From 4a06fd262dbeb70a2c315f7259e063efa493fe3d Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 23 Aug 2011 08:28:13 +0000 Subject: [PATCH] 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 Reviewed-by: Dave Chinner Signed-off-by: Alex Elder --- fs/xfs/xfs_aops.c | 39 +-------------------------------------- fs/xfs/xfs_aops.h | 3 --- fs/xfs/xfs_file.c | 8 ++------ fs/xfs/xfs_iget.c | 2 -- fs/xfs/xfs_inode.h | 1 - fs/xfs/xfs_iops.c | 4 ++-- fs/xfs/xfs_super.c | 7 +------ fs/xfs/xfs_sync.c | 8 ++------ fs/xfs/xfs_vnodeops.c | 4 +--- 9 files changed, 9 insertions(+), 67 deletions(-) diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c index e1ff0770784e..46bba3e0af47 100644 --- a/fs/xfs/xfs_aops.c +++ b/fs/xfs/xfs_aops.c @@ -38,40 +38,6 @@ #include #include - -/* - * 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); } diff --git a/fs/xfs/xfs_aops.h b/fs/xfs/xfs_aops.h index ce3dcb50762e..116dd5c37034 100644 --- a/fs/xfs/xfs_aops.h +++ b/fs/xfs/xfs_aops.h @@ -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__ */ diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index cbbac5cc9c26..ee63c4fb3639 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -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; diff --git a/fs/xfs/xfs_iget.c b/fs/xfs/xfs_iget.c index 7759812c1bbe..0fa98b1c70ea 100644 --- a/fs/xfs/xfs_iget.c +++ b/fs/xfs/xfs_iget.c @@ -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)); diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h index 2380a4bcbece..760140d1dd66 100644 --- a/fs/xfs/xfs_inode.h +++ b/fs/xfs/xfs_inode.h @@ -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 */ diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c index 32aca87bde5e..e041e917c1d9 100644 --- a/fs/xfs/xfs_iops.c +++ b/fs/xfs/xfs_iops.c @@ -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); diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c index 2366c54cc4fa..54d5e102ffe1 100644 --- a/fs/xfs/xfs_super.c +++ b/fs/xfs/xfs_super.c @@ -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(); diff --git a/fs/xfs/xfs_sync.c b/fs/xfs/xfs_sync.c index 90cc197e0433..bf2b38c21caa 100644 --- a/fs/xfs/xfs_sync.c +++ b/fs/xfs/xfs_sync.c @@ -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; } diff --git a/fs/xfs/xfs_vnodeops.c b/fs/xfs/xfs_vnodeops.c index 51fc429527bc..c2ff0fc86567 100644 --- a/fs/xfs/xfs_vnodeops.c +++ b/fs/xfs/xfs_vnodeops.c @@ -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);