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sys_swapon: separate bdev claim and inode lock 

Move the code which claims the bdev (S_ISBLK) or locks the inode
(S_ISREG) to a separate function. Only code movement, no functional
changes.

Signed-off-by: Cesar Eduardo Barros <cesarb@cesarb.net>
Tested-by: Eric B Munson <emunson@mgebm.net>
Acked-by: Eric B Munson <emunson@mgebm.net>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Cesar Eduardo Barros 2011-03-22 16:33:26 -07:00 committed by Linus Torvalds
parent bd69010b04
commit 4d0e1e1075
1 changed files with 39 additions and 25 deletions
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64
mm/swapfile.c
View File

@ -1889,6 +1889,43 @@ static struct swap_info_struct *alloc_swap_info(void)
return p;
}
static int claim_swapfile(struct swap_info_struct *p, struct inode *inode)
{
int error;
if (S_ISBLK(inode->i_mode)) {
p->bdev = bdgrab(I_BDEV(inode));
error = blkdev_get(p->bdev,
FMODE_READ | FMODE_WRITE | FMODE_EXCL,
sys_swapon);
if (error < 0) {
p->bdev = NULL;
error = -EINVAL;
goto bad_swap;
}
p->old_block_size = block_size(p->bdev);
error = set_blocksize(p->bdev, PAGE_SIZE);
if (error < 0)
goto bad_swap;
p->flags |= SWP_BLKDEV;
} else if (S_ISREG(inode->i_mode)) {
p->bdev = inode->i_sb->s_bdev;
mutex_lock(&inode->i_mutex);
if (IS_SWAPFILE(inode)) {
error = -EBUSY;
goto bad_swap;
}
} else {
error = -EINVAL;
goto bad_swap;
}
return 0;
bad_swap:
return error;
}
SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
{
struct swap_info_struct *p;
@ -1942,32 +1979,9 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
}
}
if (S_ISBLK(inode->i_mode)) {
p->bdev = bdgrab(I_BDEV(inode));
error = blkdev_get(p->bdev,
FMODE_READ | FMODE_WRITE | FMODE_EXCL,
sys_swapon);
if (error < 0) {
p->bdev = NULL;
error = -EINVAL;
goto bad_swap;
}
p->old_block_size = block_size(p->bdev);
error = set_blocksize(p->bdev, PAGE_SIZE);
if (error < 0)
goto bad_swap;
p->flags |= SWP_BLKDEV;
} else if (S_ISREG(inode->i_mode)) {
p->bdev = inode->i_sb->s_bdev;
mutex_lock(&inode->i_mutex);
if (IS_SWAPFILE(inode)) {
error = -EBUSY;
goto bad_swap;
}
} else {
error = -EINVAL;
error = claim_swapfile(p, inode);
if (unlikely(error))
goto bad_swap;
}
swapfilepages = i_size_read(inode) >> PAGE_SHIFT;