Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *	fs/bfs/dir.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *	BFS directory operations.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *	Copyright (C) 1999-2018  Tigran Aivazian <aivazian.tigran@gmail.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *  Made endianness-clean by Andrew Stribblehill <ads@wompom.org> 2005
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/time.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/buffer_head.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include "bfs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #undef DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #ifdef DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #define dprintf(x...)	printf(x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #define dprintf(x...)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) static int bfs_add_entry(struct inode *dir, const struct qstr *child, int ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) static struct buffer_head *bfs_find_entry(struct inode *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 				const struct qstr *child,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 				struct bfs_dirent **res_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) static int bfs_readdir(struct file *f, struct dir_context *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	struct inode *dir = file_inode(f);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	struct bfs_dirent *de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	unsigned int offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	int block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	if (ctx->pos & (BFS_DIRENT_SIZE - 1)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 		printf("Bad f_pos=%08lx for %s:%08lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 					(unsigned long)ctx->pos,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 					dir->i_sb->s_id, dir->i_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	while (ctx->pos < dir->i_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 		offset = ctx->pos & (BFS_BSIZE - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 		block = BFS_I(dir)->i_sblock + (ctx->pos >> BFS_BSIZE_BITS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 		bh = sb_bread(dir->i_sb, block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 		if (!bh) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 			ctx->pos += BFS_BSIZE - offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 		do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 			de = (struct bfs_dirent *)(bh->b_data + offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 			if (de->ino) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 				int size = strnlen(de->name, BFS_NAMELEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 				if (!dir_emit(ctx, de->name, size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 						le16_to_cpu(de->ino),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 						DT_UNKNOWN)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 					brelse(bh);
^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) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 			offset += BFS_DIRENT_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 			ctx->pos += BFS_DIRENT_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		} while ((offset < BFS_BSIZE) && (ctx->pos < dir->i_size));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 		brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) const struct file_operations bfs_dir_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	.read		= generic_read_dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	.iterate_shared	= bfs_readdir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	.fsync		= generic_file_fsync,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	.llseek		= generic_file_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) static int bfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 						bool excl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	struct super_block *s = dir->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	struct bfs_sb_info *info = BFS_SB(s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	unsigned long ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	inode = new_inode(s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	if (!inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	mutex_lock(&info->bfs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	ino = find_first_zero_bit(info->si_imap, info->si_lasti + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	if (ino > info->si_lasti) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		mutex_unlock(&info->bfs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 		iput(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 		return -ENOSPC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	set_bit(ino, info->si_imap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	info->si_freei--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	inode_init_owner(inode, dir, mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	inode->i_blocks = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	inode->i_op = &bfs_file_inops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	inode->i_fop = &bfs_file_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	inode->i_mapping->a_ops = &bfs_aops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	inode->i_ino = ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	BFS_I(inode)->i_dsk_ino = ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	BFS_I(inode)->i_sblock = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	BFS_I(inode)->i_eblock = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	insert_inode_hash(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)         mark_inode_dirty(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	bfs_dump_imap("create", s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	err = bfs_add_entry(dir, &dentry->d_name, inode->i_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		inode_dec_link_count(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		mutex_unlock(&info->bfs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		iput(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	mutex_unlock(&info->bfs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	d_instantiate(dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) static struct dentry *bfs_lookup(struct inode *dir, struct dentry *dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 						unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	struct inode *inode = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	struct bfs_dirent *de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	struct bfs_sb_info *info = BFS_SB(dir->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	if (dentry->d_name.len > BFS_NAMELEN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		return ERR_PTR(-ENAMETOOLONG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	mutex_lock(&info->bfs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	bh = bfs_find_entry(dir, &dentry->d_name, &de);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	if (bh) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		unsigned long ino = (unsigned long)le16_to_cpu(de->ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 		brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 		inode = bfs_iget(dir->i_sb, ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	mutex_unlock(&info->bfs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	return d_splice_alias(inode, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) static int bfs_link(struct dentry *old, struct inode *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 						struct dentry *new)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	struct inode *inode = d_inode(old);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	struct bfs_sb_info *info = BFS_SB(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	mutex_lock(&info->bfs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	err = bfs_add_entry(dir, &new->d_name, inode->i_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		mutex_unlock(&info->bfs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	inc_nlink(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	inode->i_ctime = current_time(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	mark_inode_dirty(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	ihold(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	d_instantiate(new, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	mutex_unlock(&info->bfs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) static int bfs_unlink(struct inode *dir, struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	int error = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	struct inode *inode = d_inode(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	struct bfs_dirent *de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	struct bfs_sb_info *info = BFS_SB(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	mutex_lock(&info->bfs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	bh = bfs_find_entry(dir, &dentry->d_name, &de);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	if (!bh || (le16_to_cpu(de->ino) != inode->i_ino))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		goto out_brelse;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	if (!inode->i_nlink) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		printf("unlinking non-existent file %s:%lu (nlink=%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 					inode->i_sb->s_id, inode->i_ino,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 					inode->i_nlink);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		set_nlink(inode, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	de->ino = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	mark_buffer_dirty_inode(bh, dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	dir->i_ctime = dir->i_mtime = current_time(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	mark_inode_dirty(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	inode->i_ctime = dir->i_ctime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	inode_dec_link_count(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	error = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) out_brelse:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	mutex_unlock(&info->bfs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) static int bfs_rename(struct inode *old_dir, struct dentry *old_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 		      struct inode *new_dir, struct dentry *new_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		      unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	struct inode *old_inode, *new_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	struct buffer_head *old_bh, *new_bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	struct bfs_dirent *old_de, *new_de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	struct bfs_sb_info *info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	int error = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	if (flags & ~RENAME_NOREPLACE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	old_bh = new_bh = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	old_inode = d_inode(old_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	if (S_ISDIR(old_inode->i_mode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	info = BFS_SB(old_inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	mutex_lock(&info->bfs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	old_bh = bfs_find_entry(old_dir, &old_dentry->d_name, &old_de);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	if (!old_bh || (le16_to_cpu(old_de->ino) != old_inode->i_ino))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		goto end_rename;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	error = -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	new_inode = d_inode(new_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	new_bh = bfs_find_entry(new_dir, &new_dentry->d_name, &new_de);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	if (new_bh && !new_inode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		brelse(new_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		new_bh = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	if (!new_bh) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		error = bfs_add_entry(new_dir, &new_dentry->d_name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 					old_inode->i_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 			goto end_rename;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	old_de->ino = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	mark_inode_dirty(old_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	if (new_inode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 		new_inode->i_ctime = current_time(new_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		inode_dec_link_count(new_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	mark_buffer_dirty_inode(old_bh, old_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	error = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) end_rename:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	mutex_unlock(&info->bfs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	brelse(old_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	brelse(new_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) const struct inode_operations bfs_dir_inops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	.create			= bfs_create,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	.lookup			= bfs_lookup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	.link			= bfs_link,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	.unlink			= bfs_unlink,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	.rename			= bfs_rename,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) static int bfs_add_entry(struct inode *dir, const struct qstr *child, int ino)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	const unsigned char *name = child->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	int namelen = child->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	struct bfs_dirent *de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	int block, sblock, eblock, off, pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	dprintf("name=%s, namelen=%d\n", name, namelen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	if (!namelen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 		return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	if (namelen > BFS_NAMELEN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 		return -ENAMETOOLONG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	sblock = BFS_I(dir)->i_sblock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	eblock = BFS_I(dir)->i_eblock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	for (block = sblock; block <= eblock; block++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 		bh = sb_bread(dir->i_sb, block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 		if (!bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 			return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 		for (off = 0; off < BFS_BSIZE; off += BFS_DIRENT_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 			de = (struct bfs_dirent *)(bh->b_data + off);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 			if (!de->ino) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 				pos = (block - sblock) * BFS_BSIZE + off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 				if (pos >= dir->i_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 					dir->i_size += BFS_DIRENT_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 					dir->i_ctime = current_time(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 				}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 				dir->i_mtime = current_time(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 				mark_inode_dirty(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 				de->ino = cpu_to_le16((u16)ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 				for (i = 0; i < BFS_NAMELEN; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 					de->name[i] =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 						(i < namelen) ? name[i] : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 				mark_buffer_dirty_inode(bh, dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 				brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 				return 0;
^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) 		brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	return -ENOSPC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) static inline int bfs_namecmp(int len, const unsigned char *name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 							const char *buffer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	if ((len < BFS_NAMELEN) && buffer[len])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	return !memcmp(name, buffer, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) static struct buffer_head *bfs_find_entry(struct inode *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 			const struct qstr *child,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 			struct bfs_dirent **res_dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	unsigned long block = 0, offset = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	struct buffer_head *bh = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	struct bfs_dirent *de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	const unsigned char *name = child->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	int namelen = child->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	*res_dir = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	if (namelen > BFS_NAMELEN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	while (block * BFS_BSIZE + offset < dir->i_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 		if (!bh) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 			bh = sb_bread(dir->i_sb, BFS_I(dir)->i_sblock + block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 			if (!bh) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 				block++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 				continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 		de = (struct bfs_dirent *)(bh->b_data + offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 		offset += BFS_DIRENT_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 		if (le16_to_cpu(de->ino) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 				bfs_namecmp(namelen, name, de->name)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 			*res_dir = de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 			return bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 		if (offset < bh->b_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 		brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 		bh = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 		offset = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 		block++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 	brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) }