[PATCH v3 5/8] add mirror_num to extent_read_full_page

[Jan Schmidt]

Currently, extent_read_full_page always assumes we are trying to read mirror
0, which generally is the best we can do. To add flexibility, pass it as a
parameter. This will be needed by scrub fixup code.

Signed-off-by: Jan Schmidt <list.bt...@jan-o-sch.net>
---
 fs/btrfs/disk-io.c   |    2 +-
 fs/btrfs/extent_io.c |    6 +++---
 fs/btrfs/extent_io.h |    2 +-
 fs/btrfs/inode.c     |    2 +-
 4 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 1ac8db5d..b898319 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -874,7 +874,7 @@ static int btree_readpage(struct file *file, struct page 
*page)
 {
        struct extent_io_tree *tree;
        tree = &BTRFS_I(page->mapping->host)->io_tree;
-       return extent_read_full_page(tree, page, btree_get_extent);
+       return extent_read_full_page(tree, page, btree_get_extent, 0);
 }
 
 static int btree_releasepage(struct page *page, gfp_t gfp_flags)
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index b181a94..b78f665 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2111,16 +2111,16 @@ static int __extent_read_full_page(struct 
extent_io_tree *tree,
 }
 
 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
-                           get_extent_t *get_extent)
+                           get_extent_t *get_extent, int mirror_num)
 {
        struct bio *bio = NULL;
        unsigned long bio_flags = 0;
        int ret;
 
-       ret = __extent_read_full_page(tree, page, get_extent, &bio, 0,
+       ret = __extent_read_full_page(tree, page, get_extent, &bio, mirror_num,
                                      &bio_flags);
        if (bio)
-               ret = submit_one_bio(READ, bio, 0, bio_flags);
+               ret = submit_one_bio(READ, bio, mirror_num, bio_flags);
        return ret;
 }
 
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index a11a92e..22bf366 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -177,7 +177,7 @@ int unlock_extent_cached(struct extent_io_tree *tree, u64 
start, u64 end,
 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
                    gfp_t mask);
 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
-                         get_extent_t *get_extent);
+                         get_extent_t *get_extent, int mirror_num);
 int __init extent_io_init(void);
 void extent_io_exit(void);
 
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 447612d..18c3a3f 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -6248,7 +6248,7 @@ int btrfs_readpage(struct file *file, struct page *page)
 {
        struct extent_io_tree *tree;
        tree = &BTRFS_I(page->mapping->host)->io_tree;
-       return extent_read_full_page(tree, page, btrfs_get_extent);
+       return extent_read_full_page(tree, page, btrfs_get_extent, 0);
 }
 
 static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
-- 
1.7.3.4

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