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-rw-r--r--fs/hpfs/dir.c329
1 files changed, 329 insertions, 0 deletions
diff --git a/fs/hpfs/dir.c b/fs/hpfs/dir.c
new file mode 100644
index 0000000000..f36566d612
--- /dev/null
+++ b/fs/hpfs/dir.c
@@ -0,0 +1,329 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/fs/hpfs/dir.c
+ *
+ * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
+ *
+ * directory VFS functions
+ */
+
+#include <linux/slab.h>
+#include "hpfs_fn.h"
+
+static int hpfs_dir_release(struct inode *inode, struct file *filp)
+{
+ hpfs_lock(inode->i_sb);
+ hpfs_del_pos(inode, &filp->f_pos);
+ /*hpfs_write_if_changed(inode);*/
+ hpfs_unlock(inode->i_sb);
+ 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 = file_inode(filp);
+ struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
+ struct super_block *s = i->i_sb;
+
+ /* Somebody else will have to figure out what to do here */
+ if (whence == SEEK_DATA || whence == SEEK_HOLE)
+ return -EINVAL;
+
+ inode_lock(i);
+ hpfs_lock(s);
+
+ /*pr_info("dir lseek\n");*/
+ if (new_off == 0 || new_off == 1 || new_off == 11 || new_off == 12 || new_off == 13) goto ok;
+ 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;
+ }
+ if (unlikely(hpfs_add_pos(i, &filp->f_pos) < 0)) {
+ hpfs_unlock(s);
+ inode_unlock(i);
+ return -ENOMEM;
+ }
+ok:
+ filp->f_pos = new_off;
+ hpfs_unlock(s);
+ inode_unlock(i);
+ return new_off;
+fail:
+ /*pr_warn("illegal lseek: %016llx\n", new_off);*/
+ hpfs_unlock(s);
+ inode_unlock(i);
+ return -ESPIPE;
+}
+
+static int hpfs_readdir(struct file *file, struct dir_context *ctx)
+{
+ struct inode *inode = file_inode(file);
+ struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
+ struct quad_buffer_head qbh;
+ struct hpfs_dirent *de;
+ int lc;
+ loff_t next_pos;
+ unsigned char *tempname;
+ int c1, c2 = 0;
+ int ret = 0;
+
+ hpfs_lock(inode->i_sb);
+
+ 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 (!fnode_is_dir(fno)) {
+ e = 1;
+ hpfs_error(inode->i_sb, "not a directory, fnode %08lx",
+ (unsigned long)inode->i_ino);
+ }
+ if (hpfs_inode->i_dno != le32_to_cpu(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, le32_to_cpu(fno->u.external[0].disk_secno));
+ }
+ brelse(bh);
+ if (e) {
+ ret = -EFSERROR;
+ goto out;
+ }
+ }
+ lc = hpfs_sb(inode->i_sb)->sb_lowercase;
+ if (ctx->pos == 12) { /* diff -r requires this (note, that diff -r */
+ ctx->pos = 13; /* also fails on msdos filesystem in 2.0) */
+ goto out;
+ }
+ if (ctx->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, ctx->pos, &c1, &c2, "hpfs_readdir")) {
+ ret = -EFSERROR;
+ goto out;
+ }
+ if (ctx->pos == 12)
+ goto out;
+ if (ctx->pos == 3 || ctx->pos == 4 || ctx->pos == 5) {
+ pr_err("pos==%d\n", (int)ctx->pos);
+ goto out;
+ }
+ if (ctx->pos == 0) {
+ if (!dir_emit_dot(file, ctx))
+ goto out;
+ ctx->pos = 11;
+ }
+ if (ctx->pos == 11) {
+ if (!dir_emit(ctx, "..", 2, hpfs_inode->i_parent_dir, DT_DIR))
+ goto out;
+ ctx->pos = 1;
+ }
+ if (ctx->pos == 1) {
+ ret = hpfs_add_pos(inode, &file->f_pos);
+ if (unlikely(ret < 0))
+ goto out;
+ ctx->pos = ((loff_t) hpfs_de_as_down_as_possible(inode->i_sb, hpfs_inode->i_dno) << 4) + 1;
+ }
+ next_pos = ctx->pos;
+ if (!(de = map_pos_dirent(inode, &next_pos, &qbh))) {
+ ctx->pos = next_pos;
+ 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 = %08lx", (unsigned long)ctx->pos);
+ if (de->last && (de->namelen != 1 || de ->name[0] != 255))
+ hpfs_error(inode->i_sb, "hpfs_readdir: bad \\377 entry; pos = %08lx", (unsigned long)ctx->pos);
+ }
+ hpfs_brelse4(&qbh);
+ ctx->pos = next_pos;
+ goto again;
+ }
+ tempname = hpfs_translate_name(inode->i_sb, de->name, de->namelen, lc, de->not_8x3);
+ if (!dir_emit(ctx, tempname, de->namelen, le32_to_cpu(de->fnode), DT_UNKNOWN)) {
+ if (tempname != de->name) kfree(tempname);
+ hpfs_brelse4(&qbh);
+ goto out;
+ }
+ ctx->pos = next_pos;
+ if (tempname != de->name) kfree(tempname);
+ hpfs_brelse4(&qbh);
+ }
+out:
+ hpfs_unlock(inode->i_sb);
+ 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, unsigned int flags)
+{
+ const unsigned 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;
+
+ hpfs_lock(dir->i_sb);
+ if ((err = hpfs_chk_name(name, &len))) {
+ if (err == -ENAMETOOLONG) {
+ hpfs_unlock(dir->i_sb);
+ return ERR_PTR(-ENAMETOOLONG);
+ }
+ goto end_add;
+ }
+
+ /*
+ * '.' and '..' will never be passed here.
+ */
+
+ de = map_dirent(dir, hpfs_i(dir)->i_dno, 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 = le32_to_cpu(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");
+ result = ERR_PTR(-ENOMEM);
+ goto bail1;
+ }
+ if (result->i_state & I_NEW) {
+ hpfs_init_inode(result);
+ if (de->directory)
+ hpfs_read_inode(result);
+ else if (le32_to_cpu(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;
+ set_nlink(result, 1);
+ }
+ unlock_new_inode(result);
+ }
+ hpfs_result = hpfs_i(result);
+ if (!de->directory) hpfs_result->i_parent_dir = dir->i_ino;
+
+ if (de->has_acl || de->has_xtd_perm) if (!sb_rdonly(dir->i_sb)) {
+ 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");
+ iput(result);
+ result = ERR_PTR(-EINVAL);
+ goto bail1;
+ }
+
+ /*
+ * Fill in the info from the directory if this is a newly created
+ * inode.
+ */
+
+ if (!inode_get_ctime(result).tv_sec) {
+ time64_t csec = local_to_gmt(dir->i_sb, le32_to_cpu(de->creation_date));
+
+ inode_set_ctime(result, csec ? csec : 1, 0);
+ result->i_mtime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->write_date));
+ result->i_mtime.tv_nsec = 0;
+ result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->read_date));
+ result->i_atime.tv_nsec = 0;
+ hpfs_result->i_ea_size = le32_to_cpu(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 = le32_to_cpu(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);
+ }
+ }
+ }
+
+bail1:
+ hpfs_brelse4(&qbh);
+
+ /*
+ * Made it.
+ */
+
+end:
+end_add:
+ hpfs_unlock(dir->i_sb);
+ return d_splice_alias(result, dentry);
+}
+
+const struct file_operations hpfs_dir_ops =
+{
+ .llseek = hpfs_dir_lseek,
+ .read = generic_read_dir,
+ .iterate_shared = hpfs_readdir,
+ .release = hpfs_dir_release,
+ .fsync = hpfs_file_fsync,
+ .unlocked_ioctl = hpfs_ioctl,
+ .compat_ioctl = compat_ptr_ioctl,
+};
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-11 23:58:09 +0000