[XFS] Implement the di_extsize allocator hint for non-realtime files as

well.  Also provides a mechanism for inheriting this property from the
parent directory for new files.

SGI-PV: 945264
SGI-Modid: xfs-linux-melb:xfs-kern:24367a

Signed-off-by: Nathan Scott <nathans@sgi.com>

1 files changed, 211 insertions, 179 deletions

diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index 45a77a3..5ecf3e3 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -263,7 +263,7 @@ phase2:
 	case BMAPI_WRITE:
 		/* If we found an extent, return it */
 		if (nimaps &&
-		    (imap.br_startblock != HOLESTARTBLOCK) && 
+		    (imap.br_startblock != HOLESTARTBLOCK) &&
 		    (imap.br_startblock != DELAYSTARTBLOCK)) {
 			xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, io,
 					offset, count, iomapp, &imap, flags);
@@ -318,6 +318,58 @@ out:
 }
 
 STATIC int
+xfs_iomap_eof_align_last_fsb(
+	xfs_mount_t	*mp,
+	xfs_iocore_t	*io,
+	xfs_fsize_t	isize,
+	xfs_extlen_t	extsize,
+	xfs_fileoff_t	*last_fsb)
+{
+	xfs_fileoff_t	new_last_fsb = 0;
+	xfs_extlen_t	align;
+	int		eof, error;
+
+	if (io->io_flags & XFS_IOCORE_RT)
+		;
+	/*
+	 * If mounted with the "-o swalloc" option, roundup the allocation
+	 * request to a stripe width boundary if the file size is >=
+	 * stripe width and we are allocating past the allocation eof.
+	 */
+	else if (mp->m_swidth && (mp->m_flags & XFS_MOUNT_SWALLOC) &&
+	        (isize >= XFS_FSB_TO_B(mp, mp->m_swidth)))
+		new_last_fsb = roundup_64(*last_fsb, mp->m_swidth);
+	/*
+	 * Roundup the allocation request to a stripe unit (m_dalign) boundary
+	 * if the file size is >= stripe unit size, and we are allocating past
+	 * the allocation eof.
+	 */
+	else if (mp->m_dalign && (isize >= XFS_FSB_TO_B(mp, mp->m_dalign)))
+		new_last_fsb = roundup_64(*last_fsb, mp->m_dalign);
+
+	/*
+	 * Always round up the allocation request to an extent boundary
+	 * (when file on a real-time subvolume or has di_extsize hint).
+	 */
+	if (extsize) {
+		if (new_last_fsb)
+			align = roundup_64(new_last_fsb, extsize);
+		else
+			align = extsize;
+		new_last_fsb = roundup_64(*last_fsb, align);
+	}
+
+	if (new_last_fsb) {
+		error = XFS_BMAP_EOF(mp, io, new_last_fsb, XFS_DATA_FORK, &eof);
+		if (error)
+			return error;
+		if (eof)
+			*last_fsb = new_last_fsb;
+	}
+	return 0;
+}
+
+STATIC int
 xfs_flush_space(
 	xfs_inode_t	*ip,
 	int		*fsynced,
@@ -363,19 +415,20 @@ xfs_iomap_write_direct(
 	xfs_iocore_t	*io = &ip->i_iocore;
 	xfs_fileoff_t	offset_fsb;
 	xfs_fileoff_t	last_fsb;
-	xfs_filblks_t	count_fsb;
+	xfs_filblks_t	count_fsb, resaligned;
 	xfs_fsblock_t	firstfsb;
+	xfs_extlen_t	extsz, temp;
+	xfs_fsize_t	isize;
 	int		nimaps;
-	int		error;
 	int		bmapi_flag;
 	int		quota_flag;
 	int		rt;
 	xfs_trans_t	*tp;
 	xfs_bmbt_irec_t imap;
 	xfs_bmap_free_t free_list;
-	xfs_filblks_t	qblocks, resblks;
+	uint		qblocks, resblks, resrtextents;
 	int		committed;
-	int		resrtextents;
+	int		error;
 
 	/*
 	 * Make sure that the dquots are there. This doesn't hold
@@ -385,37 +438,52 @@ xfs_iomap_write_direct(
 	if (error)
 		return XFS_ERROR(error);
 
-	offset_fsb = XFS_B_TO_FSBT(mp, offset);
-	last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
-	count_fsb = last_fsb - offset_fsb;
-	if (found && (ret_imap->br_startblock == HOLESTARTBLOCK)) {
-		xfs_fileoff_t	map_last_fsb;
-
-		map_last_fsb = ret_imap->br_blockcount + ret_imap->br_startoff;
-		if (map_last_fsb < last_fsb) {
-			last_fsb = map_last_fsb;
-			count_fsb = last_fsb - offset_fsb;
-		}
-		ASSERT(count_fsb > 0);
+	rt = XFS_IS_REALTIME_INODE(ip);
+	if (unlikely(rt)) {
+		if (!(extsz = ip->i_d.di_extsize))
+			extsz = mp->m_sb.sb_rextsize;
+	} else {
+		extsz = ip->i_d.di_extsize;
 	}
 
-	/*
-	 * Determine if reserving space on the data or realtime partition.
-	 */
-	if ((rt = XFS_IS_REALTIME_INODE(ip))) {
-		xfs_extlen_t	extsz;
+	isize = ip->i_d.di_size;
+	if (io->io_new_size > isize)
+		isize = io->io_new_size;
 
-		if (!(extsz = ip->i_d.di_extsize))
-			extsz = mp->m_sb.sb_rextsize;
-		resrtextents = qblocks = (count_fsb + extsz - 1);
-		do_div(resrtextents, mp->m_sb.sb_rextsize);
-		resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
-		quota_flag = XFS_QMOPT_RES_RTBLKS;
+  	offset_fsb = XFS_B_TO_FSBT(mp, offset);
+  	last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
+	if ((offset + count) > isize) {
+		error = xfs_iomap_eof_align_last_fsb(mp, io, isize, extsz,
+							&last_fsb);
+		if (error)
+			goto error_out;
 	} else {
-		resrtextents = 0;
-		resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, count_fsb);
-		quota_flag = XFS_QMOPT_RES_REGBLKS;
+		if (found && (ret_imap->br_startblock == HOLESTARTBLOCK))
+			last_fsb = MIN(last_fsb, (xfs_fileoff_t)
+					ret_imap->br_blockcount +
+					ret_imap->br_startoff);
 	}
+	count_fsb = last_fsb - offset_fsb;
+	ASSERT(count_fsb > 0);
+
+	resaligned = count_fsb;
+	if (unlikely(extsz)) {
+		if ((temp = do_mod(offset_fsb, extsz)))
+			resaligned += temp;
+		if ((temp = do_mod(resaligned, extsz)))
+			resaligned += extsz - temp;
+	}
+
+	if (unlikely(rt)) {
+		resrtextents = qblocks = resaligned;
+		resrtextents /= mp->m_sb.sb_rextsize;
+  		resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
+  		quota_flag = XFS_QMOPT_RES_RTBLKS;
+  	} else {
+  		resrtextents = 0;
+		resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resaligned);
+  		quota_flag = XFS_QMOPT_RES_REGBLKS;
+  	}
 
 	/*
 	 * Allocate and setup the transaction
@@ -426,7 +494,6 @@ xfs_iomap_write_direct(
 			XFS_WRITE_LOG_RES(mp), resrtextents,
 			XFS_TRANS_PERM_LOG_RES,
 			XFS_WRITE_LOG_COUNT);
-
 	/*
 	 * Check for running out of space, note: need lock to return
 	 */
@@ -436,20 +503,20 @@ xfs_iomap_write_direct(
 	if (error)
 		goto error_out;
 
-	if (XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip, qblocks, 0, quota_flag)) {
-		error = (EDQUOT);
+	error = XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip,
+					      qblocks, 0, quota_flag);
+	if (error)
 		goto error1;
-	}
 
-	bmapi_flag = XFS_BMAPI_WRITE;
 	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
 	xfs_trans_ihold(tp, ip);
 
-	if (!(flags & BMAPI_MMAP) && (offset < ip->i_d.di_size || rt))
+	bmapi_flag = XFS_BMAPI_WRITE;
+	if ((flags & BMAPI_DIRECT) && (offset < ip->i_d.di_size || extsz))
 		bmapi_flag |= XFS_BMAPI_PREALLOC;
 
 	/*
-	 * Issue the bmapi() call to allocate the blocks
+	 * Issue the xfs_bmapi() call to allocate the blocks
 	 */
 	XFS_BMAP_INIT(&free_list, &firstfsb);
 	nimaps = 1;
@@ -501,6 +568,62 @@ error_out:
 	return XFS_ERROR(error);
 }
 
+/*
+ * If the caller is doing a write at the end of the file,
+ * then extend the allocation out to the file system's write
+ * iosize.  We clean up any extra space left over when the
+ * file is closed in xfs_inactive().
+ *
+ * For sync writes, we are flushing delayed allocate space to
+ * try to make additional space available for allocation near
+ * the filesystem full boundary - preallocation hurts in that
+ * situation, of course.
+ */
+STATIC int
+xfs_iomap_eof_want_preallocate(
+	xfs_mount_t	*mp,
+	xfs_iocore_t	*io,
+	xfs_fsize_t	isize,
+	xfs_off_t	offset,
+	size_t		count,
+	int		ioflag,
+	xfs_bmbt_irec_t *imap,
+	int		nimaps,
+	int		*prealloc)
+{
+	xfs_fileoff_t   start_fsb;
+	xfs_filblks_t   count_fsb;
+	xfs_fsblock_t	firstblock;
+	int		n, error, imaps;
+
+	*prealloc = 0;
+	if ((ioflag & BMAPI_SYNC) || (offset + count) <= isize)
+		return 0;
+
+	/*
+	 * If there are any real blocks past eof, then don't
+	 * do any speculative allocation.
+	 */
+	start_fsb = XFS_B_TO_FSBT(mp, ((xfs_ufsize_t)(offset + count - 1)));
+	count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
+	while (count_fsb > 0) {
+		imaps = nimaps;
+		error = XFS_BMAPI(mp, NULL, io, start_fsb, count_fsb,
+				  0, &firstblock, 0, imap, &imaps, NULL);
+		if (error)
+			return error;
+		for (n = 0; n < imaps; n++) {
+			if ((imap[n].br_startblock != HOLESTARTBLOCK) &&
+			    (imap[n].br_startblock != DELAYSTARTBLOCK))
+				return 0;
+			start_fsb += imap[n].br_blockcount;
+			count_fsb -= imap[n].br_blockcount;
+		}
+	}
+	*prealloc = 1;
+	return 0;
+}
+
 int
 xfs_iomap_write_delay(
 	xfs_inode_t	*ip,
@@ -514,13 +637,15 @@ xfs_iomap_write_delay(
 	xfs_iocore_t	*io = &ip->i_iocore;
 	xfs_fileoff_t	offset_fsb;
 	xfs_fileoff_t	last_fsb;
-	xfs_fsize_t	isize;
+	xfs_off_t	aligned_offset;
+	xfs_fileoff_t	ioalign;
 	xfs_fsblock_t	firstblock;
+	xfs_extlen_t	extsz;
+	xfs_fsize_t	isize;
 	int		nimaps;
-	int		error;
 	xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS];
-	int		aeof;
-	int		fsynced = 0;
+	int		prealloc, fsynced = 0;
+	int		error;
 
 	ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE) != 0);
 
@@ -528,152 +653,57 @@ xfs_iomap_write_delay(
 	 * Make sure that the dquots are there. This doesn't hold
 	 * the ilock across a disk read.
 	 */
-
 	error = XFS_QM_DQATTACH(mp, ip, XFS_QMOPT_ILOCKED);
 	if (error)
 		return XFS_ERROR(error);
 
+	if (XFS_IS_REALTIME_INODE(ip)) {
+		if (!(extsz = ip->i_d.di_extsize))
+			extsz = mp->m_sb.sb_rextsize;
+	} else {
+		extsz = ip->i_d.di_extsize;
+	}
+
+	offset_fsb = XFS_B_TO_FSBT(mp, offset);
+
 retry:
 	isize = ip->i_d.di_size;
-	if (io->io_new_size > isize) {
+	if (io->io_new_size > isize)
 		isize = io->io_new_size;
-	}
 
-	aeof = 0;
-	offset_fsb = XFS_B_TO_FSBT(mp, offset);
-	last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
-	/*
-	 * If the caller is doing a write at the end of the file,
-	 * then extend the allocation (and the buffer used for the write)
-	 * out to the file system's write iosize.  We clean up any extra
-	 * space left over when the file is closed in xfs_inactive().
-	 *
-	 * For sync writes, we are flushing delayed allocate space to
-	 * try to make additional space available for allocation near
-	 * the filesystem full boundary - preallocation hurts in that
-	 * situation, of course.
-	 */
-	if (!(ioflag & BMAPI_SYNC) && ((offset + count) > ip->i_d.di_size)) {
-		xfs_off_t	aligned_offset;
-		xfs_filblks_t   count_fsb;
-		unsigned int	iosize;
-		xfs_fileoff_t	ioalign;
-		int		n;
-		xfs_fileoff_t   start_fsb;
+	error = xfs_iomap_eof_want_preallocate(mp, io, isize, offset, count,
+				ioflag, imap, XFS_WRITE_IMAPS, &prealloc);
+	if (error)
+		return error;
 
-		/*
-		 * If there are any real blocks past eof, then don't
-		 * do any speculative allocation.
-		 */
-		start_fsb = XFS_B_TO_FSBT(mp,
-					((xfs_ufsize_t)(offset + count - 1)));
-		count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
-		while (count_fsb > 0) {
-			nimaps = XFS_WRITE_IMAPS;
-			error = XFS_BMAPI(mp, NULL, io, start_fsb, count_fsb,
-					0, &firstblock, 0, imap, &nimaps, NULL);
-			if (error) {
-				return error;
-			}
-			for (n = 0; n < nimaps; n++) {
-				if ( !(io->io_flags & XFS_IOCORE_RT)  && 
-					!imap[n].br_startblock) {
-					cmn_err(CE_PANIC,"Access to block "
-						"zero:  fs <%s> inode: %lld "
-						"start_block : %llx start_off "
-						": %llx blkcnt : %llx "
-						"extent-state : %x \n",
-						(ip->i_mount)->m_fsname,
-						(long long)ip->i_ino,
-						imap[n].br_startblock,
-						imap[n].br_startoff,
-						imap[n].br_blockcount,
-						imap[n].br_state);
-        			}
-				if ((imap[n].br_startblock != HOLESTARTBLOCK) &&
-				    (imap[n].br_startblock != DELAYSTARTBLOCK)) {
-					goto write_map;
-				}
-				start_fsb += imap[n].br_blockcount;
-				count_fsb -= imap[n].br_blockcount;
-			}
-		}
-		iosize = mp->m_writeio_blocks;
+	if (prealloc) {
 		aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1));
 		ioalign = XFS_B_TO_FSBT(mp, aligned_offset);
-		last_fsb = ioalign + iosize;
-		aeof = 1;
+		last_fsb = ioalign + mp->m_writeio_blocks;
+	} else {
+		last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
 	}
-write_map:
-	nimaps = XFS_WRITE_IMAPS;
-	firstblock = NULLFSBLOCK;
 
-	/*
-	 * If mounted with the "-o swalloc" option, roundup the allocation
-	 * request to a stripe width boundary if the file size is >=
-	 * stripe width and we are allocating past the allocation eof.
-	 */
-	if (!(io->io_flags & XFS_IOCORE_RT) && mp->m_swidth 
-	    && (mp->m_flags & XFS_MOUNT_SWALLOC)
-	    && (isize >= XFS_FSB_TO_B(mp, mp->m_swidth)) && aeof) {
-		int eof;
-		xfs_fileoff_t new_last_fsb;
-
-		new_last_fsb = roundup_64(last_fsb, mp->m_swidth);
-		error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof);
-		if (error) {
-			return error;
-		}
-		if (eof) {
-			last_fsb = new_last_fsb;
-		}
-	/*
-	 * Roundup the allocation request to a stripe unit (m_dalign) boundary
-	 * if the file size is >= stripe unit size, and we are allocating past
-	 * the allocation eof.
-	 */
-	} else if (!(io->io_flags & XFS_IOCORE_RT) && mp->m_dalign &&
-		   (isize >= XFS_FSB_TO_B(mp, mp->m_dalign)) && aeof) {
-		int eof;
-		xfs_fileoff_t new_last_fsb;
-		new_last_fsb = roundup_64(last_fsb, mp->m_dalign);
-		error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof);
-		if (error) {
-			return error;
-		}
-		if (eof) {
-			last_fsb = new_last_fsb;
-		}
-	/*
-	 * Round up the allocation request to a real-time extent boundary
-	 * if the file is on the real-time subvolume.
-	 */
-	} else if (io->io_flags & XFS_IOCORE_RT && aeof) {
-		int eof;
-		xfs_fileoff_t new_last_fsb;
-
-		new_last_fsb = roundup_64(last_fsb, mp->m_sb.sb_rextsize);
-		error = XFS_BMAP_EOF(mp, io, new_last_fsb, XFS_DATA_FORK, &eof);
-		if (error) {
+	if (prealloc || extsz) {
+		error = xfs_iomap_eof_align_last_fsb(mp, io, isize, extsz,
+							&last_fsb);
+		if (error)
 			return error;
-		}
-		if (eof)
-			last_fsb = new_last_fsb;
 	}
+
+	nimaps = XFS_WRITE_IMAPS;
+	firstblock = NULLFSBLOCK;
 	error = xfs_bmapi(NULL, ip, offset_fsb,
 			  (xfs_filblks_t)(last_fsb - offset_fsb),
 			  XFS_BMAPI_DELAY | XFS_BMAPI_WRITE |
 			  XFS_BMAPI_ENTIRE, &firstblock, 1, imap,
 			  &nimaps, NULL);
-	/*
-	 * This can be EDQUOT, if nimaps == 0
-	 */
-	if (error && (error != ENOSPC)) {
+	if (error && (error != ENOSPC))
 		return XFS_ERROR(error);
-	}
+
 	/*
 	 * If bmapi returned us nothing, and if we didn't get back EDQUOT,
-	 * then we must have run out of space.
+	 * then we must have run out of space - flush delalloc, and retry..
 	 */
 	if (nimaps == 0) {
 		xfs_iomap_enter_trace(XFS_IOMAP_WRITE_NOSPACE,
@@ -685,9 +715,7 @@ write_map:
 		goto retry;
 	}
 
-	*ret_imap = imap[0];
-	*nmaps = 1;
-	if ( !(io->io_flags & XFS_IOCORE_RT)  && !ret_imap->br_startblock) {
+	if (!(io->io_flags & XFS_IOCORE_RT)  && !ret_imap->br_startblock) {
 		cmn_err(CE_PANIC,"Access to block zero:  fs <%s> inode: %lld "
                         "start_block : %llx start_off : %llx blkcnt : %llx "
                         "extent-state : %x \n",
@@ -696,6 +724,10 @@ write_map:
                         ret_imap->br_startblock, ret_imap->br_startoff,
                         ret_imap->br_blockcount,ret_imap->br_state);
 	}
+
+	*ret_imap = imap[0];
+	*nmaps = 1;
+
 	return 0;
 }
 
@@ -868,17 +900,17 @@ xfs_iomap_write_unwritten(
 {
 	xfs_mount_t	*mp = ip->i_mount;
 	xfs_iocore_t    *io = &ip->i_iocore;
-	xfs_trans_t	*tp;
 	xfs_fileoff_t	offset_fsb;
 	xfs_filblks_t	count_fsb;
 	xfs_filblks_t	numblks_fsb;
-	xfs_bmbt_irec_t	imap;
+	xfs_fsblock_t	firstfsb;
+	int		nimaps;
+	xfs_trans_t	*tp;
+	xfs_bmbt_irec_t imap;
+	xfs_bmap_free_t free_list;
+	uint		resblks;
 	int		committed;
 	int		error;
-	int		nres;
-	int		nimaps;
-	xfs_fsblock_t	firstfsb;
-	xfs_bmap_free_t	free_list;
 
 	xfs_iomap_enter_trace(XFS_IOMAP_UNWRITTEN,
 				&ip->i_iocore, offset, count);
@@ -887,9 +919,9 @@ xfs_iomap_write_unwritten(
 	count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
 	count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb);
 
-	do {
-		nres = XFS_DIOSTRAT_SPACE_RES(mp, 0);
+	resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1;
 
+	do {
 		/*
 		 * set up a transaction to convert the range of extents
 		 * from unwritten to real. Do allocations in a loop until
@@ -897,7 +929,7 @@ xfs_iomap_write_unwritten(
 		 */
 
 		tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE);
-		error = xfs_trans_reserve(tp, nres,
+		error = xfs_trans_reserve(tp, resblks,
 				XFS_WRITE_LOG_RES(mp), 0,
 				XFS_TRANS_PERM_LOG_RES,
 				XFS_WRITE_LOG_COUNT);
@@ -916,7 +948,7 @@ xfs_iomap_write_unwritten(
 		XFS_BMAP_INIT(&free_list, &firstfsb);
 		nimaps = 1;
 		error = xfs_bmapi(tp, ip, offset_fsb, count_fsb,
-				  XFS_BMAPI_WRITE, &firstfsb,
+				  XFS_BMAPI_WRITE|XFS_BMAPI_CONVERT, &firstfsb,
 				  1, &imap, &nimaps, &free_list);
 		if (error)
 			goto error_on_bmapi_transaction;
@@ -930,7 +962,7 @@ xfs_iomap_write_unwritten(
 		xfs_iunlock(ip, XFS_ILOCK_EXCL);
 		if (error)
 			goto error0;
-		
+
 		if ( !(io->io_flags & XFS_IOCORE_RT)  && !imap.br_startblock) {
 			cmn_err(CE_PANIC,"Access to block zero:  fs <%s> "
 				"inode: %lld start_block : %llx start_off : "