diff options
| author | Qu Wenruo <wqu@suse.com> | 2021-01-26 11:33:51 +0300 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2021-02-09 00:59:02 +0300 |
| commit | 09bc1f0fb845a6435e2c6c5d3c937f7a674e816a (patch) | |
| tree | 9d673ab096470357f596a30ae5d0471ab7cca20d | |
| parent | 8ff8466d29efc226648c3c5e57590428d798a6ea (diff) | |
| download | linux-09bc1f0fb845a6435e2c6c5d3c937f7a674e816a.tar.xz | |
btrfs: attach private to dummy extent buffer pages
There are locations where we allocate dummy extent buffers for temporary
usage, like in tree_mod_log_rewind() or get_old_root().
These dummy extent buffers will be handled by the same eb accessors, and
if they don't have page::private subpage eb accessors could fail.
To address such problems, make __alloc_dummy_extent_buffer() attach
page private for dummy extent buffers too.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
| -rw-r--r-- | fs/btrfs/extent_io.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 1812813bdf63..b8ff05916b8f 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -5185,9 +5185,14 @@ struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info, num_pages = num_extent_pages(eb); for (i = 0; i < num_pages; i++) { + int ret; + eb->pages[i] = alloc_page(GFP_NOFS); if (!eb->pages[i]) goto err; + ret = attach_extent_buffer_page(eb, eb->pages[i], NULL); + if (ret < 0) + goto err; } set_extent_buffer_uptodate(eb); btrfs_set_header_nritems(eb, 0); @@ -5195,8 +5200,10 @@ struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info, return eb; err: - for (; i > 0; i--) + for (; i > 0; i--) { + detach_extent_buffer_page(eb, eb->pages[i - 1]); __free_page(eb->pages[i - 1]); + } __free_extent_buffer(eb); return NULL; } |