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2015-03-31block: fix blk_stack_limits() regression due to lcm() changeMike Snitzer1-0/+11
Linux 3.19 commit 69c953c ("lib/lcm.c: lcm(n,0)=lcm(0,n) is 0, not n") caused blk_stack_limits() to not properly stack queue_limits for stacked devices (e.g. DM). Fix this regression by establishing lcm_not_zero() and switching blk_stack_limits() over to using it. DM uses blk_set_stacking_limits() to establish the initial top-level queue_limits that are then built up based on underlying devices' limits using blk_stack_limits(). In the case of optimal_io_size (io_opt) blk_set_stacking_limits() establishes a default value of 0. With commit 69c953c, lcm(0, n) is no longer n, which compromises proper stacking of the underlying devices' io_opt. Test: $ modprobe scsi_debug dev_size_mb=10 num_tgts=1 opt_blks=1536 $ cat /sys/block/sde/queue/optimal_io_size 786432 $ dmsetup create node --table "0 100 linear /dev/sde 0" Before this fix: $ cat /sys/block/dm-5/queue/optimal_io_size 0 After this fix: $ cat /sys/block/dm-5/queue/optimal_io_size 786432 Signed-off-by: Mike Snitzer <[email protected]> Cc: [email protected] # 3.19+ Acked-by: Martin K. Petersen <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
2015-02-12lib/lcm.c: replace includeRasmus Villemoes1-1/+1
We don't need all the stuff kernel.h pulls in; just compiler.h since export.h doesn't do necessary #includes. This removes more than 100 dependencies. Signed-off-by: Rasmus Villemoes <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2014-12-10lib/lcm.c: lcm(n,0)=lcm(0,n) is 0, not nRasmus Villemoes1-4/+2
Return the mathematically correct answer when an argument is 0. Signed-off-by: Rasmus Villemoes <[email protected]> Cc: Martin K. Petersen <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2014-12-10lib/lcm.c: ensure correct result whenever it fitsRasmus Villemoes1-1/+1
Ensure that lcm(a,b) returns the mathematically correct result, provided it fits in an unsigned long. The current version returns garbage if a*b overflows, even if the final result would fit. Signed-off-by: Rasmus Villemoes <[email protected]> Cc: Martin K. Petersen <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2012-03-07lib: reduce the use of module.h wherever possiblePaul Gortmaker1-1/+1
For files only using THIS_MODULE and/or EXPORT_SYMBOL, map them onto including export.h -- or if the file isn't even using those, then just delete the include. Fix up any implicit include dependencies that were being masked by module.h along the way. Signed-off-by: Paul Gortmaker <[email protected]>
2011-07-25lib/lcm.c: quiet sparse noiseH Hartley Sweeten1-0/+1
The symbol 'lcm' is exported to the kernel (EXPORT_SYMBOL_GPL). Pick up it's definition in <linux/lcm.h> to quiet the sparse noise: warning: symbol 'lcm' was not declared. Should it be static? Signed-off-by: H Hartley Sweeten <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2010-03-15block: Fix overrun in lcm() and move it to libMartin K. Petersen1-0/+15
lcm() was defined to take integer-sized arguments. The supplied arguments are multiplied, however, causing us to overflow given sufficiently large input. That in turn led to incorrect optimal I/O size reporting in some cases (RAID over RAID). Switch lcm() over to unsigned long similar to gcd() and move the function from blk-settings.c to lib. Signed-off-by: Martin K. Petersen <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
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