block.c (4348355032c027d0029994fc62da395e68afb60d) block.c (33f2663bd58696ab836731830f9fb6a878a5b944)
1/*
2 * QEMU System Emulator block driver
3 *
4 * Copyright (c) 2003 Fabrice Bellard
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights

--- 2483 unchanged lines hidden (view full) ---

2492 }
2493
2494 /* bs->file always needs to be consistent because of the metadata. We
2495 * can never allow other users to resize or write to it. */
2496 if (!(flags & BDRV_O_NO_IO)) {
2497 perm |= BLK_PERM_CONSISTENT_READ;
2498 }
2499 shared &= ~(BLK_PERM_WRITE | BLK_PERM_RESIZE);
1/*
2 * QEMU System Emulator block driver
3 *
4 * Copyright (c) 2003 Fabrice Bellard
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights

--- 2483 unchanged lines hidden (view full) ---

2492 }
2493
2494 /* bs->file always needs to be consistent because of the metadata. We
2495 * can never allow other users to resize or write to it. */
2496 if (!(flags & BDRV_O_NO_IO)) {
2497 perm |= BLK_PERM_CONSISTENT_READ;
2498 }
2499 shared &= ~(BLK_PERM_WRITE | BLK_PERM_RESIZE);
2500
2501 if (bs->open_flags & BDRV_O_INACTIVE) {
2502 shared |= BLK_PERM_WRITE | BLK_PERM_RESIZE;
2503 }
2504
2505 *nperm = perm;
2506 *nshared = shared;
2500 } else {
2501 /* We want consistent read from backing files if the parent needs it.
2502 * No other operations are performed on backing files. */
2503 perm &= BLK_PERM_CONSISTENT_READ;
2504
2505 /* If the parent can deal with changing data, we're okay with a
2506 * writable and resizable backing file. */
2507 /* TODO Require !(perm & BLK_PERM_CONSISTENT_READ), too? */
2508 if (shared & BLK_PERM_WRITE) {
2509 shared = BLK_PERM_WRITE | BLK_PERM_RESIZE;
2510 } else {
2511 shared = 0;
2512 }
2513
2514 shared |= BLK_PERM_CONSISTENT_READ | BLK_PERM_GRAPH_MOD |
2515 BLK_PERM_WRITE_UNCHANGED;
2507 } else {
2508 /* We want consistent read from backing files if the parent needs it.
2509 * No other operations are performed on backing files. */
2510 perm &= BLK_PERM_CONSISTENT_READ;
2511
2512 /* If the parent can deal with changing data, we're okay with a
2513 * writable and resizable backing file. */
2514 /* TODO Require !(perm & BLK_PERM_CONSISTENT_READ), too? */
2515 if (shared & BLK_PERM_WRITE) {
2516 shared = BLK_PERM_WRITE | BLK_PERM_RESIZE;
2517 } else {
2518 shared = 0;
2519 }
2520
2521 shared |= BLK_PERM_CONSISTENT_READ | BLK_PERM_GRAPH_MOD |
2522 BLK_PERM_WRITE_UNCHANGED;
2516 }
2517
2523
2518 if (bs->open_flags & BDRV_O_INACTIVE) {
2519 shared |= BLK_PERM_WRITE | BLK_PERM_RESIZE;
2520 }
2524 if (bs->open_flags & BDRV_O_INACTIVE) {
2525 shared |= BLK_PERM_WRITE | BLK_PERM_RESIZE;
2526 }
2521
2527
2522 *nperm = perm;
2523 *nshared = shared;
2528 *nperm = perm;
2529 *nshared = shared;
2530 }
2524}
2525
2526uint64_t bdrv_qapi_perm_to_blk_perm(BlockPermission qapi_perm)
2527{
2528 static const uint64_t permissions[] = {
2529 [BLOCK_PERMISSION_CONSISTENT_READ] = BLK_PERM_CONSISTENT_READ,
2530 [BLOCK_PERMISSION_WRITE] = BLK_PERM_WRITE,
2531 [BLOCK_PERMISSION_WRITE_UNCHANGED] = BLK_PERM_WRITE_UNCHANGED,

--- 4392 unchanged lines hidden --- 		2531}
2532
2533uint64_t bdrv_qapi_perm_to_blk_perm(BlockPermission qapi_perm)
2534{
2535 static const uint64_t permissions[] = {
2536 [BLOCK_PERMISSION_CONSISTENT_READ] = BLK_PERM_CONSISTENT_READ,
2537 [BLOCK_PERMISSION_WRITE] = BLK_PERM_WRITE,
2538 [BLOCK_PERMISSION_WRITE_UNCHANGED] = BLK_PERM_WRITE_UNCHANGED,

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