnd@arndb.de>2010-10-04 15:10:10 -0400
commitdb71922217a214e5c9268448e537b54fc1f301ea (patch)
tree9c9afbf29411547891f6968e5ade29ce59d66c07 /fs/hpfs/super.c
parent899611ee7d373e5eeda08e9a8632684e1ebbbf00 (diff)
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: Jan Blunck <jblunck@infradead.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Matthew Wilcox <matthew@wil.cx> Cc: Christoph Hellwig <hch@infradead.org>
Diffstat (limited to 'fs/hpfs/super.c')
-rw-r--r--fs/hpfs/super.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/fs/hpfs/super.c b/fs/hpfs/super.c
index 2607010be2fe..c969a1aa163a 100644
--- a/fs/hpfs/super.c
+++ b/fs/hpfs/super.c
@@ -477,11 +477,15 @@ static int hpfs_fill_super(struct super_block *s, void *options, int silent)
477 477
478 int o; 478 int o;
479 479
480 lock_kernel();
481
480 save_mount_options(s, options); 482 save_mount_options(s, options);
481 483
482 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 484 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
483 if (!sbi) 485 if (!sbi) {
486 unlock_kernel();
484 return -ENOMEM; 487 return -ENOMEM;
488 }
485 s->s_fs_info = sbi; 489 s->s_fs_info = sbi;
486 490
487 sbi->sb_bmp_dir = NULL; 491 sbi->sb_bmp_dir = NULL;
@@ -666,6 +670,7 @@ static int hpfs_fill_super(struct super_block *s, void *options, int silent)
666 root->i_blocks = 5; 670 root->i_blocks = 5;
667 hpfs_brelse4(&qbh); 671 hpfs_brelse4(&qbh);
668 } 672 }
673 unlock_kernel();
669 return 0; 674 return 0;
670 675
671bail4: brelse(bh2); 676bail4: brelse(bh2);
@@ -677,6 +682,7 @@ bail0:
677 kfree(sbi->sb_cp_table); 682 kfree(sbi->sb_cp_table);
678 s->s_fs_info = NULL; 683 s->s_fs_info = NULL;
679 kfree(sbi); 684 kfree(sbi);
685 unlock_kernel();
680 return -EINVAL; 686 return -EINVAL;
681} 687}
682 688