linux-ext4 - [Patch 4/13] Allow regular files to be preallocated on-disk.

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Date:	Tue, 24 Jul 2007 16:34:48 +0530
From:	Girish Shilamkar <girish@...sterfs.com>
To:	Ext4 Mailing List <linux-ext4@...r.kernel.org>
Cc:	Andreas Dilger <adilger@...sterfs.com>,
	Theodore Tso <tytso@....edu>
Subject: [Patch 4/13] Allow regular files to be preallocated on-disk.

Allow regular files to be preallocated on-disk up to the next multiple
of the system PAGE_SIZE without complaining about extra blocks.

Signed-off-by: Andreas Dilger <adilger@...sterfs.com>
Signed-off-by: Girish Shilamkar <girish@...sterfs.com>
Signed-off-by: Kalpak Shah <kalpak@...sterfs.com>

Index: e2fsprogs-1.40.1/e2fsck/pass1.c
===================================================================
--- e2fsprogs-1.40.1.orig/e2fsck/pass1.c
+++ e2fsprogs-1.40.1/e2fsck/pass1.c
@@ -1591,9 +1591,14 @@ static void check_blocks(e2fsck_t ctx, s
 				bad_size = 2;
 		}
 	} else {
+		e2_blkcnt_t blkpg = getpagesize() / fs->blocksize;
+
 		size = EXT2_I_SIZE(inode);
 		if ((pb.last_block >= 0) &&
-		    (size < (__u64) pb.last_block * fs->blocksize))
+		    /* allow allocated blocks to end of PAGE_SIZE */
+		    (size < (__u64)pb.last_block * fs->blocksize) &&
+		    (pb.last_block / blkpg * blkpg != pb.last_block ||
+		     size < (__u64)(pb.last_block & ~(blkpg-1)) *fs->blocksize))
 			bad_size = 3;
 		else if (size > ext2_max_sizes[fs->super->s_log_block_size])
 			bad_size = 4;


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