| block.c (5d69b5ab85d30201c1f5ef34651ba910977fc583) | block.c (810803a87ce88abd695f07f434d00e7cd1e122e2) |
|---|---|
| 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 --- 6258 unchanged lines hidden (view full) --- 6267 BdrvChild *child = bs->file ?: bs->backing; 6268 return bdrv_recurse_can_replace(child->bs, to_replace); 6269 } 6270 6271 /* Safe default */ 6272 return false; 6273} 6274 | 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 --- 6258 unchanged lines hidden (view full) --- 6267 BdrvChild *child = bs->file ?: bs->backing; 6268 return bdrv_recurse_can_replace(child->bs, to_replace); 6269 } 6270 6271 /* Safe default */ 6272 return false; 6273} 6274 |
| 6275/* 6276 * Check whether the given @node_name can be replaced by a node that 6277 * has the same data as @parent_bs. If so, return @node_name's BDS; 6278 * NULL otherwise. 6279 * 6280 * @node_name must be a (recursive) *child of @parent_bs (or this 6281 * function will return NULL). 6282 * 6283 * The result (whether the node can be replaced or not) is only valid 6284 * for as long as no graph or permission changes occur. 6285 */ |
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| 6275BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs, 6276 const char *node_name, Error **errp) 6277{ 6278 BlockDriverState *to_replace_bs = bdrv_find_node(node_name); 6279 AioContext *aio_context; 6280 6281 if (!to_replace_bs) { 6282 error_setg(errp, "Node name '%s' not found", node_name); --- 8 unchanged lines hidden (view full) --- 6291 goto out; 6292 } 6293 6294 /* We don't want arbitrary node of the BDS chain to be replaced only the top 6295 * most non filter in order to prevent data corruption. 6296 * Another benefit is that this tests exclude backing files which are 6297 * blocked by the backing blockers. 6298 */ | 6286BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs, 6287 const char *node_name, Error **errp) 6288{ 6289 BlockDriverState *to_replace_bs = bdrv_find_node(node_name); 6290 AioContext *aio_context; 6291 6292 if (!to_replace_bs) { 6293 error_setg(errp, "Node name '%s' not found", node_name); --- 8 unchanged lines hidden (view full) --- 6302 goto out; 6303 } 6304 6305 /* We don't want arbitrary node of the BDS chain to be replaced only the top 6306 * most non filter in order to prevent data corruption. 6307 * Another benefit is that this tests exclude backing files which are 6308 * blocked by the backing blockers. 6309 */ |
| 6299 if (!bdrv_recurse_is_first_non_filter(parent_bs, to_replace_bs)) { 6300 error_setg(errp, "Only top most non filter can be replaced"); | 6310 if (!bdrv_recurse_can_replace(parent_bs, to_replace_bs)) { 6311 error_setg(errp, "Cannot replace '%s' by a node mirrored from '%s', " 6312 "because it cannot be guaranteed that doing so would not " 6313 "lead to an abrupt change of visible data", 6314 node_name, parent_bs->node_name); |
| 6301 to_replace_bs = NULL; 6302 goto out; 6303 } 6304 6305out: 6306 aio_context_release(aio_context); 6307 return to_replace_bs; 6308} --- 308 unchanged lines hidden --- | 6315 to_replace_bs = NULL; 6316 goto out; 6317 } 6318 6319out: 6320 aio_context_release(aio_context); 6321 return to_replace_bs; 6322} --- 308 unchanged lines hidden --- |