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| author | Cesar Eduardo Barros <cesarb@cesarb.net> | 2011-03-22 16:33:25 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-03-22 17:44:07 -0700 |
| commit | bd69010b042a60ca41a890df1b10019e94746c2f (patch) | |
| tree | 4064703903170911b09919f89b74a5bbe0d5ebfe /mm | |
| parent | 9b01c350af4fb00fe2ab66ff9bf16058c50b69bd (diff) | |
| download | linux-bd69010b042a60ca41a890df1b10019e94746c2f.tar.gz linux-bd69010b042a60ca41a890df1b10019e94746c2f.tar.bz2 linux-bd69010b042a60ca41a890df1b10019e94746c2f.zip | |
sys_swapon: use a single error label
sys_swapon currently has two error labels, bad_swap and bad_swap_2.
bad_swap does the same as bad_swap_2 plus destroy_swap_extents() and
swap_cgroup_swapoff(); both are noops in the places where bad_swap_2 is
jumped to. With a single extra test for inode (matching the one in the
S_ISREG case below), all the error paths in the function can go to
bad_swap.
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>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/swapfile.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c index e356e5e70313..14590775212d 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -1918,13 +1918,13 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags) if (IS_ERR(name)) { error = PTR_ERR(name); name = NULL; - goto bad_swap_2; + goto bad_swap; } swap_file = filp_open(name, O_RDWR|O_LARGEFILE, 0); if (IS_ERR(swap_file)) { error = PTR_ERR(swap_file); swap_file = NULL; - goto bad_swap_2; + goto bad_swap; } p->swap_file = swap_file; @@ -2141,13 +2141,12 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags) error = 0; goto out; bad_swap: - if (S_ISBLK(inode->i_mode) && p->bdev) { + if (inode && S_ISBLK(inode->i_mode) && p->bdev) { set_blocksize(p->bdev, p->old_block_size); blkdev_put(p->bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL); } destroy_swap_extents(p); swap_cgroup_swapoff(p->type); -bad_swap_2: spin_lock(&swap_lock); p->swap_file = NULL; p->flags = 0; |