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Date: Mon, 28 Jul 2014 11:43:22 +0400
From: Azat Khuzhin <a3at.mail@...il.com>
To: linux-ext4@...r.kernel.org
Cc: tytso@....edu, darrick.wong@...cle.com, adilger@...ger.ca,
Azat Khuzhin <a3at.mail@...il.com>
Subject: [PATCH 1/4 v3] journal: use consts instead of 1024 and add helper for journal with 1k blocksize
Use
EXT2_MIN_BLOCK_SIZE/JFS_MIN_JOURNAL_BLOCKS/SUPERBLOCK_SIZE/SUPERBLOCK_OFFSET
instead of hardcoded 1024 when it is okay, and also add a helper
ext2fs_journal_sb_start() that will return start of journal sb with
special case for fs with 1k block size.
Signed-off-by: Azat Khuzhin <a3at.mail@...il.com>
Reviewed-by: Andreas Dilger <adilger@...ger.ca>
---
e2fsck/journal.c | 5 ++---
lib/ext2fs/ext2fs.h | 1 +
lib/ext2fs/mkjournal.c | 28 ++++++++++++++++------------
misc/tune2fs.c | 6 +++---
4 files changed, 22 insertions(+), 18 deletions(-)
diff --git a/e2fsck/journal.c b/e2fsck/journal.c
index 9be52cd..3b40e00 100644
--- a/e2fsck/journal.c
+++ b/e2fsck/journal.c
@@ -393,8 +393,7 @@ static errcode_t e2fsck_get_journal(e2fsck_t ctx, journal_t **ret_journal)
if (ext_journal) {
blk64_t maxlen;
- if (ctx->fs->blocksize == 1024)
- start = 1;
+ start = ext2fs_journal_sb_start(ctx->fs->blocksize) - 1;
bh = getblk(dev_journal, start, ctx->fs->blocksize);
if (!bh) {
retval = EXT2_ET_NO_MEMORY;
@@ -405,7 +404,7 @@ static errcode_t e2fsck_get_journal(e2fsck_t ctx, journal_t **ret_journal)
brelse(bh);
goto errout;
}
- memcpy(&jsuper, start ? bh->b_data : bh->b_data + 1024,
+ memcpy(&jsuper, start ? bh->b_data : bh->b_data + SUPERBLOCK_OFFSET,
sizeof(jsuper));
brelse(bh);
#ifdef WORDS_BIGENDIAN
diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h
index 33b2519..ab57534 100644
--- a/lib/ext2fs/ext2fs.h
+++ b/lib/ext2fs/ext2fs.h
@@ -1377,6 +1377,7 @@ extern errcode_t ext2fs_add_journal_inode(ext2_filsys fs, blk_t num_blocks,
extern errcode_t ext2fs_add_journal_inode2(ext2_filsys fs, blk_t num_blocks,
blk64_t goal, int flags);
extern int ext2fs_default_journal_size(__u64 num_blocks);
+extern int ext2fs_journal_sb_start(int blocksize);
/* openfs.c */
extern errcode_t ext2fs_open(const char *name, int flags, int superblock,
diff --git a/lib/ext2fs/mkjournal.c b/lib/ext2fs/mkjournal.c
index e8316a7..96b6d36 100644
--- a/lib/ext2fs/mkjournal.c
+++ b/lib/ext2fs/mkjournal.c
@@ -49,7 +49,7 @@ errcode_t ext2fs_create_journal_superblock(ext2_filsys fs,
errcode_t retval;
journal_superblock_t *jsb;
- if (num_blocks < 1024)
+ if (num_blocks < JFS_MIN_JOURNAL_BLOCKS)
return EXT2_ET_JOURNAL_TOO_SMALL;
if ((retval = ext2fs_get_mem(fs->blocksize, &jsb)))
@@ -75,10 +75,7 @@ errcode_t ext2fs_create_journal_superblock(ext2_filsys fs,
if (fs->super->s_feature_incompat &
EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) {
jsb->s_nr_users = 0;
- if (fs->blocksize == 1024)
- jsb->s_first = htonl(3);
- else
- jsb->s_first = htonl(2);
+ jsb->s_first = htonl(ext2fs_journal_sb_start(fs->blocksize) + 1);
}
*ret_jsb = (char *) jsb;
@@ -428,6 +425,13 @@ int ext2fs_default_journal_size(__u64 num_blocks)
return 32768;
}
+int ext2fs_journal_sb_start(int blocksize)
+{
+ if (blocksize == EXT2_MIN_BLOCK_SIZE)
+ return 2;
+ return 1;
+}
+
/*
* This function adds a journal device to a filesystem
*/
@@ -435,7 +439,7 @@ errcode_t ext2fs_add_journal_device(ext2_filsys fs, ext2_filsys journal_dev)
{
struct stat st;
errcode_t retval;
- char buf[1024];
+ char buf[SUPERBLOCK_SIZE];
journal_superblock_t *jsb;
int start;
__u32 i, nr_users;
@@ -448,10 +452,9 @@ errcode_t ext2fs_add_journal_device(ext2_filsys fs, ext2_filsys journal_dev)
return EXT2_ET_JOURNAL_NOT_BLOCK; /* Must be a block device */
/* Get the journal superblock */
- start = 1;
- if (journal_dev->blocksize == 1024)
- start++;
- if ((retval = io_channel_read_blk64(journal_dev->io, start, -1024,
+ start = ext2fs_journal_sb_start(journal_dev->blocksize);
+ if ((retval = io_channel_read_blk64(journal_dev->io, start,
+ -SUPERBLOCK_SIZE,
buf)))
return retval;
@@ -477,7 +480,8 @@ errcode_t ext2fs_add_journal_device(ext2_filsys fs, ext2_filsys journal_dev)
}
/* Writeback the journal superblock */
- if ((retval = io_channel_write_blk64(journal_dev->io, start, -1024, buf)))
+ if ((retval = io_channel_write_blk64(journal_dev->io, start,
+ -SUPERBLOCK_SIZE, buf)))
return retval;
fs->super->s_journal_inum = 0;
@@ -630,7 +634,7 @@ main(int argc, char **argv)
exit(1);
}
- retval = ext2fs_add_journal_inode(fs, 1024, 0);
+ retval = ext2fs_add_journal_inode(fs, JFS_MIN_JOURNAL_BLOCKS, 0);
if (retval) {
com_err(argv[0], retval, "while adding journal to %s",
device_name);
diff --git a/misc/tune2fs.c b/misc/tune2fs.c
index ad0b05f..ff50f37 100644
--- a/misc/tune2fs.c
+++ b/misc/tune2fs.c
@@ -182,7 +182,7 @@ static int remove_journal_device(ext2_filsys fs)
{
char *journal_path;
ext2_filsys jfs;
- char buf[1024];
+ char buf[SUPERBLOCK_SIZE];
journal_superblock_t *jsb;
int i, nr_users;
errcode_t retval;
@@ -225,7 +225,7 @@ static int remove_journal_device(ext2_filsys fs)
}
/* Get the journal superblock */
- if ((retval = io_channel_read_blk64(jfs->io, 1, -1024, buf))) {
+ if ((retval = io_channel_read_blk64(jfs->io, 1, -SUPERBLOCK_SIZE, buf))) {
com_err(program_name, retval, "%s",
_("while reading journal superblock"));
goto no_valid_journal;
@@ -256,7 +256,7 @@ static int remove_journal_device(ext2_filsys fs)
jsb->s_nr_users = htonl(nr_users);
/* Write back the journal superblock */
- if ((retval = io_channel_write_blk64(jfs->io, 1, -1024, buf))) {
+ if ((retval = io_channel_write_blk64(jfs->io, 1, -SUPERBLOCK_SIZE, buf))) {
com_err(program_name, retval,
"while writing journal superblock.");
goto no_valid_journal;
--
2.0.1
--
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