Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=d003fb70fd356d0684ee0cd37a785e058c8678de
Commit: d003fb70fd356d0684ee0cd37a785e058c8678de
Parent: fb58b7316a99703afb8d076b0e5f3e1e387e4b30
Author: Christoph Hellwig <[EMAIL PROTECTED]>
AuthorDate: Mon Feb 12 00:51:58 2007 -0800
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Mon Feb 12 09:48:28 2007 -0800
[PATCH] remove sb->s_files and file_list_lock usage in dquot.c
Iterate over sb->s_inodes instead of sb->s_files in add_dquot_ref. This
reduces list search and lock hold time aswell as getting rid of one of the
few uses of file_list_lock which Ingo identified as a scalability problem.
Previously we called dq_op->initialize for every inode handing of a
writeable file that wasn't initialized before. Now we're calling it for
every inode that has a non-zero i_writecount, aka a writeable file
descriptor refering to it.
Thanks a lot to Jan Kara for running this patch through his quota test
harness.
Signed-off-by: Christoph Hellwig <[EMAIL PROTECTED]>
Signed-off-by: Jan Kara <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
fs/dquot.c | 32 ++++++++++++++++++--------------
1 files changed, 18 insertions(+), 14 deletions(-)
diff --git a/fs/dquot.c b/fs/dquot.c
index 5bdc4b2..9eb166f 100644
--- a/fs/dquot.c
+++ b/fs/dquot.c
@@ -688,23 +688,27 @@ static int dqinit_needed(struct inode *inode, int type)
/* This routine is guarded by dqonoff_mutex mutex */
static void add_dquot_ref(struct super_block *sb, int type)
{
- struct list_head *p;
+ struct inode *inode;
restart:
- file_list_lock();
- list_for_each(p, &sb->s_files) {
- struct file *filp = list_entry(p, struct file, f_u.fu_list);
- struct inode *inode = filp->f_path.dentry->d_inode;
- if (filp->f_mode & FMODE_WRITE && dqinit_needed(inode, type)) {
- struct dentry *dentry = dget(filp->f_path.dentry);
- file_list_unlock();
- sb->dq_op->initialize(inode, type);
- dput(dentry);
- /* As we may have blocked we had better restart... */
- goto restart;
- }
+ spin_lock(&inode_lock);
+ list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
+ if (!atomic_read(&inode->i_writecount))
+ continue;
+ if (!dqinit_needed(inode, type))
+ continue;
+ if (inode->i_state & (I_FREEING|I_WILL_FREE))
+ continue;
+
+ __iget(inode);
+ spin_unlock(&inode_lock);
+
+ sb->dq_op->initialize(inode, type);
+ iput(inode);
+ /* As we may have blocked we had better restart... */
+ goto restart;
}
- file_list_unlock();
+ spin_unlock(&inode_lock);
}
/* Return 0 if dqput() won't block (note that 1 doesn't necessarily mean
blocking) */
-
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