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Message-Id: <20200309070526.218202-13-harshadshirwadkar@gmail.com>
Date: Mon, 9 Mar 2020 00:05:19 -0700
From: Harshad Shirwadkar <harshadshirwadkar@...il.com>
To: linux-ext4@...r.kernel.org
Cc: Harshad Shirwadkar <harshadshirwadkar@...il.com>
Subject: [PATCH v5 13/20] jbd2: add new APIs for commit path of fast commits
Add following helpers for commit path:
- jbd2_map_fc_buf() - allocates fast commit buffers for caller
- jbd2_wait_on_fc_bufs() - waits on fast commit buffers allocated
using jbd2_map_fc_buf()
- jbd2_submit_inode_data() - submit data buffers for one inode
- jbd2_wait_inode_data() - wait for inode data
Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@...il.com>
---
fs/jbd2/commit.c | 40 +++++++++++++++++++++++
fs/jbd2/journal.c | 76 ++++++++++++++++++++++++++++++++++++++++++++
include/linux/jbd2.h | 6 ++++
3 files changed, 122 insertions(+)
diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index 869fe193fbe3..a4c4c6717674 100644
--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -202,6 +202,46 @@ static int journal_submit_inode_data_buffers(struct address_space *mapping,
return ret;
}
+/* Send all the data buffers related to an inode */
+int jbd2_submit_inode_data(journal_t *journal, struct jbd2_inode *jinode)
+{
+ struct address_space *mapping;
+ loff_t dirty_start;
+ loff_t dirty_end;
+ int ret;
+
+ if (!jinode)
+ return 0;
+
+ dirty_start = jinode->i_dirty_start;
+ dirty_end = jinode->i_dirty_end;
+
+ if (!(jinode->i_flags & JI_WRITE_DATA))
+ return 0;
+
+ dirty_start = jinode->i_dirty_start;
+ dirty_end = jinode->i_dirty_end;
+
+ mapping = jinode->i_vfs_inode->i_mapping;
+
+ trace_jbd2_submit_inode_data(jinode->i_vfs_inode);
+ ret = journal_submit_inode_data_buffers(mapping, dirty_start,
+ dirty_end);
+
+ return ret;
+}
+EXPORT_SYMBOL(jbd2_submit_inode_data);
+
+int jbd2_wait_inode_data(journal_t *journal, struct jbd2_inode *jinode)
+{
+ if (!jinode || !(jinode->i_flags & JI_WAIT_DATA))
+ return 0;
+ return filemap_fdatawait_range_keep_errors(
+ jinode->i_vfs_inode->i_mapping, jinode->i_dirty_start,
+ jinode->i_dirty_end);
+}
+EXPORT_SYMBOL(jbd2_wait_inode_data);
+
/*
* Submit all the data buffers of inode associated with the transaction to
* disk.
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index d3897d155fb9..e4e0b55dd077 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -864,6 +864,82 @@ int jbd2_journal_next_log_block(journal_t *journal, unsigned long long *retp)
return jbd2_journal_bmap(journal, blocknr, retp);
}
+/* Map one fast commit buffer for use by the file system */
+int jbd2_map_fc_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;
+ journal_header_t *jhdr;
+
+ write_lock(&journal->j_state_lock);
+
+ if (journal->j_fc_off + journal->j_first_fc < journal->j_last_fc) {
+ fc_off = journal->j_fc_off;
+ blocknr = journal->j_first_fc + fc_off;
+ journal->j_fc_off++;
+ } else {
+ ret = -EINVAL;
+ }
+ write_unlock(&journal->j_state_lock);
+
+ 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;
+
+ lock_buffer(bh);
+ jhdr = (journal_header_t *)bh->b_data;
+ jhdr->h_magic = cpu_to_be32(JBD2_MAGIC_NUMBER);
+ jhdr->h_blocktype = cpu_to_be32(JBD2_FC_BLOCK);
+ jhdr->h_sequence = cpu_to_be32(journal->j_running_transaction->t_tid);
+
+ set_buffer_uptodate(bh);
+ unlock_buffer(bh);
+ journal->j_fc_wbuf[fc_off] = bh;
+
+ *bh_out = bh;
+
+ return 0;
+}
+EXPORT_SYMBOL(jbd2_map_fc_buf);
+
+/*
+ * Wait on fast commit buffers that were allocated by jbd2_map_fc_buf
+ * for completion.
+ */
+int jbd2_wait_on_fc_bufs(journal_t *journal, int num_blks)
+{
+ struct buffer_head *bh;
+ int i, j_fc_off;
+
+ read_lock(&journal->j_state_lock);
+ j_fc_off = journal->j_fc_off;
+ read_unlock(&journal->j_state_lock);
+
+ /*
+ * 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);
+ if (unlikely(!buffer_uptodate(bh)))
+ return -EIO;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(jbd2_wait_on_fc_bufs);
+
/*
* Conversion of logical to physical block numbers for the journal
*
diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
index 0a4d9d484528..599113bef67f 100644
--- a/include/linux/jbd2.h
+++ b/include/linux/jbd2.h
@@ -123,6 +123,7 @@ typedef struct journal_s journal_t; /* Journal control structure */
#define JBD2_SUPERBLOCK_V1 3
#define JBD2_SUPERBLOCK_V2 4
#define JBD2_REVOKE_BLOCK 5
+#define JBD2_FC_BLOCK 6
/*
* Standard header for all descriptor blocks:
@@ -1562,6 +1563,11 @@ int jbd2_start_async_fc_nowait(journal_t *journal, tid_t tid);
int jbd2_start_async_fc_wait(journal_t *journal, tid_t tid);
void jbd2_stop_async_fc(journal_t *journal, tid_t tid);
void jbd2_init_fast_commit(journal_t *journal, int num_fc_blks);
+int jbd2_map_fc_buf(journal_t *journal, struct buffer_head **bh_out);
+int jbd2_wait_on_fc_bufs(journal_t *journal, int num_blks);
+int jbd2_submit_inode_data(journal_t *journal, struct jbd2_inode *jinode);
+int jbd2_wait_inode_data(journal_t *journal, struct jbd2_inode *jinode);
+
/*
* is_journal_abort
*
--
2.25.1.481.gfbce0eb801-goog
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