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[PATCH] swap: move destroy_swap_extents calls 

sys_swapon's call to destroy_swap_extents on failure is made after the final
swap_list_unlock, which is faintly unsafe: another sys_swapon might already be
setting up that swap_info_struct.  Calling it earlier, before taking
swap_list_lock, is safe.  sys_swapoff's call to destroy_swap_extents was safe,
but likewise move it earlier, before taking the locks (once try_to_unuse has
completed, nothing can be needing the swap extents).

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Hugh Dickins 2005-09-03 15:54:33 -07:00 committed by Linus Torvalds
parent e2244ec2ef
commit 4cd3bb10ff
1 changed files with 2 additions and 2 deletions
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4
mm/swapfile.c
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@ -1129,6 +1129,7 @@ asmlinkage long sys_swapoff(const char __user * specialfile)
swap_list_unlock();
goto out_dput;
}
destroy_swap_extents(p);
down(&swapon_sem);
swap_list_lock();
drain_mmlist();
@ -1139,7 +1140,6 @@ asmlinkage long sys_swapoff(const char __user * specialfile)
swap_map = p->swap_map;
p->swap_map = NULL;
p->flags = 0;
destroy_swap_extents(p);
swap_device_unlock(p);
swap_list_unlock();
up(&swapon_sem);
@ -1531,6 +1531,7 @@ bad_swap:
set_blocksize(bdev, p->old_block_size);
bd_release(bdev);
}
destroy_swap_extents(p);
bad_swap_2:
swap_list_lock();
swap_map = p->swap_map;
@ -1540,7 +1541,6 @@ bad_swap_2:
if (!(swap_flags & SWAP_FLAG_PREFER))
++least_priority;
swap_list_unlock();
destroy_swap_extents(p);
vfree(swap_map);
if (swap_file)
filp_close(swap_file, NULL);