From bedbef8ad3e75a304af6361af235302bcc61d06b Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 14 May 2024 06:39:01 +0000
Subject: [PATCH] 修改内核路径
---
kernel/fs/jbd2/journal.c | 603 ++++++++++++++++++++++++++++++++++++++++--------------
1 files changed, 441 insertions(+), 162 deletions(-)
diff --git a/kernel/fs/jbd2/journal.c b/kernel/fs/jbd2/journal.c
index 8a50722..f706d93 100644
--- a/kernel/fs/jbd2/journal.c
+++ b/kernel/fs/jbd2/journal.c
@@ -66,9 +66,6 @@
EXPORT_SYMBOL(jbd2_journal_set_triggers);
EXPORT_SYMBOL(jbd2_journal_dirty_metadata);
EXPORT_SYMBOL(jbd2_journal_forget);
-#if 0
-EXPORT_SYMBOL(journal_sync_buffer);
-#endif
EXPORT_SYMBOL(jbd2_journal_flush);
EXPORT_SYMBOL(jbd2_journal_revoke);
@@ -92,16 +89,15 @@
EXPORT_SYMBOL(jbd2_journal_invalidatepage);
EXPORT_SYMBOL(jbd2_journal_try_to_free_buffers);
EXPORT_SYMBOL(jbd2_journal_force_commit);
-EXPORT_SYMBOL(jbd2_journal_inode_add_write);
-EXPORT_SYMBOL(jbd2_journal_inode_add_wait);
EXPORT_SYMBOL(jbd2_journal_inode_ranged_write);
EXPORT_SYMBOL(jbd2_journal_inode_ranged_wait);
+EXPORT_SYMBOL(jbd2_journal_submit_inode_data_buffers);
+EXPORT_SYMBOL(jbd2_journal_finish_inode_data_buffers);
EXPORT_SYMBOL(jbd2_journal_init_jbd_inode);
EXPORT_SYMBOL(jbd2_journal_release_jbd_inode);
EXPORT_SYMBOL(jbd2_journal_begin_ordered_truncate);
EXPORT_SYMBOL(jbd2_inode_cache);
-static void __journal_abort_soft (journal_t *journal, int errno);
static int jbd2_journal_create_slab(size_t slab_size);
#ifdef CONFIG_JBD2_DEBUG
@@ -144,22 +140,6 @@
return cpu_to_be32(csum);
}
-static int jbd2_superblock_csum_verify(journal_t *j, journal_superblock_t *sb)
-{
- if (!jbd2_journal_has_csum_v2or3(j))
- return 1;
-
- return sb->s_checksum == jbd2_superblock_csum(j, sb);
-}
-
-static void jbd2_superblock_csum_set(journal_t *j, journal_superblock_t *sb)
-{
- if (!jbd2_journal_has_csum_v2or3(j))
- return;
-
- sb->s_checksum = jbd2_superblock_csum(j, sb);
-}
-
/*
* Helper function used to manage commit timeouts
*/
@@ -179,7 +159,9 @@
*
* 1) COMMIT: Every so often we need to commit the current state of the
* filesystem to disk. The journal thread is responsible for writing
- * all of the metadata buffers to disk.
+ * all of the metadata buffers to disk. If a fast commit is ongoing
+ * journal thread waits until it's done and then continues from
+ * there on.
*
* 2) CHECKPOINT: We cannot reuse a used section of the log file until all
* of the data in that part of the log has been rewritten elsewhere on
@@ -221,7 +203,7 @@
if (journal->j_flags & JBD2_UNMOUNT)
goto end_loop;
- jbd_debug(1, "commit_sequence=%d, commit_request=%d\n",
+ jbd_debug(1, "commit_sequence=%u, commit_request=%u\n",
journal->j_commit_sequence, journal->j_commit_request);
if (journal->j_commit_sequence != journal->j_commit_request) {
@@ -342,7 +324,7 @@
* IO is in progress. do_get_write_access() handles this.
*
* The function returns a pointer to the buffer_head to be used for IO.
- *
+ *
*
* Return value:
* <0: Error
@@ -384,7 +366,7 @@
/* keep subsequent assertions sane */
atomic_set(&new_bh->b_count, 1);
- jbd_lock_bh_state(bh_in);
+ spin_lock(&jh_in->b_state_lock);
repeat:
/*
* If a new transaction has already done a buffer copy-out, then
@@ -426,13 +408,13 @@
if (need_copy_out && !done_copy_out) {
char *tmp;
- jbd_unlock_bh_state(bh_in);
+ spin_unlock(&jh_in->b_state_lock);
tmp = jbd2_alloc(bh_in->b_size, GFP_NOFS);
if (!tmp) {
brelse(new_bh);
return -ENOMEM;
}
- jbd_lock_bh_state(bh_in);
+ spin_lock(&jh_in->b_state_lock);
if (jh_in->b_frozen_data) {
jbd2_free(tmp, bh_in->b_size);
goto repeat;
@@ -485,7 +467,7 @@
__jbd2_journal_file_buffer(jh_in, transaction, BJ_Shadow);
spin_unlock(&journal->j_list_lock);
set_buffer_shadow(bh_in);
- jbd_unlock_bh_state(bh_in);
+ spin_unlock(&jh_in->b_state_lock);
return do_escape | (done_copy_out << 1);
}
@@ -518,7 +500,7 @@
*/
journal->j_commit_request = target;
- jbd_debug(1, "JBD2: requesting commit %d/%d\n",
+ jbd_debug(1, "JBD2: requesting commit %u/%u\n",
journal->j_commit_request,
journal->j_commit_sequence);
journal->j_running_transaction->t_requested = jiffies;
@@ -531,7 +513,7 @@
WARN_ONCE(1, "JBD2: bad log_start_commit: %u %u %u %u\n",
journal->j_commit_request,
journal->j_commit_sequence,
- target, journal->j_running_transaction ?
+ target, journal->j_running_transaction ?
journal->j_running_transaction->t_tid : 0);
return 0;
}
@@ -584,12 +566,14 @@
}
/**
- * Force and wait upon a commit if the calling process is not within
- * transaction. This is used for forcing out undo-protected data which contains
- * bitmaps, when the fs is running out of space.
+ * jbd2_journal_force_commit_nested - Force and wait upon a commit if the
+ * calling process is not within transaction.
*
* @journal: journal to force
* Returns true if progress was made.
+ *
+ * This is used for forcing out undo-protected data which contains
+ * bitmaps, when the fs is running out of space.
*/
int jbd2_journal_force_commit_nested(journal_t *journal)
{
@@ -600,7 +584,7 @@
}
/**
- * int journal_force_commit() - force any uncommitted transactions
+ * jbd2_journal_force_commit() - force any uncommitted transactions
* @journal: journal to force
*
* Caller want unconditional commit. We can only force the running transaction
@@ -716,12 +700,12 @@
#ifdef CONFIG_JBD2_DEBUG
if (!tid_geq(journal->j_commit_request, tid)) {
printk(KERN_ERR
- "%s: error: j_commit_request=%d, tid=%d\n",
+ "%s: error: j_commit_request=%u, tid=%u\n",
__func__, journal->j_commit_request, tid);
}
#endif
while (tid_gt(tid, journal->j_commit_sequence)) {
- jbd_debug(1, "JBD2: want %d, j_commit_sequence=%d\n",
+ jbd_debug(1, "JBD2: want %u, j_commit_sequence=%u\n",
tid, journal->j_commit_sequence);
read_unlock(&journal->j_state_lock);
wake_up(&journal->j_wait_commit);
@@ -735,6 +719,87 @@
err = -EIO;
return err;
}
+
+/*
+ * Start a fast commit. If there's an ongoing fast or full commit wait for
+ * it to complete. Returns 0 if a new fast commit was started. Returns -EALREADY
+ * if a fast commit is not needed, either because there's an already a commit
+ * going on or this tid has already been committed. Returns -EINVAL if no jbd2
+ * commit has yet been performed.
+ */
+int jbd2_fc_begin_commit(journal_t *journal, tid_t tid)
+{
+ if (unlikely(is_journal_aborted(journal)))
+ return -EIO;
+ /*
+ * Fast commits only allowed if at least one full commit has
+ * been processed.
+ */
+ if (!journal->j_stats.ts_tid)
+ return -EINVAL;
+
+ write_lock(&journal->j_state_lock);
+ if (tid <= journal->j_commit_sequence) {
+ write_unlock(&journal->j_state_lock);
+ return -EALREADY;
+ }
+
+ if (journal->j_flags & JBD2_FULL_COMMIT_ONGOING ||
+ (journal->j_flags & JBD2_FAST_COMMIT_ONGOING)) {
+ DEFINE_WAIT(wait);
+
+ prepare_to_wait(&journal->j_fc_wait, &wait,
+ TASK_UNINTERRUPTIBLE);
+ write_unlock(&journal->j_state_lock);
+ schedule();
+ finish_wait(&journal->j_fc_wait, &wait);
+ return -EALREADY;
+ }
+ journal->j_flags |= JBD2_FAST_COMMIT_ONGOING;
+ write_unlock(&journal->j_state_lock);
+ jbd2_journal_lock_updates(journal);
+
+ return 0;
+}
+EXPORT_SYMBOL(jbd2_fc_begin_commit);
+
+/*
+ * Stop a fast commit. If fallback is set, this function starts commit of
+ * TID tid before any other fast commit can start.
+ */
+static int __jbd2_fc_end_commit(journal_t *journal, tid_t tid, bool fallback)
+{
+ jbd2_journal_unlock_updates(journal);
+ if (journal->j_fc_cleanup_callback)
+ journal->j_fc_cleanup_callback(journal, 0);
+ write_lock(&journal->j_state_lock);
+ journal->j_flags &= ~JBD2_FAST_COMMIT_ONGOING;
+ if (fallback)
+ journal->j_flags |= JBD2_FULL_COMMIT_ONGOING;
+ write_unlock(&journal->j_state_lock);
+ wake_up(&journal->j_fc_wait);
+ if (fallback)
+ return jbd2_complete_transaction(journal, tid);
+ return 0;
+}
+
+int jbd2_fc_end_commit(journal_t *journal)
+{
+ return __jbd2_fc_end_commit(journal, 0, false);
+}
+EXPORT_SYMBOL(jbd2_fc_end_commit);
+
+int jbd2_fc_end_commit_fallback(journal_t *journal)
+{
+ tid_t tid;
+
+ read_lock(&journal->j_state_lock);
+ tid = journal->j_running_transaction ?
+ journal->j_running_transaction->t_tid : 0;
+ read_unlock(&journal->j_state_lock);
+ return __jbd2_fc_end_commit(journal, tid, true);
+}
+EXPORT_SYMBOL(jbd2_fc_end_commit_fallback);
/* Return 1 when transaction with given tid has already committed. */
int jbd2_transaction_committed(journal_t *journal, tid_t tid)
@@ -804,6 +869,106 @@
return jbd2_journal_bmap(journal, blocknr, retp);
}
+/* Map one fast commit buffer for use by the file system */
+int jbd2_fc_get_buf(journal_t *journal, struct buffer_head **bh_out)
+{
+ unsigned long long pblock;
+ unsigned long blocknr;
+ int ret = 0;
+ struct buffer_head *bh;
+ int fc_off;
+
+ *bh_out = NULL;
+
+ if (journal->j_fc_off + journal->j_fc_first < journal->j_fc_last) {
+ fc_off = journal->j_fc_off;
+ blocknr = journal->j_fc_first + fc_off;
+ journal->j_fc_off++;
+ } else {
+ ret = -EINVAL;
+ }
+
+ if (ret)
+ return ret;
+
+ ret = jbd2_journal_bmap(journal, blocknr, &pblock);
+ if (ret)
+ return ret;
+
+ bh = __getblk(journal->j_dev, pblock, journal->j_blocksize);
+ if (!bh)
+ return -ENOMEM;
+
+
+ journal->j_fc_wbuf[fc_off] = bh;
+
+ *bh_out = bh;
+
+ return 0;
+}
+EXPORT_SYMBOL(jbd2_fc_get_buf);
+
+/*
+ * Wait on fast commit buffers that were allocated by jbd2_fc_get_buf
+ * for completion.
+ */
+int jbd2_fc_wait_bufs(journal_t *journal, int num_blks)
+{
+ struct buffer_head *bh;
+ int i, j_fc_off;
+
+ j_fc_off = journal->j_fc_off;
+
+ /*
+ * Wait in reverse order to minimize chances of us being woken up before
+ * all IOs have completed
+ */
+ for (i = j_fc_off - 1; i >= j_fc_off - num_blks; i--) {
+ bh = journal->j_fc_wbuf[i];
+ wait_on_buffer(bh);
+ /*
+ * Update j_fc_off so jbd2_fc_release_bufs can release remain
+ * buffer head.
+ */
+ if (unlikely(!buffer_uptodate(bh))) {
+ journal->j_fc_off = i + 1;
+ return -EIO;
+ }
+ put_bh(bh);
+ journal->j_fc_wbuf[i] = NULL;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(jbd2_fc_wait_bufs);
+
+/*
+ * Wait on fast commit buffers that were allocated by jbd2_fc_get_buf
+ * for completion.
+ */
+int jbd2_fc_release_bufs(journal_t *journal)
+{
+ struct buffer_head *bh;
+ int i, j_fc_off;
+
+ j_fc_off = journal->j_fc_off;
+
+ /*
+ * Wait in reverse order to minimize chances of us being woken up before
+ * all IOs have completed
+ */
+ for (i = j_fc_off - 1; i >= 0; i--) {
+ bh = journal->j_fc_wbuf[i];
+ if (!bh)
+ break;
+ put_bh(bh);
+ journal->j_fc_wbuf[i] = NULL;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(jbd2_fc_release_bufs);
+
/*
* Conversion of logical to physical block numbers for the journal
*
@@ -816,18 +981,22 @@
{
int err = 0;
unsigned long long ret;
+ sector_t block = 0;
if (journal->j_inode) {
- ret = bmap(journal->j_inode, blocknr);
- if (ret)
- *retp = ret;
- else {
+ block = blocknr;
+ ret = bmap(journal->j_inode, &block);
+
+ if (ret || !block) {
printk(KERN_ALERT "%s: journal block not found "
"at offset %lu on %s\n",
__func__, blocknr, journal->j_devname);
err = -EIO;
- __journal_abort_soft(journal, err);
+ jbd2_journal_abort(journal, err);
+ } else {
+ *retp = block;
}
+
} else {
*retp = blocknr; /* +journal->j_blk_offset */
}
@@ -861,6 +1030,7 @@
bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize);
if (!bh)
return NULL;
+ atomic_dec(&transaction->t_outstanding_credits);
lock_buffer(bh);
memset(bh->b_data, 0, journal->j_blocksize);
header = (journal_header_t *)bh->b_data;
@@ -962,7 +1132,7 @@
trace_jbd2_update_log_tail(journal, tid, block, freed);
jbd_debug(1,
- "Cleaning journal tail from %d to %d (offset %lu), "
+ "Cleaning journal tail from %u to %u (offset %lu), "
"freeing %lu\n",
journal->j_tail_sequence, tid, block, freed);
@@ -1095,12 +1265,11 @@
return seq_release(inode, file);
}
-static const struct file_operations jbd2_seq_info_fops = {
- .owner = THIS_MODULE,
- .open = jbd2_seq_info_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = jbd2_seq_info_release,
+static const struct proc_ops jbd2_info_proc_ops = {
+ .proc_open = jbd2_seq_info_open,
+ .proc_read = seq_read,
+ .proc_lseek = seq_lseek,
+ .proc_release = jbd2_seq_info_release,
};
static struct proc_dir_entry *proc_jbd2_stats;
@@ -1110,7 +1279,7 @@
journal->j_proc_entry = proc_mkdir(journal->j_devname, proc_jbd2_stats);
if (journal->j_proc_entry) {
proc_create_data("info", S_IRUGO, journal->j_proc_entry,
- &jbd2_seq_info_fops, journal);
+ &jbd2_info_proc_ops, journal);
}
}
@@ -1118,6 +1287,16 @@
{
remove_proc_entry("info", journal->j_proc_entry);
remove_proc_entry(journal->j_devname, proc_jbd2_stats);
+}
+
+/* Minimum size of descriptor tag */
+static int jbd2_min_tag_size(void)
+{
+ /*
+ * Tag with 32-bit block numbers does not use last four bytes of the
+ * structure
+ */
+ return sizeof(journal_block_tag_t) - 4;
}
/*
@@ -1148,6 +1327,8 @@
init_waitqueue_head(&journal->j_wait_commit);
init_waitqueue_head(&journal->j_wait_updates);
init_waitqueue_head(&journal->j_wait_reserved);
+ init_waitqueue_head(&journal->j_fc_wait);
+ mutex_init(&journal->j_abort_mutex);
mutex_init(&journal->j_barrier);
mutex_init(&journal->j_checkpoint_mutex);
spin_lock_init(&journal->j_revoke_lock);
@@ -1177,9 +1358,11 @@
journal->j_dev = bdev;
journal->j_fs_dev = fs_dev;
journal->j_blk_offset = start;
- journal->j_maxlen = len;
- n = journal->j_blocksize / sizeof(journal_block_tag_t);
+ journal->j_total_len = len;
+ /* We need enough buffers to write out full descriptor block. */
+ n = journal->j_blocksize / jbd2_min_tag_size();
journal->j_wbufsize = n;
+ journal->j_fc_wbuf = NULL;
journal->j_wbuf = kmalloc_array(n, sizeof(struct buffer_head *),
GFP_KERNEL);
if (!journal->j_wbuf)
@@ -1254,11 +1437,14 @@
journal_t *jbd2_journal_init_inode(struct inode *inode)
{
journal_t *journal;
+ sector_t blocknr;
char *p;
- unsigned long long blocknr;
+ int err = 0;
- blocknr = bmap(inode, 0);
- if (!blocknr) {
+ blocknr = 0;
+ err = bmap(inode, &blocknr);
+
+ if (err || !blocknr) {
pr_err("%s: Cannot locate journal superblock\n",
__func__);
return NULL;
@@ -1288,7 +1474,7 @@
* superblock as being NULL to prevent the journal destroy from writing
* back a bogus superblock.
*/
-static void journal_fail_superblock (journal_t *journal)
+static void journal_fail_superblock(journal_t *journal)
{
struct buffer_head *bh = journal->j_sb_buffer;
brelse(bh);
@@ -1319,15 +1505,22 @@
journal->j_first = first;
journal->j_last = last;
- journal->j_head = first;
- journal->j_tail = first;
- journal->j_free = last - first;
+ journal->j_head = journal->j_first;
+ journal->j_tail = journal->j_first;
+ journal->j_free = journal->j_last - journal->j_first;
journal->j_tail_sequence = journal->j_transaction_sequence;
journal->j_commit_sequence = journal->j_transaction_sequence - 1;
journal->j_commit_request = journal->j_commit_sequence;
- journal->j_max_transaction_buffers = journal->j_maxlen / 4;
+ journal->j_max_transaction_buffers = jbd2_journal_get_max_txn_bufs(journal);
+
+ /*
+ * Now that journal recovery is done, turn fast commits off here. This
+ * way, if fast commit was enabled before the crash but if now FS has
+ * disabled it, we don't enable fast commits.
+ */
+ jbd2_clear_feature_fast_commit(journal);
/*
* As a special case, if the on-disk copy is already marked as needing
@@ -1337,7 +1530,7 @@
*/
if (sb->s_start == 0) {
jbd_debug(1, "JBD2: Skipping superblock update on recovered sb "
- "(start %ld, seq %d, errno %d)\n",
+ "(start %ld, seq %u, errno %d)\n",
journal->j_tail, journal->j_tail_sequence,
journal->j_errno);
journal->j_flags |= JBD2_FLUSHED;
@@ -1393,7 +1586,8 @@
clear_buffer_write_io_error(bh);
set_buffer_uptodate(bh);
}
- jbd2_superblock_csum_set(journal, sb);
+ if (jbd2_journal_has_csum_v2or3(journal))
+ sb->s_checksum = jbd2_superblock_csum(journal, sb);
get_bh(bh);
bh->b_end_io = end_buffer_write_sync;
ret = submit_bh(REQ_OP_WRITE, write_flags, bh);
@@ -1407,7 +1601,8 @@
printk(KERN_ERR "JBD2: Error %d detected when updating "
"journal superblock for %s.\n", ret,
journal->j_devname);
- jbd2_journal_abort(journal, ret);
+ if (!is_journal_aborted(journal))
+ jbd2_journal_abort(journal, ret);
}
return ret;
@@ -1465,6 +1660,7 @@
static void jbd2_mark_journal_empty(journal_t *journal, int write_op)
{
journal_superblock_t *sb = journal->j_superblock;
+ bool had_fast_commit = false;
BUG_ON(!mutex_is_locked(&journal->j_checkpoint_mutex));
lock_buffer(journal->j_sb_buffer);
@@ -1473,13 +1669,24 @@
return;
}
- jbd_debug(1, "JBD2: Marking journal as empty (seq %d)\n",
+ jbd_debug(1, "JBD2: Marking journal as empty (seq %u)\n",
journal->j_tail_sequence);
sb->s_sequence = cpu_to_be32(journal->j_tail_sequence);
sb->s_start = cpu_to_be32(0);
+ if (jbd2_has_feature_fast_commit(journal)) {
+ /*
+ * When journal is clean, no need to commit fast commit flag and
+ * make file system incompatible with older kernels.
+ */
+ jbd2_clear_feature_fast_commit(journal);
+ had_fast_commit = true;
+ }
jbd2_write_superblock(journal, write_op);
+
+ if (had_fast_commit)
+ jbd2_set_feature_fast_commit(journal);
/* Log is no longer empty */
write_lock(&journal->j_state_lock);
@@ -1510,6 +1717,21 @@
jbd2_write_superblock(journal, REQ_SYNC | REQ_FUA);
}
EXPORT_SYMBOL(jbd2_journal_update_sb_errno);
+
+static int journal_revoke_records_per_block(journal_t *journal)
+{
+ int record_size;
+ int space = journal->j_blocksize - sizeof(jbd2_journal_revoke_header_t);
+
+ if (jbd2_has_feature_64bit(journal))
+ record_size = 8;
+ else
+ record_size = 4;
+
+ if (jbd2_journal_has_csum_v2or3(journal))
+ space -= sizeof(struct jbd2_journal_block_tail);
+ return space / record_size;
+}
/*
* Read the superblock for a given journal, performing initial
@@ -1559,15 +1781,15 @@
goto out;
}
- if (be32_to_cpu(sb->s_maxlen) < journal->j_maxlen)
- journal->j_maxlen = be32_to_cpu(sb->s_maxlen);
- else if (be32_to_cpu(sb->s_maxlen) > journal->j_maxlen) {
+ if (be32_to_cpu(sb->s_maxlen) < journal->j_total_len)
+ journal->j_total_len = be32_to_cpu(sb->s_maxlen);
+ else if (be32_to_cpu(sb->s_maxlen) > journal->j_total_len) {
printk(KERN_WARNING "JBD2: journal file too short\n");
goto out;
}
if (be32_to_cpu(sb->s_first) == 0 ||
- be32_to_cpu(sb->s_first) >= journal->j_maxlen) {
+ be32_to_cpu(sb->s_first) >= journal->j_total_len) {
printk(KERN_WARNING
"JBD2: Invalid start block of journal: %u\n",
be32_to_cpu(sb->s_first));
@@ -1606,18 +1828,21 @@
}
}
- /* Check superblock checksum */
- if (!jbd2_superblock_csum_verify(journal, sb)) {
- printk(KERN_ERR "JBD2: journal checksum error\n");
- err = -EFSBADCRC;
- goto out;
- }
+ if (jbd2_journal_has_csum_v2or3(journal)) {
+ /* Check superblock checksum */
+ if (sb->s_checksum != jbd2_superblock_csum(journal, sb)) {
+ printk(KERN_ERR "JBD2: journal checksum error\n");
+ err = -EFSBADCRC;
+ goto out;
+ }
- /* Precompute checksum seed for all metadata */
- if (jbd2_journal_has_csum_v2or3(journal))
+ /* Precompute checksum seed for all metadata */
journal->j_csum_seed = jbd2_chksum(journal, ~0, sb->s_uuid,
sizeof(sb->s_uuid));
+ }
+ journal->j_revoke_records_per_block =
+ journal_revoke_records_per_block(journal);
set_buffer_verified(bh);
return 0;
@@ -1636,6 +1861,7 @@
{
int err;
journal_superblock_t *sb;
+ int num_fc_blocks;
err = journal_get_superblock(journal);
if (err)
@@ -1646,15 +1872,26 @@
journal->j_tail_sequence = be32_to_cpu(sb->s_sequence);
journal->j_tail = be32_to_cpu(sb->s_start);
journal->j_first = be32_to_cpu(sb->s_first);
- journal->j_last = be32_to_cpu(sb->s_maxlen);
journal->j_errno = be32_to_cpu(sb->s_errno);
+ journal->j_last = be32_to_cpu(sb->s_maxlen);
+
+ if (jbd2_has_feature_fast_commit(journal)) {
+ journal->j_fc_last = be32_to_cpu(sb->s_maxlen);
+ num_fc_blocks = be32_to_cpu(sb->s_num_fc_blks);
+ if (!num_fc_blocks)
+ num_fc_blocks = JBD2_MIN_FC_BLOCKS;
+ if (journal->j_last - num_fc_blocks >= JBD2_MIN_JOURNAL_BLOCKS)
+ journal->j_last = journal->j_fc_last - num_fc_blocks;
+ journal->j_fc_first = journal->j_last + 1;
+ journal->j_fc_off = 0;
+ }
return 0;
}
/**
- * int jbd2_journal_load() - Read journal from disk.
+ * jbd2_journal_load() - Read journal from disk.
* @journal: Journal to act on.
*
* Given a journal_t structure which tells us which disk blocks contain
@@ -1724,7 +1961,7 @@
}
/**
- * void jbd2_journal_destroy() - Release a journal_t structure.
+ * jbd2_journal_destroy() - Release a journal_t structure.
* @journal: Journal to act on.
*
* Release a journal_t structure once it is no longer in use by the
@@ -1792,6 +2029,7 @@
jbd2_journal_destroy_revoke(journal);
if (journal->j_chksum_driver)
crypto_free_shash(journal->j_chksum_driver);
+ kfree(journal->j_fc_wbuf);
kfree(journal->j_wbuf);
kfree(journal);
@@ -1800,7 +2038,7 @@
/**
- *int jbd2_journal_check_used_features () - Check if features specified are used.
+ * jbd2_journal_check_used_features() - Check if features specified are used.
* @journal: Journal to check.
* @compat: bitmask of compatible features
* @ro: bitmask of features that force read-only mount
@@ -1810,7 +2048,7 @@
* features. Return true (non-zero) if it does.
**/
-int jbd2_journal_check_used_features (journal_t *journal, unsigned long compat,
+int jbd2_journal_check_used_features(journal_t *journal, unsigned long compat,
unsigned long ro, unsigned long incompat)
{
journal_superblock_t *sb;
@@ -1835,7 +2073,7 @@
}
/**
- * int jbd2_journal_check_available_features() - Check feature set in journalling layer
+ * jbd2_journal_check_available_features() - Check feature set in journalling layer
* @journal: Journal to check.
* @compat: bitmask of compatible features
* @ro: bitmask of features that force read-only mount
@@ -1845,7 +2083,7 @@
* all of a given set of features on this journal. Return true
* (non-zero) if it can. */
-int jbd2_journal_check_available_features (journal_t *journal, unsigned long compat,
+int jbd2_journal_check_available_features(journal_t *journal, unsigned long compat,
unsigned long ro, unsigned long incompat)
{
if (!compat && !ro && !incompat)
@@ -1866,8 +2104,39 @@
return 0;
}
+static int
+jbd2_journal_initialize_fast_commit(journal_t *journal)
+{
+ journal_superblock_t *sb = journal->j_superblock;
+ unsigned long long num_fc_blks;
+
+ num_fc_blks = be32_to_cpu(sb->s_num_fc_blks);
+ if (num_fc_blks == 0)
+ num_fc_blks = JBD2_MIN_FC_BLOCKS;
+ if (journal->j_last - num_fc_blks < JBD2_MIN_JOURNAL_BLOCKS)
+ return -ENOSPC;
+
+ /* Are we called twice? */
+ WARN_ON(journal->j_fc_wbuf != NULL);
+ journal->j_fc_wbuf = kmalloc_array(num_fc_blks,
+ sizeof(struct buffer_head *), GFP_KERNEL);
+ if (!journal->j_fc_wbuf)
+ return -ENOMEM;
+
+ journal->j_fc_wbufsize = num_fc_blks;
+ journal->j_fc_last = journal->j_last;
+ journal->j_last = journal->j_fc_last - num_fc_blks;
+ journal->j_fc_first = journal->j_last + 1;
+ journal->j_fc_off = 0;
+ journal->j_free = journal->j_last - journal->j_first;
+ journal->j_max_transaction_buffers =
+ jbd2_journal_get_max_txn_bufs(journal);
+
+ return 0;
+}
+
/**
- * int jbd2_journal_set_features () - Mark a given journal feature in the superblock
+ * jbd2_journal_set_features() - Mark a given journal feature in the superblock
* @journal: Journal to act on.
* @compat: bitmask of compatible features
* @ro: bitmask of features that force read-only mount
@@ -1878,7 +2147,7 @@
*
*/
-int jbd2_journal_set_features (journal_t *journal, unsigned long compat,
+int jbd2_journal_set_features(journal_t *journal, unsigned long compat,
unsigned long ro, unsigned long incompat)
{
#define INCOMPAT_FEATURE_ON(f) \
@@ -1908,6 +2177,13 @@
compat, ro, incompat);
sb = journal->j_superblock;
+
+ if (incompat & JBD2_FEATURE_INCOMPAT_FAST_COMMIT) {
+ if (jbd2_journal_initialize_fast_commit(journal)) {
+ pr_err("JBD2: Cannot enable fast commits.\n");
+ return 0;
+ }
+ }
/* Load the checksum driver if necessary */
if ((journal->j_chksum_driver == NULL) &&
@@ -1942,6 +2218,8 @@
sb->s_feature_ro_compat |= cpu_to_be32(ro);
sb->s_feature_incompat |= cpu_to_be32(incompat);
unlock_buffer(journal->j_sb_buffer);
+ journal->j_revoke_records_per_block =
+ journal_revoke_records_per_block(journal);
return 1;
#undef COMPAT_FEATURE_ON
@@ -1949,7 +2227,7 @@
}
/*
- * jbd2_journal_clear_features () - Clear a given journal feature in the
+ * jbd2_journal_clear_features() - Clear a given journal feature in the
* superblock
* @journal: Journal to act on.
* @compat: bitmask of compatible features
@@ -1972,11 +2250,13 @@
sb->s_feature_compat &= ~cpu_to_be32(compat);
sb->s_feature_ro_compat &= ~cpu_to_be32(ro);
sb->s_feature_incompat &= ~cpu_to_be32(incompat);
+ journal->j_revoke_records_per_block =
+ journal_revoke_records_per_block(journal);
}
EXPORT_SYMBOL(jbd2_journal_clear_features);
/**
- * int jbd2_journal_flush () - Flush journal
+ * jbd2_journal_flush() - Flush journal
* @journal: Journal to act on.
*
* Flush all data for a given journal to disk and empty the journal.
@@ -2051,7 +2331,7 @@
}
/**
- * int jbd2_journal_wipe() - Wipe journal contents
+ * jbd2_journal_wipe() - Wipe journal contents
* @journal: Journal to act on.
* @write: flag (see below)
*
@@ -2082,7 +2362,7 @@
err = jbd2_journal_skip_recovery(journal);
if (write) {
/* Lock to make assertions happy... */
- mutex_lock(&journal->j_checkpoint_mutex);
+ mutex_lock_io(&journal->j_checkpoint_mutex);
jbd2_mark_journal_empty(journal, REQ_SYNC | REQ_FUA);
mutex_unlock(&journal->j_checkpoint_mutex);
}
@@ -2091,66 +2371,8 @@
return err;
}
-/*
- * Journal abort has very specific semantics, which we describe
- * for journal abort.
- *
- * Two internal functions, which provide abort to the jbd layer
- * itself are here.
- */
-
-/*
- * Quick version for internal journal use (doesn't lock the journal).
- * Aborts hard --- we mark the abort as occurred, but do _nothing_ else,
- * and don't attempt to make any other journal updates.
- */
-void __jbd2_journal_abort_hard(journal_t *journal)
-{
- transaction_t *transaction;
-
- if (journal->j_flags & JBD2_ABORT)
- return;
-
- printk(KERN_ERR "Aborting journal on device %s.\n",
- journal->j_devname);
-
- write_lock(&journal->j_state_lock);
- journal->j_flags |= JBD2_ABORT;
- transaction = journal->j_running_transaction;
- if (transaction)
- __jbd2_log_start_commit(journal, transaction->t_tid);
- write_unlock(&journal->j_state_lock);
-}
-
-/* Soft abort: record the abort error status in the journal superblock,
- * but don't do any other IO. */
-static void __journal_abort_soft (journal_t *journal, int errno)
-{
- int old_errno;
-
- write_lock(&journal->j_state_lock);
- old_errno = journal->j_errno;
- if (!journal->j_errno || errno == -ESHUTDOWN)
- journal->j_errno = errno;
-
- if (journal->j_flags & JBD2_ABORT) {
- write_unlock(&journal->j_state_lock);
- if (old_errno != -ESHUTDOWN && errno == -ESHUTDOWN)
- jbd2_journal_update_sb_errno(journal);
- return;
- }
- write_unlock(&journal->j_state_lock);
-
- __jbd2_journal_abort_hard(journal);
-
- jbd2_journal_update_sb_errno(journal);
- write_lock(&journal->j_state_lock);
- journal->j_flags |= JBD2_REC_ERR;
- write_unlock(&journal->j_state_lock);
-}
-
/**
- * void jbd2_journal_abort () - Shutdown the journal immediately.
+ * jbd2_journal_abort () - Shutdown the journal immediately.
* @journal: the journal to shutdown.
* @errno: an error number to record in the journal indicating
* the reason for the shutdown.
@@ -2192,11 +2414,56 @@
void jbd2_journal_abort(journal_t *journal, int errno)
{
- __journal_abort_soft(journal, errno);
+ transaction_t *transaction;
+
+ /*
+ * Lock the aborting procedure until everything is done, this avoid
+ * races between filesystem's error handling flow (e.g. ext4_abort()),
+ * ensure panic after the error info is written into journal's
+ * superblock.
+ */
+ mutex_lock(&journal->j_abort_mutex);
+ /*
+ * ESHUTDOWN always takes precedence because a file system check
+ * caused by any other journal abort error is not required after
+ * a shutdown triggered.
+ */
+ write_lock(&journal->j_state_lock);
+ if (journal->j_flags & JBD2_ABORT) {
+ int old_errno = journal->j_errno;
+
+ write_unlock(&journal->j_state_lock);
+ if (old_errno != -ESHUTDOWN && errno == -ESHUTDOWN) {
+ journal->j_errno = errno;
+ jbd2_journal_update_sb_errno(journal);
+ }
+ mutex_unlock(&journal->j_abort_mutex);
+ return;
+ }
+
+ /*
+ * Mark the abort as occurred and start current running transaction
+ * to release all journaled buffer.
+ */
+ pr_err("Aborting journal on device %s.\n", journal->j_devname);
+
+ journal->j_flags |= JBD2_ABORT;
+ journal->j_errno = errno;
+ transaction = journal->j_running_transaction;
+ if (transaction)
+ __jbd2_log_start_commit(journal, transaction->t_tid);
+ write_unlock(&journal->j_state_lock);
+
+ /*
+ * Record errno to the journal super block, so that fsck and jbd2
+ * layer could realise that a filesystem check is needed.
+ */
+ jbd2_journal_update_sb_errno(journal);
+ mutex_unlock(&journal->j_abort_mutex);
}
/**
- * int jbd2_journal_errno () - returns the journal's error state.
+ * jbd2_journal_errno() - returns the journal's error state.
* @journal: journal to examine.
*
* This is the errno number set with jbd2_journal_abort(), the last
@@ -2220,7 +2487,7 @@
}
/**
- * int jbd2_journal_clear_err () - clears the journal's error state
+ * jbd2_journal_clear_err() - clears the journal's error state
* @journal: journal to act on.
*
* An error must be cleared or acked to take a FS out of readonly
@@ -2240,7 +2507,7 @@
}
/**
- * void jbd2_journal_ack_err() - Ack journal err.
+ * jbd2_journal_ack_err() - Ack journal err.
* @journal: journal to act on.
*
* An error must be cleared or acked to take a FS out of readonly
@@ -2428,6 +2695,8 @@
ret = kmem_cache_zalloc(jbd2_journal_head_cache,
GFP_NOFS | __GFP_NOFAIL);
}
+ if (ret)
+ spin_lock_init(&ret->b_state_lock);
return ret;
}
@@ -2534,12 +2803,12 @@
jbd_unlock_bh_journal_head(bh);
return jh;
}
+EXPORT_SYMBOL(jbd2_journal_grab_journal_head);
static void __journal_remove_journal_head(struct buffer_head *bh)
{
struct journal_head *jh = bh2jh(bh);
- J_ASSERT_JH(jh, jh->b_jcount >= 0);
J_ASSERT_JH(jh, jh->b_transaction == NULL);
J_ASSERT_JH(jh, jh->b_next_transaction == NULL);
J_ASSERT_JH(jh, jh->b_cp_transaction == NULL);
@@ -2547,17 +2816,23 @@
J_ASSERT_BH(bh, buffer_jbd(bh));
J_ASSERT_BH(bh, jh2bh(jh) == bh);
BUFFER_TRACE(bh, "remove journal_head");
- if (jh->b_frozen_data) {
- printk(KERN_WARNING "%s: freeing b_frozen_data\n", __func__);
- jbd2_free(jh->b_frozen_data, bh->b_size);
- }
- if (jh->b_committed_data) {
- printk(KERN_WARNING "%s: freeing b_committed_data\n", __func__);
- jbd2_free(jh->b_committed_data, bh->b_size);
- }
+
+ /* Unlink before dropping the lock */
bh->b_private = NULL;
jh->b_bh = NULL; /* debug, really */
clear_buffer_jbd(bh);
+}
+
+static void journal_release_journal_head(struct journal_head *jh, size_t b_size)
+{
+ if (jh->b_frozen_data) {
+ printk(KERN_WARNING "%s: freeing b_frozen_data\n", __func__);
+ jbd2_free(jh->b_frozen_data, b_size);
+ }
+ if (jh->b_committed_data) {
+ printk(KERN_WARNING "%s: freeing b_committed_data\n", __func__);
+ jbd2_free(jh->b_committed_data, b_size);
+ }
journal_free_journal_head(jh);
}
@@ -2575,10 +2850,13 @@
if (!jh->b_jcount) {
__journal_remove_journal_head(bh);
jbd_unlock_bh_journal_head(bh);
+ journal_release_journal_head(jh, bh->b_size);
__brelse(bh);
- } else
+ } else {
jbd_unlock_bh_journal_head(bh);
+ }
}
+EXPORT_SYMBOL(jbd2_journal_put_journal_head);
/*
* Initialize jbd inode head
@@ -2744,6 +3022,7 @@
}
MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(ANDROID_GKI_VFS_EXPORT_ONLY);
module_init(journal_init);
module_exit(journal_exit);
--
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