Commit d865177a authored by Liu Bo's avatar Liu Bo Committed by David Sterba
Browse files

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: default avatarJosef Bacik <>
Signed-off-by: default avatarLiu Bo <>
Signed-off-by: default avatarDavid Sterba <>
parent 65d4f4c1
......@@ -6631,12 +6631,14 @@ int btrfs_read_sys_array(struct btrfs_root *root)
sb_array_offset += len;
cur_offset += len;
return ret;
printk(KERN_ERR "BTRFS: sys_array too short to read %u bytes at offset %u\n",
len, cur_offset);
return -EIO;
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