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f2fs: don't set cached_en if it will be freed 

If en has empty list pointer, it will be freed sooner, so we don't need to
set cached_en with it.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2016-01-26 09:20:05 -08:00
parent 43a2fa180e
commit 429267442a
1 changed files with 7 additions and 5 deletions
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12
fs/f2fs/extent_cache.c
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@ -243,9 +243,10 @@ static bool f2fs_lookup_extent_tree(struct inode *inode, pgoff_t pgofs,
if (en) {
*ei = en->ei;
spin_lock(&sbi->extent_lock);
if (!list_empty(&en->list))
if (!list_empty(&en->list)) {
list_move_tail(&en->list, &sbi->extent_list);
et->cached_en = en;
et->cached_en = en;
}
spin_unlock(&sbi->extent_lock);
ret = true;
}
@ -364,11 +365,12 @@ static struct extent_node *__try_merge_extent_node(struct f2fs_sb_info *sbi,
return NULL;
__try_update_largest_extent(et, en);
et->cached_en = en;
spin_lock(&sbi->extent_lock);
if (!list_empty(&en->list))
if (!list_empty(&en->list)) {
list_move_tail(&en->list, &sbi->extent_list);
et->cached_en = en;
}
spin_unlock(&sbi->extent_lock);
return en;
}
@ -405,11 +407,11 @@ do_insert:
return NULL;
__try_update_largest_extent(et, en);
et->cached_en = en;
/* update in global extent list */
spin_lock(&sbi->extent_lock);
list_add_tail(&en->list, &sbi->extent_list);
et->cached_en = en;
spin_unlock(&sbi->extent_lock);
return en;
}