2  * JFFS2 -- Journalling Flash File System, Version 2.
4  * Copyright © 2001-2007 Red Hat, Inc.
36 		return -ENOMEM;  in jffs2_read_dnode()
38 	ret = jffs2_flash_read(c, ref_offset(fd->raw), sizeof(*ri), &readlen, (char *)ri);  in jffs2_read_dnode()
41 		pr_warn("Error reading node from 0x%08x: %d\n",  in jffs2_read_dnode()
42 			ref_offset(fd->raw), ret);  in jffs2_read_dnode()
47 		pr_warn("Short read from 0x%08x: wanted 0x%zx bytes, got 0x%zx\n",  in jffs2_read_dnode()
48 			ref_offset(fd->raw), sizeof(*ri), readlen);  in jffs2_read_dnode()
49 		return -EIO;  in jffs2_read_dnode()
51 	crc = crc32(0, ri, sizeof(*ri)-8);  in jffs2_read_dnode()
53 …jffs2_dbg(1, "Node read from %08x: node_crc %08x, calculated CRC %08x. dsize %x, csize %x, offset …  in jffs2_read_dnode()
54 		  ref_offset(fd->raw), je32_to_cpu(ri->node_crc),  in jffs2_read_dnode()
55 		  crc, je32_to_cpu(ri->dsize), je32_to_cpu(ri->csize),  in jffs2_read_dnode()
56 		  je32_to_cpu(ri->offset), buf);  in jffs2_read_dnode()
57 	if (crc != je32_to_cpu(ri->node_crc)) {  in jffs2_read_dnode()
58 		pr_warn("Node CRC %08x != calculated CRC %08x for node at %08x\n",  in jffs2_read_dnode()
59 			je32_to_cpu(ri->node_crc), crc, ref_offset(fd->raw));  in jffs2_read_dnode()
60 		ret = -EIO;  in jffs2_read_dnode()
65 	if (ri->compr == JFFS2_COMPR_ZERO && !je32_to_cpu(ri->dsize) &&  in jffs2_read_dnode()
66 	    je32_to_cpu(ri->csize)) {  in jffs2_read_dnode()
67 		ri->dsize = ri->csize;  in jffs2_read_dnode()
68 		ri->csize = cpu_to_je32(0);  in jffs2_read_dnode()
71 	D1(if(ofs + len > je32_to_cpu(ri->dsize)) {  in jffs2_read_dnode()
72 			pr_warn("jffs2_read_dnode() asked for %d bytes at %d from %d-byte node\n",  in jffs2_read_dnode()
73 				len, ofs, je32_to_cpu(ri->dsize));  in jffs2_read_dnode()
74 		ret = -EINVAL;  in jffs2_read_dnode()
79 	if (ri->compr == JFFS2_COMPR_ZERO) {  in jffs2_read_dnode()
85 	   Reading whole node and it's uncompressed - read directly to buffer provided, check CRC.  in jffs2_read_dnode()
86 …Reading whole node and it's compressed - read into comprbuf, check CRC and decompress to buffer pr…  in jffs2_read_dnode()
87 	   Reading partial node and it's uncompressed - read into readbuf, check CRC, and copy  in jffs2_read_dnode()
88 …Reading partial node and it's compressed - read into readbuf, check checksum, decompress to decomp…  in jffs2_read_dnode()
90 	if (ri->compr == JFFS2_COMPR_NONE && len == je32_to_cpu(ri->dsize)) {  in jffs2_read_dnode()
93 		readbuf = kmalloc(je32_to_cpu(ri->csize), GFP_KERNEL);  in jffs2_read_dnode()
95 			ret = -ENOMEM;  in jffs2_read_dnode()
99 	if (ri->compr != JFFS2_COMPR_NONE) {  in jffs2_read_dnode()
100 		if (len < je32_to_cpu(ri->dsize)) {  in jffs2_read_dnode()
101 			decomprbuf = kmalloc(je32_to_cpu(ri->dsize), GFP_KERNEL);  in jffs2_read_dnode()
103 				ret = -ENOMEM;  in jffs2_read_dnode()
113 	jffs2_dbg(2, "Read %d bytes to %p\n", je32_to_cpu(ri->csize),  in jffs2_read_dnode()
115 	ret = jffs2_flash_read(c, (ref_offset(fd->raw)) + sizeof(*ri),  in jffs2_read_dnode()
116 			       je32_to_cpu(ri->csize), &readlen, readbuf);  in jffs2_read_dnode()
118 	if (!ret && readlen != je32_to_cpu(ri->csize))  in jffs2_read_dnode()
119 		ret = -EIO;  in jffs2_read_dnode()
123 	crc = crc32(0, readbuf, je32_to_cpu(ri->csize));  in jffs2_read_dnode()
124 	if (crc != je32_to_cpu(ri->data_crc)) {  in jffs2_read_dnode()
125 		pr_warn("Data CRC %08x != calculated CRC %08x for node at %08x\n",  in jffs2_read_dnode()
126 			je32_to_cpu(ri->data_crc), crc, ref_offset(fd->raw));  in jffs2_read_dnode()
127 		ret = -EIO;  in jffs2_read_dnode()
130 	jffs2_dbg(2, "Data CRC matches calculated CRC %08x\n", crc);  in jffs2_read_dnode()
131 	if (ri->compr != JFFS2_COMPR_NONE) {  in jffs2_read_dnode()
133 			  je32_to_cpu(ri->csize), readbuf,  in jffs2_read_dnode()
134 			  je32_to_cpu(ri->dsize), decomprbuf);  in jffs2_read_dnode()
135 …et = jffs2_decompress(c, f, ri->compr | (ri->usercompr << 8), readbuf, decomprbuf, je32_to_cpu(ri-…  in jffs2_read_dnode()
142 	if (len < je32_to_cpu(ri->dsize)) {  in jffs2_read_dnode()
158 			   unsigned char *buf, uint32_t offset, uint32_t len)  in jffs2_read_inode_range()  argument
160 	uint32_t end = offset + len;  in jffs2_read_inode_range()
164 	jffs2_dbg(1, "%s(): ino #%u, range 0x%08x-0x%08x\n",  in jffs2_read_inode_range()
165 		  __func__, f->inocache->ino, offset, offset + len);  in jffs2_read_inode_range()
167 	frag = jffs2_lookup_node_frag(&f->fragtree, offset);  in jffs2_read_inode_range()
174 	while(offset < end) {  in jffs2_read_inode_range()
175 		jffs2_dbg(2, "%s(): offset %d, end %d\n",  in jffs2_read_inode_range()
176 			  __func__, offset, end);  in jffs2_read_inode_range()
177 		if (unlikely(!frag || frag->ofs > offset ||  in jffs2_read_inode_range()
178 			     frag->ofs + frag->size <= offset)) {  in jffs2_read_inode_range()
179 			uint32_t holesize = end - offset;  in jffs2_read_inode_range()
180 			if (frag && frag->ofs > offset) {  in jffs2_read_inode_range()
181 				jffs2_dbg(1, "Eep. Hole in ino #%u fraglist. frag->ofs = 0x%08x, offset = 0x%08x\n",  in jffs2_read_inode_range()
182 					  f->inocache->ino, frag->ofs, offset);  in jffs2_read_inode_range()
183 				holesize = min(holesize, frag->ofs - offset);  in jffs2_read_inode_range()
185 			jffs2_dbg(1, "Filling non-frag hole from %d-%d\n",  in jffs2_read_inode_range()
186 				  offset, offset + holesize);  in jffs2_read_inode_range()
189 			offset += holesize;  in jffs2_read_inode_range()
191 		} else if (unlikely(!frag->node)) {  in jffs2_read_inode_range()
192 			uint32_t holeend = min(end, frag->ofs + frag->size);  in jffs2_read_inode_range()
193 			jffs2_dbg(1, "Filling frag hole from %d-%d (frag 0x%x 0x%x)\n",  in jffs2_read_inode_range()
194 				  offset, holeend, frag->ofs,  in jffs2_read_inode_range()
195 				  frag->ofs + frag->size);  in jffs2_read_inode_range()
196 			memset(buf, 0, holeend - offset);  in jffs2_read_inode_range()
197 			buf += holeend - offset;  in jffs2_read_inode_range()
198 			offset = holeend;  in jffs2_read_inode_range()
203 			uint32_t fragofs; /* offset within the frag to start reading */  in jffs2_read_inode_range()
205 			fragofs = offset - frag->ofs;  in jffs2_read_inode_range()
206 			readlen = min(frag->size - fragofs, end - offset);  in jffs2_read_inode_range()
207 			jffs2_dbg(1, "Reading %d-%d from node at 0x%08x (%d)\n",  in jffs2_read_inode_range()
208 				  frag->ofs+fragofs,  in jffs2_read_inode_range()
209 				  frag->ofs + fragofs+readlen,  in jffs2_read_inode_range()
210 				  ref_offset(frag->node->raw),  in jffs2_read_inode_range()
211 				  ref_flags(frag->node->raw));  in jffs2_read_inode_range()
212 			ret = jffs2_read_dnode(c, f, frag->node, buf, fragofs + frag->ofs - frag->node->ofs, readlen);  in jffs2_read_inode_range()
221 			offset += readlen;  in jffs2_read_inode_range()