fs/jffs2/read.c

27 	struct jffs2_raw_inode *ri;
34 	ri = jffs2_alloc_raw_inode();
35 	if (!ri)
38 	ret = jffs2_flash_read(c, ref_offset(fd->raw), sizeof(*ri), &readlen, (char *)ri);
40 		jffs2_free_raw_inode(ri);
45 	if (readlen != sizeof(*ri)) {
46 		jffs2_free_raw_inode(ri);
48 			ref_offset(fd->raw), sizeof(*ri), readlen);
51 	crc = crc32(0, ri, sizeof(*ri)-8);
54 		  ref_offset(fd->raw), je32_to_cpu(ri->node_crc),
55 		  crc, je32_to_cpu(ri->dsize), je32_to_cpu(ri->csize),
56 		  je32_to_cpu(ri->offset), buf);
57 	if (crc != je32_to_cpu(ri->node_crc)) {
59 			je32_to_cpu(ri->node_crc), crc, ref_offset(fd->raw));
65 	if (ri->compr == JFFS2_COMPR_ZERO && !je32_to_cpu(ri->dsize) &&
66 	    je32_to_cpu(ri->csize)) {
67 		ri->dsize = ri->csize;
68 		ri->csize = cpu_to_je32(0);
71 	D1(if(ofs + len > je32_to_cpu(ri->dsize)) {
73 				len, ofs, je32_to_cpu(ri->dsize));
79 	if (ri->compr == JFFS2_COMPR_ZERO) {
90 	if (ri->compr == JFFS2_COMPR_NONE && len == je32_to_cpu(ri->dsize)) {
93 		readbuf = kmalloc(je32_to_cpu(ri->csize), GFP_KERNEL);
99 	if (ri->compr != JFFS2_COMPR_NONE) {
100 		if (len < je32_to_cpu(ri->dsize)) {
101 			decomprbuf = kmalloc(je32_to_cpu(ri->dsize), GFP_KERNEL);
113 	jffs2_dbg(2, "Read %d bytes to %p\n", je32_to_cpu(ri->csize),
115 	ret = jffs2_flash_read(c, (ref_offset(fd->raw)) + sizeof(*ri),
116 			       je32_to_cpu(ri->csize), &readlen, readbuf);
118 	if (!ret && readlen != je32_to_cpu(ri->csize))
123 	crc = crc32(0, readbuf, je32_to_cpu(ri->csize));
124 	if (crc != je32_to_cpu(ri->data_crc)) {
126 			je32_to_cpu(ri->data_crc), crc, ref_offset(fd->raw));
131 	if (ri->compr != JFFS2_COMPR_NONE) {
133 			  je32_to_cpu(ri->csize), readbuf,
134 			  je32_to_cpu(ri->dsize), decomprbuf);
135 		ret = jffs2_decompress(c, f, ri->compr | (ri->usercompr << 8), readbuf, decomprbuf, je32_to_cpu(ri->csize), je32_to_cpu(ri->dsize));
142 	if (len < je32_to_cpu(ri->dsize)) {
152 	jffs2_free_raw_inode(ri);