Merge tag 'socfpga_defconfig_updates_for_v4.8' of git://git.kernel.org/pub/scm/linux...

[cascardo/linux.git] / fs / btrfs / extent_io.c

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 3cd5782..a3412d6 100644 (file)
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2025,9 +2025,16 @@ int repair_io_failure(struct inode *inode, u64 start, u64 length, u64 logical,
        bio->bi_iter.bi_size = 0;
        map_length = length;
 
+       /*
+        * Avoid races with device replace and make sure our bbio has devices
+        * associated to its stripes that don't go away while we are doing the
+        * read repair operation.
+        */
+       btrfs_bio_counter_inc_blocked(fs_info);
        ret = btrfs_map_block(fs_info, WRITE, logical,
                              &map_length, &bbio, mirror_num);
        if (ret) {
+               btrfs_bio_counter_dec(fs_info);
                bio_put(bio);
                return -EIO;
        }
@@ -2037,6 +2044,7 @@ int repair_io_failure(struct inode *inode, u64 start, u64 length, u64 logical,
        dev = bbio->stripes[mirror_num-1].dev;
        btrfs_put_bbio(bbio);
        if (!dev || !dev->bdev || !dev->writeable) {
+               btrfs_bio_counter_dec(fs_info);
                bio_put(bio);
                return -EIO;
        }
@@ -2045,6 +2053,7 @@ int repair_io_failure(struct inode *inode, u64 start, u64 length, u64 logical,
 
        if (btrfsic_submit_bio_wait(WRITE_SYNC, bio)) {
                /* try to remap that extent elsewhere? */
+               btrfs_bio_counter_dec(fs_info);
                bio_put(bio);
                btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS);
                return -EIO;
@@ -2054,6 +2063,7 @@ int repair_io_failure(struct inode *inode, u64 start, u64 length, u64 logical,
                "read error corrected: ino %llu off %llu (dev %s sector %llu)",
                                  btrfs_ino(inode), start,
                                  rcu_str_deref(dev->name), sector);
+       btrfs_bio_counter_dec(fs_info);
        bio_put(bio);
        return 0;
 }
@@ -4718,16 +4728,16 @@ err:
 }
 
 struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
-                                               u64 start)
+                                               u64 start, u32 nodesize)
 {
        unsigned long len;
 
        if (!fs_info) {
                /*
                 * Called only from tests that don't always have a fs_info
-                * available, but we know that nodesize is 4096
+                * available
                 */
-               len = 4096;
+               len = nodesize;
        } else {
                len = fs_info->tree_root->nodesize;
        }
@@ -4823,7 +4833,7 @@ struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
 
 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
 struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
-                                              u64 start)
+                                       u64 start, u32 nodesize)
 {
        struct extent_buffer *eb, *exists = NULL;
        int ret;
@@ -4831,7 +4841,7 @@ struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
        eb = find_extent_buffer(fs_info, start);
        if (eb)
                return eb;
-       eb = alloc_dummy_extent_buffer(fs_info, start);
+       eb = alloc_dummy_extent_buffer(fs_info, start, nodesize);
        if (!eb)
                return NULL;
        eb->fs_info = fs_info;