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109e376530
The block tracing infrastructure (accessed with blktrace/blkparse) supports the tracing of mapping bios from one device to another. This is currently used when a bio in a partition is mapped to the whole device, when bios are mapped by dm, and for mapping in md/raid5. Other md personalities do not include this tracing yet, so add it. When a read-error is detected we redirect the request to a different device. This could justifiably be seen as a new mapping for the originial bio, or a secondary mapping for the bio that errors. This patch uses the second option. When md is used under dm-raid, the mappings are not traced as we do not have access to the block device number of the parent. Signed-off-by: NeilBrown <neilb@suse.com> Signed-off-by: Shaohua Li <shli@fb.com>
320 lines
7.6 KiB
320 lines
7.6 KiB