[Cluster-devel] [PATCH 04/19] gfs2: Extended attribute readahead
Bob Peterson
rpeterso at redhat.com
Tue Jan 12 17:54:54 UTC 2016
From: Andreas Gruenbacher <agruenba at redhat.com>
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 at redhat.com>
Signed-off-by: Bob Peterson <rpeterso at redhat.com>
---
fs/gfs2/dir.c | 15 +++++++++++----
fs/gfs2/incore.h | 1 +
fs/gfs2/meta_io.c | 27 +++++++++++++++++++++++++--
fs/gfs2/meta_io.h | 2 +-
fs/gfs2/quota.c | 2 +-
fs/gfs2/rgrp.c | 2 +-
fs/gfs2/super.c | 1 +
fs/gfs2/xattr.c | 10 +++++-----
8 files changed, 46 insertions(+), 14 deletions(-)
diff --git a/fs/gfs2/dir.c b/fs/gfs2/dir.c
index ad8a5b7..c248659 100644
--- a/fs/gfs2/dir.c
+++ b/fs/gfs2/dir.c
@@ -108,7 +108,7 @@ static int gfs2_dir_get_existing_buffer(struct gfs2_inode *ip, u64 block,
struct buffer_head *bh;
int error;
- error = gfs2_meta_read(ip->i_gl, block, DIO_WAIT, &bh);
+ error = gfs2_meta_read(ip->i_gl, block, DIO_WAIT, 0, &bh);
if (error)
return error;
if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_JD)) {
@@ -305,7 +305,7 @@ static int gfs2_dir_read_data(struct gfs2_inode *ip, __be64 *buf,
BUG_ON(extlen < 1);
bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
} else {
- error = gfs2_meta_read(ip->i_gl, dblock, DIO_WAIT, &bh);
+ error = gfs2_meta_read(ip->i_gl, dblock, DIO_WAIT, 0, &bh);
if (error)
goto fail;
}
@@ -723,7 +723,7 @@ static int get_leaf(struct gfs2_inode *dip, u64 leaf_no,
{
int error;
- error = gfs2_meta_read(dip->i_gl, leaf_no, DIO_WAIT, bhp);
+ error = gfs2_meta_read(dip->i_gl, leaf_no, DIO_WAIT, 0, bhp);
if (!error && gfs2_metatype_check(GFS2_SB(&dip->i_inode), *bhp, GFS2_METATYPE_LF)) {
/* pr_info("block num=%llu\n", leaf_no); */
error = -EIO;
@@ -1560,15 +1560,22 @@ struct inode *gfs2_dir_search(struct inode *dir, const struct qstr *name,
dent = gfs2_dirent_search(dir, name, gfs2_dirent_find, &bh);
if (dent) {
+ struct inode *inode;
+ u16 rahead;
+
if (IS_ERR(dent))
return ERR_CAST(dent);
dtype = be16_to_cpu(dent->de_type);
+ rahead = be16_to_cpu(dent->de_rahead);
addr = be64_to_cpu(dent->de_inum.no_addr);
formal_ino = be64_to_cpu(dent->de_inum.no_formal_ino);
brelse(bh);
if (fail_on_exist)
return ERR_PTR(-EEXIST);
- return gfs2_inode_lookup(dir->i_sb, dtype, addr, formal_ino, 0);
+ inode = gfs2_inode_lookup(dir->i_sb, dtype, addr, formal_ino, 0);
+ if (!IS_ERR(inode))
+ GFS2_I(inode)->i_rahead = rahead;
+ return inode;
}
return ERR_PTR(-ENOENT);
}
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index de7b4f9..77e7784 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -402,6 +402,7 @@ struct gfs2_inode {
u32 i_diskflags;
u8 i_height;
u8 i_depth;
+ u16 i_rahead;
};
/*
diff --git a/fs/gfs2/meta_io.c b/fs/gfs2/meta_io.c
index 0e1d4be..0f24828 100644
--- a/fs/gfs2/meta_io.c
+++ b/fs/gfs2/meta_io.c
@@ -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;
+
+ if (num == ip->i_no_addr)
+ rahead = ip->i_rahead;
- ret = gfs2_meta_read(gl, num, DIO_WAIT, &bh);
+ ret = gfs2_meta_read(gl, num, DIO_WAIT, rahead, &bh);
if (ret == 0 && gfs2_metatype_check(sdp, bh, mtype)) {
brelse(bh);
ret = -EIO;
diff --git a/fs/gfs2/meta_io.h b/fs/gfs2/meta_io.h
index 8ca1615..c5086c8 100644
--- a/fs/gfs2/meta_io.h
+++ b/fs/gfs2/meta_io.h
@@ -53,7 +53,7 @@ static inline struct gfs2_sbd *gfs2_mapping2sbd(struct address_space *mapping)
extern struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno);
extern int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
- struct buffer_head **bhp);
+ int rahead, struct buffer_head **bhp);
extern int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh);
extern struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno,
int create);
diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c
index 3a31226..e01298d 100644
--- a/fs/gfs2/quota.c
+++ b/fs/gfs2/quota.c
@@ -388,7 +388,7 @@ static int bh_get(struct gfs2_quota_data *qd)
error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
if (error)
goto fail;
- error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh);
+ error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, 0, &bh);
if (error)
goto fail;
error = -EIO;
diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index c134c04..ac0a65d 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -1158,7 +1158,7 @@ static int gfs2_rgrp_bh_get(struct gfs2_rgrpd *rgd)
for (x = 0; x < length; x++) {
bi = rgd->rd_bits + x;
- error = gfs2_meta_read(gl, rgd->rd_addr + x, 0, &bi->bi_bh);
+ error = gfs2_meta_read(gl, rgd->rd_addr + x, 0, 0, &bi->bi_bh);
if (error)
goto fail;
}
diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
index 894fb01..8f94282 100644
--- a/fs/gfs2/super.c
+++ b/fs/gfs2/super.c
@@ -1633,6 +1633,7 @@ static struct inode *gfs2_alloc_inode(struct super_block *sb)
ip->i_gl = NULL;
ip->i_rgd = NULL;
ip->i_res = NULL;
+ ip->i_rahead = 0;
}
return &ip->i_inode;
}
diff --git a/fs/gfs2/xattr.c b/fs/gfs2/xattr.c
index 4c096fa..f0fe884 100644
--- a/fs/gfs2/xattr.c
+++ b/fs/gfs2/xattr.c
@@ -119,7 +119,7 @@ static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
__be64 *eablk, *end;
int error;
- error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &bh);
+ error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &bh);
if (error)
return error;
@@ -143,7 +143,7 @@ static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
break;
bn = be64_to_cpu(*eablk);
- error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, &eabh);
+ error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, 0, &eabh);
if (error)
break;
error = ea_foreach_i(ip, eabh, ea_call, data);
@@ -477,7 +477,7 @@ static int gfs2_iter_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
return -ENOMEM;
for (x = 0; x < nptrs; x++) {
- error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
+ error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0, 0,
bh + x);
if (error) {
while (x--)
@@ -977,7 +977,7 @@ static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
__be64 *end;
- error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT,
+ error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0,
&indbh);
if (error)
return error;
@@ -1303,7 +1303,7 @@ static int ea_dealloc_indirect(struct gfs2_inode *ip)
memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
- error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &indbh);
+ error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &indbh);
if (error)
return error;
--
2.5.0
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