/**
* wakeup function of logging process
* @param __data : super block
*/
void rfs_log_wakeup(unsigned long __data)
{
struct super_block *sb = (struct super_block *) __data;
struct task_struct *p = RFS_SB(sb)->sleep_proc;
mod_timer(&RFS_SB(sb)->timer, DATA_EXPIRES(jiffies));
if (p->state == TASK_UNINTERRUPTIBLE)
wake_up_process(p);
}
/**
* read dir entry in specified directory
* @param inode specified directory inode
* @param bh buffer head to read dir entries
* @param ppos entry position to read
* @param[out] dir_info to save dir entry info
* @return return 0 on success, errno on failure
*/
static int internal_readdir(struct inode *inode, struct buffer_head **bh, loff_t *ppos, struct rfs_dir_info *dir_info)
{
#ifdef CONFIG_RFS_VFAT
unsigned short uname[UNICODE_NAME_LENGTH];
#endif
struct rfs_dir_entry *ep = NULL;
loff_t index = *ppos;
unsigned long ino;
unsigned int type;
int err;
while (1) {
ep = get_entry(inode, (u32) index, bh);
if (IS_ERR(ep))
return PTR_ERR(ep);
index++;
type = entry_type(ep);
dir_info->type = type;
if (type == TYPE_UNUSED)
return -INTERNAL_EOF; /* not error case */
if ((type == TYPE_DELETED) || (type == TYPE_EXTEND) ||
(type == TYPE_VOLUME))
continue;
#ifdef CONFIG_RFS_VFAT
uname[0] = 0x0;
get_uname_from_entry(inode, index - 1, uname);
if (uname[0] == 0x0 || !IS_VFAT(RFS_SB(inode->i_sb)))
convert_dosname_to_cstring(dir_info->name, ep->name, ep->sysid);
else
convert_uname_to_cstring(dir_info->name, uname, RFS_SB(inode->i_sb)->nls_disk);
#else
convert_dosname_to_cstring(dir_info->name, ep->name, ep->sysid);
#endif
err = rfs_iunique(inode, index - 1, &ino);
if (err)
return err;
dir_info->ino = ino;
*ppos = index;
return 0;
}
return 0;
}
/**
* rfs_direct_IO - directly read/write from/to user space buffers without cache
* @param rw read/write type
* @param inode inode
* @param iobuf iobuf
* @param blocknr number of blocks
* @param blocksize block size
* @return write/read size on success, errno on failure
*/
int rfs_direct_IO(int rw, struct inode *inode, struct kiobuf *iobuf, unsigned long blocknr, int blocksize)
{
struct super_block *sb = inode->i_sb;
loff_t offset, old_size = inode->i_size;
unsigned int alloc_clus = 0;
int zerofilled = FALSE, ret;
offset = blocknr << sb->s_blocksize_bits;
if (rw == WRITE) {
unsigned int clu_size, clu_bits;
unsigned int req_clus, free_clus;
clu_size = RFS_SB(sb)->cluster_size;
clu_bits = RFS_SB(sb)->cluster_bits;
/* compare the number of required clusters with free clusters */
alloc_clus = (inode->i_size + clu_size - 1) >> clu_bits;
req_clus = (offset + iobuf->length + clu_size - 1) >> clu_bits;
if (req_clus > alloc_clus)
req_clus -= alloc_clus; /* required clusters */
else
req_clus = 0;
if (rfs_log_start(inode->i_sb, RFS_LOG_WRITE, inode))
return -EIO;
free_clus = GET_FREE_CLUS(RFS_SB(sb));
if (req_clus > free_clus) {
DEBUG(DL1, "req_clus = %d free_clus = %d \n",
req_clus, free_clus);
ret = -ENOSPC;
goto end_log;
}
/* lseek case in direct IO */
if (offset > old_size) {
/*
* NOTE: In spite of direc IO,
* we use page cache for extend_with_zeorfill
*/
ret = extend_with_zerofill(inode,
(u32) old_size, (u32) offset);
if (ret)
goto end_log;
inode->i_size = offset;
set_mmu_private(inode, offset);
zerofilled = TRUE;
}
}