xref: /openbmc/u-boot/fs/ext4/ext4fs.c (revision 3eceff64)
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * (C) Copyright 2011 - 2012 Samsung Electronics
4  * EXT4 filesystem implementation in Uboot by
5  * Uma Shankar <uma.shankar@samsung.com>
6  * Manjunatha C Achar <a.manjunatha@samsung.com>
7  *
8  * ext4ls and ext4load : Based on ext2 ls and load support in Uboot.
9  *		       Ext4 read optimization taken from Open-Moko
10  *		       Qi bootloader
11  *
12  * (C) Copyright 2004
13  * esd gmbh <www.esd-electronics.com>
14  * Reinhard Arlt <reinhard.arlt@esd-electronics.com>
15  *
16  * based on code from grub2 fs/ext2.c and fs/fshelp.c by
17  * GRUB  --  GRand Unified Bootloader
18  * Copyright (C) 2003, 2004  Free Software Foundation, Inc.
19  *
20  * ext4write : Based on generic ext4 protocol.
21  */
22 
23 #include <common.h>
24 #include <ext_common.h>
25 #include <ext4fs.h>
26 #include "ext4_common.h"
27 #include <div64.h>
28 
29 int ext4fs_symlinknest;
30 struct ext_filesystem ext_fs;
31 
get_fs(void)32 struct ext_filesystem *get_fs(void)
33 {
34 	return &ext_fs;
35 }
36 
ext4fs_free_node(struct ext2fs_node * node,struct ext2fs_node * currroot)37 void ext4fs_free_node(struct ext2fs_node *node, struct ext2fs_node *currroot)
38 {
39 	if ((node != &ext4fs_root->diropen) && (node != currroot))
40 		free(node);
41 }
42 
43 /*
44  * Taken from openmoko-kernel mailing list: By Andy green
45  * Optimized read file API : collects and defers contiguous sector
46  * reads into one potentially more efficient larger sequential read action
47  */
ext4fs_read_file(struct ext2fs_node * node,loff_t pos,loff_t len,char * buf,loff_t * actread)48 int ext4fs_read_file(struct ext2fs_node *node, loff_t pos,
49 		loff_t len, char *buf, loff_t *actread)
50 {
51 	struct ext_filesystem *fs = get_fs();
52 	int i;
53 	lbaint_t blockcnt;
54 	int log2blksz = fs->dev_desc->log2blksz;
55 	int log2_fs_blocksize = LOG2_BLOCK_SIZE(node->data) - log2blksz;
56 	int blocksize = (1 << (log2_fs_blocksize + log2blksz));
57 	unsigned int filesize = le32_to_cpu(node->inode.size);
58 	lbaint_t previous_block_number = -1;
59 	lbaint_t delayed_start = 0;
60 	lbaint_t delayed_extent = 0;
61 	lbaint_t delayed_skipfirst = 0;
62 	lbaint_t delayed_next = 0;
63 	char *delayed_buf = NULL;
64 	short status;
65 
66 	if (blocksize <= 0)
67 		return -1;
68 
69 	/* Adjust len so it we can't read past the end of the file. */
70 	if (len + pos > filesize)
71 		len = (filesize - pos);
72 
73 	blockcnt = lldiv(((len + pos) + blocksize - 1), blocksize);
74 
75 	for (i = lldiv(pos, blocksize); i < blockcnt; i++) {
76 		long int blknr;
77 		int blockoff = pos - (blocksize * i);
78 		int blockend = blocksize;
79 		int skipfirst = 0;
80 		blknr = read_allocated_block(&(node->inode), i);
81 		if (blknr < 0)
82 			return -1;
83 
84 		blknr = blknr << log2_fs_blocksize;
85 
86 		/* Last block.  */
87 		if (i == blockcnt - 1) {
88 			blockend = (len + pos) - (blocksize * i);
89 
90 			/* The last portion is exactly blocksize. */
91 			if (!blockend)
92 				blockend = blocksize;
93 		}
94 
95 		/* First block. */
96 		if (i == lldiv(pos, blocksize)) {
97 			skipfirst = blockoff;
98 			blockend -= skipfirst;
99 		}
100 		if (blknr) {
101 			int status;
102 
103 			if (previous_block_number != -1) {
104 				if (delayed_next == blknr) {
105 					delayed_extent += blockend;
106 					delayed_next += blockend >> log2blksz;
107 				} else {	/* spill */
108 					status = ext4fs_devread(delayed_start,
109 							delayed_skipfirst,
110 							delayed_extent,
111 							delayed_buf);
112 					if (status == 0)
113 						return -1;
114 					previous_block_number = blknr;
115 					delayed_start = blknr;
116 					delayed_extent = blockend;
117 					delayed_skipfirst = skipfirst;
118 					delayed_buf = buf;
119 					delayed_next = blknr +
120 						(blockend >> log2blksz);
121 				}
122 			} else {
123 				previous_block_number = blknr;
124 				delayed_start = blknr;
125 				delayed_extent = blockend;
126 				delayed_skipfirst = skipfirst;
127 				delayed_buf = buf;
128 				delayed_next = blknr +
129 					(blockend >> log2blksz);
130 			}
131 		} else {
132 			int n;
133 			if (previous_block_number != -1) {
134 				/* spill */
135 				status = ext4fs_devread(delayed_start,
136 							delayed_skipfirst,
137 							delayed_extent,
138 							delayed_buf);
139 				if (status == 0)
140 					return -1;
141 				previous_block_number = -1;
142 			}
143 			/* Zero no more than `len' bytes. */
144 			n = blocksize - skipfirst;
145 			if (n > len)
146 				n = len;
147 			memset(buf, 0, n);
148 		}
149 		buf += blocksize - skipfirst;
150 	}
151 	if (previous_block_number != -1) {
152 		/* spill */
153 		status = ext4fs_devread(delayed_start,
154 					delayed_skipfirst, delayed_extent,
155 					delayed_buf);
156 		if (status == 0)
157 			return -1;
158 		previous_block_number = -1;
159 	}
160 
161 	*actread  = len;
162 	return 0;
163 }
164 
ext4fs_ls(const char * dirname)165 int ext4fs_ls(const char *dirname)
166 {
167 	struct ext2fs_node *dirnode = NULL;
168 	int status;
169 
170 	if (dirname == NULL)
171 		return 0;
172 
173 	status = ext4fs_find_file(dirname, &ext4fs_root->diropen, &dirnode,
174 				  FILETYPE_DIRECTORY);
175 	if (status != 1) {
176 		printf("** Can not find directory. **\n");
177 		if (dirnode)
178 			ext4fs_free_node(dirnode, &ext4fs_root->diropen);
179 		return 1;
180 	}
181 
182 	ext4fs_iterate_dir(dirnode, NULL, NULL, NULL);
183 	ext4fs_free_node(dirnode, &ext4fs_root->diropen);
184 
185 	return 0;
186 }
187 
ext4fs_exists(const char * filename)188 int ext4fs_exists(const char *filename)
189 {
190 	loff_t file_len;
191 	int ret;
192 
193 	ret = ext4fs_open(filename, &file_len);
194 	return ret == 0;
195 }
196 
ext4fs_size(const char * filename,loff_t * size)197 int ext4fs_size(const char *filename, loff_t *size)
198 {
199 	return ext4fs_open(filename, size);
200 }
201 
ext4fs_read(char * buf,loff_t offset,loff_t len,loff_t * actread)202 int ext4fs_read(char *buf, loff_t offset, loff_t len, loff_t *actread)
203 {
204 	if (ext4fs_root == NULL || ext4fs_file == NULL)
205 		return -1;
206 
207 	return ext4fs_read_file(ext4fs_file, offset, len, buf, actread);
208 }
209 
ext4fs_probe(struct blk_desc * fs_dev_desc,disk_partition_t * fs_partition)210 int ext4fs_probe(struct blk_desc *fs_dev_desc,
211 		 disk_partition_t *fs_partition)
212 {
213 	ext4fs_set_blk_dev(fs_dev_desc, fs_partition);
214 
215 	if (!ext4fs_mount(fs_partition->size)) {
216 		ext4fs_close();
217 		return -1;
218 	}
219 
220 	return 0;
221 }
222 
ext4_read_file(const char * filename,void * buf,loff_t offset,loff_t len,loff_t * len_read)223 int ext4_read_file(const char *filename, void *buf, loff_t offset, loff_t len,
224 		   loff_t *len_read)
225 {
226 	loff_t file_len;
227 	int ret;
228 
229 	ret = ext4fs_open(filename, &file_len);
230 	if (ret < 0) {
231 		printf("** File not found %s **\n", filename);
232 		return -1;
233 	}
234 
235 	if (len == 0)
236 		len = file_len;
237 
238 	return ext4fs_read(buf, offset, len, len_read);
239 }
240 
ext4fs_uuid(char * uuid_str)241 int ext4fs_uuid(char *uuid_str)
242 {
243 	if (ext4fs_root == NULL)
244 		return -1;
245 
246 #ifdef CONFIG_LIB_UUID
247 	uuid_bin_to_str((unsigned char *)ext4fs_root->sblock.unique_id,
248 			uuid_str, UUID_STR_FORMAT_STD);
249 
250 	return 0;
251 #else
252 	return -ENOSYS;
253 #endif
254 }
255