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* gfapi: remove unnecessary call to glfs_resolve_base()Anand Avati2013-11-261-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Calling glfs_resolve_base() on the root inode for every resolver invocation is unnecessary and wasteful. Here are the results from running a test program which performs path based operations (creates and deletes 1000 files): Without patch: [root@blackbox ~]# sync [root@blackbox ~]# time ./a.out 1 real 0m4.314s user 0m1.923s sys 0m1.144s [root@blackbox ~]# sync [root@blackbox ~]# time ./a.out 1 real 0m4.383s user 0m1.940s sys 0m1.177s [root@blackbox ~]# sync [root@blackbox ~]# time ./a.out 1 real 0m4.339s user 0m1.863s sys 0m1.129s With patch: [root@blackbox ~]# sync [root@blackbox ~]# time ./a.out 1 real 0m3.005s user 0m1.162s sys 0m0.816s [root@blackbox ~]# sync [root@blackbox ~]# time ./a.out 1 real 0m3.188s user 0m1.222s sys 0m0.867s [root@blackbox ~]# sync [root@blackbox ~]# time ./a.out 1 real 0m2.999s user 0m1.131s sys 0m0.832s Change-Id: Id160a24f44b4dccfcfce99a6f69ddb8938523cd5 BUG: 953694 Signed-off-by: Anand Avati <avati@redhat.com> Reviewed-on: http://review.gluster.org/6321 Tested-by: Gluster Build System <jenkins@build.gluster.com>
* gfapi: wake migration waiters after migrationAnand Avati2013-11-261-0/+3
| | | | | | | | | | | | | Wake call threads which are waiting on migration to complete with a cond_broadcast. Else if any call which arrives right when migration is attempted will end up hanging indefinitely. Change-Id: I7df5298f93998d9a54fb12c16654e62333018ece BUG: 953694 Signed-off-by: Anand Avati <avati@redhat.com> Reviewed-on: http://review.gluster.org/6323 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Vijay Bellur <vbellur@redhat.com>
* api: Fill loc.path and loc.gfid before syncop_open.Raghavendra Talur2013-09-101-0/+9
| | | | | | | | | | | | syncop_open was crashing because of NULL dereference. This fixes that. Change-Id: I4bc48fac2a6c0b15c806cbbb4ae45c67891ab7ed BUG: 1002577 Signed-off-by: Raghavendra Talur <rtalur@redhat.com> Reviewed-on: http://review.gluster.org/5877 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Vijay Bellur <vbellur@redhat.com>
* gfapi: apply an upper bound on nested symlink resolutionAnand Avati2013-09-101-1/+11
| | | | | | | | | | | | | | In case of nested symlink resolution, implement an upper bound on the number of such nested levels the resolver will descend. This limit is arbitrary, and set to 2048 nested levels. Change-Id: I264e5bd60d317eda97f4e6f49bd5d8694f8664a9 BUG: 1004100 Signed-off-by: Anand Avati <avati@redhat.com> Reviewed-on: http://review.gluster.org/5874 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Vijay Bellur <vbellur@redhat.com>
* gfapi: store the open/create flags in fd_t objectPoornima2013-09-101-0/+1
| | | | | | | | | | | | The flags passed on to open and create calls were not being saved in the fd_t object, hence the fd migration was failing. Change-Id: I486bb818477fe4c393d64a711534a082162a0e53 BUG: 1005159 Signed-off-by: Poornima <pgurusid@redhat.com> Reviewed-on: http://review.gluster.org/5873 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Vijay Bellur <vbellur@redhat.com>
* gfapi: handle failures in graph switchesAnand Avati2013-07-301-0/+3
| | | | | | | | | | | | A graph switch failure can potentially result in NULL returned for glfs_active_subvol(). Handle this gracefully in glfs_subvol_done() Change-Id: I6adbd878c354b9ed2314fc71cea4671792efa0a4 BUG: 953694 Signed-off-by: Anand Avati <avati@redhat.com> Reviewed-on: http://review.gluster.org/5427 Reviewed-by: Vijay Bellur <vbellur@redhat.com> Tested-by: Gluster Build System <jenkins@build.gluster.com>
* gfapi: handle graph switch (cwd, fds, locks)Anand Avati2013-06-081-8/+486
| | | | | | | | | | | | | | - Migrate open fds to new graph - Migrate locks held in open fd to new fd - Refresh CWD, so resolution of relative paths happens on refreshed inode (on new graph). Change-Id: I4b18083b9b290107ebda1f917fc85b635ab72fb4 BUG: 953694 Signed-off-by: Anand Avati <avati@redhat.com> Reviewed-on: http://review.gluster.org/5167 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Vijay Bellur <vbellur@redhat.com>
* gfapi: optimistic resolution with ESTALE detectionAnand Avati2013-06-081-25/+42
| | | | | | | | | | | | | | | | | | | Enhance the path resolver to be optimistic. Instead of performing a wasteful ->lookup() fop for every component in every API call, build in speculation logic to consider the previous resolution result temporarily, and if it results in ESTALE either later in the path resolution or in the FOP, then retry resolution with ->lookup() at every level and retry the FOP. This is the same optimistic resolution/retry logic Linux kernel resolver is proposing to use. Change-Id: Iecbc25248754caf0915cd7205910563ff88ce5e7 BUG: 953694 Signed-off-by: Anand Avati <avati@redhat.com> Reviewed-on: http://review.gluster.org/5159 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Vijay Bellur <vbellur@redhat.com>
* gfapi: handle root (/) resolution gracefully for realpath()Anand Avati2013-06-081-1/+4
| | | | | | | | | | | Resolving path of / is crucial for realpath() to work properly. Change-Id: I8a1b482beba37f01afbd20446d9e6f6125f2ec34 BUG: 953694 Signed-off-by: Anand Avati <avati@redhat.com> Reviewed-on: http://review.gluster.org/5152 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Vijay Bellur <vbellur@redhat.com>
* gfapi: support for chdir() and familyAnand Avati2013-06-081-4/+26
| | | | | | | | | | | | Add support for chdir, fchdir, getcwd, realpath equivalents in GFAPI. These are required for the Samba VFS plugin. Change-Id: I91d2db9146994403c98961c489c7640c51d5add2 BUG: 953694 Signed-off-by: Anand Avati <avati@redhat.com> Reviewed-on: http://review.gluster.org/5151 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Vijay Bellur <vbellur@redhat.com>
* gfapi: dict_unref() xattr_req in fop finish instead of dict_destroy()Anand Avati2013-03-071-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | The current way of calling dict_destroy() at the end of an API fop assumes that xattr_req is not stored/ref'd by any translators in the stack. However when translators like DHT store xattr_req in dht_local_t with a dict_ref() and perform dict_unref() in the unwind path, things get subject to a race. The race is between the woken up thread (by syncop_wake) i.e, the gfapi invoking thread and the thread where the FOP was unwound. As the C stack of STACK_UNWIND unwinds back, dht_local_unref() gets invoked within the DHT_STACK_UNWIND macro. This thread attempts dict_unref, which would be "safe" if it wins the race against the gfapi invoking thread. However if the gfapi invoking thread wins the race, it will perform dict_destroy() first and therefore make dict_unref() within dht_local_unref perform a double free. This is the embarrassing on-screen bug which showed up in a roomful of people during the gluster dev summit demo of qemu/libgfapi integration. Change-Id: I284c93de87cdc128d5801f42c84aa87f753090d4 BUG: 839950 Signed-off-by: Anand Avati <avati@redhat.com> Reviewed-on: http://review.gluster.org/4645 Tested-by: Gluster Build System <jenkins@build.gluster.com>
* glfs-resolve: fix resolution of "/"Anand Avati2012-10-031-2/+27
| | | | | | | | | Change-Id: I78d63b39dde14a9a32ea197cf0dedeb5695b35c9 BUG: 839950 Signed-off-by: Anand Avati <avati@redhat.com> Reviewed-on: http://review.gluster.org/4021 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Amar Tumballi <amarts@redhat.com>
* gfapi: fix the failure in glfs_open()Amar Tumballi2012-09-251-1/+1
| | | | | | | | | | | | | * the issue is happening because the resolve_symlink() logic was reversed Change-Id: I10eca14d82e3ebf5a0195d5db1330f9e1a3e2dc4 Signed-off-by: Amar Tumballi <amarts@redhat.com> BUG: 839950 Reviewed-on: http://review.gluster.org/3978 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Jeff Darcy <jdarcy@redhat.com> Reviewed-by: Anand Avati <avati@redhat.com>
* gfapi: add symlink (auto resolution) support in resolverAnand Avati2012-09-171-3/+93
| | | | | | | | | | | | - new internal API glfs_lresolve() for usage with APIs like glfs_lXXXX() (e.g. glfs_lstat()) Change-Id: I61c60af6bda3072f189684ad8ac9815d59f455fc BUG: 839950 Signed-off-by: Anand Avati <avati@redhat.com> Reviewed-on: http://review.gluster.org/3866 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Amar Tumballi <amarts@redhat.com>
* gfapi: API/library for accessing gluster volumesAnand Avati2012-07-181-0/+244
Change-Id: Ie4cbcf91b58218bebf23cf951c313aceeb29f311 BUG: 839950 Signed-off-by: Anand Avati <avati@redhat.com> Reviewed-on: http://review.gluster.com/3664 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Jeff Darcy <jdarcy@redhat.com> Reviewed-by: Kaleb KEITHLEY <kkeithle@redhat.com> Reviewed-by: Bharata B Rao <bharata.rao@gmail.com>
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