linux-ext4 - Re: [PATCH 15/15][e2fsprogs] 64-bit mke2fs cleanup

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Date:	Wed, 16 Jul 2008 17:13:31 +0200
From:	Goswin von Brederlow <goswin-v-b@....de>
To:	"Jose R. Santos" <jrs@...ibm.com>
Cc:	"Theodore Ts'o" <tytso@....edu>, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 15/15][e2fsprogs] 64-bit mke2fs cleanup

From: Goswin von Brederlow <goswin-v-b@....de>

Bring back overflow checks in mke2fs.c and remove dead code in
getsize.c

- ext2fs_get_device_size2() no longer returns EFBIG, the code path for
  it is dead. remove.

- Change code to check actual dev_size against 2^32.

- Check for EXT4_FEATURE_INCOMPAT_64BIT before bailing out with
  excessive size error.

- Move check, only check dev_size when it is actualy used. Not when
  overridden by command line args.

FIXME: check command line args for excessive size too.

Signed-off-by: Goswin von Brederlow <goswin-v-b@....de>
--

 lib/ext2fs/getsize.c |   15 ---------------
 misc/mke2fs.c        |   30 +++++++++++++++---------------
 2 files changed, 15 insertions(+), 30 deletions(-)

Index: e2fsprogs/misc/mke2fs.c
===================================================================
--- e2fsprogs.orig/misc/mke2fs.c	2008-07-16 15:59:48.000000000 +0200
+++ e2fsprogs/misc/mke2fs.c	2008-07-16 16:57:54.000000000 +0200
@@ -1410,21 +1410,6 @@ static void PRS(int argc, char *argv[])
 		retval = ext2fs_get_device_size2(device_name,
 						EXT2_BLOCK_SIZE(&fs_param),
 						&dev_size);
-		if ((retval == EFBIG) &&
-		    (blocksize == 0) && 
-		    (fs_param.s_log_block_size == 0)) {
-			fs_param.s_log_block_size = 2;
-			blocksize = 4096;
-			goto retry;
-		}
-	}
-			
-	if (retval == EFBIG) {
-		fprintf(stderr, _("%s: Size of device %s too big "
-				  "to be expressed in 32 bits\n\t"
-				  "using a blocksize of %d.\n"),
-			program_name, device_name, EXT2_BLOCK_SIZE(&fs_param));
-		exit(1);
 	}
 	if (retval && (retval != EXT2_ET_UNIMPLEMENTED)) {
 		com_err(program_name, retval,
@@ -1451,7 +1436,22 @@ static void PRS(int argc, char *argv[])
 				  ));
 				exit(1);
 			}
+			if ((dev_size >= 1LLU << 32) &&
+			    (blocksize == 0) &&
+			    (fs_param.s_log_block_size == 0)) {
+				fs_param.s_log_block_size = 2;
+				blocksize = 4096;
+				goto retry;
+			}
+			if (!(fs_param.s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT) && (dev_size >= 1ULL << 32)) {
+				fprintf(stderr, _("%s: Size of device %s too big "
+						  "to be expressed in 32 bits\n\t"
+						  "using a blocksize of %d.\n"),
+					program_name, device_name, EXT2_BLOCK_SIZE(&fs_param));
+				exit(1);
+			}
 			ext2fs_blocks_count_set(&fs_param, dev_size);
+fprintf(stderr, "blocks count = %llu\n", ext2fs_blocks_count(&fs_param));
 			if (sys_page_size > EXT2_BLOCK_SIZE(&fs_param)) {
 				blk64_t tmp = ext2fs_blocks_count(&fs_param);
 				tmp &= ~((sys_page_size /
Index: e2fsprogs/lib/ext2fs/getsize.c
===================================================================
--- e2fsprogs.orig/lib/ext2fs/getsize.c	2008-07-16 16:34:58.000000000 +0200
+++ e2fsprogs/lib/ext2fs/getsize.c	2008-07-16 16:49:03.000000000 +0200
@@ -188,11 +188,6 @@ errcode_t ext2fs_get_device_size2(const 
 #endif
 	if (valid_blkgetsize64 &&
 	    ioctl(fd, BLKGETSIZE64, &size64) >= 0) {
-		if ((sizeof(*retblocks) < sizeof(unsigned long long)) &&
-		    ((size64 / blocksize) > 0xFFFFFFFF)) {
-			rc = EFBIG;
-			goto out;
-		}
 		*retblocks = size64 / blocksize;
 		goto out;
 	}
@@ -253,11 +248,6 @@ errcode_t ext2fs_get_device_size2(const 
 		if (fstat(fd, &st) == 0)
 #endif
 			if (S_ISREG(st.st_mode)) {
-				if ((sizeof(*retblocks) < sizeof(unsigned long long)) &&
-				    ((st.st_size / blocksize) > 0xFFFFFFFF)) {
-					rc = EFBIG;
-					goto out;
-				}
 				*retblocks = st.st_size / blocksize;
 				goto out;
 			}
@@ -282,11 +272,6 @@ errcode_t ext2fs_get_device_size2(const 
 	}
 	valid_offset (fd, 0);
 	size64 = low + 1;
-	if ((sizeof(*retblocks) < sizeof(unsigned long long))
-	    && ((size64 / blocksize) > 0xFFFFFFFF)) {
-		rc = EFBIG;
-		goto out;
-	}
 	*retblocks = size64 / blocksize;
 out:
 	close(fd);
--
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