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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 <[email protected]>
Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Roland Dreier 2009-12-18 09:41:24 -08:00 • committed by Al Viro
commit 628ff7c1d8
7 changed files with 17 additions and 9 deletions
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2
fs/eventfd.c
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@ -339,7 +339,7 @@ struct file *eventfd_file_create(unsigned int count, int flags)
ctx->flags = flags;
file = anon_inode_getfile("[eventfd]", &eventfd_fops, ctx,
flags & EFD_SHARED_FCNTL_FLAGS);
O_RDWR | (flags & EFD_SHARED_FCNTL_FLAGS));
if (IS_ERR(file))
eventfd_free_ctx(ctx);