[PATCH] swsusp: low level interface

Introduce the low level interface that can be used for handling the
snapshot of the system memory by the in-kernel swap-writing/reading code of
swsusp and the userland interface code (to be introduced shortly).

Also change the way in which swsusp records the allocated swap pages and,
consequently, simplifies the in-kernel swap-writing/reading code (this is
necessary for the userland interface too).  To this end, it introduces two
helper functions in mm/swapfile.c, so that the swsusp code does not refer
directly to the swap internals.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 54 insertions, 1 deletions

diff --git a/mm/swapfile.c b/mm/swapfile.c
index 365ed6ff182d..4d11f9d84666 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -45,7 +45,7 @@ static const char Unused_offset[] = "Unused swap offset entry ";
 
 struct swap_list_t swap_list = {-1, -1};
 
-struct swap_info_struct swap_info[MAX_SWAPFILES];
+static struct swap_info_struct swap_info[MAX_SWAPFILES];
 
 static DEFINE_MUTEX(swapon_mutex);
 
@@ -417,6 +417,59 @@ void free_swap_and_cache(swp_entry_t entry)
         }
 }
 
+#ifdef CONFIG_SOFTWARE_SUSPEND
+/*
+ * Find the swap type that corresponds to given device (if any)
+ *
+ * This is needed for software suspend and is done in such a way that inode
+ * aliasing is allowed.
+ */
+int swap_type_of(dev_t device)
+{
+        int i;
+
+        if (!device)
+                return -EINVAL;
+        spin_lock(&swap_lock);
+        for (i = 0; i < nr_swapfiles; i++) {
+                struct inode *inode;
+
+                if (!(swap_info[i].flags & SWP_WRITEOK))
+                        continue;
+                inode = swap_info->swap_file->f_dentry->d_inode;
+                if (S_ISBLK(inode->i_mode) &&
+                    device == MKDEV(imajor(inode), iminor(inode))) {
+                        spin_unlock(&swap_lock);
+                        return i;
+                }
+        }
+        spin_unlock(&swap_lock);
+        return -ENODEV;
+}
+
+/*
+ * Return either the total number of swap pages of given type, or the number
+ * of free pages of that type (depending on @free)
+ *
+ * This is needed for software suspend
+ */
+unsigned int count_swap_pages(int type, int free)
+{
+        unsigned int n = 0;
+
+        if (type < nr_swapfiles) {
+                spin_lock(&swap_lock);
+                if (swap_info[type].flags & SWP_WRITEOK) {
+                        n = swap_info[type].pages;
+                        if (free)
+                                n -= swap_info[type].inuse_pages;
+                }
+                spin_unlock(&swap_lock);
+        }
+        return n;
+}
+#endif
+
 /*
  * No need to decide whether this PTE shares the swap entry with others,
  * just let do_wp_page work it out if a write is requested later - to