[PATCH 12/24] sys_swapon: use a single error label
From: Cesar Eduardo Barros <hidden>
Date: 2011-02-12 18:49:47
Subsystem:
memory management, memory management - swap, the rest · Maintainers:
Andrew Morton, Chris Li, Kairui Song, Linus Torvalds
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 <redacted> --- mm/swapfile.c | 7 +++---- 1 files changed, 3 insertions(+), 4 deletions(-)
diff --git a/mm/swapfile.c b/mm/swapfile.c
index f122f4a..57eff7e 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;
--
1.7.4
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