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author | Jan Blunck <jblunck@infradead.org> | 2010-08-15 22:51:10 +0200 |
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committer | Arnd Bergmann <arnd@arndb.de> | 2010-10-04 21:10:10 +0200 |
commit | db71922217a214e5c9268448e537b54fc1f301ea (patch) | |
tree | 9c9afbf29411547891f6968e5ade29ce59d66c07 /fs/ext2 | |
parent | 899611ee7d373e5eeda08e9a8632684e1ebbbf00 (diff) | |
download | kernel_samsung_tuna-db71922217a214e5c9268448e537b54fc1f301ea.zip kernel_samsung_tuna-db71922217a214e5c9268448e537b54fc1f301ea.tar.gz kernel_samsung_tuna-db71922217a214e5c9268448e537b54fc1f301ea.tar.bz2 |
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/ext2')
-rw-r--r-- | fs/ext2/super.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/fs/ext2/super.c b/fs/ext2/super.c index 1ec6026..f98c390 100644 --- a/fs/ext2/super.c +++ b/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 @@ failed_sbi: sb->s_fs_info = NULL; kfree(sbi->s_blockgroup_lock); kfree(sbi); +failed_unlock: + unlock_kernel(); return ret; } |