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glusterfs/SOURCES/0418-md-cache-avoid-clearin...

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From 7ad8c03a28fca67150972cda964ebe9233766b54 Mon Sep 17 00:00:00 2001
From: Xavi Hernandez <xhernandez@redhat.com>
Date: Mon, 30 Mar 2020 11:09:39 +0200
Subject: [PATCH 418/449] md-cache: avoid clearing cache when not necessary
mdc_inode_xatt_set() blindly cleared current cache when dict was not
NULL, even if there was no xattr requested.
This patch fixes this by only calling mdc_inode_xatt_set() when we have
explicitly requested something to cache.
Backport of:
> Upstream-patch-link: https://review.gluster.org/24267
> Change-Id: Idc91a4693f1ff39f7059acde26682ccc361b947d
> Fixes: #1140
> Signed-off-by: Xavi Hernandez <xhernandez@redhat.com>
BUG: 1815434
Change-Id: Idc91a4693f1ff39f7059acde26682ccc361b947d
Signed-off-by: Xavi Hernandez <xhernandez@redhat.com>
Reviewed-on: https://code.engineering.redhat.com/gerrit/202487
Tested-by: RHGS Build Bot <nigelb@redhat.com>
Reviewed-by: Sunil Kumar Heggodu Gopala Acharya <sheggodu@redhat.com>
---
xlators/performance/md-cache/src/md-cache.c | 165 ++++++++++++++++------------
1 file changed, 93 insertions(+), 72 deletions(-)
diff --git a/xlators/performance/md-cache/src/md-cache.c b/xlators/performance/md-cache/src/md-cache.c
index a6b363f..bbbee3b 100644
--- a/xlators/performance/md-cache/src/md-cache.c
+++ b/xlators/performance/md-cache/src/md-cache.c
@@ -133,6 +133,7 @@ struct mdc_local {
char *key;
dict_t *xattr;
uint64_t incident_time;
+ bool update_cache;
};
int
@@ -969,7 +970,7 @@ out:
return ret;
}
-void
+static bool
mdc_load_reqs(xlator_t *this, dict_t *dict)
{
struct mdc_conf *conf = this->private;
@@ -978,6 +979,7 @@ mdc_load_reqs(xlator_t *this, dict_t *dict)
char *tmp = NULL;
char *tmp1 = NULL;
int ret = 0;
+ bool loaded = false;
tmp1 = conf->mdc_xattr_str;
if (!tmp1)
@@ -995,13 +997,17 @@ mdc_load_reqs(xlator_t *this, dict_t *dict)
conf->mdc_xattr_str = NULL;
gf_msg("md-cache", GF_LOG_ERROR, 0, MD_CACHE_MSG_NO_XATTR_CACHE,
"Disabled cache for xattrs, dict_set failed");
+ goto out;
}
pattern = strtok_r(NULL, ",", &tmp);
}
- GF_FREE(mdc_xattr_str);
+ loaded = true;
+
out:
- return;
+ GF_FREE(mdc_xattr_str);
+
+ return loaded;
}
struct checkpair {
@@ -1092,6 +1098,25 @@ err:
return ret;
}
+static dict_t *
+mdc_prepare_request(xlator_t *this, mdc_local_t *local, dict_t *xdata)
+{
+ if (xdata == NULL) {
+ xdata = dict_new();
+ if (xdata == NULL) {
+ local->update_cache = false;
+
+ return NULL;
+ }
+ } else {
+ dict_ref(xdata);
+ }
+
+ local->update_cache = mdc_load_reqs(this, xdata);
+
+ return xdata;
+}
+
int
mdc_statfs_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
int32_t op_ret, int32_t op_errno, struct statvfs *buf,
@@ -1201,7 +1226,9 @@ mdc_lookup_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
if (local->loc.inode) {
mdc_inode_iatt_set(this, local->loc.inode, stbuf, local->incident_time);
- mdc_inode_xatt_set(this, local->loc.inode, dict);
+ if (local->update_cache) {
+ mdc_inode_xatt_set(this, local->loc.inode, dict);
+ }
}
out:
MDC_STACK_UNWIND(lookup, frame, op_ret, op_errno, inode, stbuf, dict,
@@ -1220,7 +1247,6 @@ mdc_lookup(call_frame_t *frame, xlator_t *this, loc_t *loc, dict_t *xdata)
0,
};
dict_t *xattr_rsp = NULL;
- dict_t *xattr_alloc = NULL;
mdc_local_t *local = NULL;
struct mdc_conf *conf = this->private;
@@ -1271,18 +1297,18 @@ mdc_lookup(call_frame_t *frame, xlator_t *this, loc_t *loc, dict_t *xdata)
return 0;
uncached:
- if (!xdata)
- xdata = xattr_alloc = dict_new();
- if (xdata)
- mdc_load_reqs(this, xdata);
+ xdata = mdc_prepare_request(this, local, xdata);
STACK_WIND(frame, mdc_lookup_cbk, FIRST_CHILD(this),
FIRST_CHILD(this)->fops->lookup, loc, xdata);
if (xattr_rsp)
dict_unref(xattr_rsp);
- if (xattr_alloc)
- dict_unref(xattr_alloc);
+
+ if (xdata != NULL) {
+ dict_unref(xdata);
+ }
+
return 0;
}
@@ -1305,7 +1331,9 @@ mdc_stat_cbk(call_frame_t *frame, void *cookie, xlator_t *this, int32_t op_ret,
}
mdc_inode_iatt_set(this, local->loc.inode, buf, local->incident_time);
- mdc_inode_xatt_set(this, local->loc.inode, xdata);
+ if (local->update_cache) {
+ mdc_inode_xatt_set(this, local->loc.inode, xdata);
+ }
out:
MDC_STACK_UNWIND(stat, frame, op_ret, op_errno, buf, xdata);
@@ -1319,7 +1347,6 @@ mdc_stat(call_frame_t *frame, xlator_t *this, loc_t *loc, dict_t *xdata)
int ret;
struct iatt stbuf;
mdc_local_t *local = NULL;
- dict_t *xattr_alloc = NULL;
struct mdc_conf *conf = this->private;
local = mdc_local_get(frame, loc->inode);
@@ -1343,17 +1370,16 @@ mdc_stat(call_frame_t *frame, xlator_t *this, loc_t *loc, dict_t *xdata)
return 0;
uncached:
- if (!xdata)
- xdata = xattr_alloc = dict_new();
- if (xdata)
- mdc_load_reqs(this, xdata);
+ xdata = mdc_prepare_request(this, local, xdata);
GF_ATOMIC_INC(conf->mdc_counter.stat_miss);
STACK_WIND(frame, mdc_stat_cbk, FIRST_CHILD(this),
FIRST_CHILD(this)->fops->stat, loc, xdata);
- if (xattr_alloc)
- dict_unref(xattr_alloc);
+ if (xdata != NULL) {
+ dict_unref(xdata);
+ }
+
return 0;
}
@@ -1376,7 +1402,9 @@ mdc_fstat_cbk(call_frame_t *frame, void *cookie, xlator_t *this, int32_t op_ret,
}
mdc_inode_iatt_set(this, local->fd->inode, buf, local->incident_time);
- mdc_inode_xatt_set(this, local->fd->inode, xdata);
+ if (local->update_cache) {
+ mdc_inode_xatt_set(this, local->fd->inode, xdata);
+ }
out:
MDC_STACK_UNWIND(fstat, frame, op_ret, op_errno, buf, xdata);
@@ -1390,7 +1418,6 @@ mdc_fstat(call_frame_t *frame, xlator_t *this, fd_t *fd, dict_t *xdata)
int ret;
struct iatt stbuf;
mdc_local_t *local = NULL;
- dict_t *xattr_alloc = NULL;
struct mdc_conf *conf = this->private;
local = mdc_local_get(frame, fd->inode);
@@ -1409,17 +1436,16 @@ mdc_fstat(call_frame_t *frame, xlator_t *this, fd_t *fd, dict_t *xdata)
return 0;
uncached:
- if (!xdata)
- xdata = xattr_alloc = dict_new();
- if (xdata)
- mdc_load_reqs(this, xdata);
+ xdata = mdc_prepare_request(this, local, xdata);
GF_ATOMIC_INC(conf->mdc_counter.stat_miss);
STACK_WIND(frame, mdc_fstat_cbk, FIRST_CHILD(this),
FIRST_CHILD(this)->fops->fstat, fd, xdata);
- if (xattr_alloc)
- dict_unref(xattr_alloc);
+ if (xdata != NULL) {
+ dict_unref(xdata);
+ }
+
return 0;
}
@@ -2393,7 +2419,9 @@ mdc_getxattr_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
goto out;
}
- mdc_inode_xatt_set(this, local->loc.inode, xdata);
+ if (local->update_cache) {
+ mdc_inode_xatt_set(this, local->loc.inode, xdata);
+ }
out:
MDC_STACK_UNWIND(getxattr, frame, op_ret, op_errno, xattr, xdata);
@@ -2410,7 +2438,6 @@ mdc_getxattr(call_frame_t *frame, xlator_t *this, loc_t *loc, const char *key,
mdc_local_t *local = NULL;
dict_t *xattr = NULL;
struct mdc_conf *conf = this->private;
- dict_t *xattr_alloc = NULL;
gf_boolean_t key_satisfied = _gf_true;
local = mdc_local_get(frame, loc->inode);
@@ -2443,18 +2470,17 @@ mdc_getxattr(call_frame_t *frame, xlator_t *this, loc_t *loc, const char *key,
uncached:
if (key_satisfied) {
- if (!xdata)
- xdata = xattr_alloc = dict_new();
- if (xdata)
- mdc_load_reqs(this, xdata);
+ xdata = mdc_prepare_request(this, local, xdata);
}
GF_ATOMIC_INC(conf->mdc_counter.xattr_miss);
STACK_WIND(frame, mdc_getxattr_cbk, FIRST_CHILD(this),
FIRST_CHILD(this)->fops->getxattr, loc, key, xdata);
- if (xattr_alloc)
- dict_unref(xattr_alloc);
+ if (key_satisfied && (xdata != NULL)) {
+ dict_unref(xdata);
+ }
+
return 0;
}
@@ -2481,7 +2507,9 @@ mdc_fgetxattr_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
goto out;
}
- mdc_inode_xatt_set(this, local->fd->inode, xdata);
+ if (local->update_cache) {
+ mdc_inode_xatt_set(this, local->fd->inode, xdata);
+ }
out:
MDC_STACK_UNWIND(fgetxattr, frame, op_ret, op_errno, xattr, xdata);
@@ -2498,7 +2526,6 @@ mdc_fgetxattr(call_frame_t *frame, xlator_t *this, fd_t *fd, const char *key,
dict_t *xattr = NULL;
int op_errno = ENODATA;
struct mdc_conf *conf = this->private;
- dict_t *xattr_alloc = NULL;
gf_boolean_t key_satisfied = _gf_true;
local = mdc_local_get(frame, fd->inode);
@@ -2531,18 +2558,17 @@ mdc_fgetxattr(call_frame_t *frame, xlator_t *this, fd_t *fd, const char *key,
uncached:
if (key_satisfied) {
- if (!xdata)
- xdata = xattr_alloc = dict_new();
- if (xdata)
- mdc_load_reqs(this, xdata);
+ xdata = mdc_prepare_request(this, local, xdata);
}
GF_ATOMIC_INC(conf->mdc_counter.xattr_miss);
STACK_WIND(frame, mdc_fgetxattr_cbk, FIRST_CHILD(this),
FIRST_CHILD(this)->fops->fgetxattr, fd, key, xdata);
- if (xattr_alloc)
- dict_unref(xattr_alloc);
+ if (key_satisfied && (xdata != NULL)) {
+ dict_unref(xdata);
+ }
+
return 0;
}
@@ -2752,27 +2778,22 @@ int
mdc_opendir(call_frame_t *frame, xlator_t *this, loc_t *loc, fd_t *fd,
dict_t *xdata)
{
- dict_t *xattr_alloc = NULL;
mdc_local_t *local = NULL;
local = mdc_local_get(frame, loc->inode);
loc_copy(&local->loc, loc);
- if (!xdata)
- xdata = xattr_alloc = dict_new();
-
- if (xdata) {
- /* Tell readdir-ahead to include these keys in xdata when it
- * internally issues readdirp() in it's opendir_cbk */
- mdc_load_reqs(this, xdata);
- }
+ /* Tell readdir-ahead to include these keys in xdata when it
+ * internally issues readdirp() in it's opendir_cbk */
+ xdata = mdc_prepare_request(this, local, xdata);
STACK_WIND(frame, mdc_opendir_cbk, FIRST_CHILD(this),
FIRST_CHILD(this)->fops->opendir, loc, fd, xdata);
- if (xattr_alloc)
- dict_unref(xattr_alloc);
+ if (xdata != NULL) {
+ dict_unref(xdata);
+ }
return 0;
}
@@ -2800,7 +2821,9 @@ mdc_readdirp_cbk(call_frame_t *frame, void *cookie, xlator_t *this, int op_ret,
continue;
mdc_inode_iatt_set(this, entry->inode, &entry->d_stat,
local->incident_time);
- mdc_inode_xatt_set(this, entry->inode, entry->dict);
+ if (local->update_cache) {
+ mdc_inode_xatt_set(this, entry->inode, entry->dict);
+ }
}
unwind:
@@ -2812,7 +2835,6 @@ int
mdc_readdirp(call_frame_t *frame, xlator_t *this, fd_t *fd, size_t size,
off_t offset, dict_t *xdata)
{
- dict_t *xattr_alloc = NULL;
mdc_local_t *local = NULL;
local = mdc_local_get(frame, fd->inode);
@@ -2821,15 +2843,15 @@ mdc_readdirp(call_frame_t *frame, xlator_t *this, fd_t *fd, size_t size,
local->fd = fd_ref(fd);
- if (!xdata)
- xdata = xattr_alloc = dict_new();
- if (xdata)
- mdc_load_reqs(this, xdata);
+ xdata = mdc_prepare_request(this, local, xdata);
STACK_WIND(frame, mdc_readdirp_cbk, FIRST_CHILD(this),
FIRST_CHILD(this)->fops->readdirp, fd, size, offset, xdata);
- if (xattr_alloc)
- dict_unref(xattr_alloc);
+
+ if (xdata != NULL) {
+ dict_unref(xdata);
+ }
+
return 0;
out:
MDC_STACK_UNWIND(readdirp, frame, -1, ENOMEM, NULL, NULL);
@@ -2860,7 +2882,6 @@ int
mdc_readdir(call_frame_t *frame, xlator_t *this, fd_t *fd, size_t size,
off_t offset, dict_t *xdata)
{
- int need_unref = 0;
mdc_local_t *local = NULL;
struct mdc_conf *conf = this->private;
@@ -2876,19 +2897,14 @@ mdc_readdir(call_frame_t *frame, xlator_t *this, fd_t *fd, size_t size,
return 0;
}
- if (!xdata) {
- xdata = dict_new();
- need_unref = 1;
- }
-
- if (xdata)
- mdc_load_reqs(this, xdata);
+ xdata = mdc_prepare_request(this, local, xdata);
STACK_WIND(frame, mdc_readdirp_cbk, FIRST_CHILD(this),
FIRST_CHILD(this)->fops->readdirp, fd, size, offset, xdata);
- if (need_unref && xdata)
+ if (xdata != NULL) {
dict_unref(xdata);
+ }
return 0;
unwind:
@@ -3468,7 +3484,12 @@ mdc_register_xattr_inval(xlator_t *this)
goto out;
}
- mdc_load_reqs(this, xattr);
+ if (!mdc_load_reqs(this, xattr)) {
+ gf_msg(this->name, GF_LOG_WARNING, ENOMEM, MD_CACHE_MSG_NO_MEMORY,
+ "failed to populate cache entries");
+ ret = -1;
+ goto out;
+ }
frame = create_frame(this, this->ctx->pool);
if (!frame) {
--
1.8.3.1