31  * Constants used in the compression code
39 	/* Compression sub-block constants. */
45 	 * The maximum compression block size is by definition 16 * the cluster
47 	 * maximum compression buffer size is 64kiB, so we use this when
48 	 * initializing the compression buffer.
134  * ntfs_decompress - decompress a compression block into an array of pages
143  * @cb_start:		compression block to decompress (IN)
144  * @cb_size:		size of compression block @cb_start in bytes (IN)
151  * This decompresses the compression block @cb_start into the array of
158  * @cb_start is a pointer to the compression block which needs decompressing
163  * completed during the decompression of the compression block (@cb_start).
169  * the compression block @cb_start as it is a per-CPU buffer.
178 	 * Pointers into the compressed data, i.e. the compression block (cb),  in ntfs_decompress()
207 	 * Have we reached the end of the compression block or the end of the  in ntfs_decompress()
209 	 * position in the compression block is one byte before its end so the  in ntfs_decompress()
447  * @folio:	locked folio in the compression block(s) we need to read
452  * 1. Determine which compression block(s) @page is in.
453  * 2. Get hold of all pages corresponding to this/these compression block(s).
454  * 3. Read the (first) compression block.
456  * 5. Throw the compressed data away and proceed to 3. for the next compression
457  *    block or return success if no more compression blocks left.
489 	/* Number of compression blocks (cbs) in the wanted vcn range. */  in ntfs_read_compressed_block()
494 	 * compression blocks (cbs) overlapping @page. Due to alignment  in ntfs_read_compressed_block()
580 	 * Now read the first compression block.  in ntfs_read_compressed_block()
674 	ntfs_debug("Successfully read the compression block.");  in ntfs_read_compressed_block()
681 	/* Catch end of file inside a compression block. */  in ntfs_read_compressed_block()
687 		ntfs_debug("Found sparse compression block.");  in ntfs_read_compressed_block()
734 		ntfs_debug("Found uncompressed compression block.");  in ntfs_read_compressed_block()
789 		ntfs_debug("Found compressed compression block.");  in ntfs_read_compressed_block()
800 				"ntfs_decompress() failed in inode 0x%llx with error code %i. Skipping this compression block.",  in ntfs_read_compressed_block()
850 	ntfs_error(vol->sb, "ntfs_map_runlist() failed. Cannot read compression block.");  in ntfs_read_compressed_block()
855 	ntfs_error(vol->sb, "ntfs_rl_vcn_to_lcn() failed. Cannot read compression block.");  in ntfs_read_compressed_block()
895  * are used solely for the match-finding algorithm during compression.
1079  * If compression is not effective, the header and an uncompressed
1135 		 * compression modes of zlib.  in ntfs_compress_block()
1267 	 * Free the compression context and return the total number of bytes  in ntfs_compress_block()