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f2fs: stop checkpoint when get a out-of-bounds segment

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There is low probability that an out-of-bounds segment will be got
on a small-capacity device. In order to prevent subsequent write requests
allocating block address from this invalid segment, which may cause
unexpected issue, stop checkpoint should be performed.

Also introduce a new stop cp reason: STOP_CP_REASON_NO_SEGMENT.

Note, f2fs_stop_checkpoint(, false) is complex and it may sleep, so we should
move it outside segmap_lock spinlock coverage in get_new_segment().

Signed-off-by: Zhiguo Niu <zhiguo.niu@unisoc.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Zhiguo Niu 2024-02-20 14:11:24 +08:00 committed by Jaegeuk Kim
parent e24e8333d0
commit f9e28904e6
2 changed files with 12 additions and 1 deletions
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12
fs/f2fs/segment.c
View file

@ -2649,6 +2649,7 @@ static void get_new_segment(struct f2fs_sb_info *sbi,
unsigned int old_zoneno = GET_ZONE_FROM_SEG(sbi, *newseg);
bool init = true;
int i;
int ret = 0;
spin_lock(&free_i->segmap_lock);
@ -2673,7 +2674,10 @@ static void get_new_segment(struct f2fs_sb_info *sbi,
if (secno >= MAIN_SECS(sbi)) {
secno = find_first_zero_bit(free_i->free_secmap,
MAIN_SECS(sbi));
f2fs_bug_on(sbi, secno >= MAIN_SECS(sbi));
if (secno >= MAIN_SECS(sbi)) {
ret = -ENOSPC;
goto out_unlock;
}
}
segno = GET_SEG_FROM_SEC(sbi, secno);
zoneno = GET_ZONE_FROM_SEC(sbi, secno);
@ -2703,7 +2707,13 @@ static void get_new_segment(struct f2fs_sb_info *sbi,
f2fs_bug_on(sbi, test_bit(segno, free_i->free_segmap));
__set_inuse(sbi, segno);
*newseg = segno;
out_unlock:
spin_unlock(&free_i->segmap_lock);
if (ret) {
f2fs_stop_checkpoint(sbi, false, STOP_CP_REASON_NO_SEGMENT);
f2fs_bug_on(sbi, 1);
}
}
static void reset_curseg(struct f2fs_sb_info *sbi, int type, int modified)

1
include/linux/f2fs_fs.h
View file

@ -75,6 +75,7 @@ enum stop_cp_reason {
STOP_CP_REASON_CORRUPTED_SUMMARY,
STOP_CP_REASON_UPDATE_INODE,
STOP_CP_REASON_FLUSH_FAIL,
STOP_CP_REASON_NO_SEGMENT,
STOP_CP_REASON_MAX,
};