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anonfd: Allow making anon files read-only

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It seems a couple places such as arch/ia64/kernel/perfmon.c and
drivers/infiniband/core/uverbs_main.c could use anon_inode_getfile()
instead of a private pseudo-fs + alloc_file(), if only there were a way
to get a read-only file.  So provide this by having anon_inode_getfile()
create a read-only file if we pass O_RDONLY in flags.

Signed-off-by: Roland Dreier <rolandd@cisco.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Roland Dreier 2009-12-18 09:41:24 -08:00 • committed by Al Viro
parent ed2617585f
commit 628ff7c1d8
7 changed files with 17 additions and 9 deletions
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2
fs/eventpoll.c
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@ -1206,7 +1206,7 @@ SYSCALL_DEFINE1(epoll_create1, int, flags)
* a file structure and a free file descriptor.
*/
error = anon_inode_getfd("[eventpoll]", &eventpoll_fops, ep,
flags & O_CLOEXEC);
O_RDWR | (flags & O_CLOEXEC));
if (error < 0)
ep_free(ep);