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fs: move i_sb_list out from under inode_lock

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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 <dchinner@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Dave Chinner
2011-03-22 22:23:40 +11:00
zatwierdzone przez Al Viro
rodzic f283c86afe
commit 55fa6091d8
6 zmienionych plików z 67 dodań i 56 usunięć
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28
fs/quota/dquot.c
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@@ -76,7 +76,7 @@
#include <linux/buffer_head.h>
#include <linux/capability.h>
#include <linux/quotaops.h>
#include <linux/writeback.h> /* for inode_lock, oddly enough.. */
#include "../internal.h" /* ugh */
#include <asm/uaccess.h>
@@ -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"