From 6602376e3e9e6d9f4f695475569322b61ccc2411 Mon Sep 17 00:00:00 2001 From: Jeff Darcy Date: Thu, 31 Mar 2016 17:15:37 -0400 Subject: dht: add "nuke" functionality for efficient server-side deletion This turns a special xattr into an rmdir with flags set. When that hits the posix translator on the server side, that causes the file/directory to be moved into the special "landfill" directory. From there, the posix janitor thread will take care of deleting it entirely on the server side - traversing it recursively if necessary. A couple of secondary issues were fixed to make this effective. * FUSE now ensures that setxattr values are NUL terminated. * The janitor thread now gets woken up immediately when something is placed in 'landfill' instead of only when file descriptors need to be closed. * The default landfill-emptying interval was reduced to 10s. To use the feature, issue a setxattr something like this: setfattr -n glusterfs.dht.nuke -v "" /mnt/glusterfs/vol/some_dir The value doesn't actually matter; the mere receipt of a request with this key is sufficient. Some day it might be useful to allow setting a required value as a sort of password, so that only those who know it can access the underlying special functionality. Change-Id: I8a343c2cdb40a76d5a06c707191fb67babb8514f Signed-off-by: Jeff Darcy Reviewed-on: http://review.gluster.org/13878 Smoke: Gluster Build System NetBSD-regression: NetBSD Build System CentOS-regression: Gluster Build System Reviewed-by: Raghavendra G --- xlators/storage/posix/src/posix.c | 21 ++++++++++----------- 1 file changed, 10 insertions(+), 11 deletions(-) (limited to 'xlators/storage') diff --git a/xlators/storage/posix/src/posix.c b/xlators/storage/posix/src/posix.c index b5df1d082ee..f72c13d9066 100644 --- a/xlators/storage/posix/src/posix.c +++ b/xlators/storage/posix/src/posix.c @@ -1994,6 +1994,7 @@ posix_rmdir (call_frame_t *frame, xlator_t *this, } else { sprintf (tmp_path, "%s/%s", priv->trash_path, gfid_str); op_ret = sys_rename (real_path, tmp_path); + pthread_cond_signal (&priv->janitor_cond); } } else { op_ret = sys_rmdir (real_path); @@ -6528,7 +6529,6 @@ init (xlator_t *this) int ret = 0; int op_ret = -1; ssize_t size = -1; - int32_t janitor_sleep = 0; uuid_t old_uuid = {0,}; uuid_t dict_uuid = {0,}; uuid_t gfid = {0,}; @@ -6857,16 +6857,9 @@ init (xlator_t *this) } ret = 0; - _private->janitor_sleep_duration = 600; + GF_OPTION_INIT ("janitor-sleep-duration", + _private->janitor_sleep_duration, int32, out); - dict_ret = dict_get_int32 (this->options, "janitor-sleep-duration", - &janitor_sleep); - if (dict_ret == 0) { - gf_msg_debug (this->name, 0, "Setting janitor sleep duration " - "to %d.", janitor_sleep); - - _private->janitor_sleep_duration = janitor_sleep; - } /* performing open dir on brick dir locks the brick dir * and prevents it from being unmounted */ @@ -7105,7 +7098,13 @@ struct volume_options options[] = { { .key = {"background-unlink"}, .type = GF_OPTION_TYPE_BOOL }, { .key = {"janitor-sleep-duration"}, - .type = GF_OPTION_TYPE_INT }, + .type = GF_OPTION_TYPE_INT, + .min = 1, + .validate = GF_OPT_VALIDATE_MIN, + .default_value = "10", + .description = "Interval (in seconds) between times the internal " + "'landfill' directory is emptied." + }, { .key = {"volume-id"}, .type = GF_OPTION_TYPE_ANY }, { .key = {"glusterd-uuid"}, -- cgit