#include <linux/buffer_head.h>
#include <linux/writeback.h>
#include <linux/crc32.h>
+#include <linux/backing-dev.h>
+#include <linux/slab.h>
#include "page.h"
#include "segbuf.h"
+struct nilfs_write_info {
+ struct the_nilfs *nilfs;
+ struct bio *bio;
+ int start, end; /* The region to be submitted */
+ int rest_blocks;
+ int max_pages;
+ int nr_vecs;
+ sector_t blocknr;
+};
+
+
+static int nilfs_segbuf_write(struct nilfs_segment_buffer *segbuf,
+ struct the_nilfs *nilfs);
+static int nilfs_segbuf_wait(struct nilfs_segment_buffer *segbuf);
+
+
static struct kmem_cache *nilfs_segbuf_cachep;
static void nilfs_segbuf_init_once(void *obj)
INIT_LIST_HEAD(&segbuf->sb_list);
INIT_LIST_HEAD(&segbuf->sb_segsum_buffers);
INIT_LIST_HEAD(&segbuf->sb_payload_buffers);
+
+ init_completion(&segbuf->sb_bio_event);
+ atomic_set(&segbuf->sb_err, 0);
+ segbuf->sb_nbio = 0;
+
return segbuf;
}
segbuf->sb_fseg_end - segbuf->sb_pseg_start + 1;
}
+/**
+ * nilfs_segbuf_map_cont - map a new log behind a given log
+ * @segbuf: new segment buffer
+ * @prev: segment buffer containing a log to be continued
+ */
+void nilfs_segbuf_map_cont(struct nilfs_segment_buffer *segbuf,
+ struct nilfs_segment_buffer *prev)
+{
+ segbuf->sb_segnum = prev->sb_segnum;
+ segbuf->sb_fseg_start = prev->sb_fseg_start;
+ segbuf->sb_fseg_end = prev->sb_fseg_end;
+ segbuf->sb_pseg_start = prev->sb_pseg_start + prev->sb_sum.nblocks;
+ segbuf->sb_rest_blocks =
+ segbuf->sb_fseg_end - segbuf->sb_pseg_start + 1;
+}
+
void nilfs_segbuf_set_next_segnum(struct nilfs_segment_buffer *segbuf,
__u64 nextnum, struct the_nilfs *nilfs)
{
segbuf->sb_sum.sumbytes = sizeof(struct nilfs_segment_summary);
segbuf->sb_sum.nfinfo = segbuf->sb_sum.nfileblk = 0;
segbuf->sb_sum.ctime = ctime;
-
- segbuf->sb_io_error = 0;
return 0;
}
/*
- * Setup segument summary
+ * Setup segment summary
*/
void nilfs_segbuf_fill_in_segsum(struct nilfs_segment_buffer *segbuf)
{
raw_sum->ss_datasum = cpu_to_le32(crc);
}
-void nilfs_release_buffers(struct list_head *list)
+static void nilfs_release_buffers(struct list_head *list)
{
struct buffer_head *bh, *n;
}
}
+static void nilfs_segbuf_clear(struct nilfs_segment_buffer *segbuf)
+{
+ nilfs_release_buffers(&segbuf->sb_segsum_buffers);
+ nilfs_release_buffers(&segbuf->sb_payload_buffers);
+}
+
+/*
+ * Iterators for segment buffers
+ */
+void nilfs_clear_logs(struct list_head *logs)
+{
+ struct nilfs_segment_buffer *segbuf;
+
+ list_for_each_entry(segbuf, logs, sb_list)
+ nilfs_segbuf_clear(segbuf);
+}
+
+void nilfs_truncate_logs(struct list_head *logs,
+ struct nilfs_segment_buffer *last)
+{
+ struct nilfs_segment_buffer *n, *segbuf;
+
+ segbuf = list_prepare_entry(last, logs, sb_list);
+ list_for_each_entry_safe_continue(segbuf, n, logs, sb_list) {
+ list_del_init(&segbuf->sb_list);
+ nilfs_segbuf_clear(segbuf);
+ nilfs_segbuf_free(segbuf);
+ }
+}
+
+int nilfs_write_logs(struct list_head *logs, struct the_nilfs *nilfs)
+{
+ struct nilfs_segment_buffer *segbuf;
+ int ret = 0;
+
+ list_for_each_entry(segbuf, logs, sb_list) {
+ ret = nilfs_segbuf_write(segbuf, nilfs);
+ if (ret)
+ break;
+ }
+ return ret;
+}
+
+int nilfs_wait_on_logs(struct list_head *logs)
+{
+ struct nilfs_segment_buffer *segbuf;
+ int err, ret = 0;
+
+ list_for_each_entry(segbuf, logs, sb_list) {
+ err = nilfs_segbuf_wait(segbuf);
+ if (err && !ret)
+ ret = err;
+ }
+ return ret;
+}
+
/*
* BIO operations
*/
static void nilfs_end_bio_write(struct bio *bio, int err)
{
const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
- struct nilfs_write_info *wi = bio->bi_private;
+ struct nilfs_segment_buffer *segbuf = bio->bi_private;
if (err == -EOPNOTSUPP) {
set_bit(BIO_EOPNOTSUPP, &bio->bi_flags);
}
if (!uptodate)
- atomic_inc(&wi->err);
+ atomic_inc(&segbuf->sb_err);
bio_put(bio);
- complete(&wi->bio_event);
+ complete(&segbuf->sb_bio_event);
}
-static int nilfs_submit_seg_bio(struct nilfs_write_info *wi, int mode)
+static int nilfs_segbuf_submit_bio(struct nilfs_segment_buffer *segbuf,
+ struct nilfs_write_info *wi, int mode)
{
struct bio *bio = wi->bio;
int err;
- if (wi->nbio > 0 && bdi_write_congested(wi->bdi)) {
- wait_for_completion(&wi->bio_event);
- wi->nbio--;
- if (unlikely(atomic_read(&wi->err))) {
+ if (segbuf->sb_nbio > 0 && bdi_write_congested(wi->nilfs->ns_bdi)) {
+ wait_for_completion(&segbuf->sb_bio_event);
+ segbuf->sb_nbio--;
+ if (unlikely(atomic_read(&segbuf->sb_err))) {
bio_put(bio);
err = -EIO;
goto failed;
}
bio->bi_end_io = nilfs_end_bio_write;
- bio->bi_private = wi;
+ bio->bi_private = segbuf;
bio_get(bio);
submit_bio(mode, bio);
if (bio_flagged(bio, BIO_EOPNOTSUPP)) {
err = -EOPNOTSUPP;
goto failed;
}
- wi->nbio++;
+ segbuf->sb_nbio++;
bio_put(bio);
wi->bio = NULL;
}
/**
- * nilfs_alloc_seg_bio - allocate a bio for writing segment.
- * @sb: super block
- * @start: beginning disk block number of this BIO.
+ * nilfs_alloc_seg_bio - allocate a new bio for writing log
+ * @nilfs: nilfs object
+ * @start: start block number of the bio
* @nr_vecs: request size of page vector.
*
- * alloc_seg_bio() allocates a new BIO structure and initialize it.
- *
* Return Value: On success, pointer to the struct bio is returned.
* On error, NULL is returned.
*/
-static struct bio *nilfs_alloc_seg_bio(struct super_block *sb, sector_t start,
+static struct bio *nilfs_alloc_seg_bio(struct the_nilfs *nilfs, sector_t start,
int nr_vecs)
{
struct bio *bio;
- bio = bio_alloc(GFP_NOWAIT, nr_vecs);
+ bio = bio_alloc(GFP_NOIO, nr_vecs);
if (bio == NULL) {
while (!bio && (nr_vecs >>= 1))
- bio = bio_alloc(GFP_NOWAIT, nr_vecs);
+ bio = bio_alloc(GFP_NOIO, nr_vecs);
}
if (likely(bio)) {
- bio->bi_bdev = sb->s_bdev;
- bio->bi_sector = (sector_t)start << (sb->s_blocksize_bits - 9);
+ bio->bi_bdev = nilfs->ns_bdev;
+ bio->bi_sector = start << (nilfs->ns_blocksize_bits - 9);
}
return bio;
}
-void nilfs_segbuf_prepare_write(struct nilfs_segment_buffer *segbuf,
- struct nilfs_write_info *wi)
+static void nilfs_segbuf_prepare_write(struct nilfs_segment_buffer *segbuf,
+ struct nilfs_write_info *wi)
{
wi->bio = NULL;
wi->rest_blocks = segbuf->sb_sum.nblocks;
- wi->max_pages = bio_get_nr_vecs(wi->sb->s_bdev);
+ wi->max_pages = bio_get_nr_vecs(wi->nilfs->ns_bdev);
wi->nr_vecs = min(wi->max_pages, wi->rest_blocks);
wi->start = wi->end = 0;
- wi->nbio = 0;
wi->blocknr = segbuf->sb_pseg_start;
-
- atomic_set(&wi->err, 0);
- init_completion(&wi->bio_event);
}
-static int nilfs_submit_bh(struct nilfs_write_info *wi, struct buffer_head *bh,
- int mode)
+static int nilfs_segbuf_submit_bh(struct nilfs_segment_buffer *segbuf,
+ struct nilfs_write_info *wi,
+ struct buffer_head *bh, int mode)
{
int len, err;
BUG_ON(wi->nr_vecs <= 0);
repeat:
if (!wi->bio) {
- wi->bio = nilfs_alloc_seg_bio(wi->sb, wi->blocknr + wi->end,
+ wi->bio = nilfs_alloc_seg_bio(wi->nilfs, wi->blocknr + wi->end,
wi->nr_vecs);
if (unlikely(!wi->bio))
return -ENOMEM;
return 0;
}
/* bio is FULL */
- err = nilfs_submit_seg_bio(wi, mode);
+ err = nilfs_segbuf_submit_bio(segbuf, wi, mode);
/* never submit current bh */
if (likely(!err))
goto repeat;
return err;
}
-int nilfs_segbuf_write(struct nilfs_segment_buffer *segbuf,
- struct nilfs_write_info *wi)
+/**
+ * nilfs_segbuf_write - submit write requests of a log
+ * @segbuf: buffer storing a log to be written
+ * @nilfs: nilfs object
+ *
+ * Return Value: On Success, 0 is returned. On Error, one of the following
+ * negative error code is returned.
+ *
+ * %-EIO - I/O error
+ *
+ * %-ENOMEM - Insufficient memory available.
+ */
+static int nilfs_segbuf_write(struct nilfs_segment_buffer *segbuf,
+ struct the_nilfs *nilfs)
{
+ struct nilfs_write_info wi;
struct buffer_head *bh;
- int res, rw = WRITE;
+ int res = 0, rw = WRITE;
+
+ wi.nilfs = nilfs;
+ nilfs_segbuf_prepare_write(segbuf, &wi);
list_for_each_entry(bh, &segbuf->sb_segsum_buffers, b_assoc_buffers) {
- res = nilfs_submit_bh(wi, bh, rw);
+ res = nilfs_segbuf_submit_bh(segbuf, &wi, bh, rw);
if (unlikely(res))
goto failed_bio;
}
list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) {
- res = nilfs_submit_bh(wi, bh, rw);
+ res = nilfs_segbuf_submit_bh(segbuf, &wi, bh, rw);
if (unlikely(res))
goto failed_bio;
}
- if (wi->bio) {
+ if (wi.bio) {
/*
* Last BIO is always sent through the following
* submission.
*/
- rw |= (1 << BIO_RW_SYNCIO);
- res = nilfs_submit_seg_bio(wi, rw);
- if (unlikely(res))
- goto failed_bio;
+ rw |= (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG);
+ res = nilfs_segbuf_submit_bio(segbuf, &wi, rw);
}
- res = 0;
- out:
- return res;
-
failed_bio:
- atomic_inc(&wi->err);
- goto out;
+ return res;
}
/**
* nilfs_segbuf_wait - wait for completion of requested BIOs
- * @wi: nilfs_write_info
+ * @segbuf: segment buffer
*
* Return Value: On Success, 0 is returned. On Error, one of the following
* negative error code is returned.
*
* %-EIO - I/O error
*/
-int nilfs_segbuf_wait(struct nilfs_segment_buffer *segbuf,
- struct nilfs_write_info *wi)
+static int nilfs_segbuf_wait(struct nilfs_segment_buffer *segbuf)
{
int err = 0;
- if (!wi->nbio)
+ if (!segbuf->sb_nbio)
return 0;
do {
- wait_for_completion(&wi->bio_event);
- } while (--wi->nbio > 0);
+ wait_for_completion(&segbuf->sb_bio_event);
+ } while (--segbuf->sb_nbio > 0);
- if (unlikely(atomic_read(&wi->err) > 0)) {
+ if (unlikely(atomic_read(&segbuf->sb_err) > 0)) {
printk(KERN_ERR "NILFS: IO error writing segment\n");
err = -EIO;
- segbuf->sb_io_error = 1;
}
return err;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff