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authorLiu Bo <bo.li.liu@oracle.com>2016-06-04 00:41:42 (GMT)
committerDavid Sterba <dsterba@suse.com>2016-06-06 08:14:40 (GMT)
commitd865177a5e749827f248f6363f5100d3a2f66b0f (patch)
tree2c5b0d1c16e2e64f406b309926b176f4458dc599 /fs
parent65d4f4c151a5fa7b2dacaaf70def3f95001766d7 (diff)
downloadlinux-d865177a5e749827f248f6363f5100d3a2f66b0f.tar.xz
Btrfs: clear uptodate flags of pages in sys_array eb
We set uptodate flag to pages in the temporary sys_array eb, but do not clear the flag after free eb. As the special btree inode may still hold a reference on those pages, the uptodate flag can remain alive in them. If btrfs_super_chunk_root has been intentionally changed to the offset of this sys_array eb, reading chunk_root will read content of sys_array and it will skip our beautiful checks in btree_readpage_end_io_hook() because of "pages of eb are uptodate => eb is uptodate" This adds the 'clear uptodate' part to force it to read from disk. Reviewed-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/volumes.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 673c72a..42ccde4 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -6631,12 +6631,14 @@ int btrfs_read_sys_array(struct btrfs_root *root)
sb_array_offset += len;
cur_offset += len;
}
+ clear_extent_buffer_uptodate(sb);
free_extent_buffer_stale(sb);
return ret;
out_short_read:
printk(KERN_ERR "BTRFS: sys_array too short to read %u bytes at offset %u\n",
len, cur_offset);
+ clear_extent_buffer_uptodate(sb);
free_extent_buffer_stale(sb);
return -EIO;
}