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direct-io: Implement generic deferred AIO completions

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Add support to the core direct-io code to defer AIO completions to user
context using a workqueue.  This replaces opencoded and less efficient
code in XFS and ext4 (we save a memory allocation for each direct IO)
and will be needed to properly support O_(D)SYNC for AIO.

The communication between the filesystem and the direct I/O code requires
a new buffer head flag, which is a bit ugly but not avoidable until the
direct I/O code stops abusing the buffer_head structure for communicating
with the filesystems.

Currently this creates a per-superblock unbound workqueue for these
completions, which is taken from an earlier patch by Jan Kara.  I'm
not really convinced about this use and would prefer a "normal" global
workqueue with a high concurrency limit, but this needs further discussion.

JK: Fixed ext4 part, dynamic allocation of the workqueue.

Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Jan Kara <[email protected]>
Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Christoph Hellwig 2013-09-04 15:04:39 +02:00 • committed by Al Viro
commit 7b7a8665ed
11 changed files with 105 additions and 131 deletions
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18
fs/super.c
View file

@ -152,15 +152,9 @@ static struct super_block *alloc_super(struct file_system_type *type, int flags)
static const struct super_operations default_op;
if (s) {
if (security_sb_alloc(s)) {
/*
* We cannot call security_sb_free() without
* security_sb_alloc() succeeding. So bail out manually
*/
kfree(s);
s = NULL;
goto out;
}
if (security_sb_alloc(s))
goto out_free_sb;
#ifdef CONFIG_SMP
s->s_files = alloc_percpu(struct list_head);
if (!s->s_files)
@ -228,6 +222,7 @@ err_out:
free_percpu(s->s_files);
#endif
destroy_sb_writers(s);
out_free_sb:
kfree(s);
s = NULL;
goto out;
@ -414,6 +409,11 @@ void generic_shutdown_super(struct super_block *sb)
evict_inodes(sb);
if (sb->s_dio_done_wq) {
destroy_workqueue(sb->s_dio_done_wq);
sb->s_dio_done_wq = NULL;
}
if (sop->put_super)
sop->put_super(sb);