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Implement journal_path option

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This commit is contained in:
Azat Khuzhin 2014-09-17 20:52:09 +04:00
parent fd1dc7a951
commit 33f5f117df
1 changed files with 34 additions and 5 deletions
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39
simple.c
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@ -10,6 +10,7 @@
#include <linux/init.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/namei.h>
#include <linux/buffer_head.h>
#include <linux/slab.h>
#include <linux/random.h>
@ -737,14 +738,12 @@ static int simplefs_load_journal(struct super_block *sb, int devnum)
return 0;
}
static int simplefs_sb_load_journal(struct super_block *sb)
static int simplefs_sb_load_journal(struct super_block *sb, struct inode *inode)
{
struct journal_s *journal;
struct simplefs_super_block *sfs_sb = SIMPLEFS_SB(sb);
struct inode *journal_inode;
journal_inode = simplefs_iget(sb, SIMPLEFS_JOURNAL_INODE_NUMBER);
journal = jbd2_journal_init_inode(journal_inode);
journal = jbd2_journal_init_inode(inode);
if (!journal) {
printk(KERN_ERR "Can't load journal\n");
return 1;
@ -757,8 +756,10 @@ static int simplefs_sb_load_journal(struct super_block *sb)
}
#define SIMPLEFS_OPT_JOURNAL_DEV 1
#define SIMPLEFS_OPT_JOURNAL_PATH 2
static const match_table_t tokens = {
{SIMPLEFS_OPT_JOURNAL_DEV, "journal_dev=%u"},
{SIMPLEFS_OPT_JOURNAL_PATH, "journal_path=%s"},
};
static int simplefs_parse_options(struct super_block *sb, char *options)
{
@ -781,6 +782,30 @@ static int simplefs_parse_options(struct super_block *sb, char *options)
if ((ret = simplefs_load_journal(sb, arg)))
return ret;
break;
case SIMPLEFS_OPT_JOURNAL_PATH:
{
char *journal_path;
struct inode *journal_inode;
struct path path;
BUG_ON(!(journal_path = match_strdup(&args[0])));
ret = kern_path(journal_path, LOOKUP_FOLLOW, &path);
if (ret) {
printk(KERN_ERR "could not find journal device path: error %d\n", ret);
kfree(journal_path);
}
journal_inode = path.dentry->d_inode;
path_put(&path);
kfree(journal_path);
if ((ret = simplefs_sb_load_journal(sb, journal_inode)))
return ret;
break;
}
}
}
@ -860,7 +885,11 @@ int simplefs_fill_super(struct super_block *sb, void *data, int silent)
if ((ret = simplefs_parse_options(sb, data)))
goto release;
if (!sb_disk->journal && (ret = simplefs_sb_load_journal(sb))) {
if (!sb_disk->journal) {
struct inode *journal_inode;
journal_inode = simplefs_iget(sb, SIMPLEFS_JOURNAL_INODE_NUMBER);
ret = simplefs_sb_load_journal(sb, journal_inode);
goto release;
}