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e2fsprogs/e2fsprogs-1.39-ext2fs_div_ceil.patch
Eric Sandeen 3b7ddeed65 e2fsprogs 16T fixes from upstream. 
make package metadata refer to ext3 as well as ext2.
2006-09-27 19:26:10 +00:00

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# HG changeset patch
# User tytso@mit.edu
# Date Wed Aug 30 01:57:00 2006 -0400
# Node ID 59f8a8974d914231642239f176284d92dce0678d
# parent: c76ddbe4519a571de3868c2888d8bb99a559046f
Fix potential 2**32-1 overflow problems by ext2fs_div_ceil()
Add a new function, ext2fs_div_ceil(), which correctly calculates a division
of two unsigned integer where the result is always rounded up the next
largest integer. This is used everywhere where we might have
previously caused an overflow when the number of blocks
or inodes is too close to 2**32-1.
Based on patches from Eric Sandeen, but generalized to use this new function
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Eric Sandeen <esandeen@redhat.com>
Index: e2fsprogs-1.39-my-patches-from-ted/ext2ed/ChangeLog
===================================================================
--- e2fsprogs-1.39-my-patches-from-ted.orig/ext2ed/ChangeLog
+++ e2fsprogs-1.39-my-patches-from-ted/ext2ed/ChangeLog
@@ -1,3 +1,8 @@
+2006-08-30 Theodore Tso <tytso@mit.edu>
+
+ * init.c (div_ceil, set_file_system_info): Fix potential overflow
+ for really big filesystems.
+
2006-06-30 Theodore Ts'o <tytso@mit.edu>
* Release of E2fsprogs 1.38
Index: e2fsprogs-1.39-my-patches-from-ted/ext2ed/init.c
===================================================================
--- e2fsprogs-1.39-my-patches-from-ted.orig/ext2ed/init.c
+++ e2fsprogs-1.39-my-patches-from-ted/ext2ed/init.c
@@ -370,6 +370,13 @@ void add_user_command (struct struct_com
ptr->callback [num]=callback;
}
+static unsigned int div_ceil(unsigned int a, unsigned int b)
+{
+ if (!a)
+ return 0;
+ return ((a - 1) / b) + 1;
+}
+
int set_file_system_info (void)
{
@@ -415,8 +422,8 @@ int set_file_system_info (void)
file_system_info.first_group_desc_offset=2*EXT2_MIN_BLOCK_SIZE;
else
file_system_info.first_group_desc_offset=file_system_info.block_size;
- file_system_info.groups_count=( sb->s_blocks_count-sb->s_first_data_block+sb->s_blocks_per_group-1) /
- sb->s_blocks_per_group;
+ file_system_info.groups_count = div_ceil(sb->s_blocks_count,
+ sb->s_blocks_per_group);
file_system_info.inodes_per_block=file_system_info.block_size/sizeof (struct ext2_inode);
file_system_info.blocks_per_group=sb->s_inodes_per_group/file_system_info.inodes_per_block;
Index: e2fsprogs-1.39-my-patches-from-ted/lib/ext2fs/ChangeLog
===================================================================
--- e2fsprogs-1.39-my-patches-from-ted.orig/lib/ext2fs/ChangeLog
+++ e2fsprogs-1.39-my-patches-from-ted/lib/ext2fs/ChangeLog
@@ -1,3 +1,14 @@
+2006-08-30 Theodore Tso <tytso@mit.edu>
+
+ * ext2fs.h (ext2fs_div_ceil): Add new function which safely
+ calculates an integer division where the result is always
+ rounded up while avoiding overflow errors.
+
+ * initialize.c (calc_reserved_gdt_blocks, ext2fs_initialize):
+ * openfs.c (ext2fs_open2): Use ext2fs_div_ceil() instead of a
+ using an open-coded expression which was subject to
+ overflows.
+
2006-05-21 Theodore Tso <tytso@mit.edu>
* openfs.c (ext2fs_open2): Fix type warning problem with sizeof()
Index: e2fsprogs-1.39-my-patches-from-ted/lib/ext2fs/ext2fs.h
===================================================================
--- e2fsprogs-1.39-my-patches-from-ted.orig/lib/ext2fs/ext2fs.h
+++ e2fsprogs-1.39-my-patches-from-ted/lib/ext2fs/ext2fs.h
@@ -969,6 +969,7 @@ extern int ext2fs_group_of_blk(ext2_fils
extern int ext2fs_group_of_ino(ext2_filsys fs, ext2_ino_t ino);
extern blk_t ext2fs_inode_data_blocks(ext2_filsys fs,
struct ext2_inode *inode);
+extern unsigned int ext2fs_div_ceil(unsigned int a, unsigned int b);
/*
* The actual inlined functions definitions themselves...
@@ -1136,6 +1137,16 @@ _INLINE_ blk_t ext2fs_inode_data_blocks(
return inode->i_blocks -
(inode->i_file_acl ? fs->blocksize >> 9 : 0);
}
+
+/*
+ * This is an efficient, overflow safe way of calculating ceil((1.0 * a) / b)
+ */
+_INLINE_ unsigned int ext2fs_div_ceil(unsigned int a, unsigned int b)
+{
+ if (!a)
+ return 0;
+ return ((a - 1) / b) + 1;
+}
#undef _INLINE_
#endif
Index: e2fsprogs-1.39-my-patches-from-ted/lib/ext2fs/initialize.c
===================================================================
--- e2fsprogs-1.39-my-patches-from-ted.orig/lib/ext2fs/initialize.c
+++ e2fsprogs-1.39-my-patches-from-ted/lib/ext2fs/initialize.c
@@ -77,8 +77,8 @@ static unsigned int calc_reserved_gdt_bl
*/
if (sb->s_blocks_count < max_blocks / 1024)
max_blocks = sb->s_blocks_count * 1024;
- rsv_groups = (max_blocks - sb->s_first_data_block + bpg - 1) / bpg;
- rsv_gdb = (rsv_groups + gdpb - 1) / gdpb - fs->desc_blocks;
+ rsv_groups = ext2fs_div_ceil(max_blocks - sb->s_first_data_block, bpg);
+ rsv_gdb = ext2fs_div_ceil(rsv_groups, gdpb) - fs->desc_blocks;
if (rsv_gdb > EXT2_ADDR_PER_BLOCK(sb))
rsv_gdb = EXT2_ADDR_PER_BLOCK(sb);
#ifdef RES_GDT_DEBUG
@@ -205,17 +205,15 @@ errcode_t ext2fs_initialize(const char *
}
retry:
- fs->group_desc_count = (super->s_blocks_count -
- super->s_first_data_block +
- EXT2_BLOCKS_PER_GROUP(super) - 1)
- / EXT2_BLOCKS_PER_GROUP(super);
+ fs->group_desc_count = ext2fs_div_ceil(super->s_blocks_count -
+ super->s_first_data_block,
+ EXT2_BLOCKS_PER_GROUP(super));
if (fs->group_desc_count == 0) {
retval = EXT2_ET_TOOSMALL;
goto cleanup;
}
- fs->desc_blocks = (fs->group_desc_count +
- EXT2_DESC_PER_BLOCK(super) - 1)
- / EXT2_DESC_PER_BLOCK(super);
+ fs->desc_blocks = ext2fs_div_ceil(fs->group_desc_count,
+ EXT2_DESC_PER_BLOCK(super));
i = fs->blocksize >= 4096 ? 1 : 4096 / fs->blocksize;
set_field(s_inodes_count, super->s_blocks_count / i);
@@ -233,8 +231,7 @@ retry:
* should be. But make sure that we don't allocate more than
* one bitmap's worth of inodes each group.
*/
- ipg = (super->s_inodes_count + fs->group_desc_count - 1) /
- fs->group_desc_count;
+ ipg = ext2fs_div_ceil(super->s_inodes_count, fs->group_desc_count);
if (ipg > fs->blocksize * 8) {
if (super->s_blocks_per_group >= 256) {
/* Try again with slightly different parameters */
Index: e2fsprogs-1.39-my-patches-from-ted/lib/ext2fs/openfs.c
===================================================================
--- e2fsprogs-1.39-my-patches-from-ted.orig/lib/ext2fs/openfs.c
+++ e2fsprogs-1.39-my-patches-from-ted/lib/ext2fs/openfs.c
@@ -258,12 +258,11 @@ errcode_t ext2fs_open2(const char *name,
retval = EXT2_ET_CORRUPT_SUPERBLOCK;
goto cleanup;
}
- fs->group_desc_count = (fs->super->s_blocks_count -
- fs->super->s_first_data_block +
- blocks_per_group - 1) / blocks_per_group;
- fs->desc_blocks = (fs->group_desc_count +
- EXT2_DESC_PER_BLOCK(fs->super) - 1)
- / EXT2_DESC_PER_BLOCK(fs->super);
+ fs->group_desc_count = ext2fs_div_ceil(fs->super->s_blocks_count -
+ fs->super->s_first_data_block,
+ blocks_per_group);
+ fs->desc_blocks = ext2fs_div_ceil(fs->group_desc_count,
+ EXT2_DESC_PER_BLOCK(fs->super));
retval = ext2fs_get_mem(fs->desc_blocks * fs->blocksize,
&fs->group_desc);
if (retval)
Index: e2fsprogs-1.39-my-patches-from-ted/misc/ChangeLog
===================================================================
--- e2fsprogs-1.39-my-patches-from-ted.orig/misc/ChangeLog
+++ e2fsprogs-1.39-my-patches-from-ted/misc/ChangeLog
@@ -1,3 +1,12 @@
+2006-08-30 Theodore Tso <tytso@mit.edu>
+
+ * mke2fs.c (parse_extended_opts): Use ext2fs_div_ceil() instead of
+ a using an open-coded expression which was subject to
+ overflows.
+
+ * filefrag.c (div_ceil, frag_report): Fix potential overflow for
+ really big filesystems.
+
2006-05-29 Theodore Tso <tytso@mit.edu>
* filefrag.c: Add support for ancient Linux systems that do not
Index: e2fsprogs-1.39-my-patches-from-ted/misc/filefrag.c
===================================================================
--- e2fsprogs-1.39-my-patches-from-ted.orig/misc/filefrag.c
+++ e2fsprogs-1.39-my-patches-from-ted/misc/filefrag.c
@@ -47,6 +47,13 @@ int verbose = 0;
#define EXT3_EXTENTS_FL 0x00080000 /* Inode uses extents */
#define EXT3_IOC_GETFLAGS _IOR('f', 1, long)
+static unsigned int div_ceil(unsigned int a, unsigned int b)
+{
+ if (!a)
+ return 0;
+ return ((a - 1) / b) + 1;
+}
+
static unsigned long get_bmap(int fd, unsigned long block)
{
int ret;
@@ -105,7 +112,7 @@ static void frag_report(const char *file
if (verbose) {
printf("Filesystem type is: %x\n", fsinfo.f_type);
}
- cylgroups = (fsinfo.f_blocks + fsinfo.f_bsize*8-1) / fsinfo.f_bsize*8;
+ cylgroups = div_ceil(fsinfo.f_blocks, fsinfo.f_bsize*8);
if (verbose) {
printf("Filesystem cylinder groups is approximately %ld\n",
cylgroups);
Index: e2fsprogs-1.39-my-patches-from-ted/misc/mke2fs.c
===================================================================
--- e2fsprogs-1.39-my-patches-from-ted.orig/misc/mke2fs.c
+++ e2fsprogs-1.39-my-patches-from-ted/misc/mke2fs.c
@@ -819,12 +819,12 @@ static void parse_extended_opts(struct e
if (!bpg)
bpg = blocksize * 8;
gdpb = blocksize / sizeof(struct ext2_group_desc);
- group_desc_count = (param->s_blocks_count +
- bpg - 1) / bpg;
+ group_desc_count =
+ ext2fs_div_ceil(param->s_blocks_count, bpg);
desc_blocks = (group_desc_count +
gdpb - 1) / gdpb;
- rsv_groups = (resize + bpg - 1) / bpg;
- rsv_gdb = (rsv_groups + gdpb - 1) / gdpb -
+ rsv_groups = ext2fs_div_ceil(resize, bpg);
+ rsv_gdb = ext2fs_div_ceil(rsv_groups, gdpb) -
desc_blocks;
if (rsv_gdb > (int) EXT2_ADDR_PER_BLOCK(param))
rsv_gdb = EXT2_ADDR_PER_BLOCK(param);
Index: e2fsprogs-1.39-my-patches-from-ted/resize/ChangeLog
===================================================================
--- e2fsprogs-1.39-my-patches-from-ted.orig/resize/ChangeLog
+++ e2fsprogs-1.39-my-patches-from-ted/resize/ChangeLog
@@ -1,3 +1,9 @@
+2006-08-30 Theodore Tso <tytso@mit.edu>
+
+ * resize2fs.c (adjust_fs_info): Use ext2fs_div_ceil() instead of a
+ using an open-coded expression which was subject to
+ overflows.
+
2006-05-22 Theodore Tso <tytso@mit.edu>
* resize2fs.8.in: Fixed spelling mistake (Addresses Debian Bug:
Index: e2fsprogs-1.39-my-patches-from-ted/resize/resize2fs.c
===================================================================
--- e2fsprogs-1.39-my-patches-from-ted.orig/resize/resize2fs.c
+++ e2fsprogs-1.39-my-patches-from-ted/resize/resize2fs.c
@@ -190,15 +190,13 @@ errcode_t adjust_fs_info(ext2_filsys fs,
fs->super->s_blocks_count = new_size;
retry:
- fs->group_desc_count = (fs->super->s_blocks_count -
- fs->super->s_first_data_block +
- EXT2_BLOCKS_PER_GROUP(fs->super) - 1)
- / EXT2_BLOCKS_PER_GROUP(fs->super);
+ fs->group_desc_count = ext2fs_div_ceil(fs->super->s_blocks_count -
+ fs->super->s_first_data_block,
+ EXT2_BLOCKS_PER_GROUP(fs->super));
if (fs->group_desc_count == 0)
return EXT2_ET_TOOSMALL;
- fs->desc_blocks = (fs->group_desc_count +
- EXT2_DESC_PER_BLOCK(fs->super) - 1)
- / EXT2_DESC_PER_BLOCK(fs->super);
+ fs->desc_blocks = ext2fs_div_ceil(fs->group_desc_count,
+ EXT2_DESC_PER_BLOCK(fs->super));
/*
* Overhead is the number of bookkeeping blocks per group. It
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