[PATCH 0/4] implement optimized fdatasync

[PATCH 0/4] implement optimized fdatasync

[Christoph Hellwig]

This series implements a real fdatasync, that is one that is not
simply identical to fdatasync, but one that skips logging the inode
if there are only timestamp updates.

In fact the first three patches are just broad cleanups to get the
code into shape for the rather small patch 4 implementing the optimization.

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[PATCH 1/4] [PATCH 1/4] xfs: merge xfs_lrw.c into xfs_file.c

[Christoph Hellwig]

[-- Attachment #1: xfs-kill-xfs_lrw-dot-c --]
[-- Type: text/plain, Size: 43928 bytes --]

Currently the code to implement the file operations is split over two small
files.  Merge the content of xfs_lrw.c into xfs_file.c to have it in one
place.  Note that I haven't done various cleanups that are possible after
this yet, they will follow in the next patch.  Also the function 
xfs_dev_is_read_only which was in xfs_lrw.c before really doesn't fit in
here at all and was moved to xfs_mount.c.

Signed-off-by: Christoph Hellwig <hch@lst.de>

Index: xfs/fs/xfs/Makefile
===================================================================
--- xfs.orig/fs/xfs/Makefile	2010-02-13 22:54:22.756254098 +0100
+++ xfs/fs/xfs/Makefile	2010-02-13 22:54:25.908270580 +0100
@@ -105,7 +105,6 @@ xfs-y				+= $(addprefix $(XFS_LINUX)/, \
 				   xfs_globals.o \
 				   xfs_ioctl.o \
 				   xfs_iops.o \
-				   xfs_lrw.o \
 				   xfs_super.o \
 				   xfs_sync.o \
 				   xfs_xattr.o)
Index: xfs/fs/xfs/linux-2.6/xfs_file.c
===================================================================
--- xfs.orig/fs/xfs/linux-2.6/xfs_file.c	2010-02-13 22:51:38.134254237 +0100
+++ xfs/fs/xfs/linux-2.6/xfs_file.c	2010-02-13 23:01:49.075025713 +0100
@@ -16,6 +16,7 @@
  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */
 #include "xfs.h"
+#include "xfs_fs.h"
 #include "xfs_bit.h"
 #include "xfs_log.h"
 #include "xfs_inum.h"
@@ -34,16 +35,738 @@
 #include "xfs_dir2_sf.h"
 #include "xfs_dinode.h"
 #include "xfs_inode.h"
+#include "xfs_bmap.h"
 #include "xfs_error.h"
 #include "xfs_rw.h"
 #include "xfs_vnodeops.h"
 #include "xfs_da_btree.h"
 #include "xfs_ioctl.h"
+#include "xfs_trace.h"
 
 #include <linux/dcache.h>
 
 static const struct vm_operations_struct xfs_file_vm_ops;
 
+/*
+ *	xfs_iozero
+ *
+ *	xfs_iozero clears the specified range of buffer supplied,
+ *	and marks all the affected blocks as valid and modified.  If
+ *	an affected block is not allocated, it will be allocated.  If
+ *	an affected block is not completely overwritten, and is not
+ *	valid before the operation, it will be read from disk before
+ *	being partially zeroed.
+ */
+STATIC int
+xfs_iozero(
+	struct xfs_inode	*ip,	/* inode			*/
+	loff_t			pos,	/* offset in file		*/
+	size_t			count)	/* size of data to zero		*/
+{
+	struct page		*page;
+	struct address_space	*mapping;
+	int			status;
+
+	mapping = VFS_I(ip)->i_mapping;
+	do {
+		unsigned offset, bytes;
+		void *fsdata;
+
+		offset = (pos & (PAGE_CACHE_SIZE -1)); /* Within page */
+		bytes = PAGE_CACHE_SIZE - offset;
+		if (bytes > count)
+			bytes = count;
+
+		status = pagecache_write_begin(NULL, mapping, pos, bytes,
+					AOP_FLAG_UNINTERRUPTIBLE,
+					&page, &fsdata);
+		if (status)
+			break;
+
+		zero_user(page, offset, bytes);
+
+		status = pagecache_write_end(NULL, mapping, pos, bytes, bytes,
+					page, fsdata);
+		WARN_ON(status <= 0); /* can't return less than zero! */
+		pos += bytes;
+		count -= bytes;
+		status = 0;
+	} while (count);
+
+	return (-status);
+}
+
+ssize_t			/* bytes read, or (-)  error */
+xfs_read(
+	xfs_inode_t		*ip,
+	struct kiocb		*iocb,
+	const struct iovec	*iovp,
+	unsigned int		segs,
+	loff_t			*offset,
+	int			ioflags)
+{
+	struct file		*file = iocb->ki_filp;
+	struct inode		*inode = file->f_mapping->host;
+	xfs_mount_t		*mp = ip->i_mount;
+	size_t			size = 0;
+	ssize_t			ret = 0;
+	xfs_fsize_t		n;
+	unsigned long		seg;
+
+
+	XFS_STATS_INC(xs_read_calls);
+
+	/* START copy & waste from filemap.c */
+	for (seg = 0; seg < segs; seg++) {
+		const struct iovec *iv = &iovp[seg];
+
+		/*
+		 * If any segment has a negative length, or the cumulative
+		 * length ever wraps negative then return -EINVAL.
+		 */
+		size += iv->iov_len;
+		if (unlikely((ssize_t)(size|iv->iov_len) < 0))
+			return XFS_ERROR(-EINVAL);
+	}
+	/* END copy & waste from filemap.c */
+
+	if (unlikely(ioflags & IO_ISDIRECT)) {
+		xfs_buftarg_t	*target =
+			XFS_IS_REALTIME_INODE(ip) ?
+				mp->m_rtdev_targp : mp->m_ddev_targp;
+		if ((*offset & target->bt_smask) ||
+		    (size & target->bt_smask)) {
+			if (*offset == ip->i_size) {
+				return (0);
+			}
+			return -XFS_ERROR(EINVAL);
+		}
+	}
+
+	n = XFS_MAXIOFFSET(mp) - *offset;
+	if ((n <= 0) || (size == 0))
+		return 0;
+
+	if (n < size)
+		size = n;
+
+	if (XFS_FORCED_SHUTDOWN(mp))
+		return -EIO;
+
+	if (unlikely(ioflags & IO_ISDIRECT))
+		mutex_lock(&inode->i_mutex);
+	xfs_ilock(ip, XFS_IOLOCK_SHARED);
+
+	if (DM_EVENT_ENABLED(ip, DM_EVENT_READ) && !(ioflags & IO_INVIS)) {
+		int dmflags = FILP_DELAY_FLAG(file) | DM_SEM_FLAG_RD(ioflags);
+		int iolock = XFS_IOLOCK_SHARED;
+
+		ret = -XFS_SEND_DATA(mp, DM_EVENT_READ, ip, *offset, size,
+					dmflags, &iolock);
+		if (ret) {
+			xfs_iunlock(ip, XFS_IOLOCK_SHARED);
+			if (unlikely(ioflags & IO_ISDIRECT))
+				mutex_unlock(&inode->i_mutex);
+			return ret;
+		}
+	}
+
+	if (unlikely(ioflags & IO_ISDIRECT)) {
+		if (inode->i_mapping->nrpages)
+			ret = -xfs_flushinval_pages(ip, (*offset & PAGE_CACHE_MASK),
+						    -1, FI_REMAPF_LOCKED);
+		mutex_unlock(&inode->i_mutex);
+		if (ret) {
+			xfs_iunlock(ip, XFS_IOLOCK_SHARED);
+			return ret;
+		}
+	}
+
+	trace_xfs_file_read(ip, size, *offset, ioflags);
+
+	iocb->ki_pos = *offset;
+	ret = generic_file_aio_read(iocb, iovp, segs, *offset);
+	if (ret > 0)
+		XFS_STATS_ADD(xs_read_bytes, ret);
+
+	xfs_iunlock(ip, XFS_IOLOCK_SHARED);
+	return ret;
+}
+
+ssize_t
+xfs_splice_read(
+	xfs_inode_t		*ip,
+	struct file		*infilp,
+	loff_t			*ppos,
+	struct pipe_inode_info	*pipe,
+	size_t			count,
+	int			flags,
+	int			ioflags)
+{
+	xfs_mount_t		*mp = ip->i_mount;
+	ssize_t			ret;
+
+	XFS_STATS_INC(xs_read_calls);
+	if (XFS_FORCED_SHUTDOWN(ip->i_mount))
+		return -EIO;
+
+	xfs_ilock(ip, XFS_IOLOCK_SHARED);
+
+	if (DM_EVENT_ENABLED(ip, DM_EVENT_READ) && !(ioflags & IO_INVIS)) {
+		int iolock = XFS_IOLOCK_SHARED;
+		int error;
+
+		error = XFS_SEND_DATA(mp, DM_EVENT_READ, ip, *ppos, count,
+					FILP_DELAY_FLAG(infilp), &iolock);
+		if (error) {
+			xfs_iunlock(ip, XFS_IOLOCK_SHARED);
+			return -error;
+		}
+	}
+
+	trace_xfs_file_splice_read(ip, count, *ppos, ioflags);
+
+	ret = generic_file_splice_read(infilp, ppos, pipe, count, flags);
+	if (ret > 0)
+		XFS_STATS_ADD(xs_read_bytes, ret);
+
+	xfs_iunlock(ip, XFS_IOLOCK_SHARED);
+	return ret;
+}
+
+ssize_t
+xfs_splice_write(
+	xfs_inode_t		*ip,
+	struct pipe_inode_info	*pipe,
+	struct file		*outfilp,
+	loff_t			*ppos,
+	size_t			count,
+	int			flags,
+	int			ioflags)
+{
+	xfs_mount_t		*mp = ip->i_mount;
+	ssize_t			ret;
+	struct inode		*inode = outfilp->f_mapping->host;
+	xfs_fsize_t		isize, new_size;
+
+	XFS_STATS_INC(xs_write_calls);
+	if (XFS_FORCED_SHUTDOWN(ip->i_mount))
+		return -EIO;
+
+	xfs_ilock(ip, XFS_IOLOCK_EXCL);
+
+	if (DM_EVENT_ENABLED(ip, DM_EVENT_WRITE) && !(ioflags & IO_INVIS)) {
+		int iolock = XFS_IOLOCK_EXCL;
+		int error;
+
+		error = XFS_SEND_DATA(mp, DM_EVENT_WRITE, ip, *ppos, count,
+					FILP_DELAY_FLAG(outfilp), &iolock);
+		if (error) {
+			xfs_iunlock(ip, XFS_IOLOCK_EXCL);
+			return -error;
+		}
+	}
+
+	new_size = *ppos + count;
+
+	xfs_ilock(ip, XFS_ILOCK_EXCL);
+	if (new_size > ip->i_size)
+		ip->i_new_size = new_size;
+	xfs_iunlock(ip, XFS_ILOCK_EXCL);
+
+	trace_xfs_file_splice_write(ip, count, *ppos, ioflags);
+
+	ret = generic_file_splice_write(pipe, outfilp, ppos, count, flags);
+	if (ret > 0)
+		XFS_STATS_ADD(xs_write_bytes, ret);
+
+	isize = i_size_read(inode);
+	if (unlikely(ret < 0 && ret != -EFAULT && *ppos > isize))
+		*ppos = isize;
+
+	if (*ppos > ip->i_size) {
+		xfs_ilock(ip, XFS_ILOCK_EXCL);
+		if (*ppos > ip->i_size)
+			ip->i_size = *ppos;
+		xfs_iunlock(ip, XFS_ILOCK_EXCL);
+	}
+
+	if (ip->i_new_size) {
+		xfs_ilock(ip, XFS_ILOCK_EXCL);
+		ip->i_new_size = 0;
+		if (ip->i_d.di_size > ip->i_size)
+			ip->i_d.di_size = ip->i_size;
+		xfs_iunlock(ip, XFS_ILOCK_EXCL);
+	}
+	xfs_iunlock(ip, XFS_IOLOCK_EXCL);
+	return ret;
+}
+
+/*
+ * This routine is called to handle zeroing any space in the last
+ * block of the file that is beyond the EOF.  We do this since the
+ * size is being increased without writing anything to that block
+ * and we don't want anyone to read the garbage on the disk.
+ */
+STATIC int				/* error (positive) */
+xfs_zero_last_block(
+	xfs_inode_t	*ip,
+	xfs_fsize_t	offset,
+	xfs_fsize_t	isize)
+{
+	xfs_fileoff_t	last_fsb;
+	xfs_mount_t	*mp = ip->i_mount;
+	int		nimaps;
+	int		zero_offset;
+	int		zero_len;
+	int		error = 0;
+	xfs_bmbt_irec_t	imap;
+
+	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
+
+	zero_offset = XFS_B_FSB_OFFSET(mp, isize);
+	if (zero_offset == 0) {
+		/*
+		 * There are no extra bytes in the last block on disk to
+		 * zero, so return.
+		 */
+		return 0;
+	}
+
+	last_fsb = XFS_B_TO_FSBT(mp, isize);
+	nimaps = 1;
+	error = xfs_bmapi(NULL, ip, last_fsb, 1, 0, NULL, 0, &imap,
+			  &nimaps, NULL, NULL);
+	if (error) {
+		return error;
+	}
+	ASSERT(nimaps > 0);
+	/*
+	 * If the block underlying isize is just a hole, then there
+	 * is nothing to zero.
+	 */
+	if (imap.br_startblock == HOLESTARTBLOCK) {
+		return 0;
+	}
+	/*
+	 * Zero the part of the last block beyond the EOF, and write it
+	 * out sync.  We need to drop the ilock while we do this so we
+	 * don't deadlock when the buffer cache calls back to us.
+	 */
+	xfs_iunlock(ip, XFS_ILOCK_EXCL);
+
+	zero_len = mp->m_sb.sb_blocksize - zero_offset;
+	if (isize + zero_len > offset)
+		zero_len = offset - isize;
+	error = xfs_iozero(ip, isize, zero_len);
+
+	xfs_ilock(ip, XFS_ILOCK_EXCL);
+	ASSERT(error >= 0);
+	return error;
+}
+
+/*
+ * Zero any on disk space between the current EOF and the new,
+ * larger EOF.  This handles the normal case of zeroing the remainder
+ * of the last block in the file and the unusual case of zeroing blocks
+ * out beyond the size of the file.  This second case only happens
+ * with fixed size extents and when the system crashes before the inode
+ * size was updated but after blocks were allocated.  If fill is set,
+ * then any holes in the range are filled and zeroed.  If not, the holes
+ * are left alone as holes.
+ */
+
+int					/* error (positive) */
+xfs_zero_eof(
+	xfs_inode_t	*ip,
+	xfs_off_t	offset,		/* starting I/O offset */
+	xfs_fsize_t	isize)		/* current inode size */
+{
+	xfs_mount_t	*mp = ip->i_mount;
+	xfs_fileoff_t	start_zero_fsb;
+	xfs_fileoff_t	end_zero_fsb;
+	xfs_fileoff_t	zero_count_fsb;
+	xfs_fileoff_t	last_fsb;
+	xfs_fileoff_t	zero_off;
+	xfs_fsize_t	zero_len;
+	int		nimaps;
+	int		error = 0;
+	xfs_bmbt_irec_t	imap;
+
+	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL));
+	ASSERT(offset > isize);
+
+	/*
+	 * First handle zeroing the block on which isize resides.
+	 * We only zero a part of that block so it is handled specially.
+	 */
+	error = xfs_zero_last_block(ip, offset, isize);
+	if (error) {
+		ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL));
+		return error;
+	}
+
+	/*
+	 * Calculate the range between the new size and the old
+	 * where blocks needing to be zeroed may exist.  To get the
+	 * block where the last byte in the file currently resides,
+	 * we need to subtract one from the size and truncate back
+	 * to a block boundary.  We subtract 1 in case the size is
+	 * exactly on a block boundary.
+	 */
+	last_fsb = isize ? XFS_B_TO_FSBT(mp, isize - 1) : (xfs_fileoff_t)-1;
+	start_zero_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)isize);
+	end_zero_fsb = XFS_B_TO_FSBT(mp, offset - 1);
+	ASSERT((xfs_sfiloff_t)last_fsb < (xfs_sfiloff_t)start_zero_fsb);
+	if (last_fsb == end_zero_fsb) {
+		/*
+		 * The size was only incremented on its last block.
+		 * We took care of that above, so just return.
+		 */
+		return 0;
+	}
+
+	ASSERT(start_zero_fsb <= end_zero_fsb);
+	while (start_zero_fsb <= end_zero_fsb) {
+		nimaps = 1;
+		zero_count_fsb = end_zero_fsb - start_zero_fsb + 1;
+		error = xfs_bmapi(NULL, ip, start_zero_fsb, zero_count_fsb,
+				  0, NULL, 0, &imap, &nimaps, NULL, NULL);
+		if (error) {
+			ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL));
+			return error;
+		}
+		ASSERT(nimaps > 0);
+
+		if (imap.br_state == XFS_EXT_UNWRITTEN ||
+		    imap.br_startblock == HOLESTARTBLOCK) {
+			/*
+			 * This loop handles initializing pages that were
+			 * partially initialized by the code below this
+			 * loop. It basically zeroes the part of the page
+			 * that sits on a hole and sets the page as P_HOLE
+			 * and calls remapf if it is a mapped file.
+			 */
+			start_zero_fsb = imap.br_startoff + imap.br_blockcount;
+			ASSERT(start_zero_fsb <= (end_zero_fsb + 1));
+			continue;
+		}
+
+		/*
+		 * There are blocks we need to zero.
+		 * Drop the inode lock while we're doing the I/O.
+		 * We'll still have the iolock to protect us.
+		 */
+		xfs_iunlock(ip, XFS_ILOCK_EXCL);
+
+		zero_off = XFS_FSB_TO_B(mp, start_zero_fsb);
+		zero_len = XFS_FSB_TO_B(mp, imap.br_blockcount);
+
+		if ((zero_off + zero_len) > offset)
+			zero_len = offset - zero_off;
+
+		error = xfs_iozero(ip, zero_off, zero_len);
+		if (error) {
+			goto out_lock;
+		}
+
+		start_zero_fsb = imap.br_startoff + imap.br_blockcount;
+		ASSERT(start_zero_fsb <= (end_zero_fsb + 1));
+
+		xfs_ilock(ip, XFS_ILOCK_EXCL);
+	}
+
+	return 0;
+
+out_lock:
+	xfs_ilock(ip, XFS_ILOCK_EXCL);
+	ASSERT(error >= 0);
+	return error;
+}
+
+ssize_t				/* bytes written, or (-) error */
+xfs_write(
+	struct xfs_inode	*xip,
+	struct kiocb		*iocb,
+	const struct iovec	*iovp,
+	unsigned int		nsegs,
+	loff_t			*offset,
+	int			ioflags)
+{
+	struct file		*file = iocb->ki_filp;
+	struct address_space	*mapping = file->f_mapping;
+	struct inode		*inode = mapping->host;
+	unsigned long		segs = nsegs;
+	xfs_mount_t		*mp;
+	ssize_t			ret = 0, error = 0;
+	xfs_fsize_t		isize, new_size;
+	int			iolock;
+	int			eventsent = 0;
+	size_t			ocount = 0, count;
+	loff_t			pos;
+	int			need_i_mutex;
+
+	XFS_STATS_INC(xs_write_calls);
+
+	error = generic_segment_checks(iovp, &segs, &ocount, VERIFY_READ);
+	if (error)
+		return error;
+
+	count = ocount;
+	pos = *offset;
+
+	if (count == 0)
+		return 0;
+
+	mp = xip->i_mount;
+
+	xfs_wait_for_freeze(mp, SB_FREEZE_WRITE);
+
+	if (XFS_FORCED_SHUTDOWN(mp))
+		return -EIO;
+
+relock:
+	if (ioflags & IO_ISDIRECT) {
+		iolock = XFS_IOLOCK_SHARED;
+		need_i_mutex = 0;
+	} else {
+		iolock = XFS_IOLOCK_EXCL;
+		need_i_mutex = 1;
+		mutex_lock(&inode->i_mutex);
+	}
+
+	xfs_ilock(xip, XFS_ILOCK_EXCL|iolock);
+
+start:
+	error = -generic_write_checks(file, &pos, &count,
+					S_ISBLK(inode->i_mode));
+	if (error) {
+		xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock);
+		goto out_unlock_mutex;
+	}
+
+	if ((DM_EVENT_ENABLED(xip, DM_EVENT_WRITE) &&
+	    !(ioflags & IO_INVIS) && !eventsent)) {
+		int		dmflags = FILP_DELAY_FLAG(file);
+
+		if (need_i_mutex)
+			dmflags |= DM_FLAGS_IMUX;
+
+		xfs_iunlock(xip, XFS_ILOCK_EXCL);
+		error = XFS_SEND_DATA(xip->i_mount, DM_EVENT_WRITE, xip,
+				      pos, count, dmflags, &iolock);
+		if (error) {
+			goto out_unlock_internal;
+		}
+		xfs_ilock(xip, XFS_ILOCK_EXCL);
+		eventsent = 1;
+
+		/*
+		 * The iolock was dropped and reacquired in XFS_SEND_DATA
+		 * so we have to recheck the size when appending.
+		 * We will only "goto start;" once, since having sent the
+		 * event prevents another call to XFS_SEND_DATA, which is
+		 * what allows the size to change in the first place.
+		 */
+		if ((file->f_flags & O_APPEND) && pos != xip->i_size)
+			goto start;
+	}
+
+	if (ioflags & IO_ISDIRECT) {
+		xfs_buftarg_t	*target =
+			XFS_IS_REALTIME_INODE(xip) ?
+				mp->m_rtdev_targp : mp->m_ddev_targp;
+
+		if ((pos & target->bt_smask) || (count & target->bt_smask)) {
+			xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock);
+			return XFS_ERROR(-EINVAL);
+		}
+
+		if (!need_i_mutex && (mapping->nrpages || pos > xip->i_size)) {
+			xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock);
+			iolock = XFS_IOLOCK_EXCL;
+			need_i_mutex = 1;
+			mutex_lock(&inode->i_mutex);
+			xfs_ilock(xip, XFS_ILOCK_EXCL|iolock);
+			goto start;
+		}
+	}
+
+	new_size = pos + count;
+	if (new_size > xip->i_size)
+		xip->i_new_size = new_size;
+
+	if (likely(!(ioflags & IO_INVIS)))
+		file_update_time(file);
+
+	/*
+	 * If the offset is beyond the size of the file, we have a couple
+	 * of things to do. First, if there is already space allocated
+	 * we need to either create holes or zero the disk or ...
+	 *
+	 * If there is a page where the previous size lands, we need
+	 * to zero it out up to the new size.
+	 */
+
+	if (pos > xip->i_size) {
+		error = xfs_zero_eof(xip, pos, xip->i_size);
+		if (error) {
+			xfs_iunlock(xip, XFS_ILOCK_EXCL);
+			goto out_unlock_internal;
+		}
+	}
+	xfs_iunlock(xip, XFS_ILOCK_EXCL);
+
+	/*
+	 * If we're writing the file then make sure to clear the
+	 * setuid and setgid bits if the process is not being run
+	 * by root.  This keeps people from modifying setuid and
+	 * setgid binaries.
+	 */
+	error = -file_remove_suid(file);
+	if (unlikely(error))
+		goto out_unlock_internal;
+
+	/* We can write back this queue in page reclaim */
+	current->backing_dev_info = mapping->backing_dev_info;
+
+	if ((ioflags & IO_ISDIRECT)) {
+		if (mapping->nrpages) {
+			WARN_ON(need_i_mutex == 0);
+			error = xfs_flushinval_pages(xip,
+					(pos & PAGE_CACHE_MASK),
+					-1, FI_REMAPF_LOCKED);
+			if (error)
+				goto out_unlock_internal;
+		}
+
+		if (need_i_mutex) {
+			/* demote the lock now the cached pages are gone */
+			xfs_ilock_demote(xip, XFS_IOLOCK_EXCL);
+			mutex_unlock(&inode->i_mutex);
+
+			iolock = XFS_IOLOCK_SHARED;
+			need_i_mutex = 0;
+		}
+
+		trace_xfs_file_direct_write(xip, count, *offset, ioflags);
+		ret = generic_file_direct_write(iocb, iovp,
+				&segs, pos, offset, count, ocount);
+
+		/*
+		 * direct-io write to a hole: fall through to buffered I/O
+		 * for completing the rest of the request.
+		 */
+		if (ret >= 0 && ret != count) {
+			XFS_STATS_ADD(xs_write_bytes, ret);
+
+			pos += ret;
+			count -= ret;
+
+			ioflags &= ~IO_ISDIRECT;
+			xfs_iunlock(xip, iolock);
+			goto relock;
+		}
+	} else {
+		int enospc = 0;
+		ssize_t ret2 = 0;
+
+write_retry:
+		trace_xfs_file_buffered_write(xip, count, *offset, ioflags);
+		ret2 = generic_file_buffered_write(iocb, iovp, segs,
+				pos, offset, count, ret);
+		/*
+		 * if we just got an ENOSPC, flush the inode now we
+		 * aren't holding any page locks and retry *once*
+		 */
+		if (ret2 == -ENOSPC && !enospc) {
+			error = xfs_flush_pages(xip, 0, -1, 0, FI_NONE);
+			if (error)
+				goto out_unlock_internal;
+			enospc = 1;
+			goto write_retry;
+		}
+		ret = ret2;
+	}
+
+	current->backing_dev_info = NULL;
+
+	isize = i_size_read(inode);
+	if (unlikely(ret < 0 && ret != -EFAULT && *offset > isize))
+		*offset = isize;
+
+	if (*offset > xip->i_size) {
+		xfs_ilock(xip, XFS_ILOCK_EXCL);
+		if (*offset > xip->i_size)
+			xip->i_size = *offset;
+		xfs_iunlock(xip, XFS_ILOCK_EXCL);
+	}
+
+	if (ret == -ENOSPC &&
+	    DM_EVENT_ENABLED(xip, DM_EVENT_NOSPACE) && !(ioflags & IO_INVIS)) {
+		xfs_iunlock(xip, iolock);
+		if (need_i_mutex)
+			mutex_unlock(&inode->i_mutex);
+		error = XFS_SEND_NAMESP(xip->i_mount, DM_EVENT_NOSPACE, xip,
+				DM_RIGHT_NULL, xip, DM_RIGHT_NULL, NULL, NULL,
+				0, 0, 0); /* Delay flag intentionally  unused */
+		if (need_i_mutex)
+			mutex_lock(&inode->i_mutex);
+		xfs_ilock(xip, iolock);
+		if (error)
+			goto out_unlock_internal;
+		goto start;
+	}
+
+	error = -ret;
+	if (ret <= 0)
+		goto out_unlock_internal;
+
+	XFS_STATS_ADD(xs_write_bytes, ret);
+
+	/* Handle various SYNC-type writes */
+	if ((file->f_flags & O_DSYNC) || IS_SYNC(inode)) {
+		loff_t end = pos + ret - 1;
+		int error2;
+
+		xfs_iunlock(xip, iolock);
+		if (need_i_mutex)
+			mutex_unlock(&inode->i_mutex);
+
+		error2 = filemap_write_and_wait_range(mapping, pos, end);
+		if (!error)
+			error = error2;
+		if (need_i_mutex)
+			mutex_lock(&inode->i_mutex);
+		xfs_ilock(xip, iolock);
+
+		error2 = xfs_fsync(xip);
+		if (!error)
+			error = error2;
+	}
+
+ out_unlock_internal:
+	if (xip->i_new_size) {
+		xfs_ilock(xip, XFS_ILOCK_EXCL);
+		xip->i_new_size = 0;
+		/*
+		 * If this was a direct or synchronous I/O that failed (such
+		 * as ENOSPC) then part of the I/O may have been written to
+		 * disk before the error occured.  In this case the on-disk
+		 * file size may have been adjusted beyond the in-memory file
+		 * size and now needs to be truncated back.
+		 */
+		if (xip->i_d.di_size > xip->i_size)
+			xip->i_d.di_size = xip->i_size;
+		xfs_iunlock(xip, XFS_ILOCK_EXCL);
+	}
+	xfs_iunlock(xip, iolock);
+ out_unlock_mutex:
+	if (need_i_mutex)
+		mutex_unlock(&inode->i_mutex);
+	return -error;
+}
+
 STATIC ssize_t
 xfs_file_aio_read(
 	struct kiocb		*iocb,
Index: xfs/fs/xfs/linux-2.6/xfs_lrw.c
===================================================================
--- xfs.orig/fs/xfs/linux-2.6/xfs_lrw.c	2010-02-13 22:51:38.119272745 +0100
+++ /dev/null	1970-01-01 00:00:00.000000000 +0000
@@ -1,796 +0,0 @@
-/*
- * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
- * All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it would be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write the Free Software Foundation,
- * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
- */
-#include "xfs.h"
-#include "xfs_fs.h"
-#include "xfs_bit.h"
-#include "xfs_log.h"
-#include "xfs_inum.h"
-#include "xfs_trans.h"
-#include "xfs_sb.h"
-#include "xfs_ag.h"
-#include "xfs_dir2.h"
-#include "xfs_alloc.h"
-#include "xfs_dmapi.h"
-#include "xfs_quota.h"
-#include "xfs_mount.h"
-#include "xfs_bmap_btree.h"
-#include "xfs_alloc_btree.h"
-#include "xfs_ialloc_btree.h"
-#include "xfs_dir2_sf.h"
-#include "xfs_attr_sf.h"
-#include "xfs_dinode.h"
-#include "xfs_inode.h"
-#include "xfs_bmap.h"
-#include "xfs_btree.h"
-#include "xfs_ialloc.h"
-#include "xfs_rtalloc.h"
-#include "xfs_error.h"
-#include "xfs_itable.h"
-#include "xfs_rw.h"
-#include "xfs_attr.h"
-#include "xfs_inode_item.h"
-#include "xfs_buf_item.h"
-#include "xfs_utils.h"
-#include "xfs_iomap.h"
-#include "xfs_vnodeops.h"
-#include "xfs_trace.h"
-
-#include <linux/capability.h>
-#include <linux/writeback.h>
-
-
-/*
- *	xfs_iozero
- *
- *	xfs_iozero clears the specified range of buffer supplied,
- *	and marks all the affected blocks as valid and modified.  If
- *	an affected block is not allocated, it will be allocated.  If
- *	an affected block is not completely overwritten, and is not
- *	valid before the operation, it will be read from disk before
- *	being partially zeroed.
- */
-STATIC int
-xfs_iozero(
-	struct xfs_inode	*ip,	/* inode			*/
-	loff_t			pos,	/* offset in file		*/
-	size_t			count)	/* size of data to zero		*/
-{
-	struct page		*page;
-	struct address_space	*mapping;
-	int			status;
-
-	mapping = VFS_I(ip)->i_mapping;
-	do {
-		unsigned offset, bytes;
-		void *fsdata;
-
-		offset = (pos & (PAGE_CACHE_SIZE -1)); /* Within page */
-		bytes = PAGE_CACHE_SIZE - offset;
-		if (bytes > count)
-			bytes = count;
-
-		status = pagecache_write_begin(NULL, mapping, pos, bytes,
-					AOP_FLAG_UNINTERRUPTIBLE,
-					&page, &fsdata);
-		if (status)
-			break;
-
-		zero_user(page, offset, bytes);
-
-		status = pagecache_write_end(NULL, mapping, pos, bytes, bytes,
-					page, fsdata);
-		WARN_ON(status <= 0); /* can't return less than zero! */
-		pos += bytes;
-		count -= bytes;
-		status = 0;
-	} while (count);
-
-	return (-status);
-}
-
-ssize_t			/* bytes read, or (-)  error */
-xfs_read(
-	xfs_inode_t		*ip,
-	struct kiocb		*iocb,
-	const struct iovec	*iovp,
-	unsigned int		segs,
-	loff_t			*offset,
-	int			ioflags)
-{
-	struct file		*file = iocb->ki_filp;
-	struct inode		*inode = file->f_mapping->host;
-	xfs_mount_t		*mp = ip->i_mount;
-	size_t			size = 0;
-	ssize_t			ret = 0;
-	xfs_fsize_t		n;
-	unsigned long		seg;
-
-
-	XFS_STATS_INC(xs_read_calls);
-
-	/* START copy & waste from filemap.c */
-	for (seg = 0; seg < segs; seg++) {
-		const struct iovec *iv = &iovp[seg];
-
-		/*
-		 * If any segment has a negative length, or the cumulative
-		 * length ever wraps negative then return -EINVAL.
-		 */
-		size += iv->iov_len;
-		if (unlikely((ssize_t)(size|iv->iov_len) < 0))
-			return XFS_ERROR(-EINVAL);
-	}
-	/* END copy & waste from filemap.c */
-
-	if (unlikely(ioflags & IO_ISDIRECT)) {
-		xfs_buftarg_t	*target =
-			XFS_IS_REALTIME_INODE(ip) ?
-				mp->m_rtdev_targp : mp->m_ddev_targp;
-		if ((*offset & target->bt_smask) ||
-		    (size & target->bt_smask)) {
-			if (*offset == ip->i_size) {
-				return (0);
-			}
-			return -XFS_ERROR(EINVAL);
-		}
-	}
-
-	n = XFS_MAXIOFFSET(mp) - *offset;
-	if ((n <= 0) || (size == 0))
-		return 0;
-
-	if (n < size)
-		size = n;
-
-	if (XFS_FORCED_SHUTDOWN(mp))
-		return -EIO;
-
-	if (unlikely(ioflags & IO_ISDIRECT))
-		mutex_lock(&inode->i_mutex);
-	xfs_ilock(ip, XFS_IOLOCK_SHARED);
-
-	if (DM_EVENT_ENABLED(ip, DM_EVENT_READ) && !(ioflags & IO_INVIS)) {
-		int dmflags = FILP_DELAY_FLAG(file) | DM_SEM_FLAG_RD(ioflags);
-		int iolock = XFS_IOLOCK_SHARED;
-
-		ret = -XFS_SEND_DATA(mp, DM_EVENT_READ, ip, *offset, size,
-					dmflags, &iolock);
-		if (ret) {
-			xfs_iunlock(ip, XFS_IOLOCK_SHARED);
-			if (unlikely(ioflags & IO_ISDIRECT))
-				mutex_unlock(&inode->i_mutex);
-			return ret;
-		}
-	}
-
-	if (unlikely(ioflags & IO_ISDIRECT)) {
-		if (inode->i_mapping->nrpages)
-			ret = -xfs_flushinval_pages(ip, (*offset & PAGE_CACHE_MASK),
-						    -1, FI_REMAPF_LOCKED);
-		mutex_unlock(&inode->i_mutex);
-		if (ret) {
-			xfs_iunlock(ip, XFS_IOLOCK_SHARED);
-			return ret;
-		}
-	}
-
-	trace_xfs_file_read(ip, size, *offset, ioflags);
-
-	iocb->ki_pos = *offset;
-	ret = generic_file_aio_read(iocb, iovp, segs, *offset);
-	if (ret > 0)
-		XFS_STATS_ADD(xs_read_bytes, ret);
-
-	xfs_iunlock(ip, XFS_IOLOCK_SHARED);
-	return ret;
-}
-
-ssize_t
-xfs_splice_read(
-	xfs_inode_t		*ip,
-	struct file		*infilp,
-	loff_t			*ppos,
-	struct pipe_inode_info	*pipe,
-	size_t			count,
-	int			flags,
-	int			ioflags)
-{
-	xfs_mount_t		*mp = ip->i_mount;
-	ssize_t			ret;
-
-	XFS_STATS_INC(xs_read_calls);
-	if (XFS_FORCED_SHUTDOWN(ip->i_mount))
-		return -EIO;
-
-	xfs_ilock(ip, XFS_IOLOCK_SHARED);
-
-	if (DM_EVENT_ENABLED(ip, DM_EVENT_READ) && !(ioflags & IO_INVIS)) {
-		int iolock = XFS_IOLOCK_SHARED;
-		int error;
-
-		error = XFS_SEND_DATA(mp, DM_EVENT_READ, ip, *ppos, count,
-					FILP_DELAY_FLAG(infilp), &iolock);
-		if (error) {
-			xfs_iunlock(ip, XFS_IOLOCK_SHARED);
-			return -error;
-		}
-	}
-
-	trace_xfs_file_splice_read(ip, count, *ppos, ioflags);
-
-	ret = generic_file_splice_read(infilp, ppos, pipe, count, flags);
-	if (ret > 0)
-		XFS_STATS_ADD(xs_read_bytes, ret);
-
-	xfs_iunlock(ip, XFS_IOLOCK_SHARED);
-	return ret;
-}
-
-ssize_t
-xfs_splice_write(
-	xfs_inode_t		*ip,
-	struct pipe_inode_info	*pipe,
-	struct file		*outfilp,
-	loff_t			*ppos,
-	size_t			count,
-	int			flags,
-	int			ioflags)
-{
-	xfs_mount_t		*mp = ip->i_mount;
-	ssize_t			ret;
-	struct inode		*inode = outfilp->f_mapping->host;
-	xfs_fsize_t		isize, new_size;
-
-	XFS_STATS_INC(xs_write_calls);
-	if (XFS_FORCED_SHUTDOWN(ip->i_mount))
-		return -EIO;
-
-	xfs_ilock(ip, XFS_IOLOCK_EXCL);
-
-	if (DM_EVENT_ENABLED(ip, DM_EVENT_WRITE) && !(ioflags & IO_INVIS)) {
-		int iolock = XFS_IOLOCK_EXCL;
-		int error;
-
-		error = XFS_SEND_DATA(mp, DM_EVENT_WRITE, ip, *ppos, count,
-					FILP_DELAY_FLAG(outfilp), &iolock);
-		if (error) {
-			xfs_iunlock(ip, XFS_IOLOCK_EXCL);
-			return -error;
-		}
-	}
-
-	new_size = *ppos + count;
-
-	xfs_ilock(ip, XFS_ILOCK_EXCL);
-	if (new_size > ip->i_size)
-		ip->i_new_size = new_size;
-	xfs_iunlock(ip, XFS_ILOCK_EXCL);
-
-	trace_xfs_file_splice_write(ip, count, *ppos, ioflags);
-
-	ret = generic_file_splice_write(pipe, outfilp, ppos, count, flags);
-	if (ret > 0)
-		XFS_STATS_ADD(xs_write_bytes, ret);
-
-	isize = i_size_read(inode);
-	if (unlikely(ret < 0 && ret != -EFAULT && *ppos > isize))
-		*ppos = isize;
-
-	if (*ppos > ip->i_size) {
-		xfs_ilock(ip, XFS_ILOCK_EXCL);
-		if (*ppos > ip->i_size)
-			ip->i_size = *ppos;
-		xfs_iunlock(ip, XFS_ILOCK_EXCL);
-	}
-
-	if (ip->i_new_size) {
-		xfs_ilock(ip, XFS_ILOCK_EXCL);
-		ip->i_new_size = 0;
-		if (ip->i_d.di_size > ip->i_size)
-			ip->i_d.di_size = ip->i_size;
-		xfs_iunlock(ip, XFS_ILOCK_EXCL);
-	}
-	xfs_iunlock(ip, XFS_IOLOCK_EXCL);
-	return ret;
-}
-
-/*
- * This routine is called to handle zeroing any space in the last
- * block of the file that is beyond the EOF.  We do this since the
- * size is being increased without writing anything to that block
- * and we don't want anyone to read the garbage on the disk.
- */
-STATIC int				/* error (positive) */
-xfs_zero_last_block(
-	xfs_inode_t	*ip,
-	xfs_fsize_t	offset,
-	xfs_fsize_t	isize)
-{
-	xfs_fileoff_t	last_fsb;
-	xfs_mount_t	*mp = ip->i_mount;
-	int		nimaps;
-	int		zero_offset;
-	int		zero_len;
-	int		error = 0;
-	xfs_bmbt_irec_t	imap;
-
-	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
-
-	zero_offset = XFS_B_FSB_OFFSET(mp, isize);
-	if (zero_offset == 0) {
-		/*
-		 * There are no extra bytes in the last block on disk to
-		 * zero, so return.
-		 */
-		return 0;
-	}
-
-	last_fsb = XFS_B_TO_FSBT(mp, isize);
-	nimaps = 1;
-	error = xfs_bmapi(NULL, ip, last_fsb, 1, 0, NULL, 0, &imap,
-			  &nimaps, NULL, NULL);
-	if (error) {
-		return error;
-	}
-	ASSERT(nimaps > 0);
-	/*
-	 * If the block underlying isize is just a hole, then there
-	 * is nothing to zero.
-	 */
-	if (imap.br_startblock == HOLESTARTBLOCK) {
-		return 0;
-	}
-	/*
-	 * Zero the part of the last block beyond the EOF, and write it
-	 * out sync.  We need to drop the ilock while we do this so we
-	 * don't deadlock when the buffer cache calls back to us.
-	 */
-	xfs_iunlock(ip, XFS_ILOCK_EXCL);
-
-	zero_len = mp->m_sb.sb_blocksize - zero_offset;
-	if (isize + zero_len > offset)
-		zero_len = offset - isize;
-	error = xfs_iozero(ip, isize, zero_len);
-
-	xfs_ilock(ip, XFS_ILOCK_EXCL);
-	ASSERT(error >= 0);
-	return error;
-}
-
-/*
- * Zero any on disk space between the current EOF and the new,
- * larger EOF.  This handles the normal case of zeroing the remainder
- * of the last block in the file and the unusual case of zeroing blocks
- * out beyond the size of the file.  This second case only happens
- * with fixed size extents and when the system crashes before the inode
- * size was updated but after blocks were allocated.  If fill is set,
- * then any holes in the range are filled and zeroed.  If not, the holes
- * are left alone as holes.
- */
-
-int					/* error (positive) */
-xfs_zero_eof(
-	xfs_inode_t	*ip,
-	xfs_off_t	offset,		/* starting I/O offset */
-	xfs_fsize_t	isize)		/* current inode size */
-{
-	xfs_mount_t	*mp = ip->i_mount;
-	xfs_fileoff_t	start_zero_fsb;
-	xfs_fileoff_t	end_zero_fsb;
-	xfs_fileoff_t	zero_count_fsb;
-	xfs_fileoff_t	last_fsb;
-	xfs_fileoff_t	zero_off;
-	xfs_fsize_t	zero_len;
-	int		nimaps;
-	int		error = 0;
-	xfs_bmbt_irec_t	imap;
-
-	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL));
-	ASSERT(offset > isize);
-
-	/*
-	 * First handle zeroing the block on which isize resides.
-	 * We only zero a part of that block so it is handled specially.
-	 */
-	error = xfs_zero_last_block(ip, offset, isize);
-	if (error) {
-		ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL));
-		return error;
-	}
-
-	/*
-	 * Calculate the range between the new size and the old
-	 * where blocks needing to be zeroed may exist.  To get the
-	 * block where the last byte in the file currently resides,
-	 * we need to subtract one from the size and truncate back
-	 * to a block boundary.  We subtract 1 in case the size is
-	 * exactly on a block boundary.
-	 */
-	last_fsb = isize ? XFS_B_TO_FSBT(mp, isize - 1) : (xfs_fileoff_t)-1;
-	start_zero_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)isize);
-	end_zero_fsb = XFS_B_TO_FSBT(mp, offset - 1);
-	ASSERT((xfs_sfiloff_t)last_fsb < (xfs_sfiloff_t)start_zero_fsb);
-	if (last_fsb == end_zero_fsb) {
-		/*
-		 * The size was only incremented on its last block.
-		 * We took care of that above, so just return.
-		 */
-		return 0;
-	}
-
-	ASSERT(start_zero_fsb <= end_zero_fsb);
-	while (start_zero_fsb <= end_zero_fsb) {
-		nimaps = 1;
-		zero_count_fsb = end_zero_fsb - start_zero_fsb + 1;
-		error = xfs_bmapi(NULL, ip, start_zero_fsb, zero_count_fsb,
-				  0, NULL, 0, &imap, &nimaps, NULL, NULL);
-		if (error) {
-			ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL));
-			return error;
-		}
-		ASSERT(nimaps > 0);
-
-		if (imap.br_state == XFS_EXT_UNWRITTEN ||
-		    imap.br_startblock == HOLESTARTBLOCK) {
-			/*
-			 * This loop handles initializing pages that were
-			 * partially initialized by the code below this
-			 * loop. It basically zeroes the part of the page
-			 * that sits on a hole and sets the page as P_HOLE
-			 * and calls remapf if it is a mapped file.
-			 */
-			start_zero_fsb = imap.br_startoff + imap.br_blockcount;
-			ASSERT(start_zero_fsb <= (end_zero_fsb + 1));
-			continue;
-		}
-
-		/*
-		 * There are blocks we need to zero.
-		 * Drop the inode lock while we're doing the I/O.
-		 * We'll still have the iolock to protect us.
-		 */
-		xfs_iunlock(ip, XFS_ILOCK_EXCL);
-
-		zero_off = XFS_FSB_TO_B(mp, start_zero_fsb);
-		zero_len = XFS_FSB_TO_B(mp, imap.br_blockcount);
-
-		if ((zero_off + zero_len) > offset)
-			zero_len = offset - zero_off;
-
-		error = xfs_iozero(ip, zero_off, zero_len);
-		if (error) {
-			goto out_lock;
-		}
-
-		start_zero_fsb = imap.br_startoff + imap.br_blockcount;
-		ASSERT(start_zero_fsb <= (end_zero_fsb + 1));
-
-		xfs_ilock(ip, XFS_ILOCK_EXCL);
-	}
-
-	return 0;
-
-out_lock:
-	xfs_ilock(ip, XFS_ILOCK_EXCL);
-	ASSERT(error >= 0);
-	return error;
-}
-
-ssize_t				/* bytes written, or (-) error */
-xfs_write(
-	struct xfs_inode	*xip,
-	struct kiocb		*iocb,
-	const struct iovec	*iovp,
-	unsigned int		nsegs,
-	loff_t			*offset,
-	int			ioflags)
-{
-	struct file		*file = iocb->ki_filp;
-	struct address_space	*mapping = file->f_mapping;
-	struct inode		*inode = mapping->host;
-	unsigned long		segs = nsegs;
-	xfs_mount_t		*mp;
-	ssize_t			ret = 0, error = 0;
-	xfs_fsize_t		isize, new_size;
-	int			iolock;
-	int			eventsent = 0;
-	size_t			ocount = 0, count;
-	loff_t			pos;
-	int			need_i_mutex;
-
-	XFS_STATS_INC(xs_write_calls);
-
-	error = generic_segment_checks(iovp, &segs, &ocount, VERIFY_READ);
-	if (error)
-		return error;
-
-	count = ocount;
-	pos = *offset;
-
-	if (count == 0)
-		return 0;
-
-	mp = xip->i_mount;
-
-	xfs_wait_for_freeze(mp, SB_FREEZE_WRITE);
-
-	if (XFS_FORCED_SHUTDOWN(mp))
-		return -EIO;
-
-relock:
-	if (ioflags & IO_ISDIRECT) {
-		iolock = XFS_IOLOCK_SHARED;
-		need_i_mutex = 0;
-	} else {
-		iolock = XFS_IOLOCK_EXCL;
-		need_i_mutex = 1;
-		mutex_lock(&inode->i_mutex);
-	}
-
-	xfs_ilock(xip, XFS_ILOCK_EXCL|iolock);
-
-start:
-	error = -generic_write_checks(file, &pos, &count,
-					S_ISBLK(inode->i_mode));
-	if (error) {
-		xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock);
-		goto out_unlock_mutex;
-	}
-
-	if ((DM_EVENT_ENABLED(xip, DM_EVENT_WRITE) &&
-	    !(ioflags & IO_INVIS) && !eventsent)) {
-		int		dmflags = FILP_DELAY_FLAG(file);
-
-		if (need_i_mutex)
-			dmflags |= DM_FLAGS_IMUX;
-
-		xfs_iunlock(xip, XFS_ILOCK_EXCL);
-		error = XFS_SEND_DATA(xip->i_mount, DM_EVENT_WRITE, xip,
-				      pos, count, dmflags, &iolock);
-		if (error) {
-			goto out_unlock_internal;
-		}
-		xfs_ilock(xip, XFS_ILOCK_EXCL);
-		eventsent = 1;
-
-		/*
-		 * The iolock was dropped and reacquired in XFS_SEND_DATA
-		 * so we have to recheck the size when appending.
-		 * We will only "goto start;" once, since having sent the
-		 * event prevents another call to XFS_SEND_DATA, which is
-		 * what allows the size to change in the first place.
-		 */
-		if ((file->f_flags & O_APPEND) && pos != xip->i_size)
-			goto start;
-	}
-
-	if (ioflags & IO_ISDIRECT) {
-		xfs_buftarg_t	*target =
-			XFS_IS_REALTIME_INODE(xip) ?
-				mp->m_rtdev_targp : mp->m_ddev_targp;
-
-		if ((pos & target->bt_smask) || (count & target->bt_smask)) {
-			xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock);
-			return XFS_ERROR(-EINVAL);
-		}
-
-		if (!need_i_mutex && (mapping->nrpages || pos > xip->i_size)) {
-			xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock);
-			iolock = XFS_IOLOCK_EXCL;
-			need_i_mutex = 1;
-			mutex_lock(&inode->i_mutex);
-			xfs_ilock(xip, XFS_ILOCK_EXCL|iolock);
-			goto start;
-		}
-	}
-
-	new_size = pos + count;
-	if (new_size > xip->i_size)
-		xip->i_new_size = new_size;
-
-	if (likely(!(ioflags & IO_INVIS)))
-		file_update_time(file);
-
-	/*
-	 * If the offset is beyond the size of the file, we have a couple
-	 * of things to do. First, if there is already space allocated
-	 * we need to either create holes or zero the disk or ...
-	 *
-	 * If there is a page where the previous size lands, we need
-	 * to zero it out up to the new size.
-	 */
-
-	if (pos > xip->i_size) {
-		error = xfs_zero_eof(xip, pos, xip->i_size);
-		if (error) {
-			xfs_iunlock(xip, XFS_ILOCK_EXCL);
-			goto out_unlock_internal;
-		}
-	}
-	xfs_iunlock(xip, XFS_ILOCK_EXCL);
-
-	/*
-	 * If we're writing the file then make sure to clear the
-	 * setuid and setgid bits if the process is not being run
-	 * by root.  This keeps people from modifying setuid and
-	 * setgid binaries.
-	 */
-	error = -file_remove_suid(file);
-	if (unlikely(error))
-		goto out_unlock_internal;
-
-	/* We can write back this queue in page reclaim */
-	current->backing_dev_info = mapping->backing_dev_info;
-
-	if ((ioflags & IO_ISDIRECT)) {
-		if (mapping->nrpages) {
-			WARN_ON(need_i_mutex == 0);
-			error = xfs_flushinval_pages(xip,
-					(pos & PAGE_CACHE_MASK),
-					-1, FI_REMAPF_LOCKED);
-			if (error)
-				goto out_unlock_internal;
-		}
-
-		if (need_i_mutex) {
-			/* demote the lock now the cached pages are gone */
-			xfs_ilock_demote(xip, XFS_IOLOCK_EXCL);
-			mutex_unlock(&inode->i_mutex);
-
-			iolock = XFS_IOLOCK_SHARED;
-			need_i_mutex = 0;
-		}
-
-		trace_xfs_file_direct_write(xip, count, *offset, ioflags);
-		ret = generic_file_direct_write(iocb, iovp,
-				&segs, pos, offset, count, ocount);
-
-		/*
-		 * direct-io write to a hole: fall through to buffered I/O
-		 * for completing the rest of the request.
-		 */
-		if (ret >= 0 && ret != count) {
-			XFS_STATS_ADD(xs_write_bytes, ret);
-
-			pos += ret;
-			count -= ret;
-
-			ioflags &= ~IO_ISDIRECT;
-			xfs_iunlock(xip, iolock);
-			goto relock;
-		}
-	} else {
-		int enospc = 0;
-		ssize_t ret2 = 0;
-
-write_retry:
-		trace_xfs_file_buffered_write(xip, count, *offset, ioflags);
-		ret2 = generic_file_buffered_write(iocb, iovp, segs,
-				pos, offset, count, ret);
-		/*
-		 * if we just got an ENOSPC, flush the inode now we
-		 * aren't holding any page locks and retry *once*
-		 */
-		if (ret2 == -ENOSPC && !enospc) {
-			error = xfs_flush_pages(xip, 0, -1, 0, FI_NONE);
-			if (error)
-				goto out_unlock_internal;
-			enospc = 1;
-			goto write_retry;
-		}
-		ret = ret2;
-	}
-
-	current->backing_dev_info = NULL;
-
-	isize = i_size_read(inode);
-	if (unlikely(ret < 0 && ret != -EFAULT && *offset > isize))
-		*offset = isize;
-
-	if (*offset > xip->i_size) {
-		xfs_ilock(xip, XFS_ILOCK_EXCL);
-		if (*offset > xip->i_size)
-			xip->i_size = *offset;
-		xfs_iunlock(xip, XFS_ILOCK_EXCL);
-	}
-
-	if (ret == -ENOSPC &&
-	    DM_EVENT_ENABLED(xip, DM_EVENT_NOSPACE) && !(ioflags & IO_INVIS)) {
-		xfs_iunlock(xip, iolock);
-		if (need_i_mutex)
-			mutex_unlock(&inode->i_mutex);
-		error = XFS_SEND_NAMESP(xip->i_mount, DM_EVENT_NOSPACE, xip,
-				DM_RIGHT_NULL, xip, DM_RIGHT_NULL, NULL, NULL,
-				0, 0, 0); /* Delay flag intentionally  unused */
-		if (need_i_mutex)
-			mutex_lock(&inode->i_mutex);
-		xfs_ilock(xip, iolock);
-		if (error)
-			goto out_unlock_internal;
-		goto start;
-	}
-
-	error = -ret;
-	if (ret <= 0)
-		goto out_unlock_internal;
-
-	XFS_STATS_ADD(xs_write_bytes, ret);
-
-	/* Handle various SYNC-type writes */
-	if ((file->f_flags & O_DSYNC) || IS_SYNC(inode)) {
-		loff_t end = pos + ret - 1;
-		int error2;
-
-		xfs_iunlock(xip, iolock);
-		if (need_i_mutex)
-			mutex_unlock(&inode->i_mutex);
-
-		error2 = filemap_write_and_wait_range(mapping, pos, end);
-		if (!error)
-			error = error2;
-		if (need_i_mutex)
-			mutex_lock(&inode->i_mutex);
-		xfs_ilock(xip, iolock);
-
-		error2 = xfs_fsync(xip);
-		if (!error)
-			error = error2;
-	}
-
- out_unlock_internal:
-	if (xip->i_new_size) {
-		xfs_ilock(xip, XFS_ILOCK_EXCL);
-		xip->i_new_size = 0;
-		/*
-		 * If this was a direct or synchronous I/O that failed (such
-		 * as ENOSPC) then part of the I/O may have been written to
-		 * disk before the error occured.  In this case the on-disk
-		 * file size may have been adjusted beyond the in-memory file
-		 * size and now needs to be truncated back.
-		 */
-		if (xip->i_d.di_size > xip->i_size)
-			xip->i_d.di_size = xip->i_size;
-		xfs_iunlock(xip, XFS_ILOCK_EXCL);
-	}
-	xfs_iunlock(xip, iolock);
- out_unlock_mutex:
-	if (need_i_mutex)
-		mutex_unlock(&inode->i_mutex);
-	return -error;
-}
-
-/*
- * If the underlying (data/log/rt) device is readonly, there are some
- * operations that cannot proceed.
- */
-int
-xfs_dev_is_read_only(
-	xfs_mount_t		*mp,
-	char			*message)
-{
-	if (xfs_readonly_buftarg(mp->m_ddev_targp) ||
-	    xfs_readonly_buftarg(mp->m_logdev_targp) ||
-	    (mp->m_rtdev_targp && xfs_readonly_buftarg(mp->m_rtdev_targp))) {
-		cmn_err(CE_NOTE,
-			"XFS: %s required on read-only device.", message);
-		cmn_err(CE_NOTE,
-			"XFS: write access unavailable, cannot proceed.");
-		return EROFS;
-	}
-	return 0;
-}
Index: xfs/fs/xfs/xfs_vnodeops.h
===================================================================
--- xfs.orig/fs/xfs/xfs_vnodeops.h	2010-02-13 22:54:31.837254029 +0100
+++ xfs/fs/xfs/xfs_vnodeops.h	2010-02-13 22:55:36.050005675 +0100
@@ -50,18 +50,6 @@ int xfs_attr_set(struct xfs_inode *dp, c
 int xfs_attr_remove(struct xfs_inode *dp, const unsigned char *name, int flags);
 int xfs_attr_list(struct xfs_inode *dp, char *buffer, int bufsize,
 		int flags, struct attrlist_cursor_kern *cursor);
-ssize_t xfs_read(struct xfs_inode *ip, struct kiocb *iocb,
-		const struct iovec *iovp, unsigned int segs,
-		loff_t *offset, int ioflags);
-ssize_t xfs_splice_read(struct xfs_inode *ip, struct file *infilp,
-		loff_t *ppos, struct pipe_inode_info *pipe, size_t count,
-		int flags, int ioflags);
-ssize_t xfs_splice_write(struct xfs_inode *ip,
-		struct pipe_inode_info *pipe, struct file *outfilp,
-		loff_t *ppos, size_t count, int flags, int ioflags);
-ssize_t xfs_write(struct xfs_inode *xip, struct kiocb *iocb,
-		const struct iovec *iovp, unsigned int nsegs,
-		loff_t *offset, int ioflags);
 int xfs_bmap(struct xfs_inode *ip, xfs_off_t offset, ssize_t count,
 		int flags, struct xfs_iomap *iomapp, int *niomaps);
 void xfs_tosspages(struct xfs_inode *inode, xfs_off_t first,
Index: xfs/fs/xfs/xfs_mount.c
===================================================================
--- xfs.orig/fs/xfs/xfs_mount.c	2010-02-13 22:59:41.984259965 +0100
+++ xfs/fs/xfs/xfs_mount.c	2010-02-13 22:59:47.695254307 +0100
@@ -2052,6 +2052,26 @@ xfs_mount_log_sb(
 	return error;
 }
 
+/*
+ * If the underlying (data/log/rt) device is readonly, there are some
+ * operations that cannot proceed.
+ */
+int
+xfs_dev_is_read_only(
+	struct xfs_mount	*mp,
+	char			*message)
+{
+	if (xfs_readonly_buftarg(mp->m_ddev_targp) ||
+	    xfs_readonly_buftarg(mp->m_logdev_targp) ||
+	    (mp->m_rtdev_targp && xfs_readonly_buftarg(mp->m_rtdev_targp))) {
+		cmn_err(CE_NOTE,
+			"XFS: %s required on read-only device.", message);
+		cmn_err(CE_NOTE,
+			"XFS: write access unavailable, cannot proceed.");
+		return EROFS;
+	}
+	return 0;
+}
 
 #ifdef HAVE_PERCPU_SB
 /*

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Re: [PATCH 1/4] [PATCH 1/4] xfs: merge xfs_lrw.c into xfs_file.c

[Dave Chinner]

On Mon, Feb 15, 2010 at 04:44:46AM -0500, Christoph Hellwig wrote:
> Currently the code to implement the file operations is split over two small
> files.  Merge the content of xfs_lrw.c into xfs_file.c to have it in one
> place.  Note that I haven't done various cleanups that are possible after
> this yet, they will follow in the next patch.  Also the function 
> xfs_dev_is_read_only which was in xfs_lrw.c before really doesn't fit in
> here at all and was moved to xfs_mount.c.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Looks good to me, so:

Reviewed-by: Dave Chinner <david@fromorbit.com>

As an additional step, perhaps it be a good idea to get rid of
xfs_lrw.h as well?

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com

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Re: [PATCH 1/4] [PATCH 1/4] xfs: merge xfs_lrw.c into xfs_file.c

[Christoph Hellwig]

On Wed, Feb 17, 2010 at 02:36:26PM +1100, Dave Chinner wrote:
> On Mon, Feb 15, 2010 at 04:44:46AM -0500, Christoph Hellwig wrote:
> > Currently the code to implement the file operations is split over two small
> > files.  Merge the content of xfs_lrw.c into xfs_file.c to have it in one
> > place.  Note that I haven't done various cleanups that are possible after
> > this yet, they will follow in the next patch.  Also the function 
> > xfs_dev_is_read_only which was in xfs_lrw.c before really doesn't fit in
> > here at all and was moved to xfs_mount.c.
> > 
> > Signed-off-by: Christoph Hellwig <hch@lst.de>
> 
> Looks good to me, so:
> 
> Reviewed-by: Dave Chinner <david@fromorbit.com>
> 
> As an additional step, perhaps it be a good idea to get rid of
> xfs_lrw.h as well?

Yes, that's a good idea, I'll prepare a patch to do that.

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[PATCH 2/4] [PATCH 2/4] xfs: remove wrappers for read/write file operations

[Christoph Hellwig]

[-- Attachment #1: xfs-fops-cleanup --]
[-- Type: text/plain, Size: 14999 bytes --]

Currently the aio_read, aio_write, splice_read and splice_write file
operations are divided into a low-level routine doing all the work and
one that implements the Linux file operations and does minimal argument
wrapping.  This is a leftover from the days of the vnode operations layer
and can be removed to simplify the code a lot.

Signed-off-by: Christoph Hellwig <hch@lst.de>

Index: xfs/fs/xfs/linux-2.6/xfs_file.c
===================================================================
--- xfs.orig/fs/xfs/linux-2.6/xfs_file.c	2010-02-15 10:14:28.107003961 +0100
+++ xfs/fs/xfs/linux-2.6/xfs_file.c	2010-02-15 10:18:58.640023657 +0100
@@ -96,28 +96,34 @@ xfs_iozero(
 	return (-status);
 }
 
-ssize_t			/* bytes read, or (-)  error */
-xfs_read(
-	xfs_inode_t		*ip,
+STATIC ssize_t
+xfs_file_aio_read(
 	struct kiocb		*iocb,
 	const struct iovec	*iovp,
-	unsigned int		segs,
-	loff_t			*offset,
-	int			ioflags)
+	unsigned long		nr_segs,
+	loff_t			pos)
 {
 	struct file		*file = iocb->ki_filp;
 	struct inode		*inode = file->f_mapping->host;
-	xfs_mount_t		*mp = ip->i_mount;
+	struct xfs_inode	*ip = XFS_I(inode);
+	struct xfs_mount	*mp = ip->i_mount;
 	size_t			size = 0;
 	ssize_t			ret = 0;
+	int			ioflags = 0;
 	xfs_fsize_t		n;
 	unsigned long		seg;
 
-
 	XFS_STATS_INC(xs_read_calls);
 
+	BUG_ON(iocb->ki_pos != pos);
+
+	if (unlikely(file->f_flags & O_DIRECT))
+		ioflags |= IO_ISDIRECT;
+	if (file->f_mode & FMODE_NOCMTIME)
+		ioflags |= IO_INVIS;
+
 	/* START copy & waste from filemap.c */
-	for (seg = 0; seg < segs; seg++) {
+	for (seg = 0; seg < nr_segs; seg++) {
 		const struct iovec *iv = &iovp[seg];
 
 		/*
@@ -134,17 +140,16 @@ xfs_read(
 		xfs_buftarg_t	*target =
 			XFS_IS_REALTIME_INODE(ip) ?
 				mp->m_rtdev_targp : mp->m_ddev_targp;
-		if ((*offset & target->bt_smask) ||
+		if ((iocb->ki_pos & target->bt_smask) ||
 		    (size & target->bt_smask)) {
-			if (*offset == ip->i_size) {
-				return (0);
-			}
+			if (iocb->ki_pos == ip->i_size)
+				return 0;
 			return -XFS_ERROR(EINVAL);
 		}
 	}
 
-	n = XFS_MAXIOFFSET(mp) - *offset;
-	if ((n <= 0) || (size == 0))
+	n = XFS_MAXIOFFSET(mp) - iocb->ki_pos;
+	if (n <= 0 || size == 0)
 		return 0;
 
 	if (n < size)
@@ -161,7 +166,7 @@ xfs_read(
 		int dmflags = FILP_DELAY_FLAG(file) | DM_SEM_FLAG_RD(ioflags);
 		int iolock = XFS_IOLOCK_SHARED;
 
-		ret = -XFS_SEND_DATA(mp, DM_EVENT_READ, ip, *offset, size,
+		ret = -XFS_SEND_DATA(mp, DM_EVENT_READ, ip, iocb->ki_pos, size,
 					dmflags, &iolock);
 		if (ret) {
 			xfs_iunlock(ip, XFS_IOLOCK_SHARED);
@@ -172,9 +177,11 @@ xfs_read(
 	}
 
 	if (unlikely(ioflags & IO_ISDIRECT)) {
-		if (inode->i_mapping->nrpages)
-			ret = -xfs_flushinval_pages(ip, (*offset & PAGE_CACHE_MASK),
-						    -1, FI_REMAPF_LOCKED);
+		if (inode->i_mapping->nrpages) {
+			ret = -xfs_flushinval_pages(ip,
+					(iocb->ki_pos & PAGE_CACHE_MASK),
+					-1, FI_REMAPF_LOCKED);
+		}
 		mutex_unlock(&inode->i_mutex);
 		if (ret) {
 			xfs_iunlock(ip, XFS_IOLOCK_SHARED);
@@ -182,10 +189,9 @@ xfs_read(
 		}
 	}
 
-	trace_xfs_file_read(ip, size, *offset, ioflags);
+	trace_xfs_file_read(ip, size, iocb->ki_pos, ioflags);
 
-	iocb->ki_pos = *offset;
-	ret = generic_file_aio_read(iocb, iovp, segs, *offset);
+	ret = generic_file_aio_read(iocb, iovp, nr_segs, iocb->ki_pos);
 	if (ret > 0)
 		XFS_STATS_ADD(xs_read_bytes, ret);
 
@@ -193,20 +199,24 @@ xfs_read(
 	return ret;
 }
 
-ssize_t
-xfs_splice_read(
-	xfs_inode_t		*ip,
+STATIC ssize_t
+xfs_file_splice_read(
 	struct file		*infilp,
 	loff_t			*ppos,
 	struct pipe_inode_info	*pipe,
 	size_t			count,
-	int			flags,
-	int			ioflags)
+	unsigned int		flags)
 {
-	xfs_mount_t		*mp = ip->i_mount;
+	struct xfs_inode	*ip = XFS_I(infilp->f_mapping->host);
+	struct xfs_mount	*mp = ip->i_mount;
+	int			ioflags = 0;
 	ssize_t			ret;
 
 	XFS_STATS_INC(xs_read_calls);
+
+	if (infilp->f_mode & FMODE_NOCMTIME)
+		ioflags |= IO_INVIS;
+
 	if (XFS_FORCED_SHUTDOWN(ip->i_mount))
 		return -EIO;
 
@@ -234,22 +244,26 @@ xfs_splice_read(
 	return ret;
 }
 
-ssize_t
-xfs_splice_write(
-	xfs_inode_t		*ip,
+STATIC ssize_t
+xfs_file_splice_write(
 	struct pipe_inode_info	*pipe,
 	struct file		*outfilp,
 	loff_t			*ppos,
 	size_t			count,
-	int			flags,
-	int			ioflags)
+	unsigned int		flags)
 {
-	xfs_mount_t		*mp = ip->i_mount;
-	ssize_t			ret;
 	struct inode		*inode = outfilp->f_mapping->host;
+	struct xfs_inode	*ip = XFS_I(inode);
+	struct xfs_mount	*mp = ip->i_mount;
 	xfs_fsize_t		isize, new_size;
+	int			ioflags = 0;
+	ssize_t			ret;
 
 	XFS_STATS_INC(xs_write_calls);
+
+	if (outfilp->f_mode & FMODE_NOCMTIME)
+		ioflags |= IO_INVIS;
+
 	if (XFS_FORCED_SHUTDOWN(ip->i_mount))
 		return -EIO;
 
@@ -484,42 +498,43 @@ out_lock:
 	return error;
 }
 
-ssize_t				/* bytes written, or (-) error */
-xfs_write(
-	struct xfs_inode	*xip,
+STATIC ssize_t
+xfs_file_aio_write(
 	struct kiocb		*iocb,
 	const struct iovec	*iovp,
-	unsigned int		nsegs,
-	loff_t			*offset,
-	int			ioflags)
+	unsigned long		nr_segs,
+	loff_t			pos)
 {
 	struct file		*file = iocb->ki_filp;
 	struct address_space	*mapping = file->f_mapping;
 	struct inode		*inode = mapping->host;
-	unsigned long		segs = nsegs;
-	xfs_mount_t		*mp;
+	struct xfs_inode	*ip = XFS_I(inode);
+	struct xfs_mount	*mp = ip->i_mount;
 	ssize_t			ret = 0, error = 0;
+	int			ioflags = 0;
 	xfs_fsize_t		isize, new_size;
 	int			iolock;
 	int			eventsent = 0;
 	size_t			ocount = 0, count;
-	loff_t			pos;
 	int			need_i_mutex;
 
 	XFS_STATS_INC(xs_write_calls);
 
-	error = generic_segment_checks(iovp, &segs, &ocount, VERIFY_READ);
+	BUG_ON(iocb->ki_pos != pos);
+
+	if (unlikely(file->f_flags & O_DIRECT))
+		ioflags |= IO_ISDIRECT;
+	if (file->f_mode & FMODE_NOCMTIME)
+		ioflags |= IO_INVIS;
+
+	error = generic_segment_checks(iovp, &nr_segs, &ocount, VERIFY_READ);
 	if (error)
 		return error;
 
 	count = ocount;
-	pos = *offset;
-
 	if (count == 0)
 		return 0;
 
-	mp = xip->i_mount;
-
 	xfs_wait_for_freeze(mp, SB_FREEZE_WRITE);
 
 	if (XFS_FORCED_SHUTDOWN(mp))
@@ -535,30 +550,30 @@ relock:
 		mutex_lock(&inode->i_mutex);
 	}
 
-	xfs_ilock(xip, XFS_ILOCK_EXCL|iolock);
+	xfs_ilock(ip, XFS_ILOCK_EXCL|iolock);
 
 start:
 	error = -generic_write_checks(file, &pos, &count,
 					S_ISBLK(inode->i_mode));
 	if (error) {
-		xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock);
+		xfs_iunlock(ip, XFS_ILOCK_EXCL|iolock);
 		goto out_unlock_mutex;
 	}
 
-	if ((DM_EVENT_ENABLED(xip, DM_EVENT_WRITE) &&
+	if ((DM_EVENT_ENABLED(ip, DM_EVENT_WRITE) &&
 	    !(ioflags & IO_INVIS) && !eventsent)) {
 		int		dmflags = FILP_DELAY_FLAG(file);
 
 		if (need_i_mutex)
 			dmflags |= DM_FLAGS_IMUX;
 
-		xfs_iunlock(xip, XFS_ILOCK_EXCL);
-		error = XFS_SEND_DATA(xip->i_mount, DM_EVENT_WRITE, xip,
+		xfs_iunlock(ip, XFS_ILOCK_EXCL);
+		error = XFS_SEND_DATA(ip->i_mount, DM_EVENT_WRITE, ip,
 				      pos, count, dmflags, &iolock);
 		if (error) {
 			goto out_unlock_internal;
 		}
-		xfs_ilock(xip, XFS_ILOCK_EXCL);
+		xfs_ilock(ip, XFS_ILOCK_EXCL);
 		eventsent = 1;
 
 		/*
@@ -568,33 +583,33 @@ start:
 		 * event prevents another call to XFS_SEND_DATA, which is
 		 * what allows the size to change in the first place.
 		 */
-		if ((file->f_flags & O_APPEND) && pos != xip->i_size)
+		if ((file->f_flags & O_APPEND) && pos != ip->i_size)
 			goto start;
 	}
 
 	if (ioflags & IO_ISDIRECT) {
 		xfs_buftarg_t	*target =
-			XFS_IS_REALTIME_INODE(xip) ?
+			XFS_IS_REALTIME_INODE(ip) ?
 				mp->m_rtdev_targp : mp->m_ddev_targp;
 
 		if ((pos & target->bt_smask) || (count & target->bt_smask)) {
-			xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock);
+			xfs_iunlock(ip, XFS_ILOCK_EXCL|iolock);
 			return XFS_ERROR(-EINVAL);
 		}
 
-		if (!need_i_mutex && (mapping->nrpages || pos > xip->i_size)) {
-			xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock);
+		if (!need_i_mutex && (mapping->nrpages || pos > ip->i_size)) {
+			xfs_iunlock(ip, XFS_ILOCK_EXCL|iolock);
 			iolock = XFS_IOLOCK_EXCL;
 			need_i_mutex = 1;
 			mutex_lock(&inode->i_mutex);
-			xfs_ilock(xip, XFS_ILOCK_EXCL|iolock);
+			xfs_ilock(ip, XFS_ILOCK_EXCL|iolock);
 			goto start;
 		}
 	}
 
 	new_size = pos + count;
-	if (new_size > xip->i_size)
-		xip->i_new_size = new_size;
+	if (new_size > ip->i_size)
+		ip->i_new_size = new_size;
 
 	if (likely(!(ioflags & IO_INVIS)))
 		file_update_time(file);
@@ -608,14 +623,14 @@ start:
 	 * to zero it out up to the new size.
 	 */
 
-	if (pos > xip->i_size) {
-		error = xfs_zero_eof(xip, pos, xip->i_size);
+	if (pos > ip->i_size) {
+		error = xfs_zero_eof(ip, pos, ip->i_size);
 		if (error) {
-			xfs_iunlock(xip, XFS_ILOCK_EXCL);
+			xfs_iunlock(ip, XFS_ILOCK_EXCL);
 			goto out_unlock_internal;
 		}
 	}
-	xfs_iunlock(xip, XFS_ILOCK_EXCL);
+	xfs_iunlock(ip, XFS_ILOCK_EXCL);
 
 	/*
 	 * If we're writing the file then make sure to clear the
@@ -633,7 +648,7 @@ start:
 	if ((ioflags & IO_ISDIRECT)) {
 		if (mapping->nrpages) {
 			WARN_ON(need_i_mutex == 0);
-			error = xfs_flushinval_pages(xip,
+			error = xfs_flushinval_pages(ip,
 					(pos & PAGE_CACHE_MASK),
 					-1, FI_REMAPF_LOCKED);
 			if (error)
@@ -642,16 +657,16 @@ start:
 
 		if (need_i_mutex) {
 			/* demote the lock now the cached pages are gone */
-			xfs_ilock_demote(xip, XFS_IOLOCK_EXCL);
+			xfs_ilock_demote(ip, XFS_IOLOCK_EXCL);
 			mutex_unlock(&inode->i_mutex);
 
 			iolock = XFS_IOLOCK_SHARED;
 			need_i_mutex = 0;
 		}
 
-		trace_xfs_file_direct_write(xip, count, *offset, ioflags);
+		trace_xfs_file_direct_write(ip, count, iocb->ki_pos, ioflags);
 		ret = generic_file_direct_write(iocb, iovp,
-				&segs, pos, offset, count, ocount);
+				&nr_segs, pos, &iocb->ki_pos, count, ocount);
 
 		/*
 		 * direct-io write to a hole: fall through to buffered I/O
@@ -664,7 +679,7 @@ start:
 			count -= ret;
 
 			ioflags &= ~IO_ISDIRECT;
-			xfs_iunlock(xip, iolock);
+			xfs_iunlock(ip, iolock);
 			goto relock;
 		}
 	} else {
@@ -672,15 +687,15 @@ start:
 		ssize_t ret2 = 0;
 
 write_retry:
-		trace_xfs_file_buffered_write(xip, count, *offset, ioflags);
-		ret2 = generic_file_buffered_write(iocb, iovp, segs,
-				pos, offset, count, ret);
+		trace_xfs_file_buffered_write(ip, count, iocb->ki_pos, ioflags);
+		ret2 = generic_file_buffered_write(iocb, iovp, nr_segs,
+				pos, &iocb->ki_pos, count, ret);
 		/*
 		 * if we just got an ENOSPC, flush the inode now we
 		 * aren't holding any page locks and retry *once*
 		 */
 		if (ret2 == -ENOSPC && !enospc) {
-			error = xfs_flush_pages(xip, 0, -1, 0, FI_NONE);
+			error = xfs_flush_pages(ip, 0, -1, 0, FI_NONE);
 			if (error)
 				goto out_unlock_internal;
 			enospc = 1;
@@ -692,27 +707,27 @@ write_retry:
 	current->backing_dev_info = NULL;
 
 	isize = i_size_read(inode);
-	if (unlikely(ret < 0 && ret != -EFAULT && *offset > isize))
-		*offset = isize;
+	if (unlikely(ret < 0 && ret != -EFAULT && iocb->ki_pos > isize))
+		iocb->ki_pos = isize;
 
-	if (*offset > xip->i_size) {
-		xfs_ilock(xip, XFS_ILOCK_EXCL);
-		if (*offset > xip->i_size)
-			xip->i_size = *offset;
-		xfs_iunlock(xip, XFS_ILOCK_EXCL);
+	if (iocb->ki_pos > ip->i_size) {
+		xfs_ilock(ip, XFS_ILOCK_EXCL);
+		if (iocb->ki_pos > ip->i_size)
+			ip->i_size = iocb->ki_pos;
+		xfs_iunlock(ip, XFS_ILOCK_EXCL);
 	}
 
 	if (ret == -ENOSPC &&
-	    DM_EVENT_ENABLED(xip, DM_EVENT_NOSPACE) && !(ioflags & IO_INVIS)) {
-		xfs_iunlock(xip, iolock);
+	    DM_EVENT_ENABLED(ip, DM_EVENT_NOSPACE) && !(ioflags & IO_INVIS)) {
+		xfs_iunlock(ip, iolock);
 		if (need_i_mutex)
 			mutex_unlock(&inode->i_mutex);
-		error = XFS_SEND_NAMESP(xip->i_mount, DM_EVENT_NOSPACE, xip,
-				DM_RIGHT_NULL, xip, DM_RIGHT_NULL, NULL, NULL,
+		error = XFS_SEND_NAMESP(ip->i_mount, DM_EVENT_NOSPACE, ip,
+				DM_RIGHT_NULL, ip, DM_RIGHT_NULL, NULL, NULL,
 				0, 0, 0); /* Delay flag intentionally  unused */
 		if (need_i_mutex)
 			mutex_lock(&inode->i_mutex);
-		xfs_ilock(xip, iolock);
+		xfs_ilock(ip, iolock);
 		if (error)
 			goto out_unlock_internal;
 		goto start;
@@ -729,7 +744,7 @@ write_retry:
 		loff_t end = pos + ret - 1;
 		int error2;
 
-		xfs_iunlock(xip, iolock);
+		xfs_iunlock(ip, iolock);
 		if (need_i_mutex)
 			mutex_unlock(&inode->i_mutex);
 
@@ -738,17 +753,17 @@ write_retry:
 			error = error2;
 		if (need_i_mutex)
 			mutex_lock(&inode->i_mutex);
-		xfs_ilock(xip, iolock);
+		xfs_ilock(ip, iolock);
 
-		error2 = xfs_fsync(xip);
+		error2 = xfs_fsync(ip);
 		if (!error)
 			error = error2;
 	}
 
  out_unlock_internal:
-	if (xip->i_new_size) {
-		xfs_ilock(xip, XFS_ILOCK_EXCL);
-		xip->i_new_size = 0;
+	if (ip->i_new_size) {
+		xfs_ilock(ip, XFS_ILOCK_EXCL);
+		ip->i_new_size = 0;
 		/*
 		 * If this was a direct or synchronous I/O that failed (such
 		 * as ENOSPC) then part of the I/O may have been written to
@@ -756,89 +771,17 @@ write_retry:
 		 * file size may have been adjusted beyond the in-memory file
 		 * size and now needs to be truncated back.
 		 */
-		if (xip->i_d.di_size > xip->i_size)
-			xip->i_d.di_size = xip->i_size;
-		xfs_iunlock(xip, XFS_ILOCK_EXCL);
+		if (ip->i_d.di_size > ip->i_size)
+			ip->i_d.di_size = ip->i_size;
+		xfs_iunlock(ip, XFS_ILOCK_EXCL);
 	}
-	xfs_iunlock(xip, iolock);
+	xfs_iunlock(ip, iolock);
  out_unlock_mutex:
 	if (need_i_mutex)
 		mutex_unlock(&inode->i_mutex);
 	return -error;
 }
 
-STATIC ssize_t
-xfs_file_aio_read(
-	struct kiocb		*iocb,
-	const struct iovec	*iov,
-	unsigned long		nr_segs,
-	loff_t			pos)
-{
-	struct file		*file = iocb->ki_filp;
-	int			ioflags = 0;
-
-	BUG_ON(iocb->ki_pos != pos);
-	if (unlikely(file->f_flags & O_DIRECT))
-		ioflags |= IO_ISDIRECT;
-	if (file->f_mode & FMODE_NOCMTIME)
-		ioflags |= IO_INVIS;
-	return xfs_read(XFS_I(file->f_path.dentry->d_inode), iocb, iov,
-				nr_segs, &iocb->ki_pos, ioflags);
-}
-
-STATIC ssize_t
-xfs_file_aio_write(
-	struct kiocb		*iocb,
-	const struct iovec	*iov,
-	unsigned long		nr_segs,
-	loff_t			pos)
-{
-	struct file		*file = iocb->ki_filp;
-	int			ioflags = 0;
-
-	BUG_ON(iocb->ki_pos != pos);
-	if (unlikely(file->f_flags & O_DIRECT))
-		ioflags |= IO_ISDIRECT;
-	if (file->f_mode & FMODE_NOCMTIME)
-		ioflags |= IO_INVIS;
-	return xfs_write(XFS_I(file->f_mapping->host), iocb, iov, nr_segs,
-				&iocb->ki_pos, ioflags);
-}
-
-STATIC ssize_t
-xfs_file_splice_read(
-	struct file		*infilp,
-	loff_t			*ppos,
-	struct pipe_inode_info	*pipe,
-	size_t			len,
-	unsigned int		flags)
-{
-	int			ioflags = 0;
-
-	if (infilp->f_mode & FMODE_NOCMTIME)
-		ioflags |= IO_INVIS;
-
-	return xfs_splice_read(XFS_I(infilp->f_path.dentry->d_inode),
-				   infilp, ppos, pipe, len, flags, ioflags);
-}
-
-STATIC ssize_t
-xfs_file_splice_write(
-	struct pipe_inode_info	*pipe,
-	struct file		*outfilp,
-	loff_t			*ppos,
-	size_t			len,
-	unsigned int		flags)
-{
-	int			ioflags = 0;
-
-	if (outfilp->f_mode & FMODE_NOCMTIME)
-		ioflags |= IO_INVIS;
-
-	return xfs_splice_write(XFS_I(outfilp->f_path.dentry->d_inode),
-				    pipe, outfilp, ppos, len, flags, ioflags);
-}
-
 STATIC int
 xfs_file_open(
 	struct inode	*inode,

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Re: [PATCH 2/4] [PATCH 2/4] xfs: remove wrappers for read/write file operations

[Dave Chinner]

On Mon, Feb 15, 2010 at 04:44:47AM -0500, Christoph Hellwig wrote:
> Currently the aio_read, aio_write, splice_read and splice_write file
> operations are divided into a low-level routine doing all the work and
> one that implements the Linux file operations and does minimal argument
> wrapping.  This is a leftover from the days of the vnode operations layer
> and can be removed to simplify the code a lot.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

One main issue I see:

....

> -ssize_t				/* bytes written, or (-) error */
> -xfs_write(
> -	struct xfs_inode	*xip,
> +STATIC ssize_t
> +xfs_file_aio_write(
>  	struct kiocb		*iocb,
>  	const struct iovec	*iovp,
> -	unsigned int		nsegs,
> -	loff_t			*offset,
> -	int			ioflags)
> +	unsigned long		nr_segs,
> +	loff_t			pos)
>  {
>  	struct file		*file = iocb->ki_filp;
>  	struct address_space	*mapping = file->f_mapping;
>  	struct inode		*inode = mapping->host;
> -	unsigned long		segs = nsegs;
> -	xfs_mount_t		*mp;
> +	struct xfs_inode	*ip = XFS_I(inode);
> +	struct xfs_mount	*mp = ip->i_mount;
>  	ssize_t			ret = 0, error = 0;
> +	int			ioflags = 0;
>  	xfs_fsize_t		isize, new_size;
>  	int			iolock;
>  	int			eventsent = 0;
>  	size_t			ocount = 0, count;
> -	loff_t			pos;
>  	int			need_i_mutex;
>  
>  	XFS_STATS_INC(xs_write_calls);
>  
> -	error = generic_segment_checks(iovp, &segs, &ocount, VERIFY_READ);
> +	BUG_ON(iocb->ki_pos != pos);

You've changed a local variable "pos" which had the value
iocb->ki_pos to a function parameter of the same name which has a
different value.  Given this, all the existing uses of "pos" in this
function need to be converted to "iocb->ki_pos" as the old
xfs_write() never saw the original "pos" variable passed to
xfs_file_aio_write().

.....

> @@ -535,30 +550,30 @@ relock:
>  		mutex_lock(&inode->i_mutex);
>  	}
>  
> -	xfs_ilock(xip, XFS_ILOCK_EXCL|iolock);
> +	xfs_ilock(ip, XFS_ILOCK_EXCL|iolock);
>  
>  start:
>  	error = -generic_write_checks(file, &pos, &count,
>  					S_ISBLK(inode->i_mode));

Such as here. Actually, I'm surprised the compiler let you take
the address of a function parameter considering parameters may be
passed in registers....

>  	if (error) {
> -		xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock);
> +		xfs_iunlock(ip, XFS_ILOCK_EXCL|iolock);
>  		goto out_unlock_mutex;
>  	}
>  
> -	if ((DM_EVENT_ENABLED(xip, DM_EVENT_WRITE) &&
> +	if ((DM_EVENT_ENABLED(ip, DM_EVENT_WRITE) &&
>  	    !(ioflags & IO_INVIS) && !eventsent)) {
>  		int		dmflags = FILP_DELAY_FLAG(file);
>  
>  		if (need_i_mutex)
>  			dmflags |= DM_FLAGS_IMUX;
>  
> -		xfs_iunlock(xip, XFS_ILOCK_EXCL);
> -		error = XFS_SEND_DATA(xip->i_mount, DM_EVENT_WRITE, xip,
> +		xfs_iunlock(ip, XFS_ILOCK_EXCL);
> +		error = XFS_SEND_DATA(ip->i_mount, DM_EVENT_WRITE, ip,
>  				      pos, count, dmflags, &iolock);

And here. There's lots of others that haven't been converted - can
you make sure you get them all?

> @@ -642,16 +657,16 @@ start:
>  
>  		if (need_i_mutex) {
>  			/* demote the lock now the cached pages are gone */
> -			xfs_ilock_demote(xip, XFS_IOLOCK_EXCL);
> +			xfs_ilock_demote(ip, XFS_IOLOCK_EXCL);
>  			mutex_unlock(&inode->i_mutex);
>  
>  			iolock = XFS_IOLOCK_SHARED;
>  			need_i_mutex = 0;
>  		}
>  
> -		trace_xfs_file_direct_write(xip, count, *offset, ioflags);
> +		trace_xfs_file_direct_write(ip, count, iocb->ki_pos, ioflags);
>  		ret = generic_file_direct_write(iocb, iovp,
> -				&segs, pos, offset, count, ocount);
> +				&nr_segs, pos, &iocb->ki_pos, count, ocount);

But you did convert some ;)

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com

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Re: [PATCH 2/4] [PATCH 2/4] xfs: remove wrappers for read/write file operations

[Christoph Hellwig]

On Wed, Feb 17, 2010 at 02:55:11PM +1100, Dave Chinner wrote:
> You've changed a local variable "pos" which had the value
> iocb->ki_pos to a function parameter of the same name which has a
> different value.  Given this, all the existing uses of "pos" in this
> function need to be converted to "iocb->ki_pos" as the old
> xfs_write() never saw the original "pos" variable passed to
> xfs_file_aio_write().

Oh, I should have explained this in more detail.  The aio_read/aio_write
ABI both has a pos argument and the file position in iocb->ki_pos.
They were added for allowing aio that does partial I/O in each method
call using retries, but we don't actually use the anywhere.  Thus these
two are always these same and we even enforce that with a

	BUG_ON(iocb->ki_pos != pos);

in the code (both old and new).  Now how does the old pos local variable
come in play?  The old code didn't want to pass the kiocb to the
low-level xfs-write function, but as want the offset it passes a pointer
to iocb->ki_pos, which is called offset.  We take a local copy of it
before we might start modifying it, which we call pos.  pos gets updated
early in generic_write_checks if this is an O_APPEND write, but
otherwise stays immutable and marks the position where this write
started, while iocb->ki_pos (aka the old offset) gets updated by
generic_file_direct_write / generic_file_buffered_write to the new
file position after the I/O was done.

> Such as here. Actually, I'm surprised the compiler let you take
> the address of a function parameter considering parameters may be
> passed in registers....

Taking the address of arguments is perfectly valid in C, the only thing
you can't take addresses of are "register" variables.  This code is
the same as mm/filemap.c:__generic_file_aio_write, btw.

> > -		trace_xfs_file_direct_write(xip, count, *offset, ioflags);
> > +		trace_xfs_file_direct_write(ip, count, iocb->ki_pos, ioflags);
> >  		ret = generic_file_direct_write(iocb, iovp,
> > -				&segs, pos, offset, count, ocount);
> > +				&nr_segs, pos, &iocb->ki_pos, count, ocount);
> 
> But you did convert some ;)

I did carefull convert all offset references to ki->ki_pos, but all
uses of pos stay the same.

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Re: [PATCH 2/4] [PATCH 2/4] xfs: remove wrappers for read/write file operations

[Dave Chinner]

On Thu, Feb 18, 2010 at 08:13:55AM +1100, Dave Chinner wrote:
> On Wed, Feb 17, 2010 at 03:31:06AM -0500, Christoph Hellwig wrote:
> > On Wed, Feb 17, 2010 at 02:55:11PM +1100, Dave Chinner wrote:
> > > You've changed a local variable "pos" which had the value
> > > iocb->ki_pos to a function parameter of the same name which has a
> > > different value.  Given this, all the existing uses of "pos" in this
> > > function need to be converted to "iocb->ki_pos" as the old
> > > xfs_write() never saw the original "pos" variable passed to
> > > xfs_file_aio_write().
> > 
> > Oh, I should have explained this in more detail.  The aio_read/aio_write
> > ABI both has a pos argument and the file position in iocb->ki_pos.
> > They were added for allowing aio that does partial I/O in each method
> > call using retries, but we don't actually use the anywhere.  Thus these
> > two are always these same and we even enforce that with a
> > 
> > 	BUG_ON(iocb->ki_pos != pos);
> > 
> > in the code (both old and new).  Now how does the old pos local variable
> > come in play?  The old code didn't want to pass the kiocb to the
> > low-level xfs-write function, but as want the offset it passes a pointer
> > to iocb->ki_pos, which is called offset.  We take a local copy of it
> > before we might start modifying it, which we call pos.  pos gets updated
> > early in generic_write_checks if this is an O_APPEND write, but
> > otherwise stays immutable and marks the position where this write
> > started, while iocb->ki_pos (aka the old offset) gets updated by
> > generic_file_direct_write / generic_file_buffered_write to the new
> > file position after the I/O was done.
> 
> Ok, my misunderstanding. I'll go back and review it again with this
> in mind.

It looks ok having taken this into account. I think I originally
read the BUG_ON(iocb->ki_pos != pos) as meaning the two values were
not equivalent because that is what an ASSERT(iocb->ki_pos != pos)
would mean. Anyway:

Reviewed-by: Dave Chinner <david@fromorbit.com>

-- 
Dave Chinner
david@fromorbit.com

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Re: [PATCH 2/4] [PATCH 2/4] xfs: remove wrappers for read/write file operations

[Alex Elder]

On Wed, 2010-02-17 at 03:31 -0500, Christoph Hellwig wrote:
> On Wed, Feb 17, 2010 at 02:55:11PM +1100, Dave Chinner wrote:
> > You've changed a local variable "pos" which had the value
> > iocb->ki_pos to a function parameter of the same name which has a
> > different value.  Given this, all the existing uses of "pos" in this
> > function need to be converted to "iocb->ki_pos" as the old
> > xfs_write() never saw the original "pos" variable passed to
> > xfs_file_aio_write().

I think the simplest explanation is that previously, the value
of "offset" passed in is simply &iocb->ki_pos, and Christoph's
changes are then simply replacing "*offset" with "iocb->ki_pos".

In any case, I'm convinced the old is equivalent to the new...

					-Alex

> Oh, I should have explained this in more detail.  The aio_read/aio_write
> ABI both has a pos argument and the file position in iocb->ki_pos.
> They were added for allowing aio that does partial I/O in each method
> call using retries, but we don't actually use the anywhere.  Thus these
> two are always these same and we even enforce that with a
> 
> 	BUG_ON(iocb->ki_pos != pos);
> 
> in the code (both old and new).  Now how does the old pos local variable
> come in play?  The old code didn't want to pass the kiocb to the
> low-level xfs-write function, but as want the offset it passes a pointer
> to iocb->ki_pos, which is called offset.  We take a local copy of it
> before we might start modifying it, which we call pos.  pos gets updated
> early in generic_write_checks if this is an O_APPEND write, but
> otherwise stays immutable and marks the position where this write
> started, while iocb->ki_pos (aka the old offset) gets updated by
> generic_file_direct_write / generic_file_buffered_write to the new
> file position after the I/O was done.
> 
> > Such as here. Actually, I'm surprised the compiler let you take
> > the address of a function parameter considering parameters may be
> > passed in registers....
> 
> Taking the address of arguments is perfectly valid in C, the only thing
> you can't take addresses of are "register" variables.  This code is
> the same as mm/filemap.c:__generic_file_aio_write, btw.
> 
> > > -		trace_xfs_file_direct_write(xip, count, *offset, ioflags);
> > > +		trace_xfs_file_direct_write(ip, count, iocb->ki_pos, ioflags);
> > >  		ret = generic_file_direct_write(iocb, iovp,
> > > -				&segs, pos, offset, count, ocount);
> > > +				&nr_segs, pos, &iocb->ki_pos, count, ocount);
> > 
> > But you did convert some ;)
> 
> I did carefull convert all offset references to ki->ki_pos, but all
> uses of pos stay the same.
> 
> _______________________________________________
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> xfs@oss.sgi.com
> http://oss.sgi.com/mailman/listinfo/xfs



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[PATCH 3/4] [PATCH 3/4] xfs: remove wrapper for the fsync file operation

[Christoph Hellwig]

[-- Attachment #1: xfs-fsync-cleanup --]
[-- Type: text/plain, Size: 10421 bytes --]

Currently the fsync file operation is divided into a low-level routine doing
all the work and one that implements the Linux file operation and does minimal
argument wrapping.  This is a leftover from the days of the vnode operations
layer and can be removed to simplify the code a bit, as well as preparing for
the implementation of an optimized fdatasync which needs to look at the
Linux inode state.

Signed-off-by: Christoph Hellwig <hch@lst.de>

Index: xfs/fs/xfs/linux-2.6/xfs_file.c
===================================================================
--- xfs.orig/fs/xfs/linux-2.6/xfs_file.c	2010-02-15 10:18:58.640023657 +0100
+++ xfs/fs/xfs/linux-2.6/xfs_file.c	2010-02-15 10:28:07.311260422 +0100
@@ -35,6 +35,7 @@
 #include "xfs_dir2_sf.h"
 #include "xfs_dinode.h"
 #include "xfs_inode.h"
+#include "xfs_inode_item.h"
 #include "xfs_bmap.h"
 #include "xfs_error.h"
 #include "xfs_rw.h"
@@ -96,6 +97,120 @@ xfs_iozero(
 	return (-status);
 }
 
+/*
+ * We ignore the datasync flag here because a datasync is effectively
+ * identical to an fsync. That is, datasync implies that we need to write
+ * only the metadata needed to be able to access the data that is written
+ * if we crash after the call completes. Hence if we are writing beyond
+ * EOF we have to log the inode size change as well, which makes it a
+ * full fsync. If we don't write beyond EOF, the inode core will be
+ * clean in memory and so we don't need to log the inode, just like
+ * fsync.
+ */
+STATIC int
+xfs_file_fsync(
+	struct file		*file,
+	struct dentry		*dentry,
+	int			datasync)
+{
+	struct xfs_inode	*ip = XFS_I(dentry->d_inode);
+	struct xfs_trans	*tp;
+	int			error = 0;
+	int			log_flushed = 0;
+
+	xfs_itrace_entry(ip);
+
+	if (XFS_FORCED_SHUTDOWN(ip->i_mount))
+		return -XFS_ERROR(EIO);
+
+	xfs_iflags_clear(ip, XFS_ITRUNCATED);
+
+	/*
+	 * We always need to make sure that the required inode state is safe on
+	 * disk.  The inode might be clean but we still might need to force the
+	 * log because of committed transactions that haven't hit the disk yet.
+	 * Likewise, there could be unflushed non-transactional changes to the
+	 * inode core that have to go to disk and this requires us to issue
+	 * a synchronous transaction to capture these changes correctly.
+	 *
+	 * This code relies on the assumption that if the i_update_core field
+	 * of the inode is clear and the inode is unpinned then it is clean
+	 * and no action is required.
+	 */
+	xfs_ilock(ip, XFS_ILOCK_SHARED);
+
+	if (ip->i_update_core) {
+		/*
+		 * Kick off a transaction to log the inode core to get the
+		 * updates.  The sync transaction will also force the log.
+		 */
+		xfs_iunlock(ip, XFS_ILOCK_SHARED);
+		tp = xfs_trans_alloc(ip->i_mount, XFS_TRANS_FSYNC_TS);
+		error = xfs_trans_reserve(tp, 0,
+				XFS_FSYNC_TS_LOG_RES(ip->i_mount), 0, 0, 0);
+		if (error) {
+			xfs_trans_cancel(tp, 0);
+			return -error;
+		}
+		xfs_ilock(ip, XFS_ILOCK_EXCL);
+
+		/*
+		 * Note - it's possible that we might have pushed ourselves out
+		 * of the way during trans_reserve which would flush the inode.
+		 * But there's no guarantee that the inode buffer has actually
+		 * gone out yet (it's delwri).	Plus the buffer could be pinned
+		 * anyway if it's part of an inode in another recent
+		 * transaction.	 So we play it safe and fire off the
+		 * transaction anyway.
+		 */
+		xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
+		xfs_trans_ihold(tp, ip);
+		xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+		xfs_trans_set_sync(tp);
+		error = _xfs_trans_commit(tp, 0, &log_flushed);
+
+		xfs_iunlock(ip, XFS_ILOCK_EXCL);
+	} else {
+		/*
+		 * Timestamps/size haven't changed since last inode flush or
+		 * inode transaction commit.  That means either nothing got
+		 * written or a transaction committed which caught the updates.
+		 * If the latter happened and the transaction hasn't hit the
+		 * disk yet, the inode will be still be pinned.  If it is,
+		 * force the log.
+		 */
+		xfs_iunlock(ip, XFS_ILOCK_SHARED);
+		if (xfs_ipincount(ip)) {
+			if (ip->i_itemp->ili_last_lsn) {
+				error = _xfs_log_force_lsn(ip->i_mount,
+						ip->i_itemp->ili_last_lsn,
+						XFS_LOG_SYNC, &log_flushed);
+			} else {
+				error = _xfs_log_force(ip->i_mount,
+						XFS_LOG_SYNC, &log_flushed);
+			}
+		}
+	}
+
+	if (ip->i_mount->m_flags & XFS_MOUNT_BARRIER) {
+		/*
+		 * If the log write didn't issue an ordered tag we need
+		 * to flush the disk cache for the data device now.
+		 */
+		if (!log_flushed)
+			xfs_blkdev_issue_flush(ip->i_mount->m_ddev_targp);
+
+		/*
+		 * If this inode is on the RT dev we need to flush that
+		 * cache as well.
+		 */
+		if (XFS_IS_REALTIME_INODE(ip))
+			xfs_blkdev_issue_flush(ip->i_mount->m_rtdev_targp);
+	}
+
+	return -error;
+}
+
 STATIC ssize_t
 xfs_file_aio_read(
 	struct kiocb		*iocb,
@@ -755,7 +870,8 @@ write_retry:
 			mutex_lock(&inode->i_mutex);
 		xfs_ilock(ip, iolock);
 
-		error2 = xfs_fsync(ip);
+		error2 = -xfs_file_fsync(file, file->f_path.dentry,
+					 (file->f_flags & __O_SYNC) ? 0 : 1);
 		if (!error)
 			error = error2;
 	}
@@ -826,28 +942,6 @@ xfs_file_release(
 	return -xfs_release(XFS_I(inode));
 }
 
-/*
- * We ignore the datasync flag here because a datasync is effectively
- * identical to an fsync. That is, datasync implies that we need to write
- * only the metadata needed to be able to access the data that is written
- * if we crash after the call completes. Hence if we are writing beyond
- * EOF we have to log the inode size change as well, which makes it a
- * full fsync. If we don't write beyond EOF, the inode core will be
- * clean in memory and so we don't need to log the inode, just like
- * fsync.
- */
-STATIC int
-xfs_file_fsync(
-	struct file		*file,
-	struct dentry		*dentry,
-	int			datasync)
-{
-	struct xfs_inode	*ip = XFS_I(dentry->d_inode);
-
-	xfs_iflags_clear(ip, XFS_ITRUNCATED);
-	return -xfs_fsync(ip);
-}
-
 STATIC int
 xfs_file_readdir(
 	struct file	*filp,
Index: xfs/fs/xfs/xfs_vnodeops.c
===================================================================
--- xfs.orig/fs/xfs/xfs_vnodeops.c	2010-02-15 10:18:58.647025822 +0100
+++ xfs/fs/xfs/xfs_vnodeops.c	2010-02-15 10:21:33.365253716 +0100
@@ -584,113 +584,6 @@ xfs_readlink(
 }
 
 /*
- * xfs_fsync
- *
- * This is called to sync the inode and its data out to disk.  We need to hold
- * the I/O lock while flushing the data, and the inode lock while flushing the
- * inode.  The inode lock CANNOT be held while flushing the data, so acquire
- * after we're done with that.
- */
-int
-xfs_fsync(
-	xfs_inode_t	*ip)
-{
-	xfs_trans_t	*tp;
-	int		error = 0;
-	int		log_flushed = 0;
-
-	xfs_itrace_entry(ip);
-
-	if (XFS_FORCED_SHUTDOWN(ip->i_mount))
-		return XFS_ERROR(EIO);
-
-	/*
-	 * We always need to make sure that the required inode state is safe on
-	 * disk.  The inode might be clean but we still might need to force the
-	 * log because of committed transactions that haven't hit the disk yet.
-	 * Likewise, there could be unflushed non-transactional changes to the
-	 * inode core that have to go to disk and this requires us to issue
-	 * a synchronous transaction to capture these changes correctly.
-	 *
-	 * This code relies on the assumption that if the update_* fields
-	 * of the inode are clear and the inode is unpinned then it is clean
-	 * and no action is required.
-	 */
-	xfs_ilock(ip, XFS_ILOCK_SHARED);
-
-	if (!ip->i_update_core) {
-		/*
-		 * Timestamps/size haven't changed since last inode flush or
-		 * inode transaction commit.  That means either nothing got
-		 * written or a transaction committed which caught the updates.
-		 * If the latter happened and the transaction hasn't hit the
-		 * disk yet, the inode will be still be pinned.  If it is,
-		 * force the log.
-		 */
-		xfs_iunlock(ip, XFS_ILOCK_SHARED);
-		if (xfs_ipincount(ip)) {
-			if (ip->i_itemp->ili_last_lsn) {
-				error = _xfs_log_force_lsn(ip->i_mount,
-						ip->i_itemp->ili_last_lsn,
-						XFS_LOG_SYNC, &log_flushed);
-			} else {
-				error = _xfs_log_force(ip->i_mount,
-						XFS_LOG_SYNC, &log_flushed);
-			}
-		}
-	} else	{
-		/*
-		 * Kick off a transaction to log the inode core to get the
-		 * updates.  The sync transaction will also force the log.
-		 */
-		xfs_iunlock(ip, XFS_ILOCK_SHARED);
-		tp = xfs_trans_alloc(ip->i_mount, XFS_TRANS_FSYNC_TS);
-		error = xfs_trans_reserve(tp, 0,
-				XFS_FSYNC_TS_LOG_RES(ip->i_mount), 0, 0, 0);
-		if (error) {
-			xfs_trans_cancel(tp, 0);
-			return error;
-		}
-		xfs_ilock(ip, XFS_ILOCK_EXCL);
-
-		/*
-		 * Note - it's possible that we might have pushed ourselves out
-		 * of the way during trans_reserve which would flush the inode.
-		 * But there's no guarantee that the inode buffer has actually
-		 * gone out yet (it's delwri).	Plus the buffer could be pinned
-		 * anyway if it's part of an inode in another recent
-		 * transaction.	 So we play it safe and fire off the
-		 * transaction anyway.
-		 */
-		xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
-		xfs_trans_ihold(tp, ip);
-		xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
-		xfs_trans_set_sync(tp);
-		error = _xfs_trans_commit(tp, 0, &log_flushed);
-
-		xfs_iunlock(ip, XFS_ILOCK_EXCL);
-	}
-
-	if (ip->i_mount->m_flags & XFS_MOUNT_BARRIER) {
-		/*
-		 * If the log write didn't issue an ordered tag we need
-		 * to flush the disk cache for the data device now.
-		 */
-		if (!log_flushed)
-			xfs_blkdev_issue_flush(ip->i_mount->m_ddev_targp);
-
-		/*
-		 * If this inode is on the RT dev we need to flush that
-		 * cache as well.
-		 */
-		if (XFS_IS_REALTIME_INODE(ip))
-			xfs_blkdev_issue_flush(ip->i_mount->m_rtdev_targp);
-	}
-
-	return error;
-}
-
-/*
  * Flags for xfs_free_eofblocks
  */
 #define XFS_FREE_EOF_TRYLOCK	(1<<0)
Index: xfs/fs/xfs/xfs_vnodeops.h
===================================================================
--- xfs.orig/fs/xfs/xfs_vnodeops.h	2010-02-15 10:18:58.668254206 +0100
+++ xfs/fs/xfs/xfs_vnodeops.h	2010-02-15 10:21:33.379012621 +0100
@@ -21,7 +21,6 @@ int xfs_setattr(struct xfs_inode *ip, st
 #define XFS_ATTR_NOACL		0x08	/* Don't call xfs_acl_chmod */
 
 int xfs_readlink(struct xfs_inode *ip, char *link);
-int xfs_fsync(struct xfs_inode *ip);
 int xfs_release(struct xfs_inode *ip);
 int xfs_inactive(struct xfs_inode *ip);
 int xfs_lookup(struct xfs_inode *dp, struct xfs_name *name,

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Re: [PATCH 3/4] [PATCH 3/4] xfs: remove wrapper for the fsync file operation

[Dave Chinner]

On Mon, Feb 15, 2010 at 04:44:48AM -0500, Christoph Hellwig wrote:
> Currently the fsync file operation is divided into a low-level routine doing
> all the work and one that implements the Linux file operation and does minimal
> argument wrapping.  This is a leftover from the days of the vnode operations
> layer and can be removed to simplify the code a bit, as well as preparing for
> the implementation of an optimized fdatasync which needs to look at the
> Linux inode state.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Looks good, one minor thing:

> 
> Index: xfs/fs/xfs/linux-2.6/xfs_file.c
> ===================================================================
> --- xfs.orig/fs/xfs/linux-2.6/xfs_file.c	2010-02-15 10:18:58.640023657 +0100
> +++ xfs/fs/xfs/linux-2.6/xfs_file.c	2010-02-15 10:28:07.311260422 +0100
> @@ -35,6 +35,7 @@
>  #include "xfs_dir2_sf.h"
>  #include "xfs_dinode.h"
>  #include "xfs_inode.h"
> +#include "xfs_inode_item.h"
>  #include "xfs_bmap.h"
>  #include "xfs_error.h"
>  #include "xfs_rw.h"
> @@ -96,6 +97,120 @@ xfs_iozero(
>  	return (-status);
>  }
>  
> +/*
> + * We ignore the datasync flag here because a datasync is effectively
> + * identical to an fsync. That is, datasync implies that we need to write
> + * only the metadata needed to be able to access the data that is written
> + * if we crash after the call completes. Hence if we are writing beyond
> + * EOF we have to log the inode size change as well, which makes it a
> + * full fsync. If we don't write beyond EOF, the inode core will be
> + * clean in memory and so we don't need to log the inode, just like
> + * fsync.
> + */
> +STATIC int
> +xfs_file_fsync(
> +	struct file		*file,
> +	struct dentry		*dentry,
> +	int			datasync)
> +{
> +	struct xfs_inode	*ip = XFS_I(dentry->d_inode);
> +	struct xfs_trans	*tp;
> +	int			error = 0;
> +	int			log_flushed = 0;
> +
> +	xfs_itrace_entry(ip);
> +
> +	if (XFS_FORCED_SHUTDOWN(ip->i_mount))
> +		return -XFS_ERROR(EIO);
> +
> +	xfs_iflags_clear(ip, XFS_ITRUNCATED);
> +
> +	/*
> +	 * We always need to make sure that the required inode state is safe on
> +	 * disk.  The inode might be clean but we still might need to force the
> +	 * log because of committed transactions that haven't hit the disk yet.
> +	 * Likewise, there could be unflushed non-transactional changes to the
> +	 * inode core that have to go to disk and this requires us to issue
> +	 * a synchronous transaction to capture these changes correctly.
> +	 *
> +	 * This code relies on the assumption that if the i_update_core field
> +	 * of the inode is clear and the inode is unpinned then it is clean
> +	 * and no action is required.
> +	 */
> +	xfs_ilock(ip, XFS_ILOCK_SHARED);
> +
> +	if (ip->i_update_core) {
> +		/*
> +		 * Kick off a transaction to log the inode core to get the
> +		 * updates.  The sync transaction will also force the log.
> +		 */
> +		xfs_iunlock(ip, XFS_ILOCK_SHARED);
> +		tp = xfs_trans_alloc(ip->i_mount, XFS_TRANS_FSYNC_TS);
> +		error = xfs_trans_reserve(tp, 0,
> +				XFS_FSYNC_TS_LOG_RES(ip->i_mount), 0, 0, 0);
> +		if (error) {
> +			xfs_trans_cancel(tp, 0);
> +			return -error;
> +		}
> +		xfs_ilock(ip, XFS_ILOCK_EXCL);
> +
> +		/*
> +		 * Note - it's possible that we might have pushed ourselves out
> +		 * of the way during trans_reserve which would flush the inode.
> +		 * But there's no guarantee that the inode buffer has actually
> +		 * gone out yet (it's delwri).	Plus the buffer could be pinned
> +		 * anyway if it's part of an inode in another recent
> +		 * transaction.	 So we play it safe and fire off the
> +		 * transaction anyway.
> +		 */
> +		xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
> +		xfs_trans_ihold(tp, ip);
> +		xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
> +		xfs_trans_set_sync(tp);
> +		error = _xfs_trans_commit(tp, 0, &log_flushed);
> +
> +		xfs_iunlock(ip, XFS_ILOCK_EXCL);
> +	} else {
> +		/*
> +		 * Timestamps/size haven't changed since last inode flush or
> +		 * inode transaction commit.  That means either nothing got
> +		 * written or a transaction committed which caught the updates.
> +		 * If the latter happened and the transaction hasn't hit the
> +		 * disk yet, the inode will be still be pinned.  If it is,
> +		 * force the log.
> +		 */
> +		xfs_iunlock(ip, XFS_ILOCK_SHARED);
> +		if (xfs_ipincount(ip)) {
> +			if (ip->i_itemp->ili_last_lsn) {
> +				error = _xfs_log_force_lsn(ip->i_mount,
> +						ip->i_itemp->ili_last_lsn,
> +						XFS_LOG_SYNC, &log_flushed);
> +			} else {
> +				error = _xfs_log_force(ip->i_mount,
> +						XFS_LOG_SYNC, &log_flushed);
> +			}
> +		}

To be technically correct, the ilock should be held over the
pincount check and log force, as is done in xfs_iunpin_wait().
That way we can guarantee the inode was correctly forced and not
unpinned between the unlock/check/log force being issued. I know
this is just a copy of the existing fsync code, but I think that
the existing code is wrong, too. ;)

Also, if the inode is pinned while we have it locked, then
ip->i_itemp->ili_last_lsn is guaranteed to be set as it is updated
in IOP_COMMITTING() which is called during transaction commit.

As it is, ili_last_lsn is never reset to zero after a transaction,
so i think the _xfs_log_force() branch will never be executed,
either.

Other than that, the change looks ok.

Cheers,

Dave.
-- 
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david@fromorbit.com

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Re: [PATCH 3/4] [PATCH 3/4] xfs: remove wrapper for the fsync file operation

[Christoph Hellwig]

On Wed, Feb 17, 2010 at 03:09:44PM +1100, Dave Chinner wrote:
> > +		xfs_iunlock(ip, XFS_ILOCK_SHARED);
> > +		if (xfs_ipincount(ip)) {
> > +			if (ip->i_itemp->ili_last_lsn) {
> > +				error = _xfs_log_force_lsn(ip->i_mount,
> > +						ip->i_itemp->ili_last_lsn,
> > +						XFS_LOG_SYNC, &log_flushed);
> > +			} else {
> > +				error = _xfs_log_force(ip->i_mount,
> > +						XFS_LOG_SYNC, &log_flushed);
> > +			}
> > +		}
> 
> To be technically correct, the ilock should be held over the
> pincount check and log force, as is done in xfs_iunpin_wait().
> That way we can guarantee the inode was correctly forced and not
> unpinned between the unlock/check/log force being issued. I know
> this is just a copy of the existing fsync code, but I think that
> the existing code is wrong, too. ;)

Yes, no changes to the code semantics here.  But that ipincount check
is a relatively recent addition from me, too - so thanks for the
slightly delayed review as the comment is absolutely correct.  I'll
prepare a patch for it

> Also, if the inode is pinned while we have it locked, then
> ip->i_itemp->ili_last_lsn is guaranteed to be set as it is updated
> in IOP_COMMITTING() which is called during transaction commit.
> 
> As it is, ili_last_lsn is never reset to zero after a transaction,
> so i think the _xfs_log_force() branch will never be executed,
> either.

True, the same also applies to __xfs_iunpit_wait, I'll look into
that in another patch.  This will also apply to Ben's nfsd
commit_metadata patch.

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[PATCH 4/4] [PATCH 4/4] xfs: implement optimized fdatasync

[Christoph Hellwig]

[-- Attachment #1: xfs-implement-fdatasync --]
[-- Type: text/plain, Size: 4033 bytes --]

Allow us to track the difference between timestamp and size updates by using
mark_inode_dirty from the I/O completion code, and checking the VFS inode
flags in xfs_file_fsync.

Signed-off-by: Christoph Hellwig <hch@lst.de>

Index: xfs/fs/xfs/linux-2.6/xfs_aops.c
===================================================================
--- xfs.orig/fs/xfs/linux-2.6/xfs_aops.c	2010-02-15 10:23:14.050003751 +0100
+++ xfs/fs/xfs/linux-2.6/xfs_aops.c	2010-02-15 10:23:28.407272435 +0100
@@ -187,7 +187,7 @@ xfs_setfilesize(
 	isize = xfs_ioend_new_eof(ioend);
 	if (isize) {
 		ip->i_d.di_size = isize;
-		xfs_mark_inode_dirty_sync(ip);
+		xfs_mark_inode_dirty(ip);
 	}
 
 	xfs_iunlock(ip, XFS_ILOCK_EXCL);
@@ -341,7 +341,7 @@ xfs_submit_ioend_bio(
 	 * but don't update the inode size until I/O completion.
 	 */
 	if (xfs_ioend_new_eof(ioend))
-		xfs_mark_inode_dirty_sync(XFS_I(ioend->io_inode));
+		xfs_mark_inode_dirty(XFS_I(ioend->io_inode));
 
 	submit_bio(wbc->sync_mode == WB_SYNC_ALL ?
 		   WRITE_SYNC_PLUG : WRITE, bio);
Index: xfs/fs/xfs/linux-2.6/xfs_file.c
===================================================================
--- xfs.orig/fs/xfs/linux-2.6/xfs_file.c	2010-02-15 10:23:25.212255603 +0100
+++ xfs/fs/xfs/linux-2.6/xfs_file.c	2010-02-15 10:26:34.946005568 +0100
@@ -97,16 +97,6 @@ xfs_iozero(
 	return (-status);
 }
 
-/*
- * We ignore the datasync flag here because a datasync is effectively
- * identical to an fsync. That is, datasync implies that we need to write
- * only the metadata needed to be able to access the data that is written
- * if we crash after the call completes. Hence if we are writing beyond
- * EOF we have to log the inode size change as well, which makes it a
- * full fsync. If we don't write beyond EOF, the inode core will be
- * clean in memory and so we don't need to log the inode, just like
- * fsync.
- */
 STATIC int
 xfs_file_fsync(
 	struct file		*file,
@@ -139,7 +129,18 @@ xfs_file_fsync(
 	 */
 	xfs_ilock(ip, XFS_ILOCK_SHARED);
 
-	if (ip->i_update_core) {
+	/*
+	 * First check if the VFS inode is marked dirty.  All the dirtying
+	 * of non-transactional updates no goes through mark_inode_dirty*,
+	 * which allows us to distinguish beteeen pure timestamp updates
+	 * and i_size updates which need to be caught for fdatasync.
+	 * After that also theck for the dirty state in the XFS inode, which
+	 * might gets cleared when the inode gets written out via the AIL
+	 * or xfs_iflush_cluster.
+	 */
+	if (((dentry->d_inode->i_state & I_DIRTY_DATASYNC) ||
+	    ((dentry->d_inode->i_state & I_DIRTY_SYNC) && !datasync)) &&
+	    ip->i_update_core) {
 		/*
 		 * Kick off a transaction to log the inode core to get the
 		 * updates.  The sync transaction will also force the log.
Index: xfs/fs/xfs/linux-2.6/xfs_iops.c
===================================================================
--- xfs.orig/fs/xfs/linux-2.6/xfs_iops.c	2010-02-15 10:23:14.069003332 +0100
+++ xfs/fs/xfs/linux-2.6/xfs_iops.c	2010-02-15 10:23:28.419024635 +0100
@@ -91,6 +91,16 @@ xfs_mark_inode_dirty_sync(
 		mark_inode_dirty_sync(inode);
 }
 
+void
+xfs_mark_inode_dirty(
+	xfs_inode_t	*ip)
+{
+	struct inode	*inode = VFS_I(ip);
+
+	if (!(inode->i_state & (I_WILL_FREE|I_FREEING|I_CLEAR)))
+		mark_inode_dirty(inode);
+}
+
 /*
  * Change the requested timestamp in the given inode.
  * We don't lock across timestamp updates, and we don't log them but
Index: xfs/fs/xfs/xfs_inode.h
===================================================================
--- xfs.orig/fs/xfs/xfs_inode.h	2010-02-15 10:23:14.079253157 +0100
+++ xfs/fs/xfs/xfs_inode.h	2010-02-15 10:23:28.424047333 +0100
@@ -480,6 +480,7 @@ void		xfs_lock_inodes(xfs_inode_t **, in
 void		xfs_lock_two_inodes(xfs_inode_t *, xfs_inode_t *, uint);
 
 void		xfs_synchronize_times(xfs_inode_t *);
+void		xfs_mark_inode_dirty(xfs_inode_t *);
 void		xfs_mark_inode_dirty_sync(xfs_inode_t *);
 
 #define IHOLD(ip) \

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Re: [PATCH 4/4] [PATCH 4/4] xfs: implement optimized fdatasync

[Dave Chinner]

On Mon, Feb 15, 2010 at 04:44:49AM -0500, Christoph Hellwig wrote:
> Allow us to track the difference between timestamp and size updates by using
> mark_inode_dirty from the I/O completion code, and checking the VFS inode
> flags in xfs_file_fsync.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Looks sane.

Reviewed-by: Dave Chinner <david@fromorbit.com>

Cheers,

Dave.
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Re: [PATCH 0/4] implement optimized fdatasync

[Andi Kleen]

Christoph Hellwig <hch@infradead.org> writes:

> This series implements a real fdatasync, that is one that is not
> simply identical to fdatasync, but one that skips logging the inode


... to fsync?

> if there are only timestamp updates.

-Andi

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Re: [PATCH 0/4] implement optimized fdatasync

[Christoph Hellwig]

On Mon, Feb 15, 2010 at 10:04:52PM +0100, Andi Kleen wrote:
> Christoph Hellwig <hch@infradead.org> writes:
> 
> > This series implements a real fdatasync, that is one that is not
> > simply identical to fdatasync, but one that skips logging the inode
> 
> 
> ... to fsync?

Yes, Chris Wedgwood also pointed this out privately already.

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