The default has been 1, that is, the first encountered free extent with any length
from 1 to requested is allocated and returned.
So, allow changing minimal extent length to allocate.
Signed-off-by: Ivan Shapovalov <intelfx100@xxxxxxxxx>
---
fs/reiser4/block_alloc.h | 2 ++
fs/reiser4/plugin/space/bitmap.c | 20 +++++++++++++++-----
2 files changed, 17 insertions(+), 5 deletions(-)
diff --git a/fs/reiser4/block_alloc.h b/fs/reiser4/block_alloc.h
index 903bc8f..ac1a747 100644
--- a/fs/reiser4/block_alloc.h
+++ b/fs/reiser4/block_alloc.h
@@ -45,6 +45,8 @@ struct reiser4_blocknr_hint {
reiser4_block_nr blk;
/* if not zero, it is a region size we search for free blocks in */
reiser4_block_nr max_dist;
+ /* if not zero, minimal length of an extent to allocate */
+ reiser4_block_nr min_len;
/* level for allocation, may be useful have branch-level and higher
write-optimized. */
tree_level level;
diff --git a/fs/reiser4/plugin/space/bitmap.c b/fs/reiser4/plugin/space/bitmap.c
index 0ce07da..7c0a1e4 100644
--- a/fs/reiser4/plugin/space/bitmap.c
+++ b/fs/reiser4/plugin/space/bitmap.c
@@ -1101,7 +1101,7 @@ static int alloc_blocks_forward(reiser4_blocknr_hint *hint, int needed,
reiser4_block_nr *start, reiser4_block_nr *len)
{
struct super_block *super = get_current_context()->super;
- int actual_len;
+ int min_len, actual_len;
reiser4_block_nr search_start;
reiser4_block_nr search_end;
@@ -1117,12 +1117,17 @@ static int alloc_blocks_forward(reiser4_blocknr_hint *hint, int needed,
LIMIT(hint->blk + hint->max_dist,
reiser4_block_count(super));
+ if (hint->min_len == 0)
+ min_len = 1;
+ else
+ min_len = (int)hint->min_len;
+
/* We use @hint -> blk as a search start and search from it to the end
of the disk or in given region if @hint -> max_dist is not zero */
search_start = hint->blk;
actual_len =
- bitmap_alloc_forward(&search_start, &search_end, 1, needed);
+ bitmap_alloc_forward(&search_start, &search_end, min_len, needed);
/* There is only one bitmap search if max_dist was specified, first
pass was from the beginning of the bitmap, or if the monotonic flag
@@ -1134,7 +1139,7 @@ static int alloc_blocks_forward(reiser4_blocknr_hint *hint, int needed,
search_end = search_start;
search_start = 0;
actual_len =
- bitmap_alloc_forward(&search_start, &search_end, 1, needed);
+ bitmap_alloc_forward(&search_start, &search_end, min_len, needed);
}
if (actual_len == 0)
return RETERR(-ENOSPC);
@@ -1151,7 +1156,7 @@ static int alloc_blocks_backward(reiser4_blocknr_hint * hint, int needed,
{
reiser4_block_nr search_start;
reiser4_block_nr search_end;
- int actual_len;
+ int min_len, actual_len;
ON_DEBUG(struct super_block *super = reiser4_get_current_sb());
@@ -1165,8 +1170,13 @@ static int alloc_blocks_backward(reiser4_blocknr_hint * hint, int needed,
else
search_end = search_start - hint->max_dist;
+ if (hint->min_len == 0)
+ min_len = 1;
+ else
+ min_len = (int)hint->min_len;
+
actual_len =
- bitmap_alloc_backward(&search_start, &search_end, 1, needed);
+ bitmap_alloc_backward(&search_start, &search_end, min_len, needed);
if (actual_len == 0)
return RETERR(-ENOSPC);
if (actual_len < 0)
--
2.1.3
--
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