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xfs: fix xfs to work with Virtually Indexed architectures 

xfs_buf.c includes what is essentially a hand rolled version of
blk_rq_map_kern().  In order to work properly with the vmalloc buffers
that xfs uses, this hand rolled routine must also implement the flushing
API for vmap/vmalloc areas.

[style updates from hch@lst.de]
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
James Bottomley 2010-01-25 11:42:24 -06:00 committed by James Bottomley
parent c9334f6067
commit 73c77e2ccc
1 changed files with 29 additions and 1 deletions
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30
fs/xfs/linux-2.6/xfs_buf.c
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@ -76,6 +76,27 @@ struct workqueue_struct *xfsconvertd_workqueue;
#define xfs_buf_deallocate(bp) \
kmem_zone_free(xfs_buf_zone, (bp));
static inline int
xfs_buf_is_vmapped(
struct xfs_buf *bp)
{
/*
* Return true if the buffer is vmapped.
*
* The XBF_MAPPED flag is set if the buffer should be mapped, but the
* code is clever enough to know it doesn't have to map a single page,
* so the check has to be both for XBF_MAPPED and bp->b_page_count > 1.
*/
return (bp->b_flags & XBF_MAPPED) && bp->b_page_count > 1;
}
static inline int
xfs_buf_vmap_len(
struct xfs_buf *bp)
{
return (bp->b_page_count * PAGE_SIZE) - bp->b_offset;
}
/*
* Page Region interfaces.
*
@ -314,7 +335,7 @@ xfs_buf_free(
if (bp->b_flags & (_XBF_PAGE_CACHE|_XBF_PAGES)) {
uint i;
if ((bp->b_flags & XBF_MAPPED) && (bp->b_page_count > 1))
if (xfs_buf_is_vmapped(bp))
free_address(bp->b_addr - bp->b_offset);
for (i = 0; i < bp->b_page_count; i++) {
@ -1107,6 +1128,9 @@ xfs_buf_bio_end_io(
xfs_buf_ioerror(bp, -error);
if (!error && xfs_buf_is_vmapped(bp) && (bp->b_flags & XBF_READ))
invalidate_kernel_vmap_range(bp->b_addr, xfs_buf_vmap_len(bp));
do {
struct page *page = bvec->bv_page;
@ -1216,6 +1240,10 @@ next_chunk:
submit_io:
if (likely(bio->bi_size)) {
if (xfs_buf_is_vmapped(bp)) {
flush_kernel_vmap_range(bp->b_addr,
xfs_buf_vmap_len(bp));
}
submit_bio(rw, bio);
if (size)
goto next_chunk;