Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-09-21 07:23:06 +00:00
Code Issues Packages Projects Releases Wiki Activity

xfs: factor out a xfs_rtalloc_sumlevel helper

Browse Source 
xfs_rtallocate_extent_size has two loops with nearly identical logic
in them.  Split that logic into a separate xfs_rtalloc_sumlevel helper.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>
This commit is contained in:
Christoph Hellwig 2023-12-18 05:57:32 +01:00 committed by Chandan Babu R
parent 3c97c9f78d
commit 8ceee72fdb
1 changed files with 70 additions and 83 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

153
fs/xfs/xfs_rtalloc.c
View File

@ -538,6 +538,52 @@ xfs_rtallocate_extent_near(
return -ENOSPC;
}
static int
xfs_rtalloc_sumlevel(
struct xfs_rtalloc_args *args,
int l, /* level number */
xfs_rtxlen_t minlen, /* minimum length to allocate */
xfs_rtxlen_t maxlen, /* maximum length to allocate */
xfs_rtxlen_t prod, /* extent product factor */
xfs_rtxlen_t *len, /* out: actual length allocated */
xfs_rtxnum_t *rtx) /* out: start rtext allocated */
{
xfs_fileoff_t i; /* bitmap block number */
for (i = 0; i < args->mp->m_sb.sb_rbmblocks; i++) {
xfs_suminfo_t sum; /* summary information for extents */
xfs_rtxnum_t n; /* next rtext to be tried */
int error;
error = xfs_rtget_summary(args, l, i, &sum);
if (error)
return error;
/*
* Nothing there, on to the next block.
*/
if (!sum)
continue;
/*
* Try allocating the extent.
*/
error = xfs_rtallocate_extent_block(args, i, minlen, maxlen,
len, &n, prod, rtx);
if (error != -ENOSPC)
return error;
/*
* If the "next block to try" returned from the allocator is
* beyond the next bitmap block, skip to that bitmap block.
*/
if (xfs_rtx_to_rbmblock(args->mp, n) > i + 1)
i = xfs_rtx_to_rbmblock(args->mp, n) - 1;
}
return -ENOSPC;
}
/*
* Allocate an extent of length minlen<=len<=maxlen, with no position
* specified. If we don't get maxlen then use prod to trim
@ -552,12 +598,8 @@ xfs_rtallocate_extent_size(
xfs_rtxlen_t prod, /* extent product factor */
xfs_rtxnum_t *rtx) /* out: start rtext allocated */
{
struct xfs_mount *mp = args->mp;
int error;
xfs_fileoff_t i; /* bitmap block number */
int l; /* level number (loop control) */
xfs_rtxnum_t n; /* next rtext to be tried */
xfs_suminfo_t sum; /* summary information for extents */
ASSERT(minlen % prod == 0);
ASSERT(maxlen % prod == 0);
@ -565,46 +607,23 @@ xfs_rtallocate_extent_size(
/*
* Loop over all the levels starting with maxlen.
* At each level, look at all the bitmap blocks, to see if there
* are extents starting there that are long enough (>= maxlen).
* Note, only on the initial level can the allocation fail if
* the summary says there's an extent.
*
* At each level, look at all the bitmap blocks, to see if there are
* extents starting there that are long enough (>= maxlen).
*
* Note, only on the initial level can the allocation fail if the
* summary says there's an extent.
*/
for (l = xfs_highbit32(maxlen); l < mp->m_rsumlevels; l++) {
/*
* Loop over all the bitmap blocks.
*/
for (i = 0; i < mp->m_sb.sb_rbmblocks; i++) {
/*
* Get the summary for this level/block.
*/
error = xfs_rtget_summary(args, l, i, &sum);
if (error)
return error;
/*
* Nothing there, on to the next block.
*/
if (!sum)
continue;
/*
* Try allocating the extent.
*/
error = xfs_rtallocate_extent_block(args, i, maxlen,
maxlen, len, &n, prod, rtx);
if (error != -ENOSPC)
return error;
/*
* If the "next block to try" returned from the
* allocator is beyond the next bitmap block,
* skip to that bitmap block.
*/
if (xfs_rtx_to_rbmblock(mp, n) > i + 1)
i = xfs_rtx_to_rbmblock(mp, n) - 1;
}
for (l = xfs_highbit32(maxlen); l < args->mp->m_rsumlevels; l++) {
error = xfs_rtalloc_sumlevel(args, l, minlen, maxlen, prod, len,
rtx);
if (error != -ENOSPC)
return error;
}
/*
* Didn't find any maxlen blocks. Try smaller ones, unless
* we're asking for a fixed size extent.
* Didn't find any maxlen blocks. Try smaller ones, unless we are
* looking for a fixed size extent.
*/
if (minlen > --maxlen)
return -ENOSPC;
@ -613,51 +632,19 @@ xfs_rtallocate_extent_size(
/*
* Loop over sizes, from maxlen down to minlen.
* This time, when we do the allocations, allow smaller ones
* to succeed.
*
* This time, when we do the allocations, allow smaller ones to succeed,
* but make sure the specified minlen/maxlen are in the possible range
* for this summary level.
*/
for (l = xfs_highbit32(maxlen); l >= xfs_highbit32(minlen); l--) {
/*
* Loop over all the bitmap blocks, try an allocation
* starting in that block.
*/
for (i = 0; i < mp->m_sb.sb_rbmblocks; i++) {
/*
* Get the summary information for this level/block.
*/
error = xfs_rtget_summary(args, l, i, &sum);
if (error)
return error;
/*
* If nothing there, go on to next.
*/
if (!sum)
continue;
/*
* Try the allocation. Make sure the specified
* minlen/maxlen are in the possible range for
* this summary level.
*/
error = xfs_rtallocate_extent_block(args, i,
XFS_RTMAX(minlen, 1 << l),
XFS_RTMIN(maxlen, (1 << (l + 1)) - 1),
len, &n, prod, rtx);
if (error != -ENOSPC)
return error;
/*
* If the "next block to try" returned from the
* allocator is beyond the next bitmap block,
* skip to that bitmap block.
*/
if (xfs_rtx_to_rbmblock(mp, n) > i + 1)
i = xfs_rtx_to_rbmblock(mp, n) - 1;
}
error = xfs_rtalloc_sumlevel(args, l, XFS_RTMAX(minlen, 1 << l),
XFS_RTMIN(maxlen, (1 << (l + 1)) - 1), prod,
len, rtx);
if (error != -ENOSPC)
return error;
}
/*
* Got nothing, return failure.
*/
return -ENOSPC;
}