Merge branch 'for-linus-4.6' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs

Pull btrfs fixes from Chris Mason:
 "This has a few fixes Dave Sterba had queued up.  These are all pretty
  small, but since they were tested I decided against waiting for more"

* 'for-linus-4.6' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
  btrfs: transaction_kthread() is not freezable
  btrfs: cleaner_kthread() doesn't need explicit freeze
  btrfs: do not write corrupted metadata blocks to disk
  btrfs: csum_tree_block: return proper errno value

1 files changed, 25 insertions, 20 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 4b02591b0301..d01f89d130e0 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -25,7 +25,6 @@
 #include <linux/buffer_head.h>
 #include <linux/workqueue.h>
 #include <linux/kthread.h>
-#include <linux/freezer.h>
 #include <linux/slab.h>
 #include <linux/migrate.h>
 #include <linux/ratelimit.h>
@@ -303,7 +302,7 @@ static int csum_tree_block(struct btrfs_fs_info *fs_info,
                 err = map_private_extent_buffer(buf, offset, 32,
                                         &kaddr, &map_start, &map_len);
                 if (err)
-                        return 1;
+                        return err;
                 cur_len = min(len, map_len - (offset - map_start));
                 crc = btrfs_csum_data(kaddr + offset - map_start,
                                       crc, cur_len);
@@ -313,7 +312,7 @@ static int csum_tree_block(struct btrfs_fs_info *fs_info,
         if (csum_size > sizeof(inline_result)) {
                 result = kzalloc(csum_size, GFP_NOFS);
                 if (!result)
-                        return 1;
+                        return -ENOMEM;
         } else {
                 result = (char *)&inline_result;
         }
@@ -334,7 +333,7 @@ static int csum_tree_block(struct btrfs_fs_info *fs_info,
                                 val, found, btrfs_header_level(buf));
                         if (result != (char *)&inline_result)
                                 kfree(result);
-                        return 1;
+                        return -EUCLEAN;
                 }
         } else {
                 write_extent_buffer(buf, result, 0, csum_size);
@@ -513,11 +512,21 @@ static int csum_dirty_buffer(struct btrfs_fs_info *fs_info, struct page *page)
         eb = (struct extent_buffer *)page->private;
         if (page != eb->pages[0])
                 return 0;
+
         found_start = btrfs_header_bytenr(eb);
-        if (WARN_ON(found_start != start || !PageUptodate(page)))
-                return 0;
-        csum_tree_block(fs_info, eb, 0);
-        return 0;
+        /*
+         * Please do not consolidate these warnings into a single if.
+         * It is useful to know what went wrong.
+         */
+        if (WARN_ON(found_start != start))
+                return -EUCLEAN;
+        if (WARN_ON(!PageUptodate(page)))
+                return -EUCLEAN;
+
+        ASSERT(memcmp_extent_buffer(eb, fs_info->fsid,
+                        btrfs_header_fsid(), BTRFS_FSID_SIZE) == 0);
+
+        return csum_tree_block(fs_info, eb, 0);
 }
 
 static int check_tree_block_fsid(struct btrfs_fs_info *fs_info,
@@ -661,10 +670,8 @@ static int btree_readpage_end_io_hook(struct btrfs_io_bio *io_bio,
                                        eb, found_level);
 
         ret = csum_tree_block(fs_info, eb, 1);
-        if (ret) {
-                ret = -EIO;
+        if (ret)
                 goto err;
-        }
 
         /*
          * If this is a leaf block and it is corrupt, set the corrupt bit so
@@ -1831,7 +1838,7 @@ static int cleaner_kthread(void *arg)
                  */
                 btrfs_delete_unused_bgs(root->fs_info);
 sleep:
-                if (!try_to_freeze() && !again) {
+                if (!again) {
                         set_current_state(TASK_INTERRUPTIBLE);
                         if (!kthread_should_stop())
                                 schedule();
@@ -1921,14 +1928,12 @@ sleep:
                 if (unlikely(test_bit(BTRFS_FS_STATE_ERROR,
                                       &root->fs_info->fs_state)))
                         btrfs_cleanup_transaction(root);
-                if (!try_to_freeze()) {
-                        set_current_state(TASK_INTERRUPTIBLE);
-                        if (!kthread_should_stop() &&
-                            (!btrfs_transaction_blocked(root->fs_info) ||
-                             cannot_commit))
-                                schedule_timeout(delay);
-                        __set_current_state(TASK_RUNNING);
-                }
+                set_current_state(TASK_INTERRUPTIBLE);
+                if (!kthread_should_stop() &&
+                                (!btrfs_transaction_blocked(root->fs_info) ||
+                                 cannot_commit))
+                        schedule_timeout(delay);
+                __set_current_state(TASK_RUNNING);
         } while (!kthread_should_stop());
         return 0;
 }