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[XFS] Delay I/O completion for unwritten extents after conversion

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SGI-PV: 936584
SGI-Modid: xfs-linux:xfs-kern:196886a

Signed-off-by: Christoph Hellwig <hch@sgi.com>
Signed-off-by: Nathan Scott <nathans@sgi.com>
This commit is contained in:
Christoph Hellwig 2005-09-05 08:23:35 +10:00 committed by Nathan Scott
parent f09738638d
commit c1a073bdff
2 changed files with 26 additions and 2 deletions
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27
fs/xfs/linux-2.6/xfs_aops.c
View file

@ -136,10 +136,21 @@ xfs_end_bio_unwritten(
vnode_t *vp = ioend->io_vnode;
xfs_off_t offset = ioend->io_offset;
size_t size = ioend->io_size;
struct buffer_head *bh, *next;
int error;
if (ioend->io_uptodate)
VOP_BMAP(vp, offset, size, BMAPI_UNWRITTEN, NULL, NULL, error);
/* ioend->io_buffer_head is only non-NULL for buffered I/O */
for (bh = ioend->io_buffer_head; bh; bh = next) {
next = bh->b_private;
bh->b_end_io = NULL;
clear_buffer_unwritten(bh);
end_buffer_async_write(bh, ioend->io_uptodate);
}
xfs_destroy_ioend(ioend);
}
@ -165,6 +176,7 @@ xfs_alloc_ioend(
atomic_set(&ioend->io_remaining, 1);
ioend->io_uptodate = 1; /* cleared if any I/O fails */
ioend->io_vnode = LINVFS_GET_VP(inode);
ioend->io_buffer_head = NULL;
atomic_inc(&ioend->io_vnode->v_iocount);
ioend->io_offset = 0;
ioend->io_size = 0;
@ -180,15 +192,26 @@ linvfs_unwritten_done(
int uptodate)
{
xfs_ioend_t *ioend = bh->b_private;
static spinlock_t unwritten_done_lock = SPIN_LOCK_UNLOCKED;
unsigned long flags;
ASSERT(buffer_unwritten(bh));
bh->b_end_io = NULL;
clear_buffer_unwritten(bh);
if (!uptodate)
ioend->io_uptodate = 0;
/*
* Deep magic here. We reuse b_private in the buffer_heads to build
* a chain for completing the I/O from user context after we've issued
* a transaction to convert the unwritten extent.
*/
spin_lock_irqsave(&unwritten_done_lock, flags);
bh->b_private = ioend->io_buffer_head;
ioend->io_buffer_head = bh;
spin_unlock_irqrestore(&unwritten_done_lock, flags);
xfs_finish_ioend(ioend);
end_buffer_async_write(bh, uptodate);
}
STATIC int

1
fs/xfs/linux-2.6/xfs_aops.h
View file

@ -41,6 +41,7 @@ typedef struct xfs_ioend {
unsigned int io_uptodate; /* I/O status register */
atomic_t io_remaining; /* hold count */
struct vnode *io_vnode; /* file being written to */
struct buffer_head *io_buffer_head;/* buffer linked list head */
size_t io_size; /* size of the extent */
xfs_off_t io_offset; /* offset in the file */
struct work_struct io_work; /* xfsdatad work queue */