[XFS] use pagevec lookups This reduces the time spend in the radix tree

[firefly-linux-kernel-4.4.55.git] / mm / swapfile.c

diff --git a/mm/swapfile.c b/mm/swapfile.c
index edafeace301f01879e04d31c9bf9e5c01a4484e9..6544565a7c0f6de28879dcee44e6fcb63c2a2659 100644 (file)
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -211,6 +211,26 @@ noswap:
        return (swp_entry_t) {0};
 }
 
+swp_entry_t get_swap_page_of_type(int type)
+{
+       struct swap_info_struct *si;
+       pgoff_t offset;
+
+       spin_lock(&swap_lock);
+       si = swap_info + type;
+       if (si->flags & SWP_WRITEOK) {
+               nr_swap_pages--;
+               offset = scan_swap_map(si);
+               if (offset) {
+                       spin_unlock(&swap_lock);
+                       return swp_entry(type, offset);
+               }
+               nr_swap_pages++;
+       }
+       spin_unlock(&swap_lock);
+       return (swp_entry_t) {0};
+}
+
 static struct swap_info_struct * swap_info_get(swp_entry_t entry)
 {
        struct swap_info_struct * p;
@@ -1167,9 +1187,9 @@ asmlinkage long sys_swapoff(const char __user * specialfile)
                set_blocksize(bdev, p->old_block_size);
                bd_release(bdev);
        } else {
-               down(&inode->i_sem);
+               mutex_lock(&inode->i_mutex);
                inode->i_flags &= ~S_SWAPFILE;
-               up(&inode->i_sem);
+               mutex_unlock(&inode->i_mutex);
        }
        filp_close(swap_file, NULL);
        err = 0;
@@ -1386,7 +1406,7 @@ asmlinkage long sys_swapon(const char __user * specialfile, int swap_flags)
                p->bdev = bdev;
        } else if (S_ISREG(inode->i_mode)) {
                p->bdev = inode->i_sb->s_bdev;
-               down(&inode->i_sem);
+               mutex_lock(&inode->i_mutex);
                did_down = 1;
                if (IS_SWAPFILE(inode)) {
                        error = -EBUSY;
@@ -1473,7 +1493,7 @@ asmlinkage long sys_swapon(const char __user * specialfile, int swap_flags)
                        goto bad_swap;
                if (swap_header->info.nr_badpages > MAX_SWAP_BADPAGES)
                        goto bad_swap;
-               
+
                /* OK, set up the swap map and apply the bad block list */
                if (!(p->swap_map = vmalloc(maxpages * sizeof(short)))) {
                        error = -ENOMEM;
@@ -1482,17 +1502,17 @@ asmlinkage long sys_swapon(const char __user * specialfile, int swap_flags)
 
                error = 0;
                memset(p->swap_map, 0, maxpages * sizeof(short));
-               for (i=0; i<swap_header->info.nr_badpages; i++) {
-                       int page = swap_header->info.badpages[i];
-                       if (page <= 0 || page >= swap_header->info.last_page)
+               for (i = 0; i < swap_header->info.nr_badpages; i++) {
+                       int page_nr = swap_header->info.badpages[i];
+                       if (page_nr <= 0 || page_nr >= swap_header->info.last_page)
                                error = -EINVAL;
                        else
-                               p->swap_map[page] = SWAP_MAP_BAD;
+                               p->swap_map[page_nr] = SWAP_MAP_BAD;
                }
                nr_good_pages = swap_header->info.last_page -
                                swap_header->info.nr_badpages -
                                1 /* header page */;
-               if (error) 
+               if (error)
                        goto bad_swap;
        }
 
@@ -1576,7 +1596,7 @@ out:
        if (did_down) {
                if (!error)
                        inode->i_flags |= S_SWAPFILE;
-               up(&inode->i_sem);
+               mutex_unlock(&inode->i_mutex);
        }
        return error;
 }