fscrypt: new helper function - fscrypt_prepare_lookup_partial()

This patch introduces a new helper function which can be used both in
lookups and in atomic_open operations by filesystems that want to handle
filename encryption and no-key dentries themselves.

The reason for this function to be used in atomic open is that this
operation can act as a lookup if handed a dentry that is negative.  And in
this case we may need to set DCACHE_NOKEY_NAME.

Signed-off-by: Luís Henriques <[email protected]>
Tested-by: Xiubo Li <[email protected]>
Reviewed-by: Xiubo Li <[email protected]>
[ebiggers: improved the function comment, and moved the function to just
           below __fscrypt_prepare_lookup()]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Eric Biggers <[email protected]>

0 files changed, 0 insertions, 0 deletions