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f2fs: avoid race for summary information

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In order to do GC more reliably, I'd like to lock the vicitm summary page
until its GC is completed, and also prevent any checkpoint process.

Reviewed-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
This commit is contained in:
Jaegeuk Kim 2013-04-01 08:32:21 +09:00
parent 60374688a1
commit b74737541c
3 changed files with 7 additions and 10 deletions
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8
fs/f2fs/gc.c
View file

@ -642,12 +642,6 @@ static void do_garbage_collect(struct f2fs_sb_info *sbi, unsigned int segno,
if (IS_ERR(sum_page))
return;
/*
* CP needs to lock sum_page. In this time, we don't need
* to lock this page, because this summary page is not gone anywhere.
* Also, this page is not gonna be updated before GC is done.
*/
unlock_page(sum_page);
sum = page_address(sum_page);
switch (GET_SUM_TYPE((&sum->footer))) {
@ -661,7 +655,7 @@ static void do_garbage_collect(struct f2fs_sb_info *sbi, unsigned int segno,
stat_inc_seg_count(sbi, GET_SUM_TYPE((&sum->footer)));
stat_inc_call_count(sbi->stat_info);
f2fs_put_page(sum_page, 0);
f2fs_put_page(sum_page, 1);
}
int f2fs_gc(struct f2fs_sb_info *sbi)

2
fs/f2fs/node.c
View file

@ -1149,7 +1149,7 @@ static int f2fs_write_node_pages(struct address_space *mapping,
/* First check balancing cached NAT entries */
if (try_to_free_nats(sbi, NAT_ENTRY_PER_BLOCK)) {
write_checkpoint(sbi, false);
f2fs_sync_fs(sbi->sb, true);
return 0;
}

7
fs/f2fs/super.c
View file

@ -137,10 +137,13 @@ int f2fs_sync_fs(struct super_block *sb, int sync)
if (!sbi->s_dirty && !get_pages(sbi, F2FS_DIRTY_NODES))
return 0;
if (sync)
if (sync) {
mutex_lock(&sbi->gc_mutex);
write_checkpoint(sbi, false);
else
mutex_unlock(&sbi->gc_mutex);
} else {
f2fs_balance_fs(sbi);
}
return 0;
}