static int
ospfs_link(struct dentry *src_dentry, struct inode *dir, struct dentry *dst_dentry) {
/* EXERCISE: Your code here. */
ospfs_inode_t *dir_oi = ospfs_inode(dir->i_ino);
ospfs_direntry_t *od;
ospfs_inode_t *oi;
uint32_t entry_ino = 0;
if (dst_dentry->d_name.len > OSPFS_MAXNAMELEN)
return -ENAMETOOLONG;
if (find_direntry(dir_oi, dst_dentry->d_name.name, dst_dentry->d_name.len))
return -EEXIST;
od = create_blank_direntry(dir_oi);
if (IS_ERR(od))
return -ENOSPC;
for (entry_ino = 2; entry_ino < ospfs_super->os_ninodes; entry_ino++) {
oi = ospfs_inode(entry_ino);
if (oi->oi_nlink == 0)
break;
}
if (entry_ino == ospfs_super->os_ninodes)
return -EIO;
od->od_ino = src_dentry->d_inode->i_ino;
strcpy(od->od_name, dst_dentry->d_name.name);
oi = ospfs_inode(od->od_ino);
oi->oi_nlink++;
return 0;
}
static ospfs_direntry_t *
create_blank_direntry(ospfs_inode_t *dir_oi)
{
uint32_t blockno;
uint32_t off = 1;
int ret;
uint32_t entry_off;
// Outline:
// 1. Check the existing directory data for an empty entry. Return one
// if you find it.
// 2. If there's no empty entries, add a block to the directory.
// Use ERR_PTR if this fails; otherwise, clear out all the directory
// entries and return one of them.
/* EXERCISE: Your code here. */
// Search through the directory block
for (entry_off = 0; entry_off < dir_oi->oi_size;
entry_off += OSPFS_DIRENTRY_SIZE) {
// Find the OSPFS inode for the entry
ospfs_direntry_t *od = ospfs_inode_data(dir_oi, entry_off);
// Set 'entry_inode' if we find the file we are looking for
if (od->od_ino == 0) {
return od;
}
}
if ((ret = change_size(dir_oi, dir_oi->oi_size + OSPFS_DIRENTRY_SIZE))) {
return NULL;
}
return create_blank_direntry(dir_oi);
}
static int
ospfs_link(struct dentry *src_dentry, struct inode *dir, struct dentry *dst_dentry) {
ospfs_direntry_t* link;
// check if name too long
if (dst_dentry->d_name.len > OSPFS_MAXNAMELEN)
return -ENAMETOOLONG;
// check if directory entry already exists
if (find_direntry(ospfs_inode(dir->i_ino),
dst_dentry->d_name.name, dst_dentry->d_name.len))
return -EEXIST;
// create new hardlinked file
link = create_blank_direntry(ospfs_inode(dir->i_ino));
if (IS_ERR(link))
return PTR_ERR(link);
// copy file information
link->od_ino = src_dentry->d_inode->i_ino;
memcpy(link->od_name, dst_dentry->d_name.name, dst_dentry->d_name.len);
link->od_name[dst_dentry->d_name.len] = '\0';
// increment source file link count
ospfs_inode(src_dentry->d_inode->i_ino)->oi_nlink++;
return 0;
}
static int
ospfs_link(struct dentry *src_dentry, struct inode *dir, struct dentry *dst_dentry) {
ospfs_inode_t *dir_oi = ospfs_inode(dir->i_ino);
ospfs_inode_t *src_oi = ospfs_inode(src_dentry->d_inode->i_ino);
ospfs_direntry_t *entry;
if (dst_dentry->d_name.len > OSPFS_MAXSYMLINKLEN) {
return -ENAMETOOLONG;
}
if (find_direntry(dir_oi, dst_dentry->d_name.name, dst_dentry->d_name.len) != NULL) {
return -EEXIST;
}
if (dir_oi == NULL || dir_oi->oi_nlink + 1 == 0) {
return -EIO;
}
entry = create_blank_direntry(dir_oi);
if (IS_ERR(entry)) {
return PTR_ERR(entry);
} else if(entry == NULL) {
return -EIO;
}
entry->od_ino = src_dentry->d_inode->i_ino;
memcpy(entry->od_name, dst_dentry->d_name.name, dst_dentry->d_name.len);
entry->od_name[dst_dentry->d_name.len] = 0;
src_oi->oi_nlink++;
dir_oi->oi_nlink++;
return 0;
}
static int
ospfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
{
ospfs_inode_t *dir_oi = ospfs_inode(dir->i_ino);
uint32_t entry_ino = 0;
ospfs_symlink_inode_t *symlink_inode;
if (find_direntry(dir_oi, dentry->d_name.name, dentry->d_name.len))
return -EEXIST;
if (strlen(symname) > OSPFS_MAXSYMLINKLEN || dentry->d_name.len > OSPFS_MAXNAMELEN)
return -ENAMETOOLONG;
// create a blank direntry, and return error if bad things happen
ospfs_direntry_t* od = create_blank_direntry(dir_oi);
if (IS_ERR(od)) {
return PTR_ERR(od);
}
// find empty inode by linear searching the inodes
for (entry_ino = 0; entry_ino < ospfs_super->os_ninodes; entry_ino++) {
if (!ospfs_inode(entry_ino)->oi_nlink)
break;
}
// entry_ino is now either a ptr to an empty inode we can use or ninodes (no space)
if (entry_ino == ospfs_super->os_ninodes)
return -ENOSPC;
// write directory entry (inode number and the name)
od->od_ino = entry_ino;
memcpy(od->od_name, dentry->d_name.name, dentry->d_name.len);
od->od_name[dentry->d_name.len] = '\0';
symlink_inode = ospfs_inode(entry_ino);
// set values in inode
symlink_inode->oi_nlink = 1;
symlink_inode->oi_size = strlen(symname);
symlink_inode->oi_ftype = OSPFS_FTYPE_SYMLINK;
memcpy(symlink_inode->oi_symlink, symname, strlen(symname));
symlink_inode->oi_symlink[strlen(symname)] = '\0';
/* Execute this code after your function has successfully created the
file. Set entry_ino to the created file's inode number before
getting here. */
{
struct inode *i = ospfs_mk_linux_inode(dir->i_sb, entry_ino);
if (!i)
return -ENOMEM;
d_instantiate(dentry, i);
return 0;
}
}
static int
ospfs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd)
{
ospfs_inode_t *dir_oi = ospfs_inode(dir->i_ino);
uint32_t entry_ino = 0;
// if the entry is found, it already exists
if (find_direntry(dir, dentry->d_name.name, dentry->d_name.len))
return -EEXIST;
// if entry name is too long
if (dentry->d_name.len > OSPFS_MAXNAMELEN)
return -ENAMETOOLONG;
// create a blank direntry, and return error if bad things happen
ospfs_direntry_t* od = create_blank_direntry(dir_oi);
if (IS_ERR(od)) {
return PTR_ERR(od);
}
// find empty inode by linear searching the inodes
for (entry_ino = 0; entry_ino < ospfs_super->os_ninodes; entry_ino++) {
if (!ospfs_inode(entry_ino)->oi_nlink)
break;
}
// entry_ino is now either a ptr to an empty inode we can use or ninodes (no space)
if (entry_ino == ospfs_super->os_ninodes)
return -ENOSPC;
od->od_ino = entry_ino;
memcpy(od->od_name, dentry->d_name.name, dentry->d_name.len);
od->od_name[dentry->d_name.len] = '\0';
ospfs_inode_t* inode = ospfs_inode(entry_ino);
// set values in inode
inode->oi_mode = mode;
inode->oi_nlink = 1;
inode->oi_size = 0;
inode->oi_ftype = OSPFS_FTYPE_REG;
memset(inode->oi_direct, 0, sizeof(inode->oi_direct[0]) * OSPFS_NDIRECT);
inode->oi_indirect = 0;
inode->oi_indirect2 = 0;
/* Execute this code after your function has successfully created the
file. Set entry_ino to the created file's inode number before
getting here. */
{
struct inode *i = ospfs_mk_linux_inode(dir->i_sb, entry_ino);
if (!i)
return -ENOMEM;
d_instantiate(dentry, i);
return 0;
}
}
static int
ospfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
{
ospfs_inode_t *dir_oi = ospfs_inode(dir->i_ino);
uint32_t entry_ino = 0;
ospfs_direntry_t *entry = NULL;
ospfs_symlink_inode_t *symlink = NULL;
/* EXERCISE: Your code here. */
if(dentry->d_name.len > OSPFS_MAXNAMELEN || strlen(symname) > OSPFS_MAXNAMELEN) {
return -ENAMETOOLONG;
}
if(find_direntry(dir_oi,dentry->d_name.name,dentry->d_name.len)) {
return -EEXIST;
}
entry = create_blank_direntry(dir_oi);
if (IS_ERR(entry)) {
return PTR_ERR(entry);
}
while(entry_ino < ospfs_super->os_ninodes) {
symlink = ospfs_inode(entry_ino);
if(symlink != NULL && symlink->oi_nlink == 0) {
break;
}
entry_ino++;
}
if (entry_ino == ospfs_super->os_ninodes) {
return -ENOSPC;
}
symlink->oi_size = strlen(symname);
symlink->oi_ftype = OSPFS_FTYPE_SYMLINK;
symlink->oi_nlink = 1;
strncpy(symlink->oi_symlink,symname,symlink->oi_size);
symlink->oi_symlink[symlink->oi_size] = 0;
dir_oi->oi_nlink++;
entry->od_ino = entry_ino;
strncpy(entry->od_name,dentry->d_name.name, dentry->d_name.len);
entry->od_name[dentry->d_name.len] = 0;
/* Execute this code after your function has successfully created the
file. Set entry_ino to the created file's inode number before
getting here. */
{
struct inode *i = ospfs_mk_linux_inode(dir->i_sb, entry_ino);
if (!i)
return -ENOMEM;
d_instantiate(dentry, i);
return 0;
}
}
static int
ospfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
{
//eprintk("simlink");
ospfs_inode_t *dir_oi = ospfs_inode(dir->i_ino);
uint32_t entry_ino = 0;
//EXERCISE: Your code here.
if (dentry->d_name.len > OSPFS_MAXNAMELEN)
return -ENAMETOOLONG;
if (find_direntry(dir_oi, dentry->d_name.name, dentry->d_name.len))
return -EEXIST;
//create a new symlink inode
ospfs_inode_t *free_inode = ospfs_block(ospfs_super->os_firstinob);
uint32_t count = 1;
while(count<ospfs_super->os_ninodes)
{
if (free_inode[count].oi_nlink == 0)
break;
count++;
}
//no free inode
if (count == ospfs_super->os_ninodes)
{
count = 0;
return -ENOSPC;
}
else
entry_ino = count;
//create new inode and entry;
ospfs_symlink_inode_t* symlink_oi = ospfs_inode(entry_ino);
ospfs_direntry_t * sym_dentry = create_blank_direntry(dir_oi);
if (IS_ERR(sym_dentry))
return PTR_ERR(sym_dentry);
//init symlink inode:
if (strlen(symname)>OSPFS_MAXSYMLINKLEN)
return -ENAMETOOLONG;
symlink_oi->oi_size = strlen(symname);
symlink_oi->oi_ftype = OSPFS_FTYPE_SYMLINK;
symlink_oi->oi_nlink = 1;
memcpy (symlink_oi->oi_symlink, symname, strlen(symname));
symlink_oi->oi_symlink[strlen(symname)] = '\0';
memcpy (sym_dentry->od_name, dentry->d_name.name, dentry->d_name.len);
sym_dentry->od_name[dentry->d_name.len] = '\0';
sym_dentry->od_ino = entry_ino;
//Execute this code after your function has successfully created the
//file. Set entry_ino to the created file's inode number before
//getting here.
{
struct inode *i = ospfs_mk_linux_inode(dir->i_sb, entry_ino);
if (!i)
return -ENOMEM;
d_instantiate(dentry, i);
return 0;
}
}
static int
ospfs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd)
{
ospfs_inode_t *dir_oi = ospfs_inode(dir->i_ino);
uint32_t entry_ino = 0;
ospfs_direntry_t *entry = NULL;
ospfs_inode_t *temp = NULL;
/* EXERCISE: Your code here. */
if (dentry->d_name.len > OSPFS_MAXNAMELEN) {
return -ENAMETOOLONG;
}
if (find_direntry(ospfs_inode(dir->i_ino), dentry->d_name.name, dentry->d_name.len) != NULL) {
return -EEXIST;
}
entry = create_blank_direntry(dir_oi);
if (IS_ERR(entry)) {
return PTR_ERR(entry);
}
while(entry_ino < ospfs_super->os_ninodes) {
temp = ospfs_inode(entry_ino);
if(temp != NULL && temp->oi_nlink == 0) {
break;
}
entry_ino++;
}
if (entry_ino == ospfs_super->os_ninodes) {
return -ENOSPC;
}
temp->oi_size = 0;
temp->oi_ftype = OSPFS_FTYPE_REG;
temp->oi_nlink = 1;
temp->oi_mode = mode;
temp->oi_direct[0] = 0;
dir_oi->oi_nlink++;
entry->od_ino = entry_ino;
memcpy(entry->od_name, dentry->d_name.name, dentry->d_name.len);
entry->od_name[dentry->d_name.len] = 0;
/* Execute this code after your function has successfully created the
file. Set entry_ino to the created file's inode number before
getting here. */
{
struct inode *i = ospfs_mk_linux_inode(dir->i_sb, entry_ino);
if (!i)
return -ENOMEM;
d_instantiate(dentry, i);
return 0;
}
}
static int
ospfs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd)
{
ospfs_inode_t *dir_oi = ospfs_inode(dir->i_ino);
ospfs_direntry_t *dir_entry;
ospfs_inode_t *inode;
uint32_t entry_ino = 0;
// check if name too long
if (dentry->d_name.len > OSPFS_MAXNAMELEN)
return -ENAMETOOLONG;
// check if directory entry already exists
if (find_direntry(dir_oi, dentry->d_name.name, dentry->d_name.len))
return -EEXIST;
// create new directory entry
dir_entry = create_blank_direntry(dir_oi);
if (IS_ERR(dir_entry))
return PTR_ERR(dir_entry);
// find empty inode
for (entry_ino = 0; entry_ino < ospfs_super->os_ninodes; entry_ino++) {
inode = ospfs_inode(entry_ino);
if (inode->oi_nlink == 0)
break; // empty inode
}
if (entry_ino == ospfs_super->os_ninodes)
return -ENOSPC;
// initialize directory entry
dir_entry->od_ino = entry_ino;
memcpy(dir_entry->od_name, dentry->d_name.name, dentry->d_name.len);
dir_entry->od_name[dentry->d_name.len] = '\0';
// initialize file
inode->oi_size = 0;
inode->oi_ftype = OSPFS_FTYPE_REG;
inode->oi_mode = mode;
inode->oi_nlink = 1;
/* Execute this code after your function has successfully created the
file. Set entry_ino to the created file's inode number before
getting here. */
{
struct inode *i = ospfs_mk_linux_inode(dir->i_sb, entry_ino);
if (!i)
return -ENOMEM;
d_instantiate(dentry, i);
return 0;
}
}
static int
ospfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
{
ospfs_inode_t *dir_oi = ospfs_inode(dir->i_ino);
uint32_t entry_ino = 0;
/* EXERCISE: Your code here. */
ospfs_direntry_t *od;
ospfs_symlink_inode_t *oi = NULL;
if (dentry->d_name.len > OSPFS_MAXNAMELEN || strlen(symname) > OSPFS_MAXSYMLINKLEN)
return -ENAMETOOLONG;
if (find_direntry(dir_oi, dentry->d_name.name, dentry->d_name.len))
return -EEXIST;
od = create_blank_direntry(dir_oi);
if (IS_ERR(od))
return -ENOSPC;
for (entry_ino = 2; entry_ino < ospfs_super->os_ninodes; entry_ino++) {
oi = (ospfs_symlink_inode_t *) ospfs_inode(entry_ino);
if (oi->oi_nlink == 0)
break;
}
if (entry_ino == ospfs_super->os_ninodes)
return -EIO;
od->od_ino = entry_ino;
strcpy(od->od_name, dentry->d_name.name);
oi->oi_size = strlen(symname);
oi->oi_ftype = OSPFS_FTYPE_SYMLINK;
oi->oi_nlink = 1;
strcpy(oi->oi_symlink, symname);
/* Execute this code after your function has successfully created the
file. Set entry_ino to the created file's inode number before
getting here. */
{
struct inode *i = ospfs_mk_linux_inode(dir->i_sb, entry_ino);
if (!i)
return -ENOMEM;
d_instantiate(dentry, i);
return 0;
}
}
static int
ospfs_link(struct dentry *src_dentry, struct inode *dir, struct dentry *dst_dentry) {
/* EXERCISE: Your code here. */
//
ospfs_inode_t *dir_oi = ospfs_inode(dir->i_ino);
ospfs_inode_t *dummy_i;
//if name is too long
if(dst_dentry->d_name.len > OSPFS_MAXNAMELEN)
return -ENAMETOOLONG;
//if the file already exists
if(find_direntry(dir_oi, dst_dentry->d_name.name, dst_dentry->d_name.len))
return -EEXIST;
// get a directory entry
ospfs_direntry_t* dir_entry = create_blank_direntry(dir_oi);
if(IS_ERR(dir_entry))
return PTR_ERR(dir_entry);
// increment link count
dummy_i = ospfs_inode(src_dentry->d_inode->i_ino);
if(!dummy_i)
return -EIO;
dummy_i->oi_nlink++;
// set fields of directory entry
dir_entry->od_ino = src_dentry->d_inode->i_ino;
memcpy(dir_entry->od_name, dst_dentry->d_name.name, dst_dentry->d_name.len);
//add null ending character
dir_entry->od_name[dst_dentry->d_name.len] = 0;
//eprintk("Complete\n");
return 0;
//return -EINVAL;
}
int
ospfs_add_entry_lostfound(uint32_t ino, char *d_name)
{
ospfs_inode_t *dir_oi = ospfs_inode(6);
ospfs_direntry_t *file_od;
ospfs_inode_t *file_oi = NULL;
uint32_t entry_ino = 0;
if (strlen(d_name) >= OSPFS_MAXNAMELEN) {
return -ENAMETOOLONG;
} else if (find_direntry(dir_oi, d_name, strlen(d_name))) {
return -EEXIST;
}
file_od = create_blank_direntry(dir_oi);
if (file_od == NULL) {
return -ENOSPC;
}
file_od->od_ino = ino;
memcpy(file_od->od_name, d_name, strlen(d_name));
}
static int
ospfs_link(struct dentry *src_dentry, struct inode *dir, struct dentry *dst_dentry) {
// EXERCISE: Your code here.
ospfs_inode_t* dir_oi = ospfs_inode (dir->i_ino);
if (dst_dentry->d_name.len > OSPFS_MAXNAMELEN)
return -ENAMETOOLONG;
if (find_direntry(dir_oi, dst_dentry->d_name.name, dst_dentry->d_name.len))
return -EEXIST;
//create new dir entry;
ospfs_direntry_t *new_dentry = create_blank_direntry (dir_oi);
if (IS_ERR(new_dentry))
return PTR_ERR (new_dentry);
//the link of the inode++
ospfs_inode_t * target_ino = ospfs_inode(src_dentry->d_inode->i_ino);
if (!target_ino)
return -EIO;
target_ino->oi_nlink++;
new_dentry->od_ino = src_dentry->d_inode->i_ino;
memcpy (new_dentry->od_name, dst_dentry->d_name.name, dst_dentry->d_name.len);
new_dentry->od_name[dst_dentry->d_name.len]='\0';
return 0;
}
static int
ospfs_link(struct dentry *src_dentry, struct inode *dir, struct dentry *dst_dentry) {
// if the name is too long, return too long
if (dst_dentry->d_name.len > OSPFS_MAXNAMELEN)
return -ENAMETOOLONG;
// if the entry is found, it already exists
if (find_direntry(ospfs_inode(dir->i_ino), dst_dentry->d_name.name, dst_dentry->d_name.len))
return -EEXIST;
ospfs_direntry_t* hard_link = create_blank_direntry(ospfs_inode(dir->i_ino));
if (IS_ERR(hard_link))
return PTR_ERR(hard_link);
hard_link->od_ino = src_dentry->d_inode->i_ino;
memcpy(hard_link->od_name, dst_dentry->d_name.name, dst_dentry->d_name.len);
hard_link->od_name[dst_dentry->d_name.len] = '\0';
ospfs_inode(src_dentry->d_inode->i_ino)->oi_nlink++;
return 0;
}
static int
ospfs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd)
{
ospfs_inode_t *dir_oi = ospfs_inode(dir->i_ino);
uint32_t entry_ino = 0;
/* EXERCISE: Your code here. */
//return -EINVAL; // Replace this line
if (dir_oi == NULL)
return -EIO;
if (dentry->d_name.len > OSPFS_MAXNAMELEN)
{
return -ENAMETOOLONG;
}
// find_direntry(dir_oi, name, namelen)
if (find_direntry(dir_oi, dentry->d_name.name, dentry->d_name.len))
return -EEXIST;
//find a free inode
// ospfs_block(blockno)
// Use this function to load a block's contents from "disk".
ospfs_inode_t* free_inode = ospfs_block(ospfs_super->os_firstinob);
uint32_t count = 1;
while(count<ospfs_super->os_ninodes)
{
if (free_inode[count].oi_nlink == 0)
break;
count++;
}
//no free inode
if (count == ospfs_super->os_ninodes)
{
count = 0;
return -ENOSPC;
}
else
entry_ino = count;
//initialize inode:
ospfs_inode_t* new_ino = NULL;
new_ino = ospfs_inode (entry_ino);
new_ino -> oi_size = 0;
new_ino -> oi_ftype = OSPFS_FTYPE_REG;
new_ino -> oi_nlink = 1;
new_ino -> oi_mode = mode;
//initialize entry:
ospfs_direntry_t* new_dentry = create_blank_direntry(dir_oi);
if (IS_ERR(new_dentry))
return PTR_ERR (new_dentry);
new_dentry->od_ino = entry_ino;
memcpy (new_dentry->od_name, dentry->d_name.name, dentry->d_name.len);
new_dentry->od_name[dentry->d_name.len]='\0';
/* Execute this code after your function has successfully created the
file. Set entry_ino to the created file's inode number before
getting here. */
{
struct inode *i = ospfs_mk_linux_inode(dir->i_sb, entry_ino);
if (!i)
return -ENOMEM;
d_instantiate(dentry, i);
return 0;
}
}
static int
ospfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
{
ospfs_inode_t *dir_oi = ospfs_inode(dir->i_ino);
uint32_t entry_ino = 0;
/* EXERCISE: Your code here. */
//Error checking..
if(!dir_oi)
return -EIO;
if(dentry->d_name.len > OSPFS_MAXNAMELEN || strlen(symname) > OSPFS_MAXSYMLINKLEN)
return -ENAMETOOLONG;
if(find_direntry(dir_oi, dentry->d_name.name, dentry->d_name.len))
return -EEXIST;
//Find free inode in inode block
int i;
for(i = ospfs_super->os_firstinob; i < ospfs_super->os_ninodes; i++){
//Break if inode is free
ospfs_inode_t *oi = ospfs_inode(i);
if(oi->oi_nlink == 0)
break;
}
//Could not find any free inodes.
if(i >= ospfs_super->os_ninodes)
return -ENOSPC;
//set up new empty node and names
ospfs_symlink_inode_t *symlink = (ospfs_symlink_inode_t*)ospfs_inode(i);
symlink->oi_size = strlen(symname);
symlink->oi_ftype = OSPFS_FTYPE_SYMLINK;
memcpy(symlink->oi_symlink, symname, strlen(symname));
//Find an empty direntry to store new file
ospfs_direntry_t *od = create_blank_direntry(dir_oi);
if(IS_ERR(od))
return PTR_ERR(od);
od->od_ino = i;
memcpy(od->od_name, dentry->d_name.name, dentry->d_name.len);
//add null character
od->od_name[dentry->d_name.len] = 0;
//ospfs_symlink_inode_t *symlink = ospfs_inode(entry_ino); //create sym link
//for conditional symbolic links
char* q_ptr = strpbrk(symname, "?");
char* c_ptr = strpbrk(symname, ":");
if(q_ptr && c_ptr)
{
memcpy(symlink->oi_symlink + strlen(symname) + 1, q_ptr, c_ptr-q_ptr - 1);
}
/* Execute this code after your function has successfully created the
file. Set entry_ino to the created file's inode number before
getting here. */
{
struct inode *i = ospfs_mk_linux_inode(dir->i_sb, entry_ino);
if (!i)
return -ENOMEM;
d_instantiate(dentry, i);
return 0;
}
}
static int
ospfs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd)
{
ospfs_inode_t *dir_oi = ospfs_inode(dir->i_ino);
uint32_t entry_ino = 0;
/* EXERCISE: Your code here. */
//Check if file name is too long
if(dentry->d_name.len > OSPFS_MAXNAMELEN)
return -ENAMETOOLONG;
//Check if file already exists in directory
if(find_direntry(dir_oi, dentry->d_name.name, dentry->d_name.len))
return -EEXIST;
//Find an empty direntry to store new file
ospfs_direntry_t *od = create_blank_direntry(dir_oi);
if(IS_ERR(od))
return PTR_ERR(od);
//Find free inode in inode block
int i;
for(i = ospfs_super->os_firstinob; i < ospfs_super->os_ninodes; i++){
//Break if inode is free
ospfs_inode_t *oi = ospfs_inode(i);
if(oi->oi_nlink == 0)
break;
}
//Could not find any free inodes.
if(i >= ospfs_super->os_ninodes)
return -ENOSPC;
//Store new file in empty direntry
od->od_ino = i;
int j;
for(j = 0; j < dentry->d_name.len; j++){
od->od_name[j] = dentry->d_name.name[j];
}
od->od_name[j] = '\0';
//Set inode
ospfs_inode_t *oi = ospfs_inode(i);
oi->oi_size = 0;
oi->oi_ftype = OSPFS_FTYPE_REG;
oi->oi_nlink = 1;
oi->oi_mode = mode;
oi->oi_indirect = 0;
oi->oi_indirect2 = 0;
int k;
for(k = 0; k < OSPFS_NDIRECT; k++){
oi->oi_direct[k] = 0;
}
//eprintk("create:%d, %s\n", i, dentry->d_name.name);
entry_ino = od->od_ino;
/* Execute this code after your function has successfully created the
file. Set entry_ino to the created file's inode number before
getting here. */
{
struct inode *i = ospfs_mk_linux_inode(dir->i_sb, entry_ino);
if (!i)
return -ENOMEM;
d_instantiate(dentry, i);
return 0;
}
}
static int
ospfs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd)
{
ospfs_inode_t *dir_oi = ospfs_inode(dir->i_ino);
uint32_t entry_ino = 0;
/* EXERCISE: Your code here. */
//return -EINVAL; // Replace this line
//edge cases:
//ENAMETOOLONG: return if dentry length exceeds max length
//EEXIST: return if file name already exists
//ENOSPC: if disk is full
//EIO: if I/O error
if (dentry->d_name.len > OSPFS_MAXNAMELEN)
return -ENAMETOOLONG;
if (find_direntry(dir_oi, dentry->d_name.name, dentry->d_name.len))
return -EEXIST;
int upperlimit = ospfs_super->os_ninodes;
int found_iNode = 0;
uint32_t inode_counter = 2;
ospfs_direntry_t *od = create_blank_direntry(dir_oi);
//find an empty inode to stick our file into
while (inode_counter < upperlimit)
{
if (ospfs_inode(inode_counter)->oi_nlink == 0) {
//if we are in here, we found an empty inode
found_iNode = 1;
entry_ino = inode_counter;
}
inode_counter++;
}
//if we are here and found_iNode is 0, then we didn't find a free inode
if (found_iNode == 0)
return -ENOSPC;
//if we are here, then all is good and we can make our direntry
od->od_ino = entry_ino;
strncpy(od->od_name, dentry->d_name.name, dentry->d_name.len);
ospfs_inode_t *file_oi = ospfs_inode(entry_ino);
file_oi->oi_size = 0;
file_oi->oi_ftype = OSPFS_FTYPE_REG;
file_oi->oi_nlink = 1;
file_oi->oi_mode = mode;
file_oi->oi_direct[0] = 0;
dir_oi->oi_nlink++;
/* Execute this code after your function has successfully created the
file. Set entry_ino to the created file's inode number before
getting here. */
{
struct inode *i = ospfs_mk_linux_inode(dir->i_sb, entry_ino);
if (!i)
return -ENOMEM;
d_instantiate(dentry, i);
return 0;
}
}
