Foram formados lan\u00e7amentos corretivos dos projetos OpenZFS 2.1.14 e 2.2.2, que desenvolvem a implementa\u00e7\u00e3o do sistema de arquivos ZFS para Linux e FreeBSD. As atualiza\u00e7\u00f5es corrigem um problema no c\u00f3digo de verifica\u00e7\u00e3o da consist\u00eancia do cache dnode, que levava \u00e0 corrup\u00e7\u00e3o de dados em arquivos que continham \u00e1reas vazias ao serem copiados ap\u00f3s a realiza\u00e7\u00e3o de altera\u00e7\u00f5es. <\/p>\n
Inicialmente, o problema foi tentado ser resolvido na vers\u00e3o 2.2.1, mas a corre\u00e7\u00e3o acabou sendo ineficaz. O erro permaneceu sem ser notado por um longo tempo e come\u00e7ou a se manifestar ap\u00f3s as mudan\u00e7as feitas na utilidade «cp» no pacote coreutils 9.x. Sup\u00f5e-se que no Red Hat Enterprise Linux e nas distribui\u00e7\u00f5es baseadas nele o problema n\u00e3o se manifeste, pois no RHEL 9 \u00e9 utilizado o pacote coreutils 8.x com uma l\u00f3gica diferente de opera\u00e7\u00e3o da utilidade «cp». <\/p>\n
O problema se manifesta ao usar utilit\u00e1rios de c\u00f3pia de arquivos que conseguem identificar e otimizar \u00e1reas vazias em arquivos. A corrup\u00e7\u00e3o pode ocorrer em sistemas de arquivos sobrecarregados ao copiar um arquivo, se a opera\u00e7\u00e3o for realizada quase imediatamente ap\u00f3s uma altera\u00e7\u00e3o e parte dos dados permanecer apenas no cache sujo e ainda n\u00e3o for despejada no disco. <\/p>\n
Para otimizar o trabalho com \u00e1reas vazias em arquivos, o OpenZFS, a partir da vers\u00e3o 0.6.2, suporta as opera\u00e7\u00f5es SEEK_HOLE e SEEK_DATA, que permitem ignorar a \u00e1rea vazia do arquivo ao ler do disco. O reconhecimento de \u00e1reas vazias e a preserva\u00e7\u00e3o das informa\u00e7\u00f5es sobre elas s\u00e3o realizados somente ap\u00f3s o despejo no disco de todos os dados restantes no cache relacionados ao arquivo. Para iniciar o despejo no OpenZFS, existe uma verifica\u00e7\u00e3o que avalia a presen\u00e7a de dados n\u00e3o salvos no cache e realiza o despejo for\u00e7ado das informa\u00e7\u00f5es no disco, necess\u00e1rio para a utiliza\u00e7\u00e3o de SEEK_HOLE e SEEK_DATA. <\/p>\n
Infelizmente, a verifica\u00e7\u00e3o foi incompleta e, dado um certo conjunto de circunst\u00e2ncias, as informa\u00e7\u00f5es sobre o estado do reset foram determinadas incorretamente e, no disco, estavam os dados antigos sobre o conte\u00fado do arquivo, caso a solicita\u00e7\u00e3o ca\u00edsse em uma pequena janela de tempo entre duas opera\u00e7\u00f5es de despejo de dados do cache. As opera\u00e7\u00f5es de leitura que otimizam o carregamento de \u00e1reas vazias, nesse momento, podiam ignorar a leitura de parte dos dados, considerando-os vazios, enquanto o programa que trabalha com o arquivo poderia ter feito altera\u00e7\u00f5es nas \u00e1reas vazias antes disso. Como resultado, a aplica\u00e7\u00e3o da utilidade «cp» poderia ter levado \u00e0 cria\u00e7\u00e3o de uma c\u00f3pia contendo \u00e1reas vazias onde n\u00e3o havia no arquivo original. \u0421\u0444\u043e\u0440\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u044b \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0435 \u0432\u044b\u043f\u0443\u0441\u043a\u0438 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 OpenZFS 2.1.14 \u0438 2.2.2, \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u044e\u0449\u0435\u0433\u043e \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044e \u0444\u0430\u0439\u043b\u043e\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b ZFS \u0434\u043b\u044f Linux \u0438 FreeBSD. \u0412 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f\u0445 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0432 \u043a\u043e\u0434\u0435 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u0441\u043e\u0433\u043b\u0430\u0441\u043e\u0432\u0430\u043d\u043d\u043e\u0441\u0442\u0438 \u043a\u044d\u0448\u0430 dnode, \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0430\u044f \u043a \u043f\u043e\u0432\u0440\u0435\u0436\u0434\u0435\u043d\u0438\u044e \u0434\u0430\u043d\u043d\u044b\u0445 \u0432 \u0444\u0430\u0439\u043b\u0430\u0445, \u0441\u043e\u0434\u0435\u0440\u0436\u0430\u0432\u0448\u0438\u0445 \u043f\u0443\u0441\u0442\u044b\u0435 \u043e\u0431\u043b\u0430\u0441\u0442\u0438, \u043f\u0440\u0438 \u0438\u0445 \u043a\u043e\u043f\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0438 \u043f\u043e\u0441\u043b\u0435 \u0432\u043d\u0435\u0441\u0435\u043d\u0438\u044f \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0439. \u0418\u0437\u043d\u0430\u0447\u0430\u043b\u044c\u043d\u043e \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0443 \u043f\u043e\u043f\u044b\u0442\u0430\u043b\u0438\u0441\u044c \u0443\u0441\u0442\u0440\u0430\u043d\u0438\u0442\u044c \u0432 \u0432\u0435\u0440\u0441\u0438\u0438 2.2.1, \u043d\u043e \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u043e\u043a\u0430\u0437\u0430\u043b\u043e\u0441\u044c \u043d\u0435\u044d\u0444\u0444\u0435\u043a\u0442\u0438\u0432\u043d\u043e. \u041e\u0448\u0438\u0431\u043a\u0430 \u0434\u043e\u043b\u0433\u043e\u0435 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-111888","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Atualiza\u00e7\u00e3o do OpenZFS 2.1.14 e 2.2.2 corrigindo um erro que resulta em corrup\u00e7\u00e3o de arquivos | 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Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"