/*
* cap_readdir()
*
* This is the readdir() entry in the file_operations structure for
* HFS directories in the CAP scheme. The purpose is to enumerate the
* entries in a directory, given the inode of the directory and a
* (struct file *), the 'f_pos' field of which indicates the location
* in the directory. The (struct file *) is updated so that the next
* call with the same 'dir' and 'filp' arguments will produce the next
* directory entry. The entries are returned in 'dirent', which is
* "filled-in" by calling filldir(). This allows the same readdir()
* function be used for different dirent formats. We try to read in
* as many entries as we can before filldir() refuses to take any more.
*
* XXX: In the future it may be a good idea to consider not generating
* metadata files for covered directories since the data doesn't
* correspond to the mounted directory. However this requires an
* iget() for every directory which could be considered an excessive
* amount of overhead. Since the inode for a mount point is always
* in-core this is another argument for a call to get an inode if it
* is in-core or NULL if it is not.
*/
static int cap_readdir(struct file * filp,
void * dirent, filldir_t filldir)
{
ino_t type;
int skip_dirs;
struct hfs_brec brec;
struct hfs_cat_entry *entry;
struct inode *dir = filp->f_dentry->d_inode;
entry = HFS_I(dir)->entry;
type = HFS_ITYPE(dir->i_ino);
skip_dirs = (type == HFS_CAP_RDIR);
if (filp->f_pos == 0) {
/* Entry 0 is for "." */
if (filldir(dirent, DOT->Name, DOT_LEN, 0, dir->i_ino, DT_DIR)) {
return 0;
}
filp->f_pos = 1;
}
if (filp->f_pos == 1) {
/* Entry 1 is for ".." */
hfs_u32 cnid;
if (type == HFS_CAP_NDIR) {
cnid = hfs_get_nl(entry->key.ParID);
} else {
cnid = entry->cnid;
}
if (filldir(dirent, DOT_DOT->Name,
DOT_DOT_LEN, 1, ntohl(cnid), DT_DIR)) {
return 0;
}
filp->f_pos = 2;
}
if (filp->f_pos < (dir->i_size - 3)) {
hfs_u32 cnid;
hfs_u8 type;
if (hfs_cat_open(entry, &brec) ||
hfs_cat_next(entry, &brec, filp->f_pos - 2, &cnid, &type)) {
return 0;
}
while (filp->f_pos < (dir->i_size - 3)) {
if (hfs_cat_next(entry, &brec, 1, &cnid, &type)) {
return 0;
}
if (!skip_dirs || (type != HFS_CDR_DIR)) {
ino_t ino;
unsigned int len;
unsigned char tmp_name[HFS_NAMEMAX];
ino = ntohl(cnid) | HFS_I(dir)->file_type;
len = hfs_namein(dir, tmp_name,
&((struct hfs_cat_key *)brec.key)->CName);
if (filldir(dirent, tmp_name, len,
filp->f_pos, ino, DT_UNKNOWN)) {
hfs_cat_close(entry, &brec);
return 0;
}
}
++filp->f_pos;
}
hfs_cat_close(entry, &brec);
}
if (filp->f_pos == (dir->i_size - 3)) {
if ((entry->cnid == htonl(HFS_ROOT_CNID)) &&
(type == HFS_CAP_NDIR)) {
/* In root dir last-2 entry is for ".rootinfo" */
if (filldir(dirent, DOT_ROOTINFO->Name,
DOT_ROOTINFO_LEN, filp->f_pos,
ntohl(entry->cnid) | HFS_CAP_FNDR,
DT_UNKNOWN)) {
return 0;
}
}
++filp->f_pos;
}
if (filp->f_pos == (dir->i_size - 2)) {
if (type == HFS_CAP_NDIR) {
/* In normal dirs last-1 entry is for ".finderinfo" */
if (filldir(dirent, DOT_FINDERINFO->Name,
DOT_FINDERINFO_LEN, filp->f_pos,
ntohl(entry->cnid) | HFS_CAP_FDIR,
DT_UNKNOWN)) {
return 0;
}
}
++filp->f_pos;
}
if (filp->f_pos == (dir->i_size - 1)) {
if (type == HFS_CAP_NDIR) {
/* In normal dirs last entry is for ".resource" */
if (filldir(dirent, DOT_RESOURCE->Name,
DOT_RESOURCE_LEN, filp->f_pos,
ntohl(entry->cnid) | HFS_CAP_RDIR,
DT_UNKNOWN)) {
return 0;
}
}
++filp->f_pos;
}
return 0;
}
/*
* nat_readdir()
*
* This is the readdir() entry in the file_operations structure for
* HFS directories in the netatalk scheme. The purpose is to
* enumerate the entries in a directory, given the inode of the
* directory and a struct file which indicates the location in the
* directory. The struct file is updated so that the next call with
* the same dir and filp will produce the next directory entry. The
* entries are returned in dirent, which is "filled-in" by calling
* filldir(). This allows the same readdir() function be used for
* different dirent formats. We try to read in as many entries as we
* can before filldir() refuses to take any more.
*
* Note that the Netatalk format doesn't have the problem with
* metadata for covered directories that exists in the other formats,
* since the metadata is contained within the directory.
*/
static int nat_readdir(struct inode * dir, struct file * filp,
void * dirent, filldir_t filldir)
{
ino_t type;
int skip_dirs;
struct hfs_brec brec;
struct hfs_cat_entry *entry;
if (!dir || !dir->i_sb || !S_ISDIR(dir->i_mode)) {
return -EBADF;
}
entry = HFS_I(dir)->entry;
type = HFS_ITYPE(dir->i_ino);
skip_dirs = (type == HFS_NAT_HDIR);
if (filp->f_pos == 0) {
/* Entry 0 is for "." */
if (filldir(dirent, DOT->Name, DOT_LEN, 0, dir->i_ino)) {
return 0;
}
filp->f_pos = 1;
}
if (filp->f_pos == 1) {
/* Entry 1 is for ".." */
hfs_u32 cnid;
if (type == HFS_NAT_NDIR) {
cnid = hfs_get_nl(entry->key.ParID);
} else {
cnid = entry->cnid;
}
if (filldir(dirent, DOT_DOT->Name,
DOT_DOT_LEN, 1, ntohl(cnid))) {
return 0;
}
filp->f_pos = 2;
}
if (filp->f_pos < (dir->i_size - 1)) {
hfs_u32 cnid;
hfs_u8 type;
if (hfs_cat_open(entry, &brec) ||
hfs_cat_next(entry, &brec, filp->f_pos - 2, &cnid, &type)) {
return 0;
}
while (filp->f_pos < (dir->i_size - 1)) {
if (hfs_cat_next(entry, &brec, 1, &cnid, &type)) {
return 0;
}
if (!skip_dirs || (type != HFS_CDR_DIR)) {
ino_t ino;
unsigned int len;
unsigned char tmp_name[HFS_NAMEMAX];
ino = ntohl(cnid) | HFS_I(dir)->file_type;
len = hfs_namein(dir, tmp_name,
&((struct hfs_cat_key *)brec.key)->CName);
if (filldir(dirent, tmp_name, len,
filp->f_pos, ino)) {
hfs_cat_close(entry, &brec);
return 0;
}
}
++filp->f_pos;
}
hfs_cat_close(entry, &brec);
}
if (filp->f_pos == (dir->i_size - 1)) {
if (type == HFS_NAT_NDIR) {
/* In normal dirs entry 2 is for ".AppleDouble" */
if (filldir(dirent, DOT_APPLEDOUBLE->Name,
DOT_APPLEDOUBLE_LEN, filp->f_pos,
ntohl(entry->cnid) | HFS_NAT_HDIR)) {
return 0;
}
} else if (type == HFS_NAT_HDIR) {
/* In .AppleDouble entry 2 is for ".Parent" */
if (filldir(dirent, DOT_PARENT->Name,
DOT_PARENT_LEN, filp->f_pos,
ntohl(entry->cnid) | HFS_NAT_HDR)) {
return 0;
}
}
++filp->f_pos;
}
return 0;
}