From 55fa6091d83160ca772fc37cebae45d42695a708 Mon Sep 17 00:00:00 2001 From: Dave Chinner Date: Tue, 22 Mar 2011 22:23:40 +1100 Subject: fs: move i_sb_list out from under inode_lock Protect the per-sb inode list with a new global lock inode_sb_list_lock and use it to protect the list manipulations and traversals. This lock replaces the inode_lock as the inodes on the list can be validity checked while holding the inode->i_lock and hence the inode_lock is no longer needed to protect the list. Signed-off-by: Dave Chinner Signed-off-by: Al Viro --- fs/quota/dquot.c | 28 ++++++++++++++++------------ 1 file changed, 16 insertions(+), 12 deletions(-) (limited to 'fs/quota/dquot.c') diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c index a1470fda366c..fcc8ae75d874 100644 --- a/fs/quota/dquot.c +++ b/fs/quota/dquot.c @@ -76,7 +76,7 @@ #include #include #include -#include /* for inode_lock, oddly enough.. */ +#include "../internal.h" /* ugh */ #include @@ -900,7 +900,7 @@ static void add_dquot_ref(struct super_block *sb, int type) int reserved = 0; #endif - spin_lock(&inode_lock); + spin_lock(&inode_sb_list_lock); list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { spin_lock(&inode->i_lock); if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) || @@ -915,19 +915,23 @@ static void add_dquot_ref(struct super_block *sb, int type) #endif __iget(inode); spin_unlock(&inode->i_lock); - spin_unlock(&inode_lock); + spin_unlock(&inode_sb_list_lock); iput(old_inode); __dquot_initialize(inode, type); - /* We hold a reference to 'inode' so it couldn't have been - * removed from s_inodes list while we dropped the inode_lock. - * We cannot iput the inode now as we can be holding the last - * reference and we cannot iput it under inode_lock. So we - * keep the reference and iput it later. */ + + /* + * We hold a reference to 'inode' so it couldn't have been + * removed from s_inodes list while we dropped the + * inode_sb_list_lock We cannot iput the inode now as we can be + * holding the last reference and we cannot iput it under + * inode_sb_list_lock. So we keep the reference and iput it + * later. + */ old_inode = inode; - spin_lock(&inode_lock); + spin_lock(&inode_sb_list_lock); } - spin_unlock(&inode_lock); + spin_unlock(&inode_sb_list_lock); iput(old_inode); #ifdef CONFIG_QUOTA_DEBUG @@ -1008,7 +1012,7 @@ static void remove_dquot_ref(struct super_block *sb, int type, struct inode *inode; int reserved = 0; - spin_lock(&inode_lock); + spin_lock(&inode_sb_list_lock); list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { /* * We have to scan also I_NEW inodes because they can already @@ -1022,7 +1026,7 @@ static void remove_dquot_ref(struct super_block *sb, int type, remove_inode_dquot_ref(inode, type, tofree_head); } } - spin_unlock(&inode_lock); + spin_unlock(&inode_sb_list_lock); #ifdef CONFIG_QUOTA_DEBUG if (reserved) { printk(KERN_WARNING "VFS (%s): Writes happened after quota" -- cgit v1.2.3