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| author | Amir Goldstein <amir73il@gmail.com> | 2023-11-22 15:27:12 +0300 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2023-11-24 12:37:44 +0300 |
| commit | 6ae654392bb516a0baa47fed1f085d84e8cad739 (patch) | |
| tree | 5c8160d36c66b88636e3e1f0e39e82567c0c8976 /fs/read_write.c | |
| parent | b8e1425bae856b189e2365ff795e30fdd9e77049 (diff) | |
| download | linux-6ae654392bb516a0baa47fed1f085d84e8cad739.tar.xz | |
fs: move kiocb_start_write() into vfs_iocb_iter_write()
In vfs code, sb_start_write() is usually called after the permission hook
in rw_verify_area(). vfs_iocb_iter_write() is an exception to this rule,
where kiocb_start_write() is called by its callers.
Move kiocb_start_write() from the callers into vfs_iocb_iter_write()
after the rw_verify_area() checks, to make them "start-write-safe".
The semantics of vfs_iocb_iter_write() is changed, so that the caller is
responsible for calling kiocb_end_write() on completion only if async
iocb was queued. The completion handlers of both callers were adapted
to this semantic change.
This is needed for fanotify "pre content" events.
Suggested-by: Jan Kara <jack@suse.cz>
Suggested-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Link: https://lore.kernel.org/r/20231122122715.2561213-14-amir73il@gmail.com
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'fs/read_write.c')
| -rw-r--r-- | fs/read_write.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/read_write.c b/fs/read_write.c index 9fce8d6968df..92c68ab4f221 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -829,6 +829,10 @@ out: } EXPORT_SYMBOL(vfs_iter_read); +/* + * Caller is responsible for calling kiocb_end_write() on completion + * if async iocb was queued. + */ ssize_t vfs_iocb_iter_write(struct file *file, struct kiocb *iocb, struct iov_iter *iter) { @@ -849,7 +853,10 @@ ssize_t vfs_iocb_iter_write(struct file *file, struct kiocb *iocb, if (ret < 0) return ret; + kiocb_start_write(iocb); ret = call_write_iter(file, iocb, iter); + if (ret != -EIOCBQUEUED) + kiocb_end_write(iocb); if (ret > 0) fsnotify_modify(file); |