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xfs: report iomap_bn in block base 

Report the iomap_bn field of struct xfs_iomap in terms of filesystem
blocks instead of in terms of bytes.  Shift the byte conversions
into the caller, and replace the IOMAP_DELAY and IOMAP_HOLE flag
checks with checks for HOLESTARTBLOCK and DELAYSTARTBLOCK.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Christoph Hellwig 2010-04-28 12:28:55 +00:00 committed by Alex Elder
parent 8699bb0a48
commit e513182d4d
3 changed files with 16 additions and 26 deletions
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19
fs/xfs/linux-2.6/xfs_aops.c
View File

@ -568,10 +568,12 @@ xfs_map_buffer(
sector_t bn;
struct xfs_mount *m = XFS_I(inode)->i_mount;
xfs_off_t iomap_offset = XFS_FSB_TO_B(m, mp->iomap_offset);
xfs_daddr_t iomap_bn = xfs_fsb_to_db(XFS_I(inode), mp->iomap_bn);
ASSERT(mp->iomap_bn != IOMAP_DADDR_NULL);
ASSERT(mp->iomap_bn != HOLESTARTBLOCK);
ASSERT(mp->iomap_bn != DELAYSTARTBLOCK);
bn = (mp->iomap_bn >> (inode->i_blkbits - BBSHIFT)) +
bn = (iomap_bn >> (inode->i_blkbits - BBSHIFT)) +
((offset - iomap_offset) >> inode->i_blkbits);
ASSERT(bn || XFS_IS_REALTIME_INODE(XFS_I(inode)));
@ -587,8 +589,8 @@ xfs_map_at_offset(
xfs_iomap_t *iomapp,
xfs_off_t offset)
{
ASSERT(!(iomapp->iomap_flags & IOMAP_HOLE));
ASSERT(!(iomapp->iomap_flags & IOMAP_DELAY));
ASSERT(iomapp->iomap_bn != HOLESTARTBLOCK);
ASSERT(iomapp->iomap_bn != DELAYSTARTBLOCK);
lock_buffer(bh);
xfs_map_buffer(inode, bh, iomapp, offset);
@ -818,8 +820,8 @@ xfs_convert_page(
continue;
}
ASSERT(!(mp->iomap_flags & IOMAP_HOLE));
ASSERT(!(mp->iomap_flags & IOMAP_DELAY));
ASSERT(mp->iomap_bn != HOLESTARTBLOCK);
ASSERT(mp->iomap_bn != DELAYSTARTBLOCK);
xfs_map_at_offset(inode, bh, mp, offset);
if (startio) {
@ -1478,7 +1480,8 @@ __xfs_get_blocks(
if (niomap == 0)
return 0;
if (iomap.iomap_bn != IOMAP_DADDR_NULL) {
if (iomap.iomap_bn != HOLESTARTBLOCK &&
iomap.iomap_bn != DELAYSTARTBLOCK) {
/*
* For unwritten extents do not report a disk address on
* the read case (treat as if we're reading into a hole).
@ -1513,7 +1516,7 @@ __xfs_get_blocks(
(iomap.iomap_flags & (IOMAP_NEW|IOMAP_UNWRITTEN))))
set_buffer_new(bh_result);
if (iomap.iomap_flags & IOMAP_DELAY) {
if (iomap.iomap_bn == DELAYSTARTBLOCK) {
BUG_ON(direct);
if (create) {
set_buffer_uptodate(bh_result);

17
fs/xfs/xfs_iomap.c
View File

@ -64,24 +64,15 @@ xfs_imap_to_bmap(
int imaps, /* Number of imap entries */
int flags)
{
xfs_fsblock_t start_block;
iomapp->iomap_offset = imap->br_startoff;
iomapp->iomap_bsize = imap->br_blockcount;
iomapp->iomap_flags = flags;
iomapp->iomap_bn = imap->br_startblock;
start_block = imap->br_startblock;
if (start_block == HOLESTARTBLOCK) {
iomapp->iomap_bn = IOMAP_DADDR_NULL;
iomapp->iomap_flags |= IOMAP_HOLE;
} else if (start_block == DELAYSTARTBLOCK) {
iomapp->iomap_bn = IOMAP_DADDR_NULL;
iomapp->iomap_flags |= IOMAP_DELAY;
} else {
iomapp->iomap_bn = xfs_fsb_to_db(ip, start_block);
if (ISUNWRITTEN(imap))
if (imap->br_startblock != HOLESTARTBLOCK &&
imap->br_startblock != DELAYSTARTBLOCK &&
ISUNWRITTEN(imap))
iomapp->iomap_flags |= IOMAP_UNWRITTEN;
}
}
int

4
fs/xfs/xfs_iomap.h
View File

@ -18,12 +18,8 @@
#ifndef __XFS_IOMAP_H__
#define __XFS_IOMAP_H__
#define IOMAP_DADDR_NULL ((xfs_daddr_t) (-1LL))
typedef enum { /* iomap_flags values */
IOMAP_READ = 0, /* mapping for a read */
IOMAP_HOLE = 0x02, /* mapping covers a hole */
IOMAP_DELAY = 0x04, /* mapping covers delalloc region */
IOMAP_UNWRITTEN = 0x20, /* mapping covers allocated */
/* but uninitialized file data */