X-Git-Url: https://git.whamcloud.com/?a=blobdiff_plain;f=lustre%2Flov%2Flov_offset.c;h=555040084c480b3f36846c81103b4d5eb18e67f1;hb=e66dd92775a547d755846349bfed97d831194f70;hp=d713907e735382f88511a39a4c6d829ee0b64c51;hpb=266d030aa71459fd96e999ac87134194f6b3c5dd;p=fs%2Flustre-release.git diff --git a/lustre/lov/lov_offset.c b/lustre/lov/lov_offset.c index d713907..55504008 100644 --- a/lustre/lov/lov_offset.c +++ b/lustre/lov/lov_offset.c @@ -15,11 +15,7 @@ * * You should have received a copy of the GNU General Public License * version 2 along with this program; If not, see - * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf - * - * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, - * CA 95054 USA or visit www.sun.com if you need additional information or - * have any questions. + * http://www.gnu.org/licenses/gpl-2.0.html * * GPL HEADER END */ @@ -27,11 +23,10 @@ * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. * Use is subject to license terms. * - * Copyright (c) 2012, Intel Corporation. + * Copyright (c) 2012, 2017, Intel Corporation. */ /* * This file is part of Lustre, http://www.lustre.org/ - * Lustre is a trademark of Sun Microsystems, Inc. */ #define DEBUG_SUBSYSTEM S_LOV @@ -42,47 +37,59 @@ #include "lov_internal.h" +u64 stripe_width(struct lov_stripe_md *lsm, unsigned int index) +{ + struct lov_stripe_md_entry *entry = lsm->lsm_entries[index]; + + LASSERT(index < lsm->lsm_entry_count); + + if (lsme_is_dom(entry)) + return entry->lsme_stripe_size; + + return (u64)entry->lsme_stripe_size * entry->lsme_stripe_count; +} + /* compute object size given "stripeno" and the ost size */ -obd_size lov_stripe_size(struct lov_stripe_md *lsm, obd_size ost_size, - int stripeno) +u64 lov_stripe_size(struct lov_stripe_md *lsm, int index, u64 ost_size, + int stripeno) { - unsigned long ssize = lsm->lsm_stripe_size; - unsigned long stripe_size; - obd_off swidth; - obd_size lov_size; - int magic = lsm->lsm_magic; - ENTRY; + u32 ssize = lsm->lsm_entries[index]->lsme_stripe_size; + u32 stripe_size; + u64 swidth; + u64 lov_size; - if (ost_size == 0) - RETURN(0); + ENTRY; - LASSERT(lsm_op_find(magic) != NULL); - lsm_op_find(magic)->lsm_stripe_by_index(lsm, &stripeno, NULL, &swidth); + if (ost_size == 0) + RETURN(0); - /* lov_do_div64(a, b) returns a % b, and a = a / b */ - stripe_size = lov_do_div64(ost_size, ssize); + swidth = stripe_width(lsm, index); + + ost_size = div_u64_rem(ost_size, ssize, &stripe_size); if (stripe_size) lov_size = ost_size * swidth + stripeno * ssize + stripe_size; else lov_size = (ost_size - 1) * swidth + (stripeno + 1) * ssize; - RETURN(lov_size); + RETURN(lov_size); } /** * Compute file level page index by stripe level page offset */ -pgoff_t lov_stripe_pgoff(struct lov_stripe_md *lsm, pgoff_t stripe_index, - int stripe) +pgoff_t lov_stripe_pgoff(struct lov_stripe_md *lsm, int index, + pgoff_t stripe_index, int stripe) { - obd_off offset; + loff_t offset; - offset = lov_stripe_size(lsm, stripe_index << PAGE_CACHE_SHIFT, + offset = lov_stripe_size(lsm, index, + (stripe_index << PAGE_SHIFT) + 1, stripe); - return offset >> PAGE_CACHE_SHIFT; + return offset >> PAGE_SHIFT; } -/* we have an offset in file backed by an lov and want to find out where +/* + * we have an offset in file backed by an lov and want to find out where * that offset lands in our given stripe of the file. for the easy * case where the offset is within the stripe, we just have to scale the * offset down to make it relative to the stripe instead of the lov. @@ -129,46 +136,43 @@ pgoff_t lov_stripe_pgoff(struct lov_stripe_md *lsm, pgoff_t stripe_index, * this function returns < 0 when the offset was "before" the stripe and * was moved forward to the start of the stripe in question; 0 when it * falls in the stripe and no shifting was done; > 0 when the offset - * was outside the stripe and was pulled back to its final byte. */ -int lov_stripe_offset(struct lov_stripe_md *lsm, obd_off lov_off, - int stripeno, obd_off *obdoff) + * was outside the stripe and was pulled back to its final byte. + */ +int lov_stripe_offset(struct lov_stripe_md *lsm, int index, loff_t lov_off, + int stripeno, loff_t *obdoff) { - unsigned long ssize = lsm->lsm_stripe_size; - obd_off stripe_off, this_stripe, swidth; - int magic = lsm->lsm_magic; - int ret = 0; - - if (lov_off == OBD_OBJECT_EOF) { - *obdoff = OBD_OBJECT_EOF; - return 0; - } - - LASSERT(lsm_op_find(magic) != NULL); - - lsm_op_find(magic)->lsm_stripe_by_index(lsm, &stripeno, &lov_off, - &swidth); - - /* lov_do_div64(a, b) returns a % b, and a = a / b */ - stripe_off = lov_do_div64(lov_off, swidth); - - this_stripe = (obd_off)stripeno * ssize; - if (stripe_off < this_stripe) { - stripe_off = 0; - ret = -1; - } else { - stripe_off -= this_stripe; - - if (stripe_off >= ssize) { - stripe_off = ssize; - ret = 1; - } - } - - *obdoff = lov_off * ssize + stripe_off; - return ret; + unsigned long ssize = lsm->lsm_entries[index]->lsme_stripe_size; + u64 stripe_off, this_stripe, swidth; + int ret = 0; + + if (lov_off == OBD_OBJECT_EOF) { + *obdoff = OBD_OBJECT_EOF; + return 0; + } + + swidth = stripe_width(lsm, index); + + lov_off = div64_u64_rem(lov_off, swidth, &stripe_off); + + this_stripe = (u64)stripeno * ssize; + if (stripe_off < this_stripe) { + stripe_off = 0; + ret = -1; + } else { + stripe_off -= this_stripe; + + if (stripe_off >= ssize) { + stripe_off = ssize; + ret = 1; + } + } + + *obdoff = lov_off * ssize + stripe_off; + return ret; } -/* Given a whole-file size and a stripe number, give the file size which +/* + * Given a whole-file size and a stripe number, give the file size which * corresponds to the individual object of that stripe. * * This behaves basically in the same was as lov_stripe_offset, except that @@ -187,93 +191,113 @@ int lov_stripe_offset(struct lov_stripe_md *lsm, obd_off lov_off, * | 0 | 1 | 2 | 0 | 1 | 2 | * --------------------------------------------------------------------- */ -obd_off lov_size_to_stripe(struct lov_stripe_md *lsm, obd_off file_size, - int stripeno) +loff_t lov_size_to_stripe(struct lov_stripe_md *lsm, int index, u64 file_size, + int stripeno) { - unsigned long ssize = lsm->lsm_stripe_size; - obd_off stripe_off, this_stripe, swidth; - int magic = lsm->lsm_magic; - - if (file_size == OBD_OBJECT_EOF) - return OBD_OBJECT_EOF; - - LASSERT(lsm_op_find(magic) != NULL); - lsm_op_find(magic)->lsm_stripe_by_index(lsm, &stripeno, &file_size, - &swidth); - - /* lov_do_div64(a, b) returns a % b, and a = a / b */ - stripe_off = lov_do_div64(file_size, swidth); - - this_stripe = (obd_off)stripeno * ssize; - if (stripe_off < this_stripe) { - /* Move to end of previous stripe, or zero */ - if (file_size > 0) { - file_size--; - stripe_off = ssize; - } else { - stripe_off = 0; - } - } else { - stripe_off -= this_stripe; - - if (stripe_off >= ssize) { - /* Clamp to end of this stripe */ - stripe_off = ssize; - } - } - - return (file_size * ssize + stripe_off); + unsigned long ssize = lsm->lsm_entries[index]->lsme_stripe_size; + u64 stripe_off; + u64 this_stripe; + u64 swidth; + + if (file_size == OBD_OBJECT_EOF) + return OBD_OBJECT_EOF; + + swidth = stripe_width(lsm, index); + + file_size = div64_u64_rem(file_size, swidth, &stripe_off); + + this_stripe = (u64)stripeno * ssize; + if (stripe_off < this_stripe) { + /* Move to end of previous stripe, or zero */ + if (file_size > 0) { + file_size--; + stripe_off = ssize; + } else { + stripe_off = 0; + } + } else { + stripe_off -= this_stripe; + + if (stripe_off >= ssize) { + /* Clamp to end of this stripe */ + stripe_off = ssize; + } + } + + return (file_size * ssize + stripe_off); } -/* given an extent in an lov and a stripe, calculate the extent of the stripe +/* + * given an extent in an lov and a stripe, calculate the extent of the stripe * that is contained within the lov extent. this returns true if the given - * stripe does intersect with the lov extent. */ -int lov_stripe_intersects(struct lov_stripe_md *lsm, int stripeno, - obd_off start, obd_off end, - obd_off *obd_start, obd_off *obd_end) + * stripe does intersect with the lov extent. + * + * Closed interval [@obd_start, @obd_end] will be returned if caller needs them. + */ +int lov_stripe_intersects(struct lov_stripe_md *lsm, int index, int stripeno, + struct lu_extent *ext, u64 *obd_start, u64 *obd_end) { - int start_side, end_side; - - start_side = lov_stripe_offset(lsm, start, stripeno, obd_start); - end_side = lov_stripe_offset(lsm, end, stripeno, obd_end); - - CDEBUG(D_INODE, "["LPU64"->"LPU64"] -> [(%d) "LPU64"->"LPU64" (%d)]\n", - start, end, start_side, *obd_start, *obd_end, end_side); - - /* this stripe doesn't intersect the file extent when neither - * start or the end intersected the stripe and obd_start and - * obd_end got rounded up to the save value. */ - if (start_side != 0 && end_side != 0 && *obd_start == *obd_end) - return 0; - - /* as mentioned in the lov_stripe_offset commentary, end - * might have been shifted in the wrong direction. This - * happens when an end offset is before the stripe when viewed - * through the "mod stripe size" math. we detect it being shifted - * in the wrong direction and touch it up. - * interestingly, this can't underflow since end must be > start - * if we passed through the previous check. - * (should we assert for that somewhere?) */ - if (end_side != 0) - (*obd_end)--; - - return 1; + struct lov_stripe_md_entry *entry = lsm->lsm_entries[index]; + u64 start, end; + int start_side, end_side; + u64 loc_start, loc_end; + + if (!lu_extent_is_overlapped(ext, &entry->lsme_extent)) + return 0; + + if (!obd_start) + obd_start = &loc_start; + if (!obd_end) + obd_end = &loc_end; + + start = max_t(__u64, ext->e_start, entry->lsme_extent.e_start); + end = min_t(__u64, ext->e_end, entry->lsme_extent.e_end); + if (end != OBD_OBJECT_EOF) + end--; + + start_side = lov_stripe_offset(lsm, index, start, stripeno, obd_start); + end_side = lov_stripe_offset(lsm, index, end, stripeno, obd_end); + + CDEBUG(D_INODE, "[%lld->%lld] -> [(%d) %lld->%lld (%d)]\n", + start, end, start_side, *obd_start, *obd_end, end_side); + + /* + * this stripe doesn't intersect the file extent when neither + * start or the end intersected the stripe and obd_start and + * obd_end got rounded up to the save value. + */ + if (start_side != 0 && end_side != 0 && *obd_start == *obd_end) + return 0; + + /* + * as mentioned in the lov_stripe_offset commentary, end + * might have been shifted in the wrong direction. This + * happens when an end offset is before the stripe when viewed + * through the "mod stripe size" math. we detect it being shifted + * in the wrong direction and touch it up. + * interestingly, this can't underflow since end must be > start + * if we passed through the previous check. + * (should we assert for that somewhere?) + */ + if (end_side != 0) + (*obd_end)--; + + return 1; } /* compute which stripe number "lov_off" will be written into */ -int lov_stripe_number(struct lov_stripe_md *lsm, obd_off lov_off) +int lov_stripe_number(struct lov_stripe_md *lsm, int index, u64 lov_off) { - unsigned long ssize = lsm->lsm_stripe_size; - obd_off stripe_off, swidth; - int magic = lsm->lsm_magic; + unsigned long ssize = lsm->lsm_entries[index]->lsme_stripe_size; + u64 stripe_off; + u64 swidth; - LASSERT(lsm_op_find(magic) != NULL); - lsm_op_find(magic)->lsm_stripe_by_offset(lsm, NULL, &lov_off, &swidth); + swidth = stripe_width(lsm, index); - stripe_off = lov_do_div64(lov_off, swidth); + lov_off = div64_u64_rem(lov_off, swidth, &stripe_off); /* Puts stripe_off/ssize result into stripe_off */ - lov_do_div64(stripe_off, ssize); + stripe_off = div_u64(stripe_off, ssize); - return stripe_off; + return (int) stripe_off; }