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-rw-r--r--tools/virtiofsd/helper.c3
-rw-r--r--tools/virtiofsd/passthrough_ll.c189
2 files changed, 192 insertions, 0 deletions
diff --git a/tools/virtiofsd/helper.c b/tools/virtiofsd/helper.c
index 567202444a..33749bfcb7 100644
--- a/tools/virtiofsd/helper.c
+++ b/tools/virtiofsd/helper.c
@@ -156,6 +156,9 @@ void fuse_cmdline_help(void)
" allowed (default: 10)\n"
" -o norace disable racy fallback\n"
" default: false\n"
+ " -o posix_lock|no_posix_lock\n"
+ " enable/disable remote posix lock\n"
+ " default: posix_lock\n"
" -o readdirplus|no_readdirplus\n"
" enable/disable readirplus\n"
" default: readdirplus except with "
diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough_ll.c
index 05b5f898db..9414935b52 100644
--- a/tools/virtiofsd/passthrough_ll.c
+++ b/tools/virtiofsd/passthrough_ll.c
@@ -67,6 +67,12 @@
#include "passthrough_helpers.h"
#include "seccomp.h"
+/* Keep track of inode posix locks for each owner. */
+struct lo_inode_plock {
+ uint64_t lock_owner;
+ int fd; /* fd for OFD locks */
+};
+
struct lo_map_elem {
union {
struct lo_inode *inode;
@@ -95,6 +101,8 @@ struct lo_inode {
struct lo_key key;
uint64_t refcount; /* protected by lo->mutex */
fuse_ino_t fuse_ino;
+ pthread_mutex_t plock_mutex;
+ GHashTable *posix_locks; /* protected by lo_inode->plock_mutex */
};
struct lo_cred {
@@ -114,6 +122,7 @@ struct lo_data {
int norace;
int writeback;
int flock;
+ int posix_lock;
int xattr;
char *source;
double timeout;
@@ -137,6 +146,8 @@ static const struct fuse_opt lo_opts[] = {
{ "source=%s", offsetof(struct lo_data, source), 0 },
{ "flock", offsetof(struct lo_data, flock), 1 },
{ "no_flock", offsetof(struct lo_data, flock), 0 },
+ { "posix_lock", offsetof(struct lo_data, posix_lock), 1 },
+ { "no_posix_lock", offsetof(struct lo_data, posix_lock), 0 },
{ "xattr", offsetof(struct lo_data, xattr), 1 },
{ "no_xattr", offsetof(struct lo_data, xattr), 0 },
{ "timeout=%lf", offsetof(struct lo_data, timeout), 0 },
@@ -485,6 +496,17 @@ static void lo_init(void *userdata, struct fuse_conn_info *conn)
fuse_log(FUSE_LOG_DEBUG, "lo_init: activating flock locks\n");
conn->want |= FUSE_CAP_FLOCK_LOCKS;
}
+
+ if (conn->capable & FUSE_CAP_POSIX_LOCKS) {
+ if (lo->posix_lock) {
+ fuse_log(FUSE_LOG_DEBUG, "lo_init: activating posix locks\n");
+ conn->want |= FUSE_CAP_POSIX_LOCKS;
+ } else {
+ fuse_log(FUSE_LOG_DEBUG, "lo_init: disabling posix locks\n");
+ conn->want &= ~FUSE_CAP_POSIX_LOCKS;
+ }
+ }
+
if ((lo->cache == CACHE_NONE && !lo->readdirplus_set) ||
lo->readdirplus_clear) {
fuse_log(FUSE_LOG_DEBUG, "lo_init: disabling readdirplus\n");
@@ -772,6 +794,19 @@ static struct lo_inode *lo_find(struct lo_data *lo, struct stat *st)
return p;
}
+/* value_destroy_func for posix_locks GHashTable */
+static void posix_locks_value_destroy(gpointer data)
+{
+ struct lo_inode_plock *plock = data;
+
+ /*
+ * We had used open() for locks and had only one fd. So
+ * closing this fd should release all OFD locks.
+ */
+ close(plock->fd);
+ free(plock);
+}
+
static int lo_do_lookup(fuse_req_t req, fuse_ino_t parent, const char *name,
struct fuse_entry_param *e)
{
@@ -825,6 +860,9 @@ static int lo_do_lookup(fuse_req_t req, fuse_ino_t parent, const char *name,
newfd = -1;
inode->key.ino = e->attr.st_ino;
inode->key.dev = e->attr.st_dev;
+ pthread_mutex_init(&inode->plock_mutex, NULL);
+ inode->posix_locks = g_hash_table_new_full(
+ g_direct_hash, g_direct_equal, NULL, posix_locks_value_destroy);
pthread_mutex_lock(&lo->mutex);
inode->fuse_ino = lo_add_inode_mapping(req, inode);
@@ -1160,6 +1198,11 @@ static void unref_inode_lolocked(struct lo_data *lo, struct lo_inode *inode,
if (!inode->refcount) {
lo_map_remove(&lo->ino_map, inode->fuse_ino);
g_hash_table_remove(lo->inodes, &inode->key);
+ if (g_hash_table_size(inode->posix_locks)) {
+ fuse_log(FUSE_LOG_WARNING, "Hash table is not empty\n");
+ }
+ g_hash_table_destroy(inode->posix_locks);
+ pthread_mutex_destroy(&inode->plock_mutex);
pthread_mutex_unlock(&lo->mutex);
close(inode->fd);
free(inode);
@@ -1516,6 +1559,136 @@ out:
}
}
+/* Should be called with inode->plock_mutex held */
+static struct lo_inode_plock *lookup_create_plock_ctx(struct lo_data *lo,
+ struct lo_inode *inode,
+ uint64_t lock_owner,
+ pid_t pid, int *err)
+{
+ struct lo_inode_plock *plock;
+ char procname[64];
+ int fd;
+
+ plock =
+ g_hash_table_lookup(inode->posix_locks, GUINT_TO_POINTER(lock_owner));
+
+ if (plock) {
+ return plock;
+ }
+
+ plock = malloc(sizeof(struct lo_inode_plock));
+ if (!plock) {
+ *err = ENOMEM;
+ return NULL;
+ }
+
+ /* Open another instance of file which can be used for ofd locks. */
+ sprintf(procname, "%i", inode->fd);
+
+ /* TODO: What if file is not writable? */
+ fd = openat(lo->proc_self_fd, procname, O_RDWR);
+ if (fd == -1) {
+ *err = errno;
+ free(plock);
+ return NULL;
+ }
+
+ plock->lock_owner = lock_owner;
+ plock->fd = fd;
+ g_hash_table_insert(inode->posix_locks, GUINT_TO_POINTER(plock->lock_owner),
+ plock);
+ return plock;
+}
+
+static void lo_getlk(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi,
+ struct flock *lock)
+{
+ struct lo_data *lo = lo_data(req);
+ struct lo_inode *inode;
+ struct lo_inode_plock *plock;
+ int ret, saverr = 0;
+
+ fuse_log(FUSE_LOG_DEBUG,
+ "lo_getlk(ino=%" PRIu64 ", flags=%d)"
+ " owner=0x%lx, l_type=%d l_start=0x%lx"
+ " l_len=0x%lx\n",
+ ino, fi->flags, fi->lock_owner, lock->l_type, lock->l_start,
+ lock->l_len);
+
+ inode = lo_inode(req, ino);
+ if (!inode) {
+ fuse_reply_err(req, EBADF);
+ return;
+ }
+
+ pthread_mutex_lock(&inode->plock_mutex);
+ plock =
+ lookup_create_plock_ctx(lo, inode, fi->lock_owner, lock->l_pid, &ret);
+ if (!plock) {
+ pthread_mutex_unlock(&inode->plock_mutex);
+ fuse_reply_err(req, ret);
+ return;
+ }
+
+ ret = fcntl(plock->fd, F_OFD_GETLK, lock);
+ if (ret == -1) {
+ saverr = errno;
+ }
+ pthread_mutex_unlock(&inode->plock_mutex);
+
+ if (saverr) {
+ fuse_reply_err(req, saverr);
+ } else {
+ fuse_reply_lock(req, lock);
+ }
+}
+
+static void lo_setlk(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi,
+ struct flock *lock, int sleep)
+{
+ struct lo_data *lo = lo_data(req);
+ struct lo_inode *inode;
+ struct lo_inode_plock *plock;
+ int ret, saverr = 0;
+
+ fuse_log(FUSE_LOG_DEBUG,
+ "lo_setlk(ino=%" PRIu64 ", flags=%d)"
+ " cmd=%d pid=%d owner=0x%lx sleep=%d l_whence=%d"
+ " l_start=0x%lx l_len=0x%lx\n",
+ ino, fi->flags, lock->l_type, lock->l_pid, fi->lock_owner, sleep,
+ lock->l_whence, lock->l_start, lock->l_len);
+
+ if (sleep) {
+ fuse_reply_err(req, EOPNOTSUPP);
+ return;
+ }
+
+ inode = lo_inode(req, ino);
+ if (!inode) {
+ fuse_reply_err(req, EBADF);
+ return;
+ }
+
+ pthread_mutex_lock(&inode->plock_mutex);
+ plock =
+ lookup_create_plock_ctx(lo, inode, fi->lock_owner, lock->l_pid, &ret);
+
+ if (!plock) {
+ pthread_mutex_unlock(&inode->plock_mutex);
+ fuse_reply_err(req, ret);
+ return;
+ }
+
+ /* TODO: Is it alright to modify flock? */
+ lock->l_pid = 0;
+ ret = fcntl(plock->fd, F_OFD_SETLK, lock);
+ if (ret == -1) {
+ saverr = errno;
+ }
+ pthread_mutex_unlock(&inode->plock_mutex);
+ fuse_reply_err(req, saverr);
+}
+
static void lo_fsyncdir(fuse_req_t req, fuse_ino_t ino, int datasync,
struct fuse_file_info *fi)
{
@@ -1617,6 +1790,19 @@ static void lo_flush(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi)
{
int res;
(void)ino;
+ struct lo_inode *inode;
+
+ inode = lo_inode(req, ino);
+ if (!inode) {
+ fuse_reply_err(req, EBADF);
+ return;
+ }
+
+ /* An fd is going away. Cleanup associated posix locks */
+ pthread_mutex_lock(&inode->plock_mutex);
+ g_hash_table_remove(inode->posix_locks, GUINT_TO_POINTER(fi->lock_owner));
+ pthread_mutex_unlock(&inode->plock_mutex);
+
res = close(dup(lo_fi_fd(req, fi)));
fuse_reply_err(req, res == -1 ? errno : 0);
}
@@ -2080,6 +2266,8 @@ static struct fuse_lowlevel_ops lo_oper = {
.releasedir = lo_releasedir,
.fsyncdir = lo_fsyncdir,
.create = lo_create,
+ .getlk = lo_getlk,
+ .setlk = lo_setlk,
.open = lo_open,
.release = lo_release,
.flush = lo_flush,
@@ -2434,6 +2622,7 @@ int main(int argc, char *argv[])
struct lo_data lo = {
.debug = 0,
.writeback = 0,
+ .posix_lock = 1,
.proc_self_fd = -1,
};
struct lo_map_elem *root_elem;
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-03 23:46:24 +0000