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Date: Wed, 16 Jul 2008 12:44:37 -0500
From: "Jose R. Santos" <jrs@...ibm.com>
To: Goswin von Brederlow <goswin-v-b@....de>
Cc: "Theodore Ts'o" <tytso@....edu>, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 15/15][e2fsprogs] 64-bit mke2fs cleanup
On Wed, 16 Jul 2008 17:13:31 +0200
Goswin von Brederlow <goswin-v-b@....de> wrote:
> 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);
> + }
Well, EXT4_FEATURE_INCOMPAT_64BIT should be setup later in PRS() along
with setting up large group descriptors so this piece need work. This
should fail if what we are making is a ext3 filesystem and if we are
making a ext4 filesystem with > 32bit blocks, set the
EXT4_FEATURE_INCOMPAT_64BIT flag as well as the large bgd.
I'll fix this on the next release.
> 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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