lkml.org 
[lkml]   [2009]   [Apr]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[patch 26/27] fs: icache protect inode state
Protect i_hash, i_sb_list etc members with i_lock.
---
fs/hugetlbfs/inode.c | 14 +++++++++-----
fs/inode.c | 30 +++++++++++++++++++++++++++---
2 files changed, 36 insertions(+), 8 deletions(-)

Index: linux-2.6/fs/inode.c
===================================================================
--- linux-2.6.orig/fs/inode.c
+++ linux-2.6/fs/inode.c
@@ -337,12 +337,14 @@ static void dispose_list(struct list_hea
clear_inode(inode);

spin_lock(&inode_lock);
+ spin_lock(&sb_inode_list_lock);
+ spin_lock(&inode->i_lock);
spin_lock(&inode_hash_lock);
hlist_del_init(&inode->i_hash);
spin_unlock(&inode_hash_lock);
- spin_lock(&sb_inode_list_lock);
list_del_init(&inode->i_sb_list);
spin_unlock(&sb_inode_list_lock);
+ spin_unlock(&inode->i_lock);
spin_unlock(&inode_lock);

wake_up_inode(inode);
@@ -640,7 +642,6 @@ __inode_add_to_lists(struct super_block
struct inode *inode)
{
atomic_inc(&inodes_stat.nr_inodes);
- spin_lock(&sb_inode_list_lock);
list_add(&inode->i_sb_list, &sb->s_inodes);
spin_unlock(&sb_inode_list_lock);
spin_lock(&wb_inode_list_lock);
@@ -670,7 +671,10 @@ void inode_add_to_lists(struct super_blo
struct hlist_head *head = inode_hashtable + hash(sb, inode->i_ino);

spin_lock(&inode_lock);
+ spin_lock(&sb_inode_list_lock);
+ spin_lock(&inode->i_lock);
__inode_add_to_lists(sb, head, inode);
+ spin_unlock(&inode->i_lock);
spin_unlock(&inode_lock);
}
EXPORT_SYMBOL_GPL(inode_add_to_lists);
@@ -702,9 +706,12 @@ struct inode *new_inode(struct super_blo
inode = alloc_inode(sb);
if (inode) {
spin_lock(&inode_lock);
+ spin_lock(&sb_inode_list_lock);
+ spin_lock(&inode->i_lock);
inode->i_ino = ++last_ino;
inode->i_state = 0;
__inode_add_to_lists(sb, NULL, inode);
+ spin_unlock(&inode->i_lock);
spin_unlock(&inode_lock);
}
return inode;
@@ -759,11 +766,14 @@ static struct inode * get_new_inode(stru
/* We released the lock, so.. */
old = find_inode(sb, head, test, data);
if (!old) {
+ spin_lock(&sb_inode_list_lock);
+ spin_lock(&inode->i_lock);
if (set(inode, data))
goto set_failed;

inode->i_state = I_LOCK|I_NEW;
__inode_add_to_lists(sb, head, inode);
+ spin_unlock(&inode->i_lock);
spin_unlock(&inode_lock);

/* Return the locked inode with I_NEW set, the
@@ -809,9 +819,12 @@ static struct inode * get_new_inode_fast
/* We released the lock, so.. */
old = find_inode_fast(sb, head, ino);
if (!old) {
+ spin_lock(&sb_inode_list_lock);
+ spin_lock(&inode->i_lock);
inode->i_ino = ino;
inode->i_state = I_LOCK|I_NEW;
__inode_add_to_lists(sb, head, inode);
+ spin_unlock(&inode->i_lock);
spin_unlock(&inode_lock);

/* Return the locked inode with I_NEW set, the
@@ -1137,9 +1150,11 @@ int insert_inode_locked(struct inode *in
spin_lock(&inode_lock);
old = find_inode_fast(sb, head, ino);
if (likely(!old)) {
+ spin_lock(&inode->i_lock);
spin_lock(&inode_hash_lock);
hlist_add_head(&inode->i_hash, head);
spin_unlock(&inode_hash_lock);
+ spin_unlock(&inode->i_lock);
spin_unlock(&inode_lock);
return 0;
}
@@ -1170,9 +1185,11 @@ int insert_inode_locked4(struct inode *i
spin_lock(&inode_lock);
old = find_inode(sb, head, test, data);
if (likely(!old)) {
+ spin_lock(&inode->i_lock);
spin_lock(&inode_hash_lock);
hlist_add_head(&inode->i_hash, head);
spin_unlock(&inode_hash_lock);
+ spin_unlock(&inode->i_lock);
spin_unlock(&inode_lock);
return 0;
}
@@ -1201,10 +1218,13 @@ EXPORT_SYMBOL(insert_inode_locked4);
void __insert_inode_hash(struct inode *inode, unsigned long hashval)
{
struct hlist_head *head = inode_hashtable + hash(inode->i_sb, hashval);
+
spin_lock(&inode_lock);
+ spin_lock(&inode->i_lock);
spin_lock(&inode_hash_lock);
hlist_add_head(&inode->i_hash, head);
spin_unlock(&inode_hash_lock);
+ spin_unlock(&inode->i_lock);
spin_unlock(&inode_lock);
}

@@ -1219,9 +1239,11 @@ EXPORT_SYMBOL(__insert_inode_hash);
void remove_inode_hash(struct inode *inode)
{
spin_lock(&inode_lock);
+ spin_lock(&inode->i_lock);
spin_lock(&inode_hash_lock);
hlist_del_init(&inode->i_hash);
spin_unlock(&inode_hash_lock);
+ spin_unlock(&inode->i_lock);
spin_unlock(&inode_lock);
}

@@ -1270,9 +1292,11 @@ void generic_delete_inode(struct inode *
clear_inode(inode);
}
spin_lock(&inode_lock);
+ spin_lock(&inode->i_lock);
spin_lock(&inode_hash_lock);
hlist_del_init(&inode->i_hash);
spin_unlock(&inode_hash_lock);
+ spin_unlock(&inode->i_lock);
spin_unlock(&inode_lock);
wake_up_inode(inode);
BUG_ON(inode->i_state != I_CLEAR);
@@ -1309,10 +1333,10 @@ static void generic_forget_inode(struct
spin_lock(&inode->i_lock);
WARN_ON(inode->i_state & I_NEW);
inode->i_state &= ~I_WILL_FREE;
- atomic_dec(&inodes_stat.nr_unused);
spin_lock(&inode_hash_lock);
hlist_del_init(&inode->i_hash);
spin_unlock(&inode_hash_lock);
+ atomic_dec(&inodes_stat.nr_unused);
}
spin_lock(&wb_inode_list_lock);
list_del_init(&inode->i_list);
Index: linux-2.6/fs/hugetlbfs/inode.c
===================================================================
--- linux-2.6.orig/fs/hugetlbfs/inode.c
+++ linux-2.6/fs/hugetlbfs/inode.c
@@ -400,12 +400,15 @@ static void hugetlbfs_forget_inode(struc
}
atomic_inc(&inodes_stat.nr_unused);
if (!sb || (sb->s_flags & MS_ACTIVE)) {
+ spin_unlock(&inode->i_lock);
+ spin_unlock(&sb_inode_list_lock);
spin_unlock(&inode_lock);
return;
}
- spin_lock(&inode->i_lock);
+ WARN_ON(inode->i_state & I_NEW);
inode->i_state |= I_WILL_FREE;
spin_unlock(&inode->i_lock);
+ spin_unlock(&sb_inode_list_lock);
spin_unlock(&inode_lock);
/*
* write_inode_now is a noop as we set BDI_CAP_NO_WRITEBACK
@@ -413,27 +416,28 @@ static void hugetlbfs_forget_inode(struc
*/
write_inode_now(inode, 1);
spin_lock(&inode_lock);
+ spin_lock(&sb_inode_list_lock);
spin_lock(&inode->i_lock);
+ WARN_ON(inode->i_state & I_NEW);
inode->i_state &= ~I_WILL_FREE;
spin_lock(&inode_hash_lock);
hlist_del_init(&inode->i_hash);
spin_unlock(&inode_hash_lock);
- spin_unlock(&inode->i_lock);
atomic_dec(&inodes_stat.nr_unused);
}
spin_lock(&wb_inode_list_lock);
list_del_init(&inode->i_list);
spin_unlock(&wb_inode_list_lock);
- spin_lock(&sb_inode_list_lock);
list_del_init(&inode->i_sb_list);
spin_unlock(&sb_inode_list_lock);
- spin_lock(&inode->i_lock);
+ WARN_ON(inode->i_state & I_NEW);
inode->i_state |= I_FREEING;
spin_unlock(&inode->i_lock);
- atomic_dec(&inodes_stat.nr_unused);
spin_unlock(&inode_lock);
+ atomic_dec(&inodes_stat.nr_unused);
truncate_hugepages(inode, 0);
clear_inode(inode);
+ /* XXX: why no wake_up_inode? */
destroy_inode(inode);
}




\
 
 \ /
  Last update: 2009-04-25 03:41    [W:0.227 / U:3.580 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site