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authorJens Axboe <axboe@kernel.dk>2020-12-17 09:19:10 -0700
committerAl Viro <viro@zeniv.linux.org.uk>2021-01-04 11:42:26 -0500
commit99668f618062816ca7ba639b007eb145b9d3d41e (patch)
tree71b0b572f7e2b7f9b58a35fbd842c1d39ce3ffd8 /fs/open.c
parent6c6ec2b0a3e0381d886d531bd1471dfdb1509237 (diff)
downloadlinux-99668f618062816ca7ba639b007eb145b9d3d41e.tar.bz2
fs: expose LOOKUP_CACHED through openat2() RESOLVE_CACHED
Now that we support non-blocking path resolution internally, expose it via openat2() in the struct open_how ->resolve flags. This allows applications using openat2() to limit path resolution to the extent that it is already cached. If the lookup cannot be satisfied in a non-blocking manner, openat2(2) will return -1/-EAGAIN. Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/open.c')
-rw-r--r--fs/open.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/open.c b/fs/open.c
index 1e06e443a565..ca5444733acd 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -1091,6 +1091,12 @@ inline int build_open_flags(const struct open_how *how, struct open_flags *op)
lookup_flags |= LOOKUP_BENEATH;
if (how->resolve & RESOLVE_IN_ROOT)
lookup_flags |= LOOKUP_IN_ROOT;
+ if (how->resolve & RESOLVE_CACHED) {
+ /* Don't bother even trying for create/truncate/tmpfile open */
+ if (flags & (O_TRUNC | O_CREAT | O_TMPFILE))
+ return -EAGAIN;
+ lookup_flags |= LOOKUP_CACHED;
+ }
op->lookup_flags = lookup_flags;
return 0;