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GFS2: Remove bd_list_tr

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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>
This commit is contained in:
Steven Whitehouse 2012-04-16 16:40:56 +01:00
parent dad30e9031
commit c50b91c4bd
7 changed files with 21 additions and 56 deletions
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1
fs/gfs2/aops.c
View File

@ -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);

1
fs/gfs2/glops.c
View File

@ -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;

11
fs/gfs2/incore.h
View File

@ -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;
};

17
fs/gfs2/log.c
View File

@ -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) ||

14
fs/gfs2/lops.c
View File

@ -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)) {

1
fs/gfs2/meta_io.c
View File

@ -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

32
fs/gfs2/trans.c
View File

@ -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\n", tr->tr_ip);
printk(KERN_WARNING "GFS2: blocks=%u revokes=%u reserved=%u touched=%d\n",
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\n",
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\n", 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\n", 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) {