Merge branch 'master' of git://git.denx.de/u-boot-i2c
[platform/kernel/u-boot.git] / fs / ext4 / ext4fs.c
1 /*
2  * (C) Copyright 2011 - 2012 Samsung Electronics
3  * EXT4 filesystem implementation in Uboot by
4  * Uma Shankar <uma.shankar@samsung.com>
5  * Manjunatha C Achar <a.manjunatha@samsung.com>
6  *
7  * ext4ls and ext4load : Based on ext2 ls and load support in Uboot.
8  *                     Ext4 read optimization taken from Open-Moko
9  *                     Qi bootloader
10  *
11  * (C) Copyright 2004
12  * esd gmbh <www.esd-electronics.com>
13  * Reinhard Arlt <reinhard.arlt@esd-electronics.com>
14  *
15  * based on code from grub2 fs/ext2.c and fs/fshelp.c by
16  * GRUB  --  GRand Unified Bootloader
17  * Copyright (C) 2003, 2004  Free Software Foundation, Inc.
18  *
19  * ext4write : Based on generic ext4 protocol.
20  *
21  * SPDX-License-Identifier:     GPL-2.0+
22  */
23
24 #include <common.h>
25 #include <ext_common.h>
26 #include <ext4fs.h>
27 #include "ext4_common.h"
28
29 int ext4fs_symlinknest;
30 struct ext_filesystem ext_fs;
31
32 struct ext_filesystem *get_fs(void)
33 {
34         return &ext_fs;
35 }
36
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  */
48 int ext4fs_read_file(struct ext2fs_node *node, int pos,
49                 unsigned int len, char *buf)
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         /* Adjust len so it we can't read past the end of the file. */
67         if (len > filesize)
68                 len = filesize;
69
70         blockcnt = ((len + pos) + blocksize - 1) / blocksize;
71
72         for (i = pos / blocksize; i < blockcnt; i++) {
73                 lbaint_t blknr;
74                 int blockoff = pos % blocksize;
75                 int blockend = blocksize;
76                 int skipfirst = 0;
77                 blknr = read_allocated_block(&(node->inode), i);
78                 if (blknr < 0)
79                         return -1;
80
81                 blknr = blknr << log2_fs_blocksize;
82
83                 /* Last block.  */
84                 if (i == blockcnt - 1) {
85                         blockend = (len + pos) % blocksize;
86
87                         /* The last portion is exactly blocksize. */
88                         if (!blockend)
89                                 blockend = blocksize;
90                 }
91
92                 /* First block. */
93                 if (i == pos / blocksize) {
94                         skipfirst = blockoff;
95                         blockend -= skipfirst;
96                 }
97                 if (blknr) {
98                         int status;
99
100                         if (previous_block_number != -1) {
101                                 if (delayed_next == blknr) {
102                                         delayed_extent += blockend;
103                                         delayed_next += blockend >> log2blksz;
104                                 } else {        /* spill */
105                                         status = ext4fs_devread(delayed_start,
106                                                         delayed_skipfirst,
107                                                         delayed_extent,
108                                                         delayed_buf);
109                                         if (status == 0)
110                                                 return -1;
111                                         previous_block_number = blknr;
112                                         delayed_start = blknr;
113                                         delayed_extent = blockend;
114                                         delayed_skipfirst = skipfirst;
115                                         delayed_buf = buf;
116                                         delayed_next = blknr +
117                                                 (blockend >> log2blksz);
118                                 }
119                         } else {
120                                 previous_block_number = blknr;
121                                 delayed_start = blknr;
122                                 delayed_extent = blockend;
123                                 delayed_skipfirst = skipfirst;
124                                 delayed_buf = buf;
125                                 delayed_next = blknr +
126                                         (blockend >> log2blksz);
127                         }
128                 } else {
129                         if (previous_block_number != -1) {
130                                 /* spill */
131                                 status = ext4fs_devread(delayed_start,
132                                                         delayed_skipfirst,
133                                                         delayed_extent,
134                                                         delayed_buf);
135                                 if (status == 0)
136                                         return -1;
137                                 previous_block_number = -1;
138                         }
139                         memset(buf, 0, blocksize - skipfirst);
140                 }
141                 buf += blocksize - skipfirst;
142         }
143         if (previous_block_number != -1) {
144                 /* spill */
145                 status = ext4fs_devread(delayed_start,
146                                         delayed_skipfirst, delayed_extent,
147                                         delayed_buf);
148                 if (status == 0)
149                         return -1;
150                 previous_block_number = -1;
151         }
152
153         return len;
154 }
155
156 int ext4fs_ls(const char *dirname)
157 {
158         struct ext2fs_node *dirnode;
159         int status;
160
161         if (dirname == NULL)
162                 return 0;
163
164         status = ext4fs_find_file(dirname, &ext4fs_root->diropen, &dirnode,
165                                   FILETYPE_DIRECTORY);
166         if (status != 1) {
167                 printf("** Can not find directory. **\n");
168                 return 1;
169         }
170
171         ext4fs_iterate_dir(dirnode, NULL, NULL, NULL);
172         ext4fs_free_node(dirnode, &ext4fs_root->diropen);
173
174         return 0;
175 }
176
177 int ext4fs_read(char *buf, unsigned len)
178 {
179         if (ext4fs_root == NULL || ext4fs_file == NULL)
180                 return 0;
181
182         return ext4fs_read_file(ext4fs_file, 0, len, buf);
183 }
184
185 int ext4fs_probe(block_dev_desc_t *fs_dev_desc,
186                  disk_partition_t *fs_partition)
187 {
188         ext4fs_set_blk_dev(fs_dev_desc, fs_partition);
189
190         if (!ext4fs_mount(fs_partition->size)) {
191                 ext4fs_close();
192                 return -1;
193         }
194
195         return 0;
196 }
197
198 int ext4_read_file(const char *filename, void *buf, int offset, int len)
199 {
200         int file_len;
201         int len_read;
202
203         if (offset != 0) {
204                 printf("** Cannot support non-zero offset **\n");
205                 return -1;
206         }
207
208         file_len = ext4fs_open(filename);
209         if (file_len < 0) {
210                 printf("** File not found %s **\n", filename);
211                 return -1;
212         }
213
214         if (len == 0)
215                 len = file_len;
216
217         len_read = ext4fs_read(buf, len);
218
219         return len_read;
220 }