Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2)  *  linux/fs/hfs/dir.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Copyright (C) 1995-1997  Paul H. Hargrove
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * (C) 2003 Ardis Technologies <roman@ardistech.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * This file may be distributed under the terms of the GNU General Public License.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  * This file contains directory-related functions independent of which
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  * scheme is being used to represent forks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  * Based on the minix file system code, (C) 1991, 1992 by Linus Torvalds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include "hfs_fs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include "btree.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18)  * hfs_lookup()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) static struct dentry *hfs_lookup(struct inode *dir, struct dentry *dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 				 unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	hfs_cat_rec rec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	struct hfs_find_data fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	struct inode *inode = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	int res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	res = hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	if (res)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 		return ERR_PTR(res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	hfs_cat_build_key(dir->i_sb, fd.search_key, dir->i_ino, &dentry->d_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	res = hfs_brec_read(&fd, &rec, sizeof(rec));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	if (res) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 		if (res != -ENOENT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 			inode = ERR_PTR(res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 		inode = hfs_iget(dir->i_sb, &fd.search_key->cat, &rec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 		if (!inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 			inode = ERR_PTR(-EACCES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	hfs_find_exit(&fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	return d_splice_alias(inode, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46)  * hfs_readdir
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) static int hfs_readdir(struct file *file, struct dir_context *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	struct inode *inode = file_inode(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	struct super_block *sb = inode->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	int len, err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	char strbuf[HFS_MAX_NAMELEN];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	union hfs_cat_rec entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	struct hfs_find_data fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	struct hfs_readdir_data *rd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	u16 type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	if (ctx->pos >= inode->i_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	err = hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	hfs_cat_build_key(sb, fd.search_key, inode->i_ino, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	err = hfs_brec_find(&fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	if (ctx->pos == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		/* This is completely artificial... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 		if (!dir_emit_dot(file, ctx))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		ctx->pos = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	if (ctx->pos == 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 			err = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, fd.entrylength);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		if (entry.type != HFS_CDR_THD) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 			pr_err("bad catalog folder thread\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 			err = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		//if (fd.entrylength < HFS_MIN_THREAD_SZ) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		//	pr_err("truncated catalog thread\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		//	err = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		//	goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 		//}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		if (!dir_emit(ctx, "..", 2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 			    be32_to_cpu(entry.thread.ParID), DT_DIR))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		ctx->pos = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	if (ctx->pos >= inode->i_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	err = hfs_brec_goto(&fd, ctx->pos - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	for (;;) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		if (be32_to_cpu(fd.key->cat.ParID) != inode->i_ino) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 			pr_err("walked past end of dir\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 			err = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 			err = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, fd.entrylength);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		type = entry.type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		len = hfs_mac2asc(sb, strbuf, &fd.key->cat.CName);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		if (type == HFS_CDR_DIR) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 			if (fd.entrylength < sizeof(struct hfs_cat_dir)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 				pr_err("small dir entry\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 				err = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 				goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 			if (!dir_emit(ctx, strbuf, len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 				    be32_to_cpu(entry.dir.DirID), DT_DIR))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 				break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		} else if (type == HFS_CDR_FIL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 			if (fd.entrylength < sizeof(struct hfs_cat_file)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 				pr_err("small file entry\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 				err = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 				goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 			if (!dir_emit(ctx, strbuf, len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 				    be32_to_cpu(entry.file.FlNum), DT_REG))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 				break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 			pr_err("bad catalog entry type %d\n", type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 			err = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 		ctx->pos++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		if (ctx->pos >= inode->i_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		err = hfs_brec_goto(&fd, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	rd = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	if (!rd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		rd = kmalloc(sizeof(struct hfs_readdir_data), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		if (!rd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 			err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		file->private_data = rd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		rd->file = file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		spin_lock(&HFS_I(inode)->open_dir_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		list_add(&rd->list, &HFS_I(inode)->open_dir_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		spin_unlock(&HFS_I(inode)->open_dir_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	 * Can be done after the list insertion; exclusion with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	 * hfs_delete_cat() is provided by directory lock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	memcpy(&rd->key, &fd.key->cat, sizeof(struct hfs_cat_key));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	hfs_find_exit(&fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) static int hfs_dir_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	struct hfs_readdir_data *rd = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	if (rd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		spin_lock(&HFS_I(inode)->open_dir_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		list_del(&rd->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		spin_unlock(&HFS_I(inode)->open_dir_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		kfree(rd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)  * hfs_create()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)  * This is the create() entry in the inode_operations structure for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)  * regular HFS directories.  The purpose is to create a new file in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)  * a directory and return a corresponding inode, given the inode for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)  * the directory and the name (and its length) of the new file.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) static int hfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 		      bool excl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	int res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	inode = hfs_new_inode(dir, &dentry->d_name, mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	if (!inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	res = hfs_cat_create(inode->i_ino, dir, &dentry->d_name, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	if (res) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		clear_nlink(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		hfs_delete_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		iput(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	d_instantiate(dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	mark_inode_dirty(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)  * hfs_mkdir()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)  * This is the mkdir() entry in the inode_operations structure for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218)  * regular HFS directories.  The purpose is to create a new directory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)  * in a directory, given the inode for the parent directory and the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)  * name (and its length) of the new directory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) static int hfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	int res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	inode = hfs_new_inode(dir, &dentry->d_name, S_IFDIR | mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	if (!inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	res = hfs_cat_create(inode->i_ino, dir, &dentry->d_name, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	if (res) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		clear_nlink(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		hfs_delete_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		iput(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	d_instantiate(dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	mark_inode_dirty(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)  * hfs_remove()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246)  * This serves as both unlink() and rmdir() in the inode_operations
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)  * structure for regular HFS directories.  The purpose is to delete
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)  * an existing child, given the inode for the parent directory and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)  * the name (and its length) of the existing directory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251)  * HFS does not have hardlinks, so both rmdir and unlink set the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252)  * link count to 0.  The only difference is the emptiness check.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) static int hfs_remove(struct inode *dir, struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	struct inode *inode = d_inode(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	int res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	if (S_ISDIR(inode->i_mode) && inode->i_size != 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 		return -ENOTEMPTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	res = hfs_cat_delete(inode->i_ino, dir, &dentry->d_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	if (res)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 		return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	clear_nlink(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	inode->i_ctime = current_time(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	hfs_delete_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	mark_inode_dirty(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)  * hfs_rename()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)  * This is the rename() entry in the inode_operations structure for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)  * regular HFS directories.  The purpose is to rename an existing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)  * file or directory, given the inode for the current directory and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)  * the name (and its length) of the existing file/directory and the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)  * inode for the new directory and the name (and its length) of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)  * new file/directory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280)  * XXX: how do you handle must_be dir?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) static int hfs_rename(struct inode *old_dir, struct dentry *old_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 		      struct inode *new_dir, struct dentry *new_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 		      unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	int res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	if (flags & ~RENAME_NOREPLACE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	/* Unlink destination if it already exists */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	if (d_really_is_positive(new_dentry)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 		res = hfs_remove(new_dir, new_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 		if (res)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 			return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	res = hfs_cat_move(d_inode(old_dentry)->i_ino,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 			   old_dir, &old_dentry->d_name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 			   new_dir, &new_dentry->d_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	if (!res)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 		hfs_cat_build_key(old_dir->i_sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 				  (btree_key *)&HFS_I(d_inode(old_dentry))->cat_key,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 				  new_dir->i_ino, &new_dentry->d_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) const struct file_operations hfs_dir_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	.read		= generic_read_dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	.iterate_shared	= hfs_readdir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	.llseek		= generic_file_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	.release	= hfs_dir_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) const struct inode_operations hfs_dir_inode_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	.create		= hfs_create,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	.lookup		= hfs_lookup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	.unlink		= hfs_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	.mkdir		= hfs_mkdir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	.rmdir		= hfs_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	.rename		= hfs_rename,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	.setattr	= hfs_inode_setattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) };