/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
- * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
- * of the GNU General Public License v.2.
+ * of the GNU General Public License version 2.
*/
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
-#include <asm/semaphore.h>
+#include <linux/gfs2_ondisk.h>
+#include <linux/crc32.h>
+#include <linux/delay.h>
+#include <linux/kthread.h>
+#include <linux/freezer.h>
+#include <linux/bio.h>
#include "gfs2.h"
+#include "incore.h"
#include "bmap.h"
#include "glock.h"
#include "log.h"
#include "lops.h"
#include "meta_io.h"
+#include "util.h"
+#include "dir.h"
+#include "trace_gfs2.h"
#define PULL 1
-static inline int is_done(struct gfs2_sbd *sdp, atomic_t *a)
-{
- int done;
- gfs2_log_lock(sdp);
- done = atomic_read(a) ? 0 : 1;
- gfs2_log_unlock(sdp);
- return done;
-}
-
-static void do_lock_wait(struct gfs2_sbd *sdp, wait_queue_head_t *wq,
- atomic_t *a)
-{
- gfs2_log_unlock(sdp);
- wait_event(*wq, is_done(sdp, a));
- gfs2_log_lock(sdp);
-}
-
-static void lock_for_trans(struct gfs2_sbd *sdp)
-{
- gfs2_log_lock(sdp);
- do_lock_wait(sdp, &sdp->sd_log_trans_wq, &sdp->sd_log_flush_count);
- atomic_inc(&sdp->sd_log_trans_count);
- gfs2_log_unlock(sdp);
-}
-
-static void unlock_from_trans(struct gfs2_sbd *sdp)
-{
- gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_trans_count));
- if (atomic_dec_and_test(&sdp->sd_log_trans_count))
- wake_up(&sdp->sd_log_flush_wq);
-}
-
-void gfs2_lock_for_flush(struct gfs2_sbd *sdp)
-{
- gfs2_log_lock(sdp);
- atomic_inc(&sdp->sd_log_flush_count);
- do_lock_wait(sdp, &sdp->sd_log_flush_wq, &sdp->sd_log_trans_count);
- gfs2_log_unlock(sdp);
-}
-
-void gfs2_unlock_from_flush(struct gfs2_sbd *sdp)
-{
- gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_flush_count));
- if (atomic_dec_and_test(&sdp->sd_log_flush_count))
- wake_up(&sdp->sd_log_trans_wq);
-}
-
/**
* gfs2_struct2blk - compute stuff
* @sdp: the filesystem
first = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_log_descriptor)) / ssize;
if (nstruct > first) {
- second = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header)) / ssize;
- blks += DIV_RU(nstruct - first, second);
+ second = (sdp->sd_sb.sb_bsize -
+ sizeof(struct gfs2_meta_header)) / ssize;
+ blks += DIV_ROUND_UP(nstruct - first, second);
}
return blks;
}
-void gfs2_ail1_start(struct gfs2_sbd *sdp, int flags)
+/**
+ * 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 gfs2_bufdata *bd)
{
- struct list_head *head = &sdp->sd_ail1_list;
- uint64_t sync_gen;
- struct list_head *first, *tmp;
- struct gfs2_ail *first_ai, *ai;
+ 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);
+ brelse(bd->bd_bh);
+}
+
+/**
+ * gfs2_ail1_start_one - Start I/O on a part of the AIL
+ * @sdp: the filesystem
+ * @tr: the part of the AIL
+ *
+ */
+
+static void gfs2_ail1_start_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
+__releases(&sdp->sd_log_lock)
+__acquires(&sdp->sd_log_lock)
+{
+ struct gfs2_bufdata *bd, *s;
+ struct buffer_head *bh;
+ int retry;
+
+ do {
+ retry = 0;
+
+ list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list,
+ bd_ail_st_list) {
+ bh = bd->bd_bh;
+
+ gfs2_assert(sdp, bd->bd_ail == ai);
+
+ if (!buffer_busy(bh)) {
+ if (!buffer_uptodate(bh))
+ gfs2_io_error_bh(sdp, bh);
+ list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list);
+ continue;
+ }
+
+ if (!buffer_dirty(bh))
+ continue;
+
+ list_move(&bd->bd_ail_st_list, &ai->ai_ail1_list);
+
+ 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_SYNC_PLUG, bh);
+ } else {
+ unlock_buffer(bh);
+ brelse(bh);
+ }
+ gfs2_log_lock(sdp);
+
+ retry = 1;
+ break;
+ }
+ } while (retry);
+}
+
+/**
+ * gfs2_ail1_empty_one - Check whether or not a trans in the AIL has been synced
+ * @sdp: the filesystem
+ * @ai: the AIL entry
+ *
+ */
+
+static int gfs2_ail1_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai, int flags)
+{
+ struct gfs2_bufdata *bd, *s;
+ struct buffer_head *bh;
+
+ list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list,
+ bd_ail_st_list) {
+ bh = bd->bd_bh;
+
+ gfs2_assert(sdp, bd->bd_ail == ai);
+
+ if (buffer_busy(bh)) {
+ if (flags & DIO_ALL)
+ continue;
+ else
+ break;
+ }
+
+ if (!buffer_uptodate(bh))
+ gfs2_io_error_bh(sdp, bh);
+
+ list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list);
+ }
+
+ return list_empty(&ai->ai_ail1_list);
+}
+
+static void gfs2_ail1_start(struct gfs2_sbd *sdp, int flags)
+{
+ 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;
first = head->prev;
first_ai = list_entry(first, struct gfs2_ail, ai_list);
first_ai->ai_sync_gen = sync_gen;
- gfs2_ail1_start_one(sdp, first_ai);
+ gfs2_ail1_start_one(sdp, first_ai); /* This may drop log lock */
if (flags & DIO_ALL)
first = NULL;
- for (;;) {
- if (first &&
- (head->prev != first ||
- gfs2_ail1_empty_one(sdp, first_ai, 0)))
+ while(!done) {
+ if (first && (head->prev != first ||
+ gfs2_ail1_empty_one(sdp, first_ai, 0)))
break;
- for (tmp = head->prev; tmp != head; tmp = tmp->prev) {
- ai = list_entry(tmp, struct gfs2_ail, ai_list);
+ done = 1;
+ list_for_each_entry_safe_reverse(ai, tmp, head, ai_list) {
if (ai->ai_sync_gen >= sync_gen)
continue;
ai->ai_sync_gen = sync_gen;
- gfs2_ail1_start_one(sdp, ai);
+ gfs2_ail1_start_one(sdp, ai); /* This may drop log lock */
+ done = 0;
break;
}
-
- if (tmp == head)
- break;
}
gfs2_log_unlock(sdp);
}
-int gfs2_ail1_empty(struct gfs2_sbd *sdp, int flags)
+static int gfs2_ail1_empty(struct gfs2_sbd *sdp, int flags)
{
struct gfs2_ail *ai, *s;
int ret;
return ret;
}
+
+/**
+ * gfs2_ail2_empty_one - Check whether or not a trans in the AIL has been synced
+ * @sdp: the filesystem
+ * @ai: the AIL entry
+ *
+ */
+
+static void gfs2_ail2_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
+{
+ struct list_head *head = &ai->ai_ail2_list;
+ struct gfs2_bufdata *bd;
+
+ while (!list_empty(head)) {
+ bd = list_entry(head->prev, struct gfs2_bufdata,
+ bd_ail_st_list);
+ gfs2_assert(sdp, bd->bd_ail == ai);
+ gfs2_remove_from_ail(bd);
+ }
+}
+
static void ail2_empty(struct gfs2_sbd *sdp, unsigned int new_tail)
{
struct gfs2_ail *ai, *safe;
* @sdp: The GFS2 superblock
* @blks: The number of blocks to reserve
*
+ * 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.
+ *
* Returns: errno
*/
int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks)
{
- LIST_HEAD(list);
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))
return -EINVAL;
- for (;;) {
- gfs2_log_lock(sdp);
-
- if (list_empty(&list)) {
- list_add_tail(&list, &sdp->sd_log_blks_list);
- while (sdp->sd_log_blks_list.next != &list) {
- DECLARE_WAITQUEUE(__wait_chan, current);
- set_current_state(TASK_UNINTERRUPTIBLE);
- add_wait_queue(&sdp->sd_log_blks_wait,
- &__wait_chan);
- gfs2_log_unlock(sdp);
- schedule();
- gfs2_log_lock(sdp);
- remove_wait_queue(&sdp->sd_log_blks_wait,
- &__wait_chan);
- set_current_state(TASK_RUNNING);
- }
- }
-
- /* Never give away the last block so we can
- always pull the tail if we need to. */
- if (sdp->sd_log_blks_free > blks) {
- sdp->sd_log_blks_free -= blks;
- list_del(&list);
- gfs2_log_unlock(sdp);
- wake_up(&sdp->sd_log_blks_wait);
- break;
- }
-
+ mutex_lock(&sdp->sd_log_reserve_mutex);
+ gfs2_log_lock(sdp);
+ while(atomic_read(&sdp->sd_log_blks_free) <= (blks + reserved_blks)) {
gfs2_log_unlock(sdp);
-
gfs2_ail1_empty(sdp, 0);
- gfs2_log_flush(sdp);
+ gfs2_log_flush(sdp, NULL);
if (try++)
gfs2_ail1_start(sdp, 0);
+ gfs2_log_lock(sdp);
}
+ atomic_sub(blks, &sdp->sd_log_blks_free);
+ trace_gfs2_log_blocks(sdp, -blks);
+ gfs2_log_unlock(sdp);
+ mutex_unlock(&sdp->sd_log_reserve_mutex);
- lock_for_trans(sdp);
+ down_read(&sdp->sd_log_flush_lock);
return 0;
}
void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks)
{
- unlock_from_trans(sdp);
gfs2_log_lock(sdp);
- sdp->sd_log_blks_free += blks;
+ atomic_add(blks, &sdp->sd_log_blks_free);
+ trace_gfs2_log_blocks(sdp, blks);
gfs2_assert_withdraw(sdp,
- sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks);
+ atomic_read(&sdp->sd_log_blks_free) <= sdp->sd_jdesc->jd_blocks);
gfs2_log_unlock(sdp);
+ up_read(&sdp->sd_log_flush_lock);
}
-static uint64_t log_bmap(struct gfs2_sbd *sdp, unsigned int lbn)
+static u64 log_bmap(struct gfs2_sbd *sdp, unsigned int lbn)
{
- int new = 0;
- uint64_t dbn;
- int error;
+ struct gfs2_journal_extent *je;
- error = gfs2_block_map(get_v2ip(sdp->sd_jdesc->jd_inode), lbn, &new, &dbn, NULL);
- gfs2_assert_withdraw(sdp, !error && dbn);
+ list_for_each_entry(je, &sdp->sd_jdesc->extent_list, extent_list) {
+ if (lbn >= je->lblock && lbn < je->lblock + je->blocks)
+ return je->dblock + lbn - je->lblock;
+ }
- return dbn;
+ return -1;
}
/**
* Returns: the distance in blocks
*/
-static inline unsigned int log_distance(struct gfs2_sbd *sdp,
- unsigned int newer,
+static inline unsigned int log_distance(struct gfs2_sbd *sdp, unsigned int newer,
unsigned int older)
{
int dist;
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;
gfs2_log_lock(sdp);
- if (list_empty(&sdp->sd_ail1_list))
+ if (list_empty(&sdp->sd_ail1_list)) {
tail = sdp->sd_log_head;
- else {
- ai = list_entry(sdp->sd_ail1_list.prev,
- struct gfs2_ail, ai_list);
+ } else {
+ ai = list_entry(sdp->sd_ail1_list.prev, struct gfs2_ail, ai_list);
tail = ai->ai_first;
}
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)
{
- uint64_t blkno = log_bmap(sdp, sdp->sd_log_flush_head);
- struct gfs2_log_buf *lb;
+ u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head);
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
* @data: the data the buffer_head should point to
struct buffer_head *gfs2_log_fake_buf(struct gfs2_sbd *sdp,
struct buffer_head *real)
{
- uint64_t blkno = log_bmap(sdp, sdp->sd_log_flush_head);
- struct gfs2_log_buf *lb;
+ u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head);
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);
- gfs2_assert_withdraw(sdp,
- sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks);
+ atomic_add(dist, &sdp->sd_log_blks_free);
+ trace_gfs2_log_blocks(sdp, dist);
+ gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <= sdp->sd_jdesc->jd_blocks);
gfs2_log_unlock(sdp);
sdp->sd_log_tail = new_tail;
* Returns: the initialized log buffer descriptor
*/
-static void log_write_header(struct gfs2_sbd *sdp, uint32_t flags, int pull)
+static void log_write_header(struct gfs2_sbd *sdp, u32 flags, int pull)
{
- uint64_t blkno = log_bmap(sdp, sdp->sd_log_flush_head);
+ u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head);
struct buffer_head *bh;
struct gfs2_log_header *lh;
unsigned int tail;
- uint32_t hash;
-
- atomic_inc(&sdp->sd_log_flush_ondisk);
+ u32 hash;
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);
gfs2_ail1_empty(sdp, 0);
tail = current_tail(sdp);
lh = (struct gfs2_log_header *)bh->b_data;
memset(lh, 0, sizeof(struct gfs2_log_header));
lh->lh_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
- lh->lh_header.mh_type = cpu_to_be16(GFS2_METATYPE_LH);
- lh->lh_header.mh_format = cpu_to_be16(GFS2_FORMAT_LH);
- lh->lh_sequence = be64_to_cpu(sdp->sd_log_sequence++);
- lh->lh_flags = be32_to_cpu(flags);
- lh->lh_tail = be32_to_cpu(tail);
- lh->lh_blkno = be32_to_cpu(sdp->sd_log_flush_head);
+ lh->lh_header.mh_type = cpu_to_be32(GFS2_METATYPE_LH);
+ lh->lh_header.__pad0 = cpu_to_be64(0);
+ lh->lh_header.mh_format = cpu_to_be32(GFS2_FORMAT_LH);
+ lh->lh_header.mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid);
+ lh->lh_sequence = cpu_to_be64(sdp->sd_log_sequence++);
+ lh->lh_flags = cpu_to_be32(flags);
+ lh->lh_tail = cpu_to_be32(tail);
+ lh->lh_blkno = cpu_to_be32(sdp->sd_log_flush_head);
hash = gfs2_disk_hash(bh->b_data, sizeof(struct gfs2_log_header));
lh->lh_hash = cpu_to_be32(hash);
- set_buffer_dirty(bh);
- if (sync_dirty_buffer(bh))
+ bh->b_end_io = end_buffer_write_sync;
+ if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
+ goto skip_barrier;
+ get_bh(bh);
+ submit_bh(WRITE_SYNC | (1 << BIO_RW_BARRIER) | (1 << BIO_RW_META), bh);
+ wait_on_buffer(bh);
+ if (buffer_eopnotsupp(bh)) {
+ clear_buffer_eopnotsupp(bh);
+ set_buffer_uptodate(bh);
+ set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
+ lock_buffer(bh);
+skip_barrier:
+ get_bh(bh);
+ submit_bh(WRITE_SYNC | (1 << BIO_RW_META), bh);
+ wait_on_buffer(bh);
+ }
+ if (!buffer_uptodate(bh))
gfs2_io_error_bh(sdp, bh);
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;
- unsigned int d;
-
- d = log_distance(sdp, sdp->sd_log_flush_head, sdp->sd_log_head);
+ 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);
+ }
- gfs2_assert_withdraw(sdp, d + 1 == sdp->sd_log_blks_reserved);
+ log_write_header(sdp, 0, 0);
+}
- while (!list_empty(head)) {
- lb = list_entry(head->next, struct gfs2_log_buf, lb_list);
- list_del(&lb->lb_list);
- bh = lb->lb_bh;
+static void gfs2_ordered_write(struct gfs2_sbd *sdp)
+{
+ struct gfs2_bufdata *bd;
+ struct buffer_head *bh;
+ LIST_HEAD(written);
- 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
+ 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 (buffer_mapped(bh) && test_clear_buffer_dirty(bh)) {
+ bh->b_end_io = end_buffer_write_sync;
+ submit_bh(WRITE_SYNC_PLUG, 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);
}
/**
- * gfs2_log_flush_i - flush incore transaction(s)
+ * gfs2_log_flush - flush incore transaction(s)
* @sdp: the filesystem
* @gl: The glock structure to flush. If NULL, flush the whole incore log
*
*/
-void gfs2_log_flush_i(struct gfs2_sbd *sdp, struct gfs2_glock *gl)
+void __gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl)
{
struct gfs2_ail *ai;
- atomic_inc(&sdp->sd_log_flush_incore);
+ down_write(&sdp->sd_log_flush_lock);
+
+ /* Log might have been flushed while we waited for the flush lock */
+ if (gl && !test_bit(GLF_LFLUSH, &gl->gl_flags)) {
+ up_write(&sdp->sd_log_flush_lock);
+ return;
+ }
+ trace_gfs2_log_flush(sdp, 1);
ai = kzalloc(sizeof(struct gfs2_ail), GFP_NOFS | __GFP_NOFAIL);
INIT_LIST_HEAD(&ai->ai_ail1_list);
INIT_LIST_HEAD(&ai->ai_ail2_list);
- gfs2_lock_for_flush(sdp);
- down(&sdp->sd_log_flush_lock);
-
- 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);
- if (gl && list_empty(&gl->gl_le.le_list)) {
- up(&sdp->sd_log_flush_lock);
- gfs2_unlock_from_flush(sdp);
- kfree(ai);
- return;
- }
-
sdp->sd_log_flush_head = sdp->sd_log_head;
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);
+ atomic_dec(&sdp->sd_log_blks_free); /* Adjust for unreserved buffer */
+ trace_gfs2_log_blocks(sdp, -1);
+ 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;
- if (sdp->sd_log_flush_wrapped)
- sdp->sd_log_wraps++;
+ sdp->sd_log_blks_reserved = 0;
+ sdp->sd_log_commited_buf = 0;
+ sdp->sd_log_commited_databuf = 0;
+ sdp->sd_log_commited_revoke = 0;
- sdp->sd_log_blks_reserved =
- sdp->sd_log_commited_buf =
- sdp->sd_log_commited_revoke = 0;
-
- gfs2_log_lock(sdp);
if (!list_empty(&ai->ai_ail1_list)) {
list_add(&ai->ai_list, &sdp->sd_ail1_list);
ai = NULL;
}
gfs2_log_unlock(sdp);
-
- up(&sdp->sd_log_flush_lock);
- sdp->sd_vfs->s_dirt = 0;
- gfs2_unlock_from_flush(sdp);
+ trace_gfs2_log_flush(sdp, 0);
+ up_write(&sdp->sd_log_flush_lock);
kfree(ai);
}
static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
{
- unsigned int reserved = 1;
- unsigned int old;
+ unsigned int reserved;
+ unsigned int unused;
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);
+ reserved = calc_reserved(sdp);
+ gfs2_assert_withdraw(sdp, sdp->sd_log_blks_reserved + tr->tr_reserved >= reserved);
+ unused = sdp->sd_log_blks_reserved - reserved + tr->tr_reserved;
+ atomic_add(unused, &sdp->sd_log_blks_free);
+ trace_gfs2_log_blocks(sdp, unused);
+ gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <=
+ sdp->sd_jdesc->jd_blocks);
+ sdp->sd_log_blks_reserved = reserved;
- if (sdp->sd_log_commited_buf)
- reserved += 1 + sdp->sd_log_commited_buf + sdp->sd_log_commited_buf/503;
- if (sdp->sd_log_commited_revoke)
- reserved += gfs2_struct2blk(sdp, sdp->sd_log_commited_revoke,
- sizeof(uint64_t));
-
- 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);
+ gfs2_log_unlock(sdp);
+}
- sdp->sd_log_blks_reserved = reserved;
+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);
}
/**
void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
{
log_refund(sdp, tr);
- lops_incore_commit(sdp, tr);
+ buf_lo_incore_commit(sdp, tr);
- sdp->sd_vfs->s_dirt = 1;
- unlock_from_trans(sdp);
-
- kfree(tr);
+ up_read(&sdp->sd_log_flush_lock);
gfs2_log_lock(sdp);
- if (sdp->sd_log_num_buf > gfs2_tune_get(sdp, gt_incore_log_blocks)) {
- gfs2_log_unlock(sdp);
- gfs2_log_flush(sdp);
- } else
- gfs2_log_unlock(sdp);
+ if (sdp->sd_log_num_buf > gfs2_tune_get(sdp, gt_incore_log_blocks))
+ wake_up_process(sdp->sd_logd_process);
+ gfs2_log_unlock(sdp);
}
/**
void gfs2_log_shutdown(struct gfs2_sbd *sdp)
{
- down(&sdp->sd_log_flush_lock);
+ down_write(&sdp->sd_log_flush_lock);
- gfs2_assert_withdraw(sdp, !atomic_read(&sdp->sd_log_trans_count));
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);
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_withdraw(sdp, sdp->sd_log_blks_free ==
- sdp->sd_jdesc->jd_blocks);
- gfs2_assert_withdraw(sdp, sdp->sd_log_head == sdp->sd_log_tail);
- gfs2_assert_withdraw(sdp, list_empty(&sdp->sd_ail2_list));
+ gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) == sdp->sd_jdesc->jd_blocks);
+ gfs2_assert_warn(sdp, sdp->sd_log_head == sdp->sd_log_tail);
+ gfs2_assert_warn(sdp, list_empty(&sdp->sd_ail2_list));
sdp->sd_log_head = sdp->sd_log_flush_head;
- if (sdp->sd_log_flush_wrapped)
- sdp->sd_log_wraps++;
sdp->sd_log_tail = sdp->sd_log_head;
- up(&sdp->sd_log_flush_lock);
+ up_write(&sdp->sd_log_flush_lock);
+}
+
+
+/**
+ * gfs2_meta_syncfs - sync all the buffers in a filesystem
+ * @sdp: the filesystem
+ *
+ */
+
+void gfs2_meta_syncfs(struct gfs2_sbd *sdp)
+{
+ gfs2_log_flush(sdp, NULL);
+ for (;;) {
+ gfs2_ail1_start(sdp, DIO_ALL);
+ if (gfs2_ail1_empty(sdp, DIO_ALL))
+ break;
+ msleep(10);
+ }
+}
+
+
+/**
+ * gfs2_logd - Update log tail as Active Items get flushed to in-place blocks
+ * @sdp: Pointer to GFS2 superblock
+ *
+ * Also, periodically check to make sure that we're using the most recent
+ * journal index.
+ */
+
+int gfs2_logd(void *data)
+{
+ struct gfs2_sbd *sdp = data;
+ unsigned long t;
+ int need_flush;
+
+ while (!kthread_should_stop()) {
+ /* Advance the log tail */
+
+ t = sdp->sd_log_flush_time +
+ gfs2_tune_get(sdp, gt_log_flush_secs) * HZ;
+
+ gfs2_ail1_empty(sdp, DIO_ALL);
+ gfs2_log_lock(sdp);
+ need_flush = sdp->sd_log_num_buf > gfs2_tune_get(sdp, gt_incore_log_blocks);
+ gfs2_log_unlock(sdp);
+ if (need_flush || time_after_eq(jiffies, t)) {
+ gfs2_log_flush(sdp, NULL);
+ sdp->sd_log_flush_time = jiffies;
+ }
+
+ t = gfs2_tune_get(sdp, gt_logd_secs) * HZ;
+ if (freezing(current))
+ refrigerator();
+ schedule_timeout_interruptible(t);
+ }
+
+ return 0;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff