48  * UBIFS stores nodes at 64 bit-aligned addresses. If the node length is not
49  * aligned, UBIFS starts the next node from the aligned address, and the padded
51  * bytes in those small gaps. Common headers of nodes store real node lengths,
55  * uses padding nodes or padding bytes, if the padding node does not fit.
211  * ubifs_check_node - check node.
213  * @buf: node to check
219  * This function checks node magic number and CRC checksum. This function also
220  * validates node length to prevent UBIFS from becoming crazy when an attacker
222  * node length in the common header could cause UBIFS to read memory outside of
260 			ubifs_err(c, "bad node type %d", type);  in ubifs_check_node()
293 		ubifs_err(c, "bad node length %d", node_len);  in ubifs_check_node()
296 		ubifs_err(c, "bad node at LEB %d:%d", lnum, offs);  in ubifs_check_node()
310  * when we have to write less data we add padding node to the write-buffer and
313  * padding node which takes %UBIFS_PAD_NODE_SZ bytes, we write padding bytes
341 		/* Too little space, padding node won't fit */  in ubifs_pad()
370  * ubifs_prepare_node - prepare node to be written to flash.
372  * @node: the node to pad
373  * @len: node length
376  * This function prepares node at @node to be written to the media - it
377  * calculates node CRC, fills the common header, and adds proper padding up to
380 void ubifs_prepare_node(struct ubifs_info *c, void *node, int len, int pad)  in ubifs_prepare_node()  argument
383 	struct ubifs_ch *ch = node;  in ubifs_prepare_node()
393 	crc = crc32(UBIFS_CRC32_INIT, node + 8, len - 8);  in ubifs_prepare_node()
399 		ubifs_pad(c, node + len, pad);  in ubifs_prepare_node()
404  * ubifs_prep_grp_node - prepare node of a group to be written to flash.
406  * @node: the node to pad
407  * @len: node length
408  * @last: indicates the last node of the group
410  * This function prepares node at @node to be written to the media - it
411  * calculates node CRC and fills the common header.
413 void ubifs_prep_grp_node(struct ubifs_info *c, void *node, int len, int last)  in ubifs_prep_grp_node()  argument
416 	struct ubifs_ch *ch = node;  in ubifs_prep_grp_node()
429 	crc = crc32(UBIFS_CRC32_INIT, node + 8, len - 8);  in ubifs_prep_grp_node()
668  * @buf: node to write
669  * @len: node length
672  * the last piece of the node won't reach the flash media immediately if it
673  * does not take whole max. write unit (@c->max_write_size). Instead, the node
678  * case of failure. If the node cannot be written because there is no more
714 		 * The node is not very large and fits entirely within  in ubifs_wbuf_write_nolock()
751 		 * The node is large enough and does not fit entirely within  in ubifs_wbuf_write_nolock()
791 	 * We align node length to 8-byte boundary because we anyway flash wbuf  in ubifs_wbuf_write_nolock()
851  * ubifs_write_node - write node to the media.
853  * @buf: the node to write
854  * @len: node length
858  * This function automatically fills node magic number, assigns sequence
859  * number, and calculates node CRC checksum. The length of the @buf buffer has
861  * appends padding node and padding bytes if needed. Returns zero in case of
890  * ubifs_read_node_wbuf - read node from the media or write-buffer.
893  * @type: node type
894  * @len: node length
898  * This function reads a node of known type and length, checks it and stores
899  * in @buf. If the node partially or fully sits in the write-buffer, this
942 		ubifs_err(c, "bad node type (%d but expected %d)",  in ubifs_read_node_wbuf()
949 		ubifs_err(c, "expected node type %d", type);  in ubifs_read_node_wbuf()
955 		ubifs_err(c, "bad node length %d, expected %d", rlen, len);  in ubifs_read_node_wbuf()
962 	ubifs_err(c, "bad node at LEB %d:%d", lnum, offs);  in ubifs_read_node_wbuf()
969  * ubifs_read_node - read node.
972  * @type: node type
973  * @len: node length (not aligned)
977  * This function reads a node of known type and and length, checks it and
998 		ubifs_errc(c, "bad node type (%d but expected %d)",  in ubifs_read_node()
1005 		ubifs_errc(c, "expected node type %d", type);  in ubifs_read_node()
1011 		ubifs_errc(c, "bad node length %d, expected %d", l, len);  in ubifs_read_node()
1018 	ubifs_errc(c, "bad node at LEB %d:%d, LEB mapping status %d", lnum,  in ubifs_read_node()
1140 			 * a _copy_ of corresponding on-flash node which sits  in ubifs_sync_wbufs_by_inode()