diff options
Diffstat (limited to 'xlators/performance/open-behind')
| -rw-r--r-- | xlators/performance/open-behind/Makefile.am | 1 | ||||
| -rw-r--r-- | xlators/performance/open-behind/src/Makefile.am | 15 | ||||
| -rw-r--r-- | xlators/performance/open-behind/src/open-behind-mem-types.h | 21 | ||||
| -rw-r--r-- | xlators/performance/open-behind/src/open-behind.c | 920 |
4 files changed, 957 insertions, 0 deletions
diff --git a/xlators/performance/open-behind/Makefile.am b/xlators/performance/open-behind/Makefile.am new file mode 100644 index 00000000000..af437a64d6d --- /dev/null +++ b/xlators/performance/open-behind/Makefile.am @@ -0,0 +1 @@ +SUBDIRS = src diff --git a/xlators/performance/open-behind/src/Makefile.am b/xlators/performance/open-behind/src/Makefile.am new file mode 100644 index 00000000000..e7630ceffc3 --- /dev/null +++ b/xlators/performance/open-behind/src/Makefile.am @@ -0,0 +1,15 @@ +xlator_LTLIBRARIES = open-behind.la +xlatordir = $(libdir)/glusterfs/$(PACKAGE_VERSION)/xlator/performance + +open_behind_la_LDFLAGS = -module -avoidversion + +open_behind_la_SOURCES = open-behind.c +open_behind_la_LIBADD = $(top_builddir)/libglusterfs/src/libglusterfs.la + +noinst_HEADERS = open-behind-mem-types.h + +AM_CPPFLAGS = $(GF_CPPFLAGS) -I$(top_srcdir)/libglusterfs/src + +AM_CFLAGS = -Wall $(GF_CFLAGS) + +CLEANFILES = diff --git a/xlators/performance/open-behind/src/open-behind-mem-types.h b/xlators/performance/open-behind/src/open-behind-mem-types.h new file mode 100644 index 00000000000..1e94296f424 --- /dev/null +++ b/xlators/performance/open-behind/src/open-behind-mem-types.h @@ -0,0 +1,21 @@ +/* + Copyright (c) 2008-2012 Red Hat, Inc. <http://www.redhat.com> + This file is part of GlusterFS. + + This file is licensed to you under your choice of the GNU Lesser + General Public License, version 3 or any later version (LGPLv3 or + later), or the GNU General Public License, version 2 (GPLv2), in all + cases as published by the Free Software Foundation. +*/ + +#ifndef __OB_MEM_TYPES_H__ +#define __OB_MEM_TYPES_H__ + +#include "mem-types.h" + +enum gf_ob_mem_types_ { + gf_ob_mt_fd_t = gf_common_mt_end + 1, + gf_ob_mt_conf_t, + gf_ob_mt_end +}; +#endif diff --git a/xlators/performance/open-behind/src/open-behind.c b/xlators/performance/open-behind/src/open-behind.c new file mode 100644 index 00000000000..e6791973489 --- /dev/null +++ b/xlators/performance/open-behind/src/open-behind.c @@ -0,0 +1,920 @@ +/* + Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com> + This file is part of GlusterFS. + + This file is licensed to you under your choice of the GNU Lesser + General Public License, version 3 or any later version (LGPLv3 or + later), or the GNU General Public License, version 2 (GPLv2), in all + cases as published by the Free Software Foundation. +*/ + +#include "open-behind-mem-types.h" +#include "xlator.h" +#include "statedump.h" +#include "call-stub.h" +#include "defaults.h" + +typedef struct ob_conf { + gf_boolean_t use_anonymous_fd; /* use anonymous FDs wherever safe + e.g - fstat() readv() + + whereas for fops like writev(), lk(), + the fd is important for side effects + like mandatory locks + */ + gf_boolean_t lazy_open; /* delay backend open as much as possible */ +} ob_conf_t; + + +typedef struct ob_fd { + call_frame_t *open_frame; + loc_t loc; + dict_t *xdata; + int flags; + struct list_head list; +} ob_fd_t; + + +ob_fd_t * +__ob_fd_ctx_get (xlator_t *this, fd_t *fd) +{ + uint64_t value = 0; + int ret = -1; + ob_fd_t *ob_fd = NULL; + + ret = __fd_ctx_get (fd, this, &value); + if (ret) + return NULL; + + ob_fd = (void *) ((long) value); + + return ob_fd; +} + + +ob_fd_t * +ob_fd_ctx_get (xlator_t *this, fd_t *fd) +{ + ob_fd_t *ob_fd = NULL; + + LOCK (&fd->lock); + { + ob_fd = __ob_fd_ctx_get (this, fd); + } + UNLOCK (&fd->lock); + + return ob_fd; +} + + +int +__ob_fd_ctx_set (xlator_t *this, fd_t *fd, ob_fd_t *ob_fd) +{ + uint64_t value = 0; + int ret = -1; + + value = (long) ((void *) ob_fd); + + ret = __fd_ctx_set (fd, this, value); + + return ret; +} + + +int +ob_fd_ctx_set (xlator_t *this, fd_t *fd, ob_fd_t *ob_fd) +{ + int ret = -1; + + LOCK (&fd->lock); + { + ret = __ob_fd_ctx_set (this, fd, ob_fd); + } + UNLOCK (&fd->lock); + + return ret; +} + + +ob_fd_t * +ob_fd_new (void) +{ + ob_fd_t *ob_fd = NULL; + + ob_fd = GF_CALLOC (1, sizeof (*ob_fd), gf_ob_mt_fd_t); + + INIT_LIST_HEAD (&ob_fd->list); + + return ob_fd; +} + + +void +ob_fd_free (ob_fd_t *ob_fd) +{ + loc_wipe (&ob_fd->loc); + + if (ob_fd->xdata) + dict_unref (ob_fd->xdata); + + if (ob_fd->open_frame) + STACK_DESTROY (ob_fd->open_frame->root); + + GF_FREE (ob_fd); +} + + +int +ob_wake_cbk (call_frame_t *frame, void *cookie, xlator_t *this, + int op_ret, int op_errno, fd_t *fd_ret, dict_t *xdata) +{ + fd_t *fd = NULL; + struct list_head list; + ob_fd_t *ob_fd = NULL; + call_stub_t *stub = NULL, *tmp = NULL; + + fd = frame->local; + frame->local = NULL; + + LOCK (&fd->lock); + { + ob_fd = __ob_fd_ctx_get (this, fd); + + __fd_ctx_del (fd, this, NULL); + } + UNLOCK (&fd->lock); + + INIT_LIST_HEAD (&list); + + list_splice_init (&ob_fd->list, &list); + + list_for_each_entry_safe (stub, tmp, &list, list) { + list_del_init (&stub->list); + + call_resume (stub); + } + + ob_fd_free (ob_fd); + + fd_unref (fd); + + STACK_DESTROY (frame->root); + + return 0; +} + + +int +ob_fd_wake (xlator_t *this, fd_t *fd) +{ + call_frame_t *frame = NULL; + ob_fd_t *ob_fd = NULL; + + LOCK (&fd->lock); + { + ob_fd = __ob_fd_ctx_get (this, fd); + if (!ob_fd) + goto unlock; + + frame = ob_fd->open_frame; + ob_fd->open_frame = NULL; + } +unlock: + UNLOCK (&fd->lock); + + if (frame) { + frame->local = fd_ref (fd); + + STACK_WIND (frame, ob_wake_cbk, FIRST_CHILD (this), + FIRST_CHILD (this)->fops->open, + &ob_fd->loc, ob_fd->flags, fd, ob_fd->xdata); + } + + return 0; +} + + +int +open_and_resume (xlator_t *this, fd_t *fd, call_stub_t *stub) +{ + ob_fd_t *ob_fd = NULL; + + if (!fd) + goto nofd; + + LOCK (&fd->lock); + { + ob_fd = __ob_fd_ctx_get (this, fd); + if (!ob_fd) + goto unlock; + + list_add_tail (&stub->list, &ob_fd->list); + } +unlock: + UNLOCK (&fd->lock); + +nofd: + if (ob_fd) + ob_fd_wake (this, fd); + else + call_resume (stub); + + return 0; +} + + +int +ob_open_behind (call_frame_t *frame, xlator_t *this, loc_t *loc, int flags, + fd_t *fd, dict_t *xdata) +{ + ob_fd_t *ob_fd = NULL; + int ret = -1; + ob_conf_t *conf = NULL; + + + conf = this->private; + + if (flags & O_TRUNC) { + STACK_WIND (frame, default_open_cbk, + FIRST_CHILD (this), FIRST_CHILD (this)->fops->open, + loc, flags, fd, xdata); + return 0; + } + + ob_fd = ob_fd_new (); + if (!ob_fd) + goto enomem; + + ob_fd->open_frame = copy_frame (frame); + if (!ob_fd->open_frame) + goto enomem; + ret = loc_copy (&ob_fd->loc, loc); + if (ret) + goto enomem; + + ob_fd->flags = flags; + if (xdata) + ob_fd->xdata = dict_ref (xdata); + + ret = ob_fd_ctx_set (this, fd, ob_fd); + if (ret) + goto enomem; + + fd_ref (fd); + + STACK_UNWIND_STRICT (open, frame, 0, 0, fd, xdata); + + if (!conf->lazy_open) + ob_fd_wake (this, fd); + + fd_unref (fd); + + return 0; +enomem: + if (ob_fd) { + if (ob_fd->open_frame) + STACK_DESTROY (ob_fd->open_frame->root); + loc_wipe (&ob_fd->loc); + if (ob_fd->xdata) + dict_unref (ob_fd->xdata); + GF_FREE (ob_fd); + } + + return -1; +} + + +int +ob_open (call_frame_t *frame, xlator_t *this, loc_t *loc, int flags, + fd_t *fd, dict_t *xdata) +{ + fd_t *old_fd = NULL; + int ret = -1; + int op_errno = 0; + call_stub_t *stub = NULL; + + old_fd = fd_lookup (fd->inode, 0); + if (old_fd) { + /* open-behind only when this is the first FD */ + stub = fop_open_stub (frame, default_open_resume, + loc, flags, fd, xdata); + if (!stub) { + op_errno = ENOMEM; + fd_unref (old_fd); + goto err; + } + + open_and_resume (this, old_fd, stub); + + fd_unref (old_fd); + + return 0; + } + + ret = ob_open_behind (frame, this, loc, flags, fd, xdata); + if (ret) { + op_errno = ENOMEM; + goto err; + } + + return 0; +err: + gf_log (this->name, GF_LOG_ERROR, "%s: %s", loc->path, + strerror (op_errno)); + + STACK_UNWIND_STRICT (open, frame, -1, op_errno, 0, 0); + + return 0; +} + + +fd_t * +ob_get_wind_fd (xlator_t *this, fd_t *fd) +{ + ob_conf_t *conf = NULL; + ob_fd_t *ob_fd = NULL; + + conf = this->private; + + ob_fd = ob_fd_ctx_get (this, fd); + + if (ob_fd && conf->use_anonymous_fd) + return fd_anonymous (fd->inode); + + return fd_ref (fd); +} + + +int +ob_readv (call_frame_t *frame, xlator_t *this, fd_t *fd, size_t size, + off_t offset, uint32_t flags, dict_t *xdata) +{ + call_stub_t *stub = NULL; + fd_t *wind_fd = NULL; + + wind_fd = ob_get_wind_fd (this, fd); + + stub = fop_readv_stub (frame, default_readv_resume, wind_fd, + size, offset, flags, xdata); + fd_unref (wind_fd); + + if (!stub) + goto err; + + open_and_resume (this, fd, stub); + + return 0; +err: + STACK_UNWIND_STRICT (readv, frame, -1, ENOMEM, 0, 0, 0, 0, 0); + + return 0; +} + + +int +ob_writev (call_frame_t *frame, xlator_t *this, fd_t *fd, struct iovec *iov, + int count, off_t offset, uint32_t flags, struct iobref *iobref, + dict_t *xdata) +{ + call_stub_t *stub = NULL; + + stub = fop_writev_stub (frame, default_writev_resume, fd, iov, count, + offset, flags, iobref, xdata); + if (!stub) + goto err; + + open_and_resume (this, fd, stub); + + return 0; +err: + STACK_UNWIND_STRICT (writev, frame, -1, ENOMEM, 0, 0, 0); + + return 0; +} + + +int +ob_fstat (call_frame_t *frame, xlator_t *this, fd_t *fd, dict_t *xdata) +{ + call_stub_t *stub = NULL; + fd_t *wind_fd = NULL; + + wind_fd = ob_get_wind_fd (this, fd); + + stub = fop_fstat_stub (frame, default_fstat_resume, wind_fd, xdata); + + fd_unref (wind_fd); + + if (!stub) + goto err; + + open_and_resume (this, fd, stub); + + return 0; +err: + STACK_UNWIND_STRICT (fstat, frame, -1, ENOMEM, 0, 0); + + return 0; +} + + +int +ob_flush (call_frame_t *frame, xlator_t *this, fd_t *fd, dict_t *xdata) +{ + call_stub_t *stub = NULL; + ob_fd_t *ob_fd = NULL; + gf_boolean_t unwind = _gf_false; + + LOCK (&fd->lock); + { + ob_fd = __ob_fd_ctx_get (this, fd); + if (ob_fd && ob_fd->open_frame) + /* if open() was never wound to backend, + no need to wind flush() either. + */ + unwind = _gf_true; + } + UNLOCK (&fd->lock); + + if (unwind) + goto unwind; + + stub = fop_flush_stub (frame, default_flush_resume, fd, xdata); + if (!stub) + goto err; + + open_and_resume (this, fd, stub); + + return 0; +err: + STACK_UNWIND_STRICT (flush, frame, -1, ENOMEM, 0); + + return 0; + +unwind: + STACK_UNWIND_STRICT (flush, frame, 0, 0, 0); + + return 0; +} + + +int +ob_fsync (call_frame_t *frame, xlator_t *this, fd_t *fd, int flag, + dict_t *xdata) +{ + call_stub_t *stub = NULL; + + stub = fop_fsync_stub (frame, default_fsync_resume, fd, flag, xdata); + if (!stub) + goto err; + + open_and_resume (this, fd, stub); + + return 0; +err: + STACK_UNWIND_STRICT (fsync, frame, -1, ENOMEM, 0, 0, 0); + + return 0; +} + + +int +ob_lk (call_frame_t *frame, xlator_t *this, fd_t *fd, int cmd, + struct gf_flock *flock, dict_t *xdata) +{ + call_stub_t *stub = NULL; + + stub = fop_lk_stub (frame, default_lk_resume, fd, cmd, flock, xdata); + if (!stub) + goto err; + + open_and_resume (this, fd, stub); + + return 0; +err: + STACK_UNWIND_STRICT (lk, frame, -1, ENOMEM, 0, 0); + + return 0; +} + +int +ob_ftruncate (call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset, + dict_t *xdata) +{ + call_stub_t *stub = NULL; + + stub = fop_ftruncate_stub (frame, default_ftruncate_resume, fd, offset, + xdata); + if (!stub) + goto err; + + open_and_resume (this, fd, stub); + + return 0; +err: + STACK_UNWIND_STRICT (ftruncate, frame, -1, ENOMEM, 0, 0, 0); + + return 0; +} + + +int +ob_fsetxattr (call_frame_t *frame, xlator_t *this, fd_t *fd, dict_t *xattr, + int flags, dict_t *xdata) +{ + call_stub_t *stub = NULL; + + stub = fop_fsetxattr_stub (frame, default_fsetxattr_resume, fd, xattr, + flags, xdata); + if (!stub) + goto err; + + open_and_resume (this, fd, stub); + + return 0; +err: + STACK_UNWIND_STRICT (fsetxattr, frame, -1, ENOMEM, 0); + + return 0; +} + + +int +ob_fgetxattr (call_frame_t *frame, xlator_t *this, fd_t *fd, const char *name, + dict_t *xdata) +{ + call_stub_t *stub = NULL; + + stub = fop_fgetxattr_stub (frame, default_fgetxattr_resume, fd, name, + xdata); + if (!stub) + goto err; + + open_and_resume (this, fd, stub); + + return 0; +err: + STACK_UNWIND_STRICT (fgetxattr, frame, -1, ENOMEM, 0, 0); + + return 0; +} + + +int +ob_fremovexattr (call_frame_t *frame, xlator_t *this, fd_t *fd, + const char *name, dict_t *xdata) +{ + call_stub_t *stub = NULL; + + stub = fop_fremovexattr_stub (frame, default_fremovexattr_resume, fd, + name, xdata); + if (!stub) + goto err; + + open_and_resume (this, fd, stub); + + return 0; +err: + STACK_UNWIND_STRICT (fremovexattr, frame, -1, ENOMEM, 0); + + return 0; +} + + +int +ob_finodelk (call_frame_t *frame, xlator_t *this, const char *volume, fd_t *fd, + int cmd, struct gf_flock *flock, dict_t *xdata) +{ + call_stub_t *stub = NULL; + + stub = fop_finodelk_stub (frame, default_finodelk_resume, volume, fd, + cmd, flock, xdata); + if (!stub) + goto err; + + open_and_resume (this, fd, stub); + + return 0; +err: + STACK_UNWIND_STRICT (finodelk, frame, -1, ENOMEM, 0); + + return 0; +} + + +int +ob_fentrylk (call_frame_t *frame, xlator_t *this, const char *volume, fd_t *fd, + const char *basename, entrylk_cmd cmd, entrylk_type type, + dict_t *xdata) +{ + call_stub_t *stub = NULL; + + stub = fop_fentrylk_stub (frame, default_fentrylk_resume, volume, fd, + basename, cmd, type, xdata); + if (!stub) + goto err; + + open_and_resume (this, fd, stub); + + return 0; +err: + STACK_UNWIND_STRICT (fentrylk, frame, -1, ENOMEM, 0); + + return 0; +} + + +int +ob_fxattrop (call_frame_t *frame, xlator_t *this, fd_t *fd, + gf_xattrop_flags_t optype, dict_t *xattr, dict_t *xdata) +{ + call_stub_t *stub = NULL; + + stub = fop_fxattrop_stub (frame, default_fxattrop_resume, fd, optype, + xattr, xdata); + if (!stub) + goto err; + + open_and_resume (this, fd, stub); + + return 0; +err: + STACK_UNWIND_STRICT (fxattrop, frame, -1, ENOMEM, 0, 0); + + return 0; +} + + +int +ob_fsetattr (call_frame_t *frame, xlator_t *this, fd_t *fd, + struct iatt *iatt, int valid, dict_t *xdata) +{ + call_stub_t *stub = NULL; + + stub = fop_fsetattr_stub (frame, default_fsetattr_resume, fd, + iatt, valid, xdata); + if (!stub) + goto err; + + open_and_resume (this, fd, stub); + + return 0; +err: + STACK_UNWIND_STRICT (fsetattr, frame, -1, ENOMEM, 0, 0, 0); + + return 0; +} + + +int +ob_unlink (call_frame_t *frame, xlator_t *this, loc_t *loc, int xflags, + dict_t *xdata) +{ + fd_t *fd = NULL; + call_stub_t *stub = NULL; + + stub = fop_unlink_stub (frame, default_unlink_resume, loc, + xflags, xdata); + if (!stub) + goto err; + + fd = fd_lookup (loc->inode, 0); + + open_and_resume (this, fd, stub); + + return 0; +err: + STACK_UNWIND_STRICT (unlink, frame, -1, ENOMEM, 0, 0, 0); + + return 0; +} + + +int +ob_rename (call_frame_t *frame, xlator_t *this, loc_t *src, loc_t *dst, + dict_t *xdata) +{ + fd_t *fd = NULL; + call_stub_t *stub = NULL; + + stub = fop_rename_stub (frame, default_rename_resume, src, dst, xdata); + if (!stub) + goto err; + + if (dst->inode) + fd = fd_lookup (dst->inode, 0); + + open_and_resume (this, fd, stub); + + return 0; +err: + STACK_UNWIND_STRICT (rename, frame, -1, ENOMEM, 0, 0, 0, 0, 0, 0); + + return 0; +} + + +int +ob_release (xlator_t *this, fd_t *fd) +{ + ob_fd_t *ob_fd = NULL; + + ob_fd = ob_fd_ctx_get (this, fd); + + ob_fd_free (ob_fd); + + return 0; +} + + +int +ob_priv_dump (xlator_t *this) +{ + ob_conf_t *conf = NULL; + char key_prefix[GF_DUMP_MAX_BUF_LEN]; + + conf = this->private; + + if (!conf) + return -1; + + gf_proc_dump_build_key (key_prefix, "xlator.performance.open-behind", + "priv"); + + gf_proc_dump_add_section (key_prefix); + + gf_proc_dump_write ("use_anonymous_fd", "%d", conf->use_anonymous_fd); + + gf_proc_dump_write ("lazy_open", "%d", conf->lazy_open); + + return 0; +} + + +int +ob_fdctx_dump (xlator_t *this, fd_t *fd) +{ + ob_fd_t *ob_fd = NULL; + char key_prefix[GF_DUMP_MAX_BUF_LEN] = {0, }; + int ret = 0; + + ret = TRY_LOCK (&fd->lock); + if (ret) + return 0; + + ob_fd = __ob_fd_ctx_get (this, fd); + if (!ob_fd) { + UNLOCK (&fd->lock); + return 0; + } + + gf_proc_dump_build_key (key_prefix, "xlator.performance.open-behind", + "file"); + gf_proc_dump_add_section (key_prefix); + + gf_proc_dump_write ("fd", "%p", fd); + + gf_proc_dump_write ("open_frame", "%p", ob_fd->open_frame); + + gf_proc_dump_write ("open_frame.root.unique", "%p", + ob_fd->open_frame->root->unique); + + gf_proc_dump_write ("loc.path", "%s", ob_fd->loc.path); + + gf_proc_dump_write ("loc.ino", "%s", uuid_utoa (ob_fd->loc.gfid)); + + gf_proc_dump_write ("flags", "%p", ob_fd->open_frame); + + UNLOCK (&fd->lock); + + return 0; +} + + +int +mem_acct_init (xlator_t *this) +{ + int ret = -1; + + ret = xlator_mem_acct_init (this, gf_ob_mt_end + 1); + + if (ret) + gf_log (this->name, GF_LOG_ERROR, "Memory accounting failed"); + + return ret; +} + + +int +reconfigure (xlator_t *this, dict_t *options) +{ + ob_conf_t *conf = NULL; + int ret = -1; + + conf = this->private; + + GF_OPTION_RECONF ("use-anonymous-fd", conf->use_anonymous_fd, options, + bool, out); + + GF_OPTION_RECONF ("lazy-open", conf->lazy_open, options, bool, out); + + ret = 0; +out: + return ret; +} + + +int +init (xlator_t *this) +{ + ob_conf_t *conf = NULL; + + if (!this->children || this->children->next) { + gf_log (this->name, GF_LOG_ERROR, + "FATAL: volume (%s) not configured with exactly one " + "child", this->name); + return -1; + } + + if (!this->parents) + gf_log (this->name, GF_LOG_WARNING, + "dangling volume. check volfile "); + + conf = GF_CALLOC (1, sizeof (*conf), gf_ob_mt_conf_t); + if (!conf) + goto err; + + GF_OPTION_INIT ("use-anonymous-fd", conf->use_anonymous_fd, bool, err); + + GF_OPTION_INIT ("lazy-open", conf->lazy_open, bool, err); + + this->private = conf; + + return 0; +err: + if (conf) + GF_FREE (conf); + + return -1; +} + + +void +fini (xlator_t *this) +{ + ob_conf_t *conf = NULL; + + conf = this->private; + + GF_FREE (conf); + + return; +} + + +struct xlator_fops fops = { + .open = ob_open, + .readv = ob_readv, + .writev = ob_writev, + .flush = ob_flush, + .fsync = ob_fsync, + .fstat = ob_fstat, + .ftruncate = ob_ftruncate, + .fsetxattr = ob_fsetxattr, + .fgetxattr = ob_fgetxattr, + .fremovexattr = ob_fremovexattr, + .finodelk = ob_finodelk, + .fentrylk = ob_fentrylk, + .fxattrop = ob_fxattrop, + .fsetattr = ob_fsetattr, + .unlink = ob_unlink, + .rename = ob_rename, + .lk = ob_lk, +}; + +struct xlator_cbks cbks = { + .release = ob_release, +}; + +struct xlator_dumpops dumpops = { + .priv = ob_priv_dump, + .fdctx = ob_fdctx_dump, +}; + + +struct volume_options options[] = { + { .key = {"use-anonymous-fd"}, + .type = GF_OPTION_TYPE_BOOL, + .default_value = "yes", + .description = "For read operations, use anonymous FD when " + "original FD is open-behind and not yet opened in the backend.", + }, + { .key = {"lazy-open"}, + .type = GF_OPTION_TYPE_BOOL, + .default_value = "yes", + .description = "Perform open in the backend only when a necessary " + "FOP arrives (e.g writev on the FD, unlink of the file). When option " + "is disabled, perform backend open right after unwinding open().", + }, + +}; |