From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- fs/hpfs/dir.c | 329 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 329 insertions(+) create mode 100644 fs/hpfs/dir.c (limited to 'fs/hpfs/dir.c') diff --git a/fs/hpfs/dir.c b/fs/hpfs/dir.c new file mode 100644 index 000000000..f32f15669 --- /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 +#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 (!result->i_ctime.tv_sec) { + if (!(result->i_ctime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(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, 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, +}; -- cgit v1.2.3