Linux Archive

Linux Archive (http://www.linux-archive.org/)
-   Cluster Development (http://www.linux-archive.org/cluster-development/)
-   -   GFS2: eliminate log elements and simplify (http://www.linux-archive.org/cluster-development/661856-gfs2-eliminate-log-elements-simplify.html)

Bob Peterson 05-01-2012 04:00 PM

GFS2: eliminate log elements and simplify
 
----- Original Message -----
| Hi,
|
| On Fri, 2012-04-27 at 15:49 -0400, Bob Peterson wrote:
| > Hi,
| >
| > I don't know if you're going to like this one or not...
| >
| > This patch eliminates the gfs2_log_element data structure and
| > rolls its two components into the gfs2_bufdata. This makes the code
| > easier to understand and makes it easier to migrate to a rbtree
| > to keep the list sorted.
| >
| That looks good, but can we call the "new" fields bd_list and bd_ops
| rather than retaining the le in the names?
|
| Steve.

Hi,

Good idea. Here is the revised patch.

This patch eliminates the gfs2_log_element data structure and
rolls its two components into the gfs2_bufdata. This makes the code
easier to understand and makes it easier to migrate to a rbtree
to keep the list sorted.

Regards,

Bob Peterson
Red Hat File Systems

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
---
diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c
index 695bbe1..e80a464 100644
--- a/fs/gfs2/aops.c
+++ b/fs/gfs2/aops.c
@@ -942,8 +942,8 @@ static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh)
clear_buffer_dirty(bh);
bd = bh->b_private;
if (bd) {
- if (!list_empty(&bd->bd_le.le_list) && !buffer_pinned(bh))
- list_del_init(&bd->bd_le.le_list);
+ if (!list_empty(&bd->bd_list) && !buffer_pinned(bh))
+ list_del_init(&bd->bd_list);
else
gfs2_remove_from_journal(bh, current->journal_info, 0);
}
@@ -1083,9 +1083,9 @@ int gfs2_releasepage(struct page *page, gfp_t gfp_mask)
bd = bh->b_private;
if (bd) {
gfs2_assert_warn(sdp, bd->bd_bh == bh);
- if (!list_empty(&bd->bd_le.le_list)) {
+ if (!list_empty(&bd->bd_list)) {
if (!buffer_pinned(bh))
- list_del_init(&bd->bd_le.le_list);
+ list_del_init(&bd->bd_list);
else
bd = NULL;
}
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index e773fbc..ee14625 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -26,7 +26,7 @@
#define DIO_METADATA 0x00000020

struct gfs2_log_operations;
-struct gfs2_log_element;
+struct gfs2_bufdata;
struct gfs2_holder;
struct gfs2_glock;
struct gfs2_quota_data;
@@ -52,7 +52,7 @@ struct gfs2_log_header_host {
*/

struct gfs2_log_operations {
- void (*lo_add) (struct gfs2_sbd *sdp, struct gfs2_log_element *le);
+ void (*lo_add) (struct gfs2_sbd *sdp, struct gfs2_bufdata *bd);
void (*lo_before_commit) (struct gfs2_sbd *sdp);
void (*lo_after_commit) (struct gfs2_sbd *sdp, struct gfs2_ail *ai);
void (*lo_before_scan) (struct gfs2_jdesc *jd,
@@ -64,11 +64,6 @@ struct gfs2_log_operations {
const char *lo_name;
};

-struct gfs2_log_element {
- struct list_head le_list;
- const struct gfs2_log_operations *le_ops;
-};
-
#define GBF_FULL 1

struct gfs2_bitmap {
@@ -120,7 +115,8 @@ struct gfs2_bufdata {
struct gfs2_glock *bd_gl;
u64 bd_blkno;

- struct gfs2_log_element bd_le;
+ struct list_head bd_list;
+ const struct gfs2_log_operations *bd_ops;

struct gfs2_ail *bd_ail;
struct list_head bd_ail_st_list;
diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index db9cb18..f4beeb9 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -486,8 +486,8 @@ static int bd_cmp(void *priv, struct list_head *a, struct list_head *b)
{
struct gfs2_bufdata *bda, *bdb;

- bda = list_entry(a, struct gfs2_bufdata, bd_le.le_list);
- bdb = list_entry(b, struct gfs2_bufdata, bd_le.le_list);
+ bda = list_entry(a, struct gfs2_bufdata, bd_list);
+ bdb = list_entry(b, struct gfs2_bufdata, bd_list);

if (bda->bd_bh->b_blocknr < bdb->bd_bh->b_blocknr)
return -1;
@@ -505,8 +505,8 @@ static void gfs2_ordered_write(struct gfs2_sbd *sdp)
gfs2_log_lock(sdp);
list_sort(NULL, &sdp->sd_log_le_ordered, &bd_cmp);
while (!list_empty(&sdp->sd_log_le_ordered)) {
- bd = list_entry(sdp->sd_log_le_ordered.next, struct gfs2_bufdata, bd_le.le_list);
- list_move(&bd->bd_le.le_list, &written);
+ bd = list_entry(sdp->sd_log_le_ordered.next, struct gfs2_bufdata, bd_list);
+ list_move(&bd->bd_list, &written);
bh = bd->bd_bh;
if (!buffer_dirty(bh))
continue;
@@ -533,7 +533,7 @@ static void gfs2_ordered_wait(struct gfs2_sbd *sdp)

gfs2_log_lock(sdp);
while (!list_empty(&sdp->sd_log_le_ordered)) {
- bd = list_entry(sdp->sd_log_le_ordered.prev, struct gfs2_bufdata, bd_le.le_list);
+ bd = list_entry(sdp->sd_log_le_ordered.prev, struct gfs2_bufdata, bd_list);
bh = bd->bd_bh;
if (buffer_locked(bh)) {
get_bh(bh);
@@ -543,7 +543,7 @@ static void gfs2_ordered_wait(struct gfs2_sbd *sdp)
gfs2_log_lock(sdp);
continue;
}
- list_del_init(&bd->bd_le.le_list);
+ list_del_init(&bd->bd_list);
}
gfs2_log_unlock(sdp);
}
diff --git a/fs/gfs2/lops.c b/fs/gfs2/lops.c
index 11fedb5..852c1be 100644
--- a/fs/gfs2/lops.c
+++ b/fs/gfs2/lops.c
@@ -388,9 +388,8 @@ static struct page *gfs2_get_log_desc(struct gfs2_sbd *sdp, u32 ld_type,
return page;
}

-static void buf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
+static void buf_lo_add(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
{
- struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
struct gfs2_meta_header *mh;
struct gfs2_trans *tr;

@@ -398,7 +397,7 @@ static void buf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
gfs2_log_lock(sdp);
tr = current->journal_info;
tr->tr_touched = 1;
- if (!list_empty(&le->le_list))
+ if (!list_empty(&bd->bd_list))
goto out;
set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
@@ -408,7 +407,7 @@ static void buf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
mh->__pad0 = cpu_to_be64(0);
mh->mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid);
sdp->sd_log_num_buf++;
- list_add(&le->le_list, &sdp->sd_log_le_buf);
+ list_add(&bd->bd_list, &sdp->sd_log_le_buf);
tr->tr_num_buf_new++;
out:
gfs2_log_unlock(sdp);
@@ -440,7 +439,7 @@ static void gfs2_before_commit(struct gfs2_sbd *sdp, unsigned int limit,
__be64 *ptr;

gfs2_log_lock(sdp);
- bd1 = bd2 = list_prepare_entry(bd1, blist, bd_le.le_list);
+ bd1 = bd2 = list_prepare_entry(bd1, blist, bd_list);
while(total) {
num = total;
if (total > limit)
@@ -452,7 +451,7 @@ static void gfs2_before_commit(struct gfs2_sbd *sdp, unsigned int limit,
ptr = (__be64 *)(ld + 1);

n = 0;
- list_for_each_entry_continue(bd1, blist, bd_le.le_list) {
+ list_for_each_entry_continue(bd1, blist, bd_list) {
*ptr++ = cpu_to_be64(bd1->bd_bh->b_blocknr);
if (is_databuf) {
gfs2_check_magic(bd1->bd_bh);
@@ -467,7 +466,7 @@ static void gfs2_before_commit(struct gfs2_sbd *sdp, unsigned int limit,
gfs2_log_lock(sdp);

n = 0;
- list_for_each_entry_continue(bd2, blist, bd_le.le_list) {
+ list_for_each_entry_continue(bd2, blist, bd_list) {
get_bh(bd2->bd_bh);
gfs2_log_unlock(sdp);
lock_buffer(bd2->bd_bh);
@@ -513,8 +512,8 @@ static void buf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
struct gfs2_bufdata *bd;

while (!list_empty(head)) {
- bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
- list_del_init(&bd->bd_le.le_list);
+ bd = list_entry(head->next, struct gfs2_bufdata, bd_list);
+ list_del_init(&bd->bd_list);
sdp->sd_log_num_buf--;

gfs2_unpin(sdp, bd->bd_bh, ai);
@@ -601,9 +600,8 @@ static void buf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
jd->jd_jid, sdp->sd_replayed_blocks, sdp->sd_found_blocks);
}

-static void revoke_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
+static void revoke_lo_add(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
{
- struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
struct gfs2_glock *gl = bd->bd_gl;
struct gfs2_trans *tr;

@@ -613,7 +611,7 @@ static void revoke_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
sdp->sd_log_num_revoke++;
atomic_inc(&gl->gl_revokes);
set_bit(GLF_LFLUSH, &gl->gl_flags);
- list_add(&le->le_list, &sdp->sd_log_le_revoke);
+ list_add(&bd->bd_list, &sdp->sd_log_le_revoke);
}

static void revoke_lo_before_commit(struct gfs2_sbd *sdp)
@@ -634,7 +632,7 @@ static void revoke_lo_before_commit(struct gfs2_sbd *sdp)
ld = page_address(page);
offset = sizeof(struct gfs2_log_descriptor);

- list_for_each_entry(bd, head, bd_le.le_list) {
+ list_for_each_entry(bd, head, bd_list) {
sdp->sd_log_num_revoke--;

if (offset + sizeof(u64) > sdp->sd_sb.sb_bsize) {
@@ -664,8 +662,8 @@ static void revoke_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
struct gfs2_glock *gl;

while (!list_empty(head)) {
- bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
- list_del_init(&bd->bd_le.le_list);
+ bd = list_entry(head->next, struct gfs2_bufdata, bd_list);
+ list_del_init(&bd->bd_list);
gl = bd->bd_gl;
atomic_dec(&gl->gl_revokes);
clear_bit(GLF_LFLUSH, &gl->gl_flags);
@@ -768,9 +766,8 @@ static void revoke_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
* blocks, which isn't an enormous overhead but twice as much as
* for normal metadata blocks.
*/
-static void databuf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
+static void databuf_lo_add(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
{
- struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
struct gfs2_trans *tr = current->journal_info;
struct address_space *mapping = bd->bd_bh->b_page->mapping;
struct gfs2_inode *ip = GFS2_I(mapping->host);
@@ -779,7 +776,7 @@ static void databuf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
gfs2_log_lock(sdp);
if (tr)
tr->tr_touched = 1;
- if (!list_empty(&le->le_list))
+ if (!list_empty(&bd->bd_list))
goto out;
set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
@@ -787,9 +784,9 @@ static void databuf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
gfs2_pin(sdp, bd->bd_bh);
tr->tr_num_databuf_new++;
sdp->sd_log_num_databuf++;
- list_add_tail(&le->le_list, &sdp->sd_log_le_databuf);
+ list_add_tail(&bd->bd_list, &sdp->sd_log_le_databuf);
} else {
- list_add_tail(&le->le_list, &sdp->sd_log_le_ordered);
+ list_add_tail(&bd->bd_list, &sdp->sd_log_le_ordered);
}
out:
gfs2_log_unlock(sdp);
@@ -885,8 +882,8 @@ static void databuf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
struct gfs2_bufdata *bd;

while (!list_empty(head)) {
- bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
- list_del_init(&bd->bd_le.le_list);
+ bd = list_entry(head->next, struct gfs2_bufdata, bd_list);
+ list_del_init(&bd->bd_list);
sdp->sd_log_num_databuf--;
gfs2_unpin(sdp, bd->bd_bh, ai);
}
diff --git a/fs/gfs2/lops.h b/fs/gfs2/lops.h
index 825356d..954a330 100644
--- a/fs/gfs2/lops.h
+++ b/fs/gfs2/lops.h
@@ -46,17 +46,17 @@ static inline unsigned int databuf_limit(struct gfs2_sbd *sdp)
return limit;
}

-static inline void lops_init_le(struct gfs2_log_element *le,
+static inline void lops_init_le(struct gfs2_bufdata *bd,
const struct gfs2_log_operations *lops)
{
- INIT_LIST_HEAD(&le->le_list);
- le->le_ops = lops;
+ INIT_LIST_HEAD(&bd->bd_list);
+ bd->bd_ops = lops;
}

-static inline void lops_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
+static inline void lops_add(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
{
- if (le->le_ops->lo_add)
- le->le_ops->lo_add(sdp, le);
+ if (bd->bd_ops->lo_add)
+ bd->bd_ops->lo_add(sdp, bd);
}

static inline void lops_before_commit(struct gfs2_sbd *sdp)
diff --git a/fs/gfs2/meta_io.c b/fs/gfs2/meta_io.c
index 8a82a4d..7f69ae2 100644
--- a/fs/gfs2/meta_io.c
+++ b/fs/gfs2/meta_io.c
@@ -294,9 +294,9 @@ void gfs2_attach_bufdata(struct gfs2_glock *gl, struct buffer_head *bh,
bd->bd_gl = gl;

if (meta)
- lops_init_le(&bd->bd_le, &gfs2_buf_lops);
+ lops_init_le(bd, &gfs2_buf_lops);
else
- lops_init_le(&bd->bd_le, &gfs2_databuf_lops);
+ lops_init_le(bd, &gfs2_databuf_lops);
bh->b_private = bd;

if (meta)
@@ -312,7 +312,7 @@ void gfs2_remove_from_journal(struct buffer_head *bh, struct gfs2_trans *tr, int
if (test_clear_buffer_pinned(bh)) {
trace_gfs2_pin(bd, 0);
atomic_dec(&sdp->sd_log_pinned);
- list_del_init(&bd->bd_le.le_list);
+ list_del_init(&bd->bd_list);
if (meta) {
gfs2_assert_warn(sdp, sdp->sd_log_num_buf);
sdp->sd_log_num_buf--;
diff --git a/fs/gfs2/trans.c b/fs/gfs2/trans.c
index 8fb6317..ad3e2fb 100644
--- a/fs/gfs2/trans.c
+++ b/fs/gfs2/trans.c
@@ -158,16 +158,16 @@ void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh, int meta)
gfs2_attach_bufdata(gl, bh, meta);
bd = bh->b_private;
}
- lops_add(sdp, &bd->bd_le);
+ lops_add(sdp, bd);
}

void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
{
- BUG_ON(!list_empty(&bd->bd_le.le_list));
+ BUG_ON(!list_empty(&bd->bd_list));
BUG_ON(!list_empty(&bd->bd_ail_st_list));
BUG_ON(!list_empty(&bd->bd_ail_gl_list));
- lops_init_le(&bd->bd_le, &gfs2_revoke_lops);
- lops_add(sdp, &bd->bd_le);
+ lops_init_le(bd, &gfs2_revoke_lops);
+ lops_add(sdp, bd);
}

void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len)
@@ -177,9 +177,9 @@ void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len)
unsigned int n = len;

gfs2_log_lock(sdp);
- list_for_each_entry_safe(bd, tmp, &sdp->sd_log_le_revoke, bd_le.le_list) {
+ list_for_each_entry_safe(bd, tmp, &sdp->sd_log_le_revoke, bd_list) {
if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) {
- list_del_init(&bd->bd_le.le_list);
+ list_del_init(&bd->bd_list);
gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
sdp->sd_log_num_revoke--;
kmem_cache_free(gfs2_bufdata_cachep, bd);


All times are GMT. The time now is 09:23 AM.

VBulletin, Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO ©2007, Crawlability, Inc.