183d290c5STom Rini // SPDX-License-Identifier: GPL-2.0+
2a1596438SUma Shankar /*
3a1596438SUma Shankar * (C) Copyright 2011 - 2012 Samsung Electronics
4a1596438SUma Shankar * EXT4 filesystem implementation in Uboot by
5a1596438SUma Shankar * Uma Shankar <uma.shankar@samsung.com>
6a1596438SUma Shankar * Manjunatha C Achar <a.manjunatha@samsung.com>
7a1596438SUma Shankar *
8a1596438SUma Shankar * ext4ls and ext4load : Based on ext2 ls load support in Uboot.
9a1596438SUma Shankar *
10a1596438SUma Shankar * (C) Copyright 2004
11a1596438SUma Shankar * esd gmbh <www.esd-electronics.com>
12a1596438SUma Shankar * Reinhard Arlt <reinhard.arlt@esd-electronics.com>
13a1596438SUma Shankar *
14a1596438SUma Shankar * based on code from grub2 fs/ext2.c and fs/fshelp.c by
15a1596438SUma Shankar * GRUB -- GRand Unified Bootloader
16a1596438SUma Shankar * Copyright (C) 2003, 2004 Free Software Foundation, Inc.
17a1596438SUma Shankar *
18ed34f34dSUma Shankar * ext4write : Based on generic ext4 protocol.
19a1596438SUma Shankar */
20a1596438SUma Shankar
21a1596438SUma Shankar #include <common.h>
22a1596438SUma Shankar #include <ext_common.h>
23a1596438SUma Shankar #include <ext4fs.h>
24a1596438SUma Shankar #include <malloc.h>
25cf92e05cSSimon Glass #include <memalign.h>
26a1596438SUma Shankar #include <stddef.h>
27a1596438SUma Shankar #include <linux/stat.h>
28a1596438SUma Shankar #include <linux/time.h>
29a1596438SUma Shankar #include <asm/byteorder.h>
30a1596438SUma Shankar #include "ext4_common.h"
31a1596438SUma Shankar
32a1596438SUma Shankar struct ext2_data *ext4fs_root;
33a1596438SUma Shankar struct ext2fs_node *ext4fs_file;
3458a9ecbaSMichael Walle __le32 *ext4fs_indir1_block;
35a1596438SUma Shankar int ext4fs_indir1_size;
36a1596438SUma Shankar int ext4fs_indir1_blkno = -1;
3758a9ecbaSMichael Walle __le32 *ext4fs_indir2_block;
38a1596438SUma Shankar int ext4fs_indir2_size;
39a1596438SUma Shankar int ext4fs_indir2_blkno = -1;
40a1596438SUma Shankar
4158a9ecbaSMichael Walle __le32 *ext4fs_indir3_block;
42a1596438SUma Shankar int ext4fs_indir3_size;
43a1596438SUma Shankar int ext4fs_indir3_blkno = -1;
44a1596438SUma Shankar struct ext2_inode *g_parent_inode;
45a1596438SUma Shankar static int symlinknest;
46a1596438SUma Shankar
4703e2ecf6SStephen Warren #if defined(CONFIG_EXT4_WRITE)
ext4fs_get_group_descriptor(const struct ext_filesystem * fs,uint32_t bg_idx)489f5dd8b6SStefan Brüns struct ext2_block_group *ext4fs_get_group_descriptor
499f5dd8b6SStefan Brüns (const struct ext_filesystem *fs, uint32_t bg_idx)
509f5dd8b6SStefan Brüns {
519f5dd8b6SStefan Brüns return (struct ext2_block_group *)(fs->gdtable + (bg_idx * fs->gdsize));
529f5dd8b6SStefan Brüns }
539f5dd8b6SStefan Brüns
ext4fs_sb_free_inodes_dec(struct ext2_sblock * sb)5458a9ecbaSMichael Walle static inline void ext4fs_sb_free_inodes_dec(struct ext2_sblock *sb)
5558a9ecbaSMichael Walle {
5658a9ecbaSMichael Walle sb->free_inodes = cpu_to_le32(le32_to_cpu(sb->free_inodes) - 1);
5758a9ecbaSMichael Walle }
5858a9ecbaSMichael Walle
ext4fs_sb_free_blocks_dec(struct ext2_sblock * sb)5958a9ecbaSMichael Walle static inline void ext4fs_sb_free_blocks_dec(struct ext2_sblock *sb)
6058a9ecbaSMichael Walle {
61749e93eeSStefan Brüns uint64_t free_blocks = le32_to_cpu(sb->free_blocks);
62749e93eeSStefan Brüns free_blocks += (uint64_t)le32_to_cpu(sb->free_blocks_high) << 32;
63749e93eeSStefan Brüns free_blocks--;
64749e93eeSStefan Brüns
65749e93eeSStefan Brüns sb->free_blocks = cpu_to_le32(free_blocks & 0xffffffff);
66749e93eeSStefan Brüns sb->free_blocks_high = cpu_to_le16(free_blocks >> 32);
6758a9ecbaSMichael Walle }
6858a9ecbaSMichael Walle
ext4fs_bg_free_inodes_dec(struct ext2_block_group * bg,const struct ext_filesystem * fs)69749e93eeSStefan Brüns static inline void ext4fs_bg_free_inodes_dec
70749e93eeSStefan Brüns (struct ext2_block_group *bg, const struct ext_filesystem *fs)
7158a9ecbaSMichael Walle {
72749e93eeSStefan Brüns uint32_t free_inodes = le16_to_cpu(bg->free_inodes);
73749e93eeSStefan Brüns if (fs->gdsize == 64)
74749e93eeSStefan Brüns free_inodes += le16_to_cpu(bg->free_inodes_high) << 16;
75749e93eeSStefan Brüns free_inodes--;
76749e93eeSStefan Brüns
77749e93eeSStefan Brüns bg->free_inodes = cpu_to_le16(free_inodes & 0xffff);
78749e93eeSStefan Brüns if (fs->gdsize == 64)
79749e93eeSStefan Brüns bg->free_inodes_high = cpu_to_le16(free_inodes >> 16);
8058a9ecbaSMichael Walle }
8158a9ecbaSMichael Walle
ext4fs_bg_free_blocks_dec(struct ext2_block_group * bg,const struct ext_filesystem * fs)82749e93eeSStefan Brüns static inline void ext4fs_bg_free_blocks_dec
83749e93eeSStefan Brüns (struct ext2_block_group *bg, const struct ext_filesystem *fs)
8458a9ecbaSMichael Walle {
85749e93eeSStefan Brüns uint32_t free_blocks = le16_to_cpu(bg->free_blocks);
86749e93eeSStefan Brüns if (fs->gdsize == 64)
87749e93eeSStefan Brüns free_blocks += le16_to_cpu(bg->free_blocks_high) << 16;
88749e93eeSStefan Brüns free_blocks--;
89749e93eeSStefan Brüns
90749e93eeSStefan Brüns bg->free_blocks = cpu_to_le16(free_blocks & 0xffff);
91749e93eeSStefan Brüns if (fs->gdsize == 64)
92749e93eeSStefan Brüns bg->free_blocks_high = cpu_to_le16(free_blocks >> 16);
9358a9ecbaSMichael Walle }
9458a9ecbaSMichael Walle
ext4fs_bg_itable_unused_dec(struct ext2_block_group * bg,const struct ext_filesystem * fs)95749e93eeSStefan Brüns static inline void ext4fs_bg_itable_unused_dec
96749e93eeSStefan Brüns (struct ext2_block_group *bg, const struct ext_filesystem *fs)
9758a9ecbaSMichael Walle {
98749e93eeSStefan Brüns uint32_t free_inodes = le16_to_cpu(bg->bg_itable_unused);
99749e93eeSStefan Brüns if (fs->gdsize == 64)
100749e93eeSStefan Brüns free_inodes += le16_to_cpu(bg->bg_itable_unused_high) << 16;
101749e93eeSStefan Brüns free_inodes--;
102749e93eeSStefan Brüns
103749e93eeSStefan Brüns bg->bg_itable_unused = cpu_to_le16(free_inodes & 0xffff);
104749e93eeSStefan Brüns if (fs->gdsize == 64)
105749e93eeSStefan Brüns bg->bg_itable_unused_high = cpu_to_le16(free_inodes >> 16);
10658a9ecbaSMichael Walle }
10758a9ecbaSMichael Walle
ext4fs_sb_get_free_blocks(const struct ext2_sblock * sb)1089f5dd8b6SStefan Brüns uint64_t ext4fs_sb_get_free_blocks(const struct ext2_sblock *sb)
1099f5dd8b6SStefan Brüns {
1109f5dd8b6SStefan Brüns uint64_t free_blocks = le32_to_cpu(sb->free_blocks);
1119f5dd8b6SStefan Brüns free_blocks += (uint64_t)le32_to_cpu(sb->free_blocks_high) << 32;
1129f5dd8b6SStefan Brüns return free_blocks;
1139f5dd8b6SStefan Brüns }
1149f5dd8b6SStefan Brüns
ext4fs_sb_set_free_blocks(struct ext2_sblock * sb,uint64_t free_blocks)1159f5dd8b6SStefan Brüns void ext4fs_sb_set_free_blocks(struct ext2_sblock *sb, uint64_t free_blocks)
1169f5dd8b6SStefan Brüns {
1179f5dd8b6SStefan Brüns sb->free_blocks = cpu_to_le32(free_blocks & 0xffffffff);
1189f5dd8b6SStefan Brüns sb->free_blocks_high = cpu_to_le16(free_blocks >> 32);
1199f5dd8b6SStefan Brüns }
1209f5dd8b6SStefan Brüns
ext4fs_bg_get_free_blocks(const struct ext2_block_group * bg,const struct ext_filesystem * fs)1219f5dd8b6SStefan Brüns uint32_t ext4fs_bg_get_free_blocks(const struct ext2_block_group *bg,
1229f5dd8b6SStefan Brüns const struct ext_filesystem *fs)
1239f5dd8b6SStefan Brüns {
1249f5dd8b6SStefan Brüns uint32_t free_blocks = le16_to_cpu(bg->free_blocks);
1259f5dd8b6SStefan Brüns if (fs->gdsize == 64)
1269f5dd8b6SStefan Brüns free_blocks += le16_to_cpu(bg->free_blocks_high) << 16;
1279f5dd8b6SStefan Brüns return free_blocks;
1289f5dd8b6SStefan Brüns }
1299f5dd8b6SStefan Brüns
1309f5dd8b6SStefan Brüns static inline
ext4fs_bg_get_free_inodes(const struct ext2_block_group * bg,const struct ext_filesystem * fs)1319f5dd8b6SStefan Brüns uint32_t ext4fs_bg_get_free_inodes(const struct ext2_block_group *bg,
1329f5dd8b6SStefan Brüns const struct ext_filesystem *fs)
1339f5dd8b6SStefan Brüns {
1349f5dd8b6SStefan Brüns uint32_t free_inodes = le16_to_cpu(bg->free_inodes);
1359f5dd8b6SStefan Brüns if (fs->gdsize == 64)
1369f5dd8b6SStefan Brüns free_inodes += le16_to_cpu(bg->free_inodes_high) << 16;
1379f5dd8b6SStefan Brüns return free_inodes;
1389f5dd8b6SStefan Brüns }
1399f5dd8b6SStefan Brüns
ext4fs_bg_get_flags(const struct ext2_block_group * bg)1409f5dd8b6SStefan Brüns static inline uint16_t ext4fs_bg_get_flags(const struct ext2_block_group *bg)
1419f5dd8b6SStefan Brüns {
1429f5dd8b6SStefan Brüns return le16_to_cpu(bg->bg_flags);
1439f5dd8b6SStefan Brüns }
1449f5dd8b6SStefan Brüns
ext4fs_bg_set_flags(struct ext2_block_group * bg,uint16_t flags)1459f5dd8b6SStefan Brüns static inline void ext4fs_bg_set_flags(struct ext2_block_group *bg,
1469f5dd8b6SStefan Brüns uint16_t flags)
1479f5dd8b6SStefan Brüns {
1489f5dd8b6SStefan Brüns bg->bg_flags = cpu_to_le16(flags);
1499f5dd8b6SStefan Brüns }
1509f5dd8b6SStefan Brüns
1519f5dd8b6SStefan Brüns /* Block number of the block bitmap */
ext4fs_bg_get_block_id(const struct ext2_block_group * bg,const struct ext_filesystem * fs)1529f5dd8b6SStefan Brüns uint64_t ext4fs_bg_get_block_id(const struct ext2_block_group *bg,
1539f5dd8b6SStefan Brüns const struct ext_filesystem *fs)
1549f5dd8b6SStefan Brüns {
1559f5dd8b6SStefan Brüns uint64_t block_nr = le32_to_cpu(bg->block_id);
1569f5dd8b6SStefan Brüns if (fs->gdsize == 64)
1579f5dd8b6SStefan Brüns block_nr += (uint64_t)le32_to_cpu(bg->block_id_high) << 32;
1589f5dd8b6SStefan Brüns return block_nr;
1599f5dd8b6SStefan Brüns }
1609f5dd8b6SStefan Brüns
1619f5dd8b6SStefan Brüns /* Block number of the inode bitmap */
ext4fs_bg_get_inode_id(const struct ext2_block_group * bg,const struct ext_filesystem * fs)1629f5dd8b6SStefan Brüns uint64_t ext4fs_bg_get_inode_id(const struct ext2_block_group *bg,
1639f5dd8b6SStefan Brüns const struct ext_filesystem *fs)
1649f5dd8b6SStefan Brüns {
1659f5dd8b6SStefan Brüns uint64_t block_nr = le32_to_cpu(bg->inode_id);
1669f5dd8b6SStefan Brüns if (fs->gdsize == 64)
1679f5dd8b6SStefan Brüns block_nr += (uint64_t)le32_to_cpu(bg->inode_id_high) << 32;
1689f5dd8b6SStefan Brüns return block_nr;
1699f5dd8b6SStefan Brüns }
1709f5dd8b6SStefan Brüns #endif
1719f5dd8b6SStefan Brüns
1729f5dd8b6SStefan Brüns /* Block number of the inode table */
ext4fs_bg_get_inode_table_id(const struct ext2_block_group * bg,const struct ext_filesystem * fs)1739f5dd8b6SStefan Brüns uint64_t ext4fs_bg_get_inode_table_id(const struct ext2_block_group *bg,
1749f5dd8b6SStefan Brüns const struct ext_filesystem *fs)
1759f5dd8b6SStefan Brüns {
1769f5dd8b6SStefan Brüns uint64_t block_nr = le32_to_cpu(bg->inode_table_id);
1779f5dd8b6SStefan Brüns if (fs->gdsize == 64)
1789f5dd8b6SStefan Brüns block_nr +=
1799f5dd8b6SStefan Brüns (uint64_t)le32_to_cpu(bg->inode_table_id_high) << 32;
1809f5dd8b6SStefan Brüns return block_nr;
1819f5dd8b6SStefan Brüns }
1829f5dd8b6SStefan Brüns
1839f5dd8b6SStefan Brüns #if defined(CONFIG_EXT4_WRITE)
ext4fs_div_roundup(uint32_t size,uint32_t n)184ed34f34dSUma Shankar uint32_t ext4fs_div_roundup(uint32_t size, uint32_t n)
185ed34f34dSUma Shankar {
186ed34f34dSUma Shankar uint32_t res = size / n;
187ed34f34dSUma Shankar if (res * n != size)
188ed34f34dSUma Shankar res++;
189ed34f34dSUma Shankar
190ed34f34dSUma Shankar return res;
191ed34f34dSUma Shankar }
192ed34f34dSUma Shankar
put_ext4(uint64_t off,void * buf,uint32_t size)193ed34f34dSUma Shankar void put_ext4(uint64_t off, void *buf, uint32_t size)
194ed34f34dSUma Shankar {
195ed34f34dSUma Shankar uint64_t startblock;
196ed34f34dSUma Shankar uint64_t remainder;
197ed34f34dSUma Shankar unsigned char *temp_ptr = NULL;
198ed34f34dSUma Shankar struct ext_filesystem *fs = get_fs();
19950ce4c07SEgbert Eich int log2blksz = fs->dev_desc->log2blksz;
20050ce4c07SEgbert Eich ALLOC_CACHE_ALIGN_BUFFER(unsigned char, sec_buf, fs->dev_desc->blksz);
201ed34f34dSUma Shankar
20250ce4c07SEgbert Eich startblock = off >> log2blksz;
203ed34f34dSUma Shankar startblock += part_offset;
20450ce4c07SEgbert Eich remainder = off & (uint64_t)(fs->dev_desc->blksz - 1);
205ed34f34dSUma Shankar
206ed34f34dSUma Shankar if (fs->dev_desc == NULL)
207ed34f34dSUma Shankar return;
208ed34f34dSUma Shankar
20950ce4c07SEgbert Eich if ((startblock + (size >> log2blksz)) >
210ed34f34dSUma Shankar (part_offset + fs->total_sect)) {
21104735e9cSFrederic Leroy printf("part_offset is " LBAFU "\n", part_offset);
212*dee37fc9SMasahiro Yamada printf("total_sector is %llu\n", fs->total_sect);
213ed34f34dSUma Shankar printf("error: overflow occurs\n");
214ed34f34dSUma Shankar return;
215ed34f34dSUma Shankar }
216ed34f34dSUma Shankar
217ed34f34dSUma Shankar if (remainder) {
2182a981dc2SSimon Glass blk_dread(fs->dev_desc, startblock, 1, sec_buf);
219ed34f34dSUma Shankar temp_ptr = sec_buf;
2202a981dc2SSimon Glass memcpy((temp_ptr + remainder), (unsigned char *)buf, size);
2212a981dc2SSimon Glass blk_dwrite(fs->dev_desc, startblock, 1, sec_buf);
222ed34f34dSUma Shankar } else {
22350ce4c07SEgbert Eich if (size >> log2blksz != 0) {
2242a981dc2SSimon Glass blk_dwrite(fs->dev_desc, startblock, size >> log2blksz,
225ed34f34dSUma Shankar (unsigned long *)buf);
226ed34f34dSUma Shankar } else {
2272a981dc2SSimon Glass blk_dread(fs->dev_desc, startblock, 1, sec_buf);
228ed34f34dSUma Shankar temp_ptr = sec_buf;
229ed34f34dSUma Shankar memcpy(temp_ptr, buf, size);
2302a981dc2SSimon Glass blk_dwrite(fs->dev_desc, startblock, 1,
231ed34f34dSUma Shankar (unsigned long *)sec_buf);
232ed34f34dSUma Shankar }
233ed34f34dSUma Shankar }
234ed34f34dSUma Shankar }
235ed34f34dSUma Shankar
_get_new_inode_no(unsigned char * buffer)236ed34f34dSUma Shankar static int _get_new_inode_no(unsigned char *buffer)
237ed34f34dSUma Shankar {
238ed34f34dSUma Shankar struct ext_filesystem *fs = get_fs();
239ed34f34dSUma Shankar unsigned char input;
240ed34f34dSUma Shankar int operand, status;
241ed34f34dSUma Shankar int count = 1;
242ed34f34dSUma Shankar int j = 0;
243ed34f34dSUma Shankar
244ed34f34dSUma Shankar /* get the blocksize of the filesystem */
245ed34f34dSUma Shankar unsigned char *ptr = buffer;
246ed34f34dSUma Shankar while (*ptr == 255) {
247ed34f34dSUma Shankar ptr++;
248ed34f34dSUma Shankar count += 8;
24958a9ecbaSMichael Walle if (count > le32_to_cpu(ext4fs_root->sblock.inodes_per_group))
250ed34f34dSUma Shankar return -1;
251ed34f34dSUma Shankar }
252ed34f34dSUma Shankar
253ed34f34dSUma Shankar for (j = 0; j < fs->blksz; j++) {
254ed34f34dSUma Shankar input = *ptr;
255ed34f34dSUma Shankar int i = 0;
256ed34f34dSUma Shankar while (i <= 7) {
257ed34f34dSUma Shankar operand = 1 << i;
258ed34f34dSUma Shankar status = input & operand;
259ed34f34dSUma Shankar if (status) {
260ed34f34dSUma Shankar i++;
261ed34f34dSUma Shankar count++;
262ed34f34dSUma Shankar } else {
263ed34f34dSUma Shankar *ptr |= operand;
264ed34f34dSUma Shankar return count;
265ed34f34dSUma Shankar }
266ed34f34dSUma Shankar }
267ed34f34dSUma Shankar ptr = ptr + 1;
268ed34f34dSUma Shankar }
269ed34f34dSUma Shankar
270ed34f34dSUma Shankar return -1;
271ed34f34dSUma Shankar }
272ed34f34dSUma Shankar
_get_new_blk_no(unsigned char * buffer)273ed34f34dSUma Shankar static int _get_new_blk_no(unsigned char *buffer)
274ed34f34dSUma Shankar {
2750ceef3d3SStefan Brüns int operand;
276ed34f34dSUma Shankar int count = 0;
2770ceef3d3SStefan Brüns int i;
278ed34f34dSUma Shankar unsigned char *ptr = buffer;
279ed34f34dSUma Shankar struct ext_filesystem *fs = get_fs();
280ed34f34dSUma Shankar
281ed34f34dSUma Shankar while (*ptr == 255) {
282ed34f34dSUma Shankar ptr++;
283ed34f34dSUma Shankar count += 8;
284ed34f34dSUma Shankar if (count == (fs->blksz * 8))
285ed34f34dSUma Shankar return -1;
286ed34f34dSUma Shankar }
287ed34f34dSUma Shankar
2880ceef3d3SStefan Brüns if (fs->blksz == 1024)
2890ceef3d3SStefan Brüns count += 1;
2900ceef3d3SStefan Brüns
2910ceef3d3SStefan Brüns for (i = 0; i <= 7; i++) {
292ed34f34dSUma Shankar operand = 1 << i;
2930ceef3d3SStefan Brüns if (*ptr & operand) {
294ed34f34dSUma Shankar count++;
295ed34f34dSUma Shankar } else {
296ed34f34dSUma Shankar *ptr |= operand;
297ed34f34dSUma Shankar return count;
298ed34f34dSUma Shankar }
299ed34f34dSUma Shankar }
300ed34f34dSUma Shankar
301ed34f34dSUma Shankar return -1;
302ed34f34dSUma Shankar }
303ed34f34dSUma Shankar
ext4fs_set_block_bmap(long int blockno,unsigned char * buffer,int index)304ed34f34dSUma Shankar int ext4fs_set_block_bmap(long int blockno, unsigned char *buffer, int index)
305ed34f34dSUma Shankar {
306ed34f34dSUma Shankar int i, remainder, status;
307ed34f34dSUma Shankar unsigned char *ptr = buffer;
308ed34f34dSUma Shankar unsigned char operand;
309ed34f34dSUma Shankar i = blockno / 8;
310ed34f34dSUma Shankar remainder = blockno % 8;
311ed34f34dSUma Shankar int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
312ed34f34dSUma Shankar
313ed34f34dSUma Shankar i = i - (index * blocksize);
314ed34f34dSUma Shankar if (blocksize != 1024) {
315ed34f34dSUma Shankar ptr = ptr + i;
316ed34f34dSUma Shankar operand = 1 << remainder;
317ed34f34dSUma Shankar status = *ptr & operand;
318ed34f34dSUma Shankar if (status)
319ed34f34dSUma Shankar return -1;
320ed34f34dSUma Shankar
321ed34f34dSUma Shankar *ptr = *ptr | operand;
322ed34f34dSUma Shankar return 0;
323ed34f34dSUma Shankar } else {
324ed34f34dSUma Shankar if (remainder == 0) {
325ed34f34dSUma Shankar ptr = ptr + i - 1;
326ed34f34dSUma Shankar operand = (1 << 7);
327ed34f34dSUma Shankar } else {
328ed34f34dSUma Shankar ptr = ptr + i;
329ed34f34dSUma Shankar operand = (1 << (remainder - 1));
330ed34f34dSUma Shankar }
331ed34f34dSUma Shankar status = *ptr & operand;
332ed34f34dSUma Shankar if (status)
333ed34f34dSUma Shankar return -1;
334ed34f34dSUma Shankar
335ed34f34dSUma Shankar *ptr = *ptr | operand;
336ed34f34dSUma Shankar return 0;
337ed34f34dSUma Shankar }
338ed34f34dSUma Shankar }
339ed34f34dSUma Shankar
ext4fs_reset_block_bmap(long int blockno,unsigned char * buffer,int index)340ed34f34dSUma Shankar void ext4fs_reset_block_bmap(long int blockno, unsigned char *buffer, int index)
341ed34f34dSUma Shankar {
342ed34f34dSUma Shankar int i, remainder, status;
343ed34f34dSUma Shankar unsigned char *ptr = buffer;
344ed34f34dSUma Shankar unsigned char operand;
345ed34f34dSUma Shankar i = blockno / 8;
346ed34f34dSUma Shankar remainder = blockno % 8;
347ed34f34dSUma Shankar int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
348ed34f34dSUma Shankar
349ed34f34dSUma Shankar i = i - (index * blocksize);
350ed34f34dSUma Shankar if (blocksize != 1024) {
351ed34f34dSUma Shankar ptr = ptr + i;
352ed34f34dSUma Shankar operand = (1 << remainder);
353ed34f34dSUma Shankar status = *ptr & operand;
354ed34f34dSUma Shankar if (status)
355ed34f34dSUma Shankar *ptr = *ptr & ~(operand);
356ed34f34dSUma Shankar } else {
357ed34f34dSUma Shankar if (remainder == 0) {
358ed34f34dSUma Shankar ptr = ptr + i - 1;
359ed34f34dSUma Shankar operand = (1 << 7);
360ed34f34dSUma Shankar } else {
361ed34f34dSUma Shankar ptr = ptr + i;
362ed34f34dSUma Shankar operand = (1 << (remainder - 1));
363ed34f34dSUma Shankar }
364ed34f34dSUma Shankar status = *ptr & operand;
365ed34f34dSUma Shankar if (status)
366ed34f34dSUma Shankar *ptr = *ptr & ~(operand);
367ed34f34dSUma Shankar }
368ed34f34dSUma Shankar }
369ed34f34dSUma Shankar
ext4fs_set_inode_bmap(int inode_no,unsigned char * buffer,int index)370ed34f34dSUma Shankar int ext4fs_set_inode_bmap(int inode_no, unsigned char *buffer, int index)
371ed34f34dSUma Shankar {
372ed34f34dSUma Shankar int i, remainder, status;
373ed34f34dSUma Shankar unsigned char *ptr = buffer;
374ed34f34dSUma Shankar unsigned char operand;
375ed34f34dSUma Shankar
37658a9ecbaSMichael Walle inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group));
377ed34f34dSUma Shankar i = inode_no / 8;
378ed34f34dSUma Shankar remainder = inode_no % 8;
379ed34f34dSUma Shankar if (remainder == 0) {
380ed34f34dSUma Shankar ptr = ptr + i - 1;
381ed34f34dSUma Shankar operand = (1 << 7);
382ed34f34dSUma Shankar } else {
383ed34f34dSUma Shankar ptr = ptr + i;
384ed34f34dSUma Shankar operand = (1 << (remainder - 1));
385ed34f34dSUma Shankar }
386ed34f34dSUma Shankar status = *ptr & operand;
387ed34f34dSUma Shankar if (status)
388ed34f34dSUma Shankar return -1;
389ed34f34dSUma Shankar
390ed34f34dSUma Shankar *ptr = *ptr | operand;
391ed34f34dSUma Shankar
392ed34f34dSUma Shankar return 0;
393ed34f34dSUma Shankar }
394ed34f34dSUma Shankar
ext4fs_reset_inode_bmap(int inode_no,unsigned char * buffer,int index)395ed34f34dSUma Shankar void ext4fs_reset_inode_bmap(int inode_no, unsigned char *buffer, int index)
396ed34f34dSUma Shankar {
397ed34f34dSUma Shankar int i, remainder, status;
398ed34f34dSUma Shankar unsigned char *ptr = buffer;
399ed34f34dSUma Shankar unsigned char operand;
400ed34f34dSUma Shankar
40158a9ecbaSMichael Walle inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group));
402ed34f34dSUma Shankar i = inode_no / 8;
403ed34f34dSUma Shankar remainder = inode_no % 8;
404ed34f34dSUma Shankar if (remainder == 0) {
405ed34f34dSUma Shankar ptr = ptr + i - 1;
406ed34f34dSUma Shankar operand = (1 << 7);
407ed34f34dSUma Shankar } else {
408ed34f34dSUma Shankar ptr = ptr + i;
409ed34f34dSUma Shankar operand = (1 << (remainder - 1));
410ed34f34dSUma Shankar }
411ed34f34dSUma Shankar status = *ptr & operand;
412ed34f34dSUma Shankar if (status)
413ed34f34dSUma Shankar *ptr = *ptr & ~(operand);
414ed34f34dSUma Shankar }
415ed34f34dSUma Shankar
ext4fs_checksum_update(uint32_t i)41658a9ecbaSMichael Walle uint16_t ext4fs_checksum_update(uint32_t i)
417ed34f34dSUma Shankar {
418ed34f34dSUma Shankar struct ext2_block_group *desc;
419ed34f34dSUma Shankar struct ext_filesystem *fs = get_fs();
42058a9ecbaSMichael Walle uint16_t crc = 0;
42158a9ecbaSMichael Walle __le32 le32_i = cpu_to_le32(i);
422ed34f34dSUma Shankar
423688d0e79SStefan Brüns desc = ext4fs_get_group_descriptor(fs, i);
42458a9ecbaSMichael Walle if (le32_to_cpu(fs->sb->feature_ro_compat) & EXT4_FEATURE_RO_COMPAT_GDT_CSUM) {
425ed34f34dSUma Shankar int offset = offsetof(struct ext2_block_group, bg_checksum);
426ed34f34dSUma Shankar
427ed34f34dSUma Shankar crc = ext2fs_crc16(~0, fs->sb->unique_id,
428ed34f34dSUma Shankar sizeof(fs->sb->unique_id));
42958a9ecbaSMichael Walle crc = ext2fs_crc16(crc, &le32_i, sizeof(le32_i));
430ed34f34dSUma Shankar crc = ext2fs_crc16(crc, desc, offset);
431ed34f34dSUma Shankar offset += sizeof(desc->bg_checksum); /* skip checksum */
432ed34f34dSUma Shankar assert(offset == sizeof(*desc));
433385b7318STuomas Tynkkynen if (offset < fs->gdsize) {
434385b7318STuomas Tynkkynen crc = ext2fs_crc16(crc, (__u8 *)desc + offset,
435385b7318STuomas Tynkkynen fs->gdsize - offset);
436385b7318STuomas Tynkkynen }
437ed34f34dSUma Shankar }
438ed34f34dSUma Shankar
439ed34f34dSUma Shankar return crc;
440ed34f34dSUma Shankar }
441ed34f34dSUma Shankar
check_void_in_dentry(struct ext2_dirent * dir,char * filename)442ed34f34dSUma Shankar static int check_void_in_dentry(struct ext2_dirent *dir, char *filename)
443ed34f34dSUma Shankar {
444ed34f34dSUma Shankar int dentry_length;
445ed34f34dSUma Shankar int sizeof_void_space;
446ed34f34dSUma Shankar int new_entry_byte_reqd;
447ed34f34dSUma Shankar short padding_factor = 0;
448ed34f34dSUma Shankar
449ed34f34dSUma Shankar if (dir->namelen % 4 != 0)
450ed34f34dSUma Shankar padding_factor = 4 - (dir->namelen % 4);
451ed34f34dSUma Shankar
452ed34f34dSUma Shankar dentry_length = sizeof(struct ext2_dirent) +
453ed34f34dSUma Shankar dir->namelen + padding_factor;
45458a9ecbaSMichael Walle sizeof_void_space = le16_to_cpu(dir->direntlen) - dentry_length;
455ed34f34dSUma Shankar if (sizeof_void_space == 0)
456ed34f34dSUma Shankar return 0;
457ed34f34dSUma Shankar
458ed34f34dSUma Shankar padding_factor = 0;
459ed34f34dSUma Shankar if (strlen(filename) % 4 != 0)
460ed34f34dSUma Shankar padding_factor = 4 - (strlen(filename) % 4);
461ed34f34dSUma Shankar
462ed34f34dSUma Shankar new_entry_byte_reqd = strlen(filename) +
463ed34f34dSUma Shankar sizeof(struct ext2_dirent) + padding_factor;
464ed34f34dSUma Shankar if (sizeof_void_space >= new_entry_byte_reqd) {
46558a9ecbaSMichael Walle dir->direntlen = cpu_to_le16(dentry_length);
466ed34f34dSUma Shankar return sizeof_void_space;
467ed34f34dSUma Shankar }
468ed34f34dSUma Shankar
469ed34f34dSUma Shankar return 0;
470ed34f34dSUma Shankar }
471ed34f34dSUma Shankar
ext4fs_update_parent_dentry(char * filename,int file_type)472a0d767e2SStefan Brüns int ext4fs_update_parent_dentry(char *filename, int file_type)
473ed34f34dSUma Shankar {
474ed34f34dSUma Shankar unsigned int *zero_buffer = NULL;
475ed34f34dSUma Shankar char *root_first_block_buffer = NULL;
476a321abd5SStefan Brüns int blk_idx;
477ed34f34dSUma Shankar long int first_block_no_of_root = 0;
478ed34f34dSUma Shankar int totalbytes = 0;
479ed34f34dSUma Shankar unsigned int new_entry_byte_reqd;
480ed34f34dSUma Shankar int sizeof_void_space = 0;
481ed34f34dSUma Shankar int templength = 0;
482a0d767e2SStefan Brüns int inodeno = -1;
483ed34f34dSUma Shankar int status;
484ed34f34dSUma Shankar struct ext_filesystem *fs = get_fs();
485ed34f34dSUma Shankar /* directory entry */
486ed34f34dSUma Shankar struct ext2_dirent *dir;
487ed34f34dSUma Shankar char *temp_dir = NULL;
48858a9ecbaSMichael Walle uint32_t new_blk_no;
48958a9ecbaSMichael Walle uint32_t new_size;
49058a9ecbaSMichael Walle uint32_t new_blockcnt;
491a321abd5SStefan Brüns uint32_t directory_blocks;
492ed34f34dSUma Shankar
493ed34f34dSUma Shankar zero_buffer = zalloc(fs->blksz);
494ed34f34dSUma Shankar if (!zero_buffer) {
495ed34f34dSUma Shankar printf("No Memory\n");
496a0d767e2SStefan Brüns return -1;
497ed34f34dSUma Shankar }
498ed34f34dSUma Shankar root_first_block_buffer = zalloc(fs->blksz);
499ed34f34dSUma Shankar if (!root_first_block_buffer) {
500ed34f34dSUma Shankar free(zero_buffer);
501ed34f34dSUma Shankar printf("No Memory\n");
502a0d767e2SStefan Brüns return -1;
503ed34f34dSUma Shankar }
504a321abd5SStefan Brüns new_entry_byte_reqd = ROUND(strlen(filename) +
505a321abd5SStefan Brüns sizeof(struct ext2_dirent), 4);
506ed34f34dSUma Shankar restart:
507a321abd5SStefan Brüns directory_blocks = le32_to_cpu(g_parent_inode->size) >>
508a321abd5SStefan Brüns LOG2_BLOCK_SIZE(ext4fs_root);
509a321abd5SStefan Brüns blk_idx = directory_blocks - 1;
510ed34f34dSUma Shankar
511a321abd5SStefan Brüns restart_read:
512ed34f34dSUma Shankar /* read the block no allocated to a file */
513a321abd5SStefan Brüns first_block_no_of_root = read_allocated_block(g_parent_inode, blk_idx);
514a321abd5SStefan Brüns if (first_block_no_of_root <= 0)
515a321abd5SStefan Brüns goto fail;
516ed34f34dSUma Shankar
51704735e9cSFrederic Leroy status = ext4fs_devread((lbaint_t)first_block_no_of_root
518ed34f34dSUma Shankar * fs->sect_perblk,
519ed34f34dSUma Shankar 0, fs->blksz, root_first_block_buffer);
520ed34f34dSUma Shankar if (status == 0)
521ed34f34dSUma Shankar goto fail;
522ed34f34dSUma Shankar
523ed34f34dSUma Shankar if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root))
524ed34f34dSUma Shankar goto fail;
525ed34f34dSUma Shankar dir = (struct ext2_dirent *)root_first_block_buffer;
526ed34f34dSUma Shankar totalbytes = 0;
527a321abd5SStefan Brüns
52858a9ecbaSMichael Walle while (le16_to_cpu(dir->direntlen) > 0) {
529a321abd5SStefan Brüns unsigned short used_len = ROUND(dir->namelen +
530a321abd5SStefan Brüns sizeof(struct ext2_dirent), 4);
531ed34f34dSUma Shankar
532a321abd5SStefan Brüns /* last entry of block */
53358a9ecbaSMichael Walle if (fs->blksz - totalbytes == le16_to_cpu(dir->direntlen)) {
534ed34f34dSUma Shankar
535a321abd5SStefan Brüns /* check if new entry fits */
536a321abd5SStefan Brüns if ((used_len + new_entry_byte_reqd) <=
537a321abd5SStefan Brüns le16_to_cpu(dir->direntlen)) {
538a321abd5SStefan Brüns dir->direntlen = cpu_to_le16(used_len);
539a321abd5SStefan Brüns break;
540a321abd5SStefan Brüns } else {
541a321abd5SStefan Brüns if (blk_idx > 0) {
542a321abd5SStefan Brüns printf("Block full, trying previous\n");
543a321abd5SStefan Brüns blk_idx--;
544a321abd5SStefan Brüns goto restart_read;
545a321abd5SStefan Brüns }
546a321abd5SStefan Brüns printf("All blocks full: Allocate new\n");
547ed34f34dSUma Shankar
548b96c3c72SStefan Brüns if (le32_to_cpu(g_parent_inode->flags) &
549b96c3c72SStefan Brüns EXT4_EXTENTS_FL) {
550b96c3c72SStefan Brüns printf("Directory uses extents\n");
551b96c3c72SStefan Brüns goto fail;
552b96c3c72SStefan Brüns }
553a321abd5SStefan Brüns if (directory_blocks >= INDIRECT_BLOCKS) {
554ed34f34dSUma Shankar printf("Directory exceeds limit\n");
555ed34f34dSUma Shankar goto fail;
556ed34f34dSUma Shankar }
55758a9ecbaSMichael Walle new_blk_no = ext4fs_get_new_blk_no();
55858a9ecbaSMichael Walle if (new_blk_no == -1) {
559ed34f34dSUma Shankar printf("no block left to assign\n");
560ed34f34dSUma Shankar goto fail;
561ed34f34dSUma Shankar }
56258a9ecbaSMichael Walle put_ext4((uint64_t)new_blk_no * fs->blksz, zero_buffer, fs->blksz);
563a321abd5SStefan Brüns g_parent_inode->b.blocks.
564a321abd5SStefan Brüns dir_blocks[directory_blocks] =
56558a9ecbaSMichael Walle cpu_to_le32(new_blk_no);
56658a9ecbaSMichael Walle
56758a9ecbaSMichael Walle new_size = le32_to_cpu(g_parent_inode->size);
56858a9ecbaSMichael Walle new_size += fs->blksz;
56958a9ecbaSMichael Walle g_parent_inode->size = cpu_to_le32(new_size);
57058a9ecbaSMichael Walle
57158a9ecbaSMichael Walle new_blockcnt = le32_to_cpu(g_parent_inode->blockcnt);
57258a9ecbaSMichael Walle new_blockcnt += fs->sect_perblk;
57358a9ecbaSMichael Walle g_parent_inode->blockcnt = cpu_to_le32(new_blockcnt);
57458a9ecbaSMichael Walle
575ed34f34dSUma Shankar if (ext4fs_put_metadata
576ed34f34dSUma Shankar (root_first_block_buffer,
577ed34f34dSUma Shankar first_block_no_of_root))
578ed34f34dSUma Shankar goto fail;
579ed34f34dSUma Shankar goto restart;
580ed34f34dSUma Shankar }
581ed34f34dSUma Shankar }
582ed34f34dSUma Shankar
58358a9ecbaSMichael Walle templength = le16_to_cpu(dir->direntlen);
584ed34f34dSUma Shankar totalbytes = totalbytes + templength;
585ed34f34dSUma Shankar sizeof_void_space = check_void_in_dentry(dir, filename);
586ed34f34dSUma Shankar if (sizeof_void_space)
587ed34f34dSUma Shankar break;
588ed34f34dSUma Shankar
589ed34f34dSUma Shankar dir = (struct ext2_dirent *)((char *)dir + templength);
590ed34f34dSUma Shankar }
591ed34f34dSUma Shankar
592ed34f34dSUma Shankar /* make a pointer ready for creating next directory entry */
59358a9ecbaSMichael Walle templength = le16_to_cpu(dir->direntlen);
594ed34f34dSUma Shankar totalbytes = totalbytes + templength;
595ed34f34dSUma Shankar dir = (struct ext2_dirent *)((char *)dir + templength);
596ed34f34dSUma Shankar
597ed34f34dSUma Shankar /* get the next available inode number */
598ed34f34dSUma Shankar inodeno = ext4fs_get_new_inode_no();
599ed34f34dSUma Shankar if (inodeno == -1) {
600ed34f34dSUma Shankar printf("no inode left to assign\n");
601ed34f34dSUma Shankar goto fail;
602ed34f34dSUma Shankar }
60358a9ecbaSMichael Walle dir->inode = cpu_to_le32(inodeno);
604ed34f34dSUma Shankar if (sizeof_void_space)
60558a9ecbaSMichael Walle dir->direntlen = cpu_to_le16(sizeof_void_space);
606ed34f34dSUma Shankar else
60758a9ecbaSMichael Walle dir->direntlen = cpu_to_le16(fs->blksz - totalbytes);
608ed34f34dSUma Shankar
609ed34f34dSUma Shankar dir->namelen = strlen(filename);
610ed34f34dSUma Shankar dir->filetype = FILETYPE_REG; /* regular file */
611ed34f34dSUma Shankar temp_dir = (char *)dir;
612ed34f34dSUma Shankar temp_dir = temp_dir + sizeof(struct ext2_dirent);
613ed34f34dSUma Shankar memcpy(temp_dir, filename, strlen(filename));
614ed34f34dSUma Shankar
615ed34f34dSUma Shankar /* update or write the 1st block of root inode */
616ed34f34dSUma Shankar if (ext4fs_put_metadata(root_first_block_buffer,
617ed34f34dSUma Shankar first_block_no_of_root))
618ed34f34dSUma Shankar goto fail;
619ed34f34dSUma Shankar
620ed34f34dSUma Shankar fail:
621ed34f34dSUma Shankar free(zero_buffer);
622ed34f34dSUma Shankar free(root_first_block_buffer);
623a0d767e2SStefan Brüns
624a0d767e2SStefan Brüns return inodeno;
625ed34f34dSUma Shankar }
626ed34f34dSUma Shankar
search_dir(struct ext2_inode * parent_inode,char * dirname)627ed34f34dSUma Shankar static int search_dir(struct ext2_inode *parent_inode, char *dirname)
628ed34f34dSUma Shankar {
629ed34f34dSUma Shankar int status;
63076a29519SStefan Brüns int inodeno = 0;
631b7dd40d0SStefan Brüns int offset;
632b7dd40d0SStefan Brüns int blk_idx;
633ed34f34dSUma Shankar long int blknr;
634b7dd40d0SStefan Brüns char *block_buffer = NULL;
635ed34f34dSUma Shankar struct ext2_dirent *dir = NULL;
636ed34f34dSUma Shankar struct ext_filesystem *fs = get_fs();
637b7dd40d0SStefan Brüns uint32_t directory_blocks;
638b7dd40d0SStefan Brüns char *direntname;
639ed34f34dSUma Shankar
640b7dd40d0SStefan Brüns directory_blocks = le32_to_cpu(parent_inode->size) >>
641b7dd40d0SStefan Brüns LOG2_BLOCK_SIZE(ext4fs_root);
642ed34f34dSUma Shankar
643ed34f34dSUma Shankar block_buffer = zalloc(fs->blksz);
644ed34f34dSUma Shankar if (!block_buffer)
645ed34f34dSUma Shankar goto fail;
646ed34f34dSUma Shankar
647b7dd40d0SStefan Brüns /* get the block no allocated to a file */
648b7dd40d0SStefan Brüns for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) {
649b7dd40d0SStefan Brüns blknr = read_allocated_block(parent_inode, blk_idx);
650de9e8316SStefan Brüns if (blknr <= 0)
651b7dd40d0SStefan Brüns goto fail;
652b7dd40d0SStefan Brüns
653b7dd40d0SStefan Brüns /* read the directory block */
65404735e9cSFrederic Leroy status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk,
655ed34f34dSUma Shankar 0, fs->blksz, (char *)block_buffer);
656ed34f34dSUma Shankar if (status == 0)
657ed34f34dSUma Shankar goto fail;
658ed34f34dSUma Shankar
659b7dd40d0SStefan Brüns offset = 0;
660b7dd40d0SStefan Brüns do {
661ecdfb419SIan Ray if (offset & 3) {
662ecdfb419SIan Ray printf("Badly aligned ext2_dirent\n");
663ecdfb419SIan Ray break;
664ecdfb419SIan Ray }
665ecdfb419SIan Ray
666b7dd40d0SStefan Brüns dir = (struct ext2_dirent *)(block_buffer + offset);
667b7dd40d0SStefan Brüns direntname = (char*)(dir) + sizeof(struct ext2_dirent);
668b7dd40d0SStefan Brüns
669b7dd40d0SStefan Brüns int direntlen = le16_to_cpu(dir->direntlen);
670b7dd40d0SStefan Brüns if (direntlen < sizeof(struct ext2_dirent))
671b7dd40d0SStefan Brüns break;
672b7dd40d0SStefan Brüns
673b7dd40d0SStefan Brüns if (dir->inode && (strlen(dirname) == dir->namelen) &&
674b7dd40d0SStefan Brüns (strncmp(dirname, direntname, dir->namelen) == 0)) {
67558a9ecbaSMichael Walle inodeno = le32_to_cpu(dir->inode);
676ed34f34dSUma Shankar break;
677ed34f34dSUma Shankar }
678ed34f34dSUma Shankar
679b7dd40d0SStefan Brüns offset += direntlen;
680ed34f34dSUma Shankar
681b7dd40d0SStefan Brüns } while (offset < fs->blksz);
682ed34f34dSUma Shankar
683b7dd40d0SStefan Brüns if (inodeno > 0) {
684ed34f34dSUma Shankar free(block_buffer);
68576a29519SStefan Brüns return inodeno;
686ed34f34dSUma Shankar }
687b7dd40d0SStefan Brüns }
688ed34f34dSUma Shankar
689ed34f34dSUma Shankar fail:
690ed34f34dSUma Shankar free(block_buffer);
691ed34f34dSUma Shankar
692ed34f34dSUma Shankar return -1;
693ed34f34dSUma Shankar }
694ed34f34dSUma Shankar
find_dir_depth(char * dirname)695ed34f34dSUma Shankar static int find_dir_depth(char *dirname)
696ed34f34dSUma Shankar {
697ed34f34dSUma Shankar char *token = strtok(dirname, "/");
698ed34f34dSUma Shankar int count = 0;
699ed34f34dSUma Shankar while (token != NULL) {
700ed34f34dSUma Shankar token = strtok(NULL, "/");
701ed34f34dSUma Shankar count++;
702ed34f34dSUma Shankar }
703ed34f34dSUma Shankar return count + 1 + 1;
704ed34f34dSUma Shankar /*
705ed34f34dSUma Shankar * for example for string /home/temp
706ed34f34dSUma Shankar * depth=home(1)+temp(1)+1 extra for NULL;
707ed34f34dSUma Shankar * so count is 4;
708ed34f34dSUma Shankar */
709ed34f34dSUma Shankar }
710ed34f34dSUma Shankar
parse_path(char ** arr,char * dirname)711ed34f34dSUma Shankar static int parse_path(char **arr, char *dirname)
712ed34f34dSUma Shankar {
713ed34f34dSUma Shankar char *token = strtok(dirname, "/");
714ed34f34dSUma Shankar int i = 0;
715ed34f34dSUma Shankar
716ed34f34dSUma Shankar /* add root */
717ed34f34dSUma Shankar arr[i] = zalloc(strlen("/") + 1);
718ed34f34dSUma Shankar if (!arr[i])
719ed34f34dSUma Shankar return -ENOMEM;
720934b14f2SStephen Warren memcpy(arr[i++], "/", strlen("/"));
721ed34f34dSUma Shankar
722ed34f34dSUma Shankar /* add each path entry after root */
723ed34f34dSUma Shankar while (token != NULL) {
724ed34f34dSUma Shankar arr[i] = zalloc(strlen(token) + 1);
725ed34f34dSUma Shankar if (!arr[i])
726ed34f34dSUma Shankar return -ENOMEM;
727ed34f34dSUma Shankar memcpy(arr[i++], token, strlen(token));
728ed34f34dSUma Shankar token = strtok(NULL, "/");
729ed34f34dSUma Shankar }
730ed34f34dSUma Shankar arr[i] = NULL;
731ed34f34dSUma Shankar
732ed34f34dSUma Shankar return 0;
733ed34f34dSUma Shankar }
734ed34f34dSUma Shankar
ext4fs_iget(int inode_no,struct ext2_inode * inode)735ed34f34dSUma Shankar int ext4fs_iget(int inode_no, struct ext2_inode *inode)
736ed34f34dSUma Shankar {
737ed34f34dSUma Shankar if (ext4fs_read_inode(ext4fs_root, inode_no, inode) == 0)
738ed34f34dSUma Shankar return -1;
739ed34f34dSUma Shankar
740ed34f34dSUma Shankar return 0;
741ed34f34dSUma Shankar }
742ed34f34dSUma Shankar
743ed34f34dSUma Shankar /*
744ed34f34dSUma Shankar * Function: ext4fs_get_parent_inode_num
745ed34f34dSUma Shankar * Return Value: inode Number of the parent directory of file/Directory to be
746ed34f34dSUma Shankar * created
747ed34f34dSUma Shankar * dirname : Input parmater, input path name of the file/directory to be created
748ed34f34dSUma Shankar * dname : Output parameter, to be filled with the name of the directory
749ed34f34dSUma Shankar * extracted from dirname
750ed34f34dSUma Shankar */
ext4fs_get_parent_inode_num(const char * dirname,char * dname,int flags)751ed34f34dSUma Shankar int ext4fs_get_parent_inode_num(const char *dirname, char *dname, int flags)
752ed34f34dSUma Shankar {
753ed34f34dSUma Shankar int i;
754ed34f34dSUma Shankar int depth = 0;
755ed34f34dSUma Shankar int matched_inode_no;
756ed34f34dSUma Shankar int result_inode_no = -1;
757ed34f34dSUma Shankar char **ptr = NULL;
758ed34f34dSUma Shankar char *depth_dirname = NULL;
759ed34f34dSUma Shankar char *parse_dirname = NULL;
760ed34f34dSUma Shankar struct ext2_inode *parent_inode = NULL;
761ed34f34dSUma Shankar struct ext2_inode *first_inode = NULL;
762ed34f34dSUma Shankar struct ext2_inode temp_inode;
763ed34f34dSUma Shankar
764ed34f34dSUma Shankar if (*dirname != '/') {
765ed34f34dSUma Shankar printf("Please supply Absolute path\n");
766ed34f34dSUma Shankar return -1;
767ed34f34dSUma Shankar }
768ed34f34dSUma Shankar
769ed34f34dSUma Shankar /* TODO: input validation make equivalent to linux */
770ed34f34dSUma Shankar depth_dirname = zalloc(strlen(dirname) + 1);
771ed34f34dSUma Shankar if (!depth_dirname)
772ed34f34dSUma Shankar return -ENOMEM;
773ed34f34dSUma Shankar
774ed34f34dSUma Shankar memcpy(depth_dirname, dirname, strlen(dirname));
775ed34f34dSUma Shankar depth = find_dir_depth(depth_dirname);
776ed34f34dSUma Shankar parse_dirname = zalloc(strlen(dirname) + 1);
777ed34f34dSUma Shankar if (!parse_dirname)
778ed34f34dSUma Shankar goto fail;
779ed34f34dSUma Shankar memcpy(parse_dirname, dirname, strlen(dirname));
780ed34f34dSUma Shankar
781ed34f34dSUma Shankar /* allocate memory for each directory level */
782ed34f34dSUma Shankar ptr = zalloc((depth) * sizeof(char *));
783ed34f34dSUma Shankar if (!ptr)
784ed34f34dSUma Shankar goto fail;
785ed34f34dSUma Shankar if (parse_path(ptr, parse_dirname))
786ed34f34dSUma Shankar goto fail;
787ed34f34dSUma Shankar parent_inode = zalloc(sizeof(struct ext2_inode));
788ed34f34dSUma Shankar if (!parent_inode)
789ed34f34dSUma Shankar goto fail;
790ed34f34dSUma Shankar first_inode = zalloc(sizeof(struct ext2_inode));
791ed34f34dSUma Shankar if (!first_inode)
792ed34f34dSUma Shankar goto fail;
793ed34f34dSUma Shankar memcpy(parent_inode, ext4fs_root->inode, sizeof(struct ext2_inode));
794ed34f34dSUma Shankar memcpy(first_inode, parent_inode, sizeof(struct ext2_inode));
795ed34f34dSUma Shankar if (flags & F_FILE)
796ed34f34dSUma Shankar result_inode_no = EXT2_ROOT_INO;
797ed34f34dSUma Shankar for (i = 1; i < depth; i++) {
798ed34f34dSUma Shankar matched_inode_no = search_dir(parent_inode, ptr[i]);
799ed34f34dSUma Shankar if (matched_inode_no == -1) {
800ed34f34dSUma Shankar if (ptr[i + 1] == NULL && i == 1) {
801ed34f34dSUma Shankar result_inode_no = EXT2_ROOT_INO;
802ed34f34dSUma Shankar goto end;
803ed34f34dSUma Shankar } else {
804ed34f34dSUma Shankar if (ptr[i + 1] == NULL)
805ed34f34dSUma Shankar break;
806ed34f34dSUma Shankar printf("Invalid path\n");
807ed34f34dSUma Shankar result_inode_no = -1;
808ed34f34dSUma Shankar goto fail;
809ed34f34dSUma Shankar }
810ed34f34dSUma Shankar } else {
811ed34f34dSUma Shankar if (ptr[i + 1] != NULL) {
812ed34f34dSUma Shankar memset(parent_inode, '\0',
813ed34f34dSUma Shankar sizeof(struct ext2_inode));
814ed34f34dSUma Shankar if (ext4fs_iget(matched_inode_no,
815ed34f34dSUma Shankar parent_inode)) {
816ed34f34dSUma Shankar result_inode_no = -1;
817ed34f34dSUma Shankar goto fail;
818ed34f34dSUma Shankar }
819ed34f34dSUma Shankar result_inode_no = matched_inode_no;
820ed34f34dSUma Shankar } else {
821ed34f34dSUma Shankar break;
822ed34f34dSUma Shankar }
823ed34f34dSUma Shankar }
824ed34f34dSUma Shankar }
825ed34f34dSUma Shankar
826ed34f34dSUma Shankar end:
827ed34f34dSUma Shankar if (i == 1)
828ed34f34dSUma Shankar matched_inode_no = search_dir(first_inode, ptr[i]);
829ed34f34dSUma Shankar else
830ed34f34dSUma Shankar matched_inode_no = search_dir(parent_inode, ptr[i]);
831ed34f34dSUma Shankar
832ed34f34dSUma Shankar if (matched_inode_no != -1) {
833ed34f34dSUma Shankar ext4fs_iget(matched_inode_no, &temp_inode);
83458a9ecbaSMichael Walle if (le16_to_cpu(temp_inode.mode) & S_IFDIR) {
835ed34f34dSUma Shankar printf("It is a Directory\n");
836ed34f34dSUma Shankar result_inode_no = -1;
837ed34f34dSUma Shankar goto fail;
838ed34f34dSUma Shankar }
839ed34f34dSUma Shankar }
840ed34f34dSUma Shankar
841ed34f34dSUma Shankar if (strlen(ptr[i]) > 256) {
842ed34f34dSUma Shankar result_inode_no = -1;
843ed34f34dSUma Shankar goto fail;
844ed34f34dSUma Shankar }
845ed34f34dSUma Shankar memcpy(dname, ptr[i], strlen(ptr[i]));
846ed34f34dSUma Shankar
847ed34f34dSUma Shankar fail:
848ed34f34dSUma Shankar free(depth_dirname);
849ed34f34dSUma Shankar free(parse_dirname);
850934b14f2SStephen Warren for (i = 0; i < depth; i++) {
851934b14f2SStephen Warren if (!ptr[i])
852934b14f2SStephen Warren break;
853934b14f2SStephen Warren free(ptr[i]);
854934b14f2SStephen Warren }
855ed34f34dSUma Shankar free(ptr);
856ed34f34dSUma Shankar free(parent_inode);
857ed34f34dSUma Shankar free(first_inode);
858ed34f34dSUma Shankar
859ed34f34dSUma Shankar return result_inode_no;
860ed34f34dSUma Shankar }
861ed34f34dSUma Shankar
unlink_filename(char * filename,unsigned int blknr)86276a29519SStefan Brüns static int unlink_filename(char *filename, unsigned int blknr)
863ed34f34dSUma Shankar {
864d1bdf224SStefan Brüns int status;
865d1bdf224SStefan Brüns int inodeno = 0;
86615bf8c4fSStefan Brüns int offset;
86715bf8c4fSStefan Brüns char *block_buffer = NULL;
868ed34f34dSUma Shankar struct ext2_dirent *dir = NULL;
869d1bdf224SStefan Brüns struct ext2_dirent *previous_dir;
870ed34f34dSUma Shankar struct ext_filesystem *fs = get_fs();
871d56b2015SStephen Warren int ret = -1;
872d1bdf224SStefan Brüns char *direntname;
873ed34f34dSUma Shankar
87415bf8c4fSStefan Brüns block_buffer = zalloc(fs->blksz);
87515bf8c4fSStefan Brüns if (!block_buffer)
876ed34f34dSUma Shankar return -ENOMEM;
87715bf8c4fSStefan Brüns
87815bf8c4fSStefan Brüns /* read the directory block */
87976a29519SStefan Brüns status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0,
88015bf8c4fSStefan Brüns fs->blksz, block_buffer);
881ed34f34dSUma Shankar if (status == 0)
882ed34f34dSUma Shankar goto fail;
883ed34f34dSUma Shankar
88415bf8c4fSStefan Brüns offset = 0;
885d1bdf224SStefan Brüns do {
886ecdfb419SIan Ray if (offset & 3) {
887ecdfb419SIan Ray printf("Badly aligned ext2_dirent\n");
888ecdfb419SIan Ray break;
889ecdfb419SIan Ray }
890ecdfb419SIan Ray
891d1bdf224SStefan Brüns previous_dir = dir;
892d1bdf224SStefan Brüns dir = (struct ext2_dirent *)(block_buffer + offset);
893d1bdf224SStefan Brüns direntname = (char *)(dir) + sizeof(struct ext2_dirent);
894d1bdf224SStefan Brüns
895d1bdf224SStefan Brüns int direntlen = le16_to_cpu(dir->direntlen);
896d1bdf224SStefan Brüns if (direntlen < sizeof(struct ext2_dirent))
897d1bdf224SStefan Brüns break;
898d1bdf224SStefan Brüns
89976a29519SStefan Brüns if (dir->inode && (strlen(filename) == dir->namelen) &&
900d1bdf224SStefan Brüns (strncmp(direntname, filename, dir->namelen) == 0)) {
90176a29519SStefan Brüns inodeno = le32_to_cpu(dir->inode);
902ed34f34dSUma Shankar break;
903ed34f34dSUma Shankar }
904ed34f34dSUma Shankar
905d1bdf224SStefan Brüns offset += direntlen;
906ed34f34dSUma Shankar
907d1bdf224SStefan Brüns } while (offset < fs->blksz);
908ed34f34dSUma Shankar
909d1bdf224SStefan Brüns if (inodeno > 0) {
910805e3e00SStefan Brüns printf("file found, deleting\n");
911805e3e00SStefan Brüns if (ext4fs_log_journal(block_buffer, blknr))
912805e3e00SStefan Brüns goto fail;
913ed34f34dSUma Shankar
914805e3e00SStefan Brüns if (previous_dir) {
915805e3e00SStefan Brüns /* merge dir entry with predecessor */
916805e3e00SStefan Brüns uint16_t new_len;
917805e3e00SStefan Brüns new_len = le16_to_cpu(previous_dir->direntlen);
918805e3e00SStefan Brüns new_len += le16_to_cpu(dir->direntlen);
919805e3e00SStefan Brüns previous_dir->direntlen = cpu_to_le16(new_len);
920805e3e00SStefan Brüns } else {
921805e3e00SStefan Brüns /* invalidate dir entry */
922805e3e00SStefan Brüns dir->inode = 0;
923805e3e00SStefan Brüns }
92415bf8c4fSStefan Brüns if (ext4fs_put_metadata(block_buffer, blknr))
925ed34f34dSUma Shankar goto fail;
926d56b2015SStephen Warren ret = inodeno;
927ed34f34dSUma Shankar }
928ed34f34dSUma Shankar fail:
92915bf8c4fSStefan Brüns free(block_buffer);
930ed34f34dSUma Shankar
931d56b2015SStephen Warren return ret;
932ed34f34dSUma Shankar }
933ed34f34dSUma Shankar
ext4fs_filename_unlink(char * filename)93476a29519SStefan Brüns int ext4fs_filename_unlink(char *filename)
935ed34f34dSUma Shankar {
936b7dd40d0SStefan Brüns int blk_idx;
937ed34f34dSUma Shankar long int blknr = -1;
938ed34f34dSUma Shankar int inodeno = -1;
939b7dd40d0SStefan Brüns uint32_t directory_blocks;
940b7dd40d0SStefan Brüns
941b7dd40d0SStefan Brüns directory_blocks = le32_to_cpu(g_parent_inode->size) >>
942b7dd40d0SStefan Brüns LOG2_BLOCK_SIZE(ext4fs_root);
943ed34f34dSUma Shankar
944ed34f34dSUma Shankar /* read the block no allocated to a file */
945b7dd40d0SStefan Brüns for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) {
946b7dd40d0SStefan Brüns blknr = read_allocated_block(g_parent_inode, blk_idx);
947de9e8316SStefan Brüns if (blknr <= 0)
948ed34f34dSUma Shankar break;
94976a29519SStefan Brüns inodeno = unlink_filename(filename, blknr);
950ed34f34dSUma Shankar if (inodeno != -1)
951ed34f34dSUma Shankar return inodeno;
952ed34f34dSUma Shankar }
953ed34f34dSUma Shankar
954ed34f34dSUma Shankar return -1;
955ed34f34dSUma Shankar }
956ed34f34dSUma Shankar
ext4fs_get_new_blk_no(void)95758a9ecbaSMichael Walle uint32_t ext4fs_get_new_blk_no(void)
958ed34f34dSUma Shankar {
959ed34f34dSUma Shankar short i;
960ed34f34dSUma Shankar short status;
961ed34f34dSUma Shankar int remainder;
962ed34f34dSUma Shankar unsigned int bg_idx;
963ed34f34dSUma Shankar static int prev_bg_bitmap_index = -1;
96458a9ecbaSMichael Walle unsigned int blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group);
965ed34f34dSUma Shankar struct ext_filesystem *fs = get_fs();
966ed34f34dSUma Shankar char *journal_buffer = zalloc(fs->blksz);
967ed34f34dSUma Shankar char *zero_buffer = zalloc(fs->blksz);
968ed34f34dSUma Shankar if (!journal_buffer || !zero_buffer)
969ed34f34dSUma Shankar goto fail;
970ed34f34dSUma Shankar
971ed34f34dSUma Shankar if (fs->first_pass_bbmap == 0) {
972ed34f34dSUma Shankar for (i = 0; i < fs->no_blkgrp; i++) {
973688d0e79SStefan Brüns struct ext2_block_group *bgd = NULL;
974688d0e79SStefan Brüns bgd = ext4fs_get_group_descriptor(fs, i);
975688d0e79SStefan Brüns if (ext4fs_bg_get_free_blocks(bgd, fs)) {
976688d0e79SStefan Brüns uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
977688d0e79SStefan Brüns uint64_t b_bitmap_blk =
978688d0e79SStefan Brüns ext4fs_bg_get_block_id(bgd, fs);
979688d0e79SStefan Brüns if (bg_flags & EXT4_BG_BLOCK_UNINIT) {
980ed34f34dSUma Shankar memcpy(fs->blk_bmaps[i], zero_buffer,
981ed34f34dSUma Shankar fs->blksz);
982688d0e79SStefan Brüns put_ext4(b_bitmap_blk * fs->blksz,
983688d0e79SStefan Brüns fs->blk_bmaps[i], fs->blksz);
984688d0e79SStefan Brüns bg_flags &= ~EXT4_BG_BLOCK_UNINIT;
985688d0e79SStefan Brüns ext4fs_bg_set_flags(bgd, bg_flags);
986ed34f34dSUma Shankar }
987ed34f34dSUma Shankar fs->curr_blkno =
988ed34f34dSUma Shankar _get_new_blk_no(fs->blk_bmaps[i]);
989ed34f34dSUma Shankar if (fs->curr_blkno == -1)
990688d0e79SStefan Brüns /* block bitmap is completely filled */
991ed34f34dSUma Shankar continue;
992ed34f34dSUma Shankar fs->curr_blkno = fs->curr_blkno +
993ed34f34dSUma Shankar (i * fs->blksz * 8);
994ed34f34dSUma Shankar fs->first_pass_bbmap++;
995749e93eeSStefan Brüns ext4fs_bg_free_blocks_dec(bgd, fs);
99658a9ecbaSMichael Walle ext4fs_sb_free_blocks_dec(fs->sb);
997688d0e79SStefan Brüns status = ext4fs_devread(b_bitmap_blk *
998688d0e79SStefan Brüns fs->sect_perblk,
999688d0e79SStefan Brüns 0, fs->blksz,
1000ed34f34dSUma Shankar journal_buffer);
1001ed34f34dSUma Shankar if (status == 0)
1002ed34f34dSUma Shankar goto fail;
1003ed34f34dSUma Shankar if (ext4fs_log_journal(journal_buffer,
1004688d0e79SStefan Brüns b_bitmap_blk))
1005ed34f34dSUma Shankar goto fail;
1006ed34f34dSUma Shankar goto success;
1007ed34f34dSUma Shankar } else {
1008ed34f34dSUma Shankar debug("no space left on block group %d\n", i);
1009ed34f34dSUma Shankar }
1010ed34f34dSUma Shankar }
1011ed34f34dSUma Shankar
1012ed34f34dSUma Shankar goto fail;
1013ed34f34dSUma Shankar } else {
1014ed34f34dSUma Shankar fs->curr_blkno++;
1015a9fa0ed1SStefan Brüns restart:
1016ed34f34dSUma Shankar /* get the blockbitmap index respective to blockno */
1017ed34f34dSUma Shankar bg_idx = fs->curr_blkno / blk_per_grp;
101835dd055bSŁukasz Majewski if (fs->blksz == 1024) {
1019ed34f34dSUma Shankar remainder = fs->curr_blkno % blk_per_grp;
1020ed34f34dSUma Shankar if (!remainder)
1021ed34f34dSUma Shankar bg_idx--;
1022ed34f34dSUma Shankar }
1023ed34f34dSUma Shankar
1024ed34f34dSUma Shankar /*
1025ed34f34dSUma Shankar * To skip completely filled block group bitmaps
1026ed34f34dSUma Shankar * Optimize the block allocation
1027ed34f34dSUma Shankar */
1028ed34f34dSUma Shankar if (bg_idx >= fs->no_blkgrp)
1029ed34f34dSUma Shankar goto fail;
1030ed34f34dSUma Shankar
1031688d0e79SStefan Brüns struct ext2_block_group *bgd = NULL;
1032688d0e79SStefan Brüns bgd = ext4fs_get_group_descriptor(fs, bg_idx);
1033688d0e79SStefan Brüns if (ext4fs_bg_get_free_blocks(bgd, fs) == 0) {
1034ed34f34dSUma Shankar debug("block group %u is full. Skipping\n", bg_idx);
1035a9fa0ed1SStefan Brüns fs->curr_blkno = (bg_idx + 1) * blk_per_grp;
1036a9fa0ed1SStefan Brüns if (fs->blksz == 1024)
1037a9fa0ed1SStefan Brüns fs->curr_blkno += 1;
1038ed34f34dSUma Shankar goto restart;
1039ed34f34dSUma Shankar }
1040ed34f34dSUma Shankar
1041688d0e79SStefan Brüns uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1042688d0e79SStefan Brüns uint64_t b_bitmap_blk = ext4fs_bg_get_block_id(bgd, fs);
1043688d0e79SStefan Brüns if (bg_flags & EXT4_BG_BLOCK_UNINIT) {
1044ed34f34dSUma Shankar memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz);
1045688d0e79SStefan Brüns put_ext4(b_bitmap_blk * fs->blksz,
1046688d0e79SStefan Brüns zero_buffer, fs->blksz);
1047688d0e79SStefan Brüns bg_flags &= ~EXT4_BG_BLOCK_UNINIT;
1048688d0e79SStefan Brüns ext4fs_bg_set_flags(bgd, bg_flags);
1049ed34f34dSUma Shankar }
1050ed34f34dSUma Shankar
1051ed34f34dSUma Shankar if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx],
1052ed34f34dSUma Shankar bg_idx) != 0) {
1053ed34f34dSUma Shankar debug("going for restart for the block no %ld %u\n",
1054ed34f34dSUma Shankar fs->curr_blkno, bg_idx);
1055a9fa0ed1SStefan Brüns fs->curr_blkno++;
1056ed34f34dSUma Shankar goto restart;
1057ed34f34dSUma Shankar }
1058ed34f34dSUma Shankar
1059ed34f34dSUma Shankar /* journal backup */
1060ed34f34dSUma Shankar if (prev_bg_bitmap_index != bg_idx) {
1061688d0e79SStefan Brüns status = ext4fs_devread(b_bitmap_blk * fs->sect_perblk,
1062ed34f34dSUma Shankar 0, fs->blksz, journal_buffer);
1063ed34f34dSUma Shankar if (status == 0)
1064ed34f34dSUma Shankar goto fail;
1065688d0e79SStefan Brüns if (ext4fs_log_journal(journal_buffer, b_bitmap_blk))
1066ed34f34dSUma Shankar goto fail;
1067ed34f34dSUma Shankar
1068ed34f34dSUma Shankar prev_bg_bitmap_index = bg_idx;
1069ed34f34dSUma Shankar }
1070749e93eeSStefan Brüns ext4fs_bg_free_blocks_dec(bgd, fs);
107158a9ecbaSMichael Walle ext4fs_sb_free_blocks_dec(fs->sb);
1072ed34f34dSUma Shankar goto success;
1073ed34f34dSUma Shankar }
1074ed34f34dSUma Shankar success:
1075ed34f34dSUma Shankar free(journal_buffer);
1076ed34f34dSUma Shankar free(zero_buffer);
1077ed34f34dSUma Shankar
1078ed34f34dSUma Shankar return fs->curr_blkno;
1079ed34f34dSUma Shankar fail:
1080ed34f34dSUma Shankar free(journal_buffer);
1081ed34f34dSUma Shankar free(zero_buffer);
1082ed34f34dSUma Shankar
1083ed34f34dSUma Shankar return -1;
1084ed34f34dSUma Shankar }
1085ed34f34dSUma Shankar
ext4fs_get_new_inode_no(void)1086ed34f34dSUma Shankar int ext4fs_get_new_inode_no(void)
1087ed34f34dSUma Shankar {
1088ed34f34dSUma Shankar short i;
1089ed34f34dSUma Shankar short status;
1090ed34f34dSUma Shankar unsigned int ibmap_idx;
1091ed34f34dSUma Shankar static int prev_inode_bitmap_index = -1;
109258a9ecbaSMichael Walle unsigned int inodes_per_grp = le32_to_cpu(ext4fs_root->sblock.inodes_per_group);
1093ed34f34dSUma Shankar struct ext_filesystem *fs = get_fs();
1094ed34f34dSUma Shankar char *journal_buffer = zalloc(fs->blksz);
1095ed34f34dSUma Shankar char *zero_buffer = zalloc(fs->blksz);
1096ed34f34dSUma Shankar if (!journal_buffer || !zero_buffer)
1097ed34f34dSUma Shankar goto fail;
1098398d6fadSStefan Brüns int has_gdt_chksum = le32_to_cpu(fs->sb->feature_ro_compat) &
1099398d6fadSStefan Brüns EXT4_FEATURE_RO_COMPAT_GDT_CSUM ? 1 : 0;
1100ed34f34dSUma Shankar
1101ed34f34dSUma Shankar if (fs->first_pass_ibmap == 0) {
1102ed34f34dSUma Shankar for (i = 0; i < fs->no_blkgrp; i++) {
1103688d0e79SStefan Brüns uint32_t free_inodes;
1104688d0e79SStefan Brüns struct ext2_block_group *bgd = NULL;
1105688d0e79SStefan Brüns bgd = ext4fs_get_group_descriptor(fs, i);
1106688d0e79SStefan Brüns free_inodes = ext4fs_bg_get_free_inodes(bgd, fs);
1107688d0e79SStefan Brüns if (free_inodes) {
1108688d0e79SStefan Brüns uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1109688d0e79SStefan Brüns uint64_t i_bitmap_blk =
1110688d0e79SStefan Brüns ext4fs_bg_get_inode_id(bgd, fs);
1111398d6fadSStefan Brüns if (has_gdt_chksum)
1112688d0e79SStefan Brüns bgd->bg_itable_unused = free_inodes;
1113688d0e79SStefan Brüns if (bg_flags & EXT4_BG_INODE_UNINIT) {
1114688d0e79SStefan Brüns put_ext4(i_bitmap_blk * fs->blksz,
1115ed34f34dSUma Shankar zero_buffer, fs->blksz);
1116688d0e79SStefan Brüns bg_flags &= ~EXT4_BG_INODE_UNINIT;
1117688d0e79SStefan Brüns ext4fs_bg_set_flags(bgd, bg_flags);
1118ed34f34dSUma Shankar memcpy(fs->inode_bmaps[i],
1119ed34f34dSUma Shankar zero_buffer, fs->blksz);
1120ed34f34dSUma Shankar }
1121ed34f34dSUma Shankar fs->curr_inode_no =
1122ed34f34dSUma Shankar _get_new_inode_no(fs->inode_bmaps[i]);
1123ed34f34dSUma Shankar if (fs->curr_inode_no == -1)
1124688d0e79SStefan Brüns /* inode bitmap is completely filled */
1125ed34f34dSUma Shankar continue;
1126ed34f34dSUma Shankar fs->curr_inode_no = fs->curr_inode_no +
1127ed34f34dSUma Shankar (i * inodes_per_grp);
1128ed34f34dSUma Shankar fs->first_pass_ibmap++;
1129749e93eeSStefan Brüns ext4fs_bg_free_inodes_dec(bgd, fs);
1130398d6fadSStefan Brüns if (has_gdt_chksum)
1131749e93eeSStefan Brüns ext4fs_bg_itable_unused_dec(bgd, fs);
113258a9ecbaSMichael Walle ext4fs_sb_free_inodes_dec(fs->sb);
1133688d0e79SStefan Brüns status = ext4fs_devread(i_bitmap_blk *
1134688d0e79SStefan Brüns fs->sect_perblk,
1135688d0e79SStefan Brüns 0, fs->blksz,
1136ed34f34dSUma Shankar journal_buffer);
1137ed34f34dSUma Shankar if (status == 0)
1138ed34f34dSUma Shankar goto fail;
1139ed34f34dSUma Shankar if (ext4fs_log_journal(journal_buffer,
1140688d0e79SStefan Brüns i_bitmap_blk))
1141ed34f34dSUma Shankar goto fail;
1142ed34f34dSUma Shankar goto success;
1143ed34f34dSUma Shankar } else
1144ed34f34dSUma Shankar debug("no inode left on block group %d\n", i);
1145ed34f34dSUma Shankar }
1146ed34f34dSUma Shankar goto fail;
1147ed34f34dSUma Shankar } else {
1148ed34f34dSUma Shankar restart:
1149ed34f34dSUma Shankar fs->curr_inode_no++;
1150ed34f34dSUma Shankar /* get the blockbitmap index respective to blockno */
1151ed34f34dSUma Shankar ibmap_idx = fs->curr_inode_no / inodes_per_grp;
1152688d0e79SStefan Brüns struct ext2_block_group *bgd =
1153688d0e79SStefan Brüns ext4fs_get_group_descriptor(fs, ibmap_idx);
1154688d0e79SStefan Brüns uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1155688d0e79SStefan Brüns uint64_t i_bitmap_blk = ext4fs_bg_get_inode_id(bgd, fs);
1156688d0e79SStefan Brüns
1157688d0e79SStefan Brüns if (bg_flags & EXT4_BG_INODE_UNINIT) {
1158688d0e79SStefan Brüns put_ext4(i_bitmap_blk * fs->blksz,
115958a9ecbaSMichael Walle zero_buffer, fs->blksz);
1160688d0e79SStefan Brüns bg_flags &= ~EXT4_BG_INODE_UNINIT;
1161688d0e79SStefan Brüns ext4fs_bg_set_flags(bgd, bg_flags);
1162ed34f34dSUma Shankar memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer,
1163ed34f34dSUma Shankar fs->blksz);
1164ed34f34dSUma Shankar }
1165ed34f34dSUma Shankar
1166ed34f34dSUma Shankar if (ext4fs_set_inode_bmap(fs->curr_inode_no,
1167ed34f34dSUma Shankar fs->inode_bmaps[ibmap_idx],
1168ed34f34dSUma Shankar ibmap_idx) != 0) {
1169ed34f34dSUma Shankar debug("going for restart for the block no %d %u\n",
1170ed34f34dSUma Shankar fs->curr_inode_no, ibmap_idx);
1171ed34f34dSUma Shankar goto restart;
1172ed34f34dSUma Shankar }
1173ed34f34dSUma Shankar
1174ed34f34dSUma Shankar /* journal backup */
1175ed34f34dSUma Shankar if (prev_inode_bitmap_index != ibmap_idx) {
1176688d0e79SStefan Brüns status = ext4fs_devread(i_bitmap_blk * fs->sect_perblk,
1177ed34f34dSUma Shankar 0, fs->blksz, journal_buffer);
1178ed34f34dSUma Shankar if (status == 0)
1179ed34f34dSUma Shankar goto fail;
1180ed34f34dSUma Shankar if (ext4fs_log_journal(journal_buffer,
1181688d0e79SStefan Brüns le32_to_cpu(bgd->inode_id)))
1182ed34f34dSUma Shankar goto fail;
1183ed34f34dSUma Shankar prev_inode_bitmap_index = ibmap_idx;
1184ed34f34dSUma Shankar }
1185749e93eeSStefan Brüns ext4fs_bg_free_inodes_dec(bgd, fs);
1186398d6fadSStefan Brüns if (has_gdt_chksum)
1187688d0e79SStefan Brüns bgd->bg_itable_unused = bgd->free_inodes;
118858a9ecbaSMichael Walle ext4fs_sb_free_inodes_dec(fs->sb);
1189ed34f34dSUma Shankar goto success;
1190ed34f34dSUma Shankar }
1191ed34f34dSUma Shankar
1192ed34f34dSUma Shankar success:
1193ed34f34dSUma Shankar free(journal_buffer);
1194ed34f34dSUma Shankar free(zero_buffer);
1195ed34f34dSUma Shankar
1196ed34f34dSUma Shankar return fs->curr_inode_no;
1197ed34f34dSUma Shankar fail:
1198ed34f34dSUma Shankar free(journal_buffer);
1199ed34f34dSUma Shankar free(zero_buffer);
1200ed34f34dSUma Shankar
1201ed34f34dSUma Shankar return -1;
1202ed34f34dSUma Shankar
1203ed34f34dSUma Shankar }
1204ed34f34dSUma Shankar
1205ed34f34dSUma Shankar
alloc_single_indirect_block(struct ext2_inode * file_inode,unsigned int * total_remaining_blocks,unsigned int * no_blks_reqd)1206ed34f34dSUma Shankar static void alloc_single_indirect_block(struct ext2_inode *file_inode,
1207ed34f34dSUma Shankar unsigned int *total_remaining_blocks,
1208ed34f34dSUma Shankar unsigned int *no_blks_reqd)
1209ed34f34dSUma Shankar {
1210ed34f34dSUma Shankar short i;
1211ed34f34dSUma Shankar short status;
1212ed34f34dSUma Shankar long int actual_block_no;
1213ed34f34dSUma Shankar long int si_blockno;
1214ed34f34dSUma Shankar /* si :single indirect */
121558a9ecbaSMichael Walle __le32 *si_buffer = NULL;
121658a9ecbaSMichael Walle __le32 *si_start_addr = NULL;
1217ed34f34dSUma Shankar struct ext_filesystem *fs = get_fs();
1218ed34f34dSUma Shankar
1219ed34f34dSUma Shankar if (*total_remaining_blocks != 0) {
1220ed34f34dSUma Shankar si_buffer = zalloc(fs->blksz);
1221ed34f34dSUma Shankar if (!si_buffer) {
1222ed34f34dSUma Shankar printf("No Memory\n");
1223ed34f34dSUma Shankar return;
1224ed34f34dSUma Shankar }
1225ed34f34dSUma Shankar si_start_addr = si_buffer;
1226ed34f34dSUma Shankar si_blockno = ext4fs_get_new_blk_no();
1227ed34f34dSUma Shankar if (si_blockno == -1) {
1228ed34f34dSUma Shankar printf("no block left to assign\n");
1229ed34f34dSUma Shankar goto fail;
1230ed34f34dSUma Shankar }
1231ed34f34dSUma Shankar (*no_blks_reqd)++;
1232ed34f34dSUma Shankar debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks);
1233ed34f34dSUma Shankar
123404735e9cSFrederic Leroy status = ext4fs_devread((lbaint_t)si_blockno * fs->sect_perblk,
1235ed34f34dSUma Shankar 0, fs->blksz, (char *)si_buffer);
1236ed34f34dSUma Shankar memset(si_buffer, '\0', fs->blksz);
1237ed34f34dSUma Shankar if (status == 0)
1238ed34f34dSUma Shankar goto fail;
1239ed34f34dSUma Shankar
1240ed34f34dSUma Shankar for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1241ed34f34dSUma Shankar actual_block_no = ext4fs_get_new_blk_no();
1242ed34f34dSUma Shankar if (actual_block_no == -1) {
1243ed34f34dSUma Shankar printf("no block left to assign\n");
1244ed34f34dSUma Shankar goto fail;
1245ed34f34dSUma Shankar }
124658a9ecbaSMichael Walle *si_buffer = cpu_to_le32(actual_block_no);
1247ed34f34dSUma Shankar debug("SIAB %u: %u\n", *si_buffer,
1248ed34f34dSUma Shankar *total_remaining_blocks);
1249ed34f34dSUma Shankar
1250ed34f34dSUma Shankar si_buffer++;
1251ed34f34dSUma Shankar (*total_remaining_blocks)--;
1252ed34f34dSUma Shankar if (*total_remaining_blocks == 0)
1253ed34f34dSUma Shankar break;
1254ed34f34dSUma Shankar }
1255ed34f34dSUma Shankar
1256ed34f34dSUma Shankar /* write the block to disk */
12570550870bSMa Haijun put_ext4(((uint64_t) ((uint64_t)si_blockno * (uint64_t)fs->blksz)),
1258ed34f34dSUma Shankar si_start_addr, fs->blksz);
125958a9ecbaSMichael Walle file_inode->b.blocks.indir_block = cpu_to_le32(si_blockno);
1260ed34f34dSUma Shankar }
1261ed34f34dSUma Shankar fail:
1262ed34f34dSUma Shankar free(si_start_addr);
1263ed34f34dSUma Shankar }
1264ed34f34dSUma Shankar
alloc_double_indirect_block(struct ext2_inode * file_inode,unsigned int * total_remaining_blocks,unsigned int * no_blks_reqd)1265ed34f34dSUma Shankar static void alloc_double_indirect_block(struct ext2_inode *file_inode,
1266ed34f34dSUma Shankar unsigned int *total_remaining_blocks,
1267ed34f34dSUma Shankar unsigned int *no_blks_reqd)
1268ed34f34dSUma Shankar {
1269ed34f34dSUma Shankar short i;
1270ed34f34dSUma Shankar short j;
1271ed34f34dSUma Shankar short status;
1272ed34f34dSUma Shankar long int actual_block_no;
1273ed34f34dSUma Shankar /* di:double indirect */
1274ed34f34dSUma Shankar long int di_blockno_parent;
1275ed34f34dSUma Shankar long int di_blockno_child;
127658a9ecbaSMichael Walle __le32 *di_parent_buffer = NULL;
127758a9ecbaSMichael Walle __le32 *di_child_buff = NULL;
127858a9ecbaSMichael Walle __le32 *di_block_start_addr = NULL;
127958a9ecbaSMichael Walle __le32 *di_child_buff_start = NULL;
1280ed34f34dSUma Shankar struct ext_filesystem *fs = get_fs();
1281ed34f34dSUma Shankar
1282ed34f34dSUma Shankar if (*total_remaining_blocks != 0) {
1283ed34f34dSUma Shankar /* double indirect parent block connecting to inode */
1284ed34f34dSUma Shankar di_blockno_parent = ext4fs_get_new_blk_no();
1285ed34f34dSUma Shankar if (di_blockno_parent == -1) {
1286ed34f34dSUma Shankar printf("no block left to assign\n");
1287ed34f34dSUma Shankar goto fail;
1288ed34f34dSUma Shankar }
1289ed34f34dSUma Shankar di_parent_buffer = zalloc(fs->blksz);
1290ed34f34dSUma Shankar if (!di_parent_buffer)
1291ed34f34dSUma Shankar goto fail;
1292ed34f34dSUma Shankar
1293ed34f34dSUma Shankar di_block_start_addr = di_parent_buffer;
1294ed34f34dSUma Shankar (*no_blks_reqd)++;
1295ed34f34dSUma Shankar debug("DIPB %ld: %u\n", di_blockno_parent,
1296ed34f34dSUma Shankar *total_remaining_blocks);
1297ed34f34dSUma Shankar
129804735e9cSFrederic Leroy status = ext4fs_devread((lbaint_t)di_blockno_parent *
1299ed34f34dSUma Shankar fs->sect_perblk, 0,
1300ed34f34dSUma Shankar fs->blksz, (char *)di_parent_buffer);
1301d429ca0dSŁukasz Majewski
1302d429ca0dSŁukasz Majewski if (!status) {
1303d429ca0dSŁukasz Majewski printf("%s: Device read error!\n", __func__);
1304d429ca0dSŁukasz Majewski goto fail;
1305d429ca0dSŁukasz Majewski }
1306ed34f34dSUma Shankar memset(di_parent_buffer, '\0', fs->blksz);
1307ed34f34dSUma Shankar
1308ed34f34dSUma Shankar /*
1309ed34f34dSUma Shankar * start:for each double indirect parent
1310ed34f34dSUma Shankar * block create one more block
1311ed34f34dSUma Shankar */
1312ed34f34dSUma Shankar for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1313ed34f34dSUma Shankar di_blockno_child = ext4fs_get_new_blk_no();
1314ed34f34dSUma Shankar if (di_blockno_child == -1) {
1315ed34f34dSUma Shankar printf("no block left to assign\n");
1316ed34f34dSUma Shankar goto fail;
1317ed34f34dSUma Shankar }
1318ed34f34dSUma Shankar di_child_buff = zalloc(fs->blksz);
1319ed34f34dSUma Shankar if (!di_child_buff)
1320ed34f34dSUma Shankar goto fail;
1321ed34f34dSUma Shankar
1322ed34f34dSUma Shankar di_child_buff_start = di_child_buff;
132358a9ecbaSMichael Walle *di_parent_buffer = cpu_to_le32(di_blockno_child);
1324ed34f34dSUma Shankar di_parent_buffer++;
1325ed34f34dSUma Shankar (*no_blks_reqd)++;
1326ed34f34dSUma Shankar debug("DICB %ld: %u\n", di_blockno_child,
1327ed34f34dSUma Shankar *total_remaining_blocks);
1328ed34f34dSUma Shankar
132904735e9cSFrederic Leroy status = ext4fs_devread((lbaint_t)di_blockno_child *
1330ed34f34dSUma Shankar fs->sect_perblk, 0,
1331ed34f34dSUma Shankar fs->blksz,
1332ed34f34dSUma Shankar (char *)di_child_buff);
1333d429ca0dSŁukasz Majewski
1334d429ca0dSŁukasz Majewski if (!status) {
1335d429ca0dSŁukasz Majewski printf("%s: Device read error!\n", __func__);
1336d429ca0dSŁukasz Majewski goto fail;
1337d429ca0dSŁukasz Majewski }
1338ed34f34dSUma Shankar memset(di_child_buff, '\0', fs->blksz);
1339ed34f34dSUma Shankar /* filling of actual datablocks for each child */
1340ed34f34dSUma Shankar for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1341ed34f34dSUma Shankar actual_block_no = ext4fs_get_new_blk_no();
1342ed34f34dSUma Shankar if (actual_block_no == -1) {
1343ed34f34dSUma Shankar printf("no block left to assign\n");
1344ed34f34dSUma Shankar goto fail;
1345ed34f34dSUma Shankar }
134658a9ecbaSMichael Walle *di_child_buff = cpu_to_le32(actual_block_no);
1347ed34f34dSUma Shankar debug("DIAB %ld: %u\n", actual_block_no,
1348ed34f34dSUma Shankar *total_remaining_blocks);
1349ed34f34dSUma Shankar
1350ed34f34dSUma Shankar di_child_buff++;
1351ed34f34dSUma Shankar (*total_remaining_blocks)--;
1352ed34f34dSUma Shankar if (*total_remaining_blocks == 0)
1353ed34f34dSUma Shankar break;
1354ed34f34dSUma Shankar }
1355ed34f34dSUma Shankar /* write the block table */
13560550870bSMa Haijun put_ext4(((uint64_t) ((uint64_t)di_blockno_child * (uint64_t)fs->blksz)),
1357ed34f34dSUma Shankar di_child_buff_start, fs->blksz);
1358ed34f34dSUma Shankar free(di_child_buff_start);
1359ed34f34dSUma Shankar di_child_buff_start = NULL;
1360ed34f34dSUma Shankar
1361ed34f34dSUma Shankar if (*total_remaining_blocks == 0)
1362ed34f34dSUma Shankar break;
1363ed34f34dSUma Shankar }
13640550870bSMa Haijun put_ext4(((uint64_t) ((uint64_t)di_blockno_parent * (uint64_t)fs->blksz)),
1365ed34f34dSUma Shankar di_block_start_addr, fs->blksz);
136658a9ecbaSMichael Walle file_inode->b.blocks.double_indir_block = cpu_to_le32(di_blockno_parent);
1367ed34f34dSUma Shankar }
1368ed34f34dSUma Shankar fail:
1369ed34f34dSUma Shankar free(di_block_start_addr);
1370ed34f34dSUma Shankar }
1371ed34f34dSUma Shankar
alloc_triple_indirect_block(struct ext2_inode * file_inode,unsigned int * total_remaining_blocks,unsigned int * no_blks_reqd)1372ed34f34dSUma Shankar static void alloc_triple_indirect_block(struct ext2_inode *file_inode,
1373ed34f34dSUma Shankar unsigned int *total_remaining_blocks,
1374ed34f34dSUma Shankar unsigned int *no_blks_reqd)
1375ed34f34dSUma Shankar {
1376ed34f34dSUma Shankar short i;
1377ed34f34dSUma Shankar short j;
1378ed34f34dSUma Shankar short k;
1379ed34f34dSUma Shankar long int actual_block_no;
1380ed34f34dSUma Shankar /* ti: Triple Indirect */
1381ed34f34dSUma Shankar long int ti_gp_blockno;
1382ed34f34dSUma Shankar long int ti_parent_blockno;
1383ed34f34dSUma Shankar long int ti_child_blockno;
138458a9ecbaSMichael Walle __le32 *ti_gp_buff = NULL;
138558a9ecbaSMichael Walle __le32 *ti_parent_buff = NULL;
138658a9ecbaSMichael Walle __le32 *ti_child_buff = NULL;
138758a9ecbaSMichael Walle __le32 *ti_gp_buff_start_addr = NULL;
138858a9ecbaSMichael Walle __le32 *ti_pbuff_start_addr = NULL;
138958a9ecbaSMichael Walle __le32 *ti_cbuff_start_addr = NULL;
1390ed34f34dSUma Shankar struct ext_filesystem *fs = get_fs();
1391ed34f34dSUma Shankar if (*total_remaining_blocks != 0) {
1392ed34f34dSUma Shankar /* triple indirect grand parent block connecting to inode */
1393ed34f34dSUma Shankar ti_gp_blockno = ext4fs_get_new_blk_no();
1394ed34f34dSUma Shankar if (ti_gp_blockno == -1) {
1395ed34f34dSUma Shankar printf("no block left to assign\n");
1396495c3a1eSTom Rini return;
1397ed34f34dSUma Shankar }
1398ed34f34dSUma Shankar ti_gp_buff = zalloc(fs->blksz);
1399ed34f34dSUma Shankar if (!ti_gp_buff)
1400495c3a1eSTom Rini return;
1401ed34f34dSUma Shankar
1402ed34f34dSUma Shankar ti_gp_buff_start_addr = ti_gp_buff;
1403ed34f34dSUma Shankar (*no_blks_reqd)++;
1404ed34f34dSUma Shankar debug("TIGPB %ld: %u\n", ti_gp_blockno,
1405ed34f34dSUma Shankar *total_remaining_blocks);
1406ed34f34dSUma Shankar
1407ed34f34dSUma Shankar /* for each 4 byte grand parent entry create one more block */
1408ed34f34dSUma Shankar for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1409ed34f34dSUma Shankar ti_parent_blockno = ext4fs_get_new_blk_no();
1410ed34f34dSUma Shankar if (ti_parent_blockno == -1) {
1411ed34f34dSUma Shankar printf("no block left to assign\n");
1412ed34f34dSUma Shankar goto fail;
1413ed34f34dSUma Shankar }
1414ed34f34dSUma Shankar ti_parent_buff = zalloc(fs->blksz);
1415ed34f34dSUma Shankar if (!ti_parent_buff)
1416ed34f34dSUma Shankar goto fail;
1417ed34f34dSUma Shankar
1418ed34f34dSUma Shankar ti_pbuff_start_addr = ti_parent_buff;
141958a9ecbaSMichael Walle *ti_gp_buff = cpu_to_le32(ti_parent_blockno);
1420ed34f34dSUma Shankar ti_gp_buff++;
1421ed34f34dSUma Shankar (*no_blks_reqd)++;
1422ed34f34dSUma Shankar debug("TIPB %ld: %u\n", ti_parent_blockno,
1423ed34f34dSUma Shankar *total_remaining_blocks);
1424ed34f34dSUma Shankar
1425ed34f34dSUma Shankar /* for each 4 byte entry parent create one more block */
1426ed34f34dSUma Shankar for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1427ed34f34dSUma Shankar ti_child_blockno = ext4fs_get_new_blk_no();
1428ed34f34dSUma Shankar if (ti_child_blockno == -1) {
1429ed34f34dSUma Shankar printf("no block left assign\n");
1430495c3a1eSTom Rini goto fail1;
1431ed34f34dSUma Shankar }
1432ed34f34dSUma Shankar ti_child_buff = zalloc(fs->blksz);
1433ed34f34dSUma Shankar if (!ti_child_buff)
1434495c3a1eSTom Rini goto fail1;
1435ed34f34dSUma Shankar
1436ed34f34dSUma Shankar ti_cbuff_start_addr = ti_child_buff;
143758a9ecbaSMichael Walle *ti_parent_buff = cpu_to_le32(ti_child_blockno);
1438ed34f34dSUma Shankar ti_parent_buff++;
1439ed34f34dSUma Shankar (*no_blks_reqd)++;
1440ed34f34dSUma Shankar debug("TICB %ld: %u\n", ti_parent_blockno,
1441ed34f34dSUma Shankar *total_remaining_blocks);
1442ed34f34dSUma Shankar
1443ed34f34dSUma Shankar /* fill actual datablocks for each child */
1444ed34f34dSUma Shankar for (k = 0; k < (fs->blksz / sizeof(int));
1445ed34f34dSUma Shankar k++) {
1446ed34f34dSUma Shankar actual_block_no =
1447ed34f34dSUma Shankar ext4fs_get_new_blk_no();
1448ed34f34dSUma Shankar if (actual_block_no == -1) {
1449ed34f34dSUma Shankar printf("no block left\n");
1450495c3a1eSTom Rini free(ti_cbuff_start_addr);
1451495c3a1eSTom Rini goto fail1;
1452ed34f34dSUma Shankar }
145358a9ecbaSMichael Walle *ti_child_buff = cpu_to_le32(actual_block_no);
1454ed34f34dSUma Shankar debug("TIAB %ld: %u\n", actual_block_no,
1455ed34f34dSUma Shankar *total_remaining_blocks);
1456ed34f34dSUma Shankar
1457ed34f34dSUma Shankar ti_child_buff++;
1458ed34f34dSUma Shankar (*total_remaining_blocks)--;
1459ed34f34dSUma Shankar if (*total_remaining_blocks == 0)
1460ed34f34dSUma Shankar break;
1461ed34f34dSUma Shankar }
1462ed34f34dSUma Shankar /* write the child block */
14630550870bSMa Haijun put_ext4(((uint64_t) ((uint64_t)ti_child_blockno *
14640550870bSMa Haijun (uint64_t)fs->blksz)),
1465ed34f34dSUma Shankar ti_cbuff_start_addr, fs->blksz);
1466ed34f34dSUma Shankar free(ti_cbuff_start_addr);
1467ed34f34dSUma Shankar
1468ed34f34dSUma Shankar if (*total_remaining_blocks == 0)
1469ed34f34dSUma Shankar break;
1470ed34f34dSUma Shankar }
1471ed34f34dSUma Shankar /* write the parent block */
14720550870bSMa Haijun put_ext4(((uint64_t) ((uint64_t)ti_parent_blockno * (uint64_t)fs->blksz)),
1473ed34f34dSUma Shankar ti_pbuff_start_addr, fs->blksz);
1474ed34f34dSUma Shankar free(ti_pbuff_start_addr);
1475ed34f34dSUma Shankar
1476ed34f34dSUma Shankar if (*total_remaining_blocks == 0)
1477ed34f34dSUma Shankar break;
1478ed34f34dSUma Shankar }
1479ed34f34dSUma Shankar /* write the grand parent block */
14800550870bSMa Haijun put_ext4(((uint64_t) ((uint64_t)ti_gp_blockno * (uint64_t)fs->blksz)),
1481ed34f34dSUma Shankar ti_gp_buff_start_addr, fs->blksz);
148258a9ecbaSMichael Walle file_inode->b.blocks.triple_indir_block = cpu_to_le32(ti_gp_blockno);
1483495c3a1eSTom Rini free(ti_gp_buff_start_addr);
1484495c3a1eSTom Rini return;
1485ed34f34dSUma Shankar }
1486495c3a1eSTom Rini fail1:
1487495c3a1eSTom Rini free(ti_pbuff_start_addr);
1488ed34f34dSUma Shankar fail:
1489ed34f34dSUma Shankar free(ti_gp_buff_start_addr);
1490ed34f34dSUma Shankar }
1491ed34f34dSUma Shankar
ext4fs_allocate_blocks(struct ext2_inode * file_inode,unsigned int total_remaining_blocks,unsigned int * total_no_of_block)1492ed34f34dSUma Shankar void ext4fs_allocate_blocks(struct ext2_inode *file_inode,
1493ed34f34dSUma Shankar unsigned int total_remaining_blocks,
1494ed34f34dSUma Shankar unsigned int *total_no_of_block)
1495ed34f34dSUma Shankar {
1496ed34f34dSUma Shankar short i;
1497ed34f34dSUma Shankar long int direct_blockno;
1498ed34f34dSUma Shankar unsigned int no_blks_reqd = 0;
1499ed34f34dSUma Shankar
1500ed34f34dSUma Shankar /* allocation of direct blocks */
1501d0180280SStephen Warren for (i = 0; total_remaining_blocks && i < INDIRECT_BLOCKS; i++) {
1502ed34f34dSUma Shankar direct_blockno = ext4fs_get_new_blk_no();
1503ed34f34dSUma Shankar if (direct_blockno == -1) {
1504ed34f34dSUma Shankar printf("no block left to assign\n");
1505ed34f34dSUma Shankar return;
1506ed34f34dSUma Shankar }
150758a9ecbaSMichael Walle file_inode->b.blocks.dir_blocks[i] = cpu_to_le32(direct_blockno);
1508ed34f34dSUma Shankar debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks);
1509ed34f34dSUma Shankar
1510ed34f34dSUma Shankar total_remaining_blocks--;
1511ed34f34dSUma Shankar }
1512ed34f34dSUma Shankar
1513ed34f34dSUma Shankar alloc_single_indirect_block(file_inode, &total_remaining_blocks,
1514ed34f34dSUma Shankar &no_blks_reqd);
1515ed34f34dSUma Shankar alloc_double_indirect_block(file_inode, &total_remaining_blocks,
1516ed34f34dSUma Shankar &no_blks_reqd);
1517ed34f34dSUma Shankar alloc_triple_indirect_block(file_inode, &total_remaining_blocks,
1518ed34f34dSUma Shankar &no_blks_reqd);
1519ed34f34dSUma Shankar *total_no_of_block += no_blks_reqd;
1520ed34f34dSUma Shankar }
1521ed34f34dSUma Shankar
1522ed34f34dSUma Shankar #endif
1523ed34f34dSUma Shankar
ext4fs_get_extent_block(struct ext2_data * data,char * buf,struct ext4_extent_header * ext_block,uint32_t fileblock,int log2_blksz)1524a1596438SUma Shankar static struct ext4_extent_header *ext4fs_get_extent_block
1525a1596438SUma Shankar (struct ext2_data *data, char *buf,
1526a1596438SUma Shankar struct ext4_extent_header *ext_block,
1527a1596438SUma Shankar uint32_t fileblock, int log2_blksz)
1528a1596438SUma Shankar {
1529a1596438SUma Shankar struct ext4_extent_idx *index;
1530a1596438SUma Shankar unsigned long long block;
153147017327SIonut Nicu int blksz = EXT2_BLOCK_SIZE(data);
1532a1596438SUma Shankar int i;
1533a1596438SUma Shankar
1534a1596438SUma Shankar while (1) {
1535a1596438SUma Shankar index = (struct ext4_extent_idx *)(ext_block + 1);
1536a1596438SUma Shankar
15378b415f70SRommel Custodio if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC)
153858a9ecbaSMichael Walle return NULL;
1539a1596438SUma Shankar
1540a1596438SUma Shankar if (ext_block->eh_depth == 0)
1541a1596438SUma Shankar return ext_block;
1542a1596438SUma Shankar i = -1;
1543a1596438SUma Shankar do {
1544a1596438SUma Shankar i++;
15458b415f70SRommel Custodio if (i >= le16_to_cpu(ext_block->eh_entries))
1546a1596438SUma Shankar break;
1547b5bbac1aSIonut Nicu } while (fileblock >= le32_to_cpu(index[i].ei_block));
1548a1596438SUma Shankar
1549a1596438SUma Shankar if (--i < 0)
155058a9ecbaSMichael Walle return NULL;
1551a1596438SUma Shankar
15528b415f70SRommel Custodio block = le16_to_cpu(index[i].ei_leaf_hi);
1553a1596438SUma Shankar block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo);
1554a1596438SUma Shankar
155547017327SIonut Nicu if (ext4fs_devread((lbaint_t)block << log2_blksz, 0, blksz,
155604735e9cSFrederic Leroy buf))
1557a1596438SUma Shankar ext_block = (struct ext4_extent_header *)buf;
1558a1596438SUma Shankar else
155958a9ecbaSMichael Walle return NULL;
1560a1596438SUma Shankar }
1561a1596438SUma Shankar }
1562a1596438SUma Shankar
ext4fs_blockgroup(struct ext2_data * data,int group,struct ext2_block_group * blkgrp)1563a1596438SUma Shankar static int ext4fs_blockgroup
1564a1596438SUma Shankar (struct ext2_data *data, int group, struct ext2_block_group *blkgrp)
1565a1596438SUma Shankar {
1566a1596438SUma Shankar long int blkno;
1567a1596438SUma Shankar unsigned int blkoff, desc_per_blk;
156850ce4c07SEgbert Eich int log2blksz = get_fs()->dev_desc->log2blksz;
1569f798b1ddSStefan Brüns int desc_size = get_fs()->gdsize;
1570a1596438SUma Shankar
1571f798b1ddSStefan Brüns desc_per_blk = EXT2_BLOCK_SIZE(data) / desc_size;
1572a1596438SUma Shankar
15737f101be3SMichael Walle blkno = le32_to_cpu(data->sblock.first_data_block) + 1 +
1574a1596438SUma Shankar group / desc_per_blk;
1575f798b1ddSStefan Brüns blkoff = (group % desc_per_blk) * desc_size;
1576a1596438SUma Shankar
1577a1596438SUma Shankar debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n",
1578a1596438SUma Shankar group, blkno, blkoff);
1579a1596438SUma Shankar
158004735e9cSFrederic Leroy return ext4fs_devread((lbaint_t)blkno <<
158104735e9cSFrederic Leroy (LOG2_BLOCK_SIZE(data) - log2blksz),
1582f798b1ddSStefan Brüns blkoff, desc_size, (char *)blkgrp);
1583a1596438SUma Shankar }
1584a1596438SUma Shankar
ext4fs_read_inode(struct ext2_data * data,int ino,struct ext2_inode * inode)1585a1596438SUma Shankar int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode)
1586a1596438SUma Shankar {
1587a1596438SUma Shankar struct ext2_block_group blkgrp;
1588a1596438SUma Shankar struct ext2_sblock *sblock = &data->sblock;
1589a1596438SUma Shankar struct ext_filesystem *fs = get_fs();
159050ce4c07SEgbert Eich int log2blksz = get_fs()->dev_desc->log2blksz;
1591a1596438SUma Shankar int inodes_per_block, status;
1592a1596438SUma Shankar long int blkno;
1593a1596438SUma Shankar unsigned int blkoff;
1594a1596438SUma Shankar
1595a1596438SUma Shankar /* It is easier to calculate if the first inode is 0. */
1596a1596438SUma Shankar ino--;
15977f101be3SMichael Walle status = ext4fs_blockgroup(data, ino / le32_to_cpu
1598a1596438SUma Shankar (sblock->inodes_per_group), &blkgrp);
1599a1596438SUma Shankar if (status == 0)
1600a1596438SUma Shankar return 0;
1601a1596438SUma Shankar
1602a1596438SUma Shankar inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz;
1603688d0e79SStefan Brüns blkno = ext4fs_bg_get_inode_table_id(&blkgrp, fs) +
16047f101be3SMichael Walle (ino % le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
1605a1596438SUma Shankar blkoff = (ino % inodes_per_block) * fs->inodesz;
1606a1596438SUma Shankar /* Read the inode. */
160704735e9cSFrederic Leroy status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) -
160804735e9cSFrederic Leroy log2blksz), blkoff,
1609a1596438SUma Shankar sizeof(struct ext2_inode), (char *)inode);
1610a1596438SUma Shankar if (status == 0)
1611a1596438SUma Shankar return 0;
1612a1596438SUma Shankar
1613a1596438SUma Shankar return 1;
1614a1596438SUma Shankar }
1615a1596438SUma Shankar
read_allocated_block(struct ext2_inode * inode,int fileblock)1616a1596438SUma Shankar long int read_allocated_block(struct ext2_inode *inode, int fileblock)
1617a1596438SUma Shankar {
1618a1596438SUma Shankar long int blknr;
1619a1596438SUma Shankar int blksz;
1620a1596438SUma Shankar int log2_blksz;
1621a1596438SUma Shankar int status;
1622a1596438SUma Shankar long int rblock;
1623a1596438SUma Shankar long int perblock_parent;
1624a1596438SUma Shankar long int perblock_child;
1625a1596438SUma Shankar unsigned long long start;
1626a1596438SUma Shankar /* get the blocksize of the filesystem */
1627a1596438SUma Shankar blksz = EXT2_BLOCK_SIZE(ext4fs_root);
162850ce4c07SEgbert Eich log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root)
162950ce4c07SEgbert Eich - get_fs()->dev_desc->log2blksz;
163050ce4c07SEgbert Eich
1631a1596438SUma Shankar if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) {
1632f81db56fSStefan Brüns long int startblock, endblock;
1633a1596438SUma Shankar char *buf = zalloc(blksz);
1634a1596438SUma Shankar if (!buf)
1635a1596438SUma Shankar return -ENOMEM;
1636a1596438SUma Shankar struct ext4_extent_header *ext_block;
1637a1596438SUma Shankar struct ext4_extent *extent;
1638f81db56fSStefan Brüns int i;
163950ce4c07SEgbert Eich ext_block =
164050ce4c07SEgbert Eich ext4fs_get_extent_block(ext4fs_root, buf,
164150ce4c07SEgbert Eich (struct ext4_extent_header *)
164250ce4c07SEgbert Eich inode->b.blocks.dir_blocks,
1643a1596438SUma Shankar fileblock, log2_blksz);
1644a1596438SUma Shankar if (!ext_block) {
1645a1596438SUma Shankar printf("invalid extent block\n");
1646a1596438SUma Shankar free(buf);
1647a1596438SUma Shankar return -EINVAL;
1648a1596438SUma Shankar }
1649a1596438SUma Shankar
1650a1596438SUma Shankar extent = (struct ext4_extent *)(ext_block + 1);
1651a1596438SUma Shankar
1652f81db56fSStefan Brüns for (i = 0; i < le16_to_cpu(ext_block->eh_entries); i++) {
1653f81db56fSStefan Brüns startblock = le32_to_cpu(extent[i].ee_block);
1654f81db56fSStefan Brüns endblock = startblock + le16_to_cpu(extent[i].ee_len);
1655f81db56fSStefan Brüns
1656f81db56fSStefan Brüns if (startblock > fileblock) {
1657f81db56fSStefan Brüns /* Sparse file */
1658a1596438SUma Shankar free(buf);
1659a1596438SUma Shankar return 0;
1660a1596438SUma Shankar
1661f81db56fSStefan Brüns } else if (fileblock < endblock) {
16628b415f70SRommel Custodio start = le16_to_cpu(extent[i].ee_start_hi);
1663a1596438SUma Shankar start = (start << 32) +
1664a1596438SUma Shankar le32_to_cpu(extent[i].ee_start_lo);
1665a1596438SUma Shankar free(buf);
1666f81db56fSStefan Brüns return (fileblock - startblock) + start;
1667f81db56fSStefan Brüns }
1668a1596438SUma Shankar }
1669a1596438SUma Shankar
1670a1596438SUma Shankar free(buf);
1671f81db56fSStefan Brüns return 0;
1672a1596438SUma Shankar }
1673a1596438SUma Shankar
1674a1596438SUma Shankar /* Direct blocks. */
1675a1596438SUma Shankar if (fileblock < INDIRECT_BLOCKS)
16767f101be3SMichael Walle blknr = le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]);
1677a1596438SUma Shankar
1678a1596438SUma Shankar /* Indirect. */
1679a1596438SUma Shankar else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) {
1680a1596438SUma Shankar if (ext4fs_indir1_block == NULL) {
1681a1596438SUma Shankar ext4fs_indir1_block = zalloc(blksz);
1682a1596438SUma Shankar if (ext4fs_indir1_block == NULL) {
1683a1596438SUma Shankar printf("** SI ext2fs read block (indir 1)"
1684a1596438SUma Shankar "malloc failed. **\n");
1685a1596438SUma Shankar return -1;
1686a1596438SUma Shankar }
1687a1596438SUma Shankar ext4fs_indir1_size = blksz;
1688a1596438SUma Shankar ext4fs_indir1_blkno = -1;
1689a1596438SUma Shankar }
1690a1596438SUma Shankar if (blksz != ext4fs_indir1_size) {
1691a1596438SUma Shankar free(ext4fs_indir1_block);
1692a1596438SUma Shankar ext4fs_indir1_block = NULL;
1693a1596438SUma Shankar ext4fs_indir1_size = 0;
1694a1596438SUma Shankar ext4fs_indir1_blkno = -1;
1695a1596438SUma Shankar ext4fs_indir1_block = zalloc(blksz);
1696a1596438SUma Shankar if (ext4fs_indir1_block == NULL) {
1697a1596438SUma Shankar printf("** SI ext2fs read block (indir 1):"
1698a1596438SUma Shankar "malloc failed. **\n");
1699a1596438SUma Shankar return -1;
1700a1596438SUma Shankar }
1701a1596438SUma Shankar ext4fs_indir1_size = blksz;
1702a1596438SUma Shankar }
17037f101be3SMichael Walle if ((le32_to_cpu(inode->b.blocks.indir_block) <<
1704a1596438SUma Shankar log2_blksz) != ext4fs_indir1_blkno) {
1705a1596438SUma Shankar status =
17067f101be3SMichael Walle ext4fs_devread((lbaint_t)le32_to_cpu
1707a1596438SUma Shankar (inode->b.blocks.
1708a1596438SUma Shankar indir_block) << log2_blksz, 0,
1709a1596438SUma Shankar blksz, (char *)ext4fs_indir1_block);
1710a1596438SUma Shankar if (status == 0) {
1711a1596438SUma Shankar printf("** SI ext2fs read block (indir 1)"
1712a1596438SUma Shankar "failed. **\n");
1713de9e8316SStefan Brüns return -1;
1714a1596438SUma Shankar }
1715a1596438SUma Shankar ext4fs_indir1_blkno =
17167f101be3SMichael Walle le32_to_cpu(inode->b.blocks.
1717a1596438SUma Shankar indir_block) << log2_blksz;
1718a1596438SUma Shankar }
17197f101be3SMichael Walle blknr = le32_to_cpu(ext4fs_indir1_block
1720a1596438SUma Shankar [fileblock - INDIRECT_BLOCKS]);
1721a1596438SUma Shankar }
1722a1596438SUma Shankar /* Double indirect. */
1723a1596438SUma Shankar else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 *
1724a1596438SUma Shankar (blksz / 4 + 1)))) {
1725a1596438SUma Shankar
1726a1596438SUma Shankar long int perblock = blksz / 4;
1727a1596438SUma Shankar long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4);
1728a1596438SUma Shankar
1729a1596438SUma Shankar if (ext4fs_indir1_block == NULL) {
1730a1596438SUma Shankar ext4fs_indir1_block = zalloc(blksz);
1731a1596438SUma Shankar if (ext4fs_indir1_block == NULL) {
1732a1596438SUma Shankar printf("** DI ext2fs read block (indir 2 1)"
1733a1596438SUma Shankar "malloc failed. **\n");
1734a1596438SUma Shankar return -1;
1735a1596438SUma Shankar }
1736a1596438SUma Shankar ext4fs_indir1_size = blksz;
1737a1596438SUma Shankar ext4fs_indir1_blkno = -1;
1738a1596438SUma Shankar }
1739a1596438SUma Shankar if (blksz != ext4fs_indir1_size) {
1740a1596438SUma Shankar free(ext4fs_indir1_block);
1741a1596438SUma Shankar ext4fs_indir1_block = NULL;
1742a1596438SUma Shankar ext4fs_indir1_size = 0;
1743a1596438SUma Shankar ext4fs_indir1_blkno = -1;
1744a1596438SUma Shankar ext4fs_indir1_block = zalloc(blksz);
1745a1596438SUma Shankar if (ext4fs_indir1_block == NULL) {
1746a1596438SUma Shankar printf("** DI ext2fs read block (indir 2 1)"
1747a1596438SUma Shankar "malloc failed. **\n");
1748a1596438SUma Shankar return -1;
1749a1596438SUma Shankar }
1750a1596438SUma Shankar ext4fs_indir1_size = blksz;
1751a1596438SUma Shankar }
17527f101be3SMichael Walle if ((le32_to_cpu(inode->b.blocks.double_indir_block) <<
1753a1596438SUma Shankar log2_blksz) != ext4fs_indir1_blkno) {
1754a1596438SUma Shankar status =
17557f101be3SMichael Walle ext4fs_devread((lbaint_t)le32_to_cpu
1756a1596438SUma Shankar (inode->b.blocks.
1757a1596438SUma Shankar double_indir_block) << log2_blksz,
1758a1596438SUma Shankar 0, blksz,
1759a1596438SUma Shankar (char *)ext4fs_indir1_block);
1760a1596438SUma Shankar if (status == 0) {
1761a1596438SUma Shankar printf("** DI ext2fs read block (indir 2 1)"
1762a1596438SUma Shankar "failed. **\n");
1763a1596438SUma Shankar return -1;
1764a1596438SUma Shankar }
1765a1596438SUma Shankar ext4fs_indir1_blkno =
17667f101be3SMichael Walle le32_to_cpu(inode->b.blocks.double_indir_block) <<
1767a1596438SUma Shankar log2_blksz;
1768a1596438SUma Shankar }
1769a1596438SUma Shankar
1770a1596438SUma Shankar if (ext4fs_indir2_block == NULL) {
1771a1596438SUma Shankar ext4fs_indir2_block = zalloc(blksz);
1772a1596438SUma Shankar if (ext4fs_indir2_block == NULL) {
1773a1596438SUma Shankar printf("** DI ext2fs read block (indir 2 2)"
1774a1596438SUma Shankar "malloc failed. **\n");
1775a1596438SUma Shankar return -1;
1776a1596438SUma Shankar }
1777a1596438SUma Shankar ext4fs_indir2_size = blksz;
1778a1596438SUma Shankar ext4fs_indir2_blkno = -1;
1779a1596438SUma Shankar }
1780a1596438SUma Shankar if (blksz != ext4fs_indir2_size) {
1781a1596438SUma Shankar free(ext4fs_indir2_block);
1782a1596438SUma Shankar ext4fs_indir2_block = NULL;
1783a1596438SUma Shankar ext4fs_indir2_size = 0;
1784a1596438SUma Shankar ext4fs_indir2_blkno = -1;
1785a1596438SUma Shankar ext4fs_indir2_block = zalloc(blksz);
1786a1596438SUma Shankar if (ext4fs_indir2_block == NULL) {
1787a1596438SUma Shankar printf("** DI ext2fs read block (indir 2 2)"
1788a1596438SUma Shankar "malloc failed. **\n");
1789a1596438SUma Shankar return -1;
1790a1596438SUma Shankar }
1791a1596438SUma Shankar ext4fs_indir2_size = blksz;
1792a1596438SUma Shankar }
17937f101be3SMichael Walle if ((le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) <<
1794a1596438SUma Shankar log2_blksz) != ext4fs_indir2_blkno) {
17957f101be3SMichael Walle status = ext4fs_devread((lbaint_t)le32_to_cpu
1796a1596438SUma Shankar (ext4fs_indir1_block
1797a1596438SUma Shankar [rblock /
1798a1596438SUma Shankar perblock]) << log2_blksz, 0,
1799a1596438SUma Shankar blksz,
1800a1596438SUma Shankar (char *)ext4fs_indir2_block);
1801a1596438SUma Shankar if (status == 0) {
1802a1596438SUma Shankar printf("** DI ext2fs read block (indir 2 2)"
1803a1596438SUma Shankar "failed. **\n");
1804a1596438SUma Shankar return -1;
1805a1596438SUma Shankar }
1806a1596438SUma Shankar ext4fs_indir2_blkno =
18077f101be3SMichael Walle le32_to_cpu(ext4fs_indir1_block[rblock
1808a1596438SUma Shankar /
1809a1596438SUma Shankar perblock]) <<
1810a1596438SUma Shankar log2_blksz;
1811a1596438SUma Shankar }
18127f101be3SMichael Walle blknr = le32_to_cpu(ext4fs_indir2_block[rblock % perblock]);
1813a1596438SUma Shankar }
1814a1596438SUma Shankar /* Tripple indirect. */
1815a1596438SUma Shankar else {
1816a1596438SUma Shankar rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 +
1817a1596438SUma Shankar (blksz / 4 * blksz / 4));
1818a1596438SUma Shankar perblock_child = blksz / 4;
1819a1596438SUma Shankar perblock_parent = ((blksz / 4) * (blksz / 4));
1820a1596438SUma Shankar
1821a1596438SUma Shankar if (ext4fs_indir1_block == NULL) {
1822a1596438SUma Shankar ext4fs_indir1_block = zalloc(blksz);
1823a1596438SUma Shankar if (ext4fs_indir1_block == NULL) {
1824a1596438SUma Shankar printf("** TI ext2fs read block (indir 2 1)"
1825a1596438SUma Shankar "malloc failed. **\n");
1826a1596438SUma Shankar return -1;
1827a1596438SUma Shankar }
1828a1596438SUma Shankar ext4fs_indir1_size = blksz;
1829a1596438SUma Shankar ext4fs_indir1_blkno = -1;
1830a1596438SUma Shankar }
1831a1596438SUma Shankar if (blksz != ext4fs_indir1_size) {
1832a1596438SUma Shankar free(ext4fs_indir1_block);
1833a1596438SUma Shankar ext4fs_indir1_block = NULL;
1834a1596438SUma Shankar ext4fs_indir1_size = 0;
1835a1596438SUma Shankar ext4fs_indir1_blkno = -1;
1836a1596438SUma Shankar ext4fs_indir1_block = zalloc(blksz);
1837a1596438SUma Shankar if (ext4fs_indir1_block == NULL) {
1838a1596438SUma Shankar printf("** TI ext2fs read block (indir 2 1)"
1839a1596438SUma Shankar "malloc failed. **\n");
1840a1596438SUma Shankar return -1;
1841a1596438SUma Shankar }
1842a1596438SUma Shankar ext4fs_indir1_size = blksz;
1843a1596438SUma Shankar }
18447f101be3SMichael Walle if ((le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1845a1596438SUma Shankar log2_blksz) != ext4fs_indir1_blkno) {
1846a1596438SUma Shankar status = ext4fs_devread
184704735e9cSFrederic Leroy ((lbaint_t)
18487f101be3SMichael Walle le32_to_cpu(inode->b.blocks.triple_indir_block)
1849a1596438SUma Shankar << log2_blksz, 0, blksz,
1850a1596438SUma Shankar (char *)ext4fs_indir1_block);
1851a1596438SUma Shankar if (status == 0) {
1852a1596438SUma Shankar printf("** TI ext2fs read block (indir 2 1)"
1853a1596438SUma Shankar "failed. **\n");
1854a1596438SUma Shankar return -1;
1855a1596438SUma Shankar }
1856a1596438SUma Shankar ext4fs_indir1_blkno =
18577f101be3SMichael Walle le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1858a1596438SUma Shankar log2_blksz;
1859a1596438SUma Shankar }
1860a1596438SUma Shankar
1861a1596438SUma Shankar if (ext4fs_indir2_block == NULL) {
1862a1596438SUma Shankar ext4fs_indir2_block = zalloc(blksz);
1863a1596438SUma Shankar if (ext4fs_indir2_block == NULL) {
1864a1596438SUma Shankar printf("** TI ext2fs read block (indir 2 2)"
1865a1596438SUma Shankar "malloc failed. **\n");
1866a1596438SUma Shankar return -1;
1867a1596438SUma Shankar }
1868a1596438SUma Shankar ext4fs_indir2_size = blksz;
1869a1596438SUma Shankar ext4fs_indir2_blkno = -1;
1870a1596438SUma Shankar }
1871a1596438SUma Shankar if (blksz != ext4fs_indir2_size) {
1872a1596438SUma Shankar free(ext4fs_indir2_block);
1873a1596438SUma Shankar ext4fs_indir2_block = NULL;
1874a1596438SUma Shankar ext4fs_indir2_size = 0;
1875a1596438SUma Shankar ext4fs_indir2_blkno = -1;
1876a1596438SUma Shankar ext4fs_indir2_block = zalloc(blksz);
1877a1596438SUma Shankar if (ext4fs_indir2_block == NULL) {
1878a1596438SUma Shankar printf("** TI ext2fs read block (indir 2 2)"
1879a1596438SUma Shankar "malloc failed. **\n");
1880a1596438SUma Shankar return -1;
1881a1596438SUma Shankar }
1882a1596438SUma Shankar ext4fs_indir2_size = blksz;
1883a1596438SUma Shankar }
18847f101be3SMichael Walle if ((le32_to_cpu(ext4fs_indir1_block[rblock /
1885a1596438SUma Shankar perblock_parent]) <<
1886a1596438SUma Shankar log2_blksz)
1887a1596438SUma Shankar != ext4fs_indir2_blkno) {
18887f101be3SMichael Walle status = ext4fs_devread((lbaint_t)le32_to_cpu
1889a1596438SUma Shankar (ext4fs_indir1_block
1890a1596438SUma Shankar [rblock /
1891a1596438SUma Shankar perblock_parent]) <<
1892a1596438SUma Shankar log2_blksz, 0, blksz,
1893a1596438SUma Shankar (char *)ext4fs_indir2_block);
1894a1596438SUma Shankar if (status == 0) {
1895a1596438SUma Shankar printf("** TI ext2fs read block (indir 2 2)"
1896a1596438SUma Shankar "failed. **\n");
1897a1596438SUma Shankar return -1;
1898a1596438SUma Shankar }
1899a1596438SUma Shankar ext4fs_indir2_blkno =
19007f101be3SMichael Walle le32_to_cpu(ext4fs_indir1_block[rblock /
1901a1596438SUma Shankar perblock_parent])
1902a1596438SUma Shankar << log2_blksz;
1903a1596438SUma Shankar }
1904a1596438SUma Shankar
1905a1596438SUma Shankar if (ext4fs_indir3_block == NULL) {
1906a1596438SUma Shankar ext4fs_indir3_block = zalloc(blksz);
1907a1596438SUma Shankar if (ext4fs_indir3_block == NULL) {
1908a1596438SUma Shankar printf("** TI ext2fs read block (indir 2 2)"
1909a1596438SUma Shankar "malloc failed. **\n");
1910a1596438SUma Shankar return -1;
1911a1596438SUma Shankar }
1912a1596438SUma Shankar ext4fs_indir3_size = blksz;
1913a1596438SUma Shankar ext4fs_indir3_blkno = -1;
1914a1596438SUma Shankar }
1915a1596438SUma Shankar if (blksz != ext4fs_indir3_size) {
1916a1596438SUma Shankar free(ext4fs_indir3_block);
1917a1596438SUma Shankar ext4fs_indir3_block = NULL;
1918a1596438SUma Shankar ext4fs_indir3_size = 0;
1919a1596438SUma Shankar ext4fs_indir3_blkno = -1;
1920a1596438SUma Shankar ext4fs_indir3_block = zalloc(blksz);
1921a1596438SUma Shankar if (ext4fs_indir3_block == NULL) {
1922a1596438SUma Shankar printf("** TI ext2fs read block (indir 2 2)"
1923a1596438SUma Shankar "malloc failed. **\n");
1924a1596438SUma Shankar return -1;
1925a1596438SUma Shankar }
1926a1596438SUma Shankar ext4fs_indir3_size = blksz;
1927a1596438SUma Shankar }
19287f101be3SMichael Walle if ((le32_to_cpu(ext4fs_indir2_block[rblock
1929a1596438SUma Shankar /
1930a1596438SUma Shankar perblock_child]) <<
1931a1596438SUma Shankar log2_blksz) != ext4fs_indir3_blkno) {
1932a1596438SUma Shankar status =
19337f101be3SMichael Walle ext4fs_devread((lbaint_t)le32_to_cpu
1934a1596438SUma Shankar (ext4fs_indir2_block
1935a1596438SUma Shankar [(rblock / perblock_child)
1936a1596438SUma Shankar % (blksz / 4)]) << log2_blksz, 0,
1937a1596438SUma Shankar blksz, (char *)ext4fs_indir3_block);
1938a1596438SUma Shankar if (status == 0) {
1939a1596438SUma Shankar printf("** TI ext2fs read block (indir 2 2)"
1940a1596438SUma Shankar "failed. **\n");
1941a1596438SUma Shankar return -1;
1942a1596438SUma Shankar }
1943a1596438SUma Shankar ext4fs_indir3_blkno =
19447f101be3SMichael Walle le32_to_cpu(ext4fs_indir2_block[(rblock /
1945a1596438SUma Shankar perblock_child) %
1946a1596438SUma Shankar (blksz /
1947a1596438SUma Shankar 4)]) <<
1948a1596438SUma Shankar log2_blksz;
1949a1596438SUma Shankar }
1950a1596438SUma Shankar
19517f101be3SMichael Walle blknr = le32_to_cpu(ext4fs_indir3_block
1952a1596438SUma Shankar [rblock % perblock_child]);
1953a1596438SUma Shankar }
195450ce4c07SEgbert Eich debug("read_allocated_block %ld\n", blknr);
1955a1596438SUma Shankar
1956a1596438SUma Shankar return blknr;
1957a1596438SUma Shankar }
1958a1596438SUma Shankar
19598b454eeeSŁukasz Majewski /**
19608b454eeeSŁukasz Majewski * ext4fs_reinit_global() - Reinitialize values of ext4 write implementation's
19618b454eeeSŁukasz Majewski * global pointers
19628b454eeeSŁukasz Majewski *
19638b454eeeSŁukasz Majewski * This function assures that for a file with the same name but different size
19648b454eeeSŁukasz Majewski * the sequential store on the ext4 filesystem will be correct.
19658b454eeeSŁukasz Majewski *
19668b454eeeSŁukasz Majewski * In this function the global data, responsible for internal representation
19678b454eeeSŁukasz Majewski * of the ext4 data are initialized to the reset state. Without this, during
19688b454eeeSŁukasz Majewski * replacement of the smaller file with the bigger truncation of new file was
19698b454eeeSŁukasz Majewski * performed.
19708b454eeeSŁukasz Majewski */
ext4fs_reinit_global(void)19718b454eeeSŁukasz Majewski void ext4fs_reinit_global(void)
1972a1596438SUma Shankar {
1973a1596438SUma Shankar if (ext4fs_indir1_block != NULL) {
1974a1596438SUma Shankar free(ext4fs_indir1_block);
1975a1596438SUma Shankar ext4fs_indir1_block = NULL;
1976a1596438SUma Shankar ext4fs_indir1_size = 0;
1977a1596438SUma Shankar ext4fs_indir1_blkno = -1;
1978a1596438SUma Shankar }
1979a1596438SUma Shankar if (ext4fs_indir2_block != NULL) {
1980a1596438SUma Shankar free(ext4fs_indir2_block);
1981a1596438SUma Shankar ext4fs_indir2_block = NULL;
1982a1596438SUma Shankar ext4fs_indir2_size = 0;
1983a1596438SUma Shankar ext4fs_indir2_blkno = -1;
1984a1596438SUma Shankar }
1985a1596438SUma Shankar if (ext4fs_indir3_block != NULL) {
1986a1596438SUma Shankar free(ext4fs_indir3_block);
1987a1596438SUma Shankar ext4fs_indir3_block = NULL;
1988a1596438SUma Shankar ext4fs_indir3_size = 0;
1989a1596438SUma Shankar ext4fs_indir3_blkno = -1;
1990a1596438SUma Shankar }
1991a1596438SUma Shankar }
ext4fs_close(void)19928b454eeeSŁukasz Majewski void ext4fs_close(void)
19938b454eeeSŁukasz Majewski {
19948b454eeeSŁukasz Majewski if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) {
19958b454eeeSŁukasz Majewski ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen);
19968b454eeeSŁukasz Majewski ext4fs_file = NULL;
19978b454eeeSŁukasz Majewski }
19988b454eeeSŁukasz Majewski if (ext4fs_root != NULL) {
19998b454eeeSŁukasz Majewski free(ext4fs_root);
20008b454eeeSŁukasz Majewski ext4fs_root = NULL;
20018b454eeeSŁukasz Majewski }
20028b454eeeSŁukasz Majewski
20038b454eeeSŁukasz Majewski ext4fs_reinit_global();
20048b454eeeSŁukasz Majewski }
2005a1596438SUma Shankar
ext4fs_iterate_dir(struct ext2fs_node * dir,char * name,struct ext2fs_node ** fnode,int * ftype)2006a1596438SUma Shankar int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name,
2007a1596438SUma Shankar struct ext2fs_node **fnode, int *ftype)
2008a1596438SUma Shankar {
2009a1596438SUma Shankar unsigned int fpos = 0;
2010a1596438SUma Shankar int status;
20119f12cd0eSSuriyan Ramasami loff_t actread;
2012a1596438SUma Shankar struct ext2fs_node *diro = (struct ext2fs_node *) dir;
2013a1596438SUma Shankar
2014a1596438SUma Shankar #ifdef DEBUG
2015a1596438SUma Shankar if (name != NULL)
2016a1596438SUma Shankar printf("Iterate dir %s\n", name);
2017a1596438SUma Shankar #endif /* of DEBUG */
2018a1596438SUma Shankar if (!diro->inode_read) {
2019a1596438SUma Shankar status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2020a1596438SUma Shankar if (status == 0)
2021a1596438SUma Shankar return 0;
2022a1596438SUma Shankar }
2023a1596438SUma Shankar /* Search the file. */
20247f101be3SMichael Walle while (fpos < le32_to_cpu(diro->inode.size)) {
2025a1596438SUma Shankar struct ext2_dirent dirent;
2026a1596438SUma Shankar
2027a1596438SUma Shankar status = ext4fs_read_file(diro, fpos,
2028a1596438SUma Shankar sizeof(struct ext2_dirent),
20299f12cd0eSSuriyan Ramasami (char *)&dirent, &actread);
20309f12cd0eSSuriyan Ramasami if (status < 0)
2031a1596438SUma Shankar return 0;
2032a1596438SUma Shankar
203354d68e93SThomas Fitzsimmons if (dirent.direntlen == 0) {
203454d68e93SThomas Fitzsimmons printf("Failed to iterate over directory %s\n", name);
203554d68e93SThomas Fitzsimmons return 0;
203654d68e93SThomas Fitzsimmons }
203754d68e93SThomas Fitzsimmons
2038a1596438SUma Shankar if (dirent.namelen != 0) {
2039a1596438SUma Shankar char filename[dirent.namelen + 1];
2040a1596438SUma Shankar struct ext2fs_node *fdiro;
2041a1596438SUma Shankar int type = FILETYPE_UNKNOWN;
2042a1596438SUma Shankar
2043a1596438SUma Shankar status = ext4fs_read_file(diro,
2044a1596438SUma Shankar fpos +
2045a1596438SUma Shankar sizeof(struct ext2_dirent),
20469f12cd0eSSuriyan Ramasami dirent.namelen, filename,
20479f12cd0eSSuriyan Ramasami &actread);
20489f12cd0eSSuriyan Ramasami if (status < 0)
2049a1596438SUma Shankar return 0;
2050a1596438SUma Shankar
2051a1596438SUma Shankar fdiro = zalloc(sizeof(struct ext2fs_node));
2052a1596438SUma Shankar if (!fdiro)
2053a1596438SUma Shankar return 0;
2054a1596438SUma Shankar
2055a1596438SUma Shankar fdiro->data = diro->data;
20567f101be3SMichael Walle fdiro->ino = le32_to_cpu(dirent.inode);
2057a1596438SUma Shankar
2058a1596438SUma Shankar filename[dirent.namelen] = '\0';
2059a1596438SUma Shankar
2060a1596438SUma Shankar if (dirent.filetype != FILETYPE_UNKNOWN) {
2061a1596438SUma Shankar fdiro->inode_read = 0;
2062a1596438SUma Shankar
2063a1596438SUma Shankar if (dirent.filetype == FILETYPE_DIRECTORY)
2064a1596438SUma Shankar type = FILETYPE_DIRECTORY;
2065a1596438SUma Shankar else if (dirent.filetype == FILETYPE_SYMLINK)
2066a1596438SUma Shankar type = FILETYPE_SYMLINK;
2067a1596438SUma Shankar else if (dirent.filetype == FILETYPE_REG)
2068a1596438SUma Shankar type = FILETYPE_REG;
2069a1596438SUma Shankar } else {
2070a1596438SUma Shankar status = ext4fs_read_inode(diro->data,
20717f101be3SMichael Walle le32_to_cpu
2072a1596438SUma Shankar (dirent.inode),
2073a1596438SUma Shankar &fdiro->inode);
2074a1596438SUma Shankar if (status == 0) {
2075a1596438SUma Shankar free(fdiro);
2076a1596438SUma Shankar return 0;
2077a1596438SUma Shankar }
2078a1596438SUma Shankar fdiro->inode_read = 1;
2079a1596438SUma Shankar
20807f101be3SMichael Walle if ((le16_to_cpu(fdiro->inode.mode) &
2081a1596438SUma Shankar FILETYPE_INO_MASK) ==
2082a1596438SUma Shankar FILETYPE_INO_DIRECTORY) {
2083a1596438SUma Shankar type = FILETYPE_DIRECTORY;
20847f101be3SMichael Walle } else if ((le16_to_cpu(fdiro->inode.mode)
2085a1596438SUma Shankar & FILETYPE_INO_MASK) ==
2086a1596438SUma Shankar FILETYPE_INO_SYMLINK) {
2087a1596438SUma Shankar type = FILETYPE_SYMLINK;
20887f101be3SMichael Walle } else if ((le16_to_cpu(fdiro->inode.mode)
2089a1596438SUma Shankar & FILETYPE_INO_MASK) ==
2090a1596438SUma Shankar FILETYPE_INO_REG) {
2091a1596438SUma Shankar type = FILETYPE_REG;
2092a1596438SUma Shankar }
2093a1596438SUma Shankar }
2094a1596438SUma Shankar #ifdef DEBUG
2095a1596438SUma Shankar printf("iterate >%s<\n", filename);
2096a1596438SUma Shankar #endif /* of DEBUG */
2097a1596438SUma Shankar if ((name != NULL) && (fnode != NULL)
2098a1596438SUma Shankar && (ftype != NULL)) {
2099a1596438SUma Shankar if (strcmp(filename, name) == 0) {
2100a1596438SUma Shankar *ftype = type;
2101a1596438SUma Shankar *fnode = fdiro;
2102a1596438SUma Shankar return 1;
2103a1596438SUma Shankar }
2104a1596438SUma Shankar } else {
2105a1596438SUma Shankar if (fdiro->inode_read == 0) {
2106a1596438SUma Shankar status = ext4fs_read_inode(diro->data,
21077f101be3SMichael Walle le32_to_cpu(
2108a1596438SUma Shankar dirent.inode),
2109a1596438SUma Shankar &fdiro->inode);
2110a1596438SUma Shankar if (status == 0) {
2111a1596438SUma Shankar free(fdiro);
2112a1596438SUma Shankar return 0;
2113a1596438SUma Shankar }
2114a1596438SUma Shankar fdiro->inode_read = 1;
2115a1596438SUma Shankar }
2116a1596438SUma Shankar switch (type) {
2117a1596438SUma Shankar case FILETYPE_DIRECTORY:
2118a1596438SUma Shankar printf("<DIR> ");
2119a1596438SUma Shankar break;
2120a1596438SUma Shankar case FILETYPE_SYMLINK:
2121a1596438SUma Shankar printf("<SYM> ");
2122a1596438SUma Shankar break;
2123a1596438SUma Shankar case FILETYPE_REG:
2124a1596438SUma Shankar printf(" ");
2125a1596438SUma Shankar break;
2126a1596438SUma Shankar default:
2127a1596438SUma Shankar printf("< ? > ");
2128a1596438SUma Shankar break;
2129a1596438SUma Shankar }
21309f12cd0eSSuriyan Ramasami printf("%10u %s\n",
21317f101be3SMichael Walle le32_to_cpu(fdiro->inode.size),
2132a1596438SUma Shankar filename);
2133a1596438SUma Shankar }
2134a1596438SUma Shankar free(fdiro);
2135a1596438SUma Shankar }
21367f101be3SMichael Walle fpos += le16_to_cpu(dirent.direntlen);
2137a1596438SUma Shankar }
2138a1596438SUma Shankar return 0;
2139a1596438SUma Shankar }
2140a1596438SUma Shankar
ext4fs_read_symlink(struct ext2fs_node * node)2141a1596438SUma Shankar static char *ext4fs_read_symlink(struct ext2fs_node *node)
2142a1596438SUma Shankar {
2143a1596438SUma Shankar char *symlink;
2144a1596438SUma Shankar struct ext2fs_node *diro = node;
2145a1596438SUma Shankar int status;
21469f12cd0eSSuriyan Ramasami loff_t actread;
2147a1596438SUma Shankar
2148a1596438SUma Shankar if (!diro->inode_read) {
2149a1596438SUma Shankar status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2150a1596438SUma Shankar if (status == 0)
215158a9ecbaSMichael Walle return NULL;
2152a1596438SUma Shankar }
21537f101be3SMichael Walle symlink = zalloc(le32_to_cpu(diro->inode.size) + 1);
2154a1596438SUma Shankar if (!symlink)
215558a9ecbaSMichael Walle return NULL;
2156a1596438SUma Shankar
21577f101be3SMichael Walle if (le32_to_cpu(diro->inode.size) < sizeof(diro->inode.b.symlink)) {
2158a1596438SUma Shankar strncpy(symlink, diro->inode.b.symlink,
21597f101be3SMichael Walle le32_to_cpu(diro->inode.size));
2160a1596438SUma Shankar } else {
2161a1596438SUma Shankar status = ext4fs_read_file(diro, 0,
21627f101be3SMichael Walle le32_to_cpu(diro->inode.size),
21639f12cd0eSSuriyan Ramasami symlink, &actread);
21649d2f6a9aSGary Bisson if ((status < 0) || (actread == 0)) {
2165a1596438SUma Shankar free(symlink);
216658a9ecbaSMichael Walle return NULL;
2167a1596438SUma Shankar }
2168a1596438SUma Shankar }
21697f101be3SMichael Walle symlink[le32_to_cpu(diro->inode.size)] = '\0';
2170a1596438SUma Shankar return symlink;
2171a1596438SUma Shankar }
2172a1596438SUma Shankar
ext4fs_find_file1(const char * currpath,struct ext2fs_node * currroot,struct ext2fs_node ** currfound,int * foundtype)2173a1596438SUma Shankar static int ext4fs_find_file1(const char *currpath,
2174a1596438SUma Shankar struct ext2fs_node *currroot,
2175a1596438SUma Shankar struct ext2fs_node **currfound, int *foundtype)
2176a1596438SUma Shankar {
2177a1596438SUma Shankar char fpath[strlen(currpath) + 1];
2178a1596438SUma Shankar char *name = fpath;
2179a1596438SUma Shankar char *next;
2180a1596438SUma Shankar int status;
2181a1596438SUma Shankar int type = FILETYPE_DIRECTORY;
2182a1596438SUma Shankar struct ext2fs_node *currnode = currroot;
2183a1596438SUma Shankar struct ext2fs_node *oldnode = currroot;
2184a1596438SUma Shankar
2185a1596438SUma Shankar strncpy(fpath, currpath, strlen(currpath) + 1);
2186a1596438SUma Shankar
2187a1596438SUma Shankar /* Remove all leading slashes. */
2188a1596438SUma Shankar while (*name == '/')
2189a1596438SUma Shankar name++;
2190a1596438SUma Shankar
2191a1596438SUma Shankar if (!*name) {
2192a1596438SUma Shankar *currfound = currnode;
2193a1596438SUma Shankar return 1;
2194a1596438SUma Shankar }
2195a1596438SUma Shankar
2196a1596438SUma Shankar for (;;) {
2197a1596438SUma Shankar int found;
2198a1596438SUma Shankar
2199a1596438SUma Shankar /* Extract the actual part from the pathname. */
2200a1596438SUma Shankar next = strchr(name, '/');
2201a1596438SUma Shankar if (next) {
2202a1596438SUma Shankar /* Remove all leading slashes. */
2203a1596438SUma Shankar while (*next == '/')
2204a1596438SUma Shankar *(next++) = '\0';
2205a1596438SUma Shankar }
2206a1596438SUma Shankar
2207a1596438SUma Shankar if (type != FILETYPE_DIRECTORY) {
2208a1596438SUma Shankar ext4fs_free_node(currnode, currroot);
2209a1596438SUma Shankar return 0;
2210a1596438SUma Shankar }
2211a1596438SUma Shankar
2212a1596438SUma Shankar oldnode = currnode;
2213a1596438SUma Shankar
2214a1596438SUma Shankar /* Iterate over the directory. */
2215a1596438SUma Shankar found = ext4fs_iterate_dir(currnode, name, &currnode, &type);
2216a1596438SUma Shankar if (found == 0)
2217a1596438SUma Shankar return 0;
2218a1596438SUma Shankar
2219a1596438SUma Shankar if (found == -1)
2220a1596438SUma Shankar break;
2221a1596438SUma Shankar
2222a1596438SUma Shankar /* Read in the symlink and follow it. */
2223a1596438SUma Shankar if (type == FILETYPE_SYMLINK) {
2224a1596438SUma Shankar char *symlink;
2225a1596438SUma Shankar
2226a1596438SUma Shankar /* Test if the symlink does not loop. */
2227a1596438SUma Shankar if (++symlinknest == 8) {
2228a1596438SUma Shankar ext4fs_free_node(currnode, currroot);
2229a1596438SUma Shankar ext4fs_free_node(oldnode, currroot);
2230a1596438SUma Shankar return 0;
2231a1596438SUma Shankar }
2232a1596438SUma Shankar
2233a1596438SUma Shankar symlink = ext4fs_read_symlink(currnode);
2234a1596438SUma Shankar ext4fs_free_node(currnode, currroot);
2235a1596438SUma Shankar
2236a1596438SUma Shankar if (!symlink) {
2237a1596438SUma Shankar ext4fs_free_node(oldnode, currroot);
2238a1596438SUma Shankar return 0;
2239a1596438SUma Shankar }
2240a1596438SUma Shankar
2241a1596438SUma Shankar debug("Got symlink >%s<\n", symlink);
2242a1596438SUma Shankar
2243a1596438SUma Shankar if (symlink[0] == '/') {
2244a1596438SUma Shankar ext4fs_free_node(oldnode, currroot);
2245a1596438SUma Shankar oldnode = &ext4fs_root->diropen;
2246a1596438SUma Shankar }
2247a1596438SUma Shankar
2248a1596438SUma Shankar /* Lookup the node the symlink points to. */
2249a1596438SUma Shankar status = ext4fs_find_file1(symlink, oldnode,
2250a1596438SUma Shankar &currnode, &type);
2251a1596438SUma Shankar
2252a1596438SUma Shankar free(symlink);
2253a1596438SUma Shankar
2254a1596438SUma Shankar if (status == 0) {
2255a1596438SUma Shankar ext4fs_free_node(oldnode, currroot);
2256a1596438SUma Shankar return 0;
2257a1596438SUma Shankar }
2258a1596438SUma Shankar }
2259a1596438SUma Shankar
2260a1596438SUma Shankar ext4fs_free_node(oldnode, currroot);
2261a1596438SUma Shankar
2262a1596438SUma Shankar /* Found the node! */
2263a1596438SUma Shankar if (!next || *next == '\0') {
2264a1596438SUma Shankar *currfound = currnode;
2265a1596438SUma Shankar *foundtype = type;
2266a1596438SUma Shankar return 1;
2267a1596438SUma Shankar }
2268a1596438SUma Shankar name = next;
2269a1596438SUma Shankar }
2270a1596438SUma Shankar return -1;
2271a1596438SUma Shankar }
2272a1596438SUma Shankar
ext4fs_find_file(const char * path,struct ext2fs_node * rootnode,struct ext2fs_node ** foundnode,int expecttype)2273a1596438SUma Shankar int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode,
2274a1596438SUma Shankar struct ext2fs_node **foundnode, int expecttype)
2275a1596438SUma Shankar {
2276a1596438SUma Shankar int status;
2277a1596438SUma Shankar int foundtype = FILETYPE_DIRECTORY;
2278a1596438SUma Shankar
2279a1596438SUma Shankar symlinknest = 0;
2280a1596438SUma Shankar if (!path)
2281a1596438SUma Shankar return 0;
2282a1596438SUma Shankar
2283a1596438SUma Shankar status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype);
2284a1596438SUma Shankar if (status == 0)
2285a1596438SUma Shankar return 0;
2286a1596438SUma Shankar
2287a1596438SUma Shankar /* Check if the node that was found was of the expected type. */
2288a1596438SUma Shankar if ((expecttype == FILETYPE_REG) && (foundtype != expecttype))
2289a1596438SUma Shankar return 0;
2290a1596438SUma Shankar else if ((expecttype == FILETYPE_DIRECTORY)
2291a1596438SUma Shankar && (foundtype != expecttype))
2292a1596438SUma Shankar return 0;
2293a1596438SUma Shankar
2294a1596438SUma Shankar return 1;
2295a1596438SUma Shankar }
2296a1596438SUma Shankar
ext4fs_open(const char * filename,loff_t * len)22979f12cd0eSSuriyan Ramasami int ext4fs_open(const char *filename, loff_t *len)
2298a1596438SUma Shankar {
2299a1596438SUma Shankar struct ext2fs_node *fdiro = NULL;
2300a1596438SUma Shankar int status;
2301a1596438SUma Shankar
2302a1596438SUma Shankar if (ext4fs_root == NULL)
2303a1596438SUma Shankar return -1;
2304a1596438SUma Shankar
2305a1596438SUma Shankar ext4fs_file = NULL;
2306a1596438SUma Shankar status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro,
2307a1596438SUma Shankar FILETYPE_REG);
2308a1596438SUma Shankar if (status == 0)
2309a1596438SUma Shankar goto fail;
2310a1596438SUma Shankar
2311a1596438SUma Shankar if (!fdiro->inode_read) {
2312a1596438SUma Shankar status = ext4fs_read_inode(fdiro->data, fdiro->ino,
2313a1596438SUma Shankar &fdiro->inode);
2314a1596438SUma Shankar if (status == 0)
2315a1596438SUma Shankar goto fail;
2316a1596438SUma Shankar }
23177f101be3SMichael Walle *len = le32_to_cpu(fdiro->inode.size);
2318a1596438SUma Shankar ext4fs_file = fdiro;
2319a1596438SUma Shankar
23209f12cd0eSSuriyan Ramasami return 0;
2321a1596438SUma Shankar fail:
2322a1596438SUma Shankar ext4fs_free_node(fdiro, &ext4fs_root->diropen);
2323a1596438SUma Shankar
2324a1596438SUma Shankar return -1;
2325a1596438SUma Shankar }
2326a1596438SUma Shankar
ext4fs_mount(unsigned part_length)2327a1596438SUma Shankar int ext4fs_mount(unsigned part_length)
2328a1596438SUma Shankar {
2329a1596438SUma Shankar struct ext2_data *data;
2330a1596438SUma Shankar int status;
2331a1596438SUma Shankar struct ext_filesystem *fs = get_fs();
233250ce4c07SEgbert Eich data = zalloc(SUPERBLOCK_SIZE);
2333a1596438SUma Shankar if (!data)
2334a1596438SUma Shankar return 0;
2335a1596438SUma Shankar
2336a1596438SUma Shankar /* Read the superblock. */
233750ce4c07SEgbert Eich status = ext4_read_superblock((char *)&data->sblock);
2338a1596438SUma Shankar
2339a1596438SUma Shankar if (status == 0)
2340a1596438SUma Shankar goto fail;
2341a1596438SUma Shankar
2342a1596438SUma Shankar /* Make sure this is an ext2 filesystem. */
23437f101be3SMichael Walle if (le16_to_cpu(data->sblock.magic) != EXT2_MAGIC)
234451be4716SMarek Behún goto fail_noerr;
2345a1596438SUma Shankar
23466f94ab66STom Rini
2347fc214ef9SStefan Brüns if (le32_to_cpu(data->sblock.revision_level) == 0) {
2348a1596438SUma Shankar fs->inodesz = 128;
23493cc5bbb8SStefan Brüns fs->gdsize = 32;
2350fc214ef9SStefan Brüns } else {
2351fc214ef9SStefan Brüns debug("EXT4 features COMPAT: %08x INCOMPAT: %08x RO_COMPAT: %08x\n",
2352fc214ef9SStefan Brüns __le32_to_cpu(data->sblock.feature_compatibility),
2353fc214ef9SStefan Brüns __le32_to_cpu(data->sblock.feature_incompat),
2354fc214ef9SStefan Brüns __le32_to_cpu(data->sblock.feature_ro_compat));
2355a1596438SUma Shankar
2356fc214ef9SStefan Brüns fs->inodesz = le16_to_cpu(data->sblock.inode_size);
2357fc214ef9SStefan Brüns fs->gdsize = le32_to_cpu(data->sblock.feature_incompat) &
2358fc214ef9SStefan Brüns EXT4_FEATURE_INCOMPAT_64BIT ?
2359fc214ef9SStefan Brüns le16_to_cpu(data->sblock.descriptor_size) : 32;
2360fc214ef9SStefan Brüns }
2361fc214ef9SStefan Brüns
2362fc214ef9SStefan Brüns debug("EXT2 rev %d, inode_size %d, descriptor size %d\n",
2363fc214ef9SStefan Brüns le32_to_cpu(data->sblock.revision_level),
2364fc214ef9SStefan Brüns fs->inodesz, fs->gdsize);
2365a1596438SUma Shankar
2366a1596438SUma Shankar data->diropen.data = data;
2367a1596438SUma Shankar data->diropen.ino = 2;
2368a1596438SUma Shankar data->diropen.inode_read = 1;
2369a1596438SUma Shankar data->inode = &data->diropen.inode;
2370a1596438SUma Shankar
2371a1596438SUma Shankar status = ext4fs_read_inode(data, 2, data->inode);
2372a1596438SUma Shankar if (status == 0)
2373a1596438SUma Shankar goto fail;
2374a1596438SUma Shankar
2375a1596438SUma Shankar ext4fs_root = data;
2376a1596438SUma Shankar
2377a1596438SUma Shankar return 1;
2378a1596438SUma Shankar fail:
2379a1596438SUma Shankar printf("Failed to mount ext2 filesystem...\n");
238051be4716SMarek Behún fail_noerr:
2381a1596438SUma Shankar free(data);
2382a1596438SUma Shankar ext4fs_root = NULL;
2383a1596438SUma Shankar
2384a1596438SUma Shankar return 0;
2385a1596438SUma Shankar }
2386