Alyssa Ross f15ec889a9 Return required size when encode_fh size too small ... Quoting <linux/exportfs.h>: > encode_fh() should return the fileid_type on success and on error > returns 255 (if the space needed to encode fh is greater than > @max_len*4 bytes). On error @max_len contains the minimum size (in 4 > byte unit) needed to encode the file handle. ZFS was not setting max_len in the case where the handle was too small. As a result of this, the `t_name_to_handle_at.c' example in name_to_handle_at(2) did not work on ZFS. zfsctl_fid() will itself set max_len if called with a fid that is too small, so if we give zfs_fid() that behavior as well, the fix is quite easy: if the handle is too small, just use a zero-size fid instead of the handle. Tested by running t_name_to_handle_at on a normal file, a directory, a .zfs directory, and a snapshot. Thanks-to: Puck Meerburg <puck@puckipedia.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com> Signed-off-by: Alyssa Ross <hi@alyssa.is> Closes #11995		2021-05-10 12:13:45 -07:00
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freebsd	FreeBSD: Initialize/destroy zp->z_lock	2021-05-10 12:13:12 -07:00
linux	Return required size when encode_fh size too small	2021-05-10 12:13:45 -07:00