Re: [PATCH 01/14] VFS: Add additional RESOLVE_* flags [ver #18]

[Stefan Metzmacher <metze@samba.org>]

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Hi David,

> Add additional RESOLVE_* flags to correspond to AT_* flags that aren't
> currently implemented:
> 
> 	RESOLVE_NO_TRAILING_SYMLINKS    for AT_SYMLINK_NOFOLLOW
> 	RESOLVE_NO_TRAILING_AUTOMOUNTS  for AT_NO_AUTOMOUNT
> 	RESOLVE_EMPTY_PATH              for AT_EMPTY_PATH

Thanks for changing the names!

> This is necessary for fsinfo() to use RESOLVE_* flags instead of AT_* flags
> if the latter are to be considered deprecated for new system calls.
> 
> Also make openat2() handle RESOLVE_NO_TRAILING_SYMLINKS.
> 
> Automounting is currently forced by doing an open(), so adding support to
> openat2() for RESOLVE_NO_TRAILING_AUTOMOUNTS is not trivial.

lookup_flags &= ~LOOKUP_AUTOMOUNT won't work?

At least it should cause EINVAL (or something similar) instead of being
silently ignored. The same applies to RESOLVE_EMPTY_PATH, it should be
handled with some logic or also cause EINVAL.

vfs_statx()/vfs_stat_set_lookup_flags() seems to have a similar logic
using the AT_* flags.

metze


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