Date: Mon, 6 Oct 2014 12:54:06 +0000 (UTC) From: Alexander Motin <mav@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r272626 - stable/10/sys/cam/ctl Message-ID: <201410061254.s96Cs6KX065881@svn.freebsd.org>
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Author: mav Date: Mon Oct 6 12:54:06 2014 New Revision: 272626 URL: https://svnweb.freebsd.org/changeset/base/272626 Log: MFC r271503: Implement range checks between UNMAP and READ/WRITE commands. Before this change UNMAP completely blocked other I/Os while running. Now it blocks only colliding ones, slowing down others only due to ZFS locks collisions. Sponsored by: iXsystems, Inc. Modified: stable/10/sys/cam/ctl/ctl.c stable/10/sys/cam/ctl/ctl_ser_table.c Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/cam/ctl/ctl.c ============================================================================== --- stable/10/sys/cam/ctl/ctl.c Mon Oct 6 12:49:07 2014 (r272625) +++ stable/10/sys/cam/ctl/ctl.c Mon Oct 6 12:54:06 2014 (r272626) @@ -392,7 +392,7 @@ static int ctl_inquiry_evpd_bdc(struct c static int ctl_inquiry_evpd_lbp(struct ctl_scsiio *ctsio, int alloc_len); static int ctl_inquiry_evpd(struct ctl_scsiio *ctsio); static int ctl_inquiry_std(struct ctl_scsiio *ctsio); -static int ctl_get_lba_len(union ctl_io *io, uint64_t *lba, uint32_t *len); +static int ctl_get_lba_len(union ctl_io *io, uint64_t *lba, uint64_t *len); static ctl_action ctl_extent_check(union ctl_io *io1, union ctl_io *io2); static ctl_action ctl_check_for_blockage(union ctl_io *pending_io, union ctl_io *ooa_io); @@ -5261,6 +5261,8 @@ ctl_data_submit_done(union ctl_io *io) void ctl_config_write_done(union ctl_io *io) { + uint8_t *buf; + /* * If the IO_CONT flag is set, we need to call the supplied * function to continue processing the I/O, instead of completing @@ -5280,9 +5282,13 @@ ctl_config_write_done(union ctl_io *io) * have data allocated, like write buffer, and commands that have * no data, like start/stop unit, we need to check here. */ - if ((io->io_hdr.flags & CTL_FLAG_DATA_MASK) == CTL_FLAG_DATA_OUT) - free(io->scsiio.kern_data_ptr, M_CTL); + if (io->io_hdr.flags & CTL_FLAG_ALLOCATED) + buf = io->scsiio.kern_data_ptr; + else + buf = NULL; ctl_done(io); + if (buf) + free(buf, M_CTL); } /* @@ -6121,11 +6127,14 @@ ctl_unmap(struct ctl_scsiio *ctsio) return (CTL_RETVAL_COMPLETE); } + mtx_lock(&lun->lun_lock); ptrlen = (struct ctl_ptr_len_flags *) &ctsio->io_hdr.ctl_private[CTL_PRIV_LBA_LEN]; ptrlen->ptr = (void *)buf; ptrlen->len = len; ptrlen->flags = byte2; + ctl_check_blocked(lun); + mtx_unlock(&lun->lun_lock); retval = lun->backend->config_write((union ctl_io *)ctsio); return (retval); @@ -10808,7 +10817,7 @@ ctl_inquiry(struct ctl_scsiio *ctsio) * For known CDB types, parse the LBA and length. */ static int -ctl_get_lba_len(union ctl_io *io, uint64_t *lba, uint32_t *len) +ctl_get_lba_len(union ctl_io *io, uint64_t *lba, uint64_t *len) { if (io->io_hdr.io_type != CTL_IO_SCSI) return (1); @@ -10938,6 +10947,11 @@ ctl_get_lba_len(union ctl_io *io, uint64 *len = scsi_4btoul(cdb->length); break; } + case UNMAP: { + *lba = 0; + *len = UINT64_MAX; + break; + } default: return (1); break; /* NOTREACHED */ @@ -10947,7 +10961,7 @@ ctl_get_lba_len(union ctl_io *io, uint64 } static ctl_action -ctl_extent_check_lba(uint64_t lba1, uint32_t len1, uint64_t lba2, uint32_t len2) +ctl_extent_check_lba(uint64_t lba1, uint64_t len1, uint64_t lba2, uint64_t len2) { uint64_t endlba1, endlba2; @@ -10961,19 +10975,53 @@ ctl_extent_check_lba(uint64_t lba1, uint return (CTL_ACTION_BLOCK); } +static int +ctl_extent_check_unmap(union ctl_io *io, uint64_t lba2, uint64_t len2) +{ + struct ctl_ptr_len_flags *ptrlen; + struct scsi_unmap_desc *buf, *end, *range; + uint64_t lba; + uint32_t len; + + /* If not UNMAP -- go other way. */ + if (io->io_hdr.io_type != CTL_IO_SCSI || + io->scsiio.cdb[0] != UNMAP) + return (CTL_ACTION_ERROR); + + /* If UNMAP without data -- block and wait for data. */ + ptrlen = (struct ctl_ptr_len_flags *) + &io->io_hdr.ctl_private[CTL_PRIV_LBA_LEN]; + if ((io->io_hdr.flags & CTL_FLAG_ALLOCATED) == 0 || + ptrlen->ptr == NULL) + return (CTL_ACTION_BLOCK); + + /* UNMAP with data -- check for collision. */ + buf = (struct scsi_unmap_desc *)ptrlen->ptr; + end = buf + ptrlen->len / sizeof(*buf); + for (range = buf; range < end; range++) { + lba = scsi_8btou64(range->lba); + len = scsi_4btoul(range->length); + if ((lba < lba2 + len2) && (lba + len > lba2)) + return (CTL_ACTION_BLOCK); + } + return (CTL_ACTION_PASS); +} + static ctl_action ctl_extent_check(union ctl_io *io1, union ctl_io *io2) { uint64_t lba1, lba2; - uint32_t len1, len2; + uint64_t len1, len2; int retval; - retval = ctl_get_lba_len(io1, &lba1, &len1); - if (retval != 0) + if (ctl_get_lba_len(io1, &lba1, &len1) != 0) return (CTL_ACTION_ERROR); - retval = ctl_get_lba_len(io2, &lba2, &len2); - if (retval != 0) + retval = ctl_extent_check_unmap(io2, lba1, len1); + if (retval != CTL_ACTION_ERROR) + return (retval); + + if (ctl_get_lba_len(io2, &lba2, &len2) != 0) return (CTL_ACTION_ERROR); return (ctl_extent_check_lba(lba1, len1, lba2, len2)); @@ -12582,7 +12630,7 @@ ctl_cmd_pattern_match(struct ctl_scsiio */ if (filtered_pattern & CTL_LUN_PAT_RANGE) { uint64_t lba1; - uint32_t len1; + uint64_t len1; ctl_action action; int retval; Modified: stable/10/sys/cam/ctl/ctl_ser_table.c ============================================================================== --- stable/10/sys/cam/ctl/ctl_ser_table.c Mon Oct 6 12:49:07 2014 (r272625) +++ stable/10/sys/cam/ctl/ctl_ser_table.c Mon Oct 6 12:54:06 2014 (r272626) @@ -64,7 +64,7 @@ ctl_serialize_table[CTL_SERIDX_COUNT][CT /*TUR */{ pS, pS, pS, pS, bK, bK, bK, pS, pS, bK, pS, bK, bK}, /*READ */{ pS, pS, xT, bK, bK, bK, bK, pS, pS, bK, pS, bK, bK}, /*WRITE */{ pS, xT, xT, bK, bK, bK, bK, pS, pS, bK, pS, bK, bK}, -/*UNMAP */{ pS, bK, bK, pS, bK, bK, bK, pS, pS, bK, pS, bK, bK}, +/*UNMAP */{ pS, xT, xT, pS, bK, bK, bK, pS, pS, bK, pS, bK, bK}, /*MD_SNS */{ bK, bK, bK, bK, pS, bK, bK, pS, pS, bK, pS, bK, bK}, /*MD_SEL */{ bK, bK, bK, bK, bK, bK, bK, pS, pS, bK, pS, bK, bK}, /*RQ_SNS */{ pS, pS, pS, pS, pS, pS, bK, pS, pS, bK, pS, bK, bK},
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