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| author |   Yunlei He <heyunlei@huawei.com> | 2016-07-22 19:08:31 +0800 |
|---|---|---|
| committer |   Jaegeuk Kim <jaegeuk@kernel.org> | 2016-07-22 11:55:31 -0700 |
| commit | fe94793e555f650fab656649521fc38aaab4874e (patch) | |
| tree | 3eda71fb06e91cf9cb5712e89e9dd950fe5bd11a /fs/f2fs/gc.c | |
| parent | f2fs: handle error case with f2fs_bug_on (diff) | |
| download | linux-dev-fe94793e555f650fab656649521fc38aaab4874e.tar.xz linux-dev-fe94793e555f650fab656649521fc38aaab4874e.zip | |
f2fs: get victim segment again after new cp
Previous selected segment may become free after write_checkpoint,
if we do garbage collect on this segment, and then new_curseg happen
to reuse it, it may cause f2fs_bug_on as below.
panic+0x154/0x29c
do_garbage_collect+0x15c/0xaf4
f2fs_gc+0x2dc/0x444
f2fs_balance_fs.part.22+0xcc/0x14c
f2fs_balance_fs+0x28/0x34
f2fs_map_blocks+0x5ec/0x790
f2fs_preallocate_blocks+0xe0/0x100
f2fs_file_write_iter+0x64/0x11c
new_sync_write+0xac/0x11c
vfs_write+0x144/0x1e4
SyS_write+0x60/0xc0
Here, maybe we check sit and ssa type during reset_curseg. So, we check
segment is stale or not, and select a new victim to avoid this.
Signed-off-by: Yunlei He <heyunlei@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/gc.c')
| -rw-r--r-- | fs/f2fs/gc.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c index de6c41c32c62..06cfb94cc3db 100644 --- a/fs/f2fs/gc.c +++ b/fs/f2fs/gc.c @@ -908,10 +908,13 @@ gc_more: * enough free sections, we should flush dent/node blocks and do * garbage collections. */ - if (__get_victim(sbi, &segno, gc_type) || prefree_segments(sbi)) + if (__get_victim(sbi, &segno, gc_type) || + prefree_segments(sbi)) { write_checkpoint(sbi, &cpc); - else if (has_not_enough_free_secs(sbi, 0)) + segno = NULL_SEGNO; + } else if (has_not_enough_free_secs(sbi, 0)) { write_checkpoint(sbi, &cpc); + } } if (segno == NULL_SEGNO && !__get_victim(sbi, &segno, gc_type)) |