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/*
* linux/fs/hpfs/dir.c
*
* Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
*
* directory VFS functions
*/
#include "hpfs_fn.h"
#include <linux/sched.h>
#include <linux/smp_lock.h>
int hpfs_dir_release(struct inode *inode, struct file *filp)
{
lock_kernel();
hpfs_del_pos(inode, &filp->f_pos);
/*hpfs_write_if_changed(inode);*/
unlock_kernel();
return 0;
}
/* This is slow, but it's not used often */
loff_t hpfs_dir_lseek(struct file *filp, loff_t off, int whence)
{
loff_t new_off = off + (whence == 1 ? filp->f_pos : 0);
loff_t pos;
struct quad_buffer_head qbh;
struct inode *i = filp->f_dentry->d_inode;
struct super_block *s = i->i_sb;
/*printk("dir lseek\n");*/
if (new_off == 0 || new_off == 1 || new_off == 11 || new_off == 12 || new_off == 13) goto ok;
hpfs_lock_inode(i);
pos = ((loff_t) hpfs_de_as_down_as_possible(s, i->i_hpfs_dno) << 4) + 1;
while (pos != new_off) {
if (map_pos_dirent(i, &pos, &qbh)) hpfs_brelse4(&qbh);
else goto fail;
if (pos == 12) goto fail;
}
hpfs_unlock_inode(i);
ok:
return filp->f_pos = new_off;
fail:
hpfs_unlock_inode(i);
/*printk("illegal lseek: %016llx\n", new_off);*/
return -ESPIPE;
}
int hpfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
struct inode *inode = filp->f_dentry->d_inode;
struct quad_buffer_head qbh;
struct hpfs_dirent *de;
int lc;
long old_pos;
char *tempname;
int c1, c2 = 0;
if (inode->i_sb->s_hpfs_chk) {
if (hpfs_chk_sectors(inode->i_sb, inode->i_ino, 1, "dir_fnode"))
return -EFSERROR;
if (hpfs_chk_sectors(inode->i_sb, inode->i_hpfs_dno, 4, "dir_dnode"))
return -EFSERROR;
}
if (inode->i_sb->s_hpfs_chk >= 2) {
struct buffer_head *bh;
struct fnode *fno;
int e = 0;
if (!(fno = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh)))
return -EIOERROR;
if (!fno->dirflag) {
e = 1;
hpfs_error(inode->i_sb, "not a directory, fnode %08x",inode->i_ino);
}
if (inode->i_hpfs_dno != fno->u.external[0].disk_secno) {
e = 1;
hpfs_error(inode->i_sb, "corrupted inode: i_hpfs_dno == %08x, fnode -> dnode == %08x", inode->i_hpfs_dno, fno->u.external[0].disk_secno);
}
brelse(bh);
if (e) return -EFSERROR;
}
lc = inode->i_sb->s_hpfs_lowercase;
if (filp->f_pos == 12) { /* diff -r requires this (note, that diff -r */
filp->f_pos = 13; /* also fails on msdos filesystem in 2.0) */
return 0;
}
if (filp->f_pos == 13) return -ENOENT;
hpfs_lock_inode(inode);
while (1) {
again:
/* This won't work when cycle is longer than number of dirents
accepted by filldir, but what can I do?
maybe killall -9 ls helps */
if (inode->i_sb->s_hpfs_chk)
if (hpfs_stop_cycles(inode->i_sb, filp->f_pos, &c1, &c2, "hpfs_readdir")) {
hpfs_unlock_inode(inode);
return -EFSERROR;
}
if (filp->f_pos == 12) {
hpfs_unlock_inode(inode);
return 0;
}
if (filp->f_pos == 3 || filp->f_pos == 4 || filp->f_pos == 5) {
printk("HPFS: warning: pos==%d\n",(int)filp->f_pos);
hpfs_unlock_inode(inode);
return 0;
}
if (filp->f_pos == 0) {
if (filldir(dirent, ".", 1, filp->f_pos, inode->i_ino, DT_DIR) < 0) {
hpfs_unlock_inode(inode);
return 0;
}
filp->f_pos = 11;
}
if (filp->f_pos == 11) {
if (filldir(dirent, "..", 2, filp->f_pos, inode->i_hpfs_parent_dir, DT_DIR) < 0) {
hpfs_unlock_inode(inode);
return 0;
}
filp->f_pos = 1;
}
if (filp->f_pos == 1) {
filp->f_pos = ((loff_t) hpfs_de_as_down_as_possible(inode->i_sb, inode->i_hpfs_dno) << 4) + 1;
hpfs_add_pos(inode, &filp->f_pos);
filp->f_version = inode->i_version;
}
/*if (filp->f_version != inode->i_version) {
hpfs_unlock_inode(inode);
return -ENOENT;
}*/
old_pos = filp->f_pos;
if (!(de = map_pos_dirent(inode, &filp->f_pos, &qbh))) {
hpfs_unlock_inode(inode);
return -EIOERROR;
}
if (de->first || de->last) {
if (inode->i_sb->s_hpfs_chk) {
if (de->first && !de->last && (de->namelen != 2 || de ->name[0] != 1 || de->name[1] != 1)) hpfs_error(inode->i_sb, "hpfs_readdir: bad ^A^A entry; pos = %08x", old_pos);
if (de->last && (de->namelen != 1 || de ->name[0] != 255)) hpfs_error(inode->i_sb, "hpfs_readdir: bad \\377 entry; pos = %08x", old_pos);
}
hpfs_brelse4(&qbh);
goto again;
}
tempname = hpfs_translate_name(inode->i_sb, de->name, de->namelen, lc, de->not_8x3);
if (filldir(dirent, tempname, de->namelen, old_pos, de->fnode, DT_UNKNOWN) < 0) {
filp->f_pos = old_pos;
if (tempname != (char *)de->name) kfree(tempname);
hpfs_brelse4(&qbh);
hpfs_unlock_inode(inode);
return 0;
}
if (tempname != (char *)de->name) kfree(tempname);
hpfs_brelse4(&qbh);
}
}
/*
* lookup. Search the specified directory for the specified name, set
* *result to the corresponding inode.
*
* lookup uses the inode number to tell read_inode whether it is reading
* the inode of a directory or a file -- file ino's are odd, directory
* ino's are even. read_inode avoids i/o for file inodes; everything
* needed is up here in the directory. (And file fnodes are out in
* the boondocks.)
*
* - M.P.: this is over, sometimes we've got to read file's fnode for eas
* inode numbers are just fnode sector numbers; iget lock is used
* to tell read_inode to read fnode or not.
*/
struct dentry *hpfs_lookup(struct inode *dir, struct dentry *dentry)
{
const char *name = dentry->d_name.name;
unsigned len = dentry->d_name.len;
struct quad_buffer_head qbh;
struct hpfs_dirent *de;
ino_t ino;
int err;
struct inode *result = NULL;
if ((err = hpfs_chk_name((char *)name, &len))) {
if (err == -ENAMETOOLONG) return ERR_PTR(-ENAMETOOLONG);
goto end_add;
}
hpfs_lock_inode(dir);
/*
* '.' and '..' will never be passed here.
*/
de = map_dirent(dir, dir->i_hpfs_dno, (char *) name, len, NULL, &qbh);
/*
* This is not really a bailout, just means file not found.
*/
if (!de) goto end;
/*
* Get inode number, what we're after.
*/
ino = de->fnode;
/*
* Go find or make an inode.
*/
hpfs_lock_iget(dir->i_sb, de->directory || (de->ea_size && dir->i_sb->s_hpfs_eas) ? 1 : 2);
if (!(result = iget(dir->i_sb, ino))) {
hpfs_unlock_iget(dir->i_sb);
hpfs_error(dir->i_sb, "hpfs_lookup: can't get inode");
goto bail1;
}
if (!de->directory) result->i_hpfs_parent_dir = dir->i_ino;
hpfs_unlock_iget(dir->i_sb);
hpfs_decide_conv(result, (char *)name, len);
if (de->has_acl || de->has_xtd_perm) if (!(dir->i_sb->s_flags & MS_RDONLY)) {
hpfs_error(result->i_sb, "ACLs or XPERM found. This is probably HPFS386. This driver doesn't support it now. Send me some info on these structures");
goto bail1;
}
/*
* Fill in the info from the directory if this is a newly created
* inode.
*/
if (!result->i_ctime) {
if (!(result->i_ctime = local_to_gmt(dir->i_sb, de->creation_date)))
result->i_ctime = 1;
result->i_mtime = local_to_gmt(dir->i_sb, de->write_date);
result->i_atime = local_to_gmt(dir->i_sb, de->read_date);
result->i_hpfs_ea_size = de->ea_size;
if (!result->i_hpfs_ea_mode && de->read_only)
result->i_mode &= ~0222;
if (!de->directory) {
if (result->i_size == -1) {
result->i_size = de->file_size;
result->i_data.a_ops = &hpfs_aops;
result->u.hpfs_i.mmu_private = result->i_size;
/*
* i_blocks should count the fnode and any anodes.
* We count 1 for the fnode and don't bother about
* anodes -- the disk heads are on the directory band
* and we want them to stay there.
*/
result->i_blocks = 1 + ((result->i_size + 511) >> 9);
}
}
}
hpfs_brelse4(&qbh);
/*
* Made it.
*/
end:
hpfs_unlock_inode(dir);
end_add:
hpfs_set_dentry_operations(dentry);
d_add(dentry, result);
return NULL;
/*
* Didn't.
*/
bail1:
hpfs_brelse4(&qbh);
/*bail:*/
hpfs_unlock_inode(dir);
return ERR_PTR(-ENOENT);
}
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