Commit f30bf3e4 authored by Ryusuke Konishi's avatar Ryusuke Konishi Committed by Linus Torvalds
Browse files

nilfs2: fix missed-sync issue for do_sync_mapping_range() 



Chris Mason pointed out that there is a missed sync issue in
nilfs_writepages():

On Wed, 17 Dec 2008 21:52:55 -0500, Chris Mason wrote:
> It looks like nilfs_writepage ignores WB_SYNC_NONE, which is used by
> do_sync_mapping_range().

where WB_SYNC_NONE in do_sync_mapping_range() was replaced with
WB_SYNC_ALL by Nick's patch (commit:
ee53a891).

This fixes the problem by letting nilfs_writepages() write out the log of
file data within the range if sync_mode is WB_SYNC_ALL.

This involves removal of nilfs_file_aio_write() which was previously
needed to ensure O_SYNC sync writes.

Cc: Chris Mason <chris.mason@oracle.com>
Signed-off-by: default avatarRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 9ff05123

fs/nilfs2/file.c

+3 −24
Original line number Diff line number Diff line
@@ -44,35 +44,14 @@ int nilfs_sync_file(struct file *file, struct dentry *dentry, int datasync) 
		return 0;



	if (datasync)

		err = nilfs_construct_dsync_segment(inode->i_sb, inode);

		err = nilfs_construct_dsync_segment(inode->i_sb, inode, 0,

						    LLONG_MAX);

	else

		err = nilfs_construct_segment(inode->i_sb);



	return err;

}



static ssize_t

nilfs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,

		     unsigned long nr_segs, loff_t pos)

{

	struct file *file = iocb->ki_filp;

	struct inode *inode = file->f_dentry->d_inode;

	ssize_t ret;



	ret = generic_file_aio_write(iocb, iov, nr_segs, pos);

	if (ret <= 0)

		return ret;



	if ((file->f_flags & O_SYNC) || IS_SYNC(inode)) {

		int err;



		err = nilfs_construct_dsync_segment(inode->i_sb, inode);

		if (unlikely(err))

			return err;

	}

	return ret;

}



static int nilfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)

{

	struct page *page = vmf->page;
@@ -160,7 +139,7 @@ struct file_operations nilfs_file_operations = { 
	.read		= do_sync_read,

	.write		= do_sync_write,

	.aio_read	= generic_file_aio_read,

	.aio_write	= nilfs_file_aio_write,

	.aio_write	= generic_file_aio_write,

	.ioctl		= nilfs_ioctl,

#ifdef CONFIG_COMPAT

	.compat_ioctl	= nilfs_compat_ioctl,

fs/nilfs2/inode.c

+9 −7
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ 
#include <linux/buffer_head.h>

#include <linux/mpage.h>

#include <linux/writeback.h>

#include <linux/uio.h>

#include "nilfs.h"

#include "segment.h"

#include "page.h"
@@ -145,8 +146,14 @@ static int nilfs_readpages(struct file *file, struct address_space *mapping, 
static int nilfs_writepages(struct address_space *mapping,

			    struct writeback_control *wbc)

{

	/* This empty method is required not to call generic_writepages() */

	return 0;

	struct inode *inode = mapping->host;

	int err = 0;



	if (wbc->sync_mode == WB_SYNC_ALL)

		err = nilfs_construct_dsync_segment(inode->i_sb, inode,

						    wbc->range_start,

						    wbc->range_end);

	return err;

}



static int nilfs_writepage(struct page *page, struct writeback_control *wbc)
@@ -225,11 +232,6 @@ nilfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov, 
	struct file *file = iocb->ki_filp;

	struct inode *inode = file->f_mapping->host;

	ssize_t size;

	int err;



	err = nilfs_construct_dsync_segment(inode->i_sb, inode);

	if (unlikely(err))

		return err;



	if (rw == WRITE)

		return 0;

fs/nilfs2/segment.c

+72 −48
Original line number Diff line number Diff line
@@ -654,29 +654,41 @@ struct nilfs_sc_operations nilfs_sc_dsync_ops = { 
	.write_node_binfo = NULL,

};



static int nilfs_lookup_dirty_data_buffers(struct inode *inode,

static size_t nilfs_lookup_dirty_data_buffers(struct inode *inode,

					      struct list_head *listp,

					   struct nilfs_sc_info *sci)

					      size_t nlimit,

					      loff_t start, loff_t end)

{

	struct nilfs_segment_buffer *segbuf = sci->sc_curseg;

	struct address_space *mapping = inode->i_mapping;

	struct pagevec pvec;

	unsigned i, ndirties = 0, nlimit;

	pgoff_t index = 0;

	int err = 0;

	pgoff_t index = 0, last = ULONG_MAX;

	size_t ndirties = 0;

	int i;



	nlimit = sci->sc_segbuf_nblocks -

		(sci->sc_nblk_this_inc + segbuf->sb_sum.nblocks);

	if (unlikely(start != 0 || end != LLONG_MAX)) {

		/*

		 * A valid range is given for sync-ing data pages. The

		 * range is rounded to per-page; extra dirty buffers

		 * may be included if blocksize < pagesize.

		 */

		index = start >> PAGE_SHIFT;

		last = end >> PAGE_SHIFT;

	}

	pagevec_init(&pvec, 0);

 repeat:

	if (!pagevec_lookup_tag(&pvec, mapping, &index, PAGECACHE_TAG_DIRTY,

				PAGEVEC_SIZE))

		return 0;

	if (unlikely(index > last) ||

	    !pagevec_lookup_tag(&pvec, mapping, &index, PAGECACHE_TAG_DIRTY,

				min_t(pgoff_t, last - index,

				      PAGEVEC_SIZE - 1) + 1))

		return ndirties;



	for (i = 0; i < pagevec_count(&pvec); i++) {

		struct buffer_head *bh, *head;

		struct page *page = pvec.pages[i];



		if (unlikely(page->index > last))

			break;



		if (mapping->host) {

			lock_page(page);

			if (!page_has_buffers(page))
@@ -687,24 +699,21 @@ static int nilfs_lookup_dirty_data_buffers(struct inode *inode, 


		bh = head = page_buffers(page);

		do {

			if (buffer_dirty(bh)) {

				if (ndirties > nlimit) {

					err = -E2BIG;

					break;

				}

			if (!buffer_dirty(bh))

				continue;

			get_bh(bh);

			list_add_tail(&bh->b_assoc_buffers, listp);

			ndirties++;

			if (unlikely(ndirties >= nlimit)) {

				pagevec_release(&pvec);

				cond_resched();

				return ndirties;

			}

			bh = bh->b_this_page;

		} while (bh != head);

		} while (bh = bh->b_this_page, bh != head);

	}

	pagevec_release(&pvec);

	cond_resched();



	if (!err)

	goto repeat;

	return err;

}



static void nilfs_lookup_dirty_node_buffers(struct inode *inode,
@@ -1058,23 +1067,31 @@ static int nilfs_segctor_apply_buffers(struct nilfs_sc_info *sci, 
	return err;

}



static size_t nilfs_segctor_buffer_rest(struct nilfs_sc_info *sci)

{

	/* Remaining number of blocks within segment buffer */

	return sci->sc_segbuf_nblocks -

		(sci->sc_nblk_this_inc + sci->sc_curseg->sb_sum.nblocks);

}



static int nilfs_segctor_scan_file(struct nilfs_sc_info *sci,

				   struct inode *inode,

				   struct nilfs_sc_operations *sc_ops)

{

	LIST_HEAD(data_buffers);

	LIST_HEAD(node_buffers);

	int err, err2;

	int err;



	if (!(sci->sc_stage.flags & NILFS_CF_NODE)) {

		err = nilfs_lookup_dirty_data_buffers(inode, &data_buffers,

						      sci);

		if (err) {

			err2 = nilfs_segctor_apply_buffers(

		size_t n, rest = nilfs_segctor_buffer_rest(sci);



		n = nilfs_lookup_dirty_data_buffers(

			inode, &data_buffers, rest + 1, 0, LLONG_MAX);

		if (n > rest) {

			err = nilfs_segctor_apply_buffers(

				sci, inode, &data_buffers,

				err == -E2BIG ? sc_ops->collect_data : NULL);

			if (err == -E2BIG)

				err = err2;

				sc_ops->collect_data);

			BUG_ON(!err); /* always receive -E2BIG or true error */

			goto break_or_fail;

		}

	}
@@ -1114,16 +1131,20 @@ static int nilfs_segctor_scan_file_dsync(struct nilfs_sc_info *sci, 
					 struct inode *inode)

{

	LIST_HEAD(data_buffers);

	int err, err2;

	size_t n, rest = nilfs_segctor_buffer_rest(sci);

	int err;



	err = nilfs_lookup_dirty_data_buffers(inode, &data_buffers, sci);

	err2 = nilfs_segctor_apply_buffers(sci, inode, &data_buffers,

					   (!err || err == -E2BIG) ?

					   nilfs_collect_file_data : NULL);

	if (err == -E2BIG)

		err = err2;

	if (!err)

	n = nilfs_lookup_dirty_data_buffers(inode, &data_buffers, rest + 1,

					    sci->sc_dsync_start,

					    sci->sc_dsync_end);



	err = nilfs_segctor_apply_buffers(sci, inode, &data_buffers,

					  nilfs_collect_file_data);

	if (!err) {

		nilfs_segctor_end_finfo(sci, inode);

		BUG_ON(n > rest);

		/* always receive -E2BIG or true error if n > rest */

	}

	return err;

}
@@ -1276,14 +1297,13 @@ static int nilfs_segctor_collect_blocks(struct nilfs_sc_info *sci, int mode) 
	case NILFS_ST_DSYNC:

 dsync_mode:

		sci->sc_curseg->sb_sum.flags |= NILFS_SS_SYNDT;

		ii = sci->sc_stage.dirty_file_ptr;

		ii = sci->sc_dsync_inode;

		if (!test_bit(NILFS_I_BUSY, &ii->i_state))

			break;



		err = nilfs_segctor_scan_file_dsync(sci, &ii->vfs_inode);

		if (unlikely(err))

			break;

		sci->sc_stage.dirty_file_ptr = NULL;

		sci->sc_curseg->sb_sum.flags |= NILFS_SS_LOGEND;

		sci->sc_stage.scnt = NILFS_ST_DONE;

		return 0;
@@ -2624,7 +2644,9 @@ int nilfs_construct_segment(struct super_block *sb) 
/**

 * nilfs_construct_dsync_segment - construct a data-only logical segment

 * @sb: super block

 * @inode: the inode whose data blocks should be written out

 * @inode: inode whose data blocks should be written out

 * @start: start byte offset

 * @end: end byte offset (inclusive)

 *

 * Return Value: On success, 0 is retured. On errors, one of the following

 * negative error code is returned.
@@ -2639,8 +2661,8 @@ int nilfs_construct_segment(struct super_block *sb) 
 *

 * %-ENOMEM - Insufficient memory available.

 */

int nilfs_construct_dsync_segment(struct super_block *sb,

				  struct inode *inode)

int nilfs_construct_dsync_segment(struct super_block *sb, struct inode *inode,

				  loff_t start, loff_t end)

{

	struct nilfs_sb_info *sbi = NILFS_SB(sb);

	struct nilfs_sc_info *sci = NILFS_SC(sbi);
@@ -2671,7 +2693,9 @@ int nilfs_construct_dsync_segment(struct super_block *sb, 
		return 0;

	}

	spin_unlock(&sbi->s_inode_lock);

	sci->sc_stage.dirty_file_ptr = ii;

	sci->sc_dsync_inode = ii;

	sci->sc_dsync_start = start;

	sci->sc_dsync_end = end;



	err = nilfs_segctor_do_construct(sci, SC_LSEG_DSYNC);

fs/nilfs2/segment.h

+9 −2
Original line number Diff line number Diff line
@@ -93,6 +93,9 @@ struct nilfs_segsum_pointer { 
 * @sc_active_segments: List of active segments that were already written out

 * @sc_cleaning_segments: List of segments to be freed through construction

 * @sc_copied_buffers: List of copied buffers (buffer heads) to freeze data

 * @sc_dsync_inode: inode whose data pages are written for a sync operation

 * @sc_dsync_start: start byte offset of data pages

 * @sc_dsync_end: end byte offset of data pages (inclusive)

 * @sc_segbufs: List of segment buffers

 * @sc_segbuf_nblocks: Number of available blocks in segment buffers.

 * @sc_curseg: Current segment buffer
@@ -134,6 +137,10 @@ struct nilfs_sc_info { 
	struct list_head	sc_cleaning_segments;

	struct list_head	sc_copied_buffers;



	struct nilfs_inode_info *sc_dsync_inode;

	loff_t			sc_dsync_start;

	loff_t			sc_dsync_end;



	/* Segment buffers */

	struct list_head	sc_segbufs;

	unsigned long		sc_segbuf_nblocks;
@@ -221,8 +228,8 @@ extern void nilfs_destroy_transaction_cache(void); 
extern void nilfs_relax_pressure_in_lock(struct super_block *);



extern int nilfs_construct_segment(struct super_block *);

extern int nilfs_construct_dsync_segment(struct super_block *,

					 struct inode *);

extern int nilfs_construct_dsync_segment(struct super_block *, struct inode *,

					 loff_t, loff_t);

extern void nilfs_flush_segment(struct super_block *, ino_t);

extern int nilfs_clean_segments(struct super_block *, void __user *);

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