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xfs: remove i_iocount 

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);
}

3
fs/xfs/xfs_aops.h
View File

@ -61,9 +61,6 @@ typedef struct xfs_ioend {
extern const struct address_space_operations xfs_address_space_operations;
extern int xfs_get_blocks(struct inode *, sector_t, struct buffer_head *, int);
extern void xfs_ioend_init(void);
extern void xfs_ioend_wait(struct xfs_inode *);
extern void xfs_count_page_state(struct page *, int *, int *);
#endif /* __XFS_AOPS_H__ */

8
fs/xfs/xfs_file.c
View File

@ -149,10 +149,6 @@ xfs_file_fsync(
xfs_iflags_clear(ip, XFS_ITRUNCATED);
xfs_ilock(ip, XFS_IOLOCK_SHARED);
xfs_ioend_wait(ip);
xfs_iunlock(ip, XFS_IOLOCK_SHARED);
if (mp->m_flags & XFS_MOUNT_BARRIER) {
/*
* If we have an RT and/or log subvolume we need to make sure
@ -758,7 +754,7 @@ restart:
* the dio layer. To avoid the problem with aio, we also need to wait for
* outstanding IOs to complete so that unwritten extent conversion is completed
* before we try to map the overlapping block. This is currently implemented by
* hitting it with a big hammer (i.e. xfs_ioend_wait()).
* hitting it with a big hammer (i.e. inode_dio_wait()).
*
* Returns with locks held indicated by @iolock and errors indicated by
* negative return values.
@ -821,7 +817,7 @@ xfs_file_dio_aio_write(
* otherwise demote the lock if we had to flush cached pages
*/
if (unaligned_io)
xfs_ioend_wait(ip);
inode_dio_wait(inode);
else if (*iolock == XFS_IOLOCK_EXCL) {
xfs_rw_ilock_demote(ip, XFS_IOLOCK_EXCL);
*iolock = XFS_IOLOCK_SHARED;

2
fs/xfs/xfs_iget.c
View File

@ -75,7 +75,6 @@ xfs_inode_alloc(
return NULL;
}
ASSERT(atomic_read(&ip->i_iocount) == 0);
ASSERT(atomic_read(&ip->i_pincount) == 0);
ASSERT(!spin_is_locked(&ip->i_flags_lock));
ASSERT(completion_done(&ip->i_flush));
@ -150,7 +149,6 @@ xfs_inode_free(
}
/* asserts to verify all state is correct here */
ASSERT(atomic_read(&ip->i_iocount) == 0);
ASSERT(atomic_read(&ip->i_pincount) == 0);
ASSERT(!spin_is_locked(&ip->i_flags_lock));
ASSERT(completion_done(&ip->i_flush));

1
fs/xfs/xfs_inode.h
View File

@ -257,7 +257,6 @@ typedef struct xfs_inode {
xfs_fsize_t i_size; /* in-memory size */
xfs_fsize_t i_new_size; /* size when write completes */
atomic_t i_iocount; /* outstanding I/O count */
/* VFS inode */
struct inode i_vnode; /* embedded VFS inode */

4
fs/xfs/xfs_iops.c
View File

@ -840,9 +840,9 @@ xfs_setattr_size(
}
/*
* Wait for all I/O to complete.
* Wait for all direct I/O to complete.
*/
xfs_ioend_wait(ip);
inode_dio_wait(inode);
error = -block_truncate_page(inode->i_mapping, iattr->ia_size,
xfs_get_blocks);

7
fs/xfs/xfs_super.c
View File

@ -796,8 +796,6 @@ xfs_fs_destroy_inode(
if (is_bad_inode(inode))
goto out_reclaim;
xfs_ioend_wait(ip);
ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);
/*
@ -837,7 +835,6 @@ xfs_fs_inode_init_once(
inode_init_once(VFS_I(ip));
/* xfs inode */
atomic_set(&ip->i_iocount, 0);
atomic_set(&ip->i_pincount, 0);
spin_lock_init(&ip->i_flags_lock);
init_waitqueue_head(&ip->i_ipin_wait);
@ -914,9 +911,8 @@ xfs_fs_write_inode(
* of forcing it all the way to stable storage using a
* synchronous transaction we let the log force inside the
* ->sync_fs call do that for thus, which reduces the number
* of synchronous log foces dramatically.
* of synchronous log forces dramatically.
*/
xfs_ioend_wait(ip);
error = xfs_log_inode(ip);
if (error)
goto out;
@ -1681,7 +1677,6 @@ init_xfs_fs(void)
printk(KERN_INFO XFS_VERSION_STRING " with "
XFS_BUILD_OPTIONS " enabled\n");
xfs_ioend_init();
xfs_dir_startup();
error = xfs_init_zones();

8
fs/xfs/xfs_sync.c
View File

@ -227,21 +227,17 @@ xfs_sync_inode_data(
int error = 0;
if (!mapping_tagged(mapping, PAGECACHE_TAG_DIRTY))
goto out_wait;
return 0;
if (!xfs_ilock_nowait(ip, XFS_IOLOCK_SHARED)) {
if (flags & SYNC_TRYLOCK)
goto out_wait;
return 0;
xfs_ilock(ip, XFS_IOLOCK_SHARED);
}
error = xfs_flush_pages(ip, 0, -1, (flags & SYNC_WAIT) ?
0 : XBF_ASYNC, FI_NONE);
xfs_iunlock(ip, XFS_IOLOCK_SHARED);
out_wait:
if (flags & SYNC_WAIT)
xfs_ioend_wait(ip);
return error;
}

4
fs/xfs/xfs_vnodeops.c
View File

@ -647,8 +647,6 @@ xfs_inactive(
if (truncate) {
xfs_ilock(ip, XFS_IOLOCK_EXCL);
xfs_ioend_wait(ip);
error = xfs_trans_reserve(tp, 0,
XFS_ITRUNCATE_LOG_RES(mp),
0, XFS_TRANS_PERM_LOG_RES,
@ -2076,7 +2074,7 @@ xfs_free_file_space(
if (need_iolock) {
xfs_ilock(ip, XFS_IOLOCK_EXCL);
/* wait for the completion of any pending DIOs */
xfs_ioend_wait(ip);
inode_dio_wait(VFS_I(ip));
}
rounding = max_t(uint, 1 << mp->m_sb.sb_blocklog, PAGE_CACHE_SIZE);