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* afr: replace afr_frame_return() when possible with direct callYaniv Kaul2019-10-071-1/+1
| | | | | | | | | | | | If you are already under lock, just decrement the call count directly instead of removing the lock, re-taking the lock and decrementing. Implements https://github.com/gluster/glusterfs/issues/728 updates: bz#1193929 Signed-off-by: Yaniv Kaul <ykaul@redhat.com> Change-Id: I3fa20b4651fbdb826655c5a03baeed46e99b5487
* multiple files: another attempt to remove includesYaniv Kaul2019-06-141-4/+0
| | | | | | | | | | | | | | | | | | There are many include statements that are not needed. A previous more ambitious attempt failed because of *BSD plafrom (see https://review.gluster.org/#/c/glusterfs/+/21929/ ) Now trying a more conservative reduction. It does not solve all circular deps that we have, but it does reduce some of them. There is just too much to handle reasonably (dht-common.h includes dht-lock.h which includes dht-common.h ...), but it does reduce the overall number of lines of include we need to look at in the future to understand and fix the mess later one. Change-Id: I550cd001bdefb8be0fe67632f783c0ef6bee3f9f updates: bz#1193929 Signed-off-by: Yaniv Kaul <ykaul@redhat.com>
* cluster/thin-arbiter: Consider thin-arbiter before marking new entry changelogAshish Pandey2019-02-011-0/+6
| | | | | | | | | | | | | | | | If a fop to create an entry fails on one of the data brick, we mark the pending changelog on the entry on brick for which it was successful. This is done as part of post op phase to make sure that entry gets healed even if it gets renamed to some other path where its parent was not marked as bad. As it happens as part of post op, we should consider thin-arbiter to check if the brick, which was successful, is the good brick or not. This will avoide split brain and other issues. Change-Id: I12686675be98f02f70a5186b3ed748c541514d53 updates: bz#1662264 Signed-off-by: Ashish Pandey <aspandey@redhat.com>
* cluster/afr: Refactor internal locking code to allow multiple inodelksPranith Kumar K2018-12-281-143/+0
| | | | | | | | | | | | | | | | For implementing copy_file_range fop, AFR needs to perform two inodelks in the same transaction. This patch brings in the necessary structure to make it easier to do so. Entry-locks in AFR were already taking multiple entry-locks on different inodes with the respective basenames. This patch extends the logic in inodelks to use the same lockee_t structure. This lead to removal of quite a lot of duplicate code present in afr-lk-common.c as both the locks are doing same things except 'winding' part. updates: #536 Change-Id: Ibfce7e3f260bb27b18645152ec680c33866fe0ae Signed-off-by: Pranith Kumar K <pkarampu@redhat.com>
* AFR xlator: use dict_{setn|getn|deln|get_int32n|set_int32n|set_strn}Yaniv Kaul2018-12-171-1/+1
| | | | | | | | | | | | | | | | | | | | In a previous patch (https://review.gluster.org/20769) we've added the key length to be passed to dict_* funcs, to remove the need to strlen() it. This patch moves some xlators to use it. - In some cases, moved strlen() of the key length outside of locks, which is usually a good thing. Please verify it's safe to do so. - In some cases, created a prefix for the keys, replacing something like "%d-%d" with a "%s" in snprintf(). Not sure it adds value, but improves readability. Please review carefully. Compile-tested only! Change-Id: I04f2a1eb2ecfc3283d849d150d10d088ae7aa7f1 updates: bz#1193929 Signed-off-by: Yaniv Kaul <ykaul@redhat.com>
* cluster/afr: Do not update read_subvol in inode_ctx after rename/link fopkarthik-us2018-12-121-1/+3
| | | | | | | | | | | Since rename/link fops on a file will not change any data in it, it should not update the read_subvol values in the inode_ctx, which interprets the data & metadata readable subvols for that file. The old read_subvol values should be retained even after the rename/link operations. Change-Id: I068044a426823a566f5bea8aa063cd689199d6dd fixes: bz#1657783 Signed-off-by: karthik-us <ksubrahm@redhat.com>
* libglusterfs: Move devel headers under glusterfs directoryShyamsundarR2018-12-051-12/+12
| | | | | | | | | | | | | | | | | | | | | | | | libglusterfs devel package headers are referenced in code using include semantics for a program, this while it works can be better especially when dealing with out of tree xlator builds or in general out of tree devel package usage. Towards this, the following changes are done, - moved all devel headers under a glusterfs directory - Included these headers using system header notation <> in all code outside of libglusterfs - Included these headers using own program notation "" within libglusterfs This change although big, is just moving around the headers and making it correct when including these headers from other sources. This helps us correctly include libglusterfs includes without namespace conflicts. Change-Id: Id2a98854e671a7ee5d73be44da5ba1a74252423b Updates: bz#1193929 Signed-off-by: ShyamsundarR <srangana@redhat.com>
* Land part 2 of clang-format changesGluster Ant2018-09-121-1174/+1096
| | | | | Change-Id: Ia84cc24c8924e6d22d02ac15f611c10e26db99b4 Signed-off-by: Nigel Babu <nigelb@redhat.com>
* cluster/afr: Remove unused code pathsPranith Kumar K2018-03-061-17/+1
| | | | | | | | | | | | | | | | Removed 1) afr-v1 self-heal locks related code which is not used anymore 2) transaction has some data types that are not needed, so removed them 3) Never used lock tracing available in afr as gluster's network tracing does the job. So removed that as well. 4) Changelog is always enabled and afr is always used with locks, so __changelog_enabled, afr_lock_server_count etc functions can be deleted. 5) transaction.fop/done/resume always call the same functions, so no need to have these variables. BUG: 1549606 Change-Id: I370c146fec2892d40e674d232a5d7256e003c7f1 Signed-off-by: Pranith Kumar K <pkarampu@redhat.com>
* cluster/afr: Fixing the flaws in arbiter becoming source patchkarthik-us2018-01-131-8/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Problem: Setting the write_subvol value to read_subvol in case of metadata transaction during pre-op (commit 19f9bcff4aada589d4321356c2670ed283f02c03) might lead to the original problem of arbiter becoming source. Scenario: 1) All bricks are up and good 2) 2 writes w1 and w2 are in progress in parallel 3) ctx->read_subvol is good for all the subvolumes 4) w1 succeeds on brick0 and fails on brick1, yet to do post-op on the disk 5) read/lookup comes on the same file and refreshes read_subvols back to all good 6) metadata transaction happens which makes ctx->write_subvol to be assigned with ctx->read_subvol which is all good 7) w2 succeeds on brick1 and fails on brick0 and this will update the brick in reverse order leading to arbiter becoming source Fix: Instead of setting the ctx->write_subvol to ctx->read_subvol in the pre-op statge, if there is a metadata transaction, check in the function __afr_set_in_flight_sb_status() if it is a data/metadata transaction. Use the value of ctx->write_subvol if it is a data transactions and ctx->read_subvol value for other transactions. With this patch we assign the value of ctx->write_subvol in the afr_transaction_perform_fop() with the on disk value, instead of assigning it in the afr_changelog_pre_op() with the in memory value. Change-Id: Id2025a7e965f0578af35b1abaac793b019c43cc4 BUG: 1482064 Signed-off-by: karthik-us <ksubrahm@redhat.com>
* Coverity Issue: PW.INCLUDE_RECURSION in several filesGirjesh Rajoria2017-11-091-1/+0
| | | | | | | | | | | | | | Coverity ID: 407, 408, 409, 410, 411, 412, 413, 414, 415, 416, 417, 418, 419, 423, 424, 425, 426, 427, 428, 429, 436, 437, 438, 439, 440, 441, 442, 443 Issue: Event include_recursion Removed redundant, recursive includes from the files. Change-Id: I920776b1fa089a2d4917ca722d0075a9239911a7 BUG: 789278 Signed-off-by: Girjesh Rajoria <grajoria@redhat.com>
* afr: propagate correct errno for fop failures in arbiterRavishankar N2017-05-151-1/+0
| | | | | | | | | | | | | | | | | | | | | | | Problem: If quorum is not met in fop cbk, arbiter sends an ENOTCONN error to the upper xlators. In a VM workload with sharding enabled, this was leading to the VM pausing when replace-brick was performed as described in the BZ. Fix: Move the fop cbk arbitration logic to afr_handle_quorum() because in normal replica volumes, that is the function that has the quorum and errno checks in the fop cbk path before doing a post-op. Thanks to Pranith for suggesting this approach. Change-Id: Ie6315db30c5e36326b71b90a01da824109e86796 BUG: 1449610 Signed-off-by: Ravishankar N <ravishankar@redhat.com> Reviewed-on: https://review.gluster.org/17235 Smoke: Gluster Build System <jenkins@build.gluster.org> Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org> CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
* afr: Avoid resetting event_gen when brick is always downRavishankar N2017-01-121-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | Problem: __afr_set_in_flight_sb_status(), which resets event_gen to zero, is called if failed_subvols[i] is non-zero for any brick. But failed_subvols[i] is true even if the brick was down *before* the transaction started. Hence say if 1 brick is down in a replica-3, every writev that comes will trigger an inode refresh because of this resetting, as seen from the no. of FSTATs in the profile info in the BZ. Fix: Reset event gen only if the brick was previously a valid read child and the FOP failed on it the first time. Also `s/afr_inode_read_subvol_reset/afr_inode_event_gen_reset` because the function only resets event gen and not the data/metadata readable. Change-Id: I603ae646cbde96995c35db77916e2ed80b602a91 BUG: 1409206 Signed-off-by: Ravishankar N <ravishankar@redhat.com> Reviewed-on: http://review.gluster.org/16309 Smoke: Gluster Build System <jenkins@build.gluster.org> Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com> Tested-by: Pranith Kumar Karampuri <pkarampu@redhat.com> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org> CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
* cluster/afr: Prevent split-brain when bricks are brought off and on in ↵Krutika Dhananjay2016-08-221-2/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | cyclic order When the bricks are brought offline and then online in cyclic order while writes are in progress on a file, thanks to inode refresh in write txns, AFR will mostly fail the write attempt when the only good copy is offline. However, there is still a remote possibility that the file will run into split-brain if the brick that has the lone good copy goes offline *after* the inode refresh but *before* the write txn completes (I call it in-flight split-brain in the patch for ease of reference), requiring intervention from admin to resolve the split-brain before the IO can resume normally on the file. To get around this, the patch does the following things: i) retains the dirty xattrs on the file ii) avoids marking the last of the good copies as bad (or accused) in case it is the one to go down during the course of a write. iii) fails that particular write with the appropriate errno. This way, we still have one good copy left despite the split-brain situation which when it is back online, will be chosen as source to do the heal. Change-Id: I9ca634b026ac830b172bac076437cc3bf1ae7d8a BUG: 1363721 Signed-off-by: Krutika Dhananjay <kdhananj@redhat.com> Reviewed-on: http://review.gluster.org/15080 Tested-by: Pranith Kumar Karampuri <pkarampu@redhat.com> Smoke: Gluster Build System <jenkins@build.gluster.org> CentOS-regression: Gluster Build System <jenkins@build.gluster.org> Reviewed-by: Ravishankar N <ravishankar@redhat.com> Reviewed-by: Oleksandr Natalenko <oleksandr@natalenko.name> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org> Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
* cluster/afr: Unwind xdata_rsp even in case of failuresPranith Kumar K2016-05-301-6/+14
| | | | | | | | | | | | | | | | | | | DHT expects GF_PREOP_CHECK_FAILED to be present in xdata_rsp in case of mkdir failures because of stale layout. But AFR was unwinding null xdata_rsp in case of failures. This was leading to mkdir failures just after remove-brick. Unwind the xdata_rsp in case of failures to make sure the response from brick reaches dht. BUG: 1340623 Change-Id: Idd3f7b95730e8ea987b608e892011ff190e181d1 Signed-off-by: Pranith Kumar K <pkarampu@redhat.com> Reviewed-on: http://review.gluster.org/14553 NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org> Reviewed-by: Ravishankar N <ravishankar@redhat.com> Smoke: Gluster Build System <jenkins@build.gluster.com> CentOS-regression: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Anuradha Talur <atalur@redhat.com> Reviewed-by: Krutika Dhananjay <kdhananj@redhat.com>
* cluster/afr: Don't let NFS cache stat after writesPranith Kumar K2016-05-041-2/+9
| | | | | | | | | | | | | | | | | | | | | | | | | Problem: Afr does post-ops after write but the stat buffer it unwinds is at the time of write, so if nfs client caches this, it will see different ctime when it does stat on it after post-op is done. From NFS client's perspective it thinks the file is changed. Tar which depends on this to be correct keeps giving 'file changed as we read it' warning. If Afr instead has to choose to unwind after post-op, eager-lock, delayed-post-op will have to be disabled which will lead to bad performance for all write usecases. Fix: Don't let client cache stat after write. Change-Id: Ic6062acc6e5cdd97a9c83c56bd529ec83cee8a23 BUG: 1302948 Signed-off-by: Pranith Kumar K <pkarampu@redhat.com> Signed-off-by: Anuradha Talur <atalur@redhat.com> Reviewed-on: http://review.gluster.org/13785 Smoke: Gluster Build System <jenkins@build.gluster.com> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org> CentOS-regression: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Niels de Vos <ndevos@redhat.com>
* afr/index: changes for granular entry self-healRavishankar N2016-04-301-1/+2
| | | | | | | | | | | | | | | | Implements new indices type ENTRY_CHANGES where other xlators can add/delete names. Change-Id: I01c5568997085e11d22ba36a4376c70b78fb3827 BUG: 1269461 Signed-off-by: Ravishankar N <ravishankar@redhat.com> Reviewed-on: http://review.gluster.org/12482 Tested-by: Krutika Dhananjay <kdhananj@redhat.com> Tested-by: Pranith Kumar Karampuri <pkarampu@redhat.com> Smoke: Gluster Build System <jenkins@build.gluster.com> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org> CentOS-regression: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
* dht/afr/client/posix: Fail mkdir without gfid-reqPranith Kumar K2016-04-291-6/+12
| | | | | | | | | | | | | | | Do not allow directory creations without gfids as after the directories are created, operations on them fail anyway. So it is better to fail mkdir. BUG: 1317361 Change-Id: I8f8e3b38bbded1960b7215bac0432500f7e78038 Signed-off-by: Pranith Kumar K <pkarampu@redhat.com> Reviewed-on: http://review.gluster.org/13690 Smoke: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Krutika Dhananjay <kdhananj@redhat.com> CentOS-regression: Gluster Build System <jenkins@build.gluster.com> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
* cluster/afr: Fix read-child selection in entry create fopPranith Kumar K2016-03-281-1/+13
| | | | | | | | | | | | | | | | | | When an entry is being created the inode is yet to be linked so args must be filled with gfid and ia_type for it to give consistent iatt. Also handle Dht sending fops on inode not yet linked. BUG: 1302948 Change-Id: I6969cacb437cad02f66716f3bf8ec004ffe7c691 Signed-off-by: Pranith Kumar K <pkarampu@redhat.com> Reviewed-on: http://review.gluster.org/13827 Reviewed-by: Krutika Dhananjay <kdhananj@redhat.com> Smoke: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Anuradha Talur <atalur@redhat.com> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org> CentOS-regression: Gluster Build System <jenkins@build.gluster.com>
* afr: Add throttled background client-side healsRavishankar N2016-03-011-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | If a heal is needed after inode refresh (lookup, read_txn), launch it in the background instead of blocking the fop (that triggered refresh) until the heal happens. afr_replies_interpret() is modified such that the heal is launched only if atleast one sink brick is up. Max. no of heals that can happen in parallel is configurable via the 'background-self-heal-count' volume option. Any number greater than that is put in a wait queue whose length is configurable via 'heal-wait-queue-leng' volume option. If the wait queue is also full, further heals will be ignored. Default values: background-self-heal-count=8, heal-wait-queue-leng=128 Change-Id: I1d4a52814cdfd43d90591b6d2ad7b6219937ce70 BUG: 1297172 Signed-off-by: Ravishankar N <ravishankar@redhat.com> Reviewed-on: http://review.gluster.org/13207 Smoke: Gluster Build System <jenkins@build.gluster.com> CentOS-regression: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com> Tested-by: Pranith Kumar Karampuri <pkarampu@redhat.com> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
* cluster/afr: Remember flags sent by create fopPranith Kumar K2015-11-261-0/+1
| | | | | | | | | | | | | | | | | | | | | | Problem: In create fop, afr doesn't remember the flags. When afr has to perform fixing of the fd that needs to be opened on other bricks because the brick was down at the time of create, the flags with which it needs to send open are not present. Fix: Remember the flags in the fd_ctx. Thanks to Nitya for showing us the problem in re-open with the flags. Change-Id: I8ce1eb50c35fc0722cfc25cb4b6d234ef56180e5 BUG: 1285173 Signed-off-by: Pranith Kumar K <pkarampu@redhat.com> Reviewed-on: http://review.gluster.org/12739 Reviewed-by: Krutika Dhananjay <kdhananj@redhat.com> Reviewed-by: Ravishankar N <ravishankar@redhat.com> Tested-by: NetBSD Build System <jenkins@build.gluster.org> Tested-by: Gluster Build System <jenkins@build.gluster.com>
* cluster/afr: Pick gfid from poststat during fresh lookup for read child ↵Krutika Dhananjay2015-06-241-3/+3
| | | | | | | | | | | calculation Change-Id: I12c1e4f67f4ec4affbe13d7daf871044a8a2a12e BUG: 1235216 Signed-off-by: Krutika Dhananjay <kdhananj@redhat.com> Reviewed-on: http://review.gluster.org/11373 Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com> Tested-by: NetBSD Build System <jenkins@build.gluster.org>
* build: do not #include "config.h" in each fileNiels de Vos2015-05-291-5/+0
| | | | | | | | | | | | | | | | | | Instead of including config.h in each file, and have the additional config.h included from the compiler commandline (-include option). When a .c file tests for a certain #define, and config.h was not included, incorrect assumtions were made. With this change, it can not happen again. BUG: 1222319 Change-Id: I4f9097b8740b81ecfe8b218d52ca50361f74cb64 Signed-off-by: Niels de Vos <ndevos@redhat.com> Reviewed-on: http://review.gluster.org/10808 Tested-by: Gluster Build System <jenkins@build.gluster.com> Tested-by: NetBSD Build System Reviewed-by: Kaleb KEITHLEY <kkeithle@redhat.com> Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
* afr: add arbitration supportRavishankar N2015-05-051-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | Add logic in afr to work in conjunction with the arbiter xlator when a replica 3 arbiter volume is created. More specifically, this patch: * Enables full locks for afr data transaction for such volumes. * Removes the upfront marking of pending xattrs at the time of pre-op and defer it to post-op. (This is an arbiter independent change and is made for all afr transactions.) * After pre-op stage, check if we can proceed with the fop stage without ending up in split-brain by examining the changelog xattrs. * Unwinds the fop with failure if only one source was available at the time of pre-op and the fop happened to fail on particular source brick. * Skips data self-heal if arbiter brick is the only source available. * Adds the arbiter-count option to the shd graph. This patch is a part of the arbiter logic implementation for 3 way AFR details of which can be found at http://review.gluster.org/#/c/9656/ Change-Id: I9603db9d04de5626eb2f4d8d959ef5b46113561d BUG: 1199985 Signed-off-by: Ravishankar N <ravishankar@redhat.com> Reviewed-on: http://review.gluster.org/10258 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
* Avoid conflict between contrib/uuid and system uuidEmmanuel Dreyfus2015-04-041-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | glusterfs relies on Linux uuid implementation, which API is incompatible with most other systems's uuid. As a result, libglusterfs has to embed contrib/uuid, which is the Linux implementation, on non Linux systems. This implementation is incompatible with systtem's built in, but the symbols have the same names. Usually this is not a problem because when we link with -lglusterfs, libc's symbols are trumped. However there is a problem when a program not linked with -lglusterfs will dlopen() glusterfs component. In such a case, libc's uuid implementation is already loaded in the calling program, and it will be used instead of libglusterfs's implementation, causing crashes. A possible workaround is to use pre-load libglusterfs in the calling program (using LD_PRELOAD on NetBSD for instance), but such a mechanism is not portable, nor is it flexible. A much better approach is to rename libglusterfs's uuid_* functions to gf_uuid_* to avoid any possible conflict. This is what this change attempts. BUG: 1206587 Change-Id: I9ccd3e13afed1c7fc18508e92c7beb0f5d49f31a Signed-off-by: Emmanuel Dreyfus <manu@netbsd.org> Reviewed-on: http://review.gluster.org/10017 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Niels de Vos <ndevos@redhat.com>
* afr: coverity fixesRavishankar N2014-12-231-4/+3
| | | | | | | | | | | | | Some fixes for the 17th Dec 2014 run. https://scan6.coverity.com:8443/reports.htm#v31028/p10714/g31029 Change-Id: Ia4410ef87a56fffb61803d0a4e62369b058e1cfb BUG: 1176089 Signed-off-by: Ravishankar N <ravishankar@redhat.com> Reviewed-on: http://review.gluster.org/9314 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com> Tested-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
* cluster/afr : Mark pending changelog xattrs for new creationsAnuradha2014-09-031-21/+9
| | | | | | | | | | | | | Based on type of file, set appropriate pending changelogs for new entries. Change-Id: Ifd124bf9bc54b996ce83ab9f39d03b3ccca7eb3c BUG: 1130892 Signed-off-by: Anuradha <atalur@redhat.com> Reviewed-on: http://review.gluster.org/8555 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com> Tested-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
* cluster/afr: Set pending changelog based on filetype for new entriesPranith Kumar K2014-08-211-4/+12
| | | | | | | | | Change-Id: Ib6eea2dfe43aacf1f3446cc023adecbcf8645d48 BUG: 1132102 Signed-off-by: Pranith Kumar K <pkarampu@redhat.com> Reviewed-on: http://review.gluster.org/8506 Reviewed-by: Anuradha Talur <atalur@redhat.com> Tested-by: Gluster Build System <jenkins@build.gluster.com>
* cluster/afr: Fix bugs in quorum implementationPranith Kumar K2014-05-141-16/+0
| | | | | | | | | | | | | - Have common place to perform quorum fop wind check - Check if fop succeeded in a way that matches quorum to avoid marking changelog in split-brain. BUG: 1066996 Change-Id: Ibc5b80e01dc206b2abbea2d29e26f3c60ff4f204 Signed-off-by: Pranith Kumar K <pkarampu@redhat.com> Reviewed-on: http://review.gluster.org/7600 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Ravishankar N <ravishankar@redhat.com>
* cluster/afr: refactorAnand Avati2014-03-221-1066/+583
| | | | | | | | | | | | | | | | | | | | | | | | | | | | - Remove client side self-healing completely (opendir, openfd, lookup) - Re-work readdir-failover to work reliably in case of NFS - Remove unused/dead lock recovery code - Consistently use xdata in both calls and callbacks in all FOPs - Per-inode event generation, used to force inode ctx refresh - Implement dirty flag support (in place of pending counts) - Eliminate inode ctx structure, use read subvol bits + event_generation - Implement inode ctx refreshing based on event generation - Provide backward compatibility in transactions - remove unused variables and functions - make code more consistent in style and pattern - regularize and clean up inode-write transaction code - regularize and clean up dir-write transaction code - regularize and clean up common FOPs - reorganize transaction framework code - skip setting xattrs in pending dict if nothing is pending - re-write self-healing code using syncops - re-write simpler self-heal-daemon Change-Id: I1e4080c9796c8a2815c2dab4be3073f389d614a8 BUG: 1021686 Signed-off-by: Anand Avati <avati@redhat.com> Reviewed-on: http://review.gluster.org/6010 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Vijay Bellur <vbellur@redhat.com>
* cluster/afr: Add special handling for failure postopsPranith Kumar K2013-08-281-21/+0
| | | | | | | | | | | | | | | | Idea is to not leave the file in FOOL-FOOL scenario in case on all the bricks data transaction failed with EDQUOT to avoid increasing un-necessary load of self-heals in the system. For directory transactions don't leave pending changelog in case the failures are seen on all the subvolumes. Change-Id: I38a5561d1d581a78347a76a4a509514e4a0c3fb7 BUG: 969461 Signed-off-by: Pranith Kumar K <pkarampu@redhat.com> Reviewed-on: http://review.gluster.org/5709 Reviewed-by: Anand Avati <avati@redhat.com> Tested-by: Gluster Build System <jenkins@build.gluster.com>
* cluster/afr: Treat all dir fop failure as success in changelogPranith Kumar K2013-04-031-1/+31
| | | | | | | | | | | | | | | For example: If a new entry creation fop fails with EEXIST or a delete entry fop fails with ENOENT, on all the subvols the fop is wound, then no change took place to the directory. So we can treat that case as no change happened to the directory. Change-Id: I3b3a7931954da2166a9cba19ff9f76f37739d751 BUG: 860210 Signed-off-by: Pranith Kumar K <pkarampu@redhat.com> Reviewed-on: http://review.gluster.org/4626 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Anand Avati <avati@redhat.com>
* afr: Modified book-keeping structures for entrylksKrishnan Parthasarathi2013-01-231-43/+166
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * There are upto 3 entry lockees that may be needed to perform entrylk'ing in posix dir-write operations. * For eg, rmdir ("/a/b") needs to acquire locks on two entities, - entrylk ("/a", "b") - entrylk ("/a/b", null) * Changed existing entrylk/rename/selfheal (entrylk) transactions to use the new book-keeping structures * Fixed few issues in afr_trace_entry_lk{in,out} functions. Tracing is now aware of the new entry lockee structure. Implementation notes: * Changed 'cookie' sent in stack_wind to encode lockee_entity_no and subvol_no. cookie is a non-negative integer such that 0 <= cookie < replica_count, When more than one lock is being acquired across the subvolumes, cookie % replica_count gives the subvol_no cookie / replica_count gives the lockee_entity_no. Change-Id: Idbf41803387a7d59a0f7fcb1453d91cea74da153 BUG: 765564 Signed-off-by: Krishnan Parthasarathi <kp@gluster.com> Reviewed-on: http://review.gluster.org/2828 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Anand Avati <avati@redhat.com>
* cluster/afr: mark new entry changelog for create/mknod failuresPranith Kumar K2012-12-041-1/+126
| | | | | | | | | | | | | | | | | | | | | | Problem: When create/mknod fails on some of the nodes, appropriate pending data/metadata changelogs are not assigned. This was not considered to be an issue because entry self-heal would do the assigning of appropriate changelog after creating new entries. But using the combination of rebalance and remove brick we can construct a case where a file with same name and gfid can be created in a dir with different data and link-to xattr without any changelog. Fix: When a create/mknod failure is observed mark the appropriate changelog on the new file created. Change-Id: I4c32cbf5594a13fb14deaf97ff30b2fff11cbfd6 BUG: 858212 Signed-off-by: Pranith Kumar K <pkarampu@redhat.com> Reviewed-on: http://review.gluster.org/4207 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Anand Avati <avati@redhat.com>
* Preventing client crashing as the callings of GF_CALLOC has been failed.linbaiye2012-10-111-8/+40
| | | | | | | | | | | | | As the callings of GF_CALLOC can seldom come to a failure, glusterfs client will crash due to segment fault. We should have returned once the variables of transaction's local can't be alloced. Change-Id: Ia3798b8349d832b23c7825e64dbad93ebe29cd1b BUG: 861335 Signed-off-by: linbaiye <linbaiye@gmail.com> Reviewed-on: http://review.gluster.org/4005 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Anand Avati <avati@redhat.com>
* cluster/afr: Unwind with correct pre/post parent bufsPranith Kumar K2012-08-021-346/+135
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | RCA: In case of dir fops create, mknod, mkdir, link, symlink, rename if the fop fails on read-child then unwinds are happening with all-zero pre/post iatt-bufs. The bug occurs because the parent bufs are not saved if the response is not from read-child. Fix: Save the pre/post-bufs for the first response. If the response comes from read-child, overwrite whatever we have cached. Tests: Attached the mount process to gdb. Tested that the unwinds happen with proper pre/post iatt bufs in the following cases: 1) All success case 2) Failure on read-child 3) Failure on non-read-child 4) Failure on all children. Tested soft-link self-heal to test the change made in that. Tested errno ENOTEMPTY for rmdir, rename fops. Change-Id: I82882423d2d766b4f4a3044203bcb5dbcaee1755 BUG: 845242 Signed-off-by: Pranith Kumar K <pranithk@gluster.com> Reviewed-on: http://review.gluster.com/3775 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Anand Avati <avati@redhat.com>
* cluster/afr: Handle failures in fop_cbk gracefullyPranith Kumar K2012-07-311-31/+46
| | | | | | | | | | | | | | | | | | | | | | | | | RCA: Afr crashes when a last fop response fails and 'fop output' arguments are NULL. Afr does not handle these gracefully. Fix: Changed the fops to not access the 'fop output' arguments in case of failures. Tests: Changed afr wind_cbk code to fail the last response by setting op_ret as -1 and op_errno as ENOMEM and setting all other output variables as NULL to test the change. Removed the code to verify success cases. No crashes or errors seen. Change-Id: Iad9bc54db093a162f85bfb8dbeeda5b95acd21d8 BUG: 844689 Signed-off-by: Pranith Kumar K <pranithk@gluster.com> Reviewed-on: http://review.gluster.com/3760 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Amar Tumballi <amarts@redhat.com> Reviewed-by: Anand Avati <avati@redhat.com>
* cluster: fix crash on link of named pipe in stripe/replicate volBrian Foster2012-07-251-2/+1
| | | | | | | | | | | | | | | | | | | | | | | | A crash occurs when attempting to link a named pipe on a striped, replicated volume. The cause for this crash is attempting to deref a NULL inode pointer in stripe_link_cbk(). The RCA for this bug uncovered a couple of problems: - AFR ignores the inode pointer it receives on failure (returning NULL). - stripe assumes the inode pointer is valid on failure. Either one of these changes addresses the crash, but this patch includes both changes. AFR is modified to pass along the inode pointer it receives (which could still be NULL). stripe is modified to not assume the inode pointer is valid on fop failure. BUG: 842825 Change-Id: I9cb2cc918552620929c3ecbd69bc66d4635eafdc Signed-off-by: Brian Foster <bfoster@redhat.com> Reviewed-on: http://review.gluster.com/3727 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Jeff Darcy <jdarcy@redhat.com> Reviewed-by: Anand Avati <avati@redhat.com>
* afr: pass back xdata in createBrian Foster2012-07-231-2/+5
| | | | | | | | | | | | | | | A striped, replicated volume spits an error on file creation because stripe requires xdata to process stripe information and AFR isn't passing it back. This fix was suggested by Amar Tumballi. BUG: 842373 Change-Id: Ia7063590ca5e873d4a4e155989cf067e8a07501f Signed-off-by: Brian Foster <bfoster@redhat.com> Reviewed-on: http://review.gluster.com/3713 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Anand Avati <avati@redhat.com>
* remove useless if-before-free (and free-like) functionsJim Meyering2012-07-131-2/+1
| | | | | | | | | | | | See comments in http://bugzilla.redhat.com/839925 for the code to perform this change. Signed-off-by: Jim Meyering <meyering@redhat.com> BUG: 839925 Change-Id: I10e4ecff16c3749fe17c2831c516737e08a3205a Reviewed-on: http://review.gluster.com/3661 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Anand Avati <avati@redhat.com>
* replicate: add hashed read-child method.Jeff Darcy2012-05-311-5/+10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Both the first-to-respond method and the round-robin method are susceptible to clients repeatedly choosing the same servers across a series of opens, creating hot spots. Also, the code to handle a replica being down will ignore both methods and just choose the first remaining (which is not an issue for two-way but can be otherwise). The hashed method more reliably avoids such hot spots. There are three values/modes. 0: use the old (broken) methods. 1: select a read-child based on a hash of the file's GFID, so all clients will choose the same subvolume for a file (ensuring maximum consistency) but will distribute load for a set of files. 2: select a read-child based on a hash of the file's GFID plus the client's PID, so different children will distribute load even for one file. Mode 2 will probably be optimal for most cases. Using response time when we open the file is problematic, both because a single sample might not have been representative even then and because load might have shifted in the hours or days since (for long-lived files). Trying to use more current load information can lead to "herd following" behavior which is just as bad. Pseudo-random distribution is likely to be the best we can reasonably do, just as it is for DHT. Change-Id: I798c2760411eacf32e82a85f03bb7b08a4a49461 BUG: 802513 Signed-off-by: Jeff Darcy <jdarcy@redhat.com> Reviewed-on: http://review.gluster.com/2926 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Anand Avati <avati@redhat.com>
* Thou shalt not free(3) memory dirname(3) returnedEmmanuel Dreyfus2012-05-211-1/+9
| | | | | | | | | | | | | | On Linux basename() and dirname() return a pointer within the string passed as argument. On BSD flavors, basename() and dirname() return static storage, or pthread specific storage. Both behaviour are compliant, but calling free on the result in the second case is a bug. BUG: 764655 Change-Id: Ic82414aff1f8db2a7544b16315761ce1c05276c4 Signed-off-by: Emmanuel Dreyfus <manu@netbsd.org> Reviewed-on: http://review.gluster.com/3377 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Pranith Kumar Karampuri <pranithk@gluster.com>
* license: dual license under GPLV2 and LGPLV3+Kaleb KEITHLEY2012-05-101-14/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Note that the license was not changed in any of the following: .../argp-standalone/... .../booster/... .../cli/... .../contrib/... .../extras/... .../glusterfsd/... .../glusterfs-hadoop/... .../mod_clusterfs/... .../scheduler/... .../swift/... The license was not changed in any of the non-building xlators. The license was not changed in any of the xlators that seemed — to me — to be clearly server-side only, e.g. protocol/server Note too that copyright was changed along with the license; I did not change the copyright in files where the license did not change. If you find any errors or ommissions please don't hesitate to let me know. The complete list of files with the license change is: libglusterfs/src/byte-order.h libglusterfs/src/call-stub.c libglusterfs/src/call-stub.h libglusterfs/src/checksum.c libglusterfs/src/checksum.h libglusterfs/src/circ-buff.c libglusterfs/src/circ-buff.h libglusterfs/src/common-utils.c libglusterfs/src/common-utils.h libglusterfs/src/compat-errno.c libglusterfs/src/compat-errno.h libglusterfs/src/compat.c libglusterfs/src/compat.h libglusterfs/src/daemon.c libglusterfs/src/daemon.h libglusterfs/src/defaults.c libglusterfs/src/defaults.h libglusterfs/src/dict.c libglusterfs/src/dict.h libglusterfs/src/event-history.c libglusterfs/src/event-history.h libglusterfs/src/event.c libglusterfs/src/event.h libglusterfs/src/fd-lk.c libglusterfs/src/fd-lk.h libglusterfs/src/fd.c libglusterfs/src/fd.h libglusterfs/src/gf-dirent.c libglusterfs/src/gf-dirent.h libglusterfs/src/globals.c libglusterfs/src/globals.h libglusterfs/src/glusterfs.h libglusterfs/src/graph-print.c libglusterfs/src/graph-utils.h libglusterfs/src/graph.c libglusterfs/src/hashfn.c libglusterfs/src/hashfn.h libglusterfs/src/iatt.h libglusterfs/src/inode.c libglusterfs/src/inode.h libglusterfs/src/iobuf.c libglusterfs/src/iobuf.h libglusterfs/src/latency.c libglusterfs/src/latency.h libglusterfs/src/list.h libglusterfs/src/lkowner.h libglusterfs/src/locking.h libglusterfs/src/logging.c libglusterfs/src/logging.h libglusterfs/src/mem-pool.c libglusterfs/src/mem-pool.h libglusterfs/src/mem-types.h libglusterfs/src/options.c libglusterfs/src/options.h libglusterfs/src/rbthash.c libglusterfs/src/rbthash.h libglusterfs/src/run.c libglusterfs/src/run.h libglusterfs/src/scheduler.c libglusterfs/src/scheduler.h libglusterfs/src/stack.c libglusterfs/src/stack.h libglusterfs/src/statedump.c libglusterfs/src/statedump.h libglusterfs/src/syncop.c libglusterfs/src/syncop.h libglusterfs/src/syscall.c libglusterfs/src/syscall.h libglusterfs/src/timer.c libglusterfs/src/timer.h libglusterfs/src/trie.c libglusterfs/src/trie.h libglusterfs/src/xlator.c libglusterfs/src/xlator.h libglusterfsclient/src/libglusterfsclient-dentry.c libglusterfsclient/src/libglusterfsclient-internals.h libglusterfsclient/src/libglusterfsclient.c libglusterfsclient/src/libglusterfsclient.h rpc/rpc-lib/src/auth-glusterfs.c rpc/rpc-lib/src/auth-null.c rpc/rpc-lib/src/auth-unix.c rpc/rpc-lib/src/protocol-common.h rpc/rpc-lib/src/rpc-clnt.c rpc/rpc-lib/src/rpc-clnt.h rpc/rpc-lib/src/rpc-transport.c rpc/rpc-lib/src/rpc-transport.h rpc/rpc-lib/src/rpcsvc-auth.c rpc/rpc-lib/src/rpcsvc-common.h rpc/rpc-lib/src/rpcsvc.c rpc/rpc-lib/src/rpcsvc.h rpc/rpc-lib/src/xdr-common.h rpc/rpc-lib/src/xdr-rpc.c rpc/rpc-lib/src/xdr-rpc.h rpc/rpc-lib/src/xdr-rpcclnt.c rpc/rpc-lib/src/xdr-rpcclnt.h rpc/rpc-transport/rdma/src/name.c rpc/rpc-transport/rdma/src/name.h rpc/rpc-transport/rdma/src/rdma.c rpc/rpc-transport/rdma/src/rdma.h rpc/rpc-transport/socket/src/name.c rpc/rpc-transport/socket/src/name.h rpc/rpc-transport/socket/src/socket.c rpc/rpc-transport/socket/src/socket.h xlators/cluster/afr/src/afr-common.c xlators/cluster/afr/src/afr-dir-read.c xlators/cluster/afr/src/afr-dir-read.h xlators/cluster/afr/src/afr-dir-write.c xlators/cluster/afr/src/afr-dir-write.h xlators/cluster/afr/src/afr-inode-read.c xlators/cluster/afr/src/afr-inode-read.h xlators/cluster/afr/src/afr-inode-write.c xlators/cluster/afr/src/afr-inode-write.h xlators/cluster/afr/src/afr-lk-common.c xlators/cluster/afr/src/afr-mem-types.h xlators/cluster/afr/src/afr-open.c xlators/cluster/afr/src/afr-self-heal-algorithm.c xlators/cluster/afr/src/afr-self-heal-algorithm.h xlators/cluster/afr/src/afr-self-heal-common.c xlators/cluster/afr/src/afr-self-heal-common.h xlators/cluster/afr/src/afr-self-heal-data.c xlators/cluster/afr/src/afr-self-heal-entry.c xlators/cluster/afr/src/afr-self-heal-metadata.c xlators/cluster/afr/src/afr-self-heal.h xlators/cluster/afr/src/afr-self-heald.c xlators/cluster/afr/src/afr-self-heald.h xlators/cluster/afr/src/afr-transaction.c xlators/cluster/afr/src/afr-transaction.h xlators/cluster/afr/src/afr.c xlators/cluster/afr/src/afr.h xlators/cluster/afr/src/pump.c xlators/cluster/afr/src/pump.h xlators/cluster/dht/src/dht-common.c xlators/cluster/dht/src/dht-common.h xlators/cluster/dht/src/dht-diskusage.c xlators/cluster/dht/src/dht-hashfn.c xlators/cluster/dht/src/dht-helper.c xlators/cluster/dht/src/dht-inode-read.c xlators/cluster/dht/src/dht-inode-write.c xlators/cluster/dht/src/dht-layout.c xlators/cluster/dht/src/dht-linkfile.c xlators/cluster/dht/src/dht-mem-types.h xlators/cluster/dht/src/dht-rebalance.c xlators/cluster/dht/src/dht-rename.c xlators/cluster/dht/src/dht-selfheal.c xlators/cluster/dht/src/dht.c xlators/cluster/dht/src/nufa.c xlators/cluster/dht/src/switch.c xlators/cluster/stripe/src/stripe-helpers.c xlators/cluster/stripe/src/stripe-mem-types.h xlators/cluster/stripe/src/stripe.c xlators/cluster/stripe/src/stripe.h xlators/features/index/src/index-mem-types.h ¹ xlators/features/index/src/index.c ¹ xlators/features/index/src/index.h ¹ xlators/performance/io-cache/src/io-cache.c xlators/performance/io-cache/src/io-cache.h xlators/performance/io-cache/src/ioc-inode.c xlators/performance/io-cache/src/ioc-mem-types.h xlators/performance/io-cache/src/page.c xlators/performance/io-threads/src/io-threads.c xlators/performance/io-threads/src/io-threads.h xlators/performance/io-threads/src/iot-mem-types.h xlators/performance/md-cache/src/md-cache-mem-types.h xlators/performance/md-cache/src/md-cache.c xlators/performance/quick-read/src/quick-read-mem-types.h xlators/performance/quick-read/src/quick-read.c xlators/performance/quick-read/src/quick-read.h xlators/performance/read-ahead/src/page.c xlators/performance/read-ahead/src/read-ahead-mem-types.h xlators/performance/read-ahead/src/read-ahead.c xlators/performance/read-ahead/src/read-ahead.h xlators/performance/symlink-cache/src/symlink-cache.c xlators/performance/write-behind/src/write-behind-mem-types.h xlators/performance/write-behind/src/write-behind.c xlators/protocol/auth/addr/src/addr.c ¹ xlators/protocol/auth/login/src/login.c ¹ xlators/protocol/client/src/client-callback.c xlators/protocol/client/src/client-handshake.c xlators/protocol/client/src/client-helpers.c xlators/protocol/client/src/client-lk.c xlators/protocol/client/src/client-mem-types.h xlators/protocol/client/src/client.c xlators/protocol/client/src/client.h xlators/protocol/client/src/client3_1-fops.c ¹ Copyright only, license reverted to original Change-Id: If560e826c61b6b26f8b9af7bed6e4bcbaeba31a8 BUG: 820551 Signed-off-by: Kaleb KEITHLEY <kkeithle@redhat.com> Reviewed-on: http://review.gluster.com/3304 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Vijay Bellur <vijay@gluster.com>
* core: adding extra data for fopsAmar Tumballi2012-03-221-45/+70
| | | | | | | | | | | | | with this change, the xlator APIs will have a dictionary as extra argument, which is passed between all the layers. This can be utilized for overloading in some of the operations. Change-Id: I58a8186b3ef647650280e63f3e5e9b9de7827b40 Signed-off-by: Amar Tumballi <amarts@redhat.com> BUG: 782265 Reviewed-on: http://review.gluster.com/2960 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Anand Avati <avati@redhat.com>
* cluster/afr: copy the parent's gfid from child loc while building parent locRaghavendra Bhat2012-03-021-0/+2
| | | | | | | | | | | | | | | | | | | | Suppose the process is not a fuse or nfs mounted client, and some other process such as rebalance, then after lookups inode would not be linked to the inode table (since the inode was created for rebalance purpose only), thus keeping inode's gfid NULL. And afr while building the parent loc using child loc, does not copy the pargfid present in child'd loc structure. protocol/client will search for the gfid either in loc or in loc->inode and assert if it cannot find the gfid in either of them. Change-Id: I882e449fb8b79d5c69e4a942abcd844dc4d5d30c BUG: 799262 Signed-off-by: Raghavendra Bhat <raghavendrabhat@gluster.com> Reviewed-on: http://review.gluster.com/2857 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Amar Tumballi <amarts@redhat.com> Reviewed-by: Pranith Kumar Karampuri <pranithk@gluster.com>
* cluster/afr: Handle errors in build_parent_locPranith Kumar K2012-03-011-28/+53
| | | | | | | | | BUG: 787671 Change-Id: I0b01b0f9e14a26d757748413dd71909e915c7573 Signed-off-by: Pranith Kumar K <pranithk@gluster.com> Reviewed-on: http://review.gluster.com/2826 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Vijay Bellur <vijay@gluster.com>
* core: utilize mempool for frame->local allocationsAmar Tumballi2012-02-211-8/+8
| | | | | | | | | | | | | | | in each translator, which uses 'frame->local', we are using GF_CALLOC/GF_FREE, which would be costly considering the number of allocation happening in a lifetime of 'fop'. It would be good to utilize the mem pool framework for xlator's local structures, so there is no allocation overhead. Change-Id: Ida6e65039a24d9c219b380aa1c3559f36046dc94 Signed-off-by: Amar Tumballi <amar@gluster.com> BUG: 765336 Reviewed-on: http://review.gluster.com/2772 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Anand Avati <avati@redhat.com>
* core: GFID filehandle based backend and anonymous FDsAnand Avati2012-01-201-3/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 1. What -------- This change introduces an infrastructure change in the filesystem which lets filesystem operation address objects (inodes) just by its GFID. Thus far GFID has been a unique identifier of a user-visible inode. But in terms of addressability the only mechanism thus far has been the backend filesystem path, which could be derived from the GFID only if it was cached in the inode table along with the entire set of dentry ancestry leading up to the root. This change essentially decouples addressability from the namespace. It is no more necessary to be aware of the parent directory to address a file or directory. 2. Why ------- The biggest use case for such a feature is NFS for generating persistent filehandles. So far the technique for generating filehandles in NFS has been to encode path components so that the appropriate inode_t can be repopulated into the inode table by means of a recursive lookup of each component top-down. Another use case is the ability to perform more intelligent self-healing and rebalancing of inodes with hardlinks and also to detect renames. A derived feature from GFID filehandles is anonymous FDs. An anonymous FD is an internal USABLE "fd_t" which does not map to a user opened file descriptor or to an internal ->open()'d fd. The ability to address a file by the GFID eliminates the need to have a persistent ->open()'d fd for the purpose of avoiding the namespace. This improves NFS read/write performance significantly eliminating open/close calls and also fixes some of today's limitations (like keeping an FD open longer than necessary resulting in disk space leakage) 3. How ------- At each storage/posix translator level, every file is hardlinked inside a hidden .glusterfs directory (under the top level export) with the name as the ascii-encoded standard UUID format string. For reasons of performance and scalability there is a two-tier classification of those hardlinks under directories with the initial parts of the UUID string as the directory names. For directories (which cannot be hardlinked), the approach is to use a symlink which dereferences the parent GFID path along with basename of the directory. The parent GFID dereference will in turn be a dereference of the grandparent with the parent's basename, and so on recursively up to the root export. 4. Development --------------- 4a. To leverage the ability to address an inode by its GFID, the technique is to perform a "nameless lookup". This means, to populate a loc_t structure as: loc_t { pargfid: NULL parent: NULL name: NULL path: NULL gfid: GFID to be looked up [out parameter] inode: inode_new () result [in parameter] } and performing such lookup will return in its callback an inode_t populated with the right contexts and a struct iatt which can be used to perform an inode_link () on the inode (without a parent and basename). The inode will now be hashed and linked in the inode table and findable via inode_find(). A fundamental change moving forward is that the primary fields in a loc_t structure are now going to be (pargfid, name) and (gfid) depending on the kind of FOP. So far path had been the primary field for operations. The remaining fields only serve as hints/helpers. 4b. If read/write is to be performed on an inode_t, the approach so far has been to: fd_create(), STACK_WIND(open, fd), fd_bind (in callback) and then perform STACK_WIND(read, fd) etc. With anonymous fds now you can do fd_anonymous (inode), STACK_WIND (read, fd). This results in great boost in performance in the inbuilt NFS server. 5. Misc ------- The inode_ctx_put[2] has been renamed to inode_ctx_set[2] to be consistent with the rest of the codebase. Change-Id: Ie4629edf6bd32a595f4d7f01e90c0a01f16fb12f BUG: 781318 Reviewed-on: http://review.gluster.com/669 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Anand Avati <avati@gluster.com>
* cluster/afr: Handle error cases in local initPranith Kumar K2011-12-281-94/+69
| | | | | | | | | | | | - Fop should unwind with appropriate errno - Local is de-allocated on errors Signed-off-by: Pranith Kumar K <pranithk@gluster.com> Change-Id: I4db40342ae184fe1cc29e51072e8fea72ef2cb15 BUG: 770513 Reviewed-on: http://review.gluster.com/2539 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Vijay Bellur <vijay@gluster.com>
* Add command-line support (but no doc) for enforce-quorum option.Jeff Darcy2011-11-281-8/+8
| | | | | | | | Change-Id: Ia52ddb551e24c27969f7f5fa0f94c1044789731f BUG: 3823 Reviewed-on: http://review.gluster.com/743 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Vijay Bellur <vijay@gluster.com>
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