377 lines
11 KiB
Diff
377 lines
11 KiB
Diff
From: Stefan Hajnoczi <stefanha@redhat.com>
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Date: Mon, 27 Jan 2020 19:01:14 +0000
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Subject: [PATCH] virtiofsd: passthrough_ll: add ino_map to hide lo_inode
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pointers
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Do not expose lo_inode pointers to clients.
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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Reviewed-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
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Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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(cherry picked from commit 92fb57b83cdbfc4bf53c0c46a3d0bcbc36e64126)
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---
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tools/virtiofsd/passthrough_ll.c | 144 ++++++++++++++++++++++++-------
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1 file changed, 114 insertions(+), 30 deletions(-)
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diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough_ll.c
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index e83a976587..a3ebf74eab 100644
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--- a/tools/virtiofsd/passthrough_ll.c
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+++ b/tools/virtiofsd/passthrough_ll.c
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@@ -57,8 +57,8 @@
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#include "passthrough_helpers.h"
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/*
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- * We are re-using pointers to our `struct lo_inode` and `struct
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- * lo_dirp` elements as inodes. This means that we must be able to
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+ * We are re-using pointers to our `struct lo_inode`
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+ * elements as inodes. This means that we must be able to
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* store uintptr_t values in a fuse_ino_t variable. The following
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* incantation checks this condition at compile time.
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*/
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@@ -76,7 +76,7 @@ struct _uintptr_to_must_hold_fuse_ino_t_dummy_struct {
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struct lo_map_elem {
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union {
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- /* Element values will go here... */
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+ struct lo_inode *inode;
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ssize_t freelist;
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};
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bool in_use;
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@@ -97,6 +97,7 @@ struct lo_inode {
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ino_t ino;
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dev_t dev;
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uint64_t refcount; /* protected by lo->mutex */
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+ fuse_ino_t fuse_ino;
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};
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struct lo_cred {
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@@ -121,6 +122,7 @@ struct lo_data {
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int cache;
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int timeout_set;
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struct lo_inode root; /* protected by lo->mutex */
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+ struct lo_map ino_map; /* protected by lo->mutex */
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};
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static const struct fuse_opt lo_opts[] = {
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@@ -145,14 +147,14 @@ static struct lo_data *lo_data(fuse_req_t req)
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return (struct lo_data *)fuse_req_userdata(req);
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}
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-__attribute__((unused)) static void lo_map_init(struct lo_map *map)
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+static void lo_map_init(struct lo_map *map)
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{
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map->elems = NULL;
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map->nelems = 0;
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map->freelist = -1;
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}
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-__attribute__((unused)) static void lo_map_destroy(struct lo_map *map)
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+static void lo_map_destroy(struct lo_map *map)
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{
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free(map->elems);
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}
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@@ -183,8 +185,7 @@ static int lo_map_grow(struct lo_map *map, size_t new_nelems)
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return 1;
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}
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-__attribute__((unused)) static struct lo_map_elem *
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-lo_map_alloc_elem(struct lo_map *map)
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+static struct lo_map_elem *lo_map_alloc_elem(struct lo_map *map)
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{
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struct lo_map_elem *elem;
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@@ -200,8 +201,7 @@ lo_map_alloc_elem(struct lo_map *map)
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return elem;
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}
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-__attribute__((unused)) static struct lo_map_elem *
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-lo_map_reserve(struct lo_map *map, size_t key)
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+static struct lo_map_elem *lo_map_reserve(struct lo_map *map, size_t key)
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{
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ssize_t *prev;
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@@ -222,8 +222,7 @@ lo_map_reserve(struct lo_map *map, size_t key)
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return NULL;
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}
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-__attribute__((unused)) static struct lo_map_elem *
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-lo_map_get(struct lo_map *map, size_t key)
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+static struct lo_map_elem *lo_map_get(struct lo_map *map, size_t key)
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{
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if (key >= map->nelems) {
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return NULL;
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@@ -234,8 +233,7 @@ lo_map_get(struct lo_map *map, size_t key)
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return &map->elems[key];
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}
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-__attribute__((unused)) static void lo_map_remove(struct lo_map *map,
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- size_t key)
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+static void lo_map_remove(struct lo_map *map, size_t key)
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{
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struct lo_map_elem *elem;
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@@ -254,18 +252,40 @@ __attribute__((unused)) static void lo_map_remove(struct lo_map *map,
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map->freelist = key;
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}
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+/* Assumes lo->mutex is held */
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+static ssize_t lo_add_inode_mapping(fuse_req_t req, struct lo_inode *inode)
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+{
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+ struct lo_map_elem *elem;
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+
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+ elem = lo_map_alloc_elem(&lo_data(req)->ino_map);
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+ if (!elem) {
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+ return -1;
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+ }
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+
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+ elem->inode = inode;
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+ return elem - lo_data(req)->ino_map.elems;
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+}
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+
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static struct lo_inode *lo_inode(fuse_req_t req, fuse_ino_t ino)
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{
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- if (ino == FUSE_ROOT_ID) {
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- return &lo_data(req)->root;
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- } else {
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- return (struct lo_inode *)(uintptr_t)ino;
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+ struct lo_data *lo = lo_data(req);
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+ struct lo_map_elem *elem;
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+
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+ pthread_mutex_lock(&lo->mutex);
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+ elem = lo_map_get(&lo->ino_map, ino);
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+ pthread_mutex_unlock(&lo->mutex);
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+
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+ if (!elem) {
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+ return NULL;
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}
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+
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+ return elem->inode;
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}
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static int lo_fd(fuse_req_t req, fuse_ino_t ino)
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{
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- return lo_inode(req, ino)->fd;
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+ struct lo_inode *inode = lo_inode(req, ino);
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+ return inode ? inode->fd : -1;
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}
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static bool lo_debug(fuse_req_t req)
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@@ -337,10 +357,18 @@ static void lo_setattr(fuse_req_t req, fuse_ino_t ino, struct stat *attr,
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{
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int saverr;
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char procname[64];
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- struct lo_inode *inode = lo_inode(req, ino);
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- int ifd = inode->fd;
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+ struct lo_inode *inode;
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+ int ifd;
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int res;
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+ inode = lo_inode(req, ino);
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+ if (!inode) {
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+ fuse_reply_err(req, EBADF);
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+ return;
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+ }
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+
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+ ifd = inode->fd;
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+
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if (valid & FUSE_SET_ATTR_MODE) {
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if (fi) {
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res = fchmod(fi->fh, attr->st_mode);
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@@ -470,6 +498,7 @@ static int lo_do_lookup(fuse_req_t req, fuse_ino_t parent, const char *name,
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inode->dev = e->attr.st_dev;
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pthread_mutex_lock(&lo->mutex);
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+ inode->fuse_ino = lo_add_inode_mapping(req, inode);
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prev = &lo->root;
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next = prev->next;
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next->prev = inode;
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@@ -478,7 +507,7 @@ static int lo_do_lookup(fuse_req_t req, fuse_ino_t parent, const char *name,
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prev->next = inode;
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pthread_mutex_unlock(&lo->mutex);
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}
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- e->ino = (uintptr_t)inode;
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+ e->ino = inode->fuse_ino;
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if (lo_debug(req)) {
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fuse_log(FUSE_LOG_DEBUG, " %lli/%s -> %lli\n",
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@@ -582,10 +611,16 @@ static void lo_mknod_symlink(fuse_req_t req, fuse_ino_t parent,
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{
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int res;
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int saverr;
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- struct lo_inode *dir = lo_inode(req, parent);
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+ struct lo_inode *dir;
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struct fuse_entry_param e;
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struct lo_cred old = {};
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+ dir = lo_inode(req, parent);
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+ if (!dir) {
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+ fuse_reply_err(req, EBADF);
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+ return;
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+ }
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+
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saverr = ENOMEM;
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saverr = lo_change_cred(req, &old);
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@@ -663,10 +698,16 @@ static void lo_link(fuse_req_t req, fuse_ino_t ino, fuse_ino_t parent,
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{
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int res;
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struct lo_data *lo = lo_data(req);
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- struct lo_inode *inode = lo_inode(req, ino);
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+ struct lo_inode *inode;
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struct fuse_entry_param e;
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int saverr;
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+ inode = lo_inode(req, ino);
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+ if (!inode) {
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+ fuse_reply_err(req, EBADF);
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+ return;
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+ }
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+
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memset(&e, 0, sizeof(struct fuse_entry_param));
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e.attr_timeout = lo->timeout;
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e.entry_timeout = lo->timeout;
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@@ -684,7 +725,7 @@ static void lo_link(fuse_req_t req, fuse_ino_t ino, fuse_ino_t parent,
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pthread_mutex_lock(&lo->mutex);
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inode->refcount++;
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pthread_mutex_unlock(&lo->mutex);
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- e.ino = (uintptr_t)inode;
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+ e.ino = inode->fuse_ino;
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if (lo_debug(req)) {
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fuse_log(FUSE_LOG_DEBUG, " %lli/%s -> %lli\n",
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@@ -750,10 +791,10 @@ static void unref_inode(struct lo_data *lo, struct lo_inode *inode, uint64_t n)
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next->prev = prev;
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prev->next = next;
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+ lo_map_remove(&lo->ino_map, inode->fuse_ino);
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pthread_mutex_unlock(&lo->mutex);
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close(inode->fd);
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free(inode);
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-
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} else {
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pthread_mutex_unlock(&lo->mutex);
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}
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@@ -762,7 +803,12 @@ static void unref_inode(struct lo_data *lo, struct lo_inode *inode, uint64_t n)
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static void lo_forget_one(fuse_req_t req, fuse_ino_t ino, uint64_t nlookup)
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{
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struct lo_data *lo = lo_data(req);
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- struct lo_inode *inode = lo_inode(req, ino);
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+ struct lo_inode *inode;
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+
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+ inode = lo_inode(req, ino);
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+ if (!inode) {
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+ return;
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+ }
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if (lo_debug(req)) {
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fuse_log(FUSE_LOG_DEBUG, " forget %lli %lli -%lli\n",
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@@ -1244,10 +1290,16 @@ static void lo_getxattr(fuse_req_t req, fuse_ino_t ino, const char *name,
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{
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char *value = NULL;
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char procname[64];
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- struct lo_inode *inode = lo_inode(req, ino);
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+ struct lo_inode *inode;
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ssize_t ret;
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int saverr;
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+ inode = lo_inode(req, ino);
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+ if (!inode) {
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+ fuse_reply_err(req, EBADF);
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+ return;
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+ }
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+
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saverr = ENOSYS;
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if (!lo_data(req)->xattr) {
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goto out;
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@@ -1306,10 +1358,16 @@ static void lo_listxattr(fuse_req_t req, fuse_ino_t ino, size_t size)
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{
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char *value = NULL;
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char procname[64];
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- struct lo_inode *inode = lo_inode(req, ino);
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+ struct lo_inode *inode;
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ssize_t ret;
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int saverr;
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+ inode = lo_inode(req, ino);
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+ if (!inode) {
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+ fuse_reply_err(req, EBADF);
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+ return;
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+ }
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+
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saverr = ENOSYS;
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if (!lo_data(req)->xattr) {
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goto out;
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@@ -1367,10 +1425,16 @@ static void lo_setxattr(fuse_req_t req, fuse_ino_t ino, const char *name,
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const char *value, size_t size, int flags)
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{
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char procname[64];
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- struct lo_inode *inode = lo_inode(req, ino);
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+ struct lo_inode *inode;
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ssize_t ret;
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int saverr;
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+ inode = lo_inode(req, ino);
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+ if (!inode) {
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+ fuse_reply_err(req, EBADF);
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+ return;
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+ }
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+
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saverr = ENOSYS;
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if (!lo_data(req)->xattr) {
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goto out;
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@@ -1400,10 +1464,16 @@ out:
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static void lo_removexattr(fuse_req_t req, fuse_ino_t ino, const char *name)
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{
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char procname[64];
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- struct lo_inode *inode = lo_inode(req, ino);
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+ struct lo_inode *inode;
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ssize_t ret;
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int saverr;
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+ inode = lo_inode(req, ino);
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+ if (!inode) {
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+ fuse_reply_err(req, EBADF);
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+ return;
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+ }
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+
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saverr = ENOSYS;
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if (!lo_data(req)->xattr) {
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goto out;
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@@ -1522,6 +1592,7 @@ int main(int argc, char *argv[])
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struct fuse_session *se;
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struct fuse_cmdline_opts opts;
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struct lo_data lo = { .debug = 0, .writeback = 0 };
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+ struct lo_map_elem *root_elem;
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int ret = -1;
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/* Don't mask creation mode, kernel already did that */
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@@ -1530,8 +1601,19 @@ int main(int argc, char *argv[])
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pthread_mutex_init(&lo.mutex, NULL);
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lo.root.next = lo.root.prev = &lo.root;
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lo.root.fd = -1;
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+ lo.root.fuse_ino = FUSE_ROOT_ID;
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lo.cache = CACHE_NORMAL;
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+ /*
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+ * Set up the ino map like this:
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+ * [0] Reserved (will not be used)
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+ * [1] Root inode
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+ */
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+ lo_map_init(&lo.ino_map);
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+ lo_map_reserve(&lo.ino_map, 0)->in_use = false;
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+ root_elem = lo_map_reserve(&lo.ino_map, lo.root.fuse_ino);
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+ root_elem->inode = &lo.root;
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+
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if (fuse_parse_cmdline(&args, &opts) != 0) {
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return 1;
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}
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@@ -1628,6 +1710,8 @@ err_out2:
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err_out1:
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fuse_opt_free_args(&args);
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+ lo_map_destroy(&lo.ino_map);
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+
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if (lo.root.fd >= 0) {
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close(lo.root.fd);
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}
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