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Date: Tue, 06 Mar 2012 16:01:36 -0800
From: "Darrick J. Wong" <djwong@...ibm.com>
To: Andreas Dilger <adilger.kernel@...ger.ca>,
Theodore Tso <tytso@....edu>,
"Darrick J. Wong" <djwong@...ibm.com>
Cc: Sunil Mushran <sunil.mushran@...cle.com>,
Amir Goldstein <amir73il@...il.com>,
Andi Kleen <andi@...stfloor.org>,
Mingming Cao <cmm@...ibm.com>,
Joel Becker <jlbec@...lplan.org>, linux-ext4@...r.kernel.org,
Coly Li <colyli@...il.com>
Subject: [PATCH 36/54] libext2fs: Block group checksum should use
metadata_csum algorithm
Change the block group algorithm to use the same algorithm as the rest of the
metadata_csum. This mostly involves providing a helper function to tell if
group descriptors should have checksums set or verified, and modifying the gdt
checksum code to use the correct algorithm.
Signed-off-by: Darrick J. Wong <djwong@...ibm.com>
---
debugfs/debugfs.c | 3 +-
lib/ext2fs/alloc.c | 6 +---
lib/ext2fs/alloc_stats.c | 3 +-
lib/ext2fs/csum.c | 67 ++++++++++++++++++++++++++++------------------
lib/ext2fs/ext2fs.h | 6 ++++
lib/ext2fs/initialize.c | 3 +-
lib/ext2fs/inode.c | 9 ++----
lib/ext2fs/openfs.c | 3 +-
lib/ext2fs/rw_bitmaps.c | 12 +++-----
misc/dumpe2fs.c | 4 +--
resize/resize2fs.c | 12 +++-----
11 files changed, 66 insertions(+), 62 deletions(-)
diff --git a/debugfs/debugfs.c b/debugfs/debugfs.c
index 36dd730..2e46cd5 100644
--- a/debugfs/debugfs.c
+++ b/debugfs/debugfs.c
@@ -357,8 +357,7 @@ void do_show_super_stats(int argc, char *argv[])
return;
}
- gdt_csum = EXT2_HAS_RO_COMPAT_FEATURE(current_fs->super,
- EXT4_FEATURE_RO_COMPAT_GDT_CSUM);
+ gdt_csum = ext2fs_has_group_desc_csum(current_fs);
for (i = 0; i < current_fs->group_desc_count; i++) {
fprintf(out, " Group %2d: block bitmap at %llu, "
"inode bitmap at %llu, "
diff --git a/lib/ext2fs/alloc.c b/lib/ext2fs/alloc.c
index 948a0ec..e62ed68 100644
--- a/lib/ext2fs/alloc.c
+++ b/lib/ext2fs/alloc.c
@@ -36,8 +36,7 @@ static void check_block_uninit(ext2_filsys fs, ext2fs_block_bitmap map,
blk64_t blk, super_blk, old_desc_blk, new_desc_blk;
int old_desc_blocks;
- if (!(EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
- EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) ||
+ if (!ext2fs_has_group_desc_csum(fs) ||
!(ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT)))
return;
@@ -83,8 +82,7 @@ static void check_inode_uninit(ext2_filsys fs, ext2fs_inode_bitmap map,
{
ext2_ino_t i, ino;
- if (!(EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
- EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) ||
+ if (!ext2fs_has_group_desc_csum(fs) ||
!(ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT)))
return;
diff --git a/lib/ext2fs/alloc_stats.c b/lib/ext2fs/alloc_stats.c
index adec363..4229084 100644
--- a/lib/ext2fs/alloc_stats.c
+++ b/lib/ext2fs/alloc_stats.c
@@ -38,8 +38,7 @@ void ext2fs_inode_alloc_stats2(ext2_filsys fs, ext2_ino_t ino,
/* We don't strictly need to be clearing the uninit flag if inuse < 0
* (i.e. freeing inodes) but it also means something is bad. */
ext2fs_bg_flags_clear(fs, group, EXT2_BG_INODE_UNINIT);
- if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
- EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
+ if (ext2fs_has_group_desc_csum(fs)) {
ext2_ino_t first_unused_inode = fs->super->s_inodes_per_group -
ext2fs_bg_itable_unused(fs, group) +
group * fs->super->s_inodes_per_group + 1;
diff --git a/lib/ext2fs/csum.c b/lib/ext2fs/csum.c
index 11a24f0..d4f98e0 100644
--- a/lib/ext2fs/csum.c
+++ b/lib/ext2fs/csum.c
@@ -696,39 +696,56 @@ STATIC __u16 ext2fs_group_desc_csum(ext2_filsys fs, dgrp_t group)
desc = ext2fs_group_desc(fs, fs->group_desc, group);
- if (fs->super->s_feature_ro_compat & EXT4_FEATURE_RO_COMPAT_GDT_CSUM) {
- size_t offset = offsetof(struct ext2_group_desc, bg_checksum);
-
#ifdef WORDS_BIGENDIAN
- struct ext4_group_desc swabdesc;
+ struct ext4_group_desc swabdesc;
- /* Have to swab back to little-endian to do the checksum */
- memcpy(&swabdesc, desc, size);
- ext2fs_swap_group_desc2(fs,
- (struct ext2_group_desc *) &swabdesc);
- desc = (struct ext2_group_desc *) &swabdesc;
+ /* Have to swab back to little-endian to do the checksum */
+ memcpy(&swabdesc, desc, size);
+ ext2fs_swap_group_desc2(fs,
+ (struct ext2_group_desc *) &swabdesc);
+ desc = (struct ext2_group_desc *) &swabdesc;
- group = ext2fs_swab32(group);
+ group = ext2fs_swab32(group);
#endif
- crc = ext2fs_crc16(~0, fs->super->s_uuid,
- sizeof(fs->super->s_uuid));
- crc = ext2fs_crc16(crc, &group, sizeof(group));
- crc = ext2fs_crc16(crc, desc, offset);
- offset += sizeof(desc->bg_checksum); /* skip checksum */
- /* for checksum of struct ext4_group_desc do the rest...*/
- if (offset < size) {
- crc = ext2fs_crc16(crc, (char *)desc + offset,
- size - offset);
- }
+
+ if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
+ EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
+ /* new metadata csum code */
+ __u16 old_crc;
+ __u32 crc32;
+
+ old_crc = desc->bg_checksum;
+ desc->bg_checksum = 0;
+ crc32 = ext2fs_crc32c_le(fs->csum_seed, (unsigned char *)&group,
+ sizeof(group));
+ crc32 = ext2fs_crc32c_le(crc32, (unsigned char *)desc,
+ size);
+ desc->bg_checksum = old_crc;
+
+ crc = crc32 & 0xFFFF;
+ goto out;
}
+ /* old crc16 code */
+ size_t offset = offsetof(struct ext2_group_desc, bg_checksum);
+ crc = ext2fs_crc16(~0, fs->super->s_uuid,
+ sizeof(fs->super->s_uuid));
+ crc = ext2fs_crc16(crc, &group, sizeof(group));
+ crc = ext2fs_crc16(crc, desc, offset);
+ offset += sizeof(desc->bg_checksum); /* skip checksum */
+ /* for checksum of struct ext4_group_desc do the rest...*/
+ if (offset < size) {
+ crc = ext2fs_crc16(crc, (char *)desc + offset,
+ size - offset);
+ }
+
+out:
return crc;
}
int ext2fs_group_desc_csum_verify(ext2_filsys fs, dgrp_t group)
{
- if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
- EXT4_FEATURE_RO_COMPAT_GDT_CSUM) &&
+ if (ext2fs_has_group_desc_csum(fs) &&
(ext2fs_bg_checksum(fs, group) !=
ext2fs_group_desc_csum(fs, group)))
return 0;
@@ -738,8 +755,7 @@ int ext2fs_group_desc_csum_verify(ext2_filsys fs, dgrp_t group)
void ext2fs_group_desc_csum_set(ext2_filsys fs, dgrp_t group)
{
- if (!EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
- EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
+ if (!ext2fs_has_group_desc_csum(fs))
return;
/* ext2fs_bg_checksum_set() sets the actual checksum field but
@@ -773,8 +789,7 @@ errcode_t ext2fs_set_gdt_csum(ext2_filsys fs)
if (!fs->inode_map)
return EXT2_ET_NO_INODE_BITMAP;
- if (!EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
- EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
+ if (!ext2fs_has_group_desc_csum(fs))
return 0;
for (i = 0; i < fs->group_desc_count; i++) {
diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h
index 9574525..eeac04d 100644
--- a/lib/ext2fs/ext2fs.h
+++ b/lib/ext2fs/ext2fs.h
@@ -642,6 +642,12 @@ typedef struct stat ext2fs_struct_stat;
/*
* function prototypes
*/
+static inline int ext2fs_has_group_desc_csum(ext2_filsys fs)
+{
+ return EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
+ EXT4_FEATURE_RO_COMPAT_GDT_CSUM |
+ EXT4_FEATURE_RO_COMPAT_METADATA_CSUM);
+}
/* alloc.c */
extern errcode_t ext2fs_new_inode(ext2_filsys fs, ext2_ino_t dir, int mode,
diff --git a/lib/ext2fs/initialize.c b/lib/ext2fs/initialize.c
index a63ea18..a22cab4 100644
--- a/lib/ext2fs/initialize.c
+++ b/lib/ext2fs/initialize.c
@@ -435,8 +435,7 @@ ipg_retry:
* bitmaps will be accounted for when allocated).
*/
free_blocks = 0;
- csum_flag = EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
- EXT4_FEATURE_RO_COMPAT_GDT_CSUM);
+ csum_flag = ext2fs_has_group_desc_csum(fs);
for (i = 0; i < fs->group_desc_count; i++) {
/*
* Don't set the BLOCK_UNINIT group for the last group
diff --git a/lib/ext2fs/inode.c b/lib/ext2fs/inode.c
index 74703c5..3e6d853 100644
--- a/lib/ext2fs/inode.c
+++ b/lib/ext2fs/inode.c
@@ -157,8 +157,7 @@ errcode_t ext2fs_open_inode_scan(ext2_filsys fs, int buffer_blocks,
scan->current_group);
scan->inodes_left = EXT2_INODES_PER_GROUP(scan->fs->super);
scan->blocks_left = scan->fs->inode_blocks_per_group;
- if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
- EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
+ if (ext2fs_has_group_desc_csum(fs)) {
scan->inodes_left -=
ext2fs_bg_itable_unused(fs, scan->current_group);
scan->blocks_left =
@@ -183,8 +182,7 @@ errcode_t ext2fs_open_inode_scan(ext2_filsys fs, int buffer_blocks,
}
if (scan->fs->badblocks && scan->fs->badblocks->num)
scan->scan_flags |= EXT2_SF_CHK_BADBLOCKS;
- if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
- EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
+ if (ext2fs_has_group_desc_csum(fs))
scan->scan_flags |= EXT2_SF_DO_LAZY;
*ret_scan = scan;
return 0;
@@ -250,8 +248,7 @@ static errcode_t get_next_blockgroup(ext2_inode_scan scan)
scan->bytes_left = 0;
scan->inodes_left = EXT2_INODES_PER_GROUP(fs->super);
scan->blocks_left = fs->inode_blocks_per_group;
- if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
- EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
+ if (ext2fs_has_group_desc_csum(fs)) {
scan->inodes_left -=
ext2fs_bg_itable_unused(fs, scan->current_group);
scan->blocks_left =
diff --git a/lib/ext2fs/openfs.c b/lib/ext2fs/openfs.c
index d2b64f4..2dc9b94 100644
--- a/lib/ext2fs/openfs.c
+++ b/lib/ext2fs/openfs.c
@@ -382,8 +382,7 @@ errcode_t ext2fs_open2(const char *name, const char *io_options,
* If recovery is from backup superblock, Clear _UNININT flags &
* reset bg_itable_unused to zero
*/
- if (superblock > 1 && EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
- EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
+ if (superblock > 1 && ext2fs_has_group_desc_csum(fs)) {
dgrp_t group;
for (group = 0; group < fs->group_desc_count; group++) {
diff --git a/lib/ext2fs/rw_bitmaps.c b/lib/ext2fs/rw_bitmaps.c
index a5097c1..18e18aa 100644
--- a/lib/ext2fs/rw_bitmaps.c
+++ b/lib/ext2fs/rw_bitmaps.c
@@ -36,7 +36,7 @@ static errcode_t write_bitmaps(ext2_filsys fs, int do_inode, int do_block)
unsigned int nbits;
errcode_t retval;
char *block_buf = NULL, *inode_buf = NULL;
- int csum_flag = 0;
+ int csum_flag;
blk64_t blk;
blk64_t blk_itr = EXT2FS_B2C(fs, fs->super->s_first_data_block);
ext2_ino_t ino_itr = 1;
@@ -46,9 +46,7 @@ static errcode_t write_bitmaps(ext2_filsys fs, int do_inode, int do_block)
if (!(fs->flags & EXT2_FLAG_RW))
return EXT2_ET_RO_FILSYS;
- if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
- EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
- csum_flag = 1;
+ csum_flag = ext2fs_has_group_desc_csum(fs);
inode_nbytes = block_nbytes = 0;
if (do_block) {
@@ -168,7 +166,7 @@ static errcode_t read_bitmaps(ext2_filsys fs, int do_inode, int do_block)
errcode_t retval;
int block_nbytes = EXT2_CLUSTERS_PER_GROUP(fs->super) / 8;
int inode_nbytes = EXT2_INODES_PER_GROUP(fs->super) / 8;
- int csum_flag = 0;
+ int csum_flag;
int do_image = fs->flags & EXT2_FLAG_IMAGE_FILE;
unsigned int cnt;
blk64_t blk;
@@ -181,9 +179,7 @@ static errcode_t read_bitmaps(ext2_filsys fs, int do_inode, int do_block)
fs->write_bitmaps = ext2fs_write_bitmaps;
- if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
- EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
- csum_flag = 1;
+ csum_flag = ext2fs_has_group_desc_csum(fs);
retval = ext2fs_get_mem(strlen(fs->device_name) + 80, &buf);
if (retval)
diff --git a/misc/dumpe2fs.c b/misc/dumpe2fs.c
index 23dec30..40398a7 100644
--- a/misc/dumpe2fs.c
+++ b/misc/dumpe2fs.c
@@ -114,7 +114,7 @@ static void print_bg_opts(ext2_filsys fs, dgrp_t i)
{
int first = 1, bg_flags = 0;
- if (fs->super->s_feature_ro_compat & EXT4_FEATURE_RO_COMPAT_GDT_CSUM)
+ if (ext2fs_has_group_desc_csum(fs))
bg_flags = ext2fs_bg_flags(fs, i);
print_bg_opt(bg_flags, EXT2_BG_INODE_UNINIT, "INODE_UNINIT",
@@ -190,7 +190,7 @@ static void list_desc (ext2_filsys fs)
print_range(first_block, last_block);
fputs(")", stdout);
print_bg_opts(fs, i);
- if (fs->super->s_feature_ro_compat & EXT4_FEATURE_RO_COMPAT_GDT_CSUM)
+ if (ext2fs_has_group_desc_csum(fs))
printf(_(" Checksum 0x%04x, unused inodes %u\n"),
ext2fs_bg_checksum(fs, i),
ext2fs_bg_itable_unused(fs, i));
diff --git a/resize/resize2fs.c b/resize/resize2fs.c
index dc2805d..8a02ff4 100644
--- a/resize/resize2fs.c
+++ b/resize/resize2fs.c
@@ -191,8 +191,7 @@ static void fix_uninit_block_bitmaps(ext2_filsys fs)
int old_desc_blocks;
dgrp_t g;
- if (!(EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
- EXT4_FEATURE_RO_COMPAT_GDT_CSUM)))
+ if (!ext2fs_has_group_desc_csum(fs))
return;
for (g=0; g < fs->group_desc_count; g++) {
@@ -482,8 +481,7 @@ retry:
group_block = fs->super->s_first_data_block +
old_fs->group_desc_count * fs->super->s_blocks_per_group;
- csum_flag = EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
- EXT4_FEATURE_RO_COMPAT_GDT_CSUM);
+ csum_flag = ext2fs_has_group_desc_csum(fs);
adj = old_fs->group_desc_count;
max_group = fs->group_desc_count - adj;
if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
@@ -743,8 +741,7 @@ static void mark_fs_metablock(ext2_resize_t rfs,
} else if (IS_INODE_TB(fs, group, blk)) {
ext2fs_inode_table_loc_set(fs, group, 0);
rfs->needed_blocks++;
- } else if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
- EXT4_FEATURE_RO_COMPAT_GDT_CSUM) &&
+ } else if (ext2fs_has_group_desc_csum(fs) &&
(ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT))) {
/*
* If the block bitmap is uninitialized, which means
@@ -804,8 +801,7 @@ static errcode_t blocks_to_move(ext2_resize_t rfs)
for (blk = ext2fs_blocks_count(fs->super);
blk < ext2fs_blocks_count(old_fs->super); blk++) {
g = ext2fs_group_of_blk2(fs, blk);
- if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
- EXT4_FEATURE_RO_COMPAT_GDT_CSUM) &&
+ if (ext2fs_has_group_desc_csum(fs) &&
ext2fs_bg_flags_test(old_fs, g, EXT2_BG_BLOCK_UNINIT)) {
/*
* The block bitmap is uninitialized, so skip
--
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