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Subject[PATCH 1/2] fs: add ability to attach and to allocate fd for non current tasks
Date

Signed-off-by: Andrew Vagin <avagin@openvz.org>
---
fs/file.c | 9 +++++++--
fs/open.c | 9 +++++++--
include/linux/file.h | 4 ++++
3 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/fs/file.c b/fs/file.c
index 4c6992d..fbf2879 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -428,9 +428,9 @@ struct files_struct init_files = {
/*
* allocate a file descriptor, mark it busy.
*/
-int alloc_fd(unsigned start, unsigned flags)
+int alloc_task_fd(struct task_struct *tsk, unsigned start, unsigned flags)
{
- struct files_struct *files = current->files;
+ struct files_struct *files = tsk->files;
unsigned int fd;
int error;
struct fdtable *fdt;
@@ -479,6 +479,11 @@ out:
return error;
}

+int alloc_fd(unsigned start, unsigned flags)
+{
+ return alloc_task_fd(current, start, flags);
+}
+
int get_unused_fd(void)
{
return alloc_fd(0, 0);
diff --git a/fs/open.c b/fs/open.c
index 22c41b5..9d340cc 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -864,9 +864,9 @@ EXPORT_SYMBOL(put_unused_fd);
* will follow.
*/

-void fd_install(unsigned int fd, struct file *file)
+void fd_task_install(struct task_struct *tsk, unsigned int fd, struct file *file)
{
- struct files_struct *files = current->files;
+ struct files_struct *files = tsk->files;
struct fdtable *fdt;
spin_lock(&files->file_lock);
fdt = files_fdtable(files);
@@ -875,6 +875,11 @@ void fd_install(unsigned int fd, struct file *file)
spin_unlock(&files->file_lock);
}

+void fd_install(unsigned int fd, struct file *file)
+{
+ return fd_task_install(current, fd, file);
+}
+
EXPORT_SYMBOL(fd_install);

static inline int build_open_flags(int flags, int mode, struct open_flags *op)
diff --git a/include/linux/file.h b/include/linux/file.h
index 21a7995..0250cf4 100644
--- a/include/linux/file.h
+++ b/include/linux/file.h
@@ -34,10 +34,14 @@ extern struct file *fget_raw_light(unsigned int fd, int *fput_needed);
extern void set_close_on_exec(unsigned int fd, int flag);
extern void put_filp(struct file *);
extern int alloc_fd(unsigned start, unsigned flags);
+struct task_struct;
+extern int alloc_task_fd(struct task_struct *tsk, unsigned start, unsigned flags);
extern int get_unused_fd(void);
#define get_unused_fd_flags(flags) alloc_fd(0, (flags))
extern void put_unused_fd(unsigned int fd);

+extern void fd_task_install(struct task_struct *tsk,
+ unsigned int fd, struct file *file);
extern void fd_install(unsigned int fd, struct file *file);

#endif /* __LINUX_FILE_H */
--
1.7.1


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