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authorAl Viro <viro@zeniv.linux.org.uk>2012-06-24 09:56:45 +0400
committerAl Viro <viro@zeniv.linux.org.uk>2012-07-22 23:57:58 +0400
commit4a9d4b024a3102fc083c925c242d98ac27b1c5f6 (patch)
tree1a4e9d1e86a2c1b70f8352c13da8a7eee97bc5f1 /include/linux/file.h
parenta2d4c71d1559426155e5da8db3265bfa0d8d398d (diff)
switch fput to task_work_add
... and schedule_work() for interrupt/kernel_thread callers (and yes, now it *is* OK to call from interrupt). We are guaranteed that __fput() will be done before we return to userland (or exit). Note that for fput() from a kernel thread we get an async behaviour; it's almost always OK, but sometimes you might need to have __fput() completed before you do anything else. There are two mechanisms for that - a general barrier (flush_delayed_fput()) and explicit __fput_sync(). Both should be used with care (as was the case for fput() from kernel threads all along). See comments in fs/file_table.c for details. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'include/linux/file.h')
-rw-r--r--include/linux/file.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/file.h b/include/linux/file.h
index 58bf158c53d9..a22408bac0d0 100644
--- a/include/linux/file.h
+++ b/include/linux/file.h
@@ -39,4 +39,7 @@ extern void put_unused_fd(unsigned int fd);
extern void fd_install(unsigned int fd, struct file *file);
+extern void flush_delayed_fput(void);
+extern void __fput_sync(struct file *);
+
#endif /* __LINUX_FILE_H */