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authorDave Chinner <dchinner@redhat.com>2012-04-23 15:58:51 +1000
committerBen Myers <bpm@sgi.com>2012-05-14 16:20:47 -0500
commit4e94b71b7068b4bd9c615301197e09dbf0c3b770 (patch)
treefc441ec17202a749a6b1a3d5b70ba37101b595da /fs/xfs/xfs_buf.c
parentde1cbee46269a3b707eb99b37f33afdd4cfaaea4 (diff)
xfs: use blocks for counting length of buffers
Now that we pass block counts everywhere, and index buffers by block number, track the length of the buffer in units of blocks rather than bytes. Convert the code to use block counts, and those that need byte counts get converted at the time of use. Also, remove the XFS_BUF_{SET_}SIZE() macros that are just wrappers around the buffer length. They only serve to make the code shouty loud and don't actually add any real value. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Mark Tinguely <tinguely@sgi.com> Signed-off-by: Ben Myers <bpm@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_buf.c')
-rw-r--r--fs/xfs/xfs_buf.c22
1 files changed, 12 insertions, 10 deletions
diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index 854b27a8e77..382c49a42ac 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -198,11 +198,12 @@ xfs_buf_alloc(
bp->b_target = target;
/*
- * Set buffer_length and count_desired to the same value initially.
+ * Set length and count_desired to the same value initially.
* I/O routines should use count_desired, which will be the same in
* most cases but may be reset (e.g. XFS recovery).
*/
- bp->b_buffer_length = bp->b_count_desired = numblks << BBSHIFT;
+ bp->b_length = numblks;
+ bp->b_count_desired = numblks << BBSHIFT;
bp->b_flags = flags;
/*
@@ -313,14 +314,14 @@ xfs_buf_allocate_memory(
* the memory from the heap - there's no need for the complexity of
* page arrays to keep allocation down to order 0.
*/
- if (bp->b_buffer_length < PAGE_SIZE) {
- bp->b_addr = kmem_alloc(bp->b_buffer_length, xb_to_km(flags));
+ if (bp->b_length < BTOBB(PAGE_SIZE)) {
+ bp->b_addr = kmem_alloc(BBTOB(bp->b_length), xb_to_km(flags));
if (!bp->b_addr) {
/* low memory - use alloc_page loop instead */
goto use_alloc_page;
}
- if (((unsigned long)(bp->b_addr + bp->b_buffer_length - 1) &
+ if (((unsigned long)(bp->b_addr + BBTOB(bp->b_length) - 1) &
PAGE_MASK) !=
((unsigned long)bp->b_addr & PAGE_MASK)) {
/* b_addr spans two pages - use alloc_page instead */
@@ -337,7 +338,7 @@ xfs_buf_allocate_memory(
}
use_alloc_page:
- end = BBTOB(bp->b_bn) + bp->b_buffer_length;
+ end = BBTOB(bp->b_bn + bp->b_length);
page_count = xfs_buf_btoc(end) - xfs_buf_btoct(BBTOB(bp->b_bn));
error = _xfs_buf_get_pages(bp, page_count, flags);
if (unlikely(error))
@@ -477,7 +478,7 @@ _xfs_buf_find(
* reallocating a busy extent. Skip this buffer and
* continue searching to the right for an exact match.
*/
- if (bp->b_buffer_length != numbytes) {
+ if (bp->b_length != numblks) {
ASSERT(bp->b_flags & XBF_STALE);
rbp = &(*rbp)->rb_right;
continue;
@@ -574,7 +575,7 @@ xfs_buf_get(
* that we can do IO on it.
*/
bp->b_bn = blkno;
- bp->b_count_desired = bp->b_buffer_length;
+ bp->b_count_desired = BBTOB(bp->b_length);
found:
if (!(bp->b_flags & XBF_MAPPED)) {
@@ -716,7 +717,8 @@ xfs_buf_set_empty(
bp->b_pages = NULL;
bp->b_page_count = 0;
bp->b_addr = NULL;
- bp->b_buffer_length = bp->b_count_desired = numblks << BBSHIFT;
+ bp->b_length = numblks;
+ bp->b_count_desired = numblks << BBSHIFT;
bp->b_bn = XFS_BUF_DADDR_NULL;
bp->b_flags &= ~XBF_MAPPED;
}
@@ -769,7 +771,7 @@ xfs_buf_associate_memory(
}
bp->b_count_desired = len;
- bp->b_buffer_length = buflen;
+ bp->b_length = BTOBB(buflen);
bp->b_flags |= XBF_MAPPED;
return 0;