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author | Greg Kroah-Hartman | 2019-04-21 23:18:44 +0200 |
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committer | Greg Kroah-Hartman | 2019-04-21 23:18:44 +0200 |
commit | 817de6b85914a3dda72b971c074d4d342965fba0 (patch) | |
tree | df0a4563a04aadb8f8595f72392d66d65797c455 /fs/open.c | |
parent | staging: kpc2000: add initial set of Daktronics drivers (diff) | |
parent | Linux 5.1-rc6 (diff) | |
download | kernel-qcow2-linux-817de6b85914a3dda72b971c074d4d342965fba0.tar.gz kernel-qcow2-linux-817de6b85914a3dda72b971c074d4d342965fba0.tar.xz kernel-qcow2-linux-817de6b85914a3dda72b971c074d4d342965fba0.zip |
Merge 5.1-rc6 into staging-next
We want the fixes in here as well as this resolves an iio driver merge
issue.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/open.c')
-rw-r--r-- | fs/open.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/fs/open.c b/fs/open.c index f1c2f855fd43..a00350018a47 100644 --- a/fs/open.c +++ b/fs/open.c @@ -1215,3 +1215,21 @@ int nonseekable_open(struct inode *inode, struct file *filp) } EXPORT_SYMBOL(nonseekable_open); + +/* + * stream_open is used by subsystems that want stream-like file descriptors. + * Such file descriptors are not seekable and don't have notion of position + * (file.f_pos is always 0). Contrary to file descriptors of other regular + * files, .read() and .write() can run simultaneously. + * + * stream_open never fails and is marked to return int so that it could be + * directly used as file_operations.open . + */ +int stream_open(struct inode *inode, struct file *filp) +{ + filp->f_mode &= ~(FMODE_LSEEK | FMODE_PREAD | FMODE_PWRITE | FMODE_ATOMIC_POS); + filp->f_mode |= FMODE_STREAM; + return 0; +} + +EXPORT_SYMBOL(stream_open); |