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xfs: pass post-eof speculative prealloc blocks to bmapi 

xfs_file_iomap_begin_delay() implements post-eof speculative
preallocation by extending the block count of the requested delayed
allocation. Now that xfs_bmapi_reserve_delalloc() has been updated to
handle prealloc blocks separately and tag the inode, update
xfs_file_iomap_begin_delay() to use the new parameter and rely on the
former to tag the inode.

Note that this patch does not change behavior.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Brian Foster 2016-11-28 14:57:42 +11:00 committed by Dave Chinner
parent 0260d8ff5f
commit f782088c9e
1 changed files with 13 additions and 20 deletions
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33
fs/xfs/xfs_iomap.c
View File

@ -536,10 +536,11 @@ xfs_file_iomap_begin_delay(
xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
xfs_fileoff_t maxbytes_fsb =
XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
xfs_fileoff_t end_fsb, orig_end_fsb;
xfs_fileoff_t end_fsb;
int error = 0, eof = 0;
struct xfs_bmbt_irec got;
xfs_extnum_t idx;
xfs_fsblock_t prealloc_blocks = 0;
ASSERT(!XFS_IS_REALTIME_INODE(ip));
ASSERT(!xfs_get_extsz_hint(ip));
@ -594,33 +595,32 @@ xfs_file_iomap_begin_delay(
* the lower level functions are updated.
*/
count = min_t(loff_t, count, 1024 * PAGE_SIZE);
end_fsb = orig_end_fsb =
min(XFS_B_TO_FSB(mp, offset + count), maxbytes_fsb);
end_fsb = min(XFS_B_TO_FSB(mp, offset + count), maxbytes_fsb);
if (eof) {
xfs_fsblock_t prealloc_blocks;
prealloc_blocks = xfs_iomap_prealloc_size(ip, offset, count, idx);
if (prealloc_blocks) {
xfs_extlen_t align;
xfs_off_t end_offset;
xfs_fileoff_t p_end_fsb;
end_offset = XFS_WRITEIO_ALIGN(mp, offset + count - 1);
end_fsb = XFS_B_TO_FSBT(mp, end_offset) +
prealloc_blocks;
p_end_fsb = XFS_B_TO_FSBT(mp, end_offset) +
prealloc_blocks;
align = xfs_eof_alignment(ip, 0);
if (align)
end_fsb = roundup_64(end_fsb, align);
p_end_fsb = roundup_64(p_end_fsb, align);
end_fsb = min(end_fsb, maxbytes_fsb);
ASSERT(end_fsb > offset_fsb);
p_end_fsb = min(p_end_fsb, maxbytes_fsb);
ASSERT(p_end_fsb > offset_fsb);
prealloc_blocks = p_end_fsb - end_fsb;
}
}
retry:
error = xfs_bmapi_reserve_delalloc(ip, XFS_DATA_FORK, offset_fsb,
end_fsb - offset_fsb, 0, &got, &idx, eof);
end_fsb - offset_fsb, prealloc_blocks, &got, &idx, eof);
switch (error) {
case 0:
break;
@ -628,8 +628,8 @@ retry:
case -EDQUOT:
/* retry without any preallocation */
trace_xfs_delalloc_enospc(ip, offset, count);
if (end_fsb != orig_end_fsb) {
end_fsb = orig_end_fsb;
if (prealloc_blocks) {
prealloc_blocks = 0;
goto retry;
}
/*FALLTHRU*/
@ -637,13 +637,6 @@ retry:
goto out_unlock;
}
/*
* Tag the inode as speculatively preallocated so we can reclaim this
* space on demand, if necessary.
*/
if (end_fsb != orig_end_fsb)
xfs_inode_set_eofblocks_tag(ip);
trace_xfs_iomap_alloc(ip, offset, count, 0, &got);
done:
if (isnullstartblock(got.br_startblock))