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Linux 5.15 compat: block device readahead #12532
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The 5.15 kernel moved the backing_dev_info structure out of the request queue structure which causes a build failure. Rather than look in the new location for the BDI we instead detect this upstream refactoring by the existance of either the blk_queue_update_readahead() or disk_update_readahead() functions. In either case, there's no longer any reason to manually set the ra_pages value since it will be overridden with a reasonable default (2x the block size) when blk_queue_io_opt() is called. Therefore, we update the compatibility wrapper to do nothing for 5.9 and newer kernels. While it's tempting to do the same for older kernels we want to keep the compatibility code to preserve the existing behavior. Removing it would effectively increase the default readahead to 128k. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
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Looks nice, thanks!
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Looks good. Nice to see builds completed successfully. Thanks!
@ckane would you mind taking a look at this. |
I was able to make this build earlier, but didn't get to test it myself, and now there's a more recent change in Linux that breaks compatibility w/ something else. This looks good to me. |
The 5.15 kernel moved the backing_dev_info structure out of the request queue structure which causes a build failure. Rather than look in the new location for the BDI we instead detect this upstream refactoring by the existance of either the blk_queue_update_readahead() or disk_update_readahead() functions. In either case, there's no longer any reason to manually set the ra_pages value since it will be overridden with a reasonable default (2x the block size) when blk_queue_io_opt() is called. Therefore, we update the compatibility wrapper to do nothing for 5.9 and newer kernels. While it's tempting to do the same for older kernels we want to keep the compatibility code to preserve the existing behavior. Removing it would effectively increase the default readahead to 128k. Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes openzfs#12532
The 5.15 kernel moved the backing_dev_info structure out of the request queue structure which causes a build failure. Rather than look in the new location for the BDI we instead detect this upstream refactoring by the existance of either the blk_queue_update_readahead() or disk_update_readahead() functions. In either case, there's no longer any reason to manually set the ra_pages value since it will be overridden with a reasonable default (2x the block size) when blk_queue_io_opt() is called. Therefore, we update the compatibility wrapper to do nothing for 5.9 and newer kernels. While it's tempting to do the same for older kernels we want to keep the compatibility code to preserve the existing behavior. Removing it would effectively increase the default readahead to 128k. Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes openzfs#12532
The 5.15 kernel moved the backing_dev_info structure out of the request queue structure which causes a build failure. Rather than look in the new location for the BDI we instead detect this upstream refactoring by the existance of either the blk_queue_update_readahead() or disk_update_readahead() functions. In either case, there's no longer any reason to manually set the ra_pages value since it will be overridden with a reasonable default (2x the block size) when blk_queue_io_opt() is called. Therefore, we update the compatibility wrapper to do nothing for 5.9 and newer kernels. While it's tempting to do the same for older kernels we want to keep the compatibility code to preserve the existing behavior. Removing it would effectively increase the default readahead to 128k. Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #12532
The 5.15 kernel moved the backing_dev_info structure out of the request queue structure which causes a build failure. Rather than look in the new location for the BDI we instead detect this upstream refactoring by the existance of either the blk_queue_update_readahead() or disk_update_readahead() functions. In either case, there's no longer any reason to manually set the ra_pages value since it will be overridden with a reasonable default (2x the block size) when blk_queue_io_opt() is called. Therefore, we update the compatibility wrapper to do nothing for 5.9 and newer kernels. While it's tempting to do the same for older kernels we want to keep the compatibility code to preserve the existing behavior. Removing it would effectively increase the default readahead to 128k. Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes openzfs#12532
The 5.15 kernel moved the backing_dev_info structure out of the request queue structure which causes a build failure. Rather than look in the new location for the BDI we instead detect this upstream refactoring by the existance of either the blk_queue_update_readahead() or disk_update_readahead() functions. In either case, there's no longer any reason to manually set the ra_pages value since it will be overridden with a reasonable default (2x the block size) when blk_queue_io_opt() is called. Therefore, we update the compatibility wrapper to do nothing for 5.9 and newer kernels. While it's tempting to do the same for older kernels we want to keep the compatibility code to preserve the existing behavior. Removing it would effectively increase the default readahead to 128k. Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #12532
The 5.15 kernel moved the backing_dev_info structure out of the request queue structure which causes a build failure. Rather than look in the new location for the BDI we instead detect this upstream refactoring by the existance of either the blk_queue_update_readahead() or disk_update_readahead() functions. In either case, there's no longer any reason to manually set the ra_pages value since it will be overridden with a reasonable default (2x the block size) when blk_queue_io_opt() is called. Therefore, we update the compatibility wrapper to do nothing for 5.9 and newer kernels. While it's tempting to do the same for older kernels we want to keep the compatibility code to preserve the existing behavior. Removing it would effectively increase the default readahead to 128k. Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes openzfs#12532
Motivation and Context
Resolve the build failures caused by the 5.15 kernel release cycle starting.
http://build.zfsonlinux.org/builders/Kernel.org%20Built-in%20x86_64%20%28BUILD%29/builds/42957
Description
The 5.15 kernel moved the backing_dev_info structure out of
the request queue structure which causes a build failure.
Rather than look in the new location for the BDI we instead
detect this upstream refactoring by the existence of either
the
blk_queue_update_readahead()
ordisk_update_readahead()
functions. In either case, there's no longer any reason to
manually set the ra_pages value since it will be overridden
with a reasonable default (2x the block size) when
blk_queue_io_opt()
is called.Therefore, we update the compatibility wrapper to do nothing
for 5.9 and newer kernels. While it's tempting to do the
same for older kernels we want to keep the compatibility
code to preserve the existing behavior. Removing it would
effectively increase the default readahead to 128k.
How Has This Been Tested?
Compiled against the v5.14-6779-g477f70cd2a67 kernel.
Types of changes
Checklist:
Signed-off-by
.