Re: [PATCH 31/34] vfs: syscall: Add fspick() to select a superblock for reconfiguration [ver #12]
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From: David Howells <dhowells@redhat.com>
Date: 2018-10-17 13:15:01
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linux-fsdevel, lkml
Alan Jenkins [off-list ref] wrote:
Sorry, I guess SB_NOUSER was the wrong word. I was trying find if anything
stopped things like
int memfd = memfd_create("foo", 0);
int fsfd = fspick(memfd, "", FSPICK_EMPTY_PATH);
fsconfig(fsfd, FSCONFIG_SET_FLAG, "ro", NULL, 0);
fsconfig(fsfd, FSCONFIG_SET_STRING, "size", "100M", 0);
fsconfig(fsfd, FSCONFIG_CMD_RECONFIGURE, NULL, NULL, 0);
So far I'm getting -EBUSY if I try to apply the "ro", -EINVAL if I try to
apply the "size=100M". But if I don't apply either, then
FSCONFIG_CMD_RECONFIGURE succeeds.I should probably check that the picked point is actually a mountpoint. David