return blks;
}
+/**
+ * gfs2_remove_from_ail - Remove an entry from the ail lists, updating counters
+ * @mapping: The associated mapping (maybe NULL)
+ * @bd: The gfs2_bufdata to remove
+ *
+ * The log lock _must_ be held when calling this function
+ *
+ */
+
+void gfs2_remove_from_ail(struct address_space *mapping, struct gfs2_bufdata *bd)
+{
+ bd->bd_ail = NULL;
+ list_del_init(&bd->bd_ail_st_list);
+ list_del_init(&bd->bd_ail_gl_list);
+ atomic_dec(&bd->bd_gl->gl_ail_count);
+ if (mapping)
+ gfs2_meta_cache_flush(GFS2_I(mapping->host));
+ brelse(bd->bd_bh);
+}
+
/**
* gfs2_ail1_start_one - Start I/O on a part of the AIL
* @sdp: the filesystem
gfs2_assert(sdp, bd->bd_ail == ai);
if (!buffer_busy(bh)) {
- if (!buffer_uptodate(bh)) {
- gfs2_log_unlock(sdp);
+ if (!buffer_uptodate(bh))
gfs2_io_error_bh(sdp, bh);
- gfs2_log_lock(sdp);
- }
list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list);
continue;
}
list_move(&bd->bd_ail_st_list, &ai->ai_ail1_list);
+ get_bh(bh);
gfs2_log_unlock(sdp);
- wait_on_buffer(bh);
- ll_rw_block(WRITE, 1, &bh);
+ lock_buffer(bh);
+ if (test_clear_buffer_dirty(bh)) {
+ bh->b_end_io = end_buffer_write_sync;
+ submit_bh(WRITE, bh);
+ } else {
+ unlock_buffer(bh);
+ brelse(bh);
+ }
gfs2_log_lock(sdp);
retry = 1;
static void gfs2_ail1_start(struct gfs2_sbd *sdp, int flags)
{
- struct list_head *head = &sdp->sd_ail1_list;
+ struct list_head *head;
u64 sync_gen;
struct list_head *first;
struct gfs2_ail *first_ai, *ai, *tmp;
int done = 0;
gfs2_log_lock(sdp);
+ head = &sdp->sd_ail1_list;
if (list_empty(head)) {
gfs2_log_unlock(sdp);
return;
bd = list_entry(head->prev, struct gfs2_bufdata,
bd_ail_st_list);
gfs2_assert(sdp, bd->bd_ail == ai);
- bd->bd_ail = NULL;
- list_del(&bd->bd_ail_st_list);
- list_del(&bd->bd_ail_gl_list);
- atomic_dec(&bd->bd_gl->gl_ail_count);
- brelse(bd->bd_bh);
+ gfs2_remove_from_ail(bd->bd_bh->b_page->mapping, bd);
}
}
* @sdp: The GFS2 superblock
* @blks: The number of blocks to reserve
*
- * Note that we never give out the last 6 blocks of the journal. Thats
- * due to the fact that there is are a small number of header blocks
+ * Note that we never give out the last few blocks of the journal. Thats
+ * due to the fact that there is a small number of header blocks
* associated with each log flush. The exact number can't be known until
* flush time, so we ensure that we have just enough free blocks at all
* times to avoid running out during a log flush.
int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks)
{
unsigned int try = 0;
+ unsigned reserved_blks = 6 * (4096 / sdp->sd_vfs->s_blocksize);
if (gfs2_assert_warn(sdp, blks) ||
gfs2_assert_warn(sdp, blks <= sdp->sd_jdesc->jd_blocks))
mutex_lock(&sdp->sd_log_reserve_mutex);
gfs2_log_lock(sdp);
- while(sdp->sd_log_blks_free <= (blks + 6)) {
+ while(sdp->sd_log_blks_free <= (blks + reserved_blks)) {
gfs2_log_unlock(sdp);
gfs2_ail1_empty(sdp, 0);
gfs2_log_flush(sdp, NULL);
return dist;
}
+/**
+ * calc_reserved - Calculate the number of blocks to reserve when
+ * refunding a transaction's unused buffers.
+ * @sdp: The GFS2 superblock
+ *
+ * This is complex. We need to reserve room for all our currently used
+ * metadata buffers (e.g. normal file I/O rewriting file time stamps) and
+ * all our journaled data buffers for journaled files (e.g. files in the
+ * meta_fs like rindex, or files for which chattr +j was done.)
+ * If we don't reserve enough space, gfs2_log_refund and gfs2_log_flush
+ * will count it as free space (sd_log_blks_free) and corruption will follow.
+ *
+ * We can have metadata bufs and jdata bufs in the same journal. So each
+ * type gets its own log header, for which we need to reserve a block.
+ * In fact, each type has the potential for needing more than one header
+ * in cases where we have more buffers than will fit on a journal page.
+ * Metadata journal entries take up half the space of journaled buffer entries.
+ * Thus, metadata entries have buf_limit (502) and journaled buffers have
+ * databuf_limit (251) before they cause a wrap around.
+ *
+ * Also, we need to reserve blocks for revoke journal entries and one for an
+ * overall header for the lot.
+ *
+ * Returns: the number of blocks reserved
+ */
+static unsigned int calc_reserved(struct gfs2_sbd *sdp)
+{
+ unsigned int reserved = 0;
+ unsigned int mbuf_limit, metabufhdrs_needed;
+ unsigned int dbuf_limit, databufhdrs_needed;
+ unsigned int revokes = 0;
+
+ mbuf_limit = buf_limit(sdp);
+ metabufhdrs_needed = (sdp->sd_log_commited_buf +
+ (mbuf_limit - 1)) / mbuf_limit;
+ dbuf_limit = databuf_limit(sdp);
+ databufhdrs_needed = (sdp->sd_log_commited_databuf +
+ (dbuf_limit - 1)) / dbuf_limit;
+
+ if (sdp->sd_log_commited_revoke)
+ revokes = gfs2_struct2blk(sdp, sdp->sd_log_commited_revoke,
+ sizeof(u64));
+
+ reserved = sdp->sd_log_commited_buf + metabufhdrs_needed +
+ sdp->sd_log_commited_databuf + databufhdrs_needed +
+ revokes;
+ /* One for the overall header */
+ if (reserved)
+ reserved++;
+ return reserved;
+}
+
static unsigned int current_tail(struct gfs2_sbd *sdp)
{
struct gfs2_ail *ai;
return tail;
}
-static inline void log_incr_head(struct gfs2_sbd *sdp)
+void gfs2_log_incr_head(struct gfs2_sbd *sdp)
{
if (sdp->sd_log_flush_head == sdp->sd_log_tail)
- gfs2_assert_withdraw(sdp, sdp->sd_log_flush_head == sdp->sd_log_head);
+ BUG_ON(sdp->sd_log_flush_head != sdp->sd_log_head);
if (++sdp->sd_log_flush_head == sdp->sd_jdesc->jd_blocks) {
sdp->sd_log_flush_head = 0;
}
}
+/**
+ * gfs2_log_write_endio - End of I/O for a log buffer
+ * @bh: The buffer head
+ * @uptodate: I/O Status
+ *
+ */
+
+static void gfs2_log_write_endio(struct buffer_head *bh, int uptodate)
+{
+ struct gfs2_sbd *sdp = bh->b_private;
+ bh->b_private = NULL;
+
+ end_buffer_write_sync(bh, uptodate);
+ if (atomic_dec_and_test(&sdp->sd_log_in_flight))
+ wake_up(&sdp->sd_log_flush_wait);
+}
+
/**
* gfs2_log_get_buf - Get and initialize a buffer to use for log control data
* @sdp: The GFS2 superblock
struct buffer_head *gfs2_log_get_buf(struct gfs2_sbd *sdp)
{
u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head);
- struct gfs2_log_buf *lb;
struct buffer_head *bh;
- lb = kzalloc(sizeof(struct gfs2_log_buf), GFP_NOFS | __GFP_NOFAIL);
- list_add(&lb->lb_list, &sdp->sd_log_flush_list);
-
- bh = lb->lb_bh = sb_getblk(sdp->sd_vfs, blkno);
+ bh = sb_getblk(sdp->sd_vfs, blkno);
lock_buffer(bh);
memset(bh->b_data, 0, bh->b_size);
set_buffer_uptodate(bh);
clear_buffer_dirty(bh);
- unlock_buffer(bh);
-
- log_incr_head(sdp);
+ gfs2_log_incr_head(sdp);
+ atomic_inc(&sdp->sd_log_in_flight);
+ bh->b_private = sdp;
+ bh->b_end_io = gfs2_log_write_endio;
return bh;
}
+/**
+ * gfs2_fake_write_endio -
+ * @bh: The buffer head
+ * @uptodate: The I/O Status
+ *
+ */
+
+static void gfs2_fake_write_endio(struct buffer_head *bh, int uptodate)
+{
+ struct buffer_head *real_bh = bh->b_private;
+ struct gfs2_bufdata *bd = real_bh->b_private;
+ struct gfs2_sbd *sdp = bd->bd_gl->gl_sbd;
+
+ end_buffer_write_sync(bh, uptodate);
+ free_buffer_head(bh);
+ unlock_buffer(real_bh);
+ brelse(real_bh);
+ if (atomic_dec_and_test(&sdp->sd_log_in_flight))
+ wake_up(&sdp->sd_log_flush_wait);
+}
+
/**
* gfs2_log_fake_buf - Build a fake buffer head to write metadata buffer to log
* @sdp: the filesystem
struct buffer_head *real)
{
u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head);
- struct gfs2_log_buf *lb;
struct buffer_head *bh;
- lb = kzalloc(sizeof(struct gfs2_log_buf), GFP_NOFS | __GFP_NOFAIL);
- list_add(&lb->lb_list, &sdp->sd_log_flush_list);
- lb->lb_real = real;
-
- bh = lb->lb_bh = alloc_buffer_head(GFP_NOFS | __GFP_NOFAIL);
+ bh = alloc_buffer_head(GFP_NOFS | __GFP_NOFAIL);
atomic_set(&bh->b_count, 1);
- bh->b_state = (1 << BH_Mapped) | (1 << BH_Uptodate);
+ bh->b_state = (1 << BH_Mapped) | (1 << BH_Uptodate) | (1 << BH_Lock);
set_bh_page(bh, real->b_page, bh_offset(real));
bh->b_blocknr = blkno;
bh->b_size = sdp->sd_sb.sb_bsize;
bh->b_bdev = sdp->sd_vfs->s_bdev;
+ bh->b_private = real;
+ bh->b_end_io = gfs2_fake_write_endio;
- log_incr_head(sdp);
+ gfs2_log_incr_head(sdp);
+ atomic_inc(&sdp->sd_log_in_flight);
return bh;
}
-static void log_pull_tail(struct gfs2_sbd *sdp, unsigned int new_tail, int pull)
+static void log_pull_tail(struct gfs2_sbd *sdp, unsigned int new_tail)
{
unsigned int dist = log_distance(sdp, new_tail, sdp->sd_log_tail);
ail2_empty(sdp, new_tail);
gfs2_log_lock(sdp);
- sdp->sd_log_blks_free += dist - (pull ? 1 : 0);
+ sdp->sd_log_blks_free += dist;
gfs2_assert_withdraw(sdp, sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks);
gfs2_log_unlock(sdp);
brelse(bh);
if (sdp->sd_log_tail != tail)
- log_pull_tail(sdp, tail, pull);
+ log_pull_tail(sdp, tail);
else
gfs2_assert_withdraw(sdp, !pull);
sdp->sd_log_idle = (tail == sdp->sd_log_flush_head);
- log_incr_head(sdp);
+ gfs2_log_incr_head(sdp);
}
static void log_flush_commit(struct gfs2_sbd *sdp)
{
- struct list_head *head = &sdp->sd_log_flush_list;
- struct gfs2_log_buf *lb;
- struct buffer_head *bh;
+ DEFINE_WAIT(wait);
+
+ if (atomic_read(&sdp->sd_log_in_flight)) {
+ do {
+ prepare_to_wait(&sdp->sd_log_flush_wait, &wait,
+ TASK_UNINTERRUPTIBLE);
+ if (atomic_read(&sdp->sd_log_in_flight))
+ io_schedule();
+ } while(atomic_read(&sdp->sd_log_in_flight));
+ finish_wait(&sdp->sd_log_flush_wait, &wait);
+ }
- while (!list_empty(head)) {
- lb = list_entry(head->next, struct gfs2_log_buf, lb_list);
- list_del(&lb->lb_list);
- bh = lb->lb_bh;
+ log_write_header(sdp, 0, 0);
+}
- wait_on_buffer(bh);
- if (!buffer_uptodate(bh))
- gfs2_io_error_bh(sdp, bh);
- if (lb->lb_real) {
- while (atomic_read(&bh->b_count) != 1) /* Grrrr... */
- schedule();
- free_buffer_head(bh);
- } else
+static void gfs2_ordered_write(struct gfs2_sbd *sdp)
+{
+ struct gfs2_bufdata *bd;
+ struct buffer_head *bh;
+ LIST_HEAD(written);
+
+ gfs2_log_lock(sdp);
+ 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);
+ bh = bd->bd_bh;
+ if (!buffer_dirty(bh))
+ continue;
+ get_bh(bh);
+ gfs2_log_unlock(sdp);
+ lock_buffer(bh);
+ if (test_clear_buffer_dirty(bh)) {
+ bh->b_end_io = end_buffer_write_sync;
+ submit_bh(WRITE, bh);
+ } else {
+ unlock_buffer(bh);
brelse(bh);
- kfree(lb);
+ }
+ gfs2_log_lock(sdp);
}
+ list_splice(&written, &sdp->sd_log_le_ordered);
+ gfs2_log_unlock(sdp);
+}
- log_write_header(sdp, 0, 0);
+static void gfs2_ordered_wait(struct gfs2_sbd *sdp)
+{
+ struct gfs2_bufdata *bd;
+ struct buffer_head *bh;
+
+ 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);
+ bh = bd->bd_bh;
+ if (buffer_locked(bh)) {
+ get_bh(bh);
+ gfs2_log_unlock(sdp);
+ wait_on_buffer(bh);
+ brelse(bh);
+ gfs2_log_lock(sdp);
+ continue;
+ }
+ list_del_init(&bd->bd_le.le_list);
+ }
+ gfs2_log_unlock(sdp);
}
/**
INIT_LIST_HEAD(&ai->ai_ail1_list);
INIT_LIST_HEAD(&ai->ai_ail2_list);
- gfs2_assert_withdraw(sdp, sdp->sd_log_num_buf == sdp->sd_log_commited_buf);
+ if (sdp->sd_log_num_buf != sdp->sd_log_commited_buf) {
+ printk(KERN_INFO "GFS2: log buf %u %u\n", sdp->sd_log_num_buf,
+ sdp->sd_log_commited_buf);
+ gfs2_assert_withdraw(sdp, 0);
+ }
+ if (sdp->sd_log_num_databuf != sdp->sd_log_commited_databuf) {
+ printk(KERN_INFO "GFS2: log databuf %u %u\n",
+ sdp->sd_log_num_databuf, sdp->sd_log_commited_databuf);
+ gfs2_assert_withdraw(sdp, 0);
+ }
gfs2_assert_withdraw(sdp,
sdp->sd_log_num_revoke == sdp->sd_log_commited_revoke);
sdp->sd_log_flush_wrapped = 0;
ai->ai_first = sdp->sd_log_flush_head;
+ gfs2_ordered_write(sdp);
lops_before_commit(sdp);
- if (!list_empty(&sdp->sd_log_flush_list))
+ gfs2_ordered_wait(sdp);
+
+ if (sdp->sd_log_head != sdp->sd_log_flush_head)
log_flush_commit(sdp);
- else if (sdp->sd_log_tail != current_tail(sdp) && !sdp->sd_log_idle)
+ else if (sdp->sd_log_tail != current_tail(sdp) && !sdp->sd_log_idle){
+ gfs2_log_lock(sdp);
+ sdp->sd_log_blks_free--; /* Adjust for unreserved buffer */
+ gfs2_log_unlock(sdp);
log_write_header(sdp, 0, PULL);
+ }
lops_after_commit(sdp, ai);
gfs2_log_lock(sdp);
sdp->sd_log_head = sdp->sd_log_flush_head;
- sdp->sd_log_blks_free -= sdp->sd_log_num_hdrs;
sdp->sd_log_blks_reserved = 0;
sdp->sd_log_commited_buf = 0;
- sdp->sd_log_num_hdrs = 0;
+ sdp->sd_log_commited_databuf = 0;
sdp->sd_log_commited_revoke = 0;
if (!list_empty(&ai->ai_ail1_list)) {
static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
{
- unsigned int reserved = 0;
+ unsigned int reserved;
unsigned int old;
gfs2_log_lock(sdp);
sdp->sd_log_commited_buf += tr->tr_num_buf_new - tr->tr_num_buf_rm;
- gfs2_assert_withdraw(sdp, ((int)sdp->sd_log_commited_buf) >= 0);
+ sdp->sd_log_commited_databuf += tr->tr_num_databuf_new -
+ tr->tr_num_databuf_rm;
+ gfs2_assert_withdraw(sdp, (((int)sdp->sd_log_commited_buf) >= 0) ||
+ (((int)sdp->sd_log_commited_databuf) >= 0));
sdp->sd_log_commited_revoke += tr->tr_num_revoke - tr->tr_num_revoke_rm;
gfs2_assert_withdraw(sdp, ((int)sdp->sd_log_commited_revoke) >= 0);
-
- if (sdp->sd_log_commited_buf)
- reserved += sdp->sd_log_commited_buf;
- if (sdp->sd_log_commited_revoke)
- reserved += gfs2_struct2blk(sdp, sdp->sd_log_commited_revoke,
- sizeof(u64));
- if (reserved)
- reserved++;
-
+ reserved = calc_reserved(sdp);
old = sdp->sd_log_blks_free;
sdp->sd_log_blks_free += tr->tr_reserved -
(reserved - sdp->sd_log_blks_reserved);
gfs2_assert_withdraw(sdp, sdp->sd_log_blks_free >= old);
- gfs2_assert_withdraw(sdp,
- sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks +
- sdp->sd_log_num_hdrs);
+ gfs2_assert_withdraw(sdp, sdp->sd_log_blks_free <=
+ sdp->sd_jdesc->jd_blocks);
sdp->sd_log_blks_reserved = reserved;
gfs2_assert_withdraw(sdp, !sdp->sd_log_blks_reserved);
gfs2_assert_withdraw(sdp, !sdp->sd_log_num_gl);
gfs2_assert_withdraw(sdp, !sdp->sd_log_num_buf);
- gfs2_assert_withdraw(sdp, !sdp->sd_log_num_jdata);
gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
gfs2_assert_withdraw(sdp, !sdp->sd_log_num_rg);
gfs2_assert_withdraw(sdp, !sdp->sd_log_num_databuf);
- gfs2_assert_withdraw(sdp, !sdp->sd_log_num_hdrs);
gfs2_assert_withdraw(sdp, list_empty(&sdp->sd_ail1_list));
sdp->sd_log_flush_head = sdp->sd_log_head;
sdp->sd_log_flush_wrapped = 0;
- log_write_header(sdp, GFS2_LOG_HEAD_UNMOUNT, 0);
+ log_write_header(sdp, GFS2_LOG_HEAD_UNMOUNT,
+ (sdp->sd_log_tail == current_tail(sdp)) ? 0 : PULL);
gfs2_assert_warn(sdp, sdp->sd_log_blks_free == sdp->sd_jdesc->jd_blocks);
gfs2_assert_warn(sdp, sdp->sd_log_head == sdp->sd_log_tail);
projects / linux-2.6-omap-h63xx.git / blobdiff