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teach vfs_get_tree() to handle subtype, switch do_new_mount() to it

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Roll the handling of subtypes into do_new_mount() and vfs_get_tree().  The
former determines any subtype string and hangs it off the fs_context; the
latter applies it.

Make do_new_mount() create, parameterise and commit an fs_context and
create a mount for itself rather than calling vfs_kern_mount().

[AV -- missing kstrdup()]
[AV -- ... and no kstrdup() if we get to setting ->s_submount - we
simply transfer it from fc, leaving NULL behind]
[AV -- constify ->s_submount, while we are at it]

Reviewed-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2018-11-04 07:18:51 -05:00
parent 8f2918898e
commit a0c9a8b8fd
3 changed files with 52 additions and 32 deletions
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5
fs/super.c
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@@ -1262,6 +1262,11 @@ int vfs_get_tree(struct fs_context *fc)
sb = fc->root->d_sb;
WARN_ON(!sb->s_bdi);
if (fc->subtype && !sb->s_subtype) {
sb->s_subtype = fc->subtype;
fc->subtype = NULL;
}
/*
* Write barrier is for super_cache_count(). We place it before setting
* SB_BORN as the data dependency between the two functions is the