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f2fs: avoid race for summary information 

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;
}