int fat_directory_expand(fat_directory_t *di)
{
int rc;
fat_cluster_t mcl, lcl;
if (!FAT_IS_FAT32(di->bs) && di->nodep->firstc == FAT_CLST_ROOT) {
/* Can't grow the root directory on FAT12/16. */
return ENOSPC;
}
rc = fat_alloc_clusters(di->bs, di->nodep->idx->service_id, 1, &mcl,
&lcl);
if (rc != EOK)
return rc;
rc = fat_zero_cluster(di->bs, di->nodep->idx->service_id, mcl);
if (rc != EOK) {
(void) fat_free_clusters(di->bs, di->nodep->idx->service_id,
mcl);
return rc;
}
rc = fat_append_clusters(di->bs, di->nodep, mcl, lcl);
if (rc != EOK) {
(void) fat_free_clusters(di->bs, di->nodep->idx->service_id,
mcl);
return rc;
}
di->nodep->size += BPS(di->bs) * SPC(di->bs);
di->nodep->dirty = true; /* need to sync node */
di->blocks = di->nodep->size / BPS(di->bs);
return EOK;
}
static long fat_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
{
int err = 0;
struct inode *inode = file->f_mapping->host;
int cluster, nr_cluster, fclus, dclus, free_bytes, nr_bytes;
struct super_block *sb = inode->i_sb;
struct msdos_sb_info *sbi = MSDOS_SB(sb);
if (mode & ~FALLOC_FL_KEEP_SIZE)
return -EOPNOTSUPP;
if ((offset + len) <= MSDOS_I(inode)->mmu_private) {
fat_msg(sb, KERN_ERR,
"fat_fallocate():Blocks already allocated");
return -EINVAL;
}
if ((mode & FALLOC_FL_KEEP_SIZE)) {
if (inode->i_size > 0) {
err = fat_get_cluster(inode, FAT_ENT_EOF,
&fclus, &dclus);
if (err < 0) {
fat_msg(sb, KERN_ERR,
"fat_fallocate():fat_get_cluster() error");
return err;
}
free_bytes = ((fclus+1) << sbi->cluster_bits) -
(inode->i_size);
nr_bytes = (offset + len - inode->i_size) - free_bytes;
} else
nr_bytes = (offset + len - inode->i_size);
nr_cluster = (nr_bytes + (sbi->cluster_size - 1)) >>
sbi->cluster_bits;
mutex_lock(&inode->i_mutex);
while (nr_cluster-- > 0) {
err = fat_alloc_clusters(inode, &cluster, 1);
if (err) {
fat_msg(sb, KERN_ERR,
"fat_fallocate():fat_alloc_clusters() error");
goto error;
}
err = fat_chain_add(inode, cluster, 1);
if (err) {
fat_free_clusters(inode, cluster);
goto error;
}
}
err = fat_get_cluster(inode, FAT_ENT_EOF, &fclus, &dclus);
if (err < 0) {
fat_msg(sb, KERN_ERR,
"fat_fallocate():fat_get_cluster() error");
goto error;
}
MSDOS_I(inode)->mmu_private = (fclus + 1) << sbi->cluster_bits;
} else {
