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In all places where we access or modify a file or it's associated metadata, we
use fsp_get_io_fd() to fetch the low-level fd from the fsp. This ensures we
don't accidentally use a pathref fsp where the fd would be opened as root on
systems lacking O_PATH.
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
We need to be prepared for short writes from the kernel depending on
the state of the page cache.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14361
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
We need to be prepared for short reads from the kernel depending on
the state of the page cache. Windows and Mac clients don't
expect short reads for files, so we need to retry ourself.
For the future we may be able to play with some io_uring flags
in order to avoid the retries in userspace, but for now we just fix
the data corruption bug...
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14361
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
We should never get more acked than we asked for.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14361
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
We should never get back more than we asked for.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14361
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
This can be reused when we add handling for short writes.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14361
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
This can be reused when we add handling for short reads.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14361
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Instead we remember if recursion was triggered and jump to
the start of the function again from the end.
This should make it safe to be called from the completion_fn().
This is hideously complex stuff, so document the hell
out of it.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14361
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
This makes the follow up commits easier as we don't have to care
about overflows.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14361
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
This makes the follow up commits easier as we don't have to care
about overflows.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14361
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
We should do that as early as possible and that's in
vfs_io_uring_fsync_completion().
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14361
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
We should do that as early as possible and that's in
vfs_io_uring_pwrite_completion().
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14361
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
We should do that as early as possible and that's in
vfs_io_uring_pread_completion().
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14361
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
We'll need to add more logic than a simple _tevent_req_done()
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14361
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
We don't need a direct pointer to the state...
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14361
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
The module makes use of the new io_uring infrastructure
(intruduced in linux 5.1), see https://lwn.net/Articles/778411/ and
http://git.kernel.dk/cgit/liburing/
Currently this only implements SMB_VFS_{PREAD,PWRITE,FSYNC}_SEND/RECV
and avoids the overhead of our userspace threadpool.
In future we'll hopefully make more use of more advanced io_uring
features.
For now we don't have automated tests as our test infrastructure
doesn't use a recent kernel. At least we're able to do compile tests
on fedora31.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Stefan Metzmacher <metze@samba.org>
Autobuild-Date(master): Sat Feb 15 11:37:45 UTC 2020 on sn-devel-184
