fuse: atomic_o_trunc should truncate pagecache

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commit df0e91d488 upstream.

Fuse has an "atomic_o_trunc" mode, where userspace filesystem uses the
O_TRUNC flag in the OPEN request to truncate the file atomically with the
open.

In this mode there's no need to send a SETATTR request to userspace after
the open, so fuse_do_setattr() checks this mode and returns.  But this
misses the important step of truncating the pagecache.

Add the missing parts of truncation to the ATTR_OPEN branch.

Reported-by: Chad Austin <chadaustin@fb.com>
Fixes: 6ff958edbf ("fuse: add atomic open+truncate support")
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

...

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Miklos Szeredi 2018-02-08 15:17:38 +01:00 • committed by Ben Hutchings

parent 05fcfbf99a

commit 902df9f02c

1 changed files with 12 additions and 1 deletions

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fs/fuse/dir.c

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