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gfs2: Extended attribute readahead

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When gfs2 allocates an inode and its extended attribute block next to
each other at inode create time, the inode's directory entry indicates
that in de_rahead.  In that case, we can readahead the extended
attribute block when we read in the inode.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
This commit is contained in:
Andreas Gruenbacher
2015-11-11 15:00:35 -06:00
committed by Bob Peterson
parent 3dd1dd8c69
commit c8d5770384
8 changed files with 46 additions and 14 deletions
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27
fs/gfs2/meta_io.c
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@@ -187,6 +187,21 @@ struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno)
return bh;
}
static void gfs2_meta_readahead(struct gfs2_glock *gl, u64 blkno)
{
struct buffer_head *bh;
bh = gfs2_getbuf(gl, blkno, 1);
lock_buffer(bh);
if (buffer_uptodate(bh)) {
unlock_buffer(bh);
brelse(bh);
return;
}
bh->b_end_io = end_buffer_read_sync;
submit_bh(READA | REQ_META | REQ_PRIO, bh);
}
/**
* gfs2_meta_read - Read a block from disk
* @gl: The glock covering the block
@@ -198,7 +213,7 @@ struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno)
*/
int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
struct buffer_head **bhp)
int rahead, struct buffer_head **bhp)
{
struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
struct buffer_head *bh;
@@ -213,11 +228,15 @@ int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
lock_buffer(bh);
if (buffer_uptodate(bh)) {
unlock_buffer(bh);
if (rahead)
gfs2_meta_readahead(gl, blkno + 1);
return 0;
}
bh->b_end_io = end_buffer_read_sync;
get_bh(bh);
submit_bh(READ_SYNC | REQ_META | REQ_PRIO, bh);
if (rahead)
gfs2_meta_readahead(gl, blkno + 1);
if (!(flags & DIO_WAIT))
return 0;
@@ -341,8 +360,12 @@ int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num,
struct buffer_head *bh;
int ret = 0;
u32 mtype = height ? GFS2_METATYPE_IN : GFS2_METATYPE_DI;
int rahead = 0;
ret = gfs2_meta_read(gl, num, DIO_WAIT, &bh);
if (num == ip->i_no_addr)
rahead = ip->i_rahead;
ret = gfs2_meta_read(gl, num, DIO_WAIT, rahead, &bh);
if (ret == 0 && gfs2_metatype_check(sdp, bh, mtype)) {
brelse(bh);
ret = -EIO;