"sshfs -o vsock=CID:PORT" will cause sshfs to connect directly to the
given vsock, bypassing ssh, and allowing high performance sshfs mounts
of a VM guest.
Added a secondary check so if a mkdir request fails with EPERM an access request will be tried - returning EEXIST if the access was successful. This matches the correct behaviour expected by applications such as git.
Co-authored-by: Peter Belm <peter.belm@dataalchemist.co.uk>
If ssh is configured to use "Match exec" and the previous working
directory is the mount point, then the shell (bash) hangs calling
stat() on OLDPWD.
Unset OLDPWD so that this doesn't happen.
Fixes#206.
The -o max_conns=N option causes multiple SSH processes and response processing threads to
be created. This means that e.g. reading a large file no longer blocks all access to the
filesystem.
The connection is chosen by checking the per-connection statistics:
1. Choose connection with least outstanding requests; if it's a tie,
2. choose connection with least directory handles; if it's a tie,
3. choose connection with least file handles; if it's a tie,
4. choose connection which has already been established.
The implementation assumes that the max_conns values will be small; it
uses linear search.
Example benchmark:
With single connection:
$ sshfs -o max_conns=1,workaround=nobuflimit ebox: mnt
$ cat mnt/tmp/bigfile > /dev/null &
$ time find mnt > /dev/null
real 1m50.432s
user 0m0.133s
sys 0m0.467s
With multiple connections:
$ ~/in-progress/sshfs/build/sshfs -o max_conns=5,workaround=nobuflimit ebox: mnt
$ cat mnt/tmp/bigfile > /dev/null &
$ time find mnt > /dev/null
real 1m15.338s
user 0m0.142s
sys 0m0.491s
This feature was implemented to large extend by Timo Savola <timo.savola@iki.fi>. Thanks
to CEA.fr for sponsoring the remaining work to complete this feature and integrate it into
SSHFS!
Variables of this kind are created in sshfs_open_common() and freed
in sshfs_release(). Since sshfs_release() calls sshfs_flush(), there
can be no pending write requests before at the time of freeing, so
there is no need for reference counting.
* Use logical not for booleans
Fixes a gcc 7.4.0 complaint:
sshfs.c:1743:28: warning: ‘~’ on a boolean expression [-Wbool-operation]
sshfs.c:1743:28: note: did you mean to use logical not?
* strdup argument to keep it alive after function return
Fixes gcc 7.4.0 complaint:
sshfs.c: In function ‘sshfs_opt_proc’:
sshfs.c:3488:50: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
The standard header for the poll(3) interface is poll.h[0]. This prevents
a warning when building with musl libc:
In file included from sshfs.c:44:
/usr/include/sys/poll.h:1:2: warning: #warning redirecting incorrect #include <sys/poll.h> to <poll.h> [-Wcpp]
#warning redirecting incorrect #include <sys/poll.h> to <poll.h>
^~~~~~~
[0] https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/poll.h.html
Haoxi Tan