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authorGreg Kroah-Hartman2019-04-21 23:18:44 +0200
committerGreg Kroah-Hartman2019-04-21 23:18:44 +0200
commit817de6b85914a3dda72b971c074d4d342965fba0 (patch)
treedf0a4563a04aadb8f8595f72392d66d65797c455 /fs/open.c
parentstaging: kpc2000: add initial set of Daktronics drivers (diff)
parentLinux 5.1-rc6 (diff)
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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.c18
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);