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authorChao Yu <yuchao0@huawei.com>2017-11-02 20:41:03 +0800
committerJaegeuk Kim <jaegeuk@kernel.org>2017-11-05 16:42:08 -0800
commit2b60311dd1ae80d061b17a38e0a4d7f4eb558a17 (patch)
tree9f2d70d030067b3dee5649d9a5b5f90e8e1a1015 /fs/f2fs
parent0537b8115387f0b032472037d19e3025f8733ef7 (diff)
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f2fs: fix summary info corruption
Sometimes, after running generic/270 of fstest, fsck reports summary info and actual position of block address in direct node becoming inconsistent. The root cause is race in between __f2fs_replace_block and change_curseg as below: Thread A Thread B - __clone_blkaddrs - f2fs_replace_block - __f2fs_replace_block - segnoA = GET_SEGNO(sbi, blkaddrA); - type = se->type:=CURSEG_HOT_DATA - if (!IS_CURSEG(sbi, segnoA)) type = CURSEG_WARM_DATA - allocate_data_block - allocate_segment - get_ssr_segment - change_curseg(segnoA, CURSEG_HOT_DATA) - change_curseg(segnoA, CURSEG_WARM_DATA) - reset_curseg - __set_sit_entry_type - change se->type from CURSEG_HOT_DATA to CURSEG_WARM_DATA So finally, hot curseg locates in segnoA, but type of segnoA becomes CURSEG_WARM_DATA. Then if we invoke __f2fs_replace_block(blkaddrB, blkaddrA, true, false), as blkaddrA locates in segnoA, so we will move warm type curseg to segnoA, then change its summary cache and writeback it to summary block. But segnoA is used by hot type curseg too, once it moves or persist, it will cover summary block content with inner old summary cache, result in inconsistent status. This patch tries to fix this issue by introduce global curseg lock to avoid race in between __f2fs_replace_block and change_curseg. Signed-off-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs')
-rw-r--r--fs/f2fs/f2fs.h2
-rw-r--r--fs/f2fs/segment.c28
2 files changed, 29 insertions, 1 deletions
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 484b5c6ac36b..cc46c22192ee 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -820,6 +820,8 @@ struct f2fs_sm_info {
struct dirty_seglist_info *dirty_info; /* dirty segment information */
struct curseg_info *curseg_array; /* active segment information */
+ struct rw_semaphore curseg_lock; /* for preventing curseg change */
+
block_t seg0_blkaddr; /* block address of 0'th segment */
block_t main_blkaddr; /* start block address of main area */
block_t ssa_blkaddr; /* start block address of SSA area */
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 5789d2e622ac..20722b24f801 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -2512,6 +2512,8 @@ void allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
struct sit_info *sit_i = SIT_I(sbi);
struct curseg_info *curseg = CURSEG_I(sbi, type);
+ down_read(&SM_I(sbi)->curseg_lock);
+
mutex_lock(&curseg->curseg_mutex);
down_write(&sit_i->sentry_lock);
@@ -2569,6 +2571,8 @@ void allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
}
mutex_unlock(&curseg->curseg_mutex);
+
+ up_read(&SM_I(sbi)->curseg_lock);
}
static void update_device_state(struct f2fs_io_info *fio)
@@ -2676,6 +2680,18 @@ int rewrite_data_page(struct f2fs_io_info *fio)
return err;
}
+static inline int __f2fs_get_curseg(struct f2fs_sb_info *sbi,
+ unsigned int segno)
+{
+ int i;
+
+ for (i = CURSEG_HOT_DATA; i < NO_CHECK_TYPE; i++) {
+ if (CURSEG_I(sbi, i)->segno == segno)
+ break;
+ }
+ return i;
+}
+
void __f2fs_replace_block(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
block_t old_blkaddr, block_t new_blkaddr,
bool recover_curseg, bool recover_newaddr)
@@ -2691,6 +2707,8 @@ void __f2fs_replace_block(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
se = get_seg_entry(sbi, segno);
type = se->type;
+ down_write(&SM_I(sbi)->curseg_lock);
+
if (!recover_curseg) {
/* for recovery flow */
if (se->valid_blocks == 0 && !IS_CURSEG(sbi, segno)) {
@@ -2700,8 +2718,13 @@ void __f2fs_replace_block(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
type = CURSEG_WARM_DATA;
}
} else {
- if (!IS_CURSEG(sbi, segno))
+ if (IS_CURSEG(sbi, segno)) {
+ /* se->type is volatile as SSR allocation */
+ type = __f2fs_get_curseg(sbi, segno);
+ f2fs_bug_on(sbi, type == NO_CHECK_TYPE);
+ } else {
type = CURSEG_WARM_DATA;
+ }
}
curseg = CURSEG_I(sbi, type);
@@ -2741,6 +2764,7 @@ void __f2fs_replace_block(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
up_write(&sit_i->sentry_lock);
mutex_unlock(&curseg->curseg_mutex);
+ up_write(&SM_I(sbi)->curseg_lock);
}
void f2fs_replace_block(struct f2fs_sb_info *sbi, struct dnode_of_data *dn,
@@ -3678,6 +3702,8 @@ int build_segment_manager(struct f2fs_sb_info *sbi)
INIT_LIST_HEAD(&sm_info->sit_entry_set);
+ init_rwsem(&sm_info->curseg_lock);
+
if (!f2fs_readonly(sbi->sb)) {
err = create_flush_cmd_control(sbi);
if (err)