Btrfs: set page and mapping error on compressed write failure

If we fail in submit_compressed_extents() before calling btrfs_submit_compressed_write(),
we start and end the writeback for the pages (clear their dirty flag, unlock them, etc)
but we don't tag the pages, nor the inode's mapping, with an error. This makes it
impossible for a caller of filemap_fdatawait_range() (fsync, or transaction commit
for e.g.) know that there was an error.

Note that the return value of submit_compressed_extents() is useless, as that function
is executed by a workqueue task and not directly by the fill_delalloc callback. This
means the writepage/s callbacks of the inode's address space operations don't get that
return value.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>

3 files changed, 8 insertions, 1 deletions

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index bf3f424e0013..420fe26d32d5 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -1746,6 +1746,9 @@ int extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
         if (page_ops == 0)
                 return 0;
 
+        if ((page_ops & PAGE_SET_ERROR) && nr_pages > 0)
+                mapping_set_error(inode->i_mapping, -EIO);
+
         while (nr_pages > 0) {
                 ret = find_get_pages_contig(inode->i_mapping, index,
                                      min_t(unsigned long,
@@ -1763,6 +1766,8 @@ int extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
                                 clear_page_dirty_for_io(pages[i]);
                         if (page_ops & PAGE_SET_WRITEBACK)
                                 set_page_writeback(pages[i]);
+                        if (page_ops & PAGE_SET_ERROR)
+                                SetPageError(pages[i]);
                         if (page_ops & PAGE_END_WRITEBACK)
                                 end_page_writeback(pages[i]);
                         if (page_ops & PAGE_UNLOCK)
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index 6d4b938be986..ece9ce87edff 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -49,6 +49,7 @@
 #define PAGE_SET_WRITEBACK      (1 << 2)
 #define PAGE_END_WRITEBACK      (1 << 3)
 #define PAGE_SET_PRIVATE2       (1 << 4)
+#define PAGE_SET_ERROR          (1 << 5)
 
 /*
  * page->private values.  Every page that is controlled by the extent
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index d23362f4464e..fcb9a38fc9d3 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -832,7 +832,8 @@ out_free:
                                      NULL, EXTENT_LOCKED | EXTENT_DELALLOC |
                                      EXTENT_DEFRAG | EXTENT_DO_ACCOUNTING,
                                      PAGE_UNLOCK | PAGE_CLEAR_DIRTY |
-                                     PAGE_SET_WRITEBACK | PAGE_END_WRITEBACK);
+                                     PAGE_SET_WRITEBACK | PAGE_END_WRITEBACK |
+                                     PAGE_SET_ERROR);
         kfree(async_extent);
         goto again;
 }