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authorBenjamin Marzinski <bmarzins@redhat.com>2011-09-12 18:15:24 -0500
committerSteven Whitehouse <swhiteho@redhat.com>2011-10-21 12:39:49 +0100
commit64dd153c83743af81f20924c6343652d731eeecb (patch)
treee296566ece355c34cb10ad35ce35f43ca58fd036 /fs/gfs2/bmap.c
parentbd5437a7d4307a35f2c7cc19cad706ec0e5d61f0 (diff)
GFS2: rewrite fallocate code to write blocks directly
GFS2's fallocate code currently goes through the page cache. Since it's only writing to the end of the file or to holes in it, it doesn't need to, and it was causing issues on low memory environments. This patch pulls in some of Steve's block allocation work, and uses it to simply allocate the blocks for the file, and zero them out at allocation time. It provides a slight performance increase, and it dramatically simplifies the code. Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/bmap.c')
-rw-r--r--fs/gfs2/bmap.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index 834cd9442a1..97b61955850 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -10,6 +10,7 @@
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
+#include <linux/blkdev.h>
#include <linux/gfs2_ondisk.h>
#include <linux/crc32.h>
@@ -427,12 +428,14 @@ static int gfs2_bmap_alloc(struct inode *inode, const sector_t lblock,
{
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_sbd *sdp = GFS2_SB(inode);
+ struct super_block *sb = sdp->sd_vfs;
struct buffer_head *dibh = mp->mp_bh[0];
u64 bn, dblock = 0;
unsigned n, i, blks, alloced = 0, iblks = 0, branch_start = 0;
unsigned dblks = 0;
unsigned ptrs_per_blk;
const unsigned end_of_metadata = height - 1;
+ int ret;
int eob = 0;
enum alloc_state state;
__be64 *ptr;
@@ -535,6 +538,15 @@ static int gfs2_bmap_alloc(struct inode *inode, const sector_t lblock,
dblock = bn;
while (n-- > 0)
*ptr++ = cpu_to_be64(bn++);
+ if (buffer_zeronew(bh_map)) {
+ ret = sb_issue_zeroout(sb, dblock, dblks,
+ GFP_NOFS);
+ if (ret) {
+ fs_err(sdp,
+ "Failed to zero data buffers\n");
+ clear_buffer_zeronew(bh_map);
+ }
+ }
break;
}
} while ((state != ALLOC_DATA) || !dblock);