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Implement external journal device instead of internal

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This commit is contained in:
Azat Khuzhin 2014-07-13 15:26:02 +04:00
parent f8009d2223
commit 57a1e15c0f
1 changed files with 46 additions and 5 deletions
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51
simple.c
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@ -15,6 +15,8 @@
#include <linux/random.h>
#include <linux/version.h>
#include <linux/jbd2.h>
#include <linux/parser.h>
#include <linux/blkdev.h>
#include "super.h"
@ -700,15 +702,23 @@ static const struct super_operations simplefs_sops = {
.put_super = simplefs_put_super,
};
static int simplefs_load_journal(struct super_block *sb)
static int simplefs_load_journal(struct super_block *sb, int devnum)
{
struct journal_s *journal;
struct inode *inode;
dev_t dev;
struct block_device *bdev;
int hblock, blocksize, len;
struct simplefs_super_block *sfs_sb = SIMPLEFS_SB(sb);
inode = simplefs_iget(sb, SIMPLEFS_JOURNAL_INODE_NUMBER);
dev = new_decode_dev(devnum);
bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
if (IS_ERR(bdev))
return 1;
blocksize = sb->s_blocksize;
hblock = bdev_logical_block_size(bdev);
len = SIMPLEFS_MAX_FILESYSTEM_OBJECTS_SUPPORTED;
journal = jbd2_journal_init_inode(inode);
journal = jbd2_journal_init_dev(bdev, sb->s_bdev, 1, len, blocksize);
journal->j_private = sb;
sfs_sb->journal = journal;
@ -716,6 +726,37 @@ static int simplefs_load_journal(struct super_block *sb)
return 0;
}
#define SIMPLEFS_OPT_JOURNAL_DEV 1
static const match_table_t tokens = {
{SIMPLEFS_OPT_JOURNAL_DEV, "journal_dev=%u"},
};
static int simplefs_parse_options(struct super_block *sb, char *options)
{
substring_t args[MAX_OPT_ARGS];
int token, ret, arg;
char *p;
while ((p = strsep(&options, ",")) != NULL) {
if (!*p)
continue;
args[0].to = args[0].from = NULL;
token = match_token(p, tokens, args);
switch (token) {
case SIMPLEFS_OPT_JOURNAL_DEV:
if (args->from && match_int(args, &arg))
return 1;
printk(KERN_INFO "Loading journal devnum: %i\n", arg);
if ((ret = simplefs_load_journal(sb, arg)))
return ret;
break;
}
}
return 0;
}
/* This function, as the name implies, Makes the super_block valid and
* fills filesystem specific information in the super block */
int simplefs_fill_super(struct super_block *sb, void *data, int silent)
@ -784,7 +825,7 @@ int simplefs_fill_super(struct super_block *sb, void *data, int silent)
goto release;
}
if ((ret = simplefs_load_journal(sb)))
if ((ret = simplefs_parse_options(sb, data)))
goto release;
ret = 0;