kib 57921f916a Detect and optimize reads from the hole on UFS. ... - Create getblkx(9) variant of getblk(9) which can return error. - Add GB_NOSPARSE flag for getblk()/getblkx() which requests that BMAP was performed before the buffer is created, and EJUSTRETURN returned in case the requested block does not exist. - Make ffs_read() use GB_NOSPARSE to avoid instantiating buffer (and allocating the pages for it), copying from zero_region instead. The end result is less page allocations and buffer recycling when a hole is read, which is important for some benchmarks. Requested and reviewed by: jeff Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 2 weeks Differential revision: https://reviews.freebsd.org/D14917		2018-05-13 09:47:28 +00:00
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ffs	Detect and optimize reads from the hole on UFS.	2018-05-13 09:47:28 +00:00
ufs	Revert r313780 (UFS_ prefix)	2018-03-17 12:59:55 +00:00