Restructure zfs_readdir() to fix regressions
This does the following:
- It creates a uint8_t type value, which is initialized to DT_DIR on
dot directories and ZFS_DIRENT_TYPE(zap.za_first_integer) otherwise.
This resolves a regression where we return unintialized values as the
directory entry type on dot directories. This was accidentally
introduced by commit 8170d281263e52ff33d7fba93ab625196844df36.
- It restructures zfs_readdir() code to use uint64_t offset like
Illumos instead of loff_t *pos. This resolves a regression where
negative ZAP cursors were treated as if they were dot directories.
- It restructures the function to more closely match the structure of
zfs_readdir() on Illumos and removes the unused variable outcount, which
was only used on Illumos.
Signed-off-by: Richard Yao <ryao@gentoo.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1750