1 // SPDX-License-Identifier: GPL-2.0+
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>
8 * ext4ls and ext4load : Based on ext2 ls and load support in Uboot.
9 * Ext4 read optimization taken from Open-Moko
13 * esd gmbh <www.esd-electronics.com>
14 * Reinhard Arlt <reinhard.arlt@esd-electronics.com>
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.
20 * ext4write : Based on generic ext4 protocol.
24 #include <ext_common.h>
26 #include "ext4_common.h"
29 int ext4fs_symlinknest
;
30 struct ext_filesystem ext_fs
;
32 struct ext_filesystem
*get_fs(void)
37 void ext4fs_free_node(struct ext2fs_node
*node
, struct ext2fs_node
*currroot
)
39 if ((node
!= &ext4fs_root
->diropen
) && (node
!= currroot
))
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
48 int ext4fs_read_file(struct ext2fs_node
*node
, loff_t pos
,
49 loff_t len
, char *buf
, loff_t
*actread
)
51 struct ext_filesystem
*fs
= get_fs();
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
;
69 /* Adjust len so it we can't read past the end of the file. */
70 if (len
+ pos
> filesize
)
71 len
= (filesize
- pos
);
73 blockcnt
= lldiv(((len
+ pos
) + blocksize
- 1), blocksize
);
75 for (i
= lldiv(pos
, blocksize
); i
< blockcnt
; i
++) {
77 int blockoff
= pos
- (blocksize
* i
);
78 int blockend
= blocksize
;
80 blknr
= read_allocated_block(&(node
->inode
), i
);
84 blknr
= blknr
<< log2_fs_blocksize
;
87 if (i
== blockcnt
- 1) {
88 blockend
= (len
+ pos
) - (blocksize
* i
);
90 /* The last portion is exactly blocksize. */
96 if (i
== lldiv(pos
, blocksize
)) {
98 blockend
-= skipfirst
;
103 if (previous_block_number
!= -1) {
104 if (delayed_next
== blknr
) {
105 delayed_extent
+= blockend
;
106 delayed_next
+= blockend
>> log2blksz
;
108 status
= ext4fs_devread(delayed_start
,
114 previous_block_number
= blknr
;
115 delayed_start
= blknr
;
116 delayed_extent
= blockend
;
117 delayed_skipfirst
= skipfirst
;
119 delayed_next
= blknr
+
120 (blockend
>> log2blksz
);
123 previous_block_number
= blknr
;
124 delayed_start
= blknr
;
125 delayed_extent
= blockend
;
126 delayed_skipfirst
= skipfirst
;
128 delayed_next
= blknr
+
129 (blockend
>> log2blksz
);
133 if (previous_block_number
!= -1) {
135 status
= ext4fs_devread(delayed_start
,
141 previous_block_number
= -1;
143 /* Zero no more than `len' bytes. */
144 n
= blocksize
- skipfirst
;
149 buf
+= blocksize
- skipfirst
;
151 if (previous_block_number
!= -1) {
153 status
= ext4fs_devread(delayed_start
,
154 delayed_skipfirst
, delayed_extent
,
158 previous_block_number
= -1;
165 int ext4fs_ls(const char *dirname
)
167 struct ext2fs_node
*dirnode
= NULL
;
173 status
= ext4fs_find_file(dirname
, &ext4fs_root
->diropen
, &dirnode
,
176 printf("** Can not find directory. **\n");
178 ext4fs_free_node(dirnode
, &ext4fs_root
->diropen
);
182 ext4fs_iterate_dir(dirnode
, NULL
, NULL
, NULL
);
183 ext4fs_free_node(dirnode
, &ext4fs_root
->diropen
);
188 int ext4fs_exists(const char *filename
)
193 ret
= ext4fs_open(filename
, &file_len
);
197 int ext4fs_size(const char *filename
, loff_t
*size
)
199 return ext4fs_open(filename
, size
);
202 int ext4fs_read(char *buf
, loff_t offset
, loff_t len
, loff_t
*actread
)
204 if (ext4fs_root
== NULL
|| ext4fs_file
== NULL
)
207 return ext4fs_read_file(ext4fs_file
, offset
, len
, buf
, actread
);
210 int ext4fs_probe(struct blk_desc
*fs_dev_desc
,
211 disk_partition_t
*fs_partition
)
213 ext4fs_set_blk_dev(fs_dev_desc
, fs_partition
);
215 if (!ext4fs_mount(fs_partition
->size
)) {
223 int ext4_read_file(const char *filename
, void *buf
, loff_t offset
, loff_t len
,
229 ret
= ext4fs_open(filename
, &file_len
);
231 printf("** File not found %s **\n", filename
);
238 return ext4fs_read(buf
, offset
, len
, len_read
);
241 int ext4fs_uuid(char *uuid_str
)
243 if (ext4fs_root
== NULL
)
246 #ifdef CONFIG_LIB_UUID
247 uuid_bin_to_str((unsigned char *)ext4fs_root
->sblock
.unique_id
,
248 uuid_str
, UUID_STR_FORMAT_STD
);