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-rw-r--r--fs/hpfs/dir.c320
1 files changed, 320 insertions, 0 deletions
diff --git a/fs/hpfs/dir.c b/fs/hpfs/dir.c
new file mode 100644
index 00000000000..0217c3a0444
--- /dev/null
+++ b/fs/hpfs/dir.c
@@ -0,0 +1,320 @@
+/*
+ * linux/fs/hpfs/dir.c
+ *
+ * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
+ *
+ * directory VFS functions
+ */
+
+#include "hpfs_fn.h"
+
+static 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 */
+
+static 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 hpfs_inode_info *hpfs_inode = hpfs_i(i);
+ struct super_block *s = i->i_sb;
+
+ lock_kernel();
+
+ /*printk("dir lseek\n");*/
+ if (new_off == 0 || new_off == 1 || new_off == 11 || new_off == 12 || new_off == 13) goto ok;
+ down(&i->i_sem);
+ pos = ((loff_t) hpfs_de_as_down_as_possible(s, hpfs_inode->i_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;
+ }
+ up(&i->i_sem);
+ok:
+ unlock_kernel();
+ return filp->f_pos = new_off;
+fail:
+ up(&i->i_sem);
+ /*printk("illegal lseek: %016llx\n", new_off);*/
+ unlock_kernel();
+ return -ESPIPE;
+}
+
+static int hpfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
+{
+ struct inode *inode = filp->f_dentry->d_inode;
+ struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
+ struct quad_buffer_head qbh;
+ struct hpfs_dirent *de;
+ int lc;
+ long old_pos;
+ char *tempname;
+ int c1, c2 = 0;
+ int ret = 0;
+
+ lock_kernel();
+
+ if (hpfs_sb(inode->i_sb)->sb_chk) {
+ if (hpfs_chk_sectors(inode->i_sb, inode->i_ino, 1, "dir_fnode")) {
+ ret = -EFSERROR;
+ goto out;
+ }
+ if (hpfs_chk_sectors(inode->i_sb, hpfs_inode->i_dno, 4, "dir_dnode")) {
+ ret = -EFSERROR;
+ goto out;
+ }
+ }
+ if (hpfs_sb(inode->i_sb)->sb_chk >= 2) {
+ struct buffer_head *bh;
+ struct fnode *fno;
+ int e = 0;
+ if (!(fno = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) {
+ ret = -EIOERROR;
+ goto out;
+ }
+ if (!fno->dirflag) {
+ e = 1;
+ hpfs_error(inode->i_sb, "not a directory, fnode %08x",inode->i_ino);
+ }
+ if (hpfs_inode->i_dno != fno->u.external[0].disk_secno) {
+ e = 1;
+ hpfs_error(inode->i_sb, "corrupted inode: i_dno == %08x, fnode -> dnode == %08x", hpfs_inode->i_dno, fno->u.external[0].disk_secno);
+ }
+ brelse(bh);
+ if (e) {
+ ret = -EFSERROR;
+ goto out;
+ }
+ }
+ lc = hpfs_sb(inode->i_sb)->sb_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) */
+ goto out;
+ }
+ if (filp->f_pos == 13) {
+ ret = -ENOENT;
+ goto out;
+ }
+
+ 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 (hpfs_sb(inode->i_sb)->sb_chk)
+ if (hpfs_stop_cycles(inode->i_sb, filp->f_pos, &c1, &c2, "hpfs_readdir")) {
+ ret = -EFSERROR;
+ goto out;
+ }
+ if (filp->f_pos == 12)
+ goto out;
+ if (filp->f_pos == 3 || filp->f_pos == 4 || filp->f_pos == 5) {
+ printk("HPFS: warning: pos==%d\n",(int)filp->f_pos);
+ goto out;
+ }
+ if (filp->f_pos == 0) {
+ if (filldir(dirent, ".", 1, filp->f_pos, inode->i_ino, DT_DIR) < 0)
+ goto out;
+ filp->f_pos = 11;
+ }
+ if (filp->f_pos == 11) {
+ if (filldir(dirent, "..", 2, filp->f_pos, hpfs_inode->i_parent_dir, DT_DIR) < 0)
+ goto out;
+ filp->f_pos = 1;
+ }
+ if (filp->f_pos == 1) {
+ filp->f_pos = ((loff_t) hpfs_de_as_down_as_possible(inode->i_sb, hpfs_inode->i_dno) << 4) + 1;
+ hpfs_add_pos(inode, &filp->f_pos);
+ filp->f_version = inode->i_version;
+ }
+ old_pos = filp->f_pos;
+ if (!(de = map_pos_dirent(inode, &filp->f_pos, &qbh))) {
+ ret = -EIOERROR;
+ goto out;
+ }
+ if (de->first || de->last) {
+ if (hpfs_sb(inode->i_sb)->sb_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);
+ goto out;
+ }
+ if (tempname != (char *)de->name) kfree(tempname);
+ hpfs_brelse4(&qbh);
+ }
+out:
+ unlock_kernel();
+ return ret;
+}
+
+/*
+ * 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, struct nameidata *nd)
+{
+ 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;
+ struct hpfs_inode_info *hpfs_result;
+
+ lock_kernel();
+ if ((err = hpfs_chk_name((char *)name, &len))) {
+ if (err == -ENAMETOOLONG) {
+ unlock_kernel();
+ return ERR_PTR(-ENAMETOOLONG);
+ }
+ goto end_add;
+ }
+
+ /*
+ * '.' and '..' will never be passed here.
+ */
+
+ de = map_dirent(dir, hpfs_i(dir)->i_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.
+ */
+
+ result = iget_locked(dir->i_sb, ino);
+ if (!result) {
+ hpfs_error(dir->i_sb, "hpfs_lookup: can't get inode");
+ goto bail1;
+ }
+ if (result->i_state & I_NEW) {
+ hpfs_init_inode(result);
+ if (de->directory)
+ hpfs_read_inode(result);
+ else if (de->ea_size && hpfs_sb(dir->i_sb)->sb_eas)
+ hpfs_read_inode(result);
+ else {
+ result->i_mode |= S_IFREG;
+ result->i_mode &= ~0111;
+ result->i_op = &hpfs_file_iops;
+ result->i_fop = &hpfs_file_ops;
+ result->i_nlink = 1;
+ }
+ unlock_new_inode(result);
+ }
+ hpfs_result = hpfs_i(result);
+ if (!de->directory) hpfs_result->i_parent_dir = dir->i_ino;
+
+ 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.tv_sec) {
+ if (!(result->i_ctime.tv_sec = local_to_gmt(dir->i_sb, de->creation_date)))
+ result->i_ctime.tv_sec = 1;
+ result->i_ctime.tv_nsec = 0;
+ result->i_mtime.tv_sec = local_to_gmt(dir->i_sb, de->write_date);
+ result->i_mtime.tv_nsec = 0;
+ result->i_atime.tv_sec = local_to_gmt(dir->i_sb, de->read_date);
+ result->i_atime.tv_nsec = 0;
+ hpfs_result->i_ea_size = de->ea_size;
+ if (!hpfs_result->i_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;
+ hpfs_i(result)->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:
+ end_add:
+ hpfs_set_dentry_operations(dentry);
+ unlock_kernel();
+ d_add(dentry, result);
+ return NULL;
+
+ /*
+ * Didn't.
+ */
+ bail1:
+
+ hpfs_brelse4(&qbh);
+
+ /*bail:*/
+
+ unlock_kernel();
+ return ERR_PTR(-ENOENT);
+}
+
+struct file_operations hpfs_dir_ops =
+{
+ .llseek = hpfs_dir_lseek,
+ .read = generic_read_dir,
+ .readdir = hpfs_readdir,
+ .release = hpfs_dir_release,
+ .fsync = hpfs_file_fsync,
+};
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-25 05:23:02 +0000