From 44f4434b1305f6ff47b4f63fafcf39bcea9e4ceb Mon Sep 17 00:00:00 2001
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Date: Mon, 27 Jan 2020 19:01:52 +0100
Subject: [PATCH 081/116] virtiofsd: passthrough_ll: use hashtable
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-id: <20200127190227.40942-78-dgilbert@redhat.com>
Patchwork-id: 93528
O-Subject: [RHEL-AV-8.2 qemu-kvm PATCH 077/112] virtiofsd: passthrough_ll: use hashtable
Bugzilla: 1694164
RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
RH-Acked-by: Sergio Lopez Pascual <slp@redhat.com>
From: Miklos Szeredi <mszeredi@redhat.com>
Improve performance of inode lookup by using a hash table.
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Liu Bo <bo.liu@linux.alibaba.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
(cherry picked from commit bfc50a6e06b10b2f9dbaf6c1a89dd523322e016f)
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
tools/virtiofsd/passthrough_ll.c | 81 ++++++++++++++++++++++------------------
1 file changed, 45 insertions(+), 36 deletions(-)
diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough_ll.c
index b40f287..b176a31 100644
--- a/tools/virtiofsd/passthrough_ll.c
+++ b/tools/virtiofsd/passthrough_ll.c
@@ -84,13 +84,15 @@ struct lo_map {
ssize_t freelist;
};
+struct lo_key {
+ ino_t ino;
+ dev_t dev;
+};
+
struct lo_inode {
- struct lo_inode *next; /* protected by lo->mutex */
- struct lo_inode *prev; /* protected by lo->mutex */
int fd;
bool is_symlink;
- ino_t ino;
- dev_t dev;
+ struct lo_key key;
uint64_t refcount; /* protected by lo->mutex */
fuse_ino_t fuse_ino;
};
@@ -119,7 +121,8 @@ struct lo_data {
int timeout_set;
int readdirplus_set;
int readdirplus_clear;
- struct lo_inode root; /* protected by lo->mutex */
+ struct lo_inode root;
+ GHashTable *inodes; /* protected by lo->mutex */
struct lo_map ino_map; /* protected by lo->mutex */
struct lo_map dirp_map; /* protected by lo->mutex */
struct lo_map fd_map; /* protected by lo->mutex */
@@ -573,7 +576,7 @@ retry:
}
goto fail_unref;
}
- if (stat.st_dev != inode->dev || stat.st_ino != inode->ino) {
+ if (stat.st_dev != inode->key.dev || stat.st_ino != inode->key.ino) {
if (!retries) {
fuse_log(FUSE_LOG_WARNING,
"%s: failed to match last\n", __func__);
@@ -753,19 +756,20 @@ out_err:
static struct lo_inode *lo_find(struct lo_data *lo, struct stat *st)
{
struct lo_inode *p;
- struct lo_inode *ret = NULL;
+ struct lo_key key = {
+ .ino = st->st_ino,
+ .dev = st->st_dev,
+ };
pthread_mutex_lock(&lo->mutex);
- for (p = lo->root.next; p != &lo->root; p = p->next) {
- if (p->ino == st->st_ino && p->dev == st->st_dev) {
- assert(p->refcount > 0);
- ret = p;
- ret->refcount++;
- break;
- }
+ p = g_hash_table_lookup(lo->inodes, &key);
+ if (p) {
+ assert(p->refcount > 0);
+ p->refcount++;
}
pthread_mutex_unlock(&lo->mutex);
- return ret;
+
+ return p;
}
static int lo_do_lookup(fuse_req_t req, fuse_ino_t parent, const char *name,
@@ -810,8 +814,6 @@ static int lo_do_lookup(fuse_req_t req, fuse_ino_t parent, const char *name,
close(newfd);
newfd = -1;
} else {
- struct lo_inode *prev, *next;
-
saverr = ENOMEM;
inode = calloc(1, sizeof(struct lo_inode));
if (!inode) {
@@ -822,17 +824,12 @@ static int lo_do_lookup(fuse_req_t req, fuse_ino_t parent, const char *name,
inode->refcount = 1;
inode->fd = newfd;
newfd = -1;
- inode->ino = e->attr.st_ino;
- inode->dev = e->attr.st_dev;
+ inode->key.ino = e->attr.st_ino;
+ inode->key.dev = e->attr.st_dev;
pthread_mutex_lock(&lo->mutex);
inode->fuse_ino = lo_add_inode_mapping(req, inode);
- prev = &lo->root;
- next = prev->next;
- next->prev = inode;
- inode->next = next;
- inode->prev = prev;
- prev->next = inode;
+ g_hash_table_insert(lo->inodes, &inode->key, inode);
pthread_mutex_unlock(&lo->mutex);
}
e->ino = inode->fuse_ino;
@@ -1162,14 +1159,8 @@ static void unref_inode_lolocked(struct lo_data *lo, struct lo_inode *inode,
assert(inode->refcount >= n);
inode->refcount -= n;
if (!inode->refcount) {
- struct lo_inode *prev, *next;
-
- prev = inode->prev;
- next = inode->next;
- next->prev = prev;
- prev->next = next;
-
lo_map_remove(&lo->ino_map, inode->fuse_ino);
+ g_hash_table_remove(lo->inodes, &inode->key);
pthread_mutex_unlock(&lo->mutex);
close(inode->fd);
free(inode);
@@ -1369,7 +1360,7 @@ static void lo_do_readdir(fuse_req_t req, fuse_ino_t ino, size_t size,
/* Hide root's parent directory */
if (dinode == &lo->root && strcmp(name, "..") == 0) {
- e.attr.st_ino = lo->root.ino;
+ e.attr.st_ino = lo->root.key.ino;
e.attr.st_mode = DT_DIR << 12;
}
@@ -2370,11 +2361,26 @@ static void setup_root(struct lo_data *lo, struct lo_inode *root)
root->is_symlink = false;
root->fd = fd;
- root->ino = stat.st_ino;
- root->dev = stat.st_dev;
+ root->key.ino = stat.st_ino;
+ root->key.dev = stat.st_dev;
root->refcount = 2;
}
+static guint lo_key_hash(gconstpointer key)
+{
+ const struct lo_key *lkey = key;
+
+ return (guint)lkey->ino + (guint)lkey->dev;
+}
+
+static gboolean lo_key_equal(gconstpointer a, gconstpointer b)
+{
+ const struct lo_key *la = a;
+ const struct lo_key *lb = b;
+
+ return la->ino == lb->ino && la->dev == lb->dev;
+}
+
int main(int argc, char *argv[])
{
struct fuse_args args = FUSE_ARGS_INIT(argc, argv);
@@ -2392,7 +2398,7 @@ int main(int argc, char *argv[])
umask(0);
pthread_mutex_init(&lo.mutex, NULL);
- lo.root.next = lo.root.prev = &lo.root;
+ lo.inodes = g_hash_table_new(lo_key_hash, lo_key_equal);
lo.root.fd = -1;
lo.root.fuse_ino = FUSE_ROOT_ID;
lo.cache = CACHE_AUTO;
@@ -2522,6 +2528,9 @@ err_out2:
err_out1:
fuse_opt_free_args(&args);
+ if (lo.inodes) {
+ g_hash_table_destroy(lo.inodes);
+ }
lo_map_destroy(&lo.fd_map);
lo_map_destroy(&lo.dirp_map);
lo_map_destroy(&lo.ino_map);
--
1.8.3.1