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BranchCommit messageAuthorAge
archive/unc-master-3.0P-FP: fix BUG_ON releated to priority inheritanceBjoern Brandenburg13 years
archived-2013.1uncachedev: mmap memory that is not cached by CPUsGlenn Elliott12 years
archived-private-masterMerge branch 'wip-2.6.34' into old-private-masterAndrea Bastoni15 years
archived-semi-partMerge branch 'wip-semi-part' of ssh://cvs/cvs/proj/litmus/repo/litmus2010 int...Andrea Bastoni15 years
demoFurther refinementsJonathan Herman14 years
ecrts-pgm-finalMerge branch 'wip-ecrts14-pgm' of ssh://rtsrv.cs.unc.edu/home/litmus/litmus-r...Glenn Elliott12 years
ecrts14-pgm-finalMerge branch 'wip-ecrts14-pgm' of ssh://rtsrv.cs.unc.edu/home/litmus/litmus-r...Glenn Elliott12 years
gpusync-rtss12Final GPUSync implementation.Glenn Elliott12 years
gpusync/stagingRename IKGLP R2DGLP.Glenn Elliott12 years
linux-tipMerge branch 'slab/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/p...Linus Torvalds15 years
litmus2008-patch-seriesadd i386 feather-trace implementationBjoern B. Brandenburg16 years
masterPSN-EDF: use inferred_sporadic_job_release_atBjoern Brandenburg9 years
pgmmake it compileGlenn Elliott12 years
prop/litmus-signalsInfrastructure for Litmus signals.Glenn Elliott13 years
prop/robust-tie-breakFixed bug in edf_higher_prio().Glenn Elliott13 years
stagingFix tracepoint compilation errorFelipe Cerqueira13 years
test9/23/2016Namhoon Kim9 years
tracing-develTest kernel tracing events capabilitiesAndrea Bastoni16 years
v2.6.34-with-arm-patchessmsc911x: Add spinlocks around registers accessCatalin Marinas15 years
v2015.1Add ARM syscall def for get_current_budgetBjoern Brandenburg10 years
wip-2011.2-bbbLitmus core: simplify np-section protocolBjoern B. Brandenburg14 years
wip-2011.2-bbb-traceRefactor sched_trace_log_message() -> debug_trace_log_message()Andrea Bastoni14 years
wip-2012.3-gpuSOBLIV draining support for C-EDF.Glenn Elliott12 years
wip-2012.3-gpu-preportpick up last C-RM fileGlenn Elliott12 years
wip-2012.3-gpu-rtss13Fix critical bug in GPU tracker.Glenn Elliott12 years
wip-2012.3-gpu-sobliv-budget-w-ksharkProper sobliv draining and many bug fixes.Glenn Elliott12 years
wip-aedzl-finalMake it easier to compile AEDZL interfaces in liblitmus.Glenn Elliott15 years
wip-aedzl-revisedAdd sched_trace data for Apative EDZLGlenn Elliott15 years
wip-arbit-deadlineFix compilation bug.Glenn Elliott13 years
wip-aux-tasksDescription of refined aux task inheritance.Glenn Elliott13 years
wip-bbbGSN-EDF & Core: improve debug TRACE'ing for NP sectionsBjoern B. Brandenburg14 years
wip-bbb-prio-donuse correct timestampBjoern B. Brandenburg14 years
wip-better-breakImplement hash-based EDF tie-breaking.Glenn Elliott13 years
wip-binary-heapMake C-EDF work with simplified binheap_deleteGlenn Elliott13 years
wip-budgetAdded support for choices in budget policy enforcement.Glenn Elliott15 years
wip-colorSummarize schedulability with final recordJonathan Herman13 years
wip-color-jlhsched_color: Fixed two bugs causing crashing on experiment restart and a rare...Jonathan Herman13 years
wip-d10-hz1000Enable HZ=1000 on District 10Bjoern B. Brandenburg15 years
wip-default-clusteringFeature: Make default C-EDF clustering compile-time configurable.Glenn Elliott15 years
wip-dissipation-jericksoUpdate from 2.6.36 to 2.6.36.4Jeremy Erickson11 years
wip-dissipation2-jericksoUpdate 2.6.36 to 2.6.36.4Jeremy Erickson11 years
wip-ecrts14-pgmMerge branch 'wip-ecrts14-pgm' of ssh://rtsrv.cs.unc.edu/home/litmus/litmus-r...Glenn Elliott12 years
wip-edf-hsblast tested versionJonathan Herman14 years
wip-edf-osLookup table EDF-osJeremy Erickson12 years
wip-edf-tie-breakMerge branch 'wip-edf-tie-break' of ssh://rtsrv.cs.unc.edu/home/litmus/litmus...Glenn Elliott13 years
wip-edzl-critiqueUse hr_timer's active checks instead of having own flag.Glenn Elliott15 years
wip-edzl-finalImplementation of the EDZL scheduler.Glenn Elliott15 years
wip-edzl-revisedClean up comments.Glenn Elliott15 years
wip-eventsAdded support for tracing arbitrary actions.Jonathan Herman15 years
wip-extra-debugDBG: add additional tracingBjoern B. Brandenburg15 years
wip-fix-switch-jericksoAttempt to fix race condition with plugin switchingJeremy Erickson15 years
wip-fix3sched: show length of runqueue clock deactivation in /proc/sched_debugBjoern B. Brandenburg15 years
wip-fmlp-dequeueImprove FMLP queue management.Glenn Elliott14 years
wip-ft-irq-flagFeather-Trace: keep track of interrupt-related interference.Bjoern B. Brandenburg14 years
wip-gpu-cleanupEnable sched_trace log injection from userspaceGlenn Elliott13 years
wip-gpu-interruptsRemove option for threading of all softirqs.Glenn Elliott14 years
wip-gpu-rtas12Generalized GPU cost predictors + EWMA. (untested)Glenn Elliott13 years
wip-gpu-rtss12Final GPUSync implementation.Glenn Elliott13 years
wip-gpu-rtss12-srpexperimental changes to support GPUs under SRPGlenn Elliott13 years
wip-gpusync-mergeCleanup priority tracking for budget enforcement.Glenn Elliott12 years
wip-ikglpMove RSM and IKGLP imp. to own .c filesGlenn Elliott13 years
wip-k-fmlpMerge branch 'mpi-master' into wip-k-fmlpGlenn Elliott14 years
wip-kernel-coloringAdded recolor syscallNamhoon Kim7 years
wip-kernthreadsKludge work-queue processing into klitirqd.Glenn Elliott15 years
wip-klmirqd-to-auxAllow klmirqd threads to be given names.Glenn Elliott13 years
wip-ksharkMerge branch 'mpi-staging' into wip-ksharkJonathan Herman13 years
wip-litmus-3.2Merge commit 'v3.2' into litmus-stagingAndrea Bastoni13 years
wip-litmus2011.2Cleanup: Coding conformance for affinity stuff.Glenn Elliott14 years
wip-litmus3.0-2011.2Feather-Trace: keep track of interrupt-related interference.Bjoern B. Brandenburg14 years
wip-master-2.6.33-rtAvoid deadlock when switching task policy to BACKGROUND (ugly)Andrea Bastoni15 years
wip-mcRemoved ARM-specific hacks which disabled less common mixed-criticality featu...Jonathan Herman12 years
wip-mc-bipasaMC-EDF addedbipasa chattopadhyay13 years
wip-mc-jericksoSplit C/D queuesJeremy Erickson15 years
wip-mc2-cache-slackManually patched mc^2 related codeMing Yang10 years
wip-mcrit-maccosmeticMac Mollison15 years
wip-merge-3.0Prevent Linux to send IPI and queue tasks on remote CPUs.Andrea Bastoni14 years
wip-merge-v3.0Prevent Linux to send IPI and queue tasks on remote CPUs.Andrea Bastoni14 years
wip-migration-affinityNULL affinity dereference in C-EDF.Glenn Elliott14 years
wip-mmap-uncacheshare branch with othersGlenn Elliott13 years
wip-modechangeRTSS 2017 submissionNamhoon Kim8 years
wip-nested-lockingAppears to be working.Bryan Ward12 years
wip-omlp-gedfFirst implementation of G-OMLP.Glenn Elliott15 years
wip-paiSome cleanup of PAIGlenn Elliott14 years
wip-percore-lib9/21/2016Namhoon Kim9 years
wip-performanceCONFIG_DONT_PREEMPT_ON_TIE: Don't preeempt a scheduled task on priority tie.Glenn Elliott14 years
wip-pgmAdd PGM support to C-FLGlenn Elliott12 years
wip-pgm-splitFirst draft of C-FL-splitNamhoon Kim12 years
wip-pm-ovdAdd preemption-and-migration overhead tracing supportAndrea Bastoni15 years
wip-prio-inhP-EDF updated to use the generic pi framework.Glenn Elliott15 years
wip-prioq-dglBUG FIX: Support DGLs with PRIOQ_MUTEXGlenn Elliott13 years
wip-refactored-gedfGeneralizd architecture for GEDF-style scheduelrs to reduce code redundancy.Glenn Elliott15 years
wip-release-master-fixbugfix: release master CPU must signal task was pickedBjoern B. Brandenburg14 years
wip-robust-tie-breakEDF priority tie-breaks.Glenn Elliott13 years
wip-rt-ksharkMove task time accounting into the complete_job method.Jonathan Herman13 years
wip-rtas12-pgmScheduling of PGM jobs.Glenn Elliott13 years
wip-semi-partFix compile error with newer GCCJeremy Erickson12 years
wip-semi-part-edfos-jericksoUse initial CPU set by clientJeremy Erickson12 years
wip-shared-libTODO: Fix condition checks in replicate_page_move_mapping()Namhoon Kim9 years
wip-shared-lib2RTAS 2017 Submission ver.Namhoon Kim9 years
wip-shared-memInitial commit for shared libraryNamhoon Kim9 years
wip-splitting-jericksoFix release behaviorJeremy Erickson13 years
wip-splitting-omlp-jericksoBjoern's Dissertation Code with Priority DonationJeremy Erickson13 years
wip-stage-binheapAn efficient binary heap implementation.Glenn Elliott13 years
wip-sun-portDynamic memory allocation and clean exit for FeatherTraceChristopher Kenna15 years
wip-timer-tracebugfix: C-EDF, clear scheduled field of the correct CPU upon task_exitAndrea Bastoni15 years
wip-tracepointsAdd kernel-style events for sched_trace_XXX() functionsAndrea Bastoni14 years
 
TagDownloadAuthorAge
2015.1commit 8e51b37822...Bjoern Brandenburg10 years
2013.1commit bcaacec1ca...Glenn Elliott12 years
2012.3commit c158b5fbe4...Jonathan Herman13 years
2012.2commit b53c479a0f...Glenn Elliott13 years
2012.1commit 83b11ea1c6...Bjoern B. Brandenburg14 years
rtas12-mc-beta-expcommit 8e236ee20f...Christopher Kenna14 years
2011.1commit d11808b5c6...Christopher Kenna15 years
v2.6.37-rc4commit e8a7e48bb2...Linus Torvalds15 years
v2.6.37-rc3commit 3561d43fd2...Linus Torvalds15 years
v2.6.37-rc2commit e53beacd23...Linus Torvalds15 years
v2.6.37-rc1commit c8ddb2713c...Linus Torvalds15 years
v2.6.36commit f6f94e2ab1...Linus Torvalds15 years
2010.2commit 5c5456402d...Bjoern B. Brandenburg15 years
v2.6.36-rc8commit cd07202cc8...Linus Torvalds15 years
v2.6.36-rc7commit cb655d0f3d...Linus Torvalds15 years
v2.6.36-rc6commit 899611ee7d...Linus Torvalds15 years
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2010.1commit 7c1ff4c544...Andrea Bastoni15 years
v2.6.34commit e40152ee1e...Linus Torvalds15 years
v2.6.33.4commit 4640b4e7d9...Greg Kroah-Hartman15 years
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v2.6.15-rc3commit 624f54be20...Linus Torvalds20 years
v2.6.15-rc2commit 3bedff1d73...Linus Torvalds20 years
v2.6.15-rc1commit cd52d1ee9a...Linus Torvalds20 years
v2.6.14commit 741b2252a5...Linus Torvalds20 years
v2.6.14-rc5commit 93918e9afc...Linus Torvalds20 years
v2.6.14-rc4commit 907a426179...Linus Torvalds20 years
v2.6.14-rc3commit 1c9426e8a5...Linus Torvalds20 years
v2.6.14-rc2commit 676d55ae30...Linus Torvalds20 years
v2.6.14-rc1commit 2f4ba45a75...Linus Torvalds20 years
v2.6.13commit 02b3e4e2d7...Linus Torvalds20 years
v2.6.13-rc7commit 0572e3da3f...Linus Torvalds20 years
v2.6.13-rc6commit 6fc32179de...Linus Torvalds20 years
v2.6.13-rc5commit 9a351e30d7...Linus Torvalds20 years
v2.6.13-rc4commit 6395352334...Linus Torvalds20 years
v2.6.11tree c39ae07f39...
v2.6.11-treetree c39ae07f39...
v2.6.12commit 9ee1c939d1...
v2.6.12-rc2commit 1da177e4c3...
v2.6.12-rc3commit a2755a80f4...
v2.6.12-rc4commit 88d7bd8cb9...
v2.6.12-rc5commit 2a24ab628a...
v2.6.12-rc6commit 7cef5677ef...
v2.6.13-rc1commit 4c91aedb75...
v2.6.13-rc2commit a18bcb7450...
v2.6.13-rc3commit c32511e271...
)&buf, &pos, sizeof(struct gfs2_rindex)); if (error != sizeof(struct gfs2_rindex)) return (error == 0) ? 1 : error; rgd = kmem_cache_zalloc(gfs2_rgrpd_cachep, GFP_NOFS); error = -ENOMEM; if (!rgd) return error; rgd->rd_sbd = sdp; rgd->rd_addr = be64_to_cpu(buf.ri_addr); rgd->rd_length = be32_to_cpu(buf.ri_length); rgd->rd_data0 = be64_to_cpu(buf.ri_data0); rgd->rd_data = be32_to_cpu(buf.ri_data); rgd->rd_bitbytes = be32_to_cpu(buf.ri_bitbytes); error = compute_bitstructs(rgd); if (error) goto fail; error = gfs2_glock_get(sdp, rgd->rd_addr, &gfs2_rgrp_glops, CREATE, &rgd->rd_gl); if (error) goto fail; rgd->rd_gl->gl_object = rgd; rgd->rd_flags &= ~GFS2_RDF_UPTODATE; if (rgd->rd_data > sdp->sd_max_rg_data) sdp->sd_max_rg_data = rgd->rd_data; spin_lock(&sdp->sd_rindex_spin); rgd_insert(rgd); sdp->sd_rgrps++; spin_unlock(&sdp->sd_rindex_spin); return error; fail: kfree(rgd->rd_bits); kmem_cache_free(gfs2_rgrpd_cachep, rgd); return error; } /** * gfs2_ri_update - Pull in a new resource index from the disk * @ip: pointer to the rindex inode * * Returns: 0 on successful update, error code otherwise */ static int gfs2_ri_update(struct gfs2_inode *ip) { struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); struct inode *inode = &ip->i_inode; struct file_ra_state ra_state; int error; file_ra_state_init(&ra_state, inode->i_mapping); do { error = read_rindex_entry(ip, &ra_state); } while (error == 0); if (error < 0) return error; sdp->sd_rindex_uptodate = 1; return 0; } /** * gfs2_rindex_update - Update the rindex if required * @sdp: The GFS2 superblock * * We grab a lock on the rindex inode to make sure that it doesn't * change whilst we are performing an operation. We keep this lock * for quite long periods of time compared to other locks. This * doesn't matter, since it is shared and it is very, very rarely * accessed in the exclusive mode (i.e. only when expanding the filesystem). * * This makes sure that we're using the latest copy of the resource index * special file, which might have been updated if someone expanded the * filesystem (via gfs2_grow utility), which adds new resource groups. * * Returns: 0 on succeess, error code otherwise */ int gfs2_rindex_update(struct gfs2_sbd *sdp) { struct gfs2_inode *ip = GFS2_I(sdp->sd_rindex); struct gfs2_glock *gl = ip->i_gl; struct gfs2_holder ri_gh; int error = 0; /* Read new copy from disk if we don't have the latest */ if (!sdp->sd_rindex_uptodate) { mutex_lock(&sdp->sd_rindex_mutex); error = gfs2_glock_nq_init(gl, LM_ST_SHARED, 0, &ri_gh); if (error) return error; if (!sdp->sd_rindex_uptodate) error = gfs2_ri_update(ip); gfs2_glock_dq_uninit(&ri_gh); mutex_unlock(&sdp->sd_rindex_mutex); } return error; } static void gfs2_rgrp_in(struct gfs2_rgrpd *rgd, const void *buf) { const struct gfs2_rgrp *str = buf; u32 rg_flags; rg_flags = be32_to_cpu(str->rg_flags); rg_flags &= ~GFS2_RDF_MASK; rgd->rd_flags &= GFS2_RDF_MASK; rgd->rd_flags |= rg_flags; rgd->rd_free = be32_to_cpu(str->rg_free); rgd->rd_dinodes = be32_to_cpu(str->rg_dinodes); rgd->rd_igeneration = be64_to_cpu(str->rg_igeneration); } static void gfs2_rgrp_out(struct gfs2_rgrpd *rgd, void *buf) { struct gfs2_rgrp *str = buf; str->rg_flags = cpu_to_be32(rgd->rd_flags & ~GFS2_RDF_MASK); str->rg_free = cpu_to_be32(rgd->rd_free); str->rg_dinodes = cpu_to_be32(rgd->rd_dinodes); str->__pad = cpu_to_be32(0); str->rg_igeneration = cpu_to_be64(rgd->rd_igeneration); memset(&str->rg_reserved, 0, sizeof(str->rg_reserved)); } /** * gfs2_rgrp_go_lock - Read in a RG's header and bitmaps * @rgd: the struct gfs2_rgrpd describing the RG to read in * * Read in all of a Resource Group's header and bitmap blocks. * Caller must eventually call gfs2_rgrp_relse() to free the bitmaps. * * Returns: errno */ int gfs2_rgrp_go_lock(struct gfs2_holder *gh) { struct gfs2_rgrpd *rgd = gh->gh_gl->gl_object; struct gfs2_sbd *sdp = rgd->rd_sbd; struct gfs2_glock *gl = rgd->rd_gl; unsigned int length = rgd->rd_length; struct gfs2_bitmap *bi; unsigned int x, y; int error; for (x = 0; x < length; x++) { bi = rgd->rd_bits + x; error = gfs2_meta_read(gl, rgd->rd_addr + x, 0, &bi->bi_bh); if (error) goto fail; } for (y = length; y--;) { bi = rgd->rd_bits + y; error = gfs2_meta_wait(sdp, bi->bi_bh); if (error) goto fail; if (gfs2_metatype_check(sdp, bi->bi_bh, y ? GFS2_METATYPE_RB : GFS2_METATYPE_RG)) { error = -EIO; goto fail; } } if (!(rgd->rd_flags & GFS2_RDF_UPTODATE)) { for (x = 0; x < length; x++) clear_bit(GBF_FULL, &rgd->rd_bits[x].bi_flags); gfs2_rgrp_in(rgd, (rgd->rd_bits[0].bi_bh)->b_data); rgd->rd_flags |= (GFS2_RDF_UPTODATE | GFS2_RDF_CHECK); rgd->rd_free_clone = rgd->rd_free; } return 0; fail: while (x--) { bi = rgd->rd_bits + x; brelse(bi->bi_bh); bi->bi_bh = NULL; gfs2_assert_warn(sdp, !bi->bi_clone); } return error; } /** * gfs2_rgrp_go_unlock - Release RG bitmaps read in with gfs2_rgrp_bh_get() * @rgd: the struct gfs2_rgrpd describing the RG to read in * */ void gfs2_rgrp_go_unlock(struct gfs2_holder *gh) { struct gfs2_rgrpd *rgd = gh->gh_gl->gl_object; int x, length = rgd->rd_length; for (x = 0; x < length; x++) { struct gfs2_bitmap *bi = rgd->rd_bits + x; brelse(bi->bi_bh); bi->bi_bh = NULL; } } void gfs2_rgrp_send_discards(struct gfs2_sbd *sdp, u64 offset, struct buffer_head *bh, const struct gfs2_bitmap *bi) { struct super_block *sb = sdp->sd_vfs; struct block_device *bdev = sb->s_bdev; const unsigned int sects_per_blk = sdp->sd_sb.sb_bsize / bdev_logical_block_size(sb->s_bdev); u64 blk; sector_t start = 0; sector_t nr_sects = 0; int rv; unsigned int x; for (x = 0; x < bi->bi_len; x++) { const u8 *orig = bh->b_data + bi->bi_offset + x; const u8 *clone = bi->bi_clone + bi->bi_offset + x; u8 diff = ~(*orig | (*orig >> 1)) & (*clone | (*clone >> 1)); diff &= 0x55; if (diff == 0) continue; blk = offset + ((bi->bi_start + x) * GFS2_NBBY); blk *= sects_per_blk; /* convert to sectors */ while(diff) { if (diff & 1) { if (nr_sects == 0) goto start_new_extent; if ((start + nr_sects) != blk) { rv = blkdev_issue_discard(bdev, start, nr_sects, GFP_NOFS, 0); if (rv) goto fail; nr_sects = 0; start_new_extent: start = blk; } nr_sects += sects_per_blk; } diff >>= 2; blk += sects_per_blk; } } if (nr_sects) { rv = blkdev_issue_discard(bdev, start, nr_sects, GFP_NOFS, 0); if (rv) goto fail; } return; fail: fs_warn(sdp, "error %d on discard request, turning discards off for this filesystem", rv); sdp->sd_args.ar_discard = 0; } /** * gfs2_alloc_get - get the struct gfs2_alloc structure for an inode * @ip: the incore GFS2 inode structure * * Returns: the struct gfs2_alloc */ struct gfs2_alloc *gfs2_alloc_get(struct gfs2_inode *ip) { struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); int error; BUG_ON(ip->i_alloc != NULL); ip->i_alloc = kzalloc(sizeof(struct gfs2_alloc), GFP_NOFS); error = gfs2_rindex_update(sdp); if (error) fs_warn(sdp, "rindex update returns %d\n", error); return ip->i_alloc; } /** * try_rgrp_fit - See if a given reservation will fit in a given RG * @rgd: the RG data * @ip: the inode * * If there's room for the requested blocks to be allocated from the RG: * * Returns: 1 on success (it fits), 0 on failure (it doesn't fit) */ static int try_rgrp_fit(const struct gfs2_rgrpd *rgd, const struct gfs2_inode *ip) { const struct gfs2_alloc *al = ip->i_alloc; if (rgd->rd_flags & (GFS2_RGF_NOALLOC | GFS2_RDF_ERROR)) return 0; if (rgd->rd_free_clone >= al->al_requested) return 1; return 0; } /** * try_rgrp_unlink - Look for any unlinked, allocated, but unused inodes * @rgd: The rgrp * * Returns: 0 if no error * The inode, if one has been found, in inode. */ static void try_rgrp_unlink(struct gfs2_rgrpd *rgd, u64 *last_unlinked, u64 skip) { u32 goal = 0, block; u64 no_addr; struct gfs2_sbd *sdp = rgd->rd_sbd; unsigned int n; struct gfs2_glock *gl; struct gfs2_inode *ip; int error; int found = 0; while (goal < rgd->rd_data) { down_write(&sdp->sd_log_flush_lock); n = 1; block = rgblk_search(rgd, goal, GFS2_BLKST_UNLINKED, GFS2_BLKST_UNLINKED, &n); up_write(&sdp->sd_log_flush_lock); if (block == BFITNOENT) break; /* rgblk_search can return a block < goal, so we need to keep it marching forward. */ no_addr = block + rgd->rd_data0; goal = max(block + 1, goal + 1); if (*last_unlinked != NO_BLOCK && no_addr <= *last_unlinked) continue; if (no_addr == skip) continue; *last_unlinked = no_addr; error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &gl); if (error) continue; /* If the inode is already in cache, we can ignore it here * because the existing inode disposal code will deal with * it when all refs have gone away. Accessing gl_object like * this is not safe in general. Here it is ok because we do * not dereference the pointer, and we only need an approx * answer to whether it is NULL or not. */ ip = gl->gl_object; if (ip || queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0) gfs2_glock_put(gl); else found++; /* Limit reclaim to sensible number of tasks */ if (found > NR_CPUS) return; } rgd->rd_flags &= ~GFS2_RDF_CHECK; return; } /** * get_local_rgrp - Choose and lock a rgrp for allocation * @ip: the inode to reserve space for * @rgp: the chosen and locked rgrp * * Try to acquire rgrp in way which avoids contending with others. * * Returns: errno */ static int get_local_rgrp(struct gfs2_inode *ip, u64 *last_unlinked) { struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); struct gfs2_rgrpd *rgd, *begin = NULL; struct gfs2_alloc *al = ip->i_alloc; int error, rg_locked; int loops = 0; if (ip->i_rgd && rgrp_contains_block(ip->i_rgd, ip->i_goal)) rgd = begin = ip->i_rgd; else rgd = begin = gfs2_blk2rgrpd(sdp, ip->i_goal); if (rgd == NULL) return -EBADSLT; while (loops < 3) { rg_locked = 0; if (gfs2_glock_is_locked_by_me(rgd->rd_gl)) { rg_locked = 1; error = 0; } else { error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, LM_FLAG_TRY, &al->al_rgd_gh); } switch (error) { case 0: if (try_rgrp_fit(rgd, ip)) { ip->i_rgd = rgd; return 0; } if (rgd->rd_flags & GFS2_RDF_CHECK) try_rgrp_unlink(rgd, last_unlinked, ip->i_no_addr); if (!rg_locked) gfs2_glock_dq_uninit(&al->al_rgd_gh); /* fall through */ case GLR_TRYFAILED: rgd = gfs2_rgrpd_get_next(rgd); if (rgd == begin) loops++; break; default: return error; } } return -ENOSPC; } /** * gfs2_inplace_reserve - Reserve space in the filesystem * @ip: the inode to reserve space for * * Returns: errno */ int gfs2_inplace_reserve(struct gfs2_inode *ip) { struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); struct gfs2_alloc *al = ip->i_alloc; int error = 0; u64 last_unlinked = NO_BLOCK; int tries = 0; if (gfs2_assert_warn(sdp, al->al_requested)) return -EINVAL; do { error = get_local_rgrp(ip, &last_unlinked); if (error != -ENOSPC) break; /* Check that fs hasn't grown if writing to rindex */ if (ip == GFS2_I(sdp->sd_rindex) && !sdp->sd_rindex_uptodate) { error = gfs2_ri_update(ip); if (error) break; continue; } /* Flushing the log may release space */ gfs2_log_flush(sdp, NULL); } while (tries++ < 3); return error; } /** * gfs2_inplace_release - release an inplace reservation * @ip: the inode the reservation was taken out on * * Release a reservation made by gfs2_inplace_reserve(). */ void gfs2_inplace_release(struct gfs2_inode *ip) { struct gfs2_alloc *al = ip->i_alloc; if (al->al_rgd_gh.gh_gl) gfs2_glock_dq_uninit(&al->al_rgd_gh); } /** * gfs2_get_block_type - Check a block in a RG is of given type * @rgd: the resource group holding the block * @block: the block number * * Returns: The block type (GFS2_BLKST_*) */ static unsigned char gfs2_get_block_type(struct gfs2_rgrpd *rgd, u64 block) { struct gfs2_bitmap *bi = NULL; u32 length, rgrp_block, buf_block; unsigned int buf; unsigned char type; length = rgd->rd_length; rgrp_block = block - rgd->rd_data0; for (buf = 0; buf < length; buf++) { bi = rgd->rd_bits + buf; if (rgrp_block < (bi->bi_start + bi->bi_len) * GFS2_NBBY) break; } gfs2_assert(rgd->rd_sbd, buf < length); buf_block = rgrp_block - bi->bi_start * GFS2_NBBY; type = gfs2_testbit(rgd, bi->bi_bh->b_data + bi->bi_offset, bi->bi_len, buf_block); return type; } /** * rgblk_search - find a block in @old_state, change allocation * state to @new_state * @rgd: the resource group descriptor * @goal: the goal block within the RG (start here to search for avail block) * @old_state: GFS2_BLKST_XXX the before-allocation state to find * @new_state: GFS2_BLKST_XXX the after-allocation block state * @n: The extent length * * Walk rgrp's bitmap to find bits that represent a block in @old_state. * Add the found bitmap buffer to the transaction. * Set the found bits to @new_state to change block's allocation state. * * This function never fails, because we wouldn't call it unless we * know (from reservation results, etc.) that a block is available. * * Scope of @goal and returned block is just within rgrp, not the whole * filesystem. * * Returns: the block number allocated */ static u32 rgblk_search(struct gfs2_rgrpd *rgd, u32 goal, unsigned char old_state, unsigned char new_state, unsigned int *n) { struct gfs2_bitmap *bi = NULL; const u32 length = rgd->rd_length; u32 blk = BFITNOENT; unsigned int buf, x; const unsigned int elen = *n; const u8 *buffer = NULL; *n = 0; /* Find bitmap block that contains bits for goal block */ for (buf = 0; buf < length; buf++) { bi = rgd->rd_bits + buf; /* Convert scope of "goal" from rgrp-wide to within found bit block */ if (goal < (bi->bi_start + bi->bi_len) * GFS2_NBBY) { goal -= bi->bi_start * GFS2_NBBY; goto do_search; } } buf = 0; goal = 0; do_search: /* Search (up to entire) bitmap in this rgrp for allocatable block. "x <= length", instead of "x < length", because we typically start the search in the middle of a bit block, but if we can't find an allocatable block anywhere else, we want to be able wrap around and search in the first part of our first-searched bit block. */ for (x = 0; x <= length; x++) { bi = rgd->rd_bits + buf; if (test_bit(GBF_FULL, &bi->bi_flags) && (old_state == GFS2_BLKST_FREE)) goto skip; /* The GFS2_BLKST_UNLINKED state doesn't apply to the clone bitmaps, so we must search the originals for that. */ buffer = bi->bi_bh->b_data + bi->bi_offset; WARN_ON(!buffer_uptodate(bi->bi_bh)); if (old_state != GFS2_BLKST_UNLINKED && bi->bi_clone) buffer = bi->bi_clone + bi->bi_offset; blk = gfs2_bitfit(buffer, bi->bi_len, goal, old_state); if (blk != BFITNOENT) break; if ((goal == 0) && (old_state == GFS2_BLKST_FREE)) set_bit(GBF_FULL, &bi->bi_flags); /* Try next bitmap block (wrap back to rgrp header if at end) */ skip: buf++; buf %= length; goal = 0; } if (blk == BFITNOENT) return blk; *n = 1; if (old_state == new_state) goto out; gfs2_trans_add_bh(rgd->rd_gl, bi->bi_bh, 1); gfs2_setbit(rgd, bi->bi_bh->b_data, bi->bi_clone, bi->bi_offset, bi, blk, new_state); goal = blk; while (*n < elen) { goal++; if (goal >= (bi->bi_len * GFS2_NBBY)) break; if (gfs2_testbit(rgd, buffer, bi->bi_len, goal) != GFS2_BLKST_FREE) break; gfs2_setbit(rgd, bi->bi_bh->b_data, bi->bi_clone, bi->bi_offset, bi, goal, new_state); (*n)++; } out: return (bi->bi_start * GFS2_NBBY) + blk; } /** * rgblk_free - Change alloc state of given block(s) * @sdp: the filesystem * @bstart: the start of a run of blocks to free * @blen: the length of the block run (all must lie within ONE RG!) * @new_state: GFS2_BLKST_XXX the after-allocation block state * * Returns: Resource group containing the block(s) */ static struct gfs2_rgrpd *rgblk_free(struct gfs2_sbd *sdp, u64 bstart, u32 blen, unsigned char new_state) { struct gfs2_rgrpd *rgd; struct gfs2_bitmap *bi = NULL; u32 length, rgrp_blk, buf_blk; unsigned int buf; rgd = gfs2_blk2rgrpd(sdp, bstart); if (!rgd) { if (gfs2_consist(sdp)) fs_err(sdp, "block = %llu\n", (unsigned long long)bstart); return NULL; } length = rgd->rd_length; rgrp_blk = bstart - rgd->rd_data0; while (blen--) { for (buf = 0; buf < length; buf++) { bi = rgd->rd_bits + buf; if (rgrp_blk < (bi->bi_start + bi->bi_len) * GFS2_NBBY) break; } gfs2_assert(rgd->rd_sbd, buf < length); buf_blk = rgrp_blk - bi->bi_start * GFS2_NBBY; rgrp_blk++; if (!bi->bi_clone) { bi->bi_clone = kmalloc(bi->bi_bh->b_size, GFP_NOFS | __GFP_NOFAIL); memcpy(bi->bi_clone + bi->bi_offset, bi->bi_bh->b_data + bi->bi_offset, bi->bi_len); } gfs2_trans_add_bh(rgd->rd_gl, bi->bi_bh, 1); gfs2_setbit(rgd, bi->bi_bh->b_data, NULL, bi->bi_offset, bi, buf_blk, new_state); } return rgd; } /** * gfs2_rgrp_dump - print out an rgrp * @seq: The iterator * @gl: The glock in question * */ int gfs2_rgrp_dump(struct seq_file *seq, const struct gfs2_glock *gl) { const struct gfs2_rgrpd *rgd = gl->gl_object; if (rgd == NULL) return 0; gfs2_print_dbg(seq, " R: n:%llu f:%02x b:%u/%u i:%u\n", (unsigned long long)rgd->rd_addr, rgd->rd_flags, rgd->rd_free, rgd->rd_free_clone, rgd->rd_dinodes); return 0; } static void gfs2_rgrp_error(struct gfs2_rgrpd *rgd) { struct gfs2_sbd *sdp = rgd->rd_sbd; fs_warn(sdp, "rgrp %llu has an error, marking it readonly until umount\n", (unsigned long long)rgd->rd_addr); fs_warn(sdp, "umount on all nodes and run fsck.gfs2 to fix the error\n"); gfs2_rgrp_dump(NULL, rgd->rd_gl); rgd->rd_flags |= GFS2_RDF_ERROR; } /** * gfs2_alloc_block - Allocate one or more blocks * @ip: the inode to allocate the block for * @bn: Used to return the starting block number * @n: requested number of blocks/extent length (value/result) * * Returns: 0 or error */ int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n) { struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); struct buffer_head *dibh; struct gfs2_alloc *al = ip->i_alloc; struct gfs2_rgrpd *rgd; u32 goal, blk; u64 block; int error; /* Only happens if there is a bug in gfs2, return something distinctive * to ensure that it is noticed. */ if (al == NULL) return -ECANCELED; rgd = ip->i_rgd; if (rgrp_contains_block(rgd, ip->i_goal)) goal = ip->i_goal - rgd->rd_data0; else goal = rgd->rd_last_alloc; blk = rgblk_search(rgd, goal, GFS2_BLKST_FREE, GFS2_BLKST_USED, n); /* Since all blocks are reserved in advance, this shouldn't happen */ if (blk == BFITNOENT) goto rgrp_error; rgd->rd_last_alloc = blk; block = rgd->rd_data0 + blk; ip->i_goal = block + *n - 1; error = gfs2_meta_inode_buffer(ip, &dibh); if (error == 0) { struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; gfs2_trans_add_bh(ip->i_gl, dibh, 1); di->di_goal_meta = di->di_goal_data = cpu_to_be64(ip->i_goal); brelse(dibh); } if (rgd->rd_free < *n) goto rgrp_error; rgd->rd_free -= *n; gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1); gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data); al->al_alloced += *n; gfs2_statfs_change(sdp, 0, -(s64)*n, 0); gfs2_quota_change(ip, *n, ip->i_inode.i_uid, ip->i_inode.i_gid); rgd->rd_free_clone -= *n; trace_gfs2_block_alloc(ip, block, *n, GFS2_BLKST_USED);