https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253424
Bug ID: 253424
Summary: fusefs: statfs doesn't set f_iosize ("optimal transfer
block size")
Product: Base System
Version: 12.2-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
The FUSE_STATFS response includes fields `bsize` and `frsize`, matching the
Linux statfs fields of the same names:
* f_bsize: optimal transfer block size
* f_frsize: fragment size
The FreeBSD `struct statfs' equivalent fields are:
* f_bsize: filesystem fragment size
* f_iosize: optimal transfer block size
The fusefs driver function `fuse_vfsop_statfs()' copies the fragment size
correctly, but doesn't copy the transfer block size. This causes `statfs()'
calls on a FUSE filesystem to return an incorrect `(struct statfs*)->f_iosize'
value of 65535, instead of whatever the filesystem server returned.
Additionally, during testing, I noticed that the wrapper implementation of
`statvfs()' doesn't propagate `(struct statfs*)->f_namemax' -- it calls
`pathconf(path, _PC_NAME_MAX)' instead, which doesn't return correct values for
FUSE filesystems.
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