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1275 |
phoenix |
/*
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* linux/fs/hpfs/dir.c
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*
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* Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
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*
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* directory VFS functions
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*/
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#include "hpfs_fn.h"
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#include <linux/sched.h>
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#include <linux/smp_lock.h>
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int hpfs_dir_release(struct inode *inode, struct file *filp)
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{
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lock_kernel();
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hpfs_del_pos(inode, &filp->f_pos);
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/*hpfs_write_if_changed(inode);*/
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unlock_kernel();
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return 0;
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}
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/* This is slow, but it's not used often */
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loff_t hpfs_dir_lseek(struct file *filp, loff_t off, int whence)
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{
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loff_t new_off = off + (whence == 1 ? filp->f_pos : 0);
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loff_t pos;
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struct quad_buffer_head qbh;
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struct inode *i = filp->f_dentry->d_inode;
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struct super_block *s = i->i_sb;
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/*printk("dir lseek\n");*/
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if (new_off == 0 || new_off == 1 || new_off == 11 || new_off == 12 || new_off == 13) goto ok;
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hpfs_lock_inode(i);
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pos = ((loff_t) hpfs_de_as_down_as_possible(s, i->i_hpfs_dno) << 4) + 1;
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while (pos != new_off) {
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if (map_pos_dirent(i, &pos, &qbh)) hpfs_brelse4(&qbh);
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else goto fail;
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if (pos == 12) goto fail;
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}
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hpfs_unlock_inode(i);
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ok:
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return filp->f_pos = new_off;
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fail:
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hpfs_unlock_inode(i);
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/*printk("illegal lseek: %016llx\n", new_off);*/
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return -ESPIPE;
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}
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int hpfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
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{
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struct inode *inode = filp->f_dentry->d_inode;
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struct quad_buffer_head qbh;
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struct hpfs_dirent *de;
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int lc;
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long old_pos;
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char *tempname;
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int c1, c2 = 0;
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if (inode->i_sb->s_hpfs_chk) {
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if (hpfs_chk_sectors(inode->i_sb, inode->i_ino, 1, "dir_fnode"))
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return -EFSERROR;
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if (hpfs_chk_sectors(inode->i_sb, inode->i_hpfs_dno, 4, "dir_dnode"))
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return -EFSERROR;
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}
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if (inode->i_sb->s_hpfs_chk >= 2) {
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struct buffer_head *bh;
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struct fnode *fno;
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int e = 0;
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if (!(fno = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh)))
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return -EIOERROR;
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if (!fno->dirflag) {
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e = 1;
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hpfs_error(inode->i_sb, "not a directory, fnode %08x",inode->i_ino);
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}
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if (inode->i_hpfs_dno != fno->u.external[0].disk_secno) {
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e = 1;
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hpfs_error(inode->i_sb, "corrupted inode: i_hpfs_dno == %08x, fnode -> dnode == %08x", inode->i_hpfs_dno, fno->u.external[0].disk_secno);
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}
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brelse(bh);
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if (e) return -EFSERROR;
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}
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lc = inode->i_sb->s_hpfs_lowercase;
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if (filp->f_pos == 12) { /* diff -r requires this (note, that diff -r */
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filp->f_pos = 13; /* also fails on msdos filesystem in 2.0) */
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return 0;
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}
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if (filp->f_pos == 13) return -ENOENT;
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hpfs_lock_inode(inode);
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while (1) {
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again:
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/* This won't work when cycle is longer than number of dirents
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accepted by filldir, but what can I do?
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maybe killall -9 ls helps */
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if (inode->i_sb->s_hpfs_chk)
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if (hpfs_stop_cycles(inode->i_sb, filp->f_pos, &c1, &c2, "hpfs_readdir")) {
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hpfs_unlock_inode(inode);
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return -EFSERROR;
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}
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if (filp->f_pos == 12) {
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hpfs_unlock_inode(inode);
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return 0;
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}
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if (filp->f_pos == 3 || filp->f_pos == 4 || filp->f_pos == 5) {
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printk("HPFS: warning: pos==%d\n",(int)filp->f_pos);
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hpfs_unlock_inode(inode);
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return 0;
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}
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if (filp->f_pos == 0) {
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if (filldir(dirent, ".", 1, filp->f_pos, inode->i_ino, DT_DIR) < 0) {
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hpfs_unlock_inode(inode);
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return 0;
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}
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filp->f_pos = 11;
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}
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if (filp->f_pos == 11) {
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if (filldir(dirent, "..", 2, filp->f_pos, inode->i_hpfs_parent_dir, DT_DIR) < 0) {
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hpfs_unlock_inode(inode);
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return 0;
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}
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filp->f_pos = 1;
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}
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if (filp->f_pos == 1) {
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filp->f_pos = ((loff_t) hpfs_de_as_down_as_possible(inode->i_sb, inode->i_hpfs_dno) << 4) + 1;
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hpfs_add_pos(inode, &filp->f_pos);
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filp->f_version = inode->i_version;
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}
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/*if (filp->f_version != inode->i_version) {
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hpfs_unlock_inode(inode);
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return -ENOENT;
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}*/
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old_pos = filp->f_pos;
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if (!(de = map_pos_dirent(inode, &filp->f_pos, &qbh))) {
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hpfs_unlock_inode(inode);
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return -EIOERROR;
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}
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if (de->first || de->last) {
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if (inode->i_sb->s_hpfs_chk) {
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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);
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if (de->last && (de->namelen != 1 || de ->name[0] != 255)) hpfs_error(inode->i_sb, "hpfs_readdir: bad \\377 entry; pos = %08x", old_pos);
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}
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hpfs_brelse4(&qbh);
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goto again;
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}
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tempname = hpfs_translate_name(inode->i_sb, de->name, de->namelen, lc, de->not_8x3);
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if (filldir(dirent, tempname, de->namelen, old_pos, de->fnode, DT_UNKNOWN) < 0) {
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filp->f_pos = old_pos;
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if (tempname != (char *)de->name) kfree(tempname);
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hpfs_brelse4(&qbh);
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hpfs_unlock_inode(inode);
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return 0;
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}
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if (tempname != (char *)de->name) kfree(tempname);
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hpfs_brelse4(&qbh);
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}
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}
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/*
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* lookup. Search the specified directory for the specified name, set
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* *result to the corresponding inode.
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*
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* lookup uses the inode number to tell read_inode whether it is reading
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* the inode of a directory or a file -- file ino's are odd, directory
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* ino's are even. read_inode avoids i/o for file inodes; everything
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* needed is up here in the directory. (And file fnodes are out in
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* the boondocks.)
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*
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* - M.P.: this is over, sometimes we've got to read file's fnode for eas
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* inode numbers are just fnode sector numbers; iget lock is used
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* to tell read_inode to read fnode or not.
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*/
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struct dentry *hpfs_lookup(struct inode *dir, struct dentry *dentry)
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{
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const char *name = dentry->d_name.name;
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unsigned len = dentry->d_name.len;
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struct quad_buffer_head qbh;
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struct hpfs_dirent *de;
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ino_t ino;
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int err;
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struct inode *result = NULL;
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| 184 |
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if ((err = hpfs_chk_name((char *)name, &len))) {
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if (err == -ENAMETOOLONG) return ERR_PTR(-ENAMETOOLONG);
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| 186 |
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goto end_add;
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| 187 |
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}
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| 188 |
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| 189 |
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hpfs_lock_inode(dir);
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| 190 |
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/*
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* '.' and '..' will never be passed here.
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| 192 |
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*/
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| 193 |
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| 194 |
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de = map_dirent(dir, dir->i_hpfs_dno, (char *) name, len, NULL, &qbh);
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/*
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* This is not really a bailout, just means file not found.
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*/
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if (!de) goto end;
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/*
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* Get inode number, what we're after.
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*/
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ino = de->fnode;
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| 208 |
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/*
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* Go find or make an inode.
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*/
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| 212 |
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hpfs_lock_iget(dir->i_sb, de->directory || (de->ea_size && dir->i_sb->s_hpfs_eas) ? 1 : 2);
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if (!(result = iget(dir->i_sb, ino))) {
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hpfs_unlock_iget(dir->i_sb);
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| 215 |
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hpfs_error(dir->i_sb, "hpfs_lookup: can't get inode");
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| 216 |
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goto bail1;
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| 217 |
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}
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| 218 |
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if (!de->directory) result->i_hpfs_parent_dir = dir->i_ino;
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| 219 |
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hpfs_unlock_iget(dir->i_sb);
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| 221 |
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hpfs_decide_conv(result, (char *)name, len);
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| 222 |
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| 223 |
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if (de->has_acl || de->has_xtd_perm) if (!(dir->i_sb->s_flags & MS_RDONLY)) {
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| 224 |
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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");
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| 225 |
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goto bail1;
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| 226 |
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}
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| 227 |
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| 228 |
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/*
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* Fill in the info from the directory if this is a newly created
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| 230 |
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* inode.
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| 231 |
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*/
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| 232 |
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| 233 |
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if (!result->i_ctime) {
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| 234 |
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if (!(result->i_ctime = local_to_gmt(dir->i_sb, de->creation_date)))
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| 235 |
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result->i_ctime = 1;
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| 236 |
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result->i_mtime = local_to_gmt(dir->i_sb, de->write_date);
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| 237 |
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result->i_atime = local_to_gmt(dir->i_sb, de->read_date);
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| 238 |
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result->i_hpfs_ea_size = de->ea_size;
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| 239 |
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if (!result->i_hpfs_ea_mode && de->read_only)
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| 240 |
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result->i_mode &= ~0222;
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| 241 |
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if (!de->directory) {
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| 242 |
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if (result->i_size == -1) {
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| 243 |
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result->i_size = de->file_size;
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| 244 |
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result->i_data.a_ops = &hpfs_aops;
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| 245 |
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result->u.hpfs_i.mmu_private = result->i_size;
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| 246 |
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/*
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| 247 |
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* i_blocks should count the fnode and any anodes.
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| 248 |
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* We count 1 for the fnode and don't bother about
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| 249 |
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* anodes -- the disk heads are on the directory band
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| 250 |
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* and we want them to stay there.
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| 251 |
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*/
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| 252 |
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result->i_blocks = 1 + ((result->i_size + 511) >> 9);
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| 253 |
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}
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| 254 |
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}
|
| 255 |
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}
|
| 256 |
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|
| 257 |
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hpfs_brelse4(&qbh);
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| 258 |
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|
| 259 |
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/*
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| 260 |
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* Made it.
|
| 261 |
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*/
|
| 262 |
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| 263 |
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end:
|
| 264 |
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hpfs_unlock_inode(dir);
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| 265 |
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end_add:
|
| 266 |
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hpfs_set_dentry_operations(dentry);
|
| 267 |
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d_add(dentry, result);
|
| 268 |
|
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return NULL;
|
| 269 |
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|
|
| 270 |
|
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/*
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| 271 |
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* Didn't.
|
| 272 |
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*/
|
| 273 |
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bail1:
|
| 274 |
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|
| 275 |
|
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hpfs_brelse4(&qbh);
|
| 276 |
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|
| 277 |
|
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/*bail:*/
|
| 278 |
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|
| 279 |
|
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hpfs_unlock_inode(dir);
|
| 280 |
|
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return ERR_PTR(-ENOENT);
|
| 281 |
|
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}
|
