Commit 686865f7 authored by Dave Chinner's avatar Dave Chinner Committed by Alex Elder
Browse files

xfs: rename xfs_buf_get_nodaddr to be more appropriate 



xfs_buf_get_nodaddr() is really used to allocate a buffer that is
uncached. While it is not directly assigned a disk address, the fact
that they are not cached is a more important distinction. With the
upcoming uncached buffer read primitive, we should be consistent
with this disctinction.

While there, make page allocation in xfs_buf_get_nodaddr() safe
against memory reclaim re-entrancy into the filesystem by allowing
a flags parameter to be passed.

Signed-off-by: default avatarDave Chinner <dchinner@redhat.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarAlex Elder <aelder@sgi.com>
parent dcd79a14

fs/xfs/linux-2.6/xfs_buf.c

+5 −4
Original line number Diff line number Diff line
@@ -707,9 +707,10 @@ xfs_buf_associate_memory( 
}



xfs_buf_t *

xfs_buf_get_noaddr(

xfs_buf_get_uncached(

	struct xfs_buftarg	*target,

	size_t			len,

	xfs_buftarg_t		*target)

	int			flags)

{

	unsigned long		page_count = PAGE_ALIGN(len) >> PAGE_SHIFT;

	int			error, i;
@@ -725,7 +726,7 @@ xfs_buf_get_noaddr( 
		goto fail_free_buf;



	for (i = 0; i < page_count; i++) {

		bp->b_pages[i] = alloc_page(GFP_KERNEL);

		bp->b_pages[i] = alloc_page(xb_to_gfp(flags));

		if (!bp->b_pages[i])

			goto fail_free_mem;

	}
@@ -740,7 +741,7 @@ xfs_buf_get_noaddr( 


	xfs_buf_unlock(bp);



	trace_xfs_buf_get_noaddr(bp, _RET_IP_);

	trace_xfs_buf_get_uncached(bp, _RET_IP_);

	return bp;



 fail_free_mem:

fs/xfs/linux-2.6/xfs_buf.h

+1 −1
Original line number Diff line number Diff line
@@ -213,7 +213,7 @@ extern xfs_buf_t *xfs_buf_read(xfs_buftarg_t *, xfs_off_t, size_t, 
				xfs_buf_flags_t);



extern xfs_buf_t *xfs_buf_get_empty(size_t, xfs_buftarg_t *);

extern xfs_buf_t *xfs_buf_get_noaddr(size_t, xfs_buftarg_t *);

extern xfs_buf_t *xfs_buf_get_uncached(struct xfs_buftarg *, size_t, int);

extern int xfs_buf_associate_memory(xfs_buf_t *, void *, size_t);

extern void xfs_buf_hold(xfs_buf_t *);

extern void xfs_buf_readahead(xfs_buftarg_t *, xfs_off_t, size_t,

fs/xfs/linux-2.6/xfs_trace.h

+1 −1
Original line number Diff line number Diff line
@@ -331,7 +331,7 @@ DEFINE_BUF_EVENT(xfs_buf_iowait_done); 
DEFINE_BUF_EVENT(xfs_buf_delwri_queue);

DEFINE_BUF_EVENT(xfs_buf_delwri_dequeue);

DEFINE_BUF_EVENT(xfs_buf_delwri_split);

DEFINE_BUF_EVENT(xfs_buf_get_noaddr);

DEFINE_BUF_EVENT(xfs_buf_get_uncached);

DEFINE_BUF_EVENT(xfs_bdstrat_shut);

DEFINE_BUF_EVENT(xfs_buf_item_relse);

DEFINE_BUF_EVENT(xfs_buf_item_iodone);

fs/xfs/xfs_log.c

+2 −1
Original line number Diff line number Diff line
@@ -1131,7 +1131,8 @@ xlog_alloc_log(xfs_mount_t *mp, 
		iclog->ic_prev = prev_iclog;

		prev_iclog = iclog;



		bp = xfs_buf_get_noaddr(log->l_iclog_size, mp->m_logdev_targp);

		bp = xfs_buf_get_uncached(mp->m_logdev_targp,

						log->l_iclog_size, 0);

		if (!bp)

			goto out_free_iclog;

		if (!XFS_BUF_CPSEMA(bp))

fs/xfs/xfs_log_recover.c

+2 −1
Original line number Diff line number Diff line
@@ -107,7 +107,8 @@ xlog_get_bp( 
		nbblks += log->l_sectBBsize;

	nbblks = round_up(nbblks, log->l_sectBBsize);



	return xfs_buf_get_noaddr(BBTOB(nbblks), log->l_mp->m_logdev_targp);

	return xfs_buf_get_uncached(log->l_mp->m_logdev_targp,

					BBTOB(nbblks), 0);

}



STATIC void

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