From 5a3cd99285dc793a4022fa75ceeb323eb6d29ac9 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Wed, 6 Nov 2013 09:54:52 -0500
Subject: [PATCH] iget/iget5: don't bother with ->i_lock until we find a match
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
Documentation/filesystems/porting | 8 ++++++++
drivers/staging/lustre/lustre/llite/namei.c | 2 +-
fs/inode.c | 20 ++++++--------------
fs/ntfs/inode.c | 2 +-
4 files changed, 16 insertions(+), 16 deletions(-)
diff --git a/Documentation/filesystems/porting b/Documentation/filesystems/porting
index f0890581f7f6..fe2b7ae6f962 100644
--- a/Documentation/filesystems/porting
+++ b/Documentation/filesystems/porting
@@ -455,3 +455,11 @@ in your dentry operations instead.
vfs_follow_link has been removed. Filesystems must use nd_set_link
from ->follow_link for normal symlinks, or nd_jump_link for magic
/proc/<pid> style links.
+--
+[mandatory]
+ iget5_locked()/ilookup5()/ilookup5_nowait() test() callback used to be
+ called with both ->i_lock and inode_hash_lock held; the former is *not*
+ taken anymore, so verify that your callbacks do not rely on it (none
+ of the in-tree instances did). inode_hash_lock is still held,
+ of course, so they are still serialized wrt removal from inode hash,
+ as well as wrt set() callback of iget5_locked().
diff --git a/drivers/staging/lustre/lustre/llite/namei.c b/drivers/staging/lustre/lustre/llite/namei.c
index 34815b550e71..90bbdae824ac 100644
--- a/drivers/staging/lustre/lustre/llite/namei.c
+++ b/drivers/staging/lustre/lustre/llite/namei.c
@@ -83,7 +83,7 @@ int ll_unlock(__u32 mode, struct lustre_handle *lockh)
}
-/* called from iget5_locked->find_inode() under inode_lock spinlock */
+/* called from iget5_locked->find_inode() under inode_hash_lock spinlock */
static int ll_test_inode(struct inode *inode, void *opaque)
{
struct ll_inode_info *lli = ll_i2info(inode);
diff --git a/fs/inode.c b/fs/inode.c
index b33ba8e021cc..bf7a8b3ab937 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -773,15 +773,11 @@ static struct inode *find_inode(struct super_block *sb,
repeat:
hlist_for_each_entry(inode, head, i_hash) {
- spin_lock(&inode->i_lock);
- if (inode->i_sb != sb) {
- spin_unlock(&inode->i_lock);
+ if (inode->i_sb != sb)
continue;
- }
- if (!test(inode, data)) {
- spin_unlock(&inode->i_lock);
+ if (!test(inode, data))
continue;
- }
+ spin_lock(&inode->i_lock);
if (inode->i_state & (I_FREEING|I_WILL_FREE)) {
__wait_on_freeing_inode(inode);
goto repeat;
@@ -804,15 +800,11 @@ static struct inode *find_inode_fast(struct super_block *sb,
repeat:
hlist_for_each_entry(inode, head, i_hash) {
- spin_lock(&inode->i_lock);
- if (inode->i_ino != ino) {
- spin_unlock(&inode->i_lock);
+ if (inode->i_ino != ino)
continue;
- }
- if (inode->i_sb != sb) {
- spin_unlock(&inode->i_lock);
+ if (inode->i_sb != sb)
continue;
- }
+ spin_lock(&inode->i_lock);
if (inode->i_state & (I_FREEING|I_WILL_FREE)) {
__wait_on_freeing_inode(inode);
goto repeat;
diff --git a/fs/ntfs/inode.c b/fs/ntfs/inode.c
index 2778b0255dc6..ffb9b3675736 100644
--- a/fs/ntfs/inode.c
+++ b/fs/ntfs/inode.c
@@ -55,7 +55,7 @@
*
* Return 1 if the attributes match and 0 if not.
*
- * NOTE: This function runs with the inode->i_lock spin lock held so it is not
+ * NOTE: This function runs with the inode_hash_lock spin lock held so it is not
* allowed to sleep.
*/
int ntfs_test_inode(struct inode *vi, ntfs_attr *na)
--
2.34.1