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Remove vn_set_fs_pwd()/vn_set_pwd() (no need to be at / during insmod)
Per suggestion from @behlendorf in #8777, remove vn_set_fs_pwd() and vn_set_pwd() which are only used in zfs_ioctl.c:_init() while loading zfs.ko. The rest of initialization functions being called here after cwd set to / don't depend on cwd of the process except for spa_config_load(). spa_config_load() uses a relative path ".//etc/zfs/zpool.cache" when `rootdir` is non-NULL, which is "/etc/zfs/zpool.cache" given cwd is /, so just unconditionally use the absolute path without "./", so that `vn_set_pwd("/")` as well as the entire functions can be removed. This is also what FreeBSD does. Reviewed-by: Brian Behlendorf <email@example.com> Reviewed-by: Tony Hutter <firstname.lastname@example.org> Signed-off-by: Tomohiro Kusumi <email@example.com> Closes #8826
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