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path: root/drivers/md/dm-log-writes.c
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2015-07-29block: add a bi_error field to struct bioChristoph Hellwig
Currently we have two different ways to signal an I/O error on a BIO: (1) by clearing the BIO_UPTODATE flag (2) by returning a Linux errno value to the bi_end_io callback The first one has the drawback of only communicating a single possible error (-EIO), and the second one has the drawback of not beeing persistent when bios are queued up, and are not passed along from child to parent bio in the ever more popular chaining scenario. Having both mechanisms available has the additional drawback of utterly confusing driver authors and introducing bugs where various I/O submitters only deal with one of them, and the others have to add boilerplate code to deal with both kinds of error returns. So add a new bi_error field to store an errno value directly in struct bio and remove the existing mechanisms to clean all this up. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.de> Reviewed-by: NeilBrown <neilb@suse.com> Signed-off-by: Jens Axboe <axboe@fb.com>
2015-05-29dm log writes: use ULL suffix for 64-bit constantsGeert Uytterhoeven
On 32-bit: drivers/md/dm-log-writes.c: In function ‘log_super’: drivers/md/dm-log-writes.c:323: warning: integer constant is too large for ‘long’ type Add a ULL suffix to WRITE_LOG_MAGIC to fix this. Also add a ULL suffix to WRITE_LOG_VERSION as it's stored in a __le64 field. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
2015-04-15dm: add log writes targetJosef Bacik
Introduce a new target that is meant for file system developers to test file system integrity at particular points in the life of a file system. We capture all write requests and associated data and log them to a separate device for later replay. There is a userspace utility to do this replay. The idea behind this is to give file system developers a tool to verify that the file system is always consistent. Signed-off-by: Josef Bacik <jbacik@fb.com> Reviewed-by: Zach Brown <zab@zabbo.net> Signed-off-by: Mike Snitzer <snitzer@redhat.com>