3  * NTFS kernel compressed attributes handling.
100  * zero_partial_compressed_page - zero out of bounds compressed page region
120  * handle_bounds_compressed_page - test for&handle out of bounds compressed page
161  * Return 0 if success or -EOVERFLOW on error in the compressed stream.
178 	 * Pointers into the compressed data, i.e. the compression block (cb),  in ntfs_decompress()
256 	/* Does the minimum size of a compressed sb overflow valid range? */  in ntfs_decompress()
286 		/* This sb is not compressed, just copy it into destination. */  in ntfs_decompress()
314 	ntfs_debug("Found compressed sub-block.");  in ntfs_decompress()
315 	/* This sb is compressed, decompress it into destination. */  in ntfs_decompress()
446  * ntfs_read_compressed_block - read a compressed block into the page cache
450  * attribute is known to be non-resident, not encrypted, but compressed.
456  * 5. Throw the compressed data away and proceed to 3. for the next compression
476 	u32 cb_size = ni->itype.compressed.block_size;  in ntfs_read_compressed_block()
491 			ni->itype.compressed.block_size_bits;  in ntfs_read_compressed_block()
550 		ntfs_debug("Compressed read outside i_size - truncated?");  in ntfs_read_compressed_block()
584 	cb_clusters = ni->itype.compressed.block_clusters;  in ntfs_read_compressed_block()
786 		/* Compressed cb, decompress it into the destination page(s). */  in ntfs_read_compressed_block()
789 		ntfs_debug("Found compressed compression block.");  in ntfs_read_compressed_block()
860 	ntfs_error(vol->sb, "IO error while reading compressed data.");  in ntfs_read_compressed_block()
1078  * Returns a header of two bytes followed by the compressed data.
1085  * Returns the size of the compressed block, including the
1251 	/* Determine whether to store the data compressed or uncompressed. */  in ntfs_compress_block()
1253 		/* Compressed. */  in ntfs_compress_block()
1283 	/* a single compressed zero */  in ntfs_write_cb()
1285 	/* a couple of compressed zeroes */  in ntfs_write_cb()
1287 	/* more compressed zeroes, to be followed by some count */  in ntfs_write_cb()
1293 	int pages_count = (round_up(ni->itype.compressed.block_size + 2 *  in ntfs_write_cb()
1294 		(ni->itype.compressed.block_size / NTFS_SB_SIZE) + 2, PAGE_SIZE)) / PAGE_SIZE;  in ntfs_write_cb()
1339 			    ni->itype.compressed.block_size))  in ntfs_write_cb()
1378 			pos & ~((loff_t)ni->itype.compressed.block_size - 1));  in ntfs_write_cb()
1381 	err = ntfs_non_resident_attr_punch_hole(ni, new_vcn, ni->itype.compressed.block_clusters);  in ntfs_write_cb()
1472 	int pages_per_cb = ni->itype.compressed.block_size >> PAGE_SHIFT;  in ntfs_compress_write()
1473 	int cb_size = ni->itype.compressed.block_size, cb_off, err = 0;  in ntfs_compress_write()
1483 				round_up(end, ni->itype.compressed.block_size));  in ntfs_compress_write()