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[XFS] Fix boundary conditions when issuing direct IOs from large userspace

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buffers.

SGI-PV: 944820
SGI-Modid: xfs-linux:xfs-kern:24223a

Signed-off-by: Nathan Scott <nathans@sgi.com>
This commit is contained in:
Nathan Scott 2005-11-02 15:13:13 +11:00
parent 2b3b6d07f7
commit fdc7ed75c0
1 changed files with 16 additions and 12 deletions
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28
fs/xfs/linux-2.6/xfs_aops.c
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@ -935,15 +935,18 @@ __linvfs_get_block(
{
vnode_t *vp = LINVFS_GET_VP(inode);
xfs_iomap_t iomap;
xfs_off_t offset;
ssize_t size;
int retpbbm = 1;
int error;
ssize_t size;
loff_t offset = (loff_t)iblock << inode->i_blkbits;
if (blocks)
size = blocks << inode->i_blkbits;
else
if (blocks) {
offset = blocks << inode->i_blkbits; /* 64 bit goodness */
size = (ssize_t) min_t(xfs_off_t, offset, LONG_MAX);
} else {
size = 1 << inode->i_blkbits;
}
offset = (xfs_off_t)iblock << inode->i_blkbits;
VOP_BMAP(vp, offset, size,
create ? flags : BMAPI_READ, &iomap, &retpbbm, error);
@ -954,8 +957,8 @@ __linvfs_get_block(
return 0;
if (iomap.iomap_bn != IOMAP_DADDR_NULL) {
xfs_daddr_t bn;
loff_t delta;
xfs_daddr_t bn;
xfs_off_t delta;
/* For unwritten extents do not report a disk address on
* the read case (treat as if we're reading into a hole).
@ -987,9 +990,8 @@ __linvfs_get_block(
*/
if (create &&
((!buffer_mapped(bh_result) && !buffer_uptodate(bh_result)) ||
(offset >= i_size_read(inode)) || (iomap.iomap_flags & IOMAP_NEW))) {
(offset >= i_size_read(inode)) || (iomap.iomap_flags & IOMAP_NEW)))
set_buffer_new(bh_result);
}
if (iomap.iomap_flags & IOMAP_DELAY) {
BUG_ON(direct);
@ -1001,9 +1003,11 @@ __linvfs_get_block(
}
if (blocks) {
bh_result->b_size = (ssize_t)min(
(loff_t)(iomap.iomap_bsize - iomap.iomap_delta),
(loff_t)(blocks << inode->i_blkbits));
ASSERT(iomap.iomap_bsize - iomap.iomap_delta > 0);
offset = min_t(xfs_off_t,
iomap.iomap_bsize - iomap.iomap_delta,
blocks << inode->i_blkbits);
bh_result->b_size = (u32) min_t(xfs_off_t, UINT_MAX, offset);
}
return 0;