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| author | Amir Goldstein <amir73il@gmail.com> | 2020-07-16 11:42:11 +0300 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2020-07-27 21:23:36 +0200 |
| commit | 6ad1aadd970460d81d5e803ac38c0f63f85c0a00 (patch) | |
| tree | db16832321f2745bfd9e0c90c9e723a33e407ae2 | |
| parent | 103ff6a554923e0da54e0a28a686c91facf5bffd (diff) | |
| download | linux-6ad1aadd970460d81d5e803ac38c0f63f85c0a00.tar.bz2 | |
fanotify: distinguish between fid encode error and null fid
In fanotify_encode_fh(), both cases of NULL inode and failure to encode
ended up with fh type FILEID_INVALID.
Distiguish the case of NULL inode, by setting fh type to FILEID_ROOT.
This is just a semantic difference at this point.
Remove stale comment and unneeded check from fid event compare helpers.
Link: https://lore.kernel.org/r/20200716084230.30611-4-amir73il@gmail.com
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
| -rw-r--r-- | fs/notify/fanotify/fanotify.c | 14 |
1 files changed, 4 insertions, 10 deletions
diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c index 84c86a45874c..3dc71a8e795a 100644 --- a/fs/notify/fanotify/fanotify.c +++ b/fs/notify/fanotify/fanotify.c @@ -34,10 +34,6 @@ static bool fanotify_fh_equal(struct fanotify_fh *fh1, if (fh1->type != fh2->type || fh1->len != fh2->len) return false; - /* Do not merge events if we failed to encode fh */ - if (fh1->type == FILEID_INVALID) - return false; - return !fh1->len || !memcmp(fanotify_fh_buf(fh1), fanotify_fh_buf(fh2), fh1->len); } @@ -56,10 +52,7 @@ static bool fanotify_fid_event_equal(struct fanotify_fid_event *ffe1, static bool fanotify_name_event_equal(struct fanotify_name_event *fne1, struct fanotify_name_event *fne2) { - /* - * Do not merge name events without dir fh. - * FAN_DIR_MODIFY does not encode object fh, so it may be empty. - */ + /* Do not merge name events without dir fh */ if (!fne1->dir_fh.len) return false; @@ -290,8 +283,10 @@ static void fanotify_encode_fh(struct fanotify_fh *fh, struct inode *inode, void *buf = fh->buf; int err; + fh->type = FILEID_ROOT; + fh->len = 0; if (!inode) - goto out; + return; dwords = 0; err = -ENOENT; @@ -326,7 +321,6 @@ out_err: type, bytes, err); kfree(ext_buf); *fanotify_fh_ext_buf_ptr(fh) = NULL; -out: /* Report the event without a file identifier on encode error */ fh->type = FILEID_INVALID; fh->len = 0; |