summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorJosef Bacik <josef@redhat.com>2011-03-22 11:00:46 -0400
committerChris Mason <chris.mason@oracle.com>2011-03-25 19:08:18 -0400
commit98bc3149fad639c8f50c7110b961a2a2fe085eed (patch)
tree76b102e79a9adde87c4e93f475db643567c393da
parent4e69b598f6cfb0940b75abf7e179d6020e94ad1e (diff)
downloadlinux-98bc3149fad639c8f50c7110b961a2a2fe085eed.tar.bz2
Btrfs: don't allocate dip->csums when doing writes
When doing direct writes we store the checksums in the ordered sum stuff in the ordered extent for writing them when the write completes, so we don't even use the dip->csums array. So if we're writing, don't bother allocating dip->csums since we won't use it anyway. Thanks, Signed-off-by: Josef Bacik <josef@redhat.com>
-rw-r--r--fs/btrfs/inode.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index e010000d4bc9..570cd44fe91b 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -5944,6 +5944,7 @@ static int btrfs_submit_direct_hook(int rw, struct btrfs_dio_private *dip,
int nr_pages = 0;
u32 *csums = dip->csums;
int ret = 0;
+ int write = rw & REQ_WRITE;
bio = btrfs_dio_bio_alloc(orig_bio->bi_bdev, start_sector, GFP_NOFS);
if (!bio)
@@ -5980,7 +5981,8 @@ static int btrfs_submit_direct_hook(int rw, struct btrfs_dio_private *dip,
goto out_err;
}
- if (!skip_sum)
+ /* Write's use the ordered csums */
+ if (!write && !skip_sum)
csums = csums + nr_pages;
start_sector += submit_len >> 9;
file_offset += submit_len;
@@ -6048,7 +6050,8 @@ static void btrfs_submit_direct(int rw, struct bio *bio, struct inode *inode,
}
dip->csums = NULL;
- if (!skip_sum) {
+ /* Write's use the ordered csum stuff, so we don't need dip->csums */
+ if (!write && !skip_sum) {
dip->csums = kmalloc(sizeof(u32) * bio->bi_vcnt, GFP_NOFS);
if (!dip->csums) {
kfree(dip);