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simplefs_write: add journaling using jbd2

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This commit is contained in:
Azat Khuzhin 2014-07-13 00:44:35 +04:00
parent dad5b1c50e
commit f8009d2223
1 changed files with 27 additions and 3 deletions
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30
simple.c
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@ -359,19 +359,25 @@ ssize_t simplefs_write(struct file * filp, const char __user * buf, size_t len,
struct simplefs_inode *sfs_inode;
struct buffer_head *bh;
struct super_block *sb;
struct simplefs_super_block *sfs_sb;
handle_t *handle;
char *buffer;
int retval;
sb = filp->f_path.dentry->d_inode->i_sb;
sfs_sb = SIMPLEFS_SB(sb);
handle = jbd2_journal_start(sfs_sb->journal, 1);
if (IS_ERR(handle))
return PTR_ERR(handle);
retval = generic_write_checks(filp, ppos, &len, 0);
if (retval) {
if (retval)
return retval;
}
inode = filp->f_path.dentry->d_inode;
sfs_inode = SIMPLEFS_INODE(inode);
sb = inode->i_sb;
bh = sb_bread(filp->f_path.dentry->d_inode->i_sb,
sfs_inode->data_block_number);
@ -386,6 +392,13 @@ ssize_t simplefs_write(struct file * filp, const char __user * buf, size_t len,
/* Move the pointer until the required byte offset */
buffer += *ppos;
retval = jbd2_journal_get_write_access(handle, bh);
if (WARN_ON(retval)) {
brelse(bh);
sfs_trace("Can't get write access for bh\n");
return retval;
}
if (copy_from_user(buffer, buf, len)) {
brelse(bh);
printk(KERN_ERR
@ -394,6 +407,17 @@ ssize_t simplefs_write(struct file * filp, const char __user * buf, size_t len,
}
*ppos += len;
retval = jbd2_journal_dirty_metadata(handle, bh);
if (WARN_ON(retval)) {
brelse(bh);
return retval;
}
retval = jbd2_journal_stop(handle);
if (WARN_ON(retval)) {
brelse(bh);
return retval;
}
mark_buffer_dirty(bh);
sync_dirty_buffer(bh);
brelse(bh);