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| author | Liu Bo <bo.li.liu@oracle.com> | 2016-07-19 15:36:05 -0700 |
|---|---|---|
| committer | Chris Mason <clm@fb.com> | 2016-08-25 03:58:15 -0700 |
| commit | 1c1ea4f781db9f754842b9c31d1eff400d17cddc (patch) | |
| tree | 7e14ac7f74054a5d5912b2fd0db38abcf73e9a4d /fs/btrfs | |
| parent | 10838816547a28696ca10e038b3b32f2efec5a42 (diff) | |
| download | linux-1c1ea4f781db9f754842b9c31d1eff400d17cddc.tar.gz | |
Btrfs: fix memory leak of reloc_root
When some critical errors occur and FS would be flipped into RO, if we have an on-going balance, we can end up with a memory leak of root->reloc_root since btrfs_drop_snapshots() bails out without freeing reloc_root at the very early start. However, we're not able to free reloc_root in btrfs_drop_snapshots() because its caller, merge_reloc_roots(), still needs to access it to cleanup reloc_root's rbtree. This makes us free reloc_root when we're going to free fs/file roots. Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs/btrfs')
| -rw-r--r-- | fs/btrfs/disk-io.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index ff2362dca91a..4a34c9fcc1a7 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -3744,8 +3744,15 @@ void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info, if (btrfs_root_refs(&root->root_item) == 0) synchronize_srcu(&fs_info->subvol_srcu); - if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) + if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) { btrfs_free_log(NULL, root); + if (root->reloc_root) { + free_extent_buffer(root->reloc_root->node); + free_extent_buffer(root->reloc_root->commit_root); + btrfs_put_fs_root(root->reloc_root); + root->reloc_root = NULL; + } + } if (root->free_ino_pinned) __btrfs_remove_free_space_cache(root->free_ino_pinned); |