/*
* build_key()
*
* Build a key for a file by the given name in the given directory.
* If the name matches one of the reserved names returns 1 otherwise 0.
*/
static int build_key(struct hfs_cat_key *key, struct inode *dir,
const char *name, int len)
{
struct hfs_name cname;
const struct hfs_name *reserved;
/* mangle the name */
hfs_nameout(dir, &cname, name, len);
/* check against reserved names */
reserved = HFS_SB(dir->i_sb)->s_reserved1;
while (reserved->Len) {
if (hfs_streq(reserved, &cname)) {
return 1;
}
++reserved;
}
/* check against the names reserved only in the root directory */
if (HFS_I(dir)->entry->cnid == htonl(HFS_ROOT_CNID)) {
reserved = HFS_SB(dir->i_sb)->s_reserved2;
while (reserved->Len) {
if (hfs_streq(reserved, &cname)) {
return 1;
}
++reserved;
}
}
/* build the key */
hfs_cat_build_key(HFS_I(dir)->entry->cnid, &cname, key);
return 0;
}
/*
* nat_hdr_unlink()
*
* This is the unlink() entry in the inode_operations structure for
* Netatalk .AppleDouble directories. The purpose is to delete an
* existing file, given the inode for the parent directory and the name
* (and its length) of the existing file.
*
* WE DON'T ACTUALLY DELETE HEADER THE FILE.
* In non-afpd-compatible mode:
* We return -EPERM.
* In afpd-compatible mode:
* We return success if the file exists or is .Parent.
* Otherwise we return -ENOENT.
*/
static int nat_hdr_unlink(struct inode *dir, const char *name, int len)
{
struct hfs_cat_entry *entry = HFS_I(dir)->entry;
int error = 0;
if (!HFS_SB(dir->i_sb)->s_afpd) {
/* Not in AFPD compatibility mode */
error = -EPERM;
} else {
struct hfs_name cname;
hfs_nameout(dir, &cname, name, len);
if (!hfs_streq(&cname, DOT_PARENT)) {
struct hfs_cat_entry *victim;
struct hfs_cat_key key;
hfs_cat_build_key(entry->cnid, &cname, &key);
victim = hfs_cat_get(entry->mdb, &key);
if (victim) {
/* pretend to succeed */
hfs_cat_put(victim);
} else {
error = -ENOENT;
}
}
}
iput(dir);
return error;
}
/*
* cap_lookup()
*
* This is the lookup() entry in the inode_operations structure for
* HFS directories in the CAP scheme. The purpose is to generate the
* inode corresponding to an entry in a directory, given the inode for
* the directory and the name (and its length) of the entry.
*/
static struct dentry *cap_lookup(struct inode * dir, struct dentry *dentry)
{
ino_t dtype;
struct hfs_name cname;
struct hfs_cat_entry *entry;
struct hfs_cat_key key;
struct inode *inode = NULL;
dentry->d_op = &hfs_dentry_operations;
entry = HFS_I(dir)->entry;
dtype = HFS_ITYPE(dir->i_ino);
/* Perform name-mangling */
hfs_nameout(dir, &cname, dentry->d_name.name,
dentry->d_name.len);
/* no need to check for "." or ".." */
/* Check for special directories if in a normal directory.
Note that cap_dupdir() does an iput(dir). */
if (dtype==HFS_CAP_NDIR) {
/* Check for ".resource", ".finderinfo" and ".rootinfo" */
if (hfs_streq(cname.Name, cname.Len,
DOT_RESOURCE->Name, DOT_RESOURCE_LEN)) {
++entry->count; /* __hfs_iget() eats one */
inode = hfs_iget(entry, HFS_CAP_RDIR, dentry);
goto done;
} else if (hfs_streq(cname.Name, cname.Len,
DOT_FINDERINFO->Name,
DOT_FINDERINFO_LEN)) {
++entry->count; /* __hfs_iget() eats one */
inode = hfs_iget(entry, HFS_CAP_FDIR, dentry);
goto done;
} else if ((entry->cnid == htonl(HFS_ROOT_CNID)) &&
hfs_streq(cname.Name, cname.Len,
DOT_ROOTINFO->Name, DOT_ROOTINFO_LEN)) {
++entry->count; /* __hfs_iget() eats one */
inode = hfs_iget(entry, HFS_CAP_FNDR, dentry);
goto done;
}
}
/* Do an hfs_iget() on the mangled name. */
hfs_cat_build_key(entry->cnid, &cname, &key);
inode = hfs_iget(hfs_cat_get(entry->mdb, &key),
HFS_I(dir)->file_type, dentry);
/* Don't return a resource fork for a directory */
if (inode && (dtype == HFS_CAP_RDIR) &&
(HFS_I(inode)->entry->type == HFS_CDR_DIR)) {
iput(inode); /* this does an hfs_cat_put */
inode = NULL;
}
done:
d_add(dentry, inode);
return NULL;
}
/*
* nat_hdr_rename()
*
* This is the rename() entry in the inode_operations structure for
* Netatalk header directories. The purpose is to rename an existing
* file given the inode for the current directory and the name
* (and its length) of the existing file and the inode for the new
* directory and the name (and its length) of the new file/directory.
*
* WE NEVER MOVE ANYTHING.
* In non-afpd-compatible mode:
* We return -EPERM.
* In afpd-compatible mode:
* If the source header doesn't exist, we return -ENOENT.
* If the destination is not a header directory we return -EPERM.
* We return success if the destination is also a header directory
* and the header exists or is ".Parent".
*/
static int nat_hdr_rename(struct inode *old_dir, const char *old_name,
int old_len, struct inode *new_dir,
const char *new_name, int new_len, int must_be_dir)
{
struct hfs_cat_entry *entry = HFS_I(old_dir)->entry;
int error = 0;
if (!HFS_SB(old_dir->i_sb)->s_afpd) {
/* Not in AFPD compatibility mode */
error = -EPERM;
} else {
struct hfs_name cname;
hfs_nameout(old_dir, &cname, old_name, old_len);
if (!hfs_streq(&cname, DOT_PARENT)) {
struct hfs_cat_entry *victim;
struct hfs_cat_key key;
hfs_cat_build_key(entry->cnid, &cname, &key);
victim = hfs_cat_get(entry->mdb, &key);
if (victim) {
/* pretend to succeed */
hfs_cat_put(victim);
} else {
error = -ENOENT;
}
}
if (!error && (HFS_ITYPE(new_dir->i_ino) != HFS_NAT_HDIR)) {
error = -EPERM;
}
}
iput(old_dir);
iput(new_dir);
return error;
}
/*
* nat_rmdir()
*
* This is the rmdir() entry in the inode_operations structure for
* Netatalk directories. The purpose is to delete an existing
* directory, given the inode for the parent directory and the name
* (and its length) of the existing directory.
*
* We handle .AppleDouble and call hfs_rmdir() for all other cases.
*/
static int nat_rmdir(struct inode *parent, const char *name, int len)
{
struct hfs_cat_entry *entry = HFS_I(parent)->entry;
struct hfs_name cname;
int error;
hfs_nameout(parent, &cname, name, len);
if (hfs_streq(&cname, DOT_APPLEDOUBLE)) {
if (!HFS_SB(parent->i_sb)->s_afpd) {
/* Not in AFPD compatibility mode */
error = -EPERM;
} else if (entry->u.dir.files || entry->u.dir.dirs) {
/* AFPD compatible, but the directory is not empty */
error = -ENOTEMPTY;
} else {
/* AFPD compatible, so pretend to succeed */
error = 0;
}
iput(parent);
} else {
error = hfs_rmdir(parent, name, len);
}
return error;
}
/*
* nat_lookup()
*
* This is the lookup() entry in the inode_operations structure for
* HFS directories in the Netatalk scheme. The purpose is to generate
* the inode corresponding to an entry in a directory, given the inode
* for the directory and the name (and its length) of the entry.
*/
static int nat_lookup(struct inode * dir, const char * name,
int len, struct inode ** result)
{
ino_t dtype;
struct hfs_name cname;
struct hfs_cat_entry *entry;
struct hfs_cat_key key;
struct inode *inode = NULL;
if (!dir || !S_ISDIR(dir->i_mode)) {
goto done;
}
entry = HFS_I(dir)->entry;
dtype = HFS_ITYPE(dir->i_ino);
if (len && !name) {
*result = NULL;
iput(dir);
return -EINVAL;
}
/* Perform name-mangling */
hfs_nameout(dir, &cname, name, len);
/* Check for "." */
if (hfs_streq(&cname, DOT)) {
/* this little trick skips the iget and iput */
*result = dir;
return 0;
}
/* Check for "..". */
if (hfs_streq(&cname, DOT_DOT)) {
struct hfs_cat_entry *parent;
if (dtype != HFS_NAT_NDIR) {
/* Case for ".." in ".AppleDouble" */
parent = entry;
++entry->count; /* __hfs_iget() eats one */
} else {
/* Case for ".." in a normal directory */
parent = hfs_cat_parent(entry);
}
inode = __hfs_iget(parent, HFS_NAT_NDIR, 0);
goto done;
}
/* Check for ".AppleDouble" if in a normal directory,
and for ".Parent" in ".AppleDouble". */
if (dtype==HFS_NAT_NDIR) {
/* Check for ".AppleDouble" */
if (hfs_streq(&cname, DOT_APPLEDOUBLE)) {
++entry->count; /* __hfs_iget() eats one */
inode = __hfs_iget(entry, HFS_NAT_HDIR, 1);
goto done;
}
} else if (dtype==HFS_NAT_HDIR) {
if (hfs_streq(&cname, DOT_PARENT)) {
++entry->count; /* __hfs_iget() eats one */
inode = __hfs_iget(entry, HFS_NAT_HDR, 0);
goto done;
}
}
/* Do an hfs_iget() on the mangled name. */
hfs_cat_build_key(entry->cnid, &cname, &key);
inode = hfs_iget(entry->mdb, &key, HFS_I(dir)->file_type);
/* Don't return a header file for a directory other than .Parent */
if (inode && (dtype == HFS_NAT_HDIR) &&
(HFS_I(inode)->entry != entry) &&
(HFS_I(inode)->entry->type == HFS_CDR_DIR)) {
iput(inode);
inode = NULL;
}
done:
iput(dir);
*result = inode;
return inode ? 0 : -ENOENT;
}