200  * @offset: A guest offset, used to calculate what slice of the L2
202  * @l2_offset: Offset to the L2 table in the image file.
203  * @l2_slice: Location to store the pointer to the L2 slice.
205  * Loads a L2 slice into memory (L2 slices are the parts of L2 tables
207  * the cache is used; otherwise the L2 slice is loaded from the image
266  * Allocate a new l2 entry in the file. If l1_index points to an already
267  * used entry in the L2 table (i.e. we are doing a copy on write for the L2
268  * table) copy the contents of the old L2 table into the newly allocated one.
286     /* allocate a new l2 entry */  in l2_allocate()
300                                 "allocation of L2 table at offset 0");  in l2_allocate()
310     /* allocate a new entry in the l2 cache */  in l2_allocate()
325             /* if there was no old l2 table, clear the new slice */  in l2_allocate()
332             /* if there was an old l2 table, read a slice from the disk */  in l2_allocate()
345         /* write the l2 slice to the file */  in l2_allocate()
383  * For a given L2 entry, count the number of contiguous subclusters of
391  * If the L2 entry is invalid return -errno and set @type to
433  * in a given L2 slice, starting from cluster @l2_index, subcluster
574  * If the cluster is compressed then *host_offset will contain the l2 entry.
603      * containing offset and the end of the l2 slice that contains  in qcow2_get_host_offset()
615     /* seek to the l2 offset in the l1 table */  in qcow2_get_host_offset()
630         qcow2_signal_corruption(bs, true, -1, -1, "L2 table offset %#" PRIx64  in qcow2_get_host_offset()
636     /* load the l2 slice in memory */  in qcow2_get_host_offset()
660                                 " in pre-v3 image (L2 offset: %#" PRIx64  in qcow2_get_host_offset()
661                                 ", L2 index: %#x)", l2_offset, l2_index);  in qcow2_get_host_offset()
672                                     "file (L2 offset: %#" PRIx64 ", L2 index: "  in qcow2_get_host_offset()
690                                     PRIx64 " unaligned (L2 offset: %#" PRIx64  in qcow2_get_host_offset()
691                                     ", L2 index: %#x)", host_cluster_offset,  in qcow2_get_host_offset()
701                                     ", L2 index: %#x)", host_cluster_offset,  in qcow2_get_host_offset()
716                                 " (L2 offset: %#" PRIx64 ", L2 index: %#x)",  in qcow2_get_host_offset()
749  * the appropriate slice of its l2 table.
751  * the cluster index in the l2 slice is given to the caller.
765     /* seek to the l2 offset in the l1 table */  in get_cluster_table()
778         qcow2_signal_corruption(bs, true, -1, -1, "L2 table offset %#" PRIx64  in get_cluster_table()
785         /* First allocate a new L2 table (and do COW if needed) */  in get_cluster_table()
797         /* Get the offset of the newly-allocated l2 table */  in get_cluster_table()
802     /* load the l2 slice in memory */  in get_cluster_table()
864     /* The offset and size must fit in their fields of the L2 table entry */  in qcow2_alloc_compressed_cluster_offset()
871     /* update L2 table */  in qcow2_alloc_compressed_cluster_offset()
1015      * Before we update the L2 table to actually point to the new cluster, we  in perform_cow()
1051     /* Update L2 table. */  in qcow2_alloc_cluster_link_l2()
1073          * The first one to complete updates l2 table with pointer to its  in qcow2_alloc_cluster_link_l2()
1075          * perform_cow()), update l2 table with its cluster pointer and free  in qcow2_alloc_cluster_link_l2()
1081         /* The offset must fit in the offset field of the L2 table entry */  in qcow2_alloc_cluster_link_l2()
1142  * request does not need copy-on-write or changes to the L2 metadata
1150  * @l2_slice contains the L2 entries of all clusters involved in this
1201                                     "entry found (L2 offset: %#" PRIx64  in calculate_l2_meta()
1202                                     ", L2 index: %#x)",  in calculate_l2_meta()
1212     /* Get the L2 entry of the first cluster */  in calculate_l2_meta()
1256     /* Get the L2 entry of the last cluster */  in calculate_l2_meta()
1393  * request has completed and updated the L2 table accordingly.
1513      * Calculate the number of clusters to look for. We stop at L2 slice  in handle_copied()
1524     /* Find L2 entry for the first involved cluster */  in handle_copied()
1678      * Calculate the number of clusters to look for. We stop at L2 slice  in handle_alloc()
1689     /* Find L2 entry for the first involved cluster */  in handle_alloc()
1774  * not. The caller is responsible for updating the L2 metadata of the
1898  * all clusters in the same L2 slice) and returns the number of discarded
1916     /* Limit nb_clusters to one L2 slice */  in discard_in_l2_slice()
1972         /* First remove L2 entries */  in discard_in_l2_slice()
2014     /* Each L2 slice is handled by its own loop iteration */  in qcow2_cluster_discard()
2037  * all clusters in the same L2 slice) and returns the number of zeroed
2055     /* Limit nb_clusters to one L2 slice */  in zero_in_l2_slice()
2084         /* First update L2 entries */  in zero_in_l2_slice()
2211     /* Each L2 slice is handled by its own loop iteration */  in qcow2_subcluster_zeroize()
2269         /* inactive L2 tables require a buffer to be stored in when loading  in expand_zero_clusters_in_l1()
2291             qcow2_signal_corruption(bs, true, -1, -1, "L2 table offset %#"  in expand_zero_clusters_in_l1()
2308                 /* get active L2 tables from cache */  in expand_zero_clusters_in_l1()
2312                 /* load inactive L2 tables from disk */  in expand_zero_clusters_in_l1()
2353                         /* For shared L2 tables, set the refcount accordingly  in expand_zero_clusters_in_l1()
2372                         "%#" PRIx64 " unaligned (L2 offset: %#"  in expand_zero_clusters_in_l1()
2373                         PRIx64 ", L2 index: %#x)", offset,  in expand_zero_clusters_in_l1()
2488     /* Inactive L1 tables may point to active L2 tables - therefore it is  in qcow2_expand_zero_clusters()
2489      * necessary to flush the L2 table cache before trying to access the L2  in qcow2_expand_zero_clusters()
2492      * necessary to empty the L2 table cache, since it may contain tables which  in qcow2_expand_zero_clusters()