Get the values to use for resume2= for swap that is currently enabled.
Particularly useful for files, where we need the device and block offset.
Signed-off-by: Nigel Cunningham <[email protected]>
kernel/power/suspend_swap.c | 60 +++++++++++++++++++++++++++++++++++++++++++
1 files changed, 60 insertions(+), 0 deletions(-)
diff --git a/kernel/power/suspend_swap.c b/kernel/power/suspend_swap.c
index eb14e3e..ee7c36b 100644
--- a/kernel/power/suspend_swap.c
+++ b/kernel/power/suspend_swap.c
@@ -1080,3 +1080,63 @@ invalid:
}
+static int header_locations_read_proc(char *page, char **start, off_t off, int count,
+ int *eof, void *data)
+{
+ int i, printedpartitionsmessage = 0, len = 0, haveswap = 0;
+ struct inode *swapf = 0;
+ int zone;
+ char *path_page = (char *) __get_free_page(GFP_KERNEL);
+ char *path;
+ int path_len;
+
+ *eof = 1;
+ if (!page)
+ return 0;
+
+ for (i = 0; i < MAX_SWAPFILES; i++) {
+ struct swap_info_struct *si = get_swap_info_struct(i);
+
+ if (!si->swap_file)
+ continue;
+
+ if (S_ISBLK(si->swap_file->f_mapping->host->i_mode)) {
+ haveswap = 1;
+ if (!printedpartitionsmessage) {
+ len += sprintf(page + len,
+ "For swap partitions, simply use the format: resume2=swap:/dev/hda1.\n");
+ printedpartitionsmessage = 1;
+ }
+ } else {
+ path_len = 0;
+
+ path = d_path(si->swap_file->f_dentry,
+ si->swap_file->f_vfsmnt,
+ path_page,
+ PAGE_SIZE);
+ path_len = snprintf(path_page, 31, "%s", path);
+
+ haveswap = 1;
+ swapf = si->swap_file->f_mapping->host;
+ if (!(zone = bmap(swapf,0))) {
+ len+= sprintf(page + len,
+ "Swapfile %s has been corrupted. Reuse mkswap on it and try again.\n",
+ path_page);
+ } else {
+ char name_buffer[255];
+ len+= sprintf(page + len, "For swapfile `%s`, use resume2=swap:/dev/%s:0x%x.\n",
+ path_page,
+ bdevname(si->bdev, name_buffer),
+ zone << (swapf->i_blkbits - 9));
+ }
+
+ }
+ }
+
+ if (!haveswap)
+ len = sprintf(page, "You need to turn on swap partitions before examining this file.\n");
+
+ free_page((unsigned long) path_page);
+ return len;
+}
+
--
Nigel Cunningham nigel at suspend2 dot net
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