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vfs: skip inodes without pages to free in drop_pagecache_sb()

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Many inodes have no pagecache, so we can avoid lots of lock-takings.

Signed-off-by: Jan Kara <jack@suse.cz>
Cc: Fengguang Wu <wfg@mail.ustc.edu.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jan Kara 2008-04-29 00:59:39 -07:00 committed by Linus Torvalds
parent eccb95cee4
commit af065b8a19
1 changed files with 2 additions and 0 deletions
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2
fs/drop_caches.c
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@ -20,6 +20,8 @@ static void drop_pagecache_sb(struct super_block *sb)
list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
if (inode->i_state & (I_FREEING|I_WILL_FREE))
continue;
if (inode->i_mapping->nrpages == 0)
continue;
__iget(inode);
spin_unlock(&inode_lock);
__invalidate_mapping_pages(inode->i_mapping, 0, -1, true);