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Old 04-16-2012, 04:30 PM
Steven Whitehouse
 
Default GFS2: Remove bd_list_tr

>From 5898a16835a12d9275063af212dd6005ee88bc2e Mon Sep 17 00:00:00 2001
From: Steven Whitehouse <swhiteho@redhat.com>
Date: Mon, 16 Apr 2012 16:40:56 +0100
Subject: GFS2: Remove bd_list_tr

This is another clean up in the logging code. This per-transaction
list was largely unused. Its main function was to ensure that the
number of buffers in a transaction was correct, however that counter
was only used to check the number of buffers in the bd_list_tr, plus
an assert at the end of each transaction. With the assert now changed
to use the calculated buffer counts, we can remove both bd_list_tr and
its associated counter.

This should make the code easier to understand as well as shrinking
a couple of structures.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c
index 56dc1f0..a627b3e 100644
--- a/fs/gfs2/aops.c
+++ b/fs/gfs2/aops.c
@@ -1084,7 +1084,6 @@ int gfs2_releasepage(struct page *page, gfp_t gfp_mask)
bd = bh->b_private;
if (bd) {
gfs2_assert_warn(sdp, bd->bd_bh == bh);
- gfs2_assert_warn(sdp, list_empty(&bd->bd_list_tr));
if (!list_empty(&bd->bd_le.le_list)) {
if (!buffer_pinned(bh))
list_del_init(&bd->bd_le.le_list);
diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c
index 1656df7..cd3e6fb 100644
--- a/fs/gfs2/glops.c
+++ b/fs/gfs2/glops.c
@@ -94,7 +94,6 @@ static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
/* A shortened, inline version of gfs2_trans_begin() */
tr.tr_reserved = 1 + gfs2_struct2blk(sdp, tr.tr_revokes, sizeof(u64));
tr.tr_ip = (unsigned long)__builtin_return_address(0);
- INIT_LIST_HEAD(&tr.tr_list_buf);
gfs2_log_reserve(sdp, tr.tr_reserved);
BUG_ON(current->journal_info);
current->journal_info = &tr;
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index dd97f64..e773fbc 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -118,13 +118,7 @@ TAS_BUFFER_FNS(Zeronew, zeronew)
struct gfs2_bufdata {
struct buffer_head *bd_bh;
struct gfs2_glock *bd_gl;
-
- union {
- struct list_head list_tr;
- u64 blkno;
- } u;
-#define bd_list_tr u.list_tr
-#define bd_blkno u.blkno
+ u64 bd_blkno;

struct gfs2_log_element bd_le;

@@ -411,13 +405,10 @@ struct gfs2_trans {

int tr_touched;

- unsigned int tr_num_buf;
unsigned int tr_num_buf_new;
unsigned int tr_num_databuf_new;
unsigned int tr_num_buf_rm;
unsigned int tr_num_databuf_rm;
- struct list_head tr_list_buf;
-
unsigned int tr_num_revoke;
unsigned int tr_num_revoke_rm;
};
diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index f5eacb3..2307218 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -696,21 +696,6 @@ static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
gfs2_log_unlock(sdp);
}

-static void buf_lo_incore_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
-{
- struct list_head *head = &tr->tr_list_buf;
- struct gfs2_bufdata *bd;
-
- gfs2_log_lock(sdp);
- while (!list_empty(head)) {
- bd = list_entry(head->next, struct gfs2_bufdata, bd_list_tr);
- list_del_init(&bd->bd_list_tr);
- tr->tr_num_buf--;
- }
- gfs2_log_unlock(sdp);
- gfs2_assert_warn(sdp, !tr->tr_num_buf);
-}
-
/**
* gfs2_log_commit - Commit a transaction to the log
* @sdp: the filesystem
@@ -729,8 +714,6 @@ static void buf_lo_incore_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
{
log_refund(sdp, tr);
- buf_lo_incore_commit(sdp, tr);
-
up_read(&sdp->sd_log_flush_lock);

if (atomic_read(&sdp->sd_log_pinned) > atomic_read(&sdp->sd_log_thresh1) ||
diff --git a/fs/gfs2/lops.c b/fs/gfs2/lops.c
index 7882671..e9709da 100644
--- a/fs/gfs2/lops.c
+++ b/fs/gfs2/lops.c
@@ -396,12 +396,8 @@ static void buf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)

lock_buffer(bd->bd_bh);
gfs2_log_lock(sdp);
- if (!list_empty(&bd->bd_list_tr))
- goto out;
tr = current->journal_info;
tr->tr_touched = 1;
- tr->tr_num_buf++;
- list_add(&bd->bd_list_tr, &tr->tr_list_buf);
if (!list_empty(&le->le_list))
goto out;
set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
@@ -781,18 +777,10 @@ static void databuf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)

lock_buffer(bd->bd_bh);
gfs2_log_lock(sdp);
- if (tr) {
- if (!list_empty(&bd->bd_list_tr))
- goto out;
+ if (tr)
tr->tr_touched = 1;
- if (gfs2_is_jdata(ip)) {
- tr->tr_num_buf++;
- list_add(&bd->bd_list_tr, &tr->tr_list_buf);
- }
- }
if (!list_empty(&le->le_list))
goto out;
-
set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
if (gfs2_is_jdata(ip)) {
diff --git a/fs/gfs2/meta_io.c b/fs/gfs2/meta_io.c
index 181586e..8a82a4d 100644
--- a/fs/gfs2/meta_io.c
+++ b/fs/gfs2/meta_io.c
@@ -293,7 +293,6 @@ void gfs2_attach_bufdata(struct gfs2_glock *gl, struct buffer_head *bh,
bd->bd_bh = bh;
bd->bd_gl = gl;

- INIT_LIST_HEAD(&bd->bd_list_tr);
if (meta)
lops_init_le(&bd->bd_le, &gfs2_buf_lops);
else
diff --git a/fs/gfs2/trans.c b/fs/gfs2/trans.c
index 86ac75d..8fb6317 100644
--- a/fs/gfs2/trans.c
+++ b/fs/gfs2/trans.c
@@ -50,8 +50,6 @@ int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks,
if (revokes)
tr->tr_reserved += gfs2_struct2blk(sdp, revokes,
sizeof(u64));
- INIT_LIST_HEAD(&tr->tr_list_buf);
-
gfs2_holder_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &tr->tr_t_gh);

error = gfs2_glock_nq(&tr->tr_t_gh);
@@ -93,10 +91,21 @@ static void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks)
up_read(&sdp->sd_log_flush_lock);
}

+static void gfs2_print_trans(const struct gfs2_trans *tr)
+{
+ print_symbol(KERN_WARNING "GFS2: Transaction created at: %s
", tr->tr_ip);
+ printk(KERN_WARNING "GFS2: blocks=%u revokes=%u reserved=%u touched=%d
",
+ tr->tr_blocks, tr->tr_revokes, tr->tr_reserved, tr->tr_touched);
+ printk(KERN_WARNING "GFS2: Buf %u/%u Databuf %u/%u Revoke %u/%u
",
+ tr->tr_num_buf_new, tr->tr_num_buf_rm,
+ tr->tr_num_databuf_new, tr->tr_num_databuf_rm,
+ tr->tr_num_revoke, tr->tr_num_revoke_rm);
+}
+
void gfs2_trans_end(struct gfs2_sbd *sdp)
{
struct gfs2_trans *tr = current->journal_info;
-
+ s64 nbuf;
BUG_ON(!tr);
current->journal_info = NULL;

@@ -110,16 +119,13 @@ void gfs2_trans_end(struct gfs2_sbd *sdp)
return;
}

- if (gfs2_assert_withdraw(sdp, tr->tr_num_buf <= tr->tr_blocks)) {
- fs_err(sdp, "tr_num_buf = %u, tr_blocks = %u ",
- tr->tr_num_buf, tr->tr_blocks);
- print_symbol(KERN_WARNING "GFS2: Transaction created at: %s
", tr->tr_ip);
- }
- if (gfs2_assert_withdraw(sdp, tr->tr_num_revoke <= tr->tr_revokes)) {
- fs_err(sdp, "tr_num_revoke = %u, tr_revokes = %u ",
- tr->tr_num_revoke, tr->tr_revokes);
- print_symbol(KERN_WARNING "GFS2: Transaction created at: %s
", tr->tr_ip);
- }
+ nbuf = tr->tr_num_buf_new + tr->tr_num_databuf_new;
+ nbuf -= tr->tr_num_buf_rm;
+ nbuf -= tr->tr_num_databuf_rm;
+
+ if (gfs2_assert_withdraw(sdp, (nbuf <= tr->tr_blocks) &&
+ (tr->tr_num_revoke <= tr->tr_revokes)))
+ gfs2_print_trans(tr);

gfs2_log_commit(sdp, tr);
if (tr->tr_t_gh.gh_gl) {
--
1.7.4
 
Old 05-17-2012, 12:23 PM
Steven Whitehouse
 
Default GFS2: Remove bd_list_tr

This is another clean up in the logging code. This per-transaction
list was largely unused. Its main function was to ensure that the
number of buffers in a transaction was correct, however that counter
was only used to check the number of buffers in the bd_list_tr, plus
an assert at the end of each transaction. With the assert now changed
to use the calculated buffer counts, we can remove both bd_list_tr and
its associated counter.

This should make the code easier to understand as well as shrinking
a couple of structures.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c
index 56dc1f0..a627b3e 100644
--- a/fs/gfs2/aops.c
+++ b/fs/gfs2/aops.c
@@ -1084,7 +1084,6 @@ int gfs2_releasepage(struct page *page, gfp_t gfp_mask)
bd = bh->b_private;
if (bd) {
gfs2_assert_warn(sdp, bd->bd_bh == bh);
- gfs2_assert_warn(sdp, list_empty(&bd->bd_list_tr));
if (!list_empty(&bd->bd_le.le_list)) {
if (!buffer_pinned(bh))
list_del_init(&bd->bd_le.le_list);
diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c
index 1656df7..cd3e6fb 100644
--- a/fs/gfs2/glops.c
+++ b/fs/gfs2/glops.c
@@ -94,7 +94,6 @@ static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
/* A shortened, inline version of gfs2_trans_begin() */
tr.tr_reserved = 1 + gfs2_struct2blk(sdp, tr.tr_revokes, sizeof(u64));
tr.tr_ip = (unsigned long)__builtin_return_address(0);
- INIT_LIST_HEAD(&tr.tr_list_buf);
gfs2_log_reserve(sdp, tr.tr_reserved);
BUG_ON(current->journal_info);
current->journal_info = &tr;
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index dd97f64..e773fbc 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -118,13 +118,7 @@ TAS_BUFFER_FNS(Zeronew, zeronew)
struct gfs2_bufdata {
struct buffer_head *bd_bh;
struct gfs2_glock *bd_gl;
-
- union {
- struct list_head list_tr;
- u64 blkno;
- } u;
-#define bd_list_tr u.list_tr
-#define bd_blkno u.blkno
+ u64 bd_blkno;

struct gfs2_log_element bd_le;

@@ -411,13 +405,10 @@ struct gfs2_trans {

int tr_touched;

- unsigned int tr_num_buf;
unsigned int tr_num_buf_new;
unsigned int tr_num_databuf_new;
unsigned int tr_num_buf_rm;
unsigned int tr_num_databuf_rm;
- struct list_head tr_list_buf;
-
unsigned int tr_num_revoke;
unsigned int tr_num_revoke_rm;
};
diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index f5eacb3..2307218 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -696,21 +696,6 @@ static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
gfs2_log_unlock(sdp);
}

-static void buf_lo_incore_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
-{
- struct list_head *head = &tr->tr_list_buf;
- struct gfs2_bufdata *bd;
-
- gfs2_log_lock(sdp);
- while (!list_empty(head)) {
- bd = list_entry(head->next, struct gfs2_bufdata, bd_list_tr);
- list_del_init(&bd->bd_list_tr);
- tr->tr_num_buf--;
- }
- gfs2_log_unlock(sdp);
- gfs2_assert_warn(sdp, !tr->tr_num_buf);
-}
-
/**
* gfs2_log_commit - Commit a transaction to the log
* @sdp: the filesystem
@@ -729,8 +714,6 @@ static void buf_lo_incore_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
{
log_refund(sdp, tr);
- buf_lo_incore_commit(sdp, tr);
-
up_read(&sdp->sd_log_flush_lock);

if (atomic_read(&sdp->sd_log_pinned) > atomic_read(&sdp->sd_log_thresh1) ||
diff --git a/fs/gfs2/lops.c b/fs/gfs2/lops.c
index 7882671..e9709da 100644
--- a/fs/gfs2/lops.c
+++ b/fs/gfs2/lops.c
@@ -396,12 +396,8 @@ static void buf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)

lock_buffer(bd->bd_bh);
gfs2_log_lock(sdp);
- if (!list_empty(&bd->bd_list_tr))
- goto out;
tr = current->journal_info;
tr->tr_touched = 1;
- tr->tr_num_buf++;
- list_add(&bd->bd_list_tr, &tr->tr_list_buf);
if (!list_empty(&le->le_list))
goto out;
set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
@@ -781,18 +777,10 @@ static void databuf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)

lock_buffer(bd->bd_bh);
gfs2_log_lock(sdp);
- if (tr) {
- if (!list_empty(&bd->bd_list_tr))
- goto out;
+ if (tr)
tr->tr_touched = 1;
- if (gfs2_is_jdata(ip)) {
- tr->tr_num_buf++;
- list_add(&bd->bd_list_tr, &tr->tr_list_buf);
- }
- }
if (!list_empty(&le->le_list))
goto out;
-
set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
if (gfs2_is_jdata(ip)) {
diff --git a/fs/gfs2/meta_io.c b/fs/gfs2/meta_io.c
index 181586e..8a82a4d 100644
--- a/fs/gfs2/meta_io.c
+++ b/fs/gfs2/meta_io.c
@@ -293,7 +293,6 @@ void gfs2_attach_bufdata(struct gfs2_glock *gl, struct buffer_head *bh,
bd->bd_bh = bh;
bd->bd_gl = gl;

- INIT_LIST_HEAD(&bd->bd_list_tr);
if (meta)
lops_init_le(&bd->bd_le, &gfs2_buf_lops);
else
diff --git a/fs/gfs2/trans.c b/fs/gfs2/trans.c
index 86ac75d..8fb6317 100644
--- a/fs/gfs2/trans.c
+++ b/fs/gfs2/trans.c
@@ -50,8 +50,6 @@ int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks,
if (revokes)
tr->tr_reserved += gfs2_struct2blk(sdp, revokes,
sizeof(u64));
- INIT_LIST_HEAD(&tr->tr_list_buf);
-
gfs2_holder_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &tr->tr_t_gh);

error = gfs2_glock_nq(&tr->tr_t_gh);
@@ -93,10 +91,21 @@ static void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks)
up_read(&sdp->sd_log_flush_lock);
}

+static void gfs2_print_trans(const struct gfs2_trans *tr)
+{
+ print_symbol(KERN_WARNING "GFS2: Transaction created at: %s
", tr->tr_ip);
+ printk(KERN_WARNING "GFS2: blocks=%u revokes=%u reserved=%u touched=%d
",
+ tr->tr_blocks, tr->tr_revokes, tr->tr_reserved, tr->tr_touched);
+ printk(KERN_WARNING "GFS2: Buf %u/%u Databuf %u/%u Revoke %u/%u
",
+ tr->tr_num_buf_new, tr->tr_num_buf_rm,
+ tr->tr_num_databuf_new, tr->tr_num_databuf_rm,
+ tr->tr_num_revoke, tr->tr_num_revoke_rm);
+}
+
void gfs2_trans_end(struct gfs2_sbd *sdp)
{
struct gfs2_trans *tr = current->journal_info;
-
+ s64 nbuf;
BUG_ON(!tr);
current->journal_info = NULL;

@@ -110,16 +119,13 @@ void gfs2_trans_end(struct gfs2_sbd *sdp)
return;
}

- if (gfs2_assert_withdraw(sdp, tr->tr_num_buf <= tr->tr_blocks)) {
- fs_err(sdp, "tr_num_buf = %u, tr_blocks = %u ",
- tr->tr_num_buf, tr->tr_blocks);
- print_symbol(KERN_WARNING "GFS2: Transaction created at: %s
", tr->tr_ip);
- }
- if (gfs2_assert_withdraw(sdp, tr->tr_num_revoke <= tr->tr_revokes)) {
- fs_err(sdp, "tr_num_revoke = %u, tr_revokes = %u ",
- tr->tr_num_revoke, tr->tr_revokes);
- print_symbol(KERN_WARNING "GFS2: Transaction created at: %s
", tr->tr_ip);
- }
+ nbuf = tr->tr_num_buf_new + tr->tr_num_databuf_new;
+ nbuf -= tr->tr_num_buf_rm;
+ nbuf -= tr->tr_num_databuf_rm;
+
+ if (gfs2_assert_withdraw(sdp, (nbuf <= tr->tr_blocks) &&
+ (tr->tr_num_revoke <= tr->tr_revokes)))
+ gfs2_print_trans(tr);

gfs2_log_commit(sdp, tr);
if (tr->tr_t_gh.gh_gl) {
--
1.7.4
 

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