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The corresponding bug in OpenSSH has been fixed in
2007 (cf. https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=365541#37), so this shouldn't
be needed anymore.
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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!
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As of kernel 4.14, the FUSE module's + writeback implementation is not
compatible with network filesystems, and there are no imminent plans
to change that.
For more details, see
https://marc.info/?l=fuse-devel&m=150592103107662&w=2 or
As a consequence, the -o unreliable_append option has become obsolete
as well.
Fixes: #93
Fixes: #88
Fixes: #81
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Fixes: #72.
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This commit enables the use of readdir() instead of getdir(). It also
completely disables the cache and the nullpath_ok feature. This will
be fixed in the next commits.
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