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GFS2: Reduce file fragmentation

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This patch reduces GFS2 file fragmentation by pre-reserving blocks. The
resulting improved on disk layout greatly speeds up operations in cases
which would have resulted in interlaced allocation of blocks previously.
A typical example of this is 10 parallel dd processes, each writing to a
file in a common dirctory.

The implementation uses an rbtree of reservations attached to each
resource group (and each inode).

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Bob Peterson
2012-07-19 08:12:40 -04:00
committed by Steven Whitehouse
parent 294f2ad5a5
commit 8e2e004735
9 changed files with 706 additions and 90 deletions
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24
fs/gfs2/file.c
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@@ -383,6 +383,9 @@ static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
if (ret)
return ret;
atomic_set(&ip->i_res->rs_sizehint,
PAGE_CACHE_SIZE / sdp->sd_sb.sb_bsize);
gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
ret = gfs2_glock_nq(&gh);
if (ret)
@@ -571,22 +574,15 @@ fail:
static int gfs2_release(struct inode *inode, struct file *file)
{
struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
struct gfs2_file *fp;
struct gfs2_inode *ip = GFS2_I(inode);
fp = file->private_data;
kfree(file->private_data);
file->private_data = NULL;
if ((file->f_mode & FMODE_WRITE) && ip->i_res &&
if ((file->f_mode & FMODE_WRITE) &&
(atomic_read(&inode->i_writecount) == 1))
gfs2_rs_delete(ip);
if (gfs2_assert_warn(sdp, fp))
return -EIO;
kfree(fp);
return 0;
}
@@ -662,14 +658,18 @@ static ssize_t gfs2_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
{
struct file *file = iocb->ki_filp;
size_t writesize = iov_length(iov, nr_segs);
struct dentry *dentry = file->f_dentry;
struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
struct gfs2_sbd *sdp;
int ret;
sdp = GFS2_SB(file->f_mapping->host);
ret = gfs2_rs_alloc(ip);
if (ret)
return ret;
atomic_set(&ip->i_res->rs_sizehint, writesize / sdp->sd_sb.sb_bsize);
if (file->f_flags & O_APPEND) {
struct gfs2_holder gh;
@@ -795,6 +795,8 @@ static long gfs2_fallocate(struct file *file, int mode, loff_t offset,
if (unlikely(error))
goto out_uninit;
atomic_set(&ip->i_res->rs_sizehint, len / sdp->sd_sb.sb_bsize);
while (len > 0) {
if (len < bytes)
bytes = len;
@@ -803,10 +805,6 @@ static long gfs2_fallocate(struct file *file, int mode, loff_t offset,
offset += bytes;
continue;
}
error = gfs2_rindex_update(sdp);
if (error)
goto out_unlock;
error = gfs2_quota_lock_check(ip);
if (error)
goto out_unlock;