int fuse_lowlevel_notify_inval_entry(struct fuse_chan *ch, fuse_ino_t parent,
const char *name, size_t namelen)
{
struct fuse_notify_inval_entry_out outarg;
struct fuse_ll *f;
struct iovec iov[3];
if (!ch)
return -EINVAL;
f = (struct fuse_ll *)fuse_session_data(fuse_chan_session(ch));
if (!f)
return -ENODEV;
outarg.parent = parent;
outarg.namelen = namelen;
outarg.padding = 0;
iov[1].iov_base = &outarg;
iov[1].iov_len = sizeof(outarg);
iov[2].iov_base = (void *)name;
iov[2].iov_len = namelen + 1;
return send_notify_iov(f, ch, FUSE_NOTIFY_INVAL_ENTRY, iov, 3);
}
/**
* Rozofs_fuse channel send:
* Since Rozofs operates in non-blocking mode it cannot rely on the
default fuse_kern_chan_send() operation of fuse since if there is
a congestion on the fuse device, the response or notification will
be lost since the caller release the ressource allocated for sending
the response once it returns from fuse_kern_chan_send().
To avoid that issue, rozofs MUST be tracked of the response that has
not been sent and must save it in some internals buffers.
@param ch: fuse channel (contains the reference of the file descriptor to use
@param iov: list of the vectors to send
@param count: number of vectors to send
@retval 0 on success
@retval < 0 on error
*/
int rozofs_fuse_kern_chan_send(struct fuse_chan *ch, const struct iovec iov[],
size_t count)
{
if (iov) {
ssize_t res = writev(fuse_chan_fd(ch), iov, count);
int err = errno;
if (res == -1) {
struct fuse_session *se = fuse_chan_session(ch);
assert(se != NULL);
if(err == EAGAIN)
{
/*
** fuse device is congestion, so we store the reply and assert
** the congestion flag in the rozofs_fuse context
*/
return 0;
}
/* ENOENT means the operation was interrupted */
if (!fuse_session_exited(se) && err != ENOENT)
perror("fuse: writing device");
return -err;
}
}
return 0;
}
/**
* internal function that is called from processing a message that
has been queued on the /dev/fuse socket. That function is
inherited from fuse_kern_chan_receive
@param chp : pointer to the channel
@param buf: pointer to the buffer where data will be copied
@param size : max size of the receive buffer
@retval > 0 : number of byte read
@retval = 0 : session has been exited
@retval < 0 : error
*/
int rozofs_fuse_kern_chan_receive(struct fuse_chan **chp, char *buf,
size_t size)
{
struct fuse_chan *ch = *chp;
int err;
ssize_t res;
struct fuse_session *se = fuse_chan_session(ch);
assert(se != NULL);
restart:
res = read(fuse_chan_fd(ch), buf, size);
if (fuse_session_exited(se))
return 0;
if (res == -1)
{
/* ENOENT means the operation was interrupted, it's safe
to restart */
err = errno;
if (err == ENOENT)
{
rozofs_fuse_req_enoent_count++;
goto restart;
}
if (err == ENODEV) {
severe("Exit from RozofsMount required!!!");
fuse_session_exit(se);
rozofs_exit();
return 0;
}
/* Errors occurring during normal operation: EINTR (read
interrupted), EAGAIN (nonblocking I/O), ENODEV (filesystem
umounted) */
if (err != EINTR && err != EAGAIN) severe("fuse: reading device");
if ((err == EAGAIN)|| (err == EINTR)) rozofs_fuse_req_eagain_count++;
return -err;
}
#if 0
if ((size_t) res < sizeof(struct fuse_in_header)) {
fprintf(stderr, "short read on fuse device\n");
return -EIO;
}
#endif
rozofs_fuse_req_count++;
rozofs_fuse_req_byte_in+=res;
return res;
}
static int fuse_kern_chan_send(struct fuse_chan *ch, const struct iovec iov[],
size_t count)
{
if (iov) {
ssize_t res = writev(fuse_chan_fd(ch), iov, count);
int err = errno;
if (res == -1) {
struct fuse_session *se = fuse_chan_session(ch);
assert(se != NULL);
/* ENOENT means the operation was interrupted */
if (!fuse_session_exited(se) && err != ENOENT)
perror("fuse: writing device");
return -err;
}
}
return 0;
}
int
zfsfuse_newfs(char *mntpoint, struct fuse_chan *ch)
{
fuse_fs_info_t info = { 0 };
info.fd = fuse_chan_fd(ch);
info.bufsize = fuse_chan_bufsize(ch);
info.ch = ch;
info.se = fuse_chan_session(ch);
info.mntlen = strlen(mntpoint);
if(write(newfs_fd[1], &info, sizeof(info)) != sizeof(info)) {
perror("Warning (while writing fsinfo to newfs_fd)");
return -1;
}
if(write(newfs_fd[1], mntpoint, info.mntlen) != info.mntlen) {
perror("Warning (while writing mntpoint to newfs_fd)");
return -1;
}
return 0;
}
static int fuse_kern_chan_receive(struct fuse_chan **chp, char *buf,
size_t size)
{
struct fuse_chan *ch = *chp;
int err;
ssize_t res;
struct fuse_session *se = fuse_chan_session(ch);
assert(se != NULL);
restart:
res = read(fuse_chan_fd(ch), buf, size);
err = errno;
if (fuse_session_exited(se))
return 0;
if (res == -1) {
/* ENOENT means the operation was interrupted, it's safe
to restart */
if (err == ENOENT)
goto restart;
if (err == ENODEV) {
fuse_session_exit(se);
return 0;
}
/* Errors occurring during normal operation: EINTR (read
interrupted), EAGAIN (nonblocking I/O), ENODEV (filesystem
umounted) */
if (err != EINTR && err != EAGAIN)
perror("fuse: reading device");
return -err;
}
if ((size_t) res < sizeof(struct fuse_in_header)) {
fprintf(stderr, "short read on fuse device\n");
return -EIO;
}
return res;
}
int fuse_lowlevel_notify_inval_inode(struct fuse_chan *ch, fuse_ino_t ino,
off_t off, off_t len)
{
struct fuse_notify_inval_inode_out outarg;
struct fuse_ll *f;
struct iovec iov[2];
if (!ch)
return -EINVAL;
f = (struct fuse_ll *)fuse_session_data(fuse_chan_session(ch));
if (!f)
return -ENODEV;
outarg.ino = ino;
outarg.off = off;
outarg.len = len;
iov[1].iov_base = &outarg;
iov[1].iov_len = sizeof(outarg);
return send_notify_iov(f, ch, FUSE_NOTIFY_INVAL_INODE, iov, 2);
}