From: Chris Mason <mason@suse.com>
Enable preallocation for reiserfs_file_write when the write size is smaller
than the default preallocation size.
---
25-akpm/fs/reiserfs/file.c | 8 +++++++-
25-akpm/fs/reiserfs/super.c | 4 ++--
2 files changed, 9 insertions(+), 3 deletions(-)
diff -puN fs/reiserfs/file.c~reiserfs-prealloc fs/reiserfs/file.c
--- 25/fs/reiserfs/file.c~reiserfs-prealloc Wed Mar 24 15:14:44 2004
+++ 25-akpm/fs/reiserfs/file.c Wed Mar 24 15:14:44 2004
@@ -215,7 +215,13 @@ int reiserfs_allocate_blocks_for_region(
hint.key = key.on_disk_key; // on disk key of file.
hint.block = inode->i_blocks>>(inode->i_sb->s_blocksize_bits-9); // Number of disk blocks this file occupies already.
hint.formatted_node = 0; // We are allocating blocks for unformatted node.
- hint.preallocate = 0; // We do not do any preallocation for now.
+
+ /* only preallocate if this is a small write */
+ if (blocks_to_allocate <
+ REISERFS_SB(inode->i_sb)->s_alloc_options.preallocsize)
+ hint.preallocate = 1;
+ else
+ hint.preallocate = 0;
/* Call block allocator to allocate blocks */
res = reiserfs_allocate_blocknrs(&hint, allocated_blocks, blocks_to_allocate, blocks_to_allocate);
diff -puN fs/reiserfs/super.c~reiserfs-prealloc fs/reiserfs/super.c
--- 25/fs/reiserfs/super.c~reiserfs-prealloc Wed Mar 24 15:14:44 2004
+++ 25-akpm/fs/reiserfs/super.c Wed Mar 24 15:14:44 2004
@@ -1298,8 +1298,8 @@ static int reiserfs_fill_super (struct s
REISERFS_SB(s)->s_alloc_options.bits = ( 1 << 5);
/* If file grew past 4 blocks, start preallocation blocks for it. */
REISERFS_SB(s)->s_alloc_options.preallocmin = 4;
- /* Preallocate by 8 blocks (9-1) at once */
- REISERFS_SB(s)->s_alloc_options.preallocsize = 9;
+ /* Preallocate by 16 blocks (17-1) at once */
+ REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
jdev_name = NULL;
if (reiserfs_parse_options (s, (char *) data, &(sbi->s_mount_opt), &blocks, &jdev_name, &commit_max_age) == 0) {
_