#include "trans.h"
#include "util.h"
-static void glock_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
+/**
+ * gfs2_pin - Pin a buffer in memory
+ * @sdp: The superblock
+ * @bh: The buffer to be pinned
+ *
+ * The log lock must be held when calling this function
+ */
+static void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh)
+{
+ struct gfs2_bufdata *bd;
+
+ gfs2_assert_withdraw(sdp, test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags));
+
+ clear_buffer_dirty(bh);
+ if (test_set_buffer_pinned(bh))
+ gfs2_assert_withdraw(sdp, 0);
+ if (!buffer_uptodate(bh))
+ gfs2_io_error_bh(sdp, bh);
+ bd = bh->b_private;
+ /* If this buffer is in the AIL and it has already been written
+ * to in-place disk block, remove it from the AIL.
+ */
+ if (bd->bd_ail)
+ list_move(&bd->bd_ail_st_list, &bd->bd_ail->ai_ail2_list);
+ get_bh(bh);
+}
+
+/**
+ * gfs2_unpin - Unpin a buffer
+ * @sdp: the filesystem the buffer belongs to
+ * @bh: The buffer to unpin
+ * @ai:
+ *
+ */
+
+static void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh,
+ struct gfs2_ail *ai)
+{
+ struct gfs2_bufdata *bd = bh->b_private;
+
+ gfs2_assert_withdraw(sdp, buffer_uptodate(bh));
+
+ if (!buffer_pinned(bh))
+ gfs2_assert_withdraw(sdp, 0);
+
+ lock_buffer(bh);
+ mark_buffer_dirty(bh);
+ clear_buffer_pinned(bh);
+
+ gfs2_log_lock(sdp);
+ if (bd->bd_ail) {
+ list_del(&bd->bd_ail_st_list);
+ brelse(bh);
+ } else {
+ struct gfs2_glock *gl = bd->bd_gl;
+ list_add(&bd->bd_ail_gl_list, &gl->gl_ail_list);
+ atomic_inc(&gl->gl_ail_count);
+ }
+ bd->bd_ail = ai;
+ list_add(&bd->bd_ail_st_list, &ai->ai_ail1_list);
+ gfs2_log_unlock(sdp);
+ unlock_buffer(bh);
+}
+
+static void __glock_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
{
struct gfs2_glock *gl;
struct gfs2_trans *tr = current->journal_info;
if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(gl)))
return;
- gfs2_log_lock(sdp);
- if (!list_empty(&le->le_list)){
- gfs2_log_unlock(sdp);
+ if (!list_empty(&le->le_list))
return;
- }
+
gfs2_glock_hold(gl);
set_bit(GLF_DIRTY, &gl->gl_flags);
sdp->sd_log_num_gl++;
list_add(&le->le_list, &sdp->sd_log_le_gl);
+}
+
+static void glock_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
+{
+ gfs2_log_lock(sdp);
+ __glock_lo_add(sdp, le);
gfs2_log_unlock(sdp);
}
struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
struct gfs2_trans *tr;
+ lock_buffer(bd->bd_bh);
gfs2_log_lock(sdp);
- if (!list_empty(&bd->bd_list_tr)) {
- gfs2_log_unlock(sdp);
- return;
- }
+ 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);
- gfs2_log_unlock(sdp);
-
if (!list_empty(&le->le_list))
- return;
-
- gfs2_trans_add_gl(bd->bd_gl);
-
+ goto out;
+ __glock_lo_add(sdp, &bd->bd_gl->gl_le);
gfs2_meta_check(sdp, bd->bd_bh);
gfs2_pin(sdp, bd->bd_bh);
- gfs2_log_lock(sdp);
sdp->sd_log_num_buf++;
list_add(&le->le_list, &sdp->sd_log_le_buf);
- gfs2_log_unlock(sdp);
-
tr->tr_num_buf_new++;
+out:
+ gfs2_log_unlock(sdp);
+ unlock_buffer(bd->bd_bh);
}
static void buf_lo_incore_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
struct buffer_head *bh;
struct gfs2_log_descriptor *ld;
struct gfs2_bufdata *bd1 = NULL, *bd2;
- unsigned int total = sdp->sd_log_num_buf;
+ unsigned int total;
unsigned int offset = BUF_OFFSET;
unsigned int limit;
unsigned int num;
limit = buf_limit(sdp);
/* for 4k blocks, limit = 503 */
+ gfs2_log_lock(sdp);
+ total = sdp->sd_log_num_buf;
bd1 = bd2 = list_prepare_entry(bd1, &sdp->sd_log_le_buf, bd_le.le_list);
while(total) {
num = total;
if (total > limit)
num = limit;
+ gfs2_log_unlock(sdp);
bh = gfs2_log_get_buf(sdp);
+ gfs2_log_lock(sdp);
ld = (struct gfs2_log_descriptor *)bh->b_data;
ptr = (__be64 *)(bh->b_data + offset);
ld->ld_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
break;
}
+ gfs2_log_unlock(sdp);
set_buffer_dirty(bh);
ll_rw_block(WRITE, 1, &bh);
+ gfs2_log_lock(sdp);
n = 0;
list_for_each_entry_continue(bd2, &sdp->sd_log_le_buf,
bd_le.le_list) {
+ gfs2_log_unlock(sdp);
bh = gfs2_log_fake_buf(sdp, bd2->bd_bh);
set_buffer_dirty(bh);
ll_rw_block(WRITE, 1, &bh);
+ gfs2_log_lock(sdp);
if (++n >= num)
break;
}
+ BUG_ON(total < num);
total -= num;
}
+ gfs2_log_unlock(sdp);
}
static void buf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
struct buffer_head *bh;
unsigned int offset;
struct list_head *head = &sdp->sd_log_le_revoke;
- struct gfs2_revoke *rv;
+ struct gfs2_bufdata *bd;
if (!sdp->sd_log_num_revoke)
return;
offset = sizeof(struct gfs2_log_descriptor);
while (!list_empty(head)) {
- rv = list_entry(head->next, struct gfs2_revoke, rv_le.le_list);
- list_del_init(&rv->rv_le.le_list);
+ bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
+ list_del_init(&bd->bd_le.le_list);
sdp->sd_log_num_revoke--;
if (offset + sizeof(u64) > sdp->sd_sb.sb_bsize) {
offset = sizeof(struct gfs2_meta_header);
}
- *(__be64 *)(bh->b_data + offset) = cpu_to_be64(rv->rv_blkno);
- kfree(rv);
+ *(__be64 *)(bh->b_data + offset) = cpu_to_be64(bd->bd_blkno);
+ kfree(bd);
offset += sizeof(u64);
}
struct address_space *mapping = bd->bd_bh->b_page->mapping;
struct gfs2_inode *ip = GFS2_I(mapping->host);
+ lock_buffer(bd->bd_bh);
gfs2_log_lock(sdp);
- if (!list_empty(&bd->bd_list_tr)) {
- gfs2_log_unlock(sdp);
- return;
- }
+ if (!list_empty(&bd->bd_list_tr))
+ goto out;
tr->tr_touched = 1;
if (gfs2_is_jdata(ip)) {
tr->tr_num_buf++;
list_add(&bd->bd_list_tr, &tr->tr_list_buf);
}
- gfs2_log_unlock(sdp);
if (!list_empty(&le->le_list))
- return;
+ goto out;
- gfs2_trans_add_gl(bd->bd_gl);
+ __glock_lo_add(sdp, &bd->bd_gl->gl_le);
if (gfs2_is_jdata(ip)) {
- sdp->sd_log_num_jdata++;
gfs2_pin(sdp, bd->bd_bh);
tr->tr_num_databuf_new++;
+ sdp->sd_log_num_databuf++;
+ list_add(&le->le_list, &sdp->sd_log_le_databuf);
+ } else {
+ list_add(&le->le_list, &sdp->sd_log_le_ordered);
}
- gfs2_log_lock(sdp);
- sdp->sd_log_num_databuf++;
- list_add(&le->le_list, &sdp->sd_log_le_databuf);
+out:
gfs2_log_unlock(sdp);
+ unlock_buffer(bd->bd_bh);
}
static int gfs2_check_magic(struct buffer_head *bh)
/**
* databuf_lo_before_commit - Scan the data buffers, writing as we go
*
- * Here we scan through the lists of buffers and make the assumption
- * that any buffer thats been pinned is being journaled, and that
- * any unpinned buffer is an ordered write data buffer and therefore
- * will be written back rather than journaled.
*/
+
static void databuf_lo_before_commit(struct gfs2_sbd *sdp)
{
- LIST_HEAD(started);
- struct gfs2_bufdata *bd1 = NULL, *bd2, *bdt;
+ struct gfs2_bufdata *bd1 = NULL, *bd2;
struct buffer_head *bh = NULL,*bh1 = NULL;
struct gfs2_log_descriptor *ld;
unsigned int limit;
- unsigned int total_dbuf;
- unsigned int total_jdata = sdp->sd_log_num_jdata;
+ unsigned int total;
unsigned int num, n;
__be64 *ptr = NULL;
+ int magic;
+
limit = databuf_limit(sdp);
- /*
- * Start writing ordered buffers, write journaled buffers
- * into the log along with a header
- */
gfs2_log_lock(sdp);
- total_dbuf = sdp->sd_log_num_databuf;
+ total = sdp->sd_log_num_databuf;
bd2 = bd1 = list_prepare_entry(bd1, &sdp->sd_log_le_databuf,
bd_le.le_list);
- while(total_dbuf) {
- num = total_jdata;
+ while(total) {
+ num = total;
if (num > limit)
num = limit;
+
+ gfs2_log_unlock(sdp);
+ bh = gfs2_log_get_buf(sdp);
+ gfs2_log_lock(sdp);
+
+ ld = (struct gfs2_log_descriptor *)bh->b_data;
+ ptr = (__be64 *)(bh->b_data + DATABUF_OFFSET);
+ ld->ld_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
+ ld->ld_header.mh_type = cpu_to_be32(GFS2_METATYPE_LD);
+ ld->ld_header.mh_format = cpu_to_be32(GFS2_FORMAT_LD);
+ ld->ld_type = cpu_to_be32(GFS2_LOG_DESC_JDATA);
+ ld->ld_length = cpu_to_be32(num + 1);
+ ld->ld_data1 = cpu_to_be32(num);
+ ld->ld_data2 = cpu_to_be32(0);
+ memset(ld->ld_reserved, 0, sizeof(ld->ld_reserved));
+
n = 0;
- list_for_each_entry_safe_continue(bd1, bdt,
- &sdp->sd_log_le_databuf,
- bd_le.le_list) {
- /* store off the buffer head in a local ptr since
- * gfs2_bufdata might change when we drop the log lock
- */
+ list_for_each_entry_continue(bd1, &sdp->sd_log_le_databuf,
+ bd_le.le_list) {
bh1 = bd1->bd_bh;
- /* An ordered write buffer */
- if (bh1 && !buffer_pinned(bh1)) {
- list_move(&bd1->bd_le.le_list, &started);
- if (bd1 == bd2) {
- bd2 = NULL;
- bd2 = list_prepare_entry(bd2,
- &sdp->sd_log_le_databuf,
- bd_le.le_list);
- }
- total_dbuf--;
- if (bh1) {
- if (buffer_dirty(bh1)) {
- get_bh(bh1);
-
- gfs2_log_unlock(sdp);
-
- ll_rw_block(SWRITE, 1, &bh1);
- brelse(bh1);
-
- gfs2_log_lock(sdp);
- }
- continue;
- }
- continue;
- } else if (bh1) { /* A journaled buffer */
- int magic;
- gfs2_log_unlock(sdp);
- if (!bh) {
- bh = gfs2_log_get_buf(sdp);
- ld = (struct gfs2_log_descriptor *)
- bh->b_data;
- ptr = (__be64 *)(bh->b_data +
- DATABUF_OFFSET);
- ld->ld_header.mh_magic =
- cpu_to_be32(GFS2_MAGIC);
- ld->ld_header.mh_type =
- cpu_to_be32(GFS2_METATYPE_LD);
- ld->ld_header.mh_format =
- cpu_to_be32(GFS2_FORMAT_LD);
- ld->ld_type =
- cpu_to_be32(GFS2_LOG_DESC_JDATA);
- ld->ld_length = cpu_to_be32(num + 1);
- ld->ld_data1 = cpu_to_be32(num);
- ld->ld_data2 = cpu_to_be32(0);
- memset(ld->ld_reserved, 0, sizeof(ld->ld_reserved));
- }
- magic = gfs2_check_magic(bh1);
- *ptr++ = cpu_to_be64(bh1->b_blocknr);
- *ptr++ = cpu_to_be64((__u64)magic);
- clear_buffer_escaped(bh1);
- if (unlikely(magic != 0))
- set_buffer_escaped(bh1);
- gfs2_log_lock(sdp);
- if (++n >= num)
- break;
- } else if (!bh1) {
- total_dbuf--;
- sdp->sd_log_num_databuf--;
- list_del_init(&bd1->bd_le.le_list);
- if (bd1 == bd2) {
- bd2 = NULL;
- bd2 = list_prepare_entry(bd2,
- &sdp->sd_log_le_databuf,
- bd_le.le_list);
- }
- kmem_cache_free(gfs2_bufdata_cachep, bd1);
- }
+ magic = gfs2_check_magic(bh1);
+ *ptr++ = cpu_to_be64(bh1->b_blocknr);
+ *ptr++ = cpu_to_be64((__u64)magic);
+ clear_buffer_escaped(bh1);
+ if (unlikely(magic != 0))
+ set_buffer_escaped(bh1);
+ if (++n >= num)
+ break;
}
gfs2_log_unlock(sdp);
if (bh) {
- set_buffer_mapped(bh);
set_buffer_dirty(bh);
ll_rw_block(WRITE, 1, &bh);
bh = NULL;
+ ptr = NULL;
}
n = 0;
gfs2_log_lock(sdp);
break;
}
bh = NULL;
- BUG_ON(total_dbuf < num);
- total_dbuf -= num;
- total_jdata -= num;
+ BUG_ON(total < num);
+ total -= num;
}
gfs2_log_unlock(sdp);
-
- /* Wait on all ordered buffers */
- while (!list_empty(&started)) {
- gfs2_log_lock(sdp);
- bd1 = list_entry(started.next, struct gfs2_bufdata,
- bd_le.le_list);
- list_del_init(&bd1->bd_le.le_list);
- sdp->sd_log_num_databuf--;
- bh = bd1->bd_bh;
- if (bh) {
- bh->b_private = NULL;
- get_bh(bh);
- gfs2_log_unlock(sdp);
- wait_on_buffer(bh);
- brelse(bh);
- } else
- gfs2_log_unlock(sdp);
-
- kmem_cache_free(gfs2_bufdata_cachep, bd1);
- }
-
- /* We've removed all the ordered write bufs here, so only jdata left */
- gfs2_assert_warn(sdp, sdp->sd_log_num_databuf == sdp->sd_log_num_jdata);
}
static int databuf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
list_del_init(&bd->bd_le.le_list);
sdp->sd_log_num_databuf--;
- sdp->sd_log_num_jdata--;
gfs2_unpin(sdp, bd->bd_bh, ai);
}
gfs2_assert_warn(sdp, !sdp->sd_log_num_databuf);
- gfs2_assert_warn(sdp, !sdp->sd_log_num_jdata);
}
git.openpandora.org / pandora-kernel.git / blobdiff