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Diffstat (limited to 'fs/jbd2/commit.c')
-rw-r--r--fs/jbd2/commit.c158
1 files changed, 135 insertions, 23 deletions
diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index eef6979821a..af5280fb579 100644
--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -28,7 +28,6 @@
#include <linux/blkdev.h>
#include <linux/bitops.h>
#include <trace/events/jbd2.h>
-#include <asm/system.h>
/*
* Default IO end handler for temporary BJ_IO buffer_heads.
@@ -86,6 +85,24 @@ nope:
__brelse(bh);
}
+static void jbd2_commit_block_csum_set(journal_t *j,
+ struct journal_head *descriptor)
+{
+ struct commit_header *h;
+ __u32 csum;
+
+ if (!JBD2_HAS_INCOMPAT_FEATURE(j, JBD2_FEATURE_INCOMPAT_CSUM_V2))
+ return;
+
+ h = (struct commit_header *)(jh2bh(descriptor)->b_data);
+ h->h_chksum_type = 0;
+ h->h_chksum_size = 0;
+ h->h_chksum[0] = 0;
+ csum = jbd2_chksum(j, j->j_csum_seed, jh2bh(descriptor)->b_data,
+ j->j_blocksize);
+ h->h_chksum[0] = cpu_to_be32(csum);
+}
+
/*
* Done it all: now submit the commit record. We should have
* cleaned up our previous buffers by now, so if we are in abort
@@ -129,6 +146,7 @@ static int journal_submit_commit_record(journal_t *journal,
tmp->h_chksum_size = JBD2_CRC32_CHKSUM_SIZE;
tmp->h_chksum[0] = cpu_to_be32(crc32_sum);
}
+ jbd2_commit_block_csum_set(journal, descriptor);
JBUFFER_TRACE(descriptor, "submit commit block");
lock_buffer(bh);
@@ -286,10 +304,10 @@ static __u32 jbd2_checksum_data(__u32 crc32_sum, struct buffer_head *bh)
char *addr;
__u32 checksum;
- addr = kmap_atomic(page, KM_USER0);
+ addr = kmap_atomic(page);
checksum = crc32_be(crc32_sum,
(void *)(addr + offset_in_page(bh->b_data)), bh->b_size);
- kunmap_atomic(addr, KM_USER0);
+ kunmap_atomic(addr);
return checksum;
}
@@ -302,6 +320,44 @@ static void write_tag_block(int tag_bytes, journal_block_tag_t *tag,
tag->t_blocknr_high = cpu_to_be32((block >> 31) >> 1);
}
+static void jbd2_descr_block_csum_set(journal_t *j,
+ struct journal_head *descriptor)
+{
+ struct jbd2_journal_block_tail *tail;
+ __u32 csum;
+
+ if (!JBD2_HAS_INCOMPAT_FEATURE(j, JBD2_FEATURE_INCOMPAT_CSUM_V2))
+ return;
+
+ tail = (struct jbd2_journal_block_tail *)
+ (jh2bh(descriptor)->b_data + j->j_blocksize -
+ sizeof(struct jbd2_journal_block_tail));
+ tail->t_checksum = 0;
+ csum = jbd2_chksum(j, j->j_csum_seed, jh2bh(descriptor)->b_data,
+ j->j_blocksize);
+ tail->t_checksum = cpu_to_be32(csum);
+}
+
+static void jbd2_block_tag_csum_set(journal_t *j, journal_block_tag_t *tag,
+ struct buffer_head *bh, __u32 sequence)
+{
+ struct page *page = bh->b_page;
+ __u8 *addr;
+ __u32 csum;
+
+ if (!JBD2_HAS_INCOMPAT_FEATURE(j, JBD2_FEATURE_INCOMPAT_CSUM_V2))
+ return;
+
+ sequence = cpu_to_be32(sequence);
+ addr = kmap_atomic(page);
+ csum = jbd2_chksum(j, j->j_csum_seed, (__u8 *)&sequence,
+ sizeof(sequence));
+ csum = jbd2_chksum(j, csum, addr + offset_in_page(bh->b_data),
+ bh->b_size);
+ kunmap_atomic(addr);
+
+ tag->t_checksum = cpu_to_be32(csum);
+}
/*
* jbd2_journal_commit_transaction
*
@@ -331,6 +387,14 @@ void jbd2_journal_commit_transaction(journal_t *journal)
struct buffer_head *cbh = NULL; /* For transactional checksums */
__u32 crc32_sum = ~0;
struct blk_plug plug;
+ /* Tail of the journal */
+ unsigned long first_block;
+ tid_t first_tid;
+ int update_tail;
+ int csum_size = 0;
+
+ if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_CSUM_V2))
+ csum_size = sizeof(struct jbd2_journal_block_tail);
/*
* First job: lock down the current transaction and wait for
@@ -340,7 +404,18 @@ void jbd2_journal_commit_transaction(journal_t *journal)
/* Do we need to erase the effects of a prior jbd2_journal_flush? */
if (journal->j_flags & JBD2_FLUSHED) {
jbd_debug(3, "super block updated\n");
- jbd2_journal_update_superblock(journal, 1);
+ mutex_lock(&journal->j_checkpoint_mutex);
+ /*
+ * We hold j_checkpoint_mutex so tail cannot change under us.
+ * We don't need any special data guarantees for writing sb
+ * since journal is empty and it is ok for write to be
+ * flushed only with transaction commit.
+ */
+ jbd2_journal_update_sb_log_tail(journal,
+ journal->j_tail_sequence,
+ journal->j_tail,
+ WRITE_SYNC);
+ mutex_unlock(&journal->j_checkpoint_mutex);
} else {
jbd_debug(3, "superblock not updated\n");
}
@@ -352,7 +427,7 @@ void jbd2_journal_commit_transaction(journal_t *journal)
J_ASSERT(commit_transaction->t_state == T_RUNNING);
trace_jbd2_start_commit(journal, commit_transaction);
- jbd_debug(1, "JBD: starting commit of transaction %d\n",
+ jbd_debug(1, "JBD2: starting commit of transaction %d\n",
commit_transaction->t_tid);
write_lock(&journal->j_state_lock);
@@ -427,7 +502,13 @@ void jbd2_journal_commit_transaction(journal_t *journal)
__jbd2_journal_clean_checkpoint_list(journal);
spin_unlock(&journal->j_list_lock);
- jbd_debug (3, "JBD: commit phase 1\n");
+ jbd_debug(3, "JBD2: commit phase 1\n");
+
+ /*
+ * Clear revoked flag to reflect there is no revoked buffers
+ * in the next transaction which is going to be started.
+ */
+ jbd2_clear_buffer_revoked_flags(journal);
/*
* Switch to a new revoke table.
@@ -447,7 +528,7 @@ void jbd2_journal_commit_transaction(journal_t *journal)
wake_up(&journal->j_wait_transaction_locked);
write_unlock(&journal->j_state_lock);
- jbd_debug (3, "JBD: commit phase 2\n");
+ jbd_debug(3, "JBD2: commit phase 2\n");
/*
* Now start flushing things to disk, in the order they appear
@@ -462,7 +543,7 @@ void jbd2_journal_commit_transaction(journal_t *journal)
WRITE_SYNC);
blk_finish_plug(&plug);
- jbd_debug(3, "JBD: commit phase 2\n");
+ jbd_debug(3, "JBD2: commit phase 2\n");
/*
* Way to go: we have now written out all of the data for a
@@ -522,7 +603,7 @@ void jbd2_journal_commit_transaction(journal_t *journal)
J_ASSERT (bufs == 0);
- jbd_debug(4, "JBD: get descriptor\n");
+ jbd_debug(4, "JBD2: get descriptor\n");
descriptor = jbd2_journal_get_descriptor_buffer(journal);
if (!descriptor) {
@@ -531,7 +612,7 @@ void jbd2_journal_commit_transaction(journal_t *journal)
}
bh = jh2bh(descriptor);
- jbd_debug(4, "JBD: got buffer %llu (%p)\n",
+ jbd_debug(4, "JBD2: got buffer %llu (%p)\n",
(unsigned long long)bh->b_blocknr, bh->b_data);
header = (journal_header_t *)&bh->b_data[0];
header->h_magic = cpu_to_be32(JBD2_MAGIC_NUMBER);
@@ -607,7 +688,9 @@ void jbd2_journal_commit_transaction(journal_t *journal)
tag = (journal_block_tag_t *) tagp;
write_tag_block(tag_bytes, tag, jh2bh(jh)->b_blocknr);
- tag->t_flags = cpu_to_be32(tag_flag);
+ tag->t_flags = cpu_to_be16(tag_flag);
+ jbd2_block_tag_csum_set(journal, tag, jh2bh(new_jh),
+ commit_transaction->t_tid);
tagp += tag_bytes;
space_left -= tag_bytes;
@@ -623,16 +706,17 @@ void jbd2_journal_commit_transaction(journal_t *journal)
if (bufs == journal->j_wbufsize ||
commit_transaction->t_buffers == NULL ||
- space_left < tag_bytes + 16) {
+ space_left < tag_bytes + 16 + csum_size) {
- jbd_debug(4, "JBD: Submit %d IOs\n", bufs);
+ jbd_debug(4, "JBD2: Submit %d IOs\n", bufs);
/* Write an end-of-descriptor marker before
submitting the IOs. "tag" still points to
the last tag we set up. */
- tag->t_flags |= cpu_to_be32(JBD2_FLAG_LAST_TAG);
+ tag->t_flags |= cpu_to_be16(JBD2_FLAG_LAST_TAG);
+ jbd2_descr_block_csum_set(journal, descriptor);
start_journal_io:
for (i = 0; i < bufs; i++) {
struct buffer_head *bh = wbuf[i];
@@ -671,10 +755,30 @@ start_journal_io:
err = 0;
}
+ /*
+ * Get current oldest transaction in the log before we issue flush
+ * to the filesystem device. After the flush we can be sure that
+ * blocks of all older transactions are checkpointed to persistent
+ * storage and we will be safe to update journal start in the
+ * superblock with the numbers we get here.
+ */
+ update_tail =
+ jbd2_journal_get_log_tail(journal, &first_tid, &first_block);
+
write_lock(&journal->j_state_lock);
+ if (update_tail) {
+ long freed = first_block - journal->j_tail;
+
+ if (first_block < journal->j_tail)
+ freed += journal->j_last - journal->j_first;
+ /* Update tail only if we free significant amount of space */
+ if (freed < journal->j_maxlen / 4)
+ update_tail = 0;
+ }
J_ASSERT(commit_transaction->t_state == T_COMMIT);
commit_transaction->t_state = T_COMMIT_DFLUSH;
write_unlock(&journal->j_state_lock);
+
/*
* If the journal is not located on the file system device,
* then we must flush the file system device before we issue
@@ -683,7 +787,7 @@ start_journal_io:
if (commit_transaction->t_need_data_flush &&
(journal->j_fs_dev != journal->j_dev) &&
(journal->j_flags & JBD2_BARRIER))
- blkdev_issue_flush(journal->j_fs_dev, GFP_KERNEL, NULL);
+ blkdev_issue_flush(journal->j_fs_dev, GFP_NOFS, NULL);
/* Done it all: now write the commit record asynchronously. */
if (JBD2_HAS_INCOMPAT_FEATURE(journal,
@@ -707,7 +811,7 @@ start_journal_io:
so we incur less scheduling load.
*/
- jbd_debug(3, "JBD: commit phase 3\n");
+ jbd_debug(3, "JBD2: commit phase 3\n");
/*
* akpm: these are BJ_IO, and j_list_lock is not needed.
@@ -771,7 +875,7 @@ wait_for_iobuf:
J_ASSERT (commit_transaction->t_shadow_list == NULL);
- jbd_debug(3, "JBD: commit phase 4\n");
+ jbd_debug(3, "JBD2: commit phase 4\n");
/* Here we wait for the revoke record and descriptor record buffers */
wait_for_ctlbuf:
@@ -801,7 +905,7 @@ wait_for_iobuf:
if (err)
jbd2_journal_abort(journal, err);
- jbd_debug(3, "JBD: commit phase 5\n");
+ jbd_debug(3, "JBD2: commit phase 5\n");
write_lock(&journal->j_state_lock);
J_ASSERT(commit_transaction->t_state == T_COMMIT_DFLUSH);
commit_transaction->t_state = T_COMMIT_JFLUSH;
@@ -819,18 +923,26 @@ wait_for_iobuf:
if (JBD2_HAS_INCOMPAT_FEATURE(journal,
JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT) &&
journal->j_flags & JBD2_BARRIER) {
- blkdev_issue_flush(journal->j_dev, GFP_KERNEL, NULL);
+ blkdev_issue_flush(journal->j_dev, GFP_NOFS, NULL);
}
if (err)
jbd2_journal_abort(journal, err);
+ /*
+ * Now disk caches for filesystem device are flushed so we are safe to
+ * erase checkpointed transactions from the log by updating journal
+ * superblock.
+ */
+ if (update_tail)
+ jbd2_update_log_tail(journal, first_tid, first_block);
+
/* End of a transaction! Finally, we can do checkpoint
processing: any buffers committed as a result of this
transaction can be removed from any checkpoint list it was on
before. */
- jbd_debug(3, "JBD: commit phase 6\n");
+ jbd_debug(3, "JBD2: commit phase 6\n");
J_ASSERT(list_empty(&commit_transaction->t_inode_list));
J_ASSERT(commit_transaction->t_buffers == NULL);
@@ -964,7 +1076,7 @@ restart_loop:
/* Done with this transaction! */
- jbd_debug(3, "JBD: commit phase 7\n");
+ jbd_debug(3, "JBD2: commit phase 7\n");
J_ASSERT(commit_transaction->t_state == T_COMMIT_JFLUSH);
@@ -1039,10 +1151,10 @@ restart_loop:
journal->j_commit_callback(journal, commit_transaction);
trace_jbd2_end_commit(journal, commit_transaction);
- jbd_debug(1, "JBD: commit %d complete, head %d\n",
+ jbd_debug(1, "JBD2: commit %d complete, head %d\n",
journal->j_commit_sequence, journal->j_tail_sequence);
if (to_free)
- kfree(commit_transaction);
+ jbd2_journal_free_transaction(commit_transaction);
wake_up(&journal->j_wait_done_commit);
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-08-24 07:38:20 +0000