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Merge pull request #293 from versity/auke/data_prealloc_min

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scaling prealloc.
This commit is contained in:
Zach Brown
2026-05-28 09:40:31 -07:00
committed by GitHub
parent 634ca720c9 5a6523ecf4
commit 07e90422ee
2 changed files with 15 additions and 7 deletions
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kmod/src/data.c
+9 -1
View File
@@ -422,6 +422,8 @@ static int alloc_block(struct super_block *sb, struct inode *inode,
mutex_lock(&datinf->mutex);
scoutfs_inode_get_onoff(inode, &online, &offline);
/* default to single allocation at the written block */
start = iblock;
count = 1;
@@ -444,7 +446,6 @@ static int alloc_block(struct super_block *sb, struct inode *inode,
* the preallocation size to the number of online
* blocks.
*/
scoutfs_inode_get_onoff(inode, &online, &offline);
if (iblock > 1 && iblock == online) {
ret = scoutfs_ext_next(sb, &data_ext_ops, &args,
iblock, 1, &found);
@@ -486,6 +487,13 @@ static int alloc_block(struct super_block *sb, struct inode *inode,
/* trim count by next extent after iblock */
if (found.len && found.start > start && found.start < start + count)
count = (found.start - start);
/*
* Ramp the aligned region size up proportionally with
* the file's online block count rather than jumping to
* the full prealloc size.
*/
count = max_t(u64, 1, min(count, online));
}
/* overall prealloc limit */
tests/golden/data-prealloc
+6 -6
View File
@@ -8,10 +8,10 @@
/mnt/test/test/data-prealloc/file-1: extents: 32
/mnt/test/test/data-prealloc/file-2: extents: 32
== any writes to region prealloc get full extents
/mnt/test/test/data-prealloc/file-1: extents: 4
/mnt/test/test/data-prealloc/file-2: extents: 4
/mnt/test/test/data-prealloc/file-1: extents: 4
/mnt/test/test/data-prealloc/file-2: extents: 4
/mnt/test/test/data-prealloc/file-1: extents: 8
/mnt/test/test/data-prealloc/file-2: extents: 8
/mnt/test/test/data-prealloc/file-1: extents: 8
/mnt/test/test/data-prealloc/file-2: extents: 8
== streaming offline writes get full extents either way
/mnt/test/test/data-prealloc/file-1: extents: 4
/mnt/test/test/data-prealloc/file-2: extents: 4
@@ -20,8 +20,8 @@
== goofy preallocation amounts work
/mnt/test/test/data-prealloc/file-1: extents: 6
/mnt/test/test/data-prealloc/file-2: extents: 6
/mnt/test/test/data-prealloc/file-1: extents: 6
/mnt/test/test/data-prealloc/file-2: extents: 6
/mnt/test/test/data-prealloc/file-1: extents: 10
/mnt/test/test/data-prealloc/file-2: extents: 10
/mnt/test/test/data-prealloc/file-1: extents: 3
/mnt/test/test/data-prealloc/file-2: extents: 3
== block writes into region allocs hole