nilfs2: move pointer to super root block into logs
This moves a pointer to buffer storing super root block to each log
buffer from nilfs_sc_info struct for simplicity.
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
diff --git a/fs/nilfs2/segbuf.c b/fs/nilfs2/segbuf.c
index 17851f7..a24ca9c 100644
--- a/fs/nilfs2/segbuf.c
+++ b/fs/nilfs2/segbuf.c
@@ -81,6 +81,7 @@
INIT_LIST_HEAD(&segbuf->sb_list);
INIT_LIST_HEAD(&segbuf->sb_segsum_buffers);
INIT_LIST_HEAD(&segbuf->sb_payload_buffers);
+ segbuf->sb_super_root = NULL;
init_completion(&segbuf->sb_bio_event);
atomic_set(&segbuf->sb_err, 0);
@@ -282,6 +283,7 @@
{
nilfs_release_buffers(&segbuf->sb_segsum_buffers);
nilfs_release_buffers(&segbuf->sb_payload_buffers);
+ segbuf->sb_super_root = NULL;
}
/*
diff --git a/fs/nilfs2/segbuf.h b/fs/nilfs2/segbuf.h
index 94dfd35..a1a0af6 100644
--- a/fs/nilfs2/segbuf.h
+++ b/fs/nilfs2/segbuf.h
@@ -76,6 +76,7 @@
* @sb_rest_blocks: Number of residual blocks in the current segment
* @sb_segsum_buffers: List of buffers for segment summaries
* @sb_payload_buffers: List of buffers for segment payload
+ * @sb_super_root: Pointer to buffer storing a super root block (if exists)
* @sb_nbio: Number of flying bio requests
* @sb_err: I/O error status
* @sb_bio_event: Completion event of log writing
@@ -95,6 +96,7 @@
/* Buffers */
struct list_head sb_segsum_buffers;
struct list_head sb_payload_buffers; /* including super root */
+ struct buffer_head *sb_super_root;
/* io status */
int sb_nbio;
diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
index 6a7dbd8..7ab0270 100644
--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -435,7 +435,7 @@
return err;
segbuf = sci->sc_curseg;
}
- err = nilfs_segbuf_extend_payload(segbuf, &sci->sc_super_root);
+ err = nilfs_segbuf_extend_payload(segbuf, &segbuf->sb_super_root);
if (likely(!err))
segbuf->sb_sum.flags |= NILFS_SS_SR;
return err;
@@ -952,10 +952,10 @@
{
struct nilfs_segment_buffer *segbuf;
- if (sci->sc_super_root)
- nilfs_fill_in_super_root_crc(sci->sc_super_root, seed);
-
list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) {
+ if (segbuf->sb_super_root)
+ nilfs_fill_in_super_root_crc(segbuf->sb_super_root,
+ seed);
nilfs_segbuf_fill_in_segsum_crc(segbuf, seed);
nilfs_segbuf_fill_in_data_crc(segbuf, seed);
}
@@ -964,11 +964,13 @@
static void nilfs_segctor_fill_in_super_root(struct nilfs_sc_info *sci,
struct the_nilfs *nilfs)
{
- struct buffer_head *bh_sr = sci->sc_super_root;
- struct nilfs_super_root *raw_sr =
- (struct nilfs_super_root *)bh_sr->b_data;
+ struct buffer_head *bh_sr;
+ struct nilfs_super_root *raw_sr;
unsigned isz = nilfs->ns_inode_size;
+ bh_sr = NILFS_LAST_SEGBUF(&sci->sc_segbufs)->sb_super_root;
+ raw_sr = (struct nilfs_super_root *)bh_sr->b_data;
+
raw_sr->sr_bytes = cpu_to_le16(NILFS_SR_BYTES);
raw_sr->sr_nongc_ctime
= cpu_to_le64(nilfs_doing_gc() ?
@@ -1491,7 +1493,6 @@
/* Collection retry loop */
for (;;) {
- sci->sc_super_root = NULL;
sci->sc_nblk_this_inc = 0;
sci->sc_curseg = NILFS_FIRST_SEGBUF(&sci->sc_segbufs);
@@ -1568,7 +1569,7 @@
ssp.offset = sizeof(struct nilfs_segment_summary);
list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) {
- if (bh == sci->sc_super_root)
+ if (bh == segbuf->sb_super_root)
break;
if (!finfo) {
finfo = nilfs_segctor_map_segsum_entry(
@@ -1729,7 +1730,7 @@
list_for_each_entry(bh, &segbuf->sb_payload_buffers,
b_assoc_buffers) {
- if (bh == sci->sc_super_root) {
+ if (bh == segbuf->sb_super_root) {
if (bh->b_page != bd_page) {
lock_page(bd_page);
clear_page_dirty_for_io(bd_page);
@@ -1848,7 +1849,7 @@
}
static void nilfs_abort_logs(struct list_head *logs, struct page *failed_page,
- struct buffer_head *bh_sr, int err)
+ int err)
{
struct nilfs_segment_buffer *segbuf;
struct page *bd_page = NULL, *fs_page = NULL;
@@ -1869,7 +1870,7 @@
list_for_each_entry(bh, &segbuf->sb_payload_buffers,
b_assoc_buffers) {
- if (bh == bh_sr) {
+ if (bh == segbuf->sb_super_root) {
if (bh->b_page != bd_page) {
end_page_writeback(bd_page);
bd_page = bh->b_page;
@@ -1898,7 +1899,7 @@
list_splice_tail_init(&sci->sc_write_logs, &logs);
ret = nilfs_wait_on_logs(&logs);
- nilfs_abort_logs(&logs, NULL, sci->sc_super_root, ret ? : err);
+ nilfs_abort_logs(&logs, NULL, ret ? : err);
list_splice_tail_init(&sci->sc_segbufs, &logs);
nilfs_cancel_segusage(&logs, nilfs->ns_sufile);
@@ -1914,7 +1915,6 @@
}
nilfs_destroy_logs(&logs);
- sci->sc_super_root = NULL;
}
static void nilfs_set_next_segment(struct the_nilfs *nilfs,
@@ -1933,7 +1933,7 @@
struct nilfs_segment_buffer *segbuf;
struct page *bd_page = NULL, *fs_page = NULL;
struct the_nilfs *nilfs = sci->sc_sbi->s_nilfs;
- int update_sr = (sci->sc_super_root != NULL);
+ int update_sr = false;
list_for_each_entry(segbuf, &sci->sc_write_logs, sb_list) {
struct buffer_head *bh;
@@ -1964,11 +1964,12 @@
set_buffer_uptodate(bh);
clear_buffer_dirty(bh);
clear_buffer_nilfs_volatile(bh);
- if (bh == sci->sc_super_root) {
+ if (bh == segbuf->sb_super_root) {
if (bh->b_page != bd_page) {
end_page_writeback(bd_page);
bd_page = bh->b_page;
}
+ update_sr = true;
break;
}
if (bh->b_page != fs_page) {
@@ -2115,7 +2116,7 @@
struct nilfs_sb_info *sbi = sci->sc_sbi;
struct the_nilfs *nilfs = sbi->s_nilfs;
struct page *failed_page;
- int err, has_sr = 0;
+ int err;
sci->sc_stage.scnt = NILFS_ST_INIT;
@@ -2143,8 +2144,6 @@
if (unlikely(err))
goto failed;
- has_sr = (sci->sc_super_root != NULL);
-
/* Avoid empty segment */
if (sci->sc_stage.scnt == NILFS_ST_DONE &&
NILFS_SEG_EMPTY(&sci->sc_curseg->sb_sum)) {
@@ -2159,7 +2158,8 @@
if (sci->sc_stage.flags & NILFS_CF_IFILE_STARTED)
nilfs_segctor_fill_in_file_bmap(sci, sbi->s_ifile);
- if (has_sr) {
+ if (mode == SC_LSEG_SR &&
+ sci->sc_stage.scnt >= NILFS_ST_CPFILE) {
err = nilfs_segctor_fill_in_checkpoint(sci);
if (unlikely(err))
goto failed_to_write;
@@ -2171,8 +2171,7 @@
/* Write partial segments */
err = nilfs_segctor_prepare_write(sci, &failed_page);
if (err) {
- nilfs_abort_logs(&sci->sc_segbufs, failed_page,
- sci->sc_super_root, err);
+ nilfs_abort_logs(&sci->sc_segbufs, failed_page, err);
goto failed_to_write;
}
nilfs_segctor_fill_in_checksums(sci, nilfs->ns_crc_seed);
@@ -2196,8 +2195,6 @@
}
} while (sci->sc_stage.scnt != NILFS_ST_DONE);
- sci->sc_super_root = NULL;
-
out:
nilfs_segctor_check_out_files(sci, sbi);
return err;
diff --git a/fs/nilfs2/segment.h b/fs/nilfs2/segment.h
index 82dfd6a..e61fc79 100644
--- a/fs/nilfs2/segment.h
+++ b/fs/nilfs2/segment.h
@@ -100,7 +100,6 @@
* @sc_write_logs: List of segment buffers to hold logs under writing
* @sc_segbuf_nblocks: Number of available blocks in segment buffers.
* @sc_curseg: Current segment buffer
- * @sc_super_root: Pointer to the super root buffer
* @sc_stage: Collection stage
* @sc_finfo_ptr: pointer to the current finfo struct in the segment summary
* @sc_binfo_ptr: pointer to the current binfo struct in the segment summary
@@ -148,7 +147,6 @@
struct list_head sc_write_logs;
unsigned long sc_segbuf_nblocks;
struct nilfs_segment_buffer *sc_curseg;
- struct buffer_head *sc_super_root;
struct nilfs_cstage sc_stage;