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| author | Amir Goldstein <amir73il@gmail.com> | 2021-11-29 23:15:32 +0300 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2021-12-15 16:04:33 +0300 |
| commit | 1a9515ac9e55e68d733bab81bd408463ab1e25b1 (patch) | |
| tree | 74d8e8e0208b12e7ce7ce6061a9667b40733bb81 /fs/notify/fanotify/fanotify.h | |
| parent | 2d9374f095136206a02eb0b6cd9ef94632c1e9f7 (diff) | |
| download | linux-1a9515ac9e55e68d733bab81bd408463ab1e25b1.tar.xz | |
fanotify: use helpers to parcel fanotify_info buffer
fanotify_info buffer is parceled into variable sized records, so the
records must be written in order: dir_fh, file_fh, name.
Use helpers to assert that order and make fanotify_alloc_name_event()
a bit more generic to allow empty dir_fh record and to allow expanding
to more records (i.e. name2) soon.
Link: https://lore.kernel.org/r/20211129201537.1932819-7-amir73il@gmail.com
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/notify/fanotify/fanotify.h')
| -rw-r--r-- | fs/notify/fanotify/fanotify.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/fs/notify/fanotify/fanotify.h b/fs/notify/fanotify/fanotify.h index dd23ba659e76..7ac6f9f1e414 100644 --- a/fs/notify/fanotify/fanotify.h +++ b/fs/notify/fanotify/fanotify.h @@ -138,6 +138,26 @@ static inline void fanotify_info_init(struct fanotify_info *info) info->name_len = 0; } +/* These set/copy helpers MUST be called by order */ +static inline void fanotify_info_set_dir_fh(struct fanotify_info *info, + unsigned int totlen) +{ + if (WARN_ON_ONCE(info->file_fh_totlen > 0) || + WARN_ON_ONCE(info->name_len > 0)) + return; + + info->dir_fh_totlen = totlen; +} + +static inline void fanotify_info_set_file_fh(struct fanotify_info *info, + unsigned int totlen) +{ + if (WARN_ON_ONCE(info->name_len > 0)) + return; + + info->file_fh_totlen = totlen; +} + static inline void fanotify_info_copy_name(struct fanotify_info *info, const struct qstr *name) { |