Date: Mon, 13 Oct 2014 11:00:59 +0000 (UTC) From: Alexander Motin <mav@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r273029 - head/sys/cam/ctl Message-ID: <201410131100.s9DB0xgP076570@svn.freebsd.org>
next in thread | raw e-mail | index | archive | help
Author: mav Date: Mon Oct 13 11:00:58 2014 New Revision: 273029 URL: https://svnweb.freebsd.org/changeset/base/273029 Log: Report physical block size for file-backed LUNs, using vattr.va_blocksize. MFC after: 1 week Modified: head/sys/cam/ctl/ctl_backend_block.c Modified: head/sys/cam/ctl/ctl_backend_block.c ============================================================================== --- head/sys/cam/ctl/ctl_backend_block.c Mon Oct 13 06:51:40 2014 (r273028) +++ head/sys/cam/ctl/ctl_backend_block.c Mon Oct 13 11:00:58 2014 (r273029) @@ -1542,6 +1542,7 @@ ctl_be_block_open_file(struct ctl_be_blo struct ctl_be_block_filedata *file_data; struct ctl_lun_create_params *params; struct vattr vattr; + off_t pss; int error; error = 0; @@ -1590,21 +1591,21 @@ ctl_be_block_open_file(struct ctl_be_blo be_lun->flags |= CTL_BE_BLOCK_LUN_MULTI_THREAD; /* - * XXX KDM vattr.va_blocksize may be larger than 512 bytes here. - * With ZFS, it is 131072 bytes. Block sizes that large don't work - * with disklabel and UFS on FreeBSD at least. Large block sizes - * may not work with other OSes as well. So just export a sector - * size of 512 bytes, which should work with any OS or - * application. Since our backing is a file, any block size will - * work fine for the backing store. + * For files we can use any logical block size. Prefer 512 bytes + * for compatibility reasons. If file's vattr.va_blocksize + * (preferred I/O block size) is bigger and multiple to chosen + * logical block size -- report it as physical block size. */ -#if 0 - be_lun->blocksize= vattr.va_blocksize; -#endif if (params->blocksize_bytes != 0) be_lun->blocksize = params->blocksize_bytes; else be_lun->blocksize = 512; + pss = vattr.va_blocksize / be_lun->blocksize; + if ((pss > 0) && (pss * be_lun->blocksize == vattr.va_blocksize) && + ((pss & (pss - 1)) == 0)) { + be_lun->pblockexp = fls(pss) - 1; + be_lun->pblockoff = 0; + } /* * Sanity check. The media size has to be at least one
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201410131100.s9DB0xgP076570>