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xfs: remove i_iocount

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We now have an i_dio_count filed and surrounding infrastructure to wait
for direct I/O completion instead of i_icount, and we have never needed
to iocount waits for buffered I/O given that we only set the page uptodate
after finishing all required work.  Thus remove i_iocount, and replace
the actually needed waits with calls to inode_dio_wait.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Christoph Hellwig 2011-08-23 08:28:13 +00:00 • committed by Alex Elder
parent 2b3ffd7eb7
commit 4a06fd262d
9 changed files with 9 additions and 67 deletions
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39
fs/xfs/xfs_aops.c
View file

@ -38,40 +38,6 @@
#include <linux/pagevec.h>
#include <linux/writeback.h>
/*
* Prime number of hash buckets since address is used as the key.
*/
#define NVSYNC 37
#define to_ioend_wq(v) (&xfs_ioend_wq[((unsigned long)v) % NVSYNC])
static wait_queue_head_t xfs_ioend_wq[NVSYNC];
void __init
xfs_ioend_init(void)
{
int i;
for (i = 0; i < NVSYNC; i++)
init_waitqueue_head(&xfs_ioend_wq[i]);
}
void
xfs_ioend_wait(
xfs_inode_t *ip)
{
wait_queue_head_t *wq = to_ioend_wq(ip);
wait_event(*wq, (atomic_read(&ip->i_iocount) == 0));
}
STATIC void
xfs_ioend_wake(
xfs_inode_t *ip)
{
if (atomic_dec_and_test(&ip->i_iocount))
wake_up(to_ioend_wq(ip));
}
void
xfs_count_page_state(
struct page *page,
@ -115,7 +81,6 @@ xfs_destroy_ioend(
xfs_ioend_t *ioend)
{
struct buffer_head *bh, *next;
struct xfs_inode *ip = XFS_I(ioend->io_inode);
for (bh = ioend->io_buffer_head; bh; bh = next) {
next = bh->b_private;
@ -127,7 +92,7 @@ xfs_destroy_ioend(
aio_complete(ioend->io_iocb, ioend->io_result, 0);
inode_dio_done(ioend->io_inode);
}
xfs_ioend_wake(ip);
mempool_free(ioend, xfs_ioend_pool);
}
@ -298,7 +263,6 @@ xfs_alloc_ioend(
ioend->io_inode = inode;
ioend->io_buffer_head = NULL;
ioend->io_buffer_tail = NULL;
atomic_inc(&XFS_I(ioend->io_inode)->i_iocount);
ioend->io_offset = 0;
ioend->io_size = 0;
ioend->io_iocb = NULL;
@ -558,7 +522,6 @@ xfs_cancel_ioend(
unlock_buffer(bh);
} while ((bh = next_bh) != NULL);
xfs_ioend_wake(XFS_I(ioend->io_inode));
mempool_free(ioend, xfs_ioend_pool);
} while ((ioend = next) != NULL);
}