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libzfs: get rid of libzfs_handle::libzfs_mnttab

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All users did a freopen() on it. Even some non-users did!
This is point-less ‒ just open the mtab when needed

If I understand Solaris' getextmntent(3C) correctly, the non-user
freopen()s are very likely an odd, twisted vestigial tail of that ‒
but it's got a completely different calling convention and caching
semantics than any platform we support

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #11868
This commit is contained in:
наб
2021-04-09 00:44:23 +02:00
committed by Brian Behlendorf
parent 74e48f470e
commit 533527725b
7 changed files with 2563 additions and 2713 deletions
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include/libzfs_impl.h
-1
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@@ -48,7 +48,6 @@ extern "C" {
struct libzfs_handle {
int libzfs_error;
int libzfs_fd;
FILE *libzfs_mnttab;
zpool_handle_t *libzfs_pool_handles;
uu_avl_pool_t *libzfs_ns_avlpool;
uu_avl_t *libzfs_ns_avl;