diff options
Diffstat (limited to 'mm/swapfile.c')
| -rw-r--r-- | mm/swapfile.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c index 957fef43fa60..f1e69c30d203 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -25,6 +25,7 @@ #include <linux/rmap.h> #include <linux/security.h> #include <linux/backing-dev.h> +#include <linux/mutex.h> #include <linux/capability.h> #include <linux/syscalls.h> @@ -46,12 +47,12 @@ struct swap_list_t swap_list = {-1, -1}; struct swap_info_struct swap_info[MAX_SWAPFILES]; -static DECLARE_MUTEX(swapon_sem); +static DEFINE_MUTEX(swapon_mutex); /* * We need this because the bdev->unplug_fn can sleep and we cannot * hold swap_lock while calling the unplug_fn. And swap_lock - * cannot be turned into a semaphore. + * cannot be turned into a mutex. */ static DECLARE_RWSEM(swap_unplug_sem); @@ -1161,7 +1162,7 @@ asmlinkage long sys_swapoff(const char __user * specialfile) up_write(&swap_unplug_sem); destroy_swap_extents(p); - down(&swapon_sem); + mutex_lock(&swapon_mutex); spin_lock(&swap_lock); drain_mmlist(); @@ -1180,7 +1181,7 @@ asmlinkage long sys_swapoff(const char __user * specialfile) p->swap_map = NULL; p->flags = 0; spin_unlock(&swap_lock); - up(&swapon_sem); + mutex_unlock(&swapon_mutex); vfree(swap_map); inode = mapping->host; if (S_ISBLK(inode->i_mode)) { @@ -1209,7 +1210,7 @@ static void *swap_start(struct seq_file *swap, loff_t *pos) int i; loff_t l = *pos; - down(&swapon_sem); + mutex_lock(&swapon_mutex); for (i = 0; i < nr_swapfiles; i++, ptr++) { if (!(ptr->flags & SWP_USED) || !ptr->swap_map) @@ -1238,7 +1239,7 @@ static void *swap_next(struct seq_file *swap, void *v, loff_t *pos) static void swap_stop(struct seq_file *swap, void *v) { - up(&swapon_sem); + mutex_unlock(&swapon_mutex); } static int swap_show(struct seq_file *swap, void *v) @@ -1540,7 +1541,7 @@ asmlinkage long sys_swapon(const char __user * specialfile, int swap_flags) goto bad_swap; } - down(&swapon_sem); + mutex_lock(&swapon_mutex); spin_lock(&swap_lock); p->flags = SWP_ACTIVE; nr_swap_pages += nr_good_pages; @@ -1566,7 +1567,7 @@ asmlinkage long sys_swapon(const char __user * specialfile, int swap_flags) swap_info[prev].next = p - swap_info; } spin_unlock(&swap_lock); - up(&swapon_sem); + mutex_unlock(&swapon_mutex); error = 0; goto out; bad_swap: |