A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-30 03:27:44 -04:00
Code Issues Projects Releases Packages Wiki Activity

BKL: Explicitly add BKL around get_sb/fill_super

Browse source 
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 <[email protected]>
Signed-off-by: Arnd Bergmann <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Christoph Hellwig <[email protected]>
This commit is contained in:
Jan Blunck 2010-08-15 22:51:10 +02:00 • committed by Arnd Bergmann
commit db71922217
28 changed files with 187 additions and 25 deletions
Download patch file Download diff file Expand all files Collapse all files

9
fs/affs/super.c
View file

@ -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 @@ got_root:
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 @@ out_error_noinode:
kfree(sbi->s_prefix);
kfree(sbi);
sb->s_fs_info = NULL;
unlock_kernel();
return ret;
}