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| author |   Sargun Dhillon <sargun@sargun.me> | 2020-01-07 09:59:24 -0800 |
|---|---|---|
| committer |   Christian Brauner <christian.brauner@ubuntu.com> | 2020-01-13 21:48:42 +0100 |
| commit | 5e876fb43dbf24c941a323139752bcb2f0a80da0 (patch) | |
| tree | 79948c06e4f93aeb83eb698d2409ca4997bd942a /include/linux/file.h | |
| parent | Linux 5.5-rc5 (diff) | |
| download | linux-dev-5e876fb43dbf24c941a323139752bcb2f0a80da0.tar.xz linux-dev-5e876fb43dbf24c941a323139752bcb2f0a80da0.zip | |
vfs, fdtable: Add fget_task helper
This introduces a function which can be used to fetch a file, given an
arbitrary task. As long as the user holds a reference (refcnt) to the
task_struct it is safe to call, and will either return NULL on failure,
or a pointer to the file, with a refcnt.
This patch is based on Oleg Nesterov's (cf. [1]) patch from September
2018.
[1]: Link: https://lore.kernel.org/r/20180915160423.GA31461@redhat.com
Signed-off-by: Sargun Dhillon <sargun@sargun.me>
Suggested-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20200107175927.4558-2-sargun@sargun.me
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Diffstat (limited to 'include/linux/file.h')
| -rw-r--r-- | include/linux/file.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/file.h b/include/linux/file.h index 3fcddff56bc4..c6c7b24ea9f7 100644 --- a/include/linux/file.h +++ b/include/linux/file.h @@ -16,6 +16,7 @@ extern void fput(struct file *); extern void fput_many(struct file *, unsigned int); struct file_operations; +struct task_struct; struct vfsmount; struct dentry; struct inode; @@ -47,6 +48,7 @@ static inline void fdput(struct fd fd) extern struct file *fget(unsigned int fd); extern struct file *fget_many(unsigned int fd, unsigned int refs); extern struct file *fget_raw(unsigned int fd); +extern struct file *fget_task(struct task_struct *task, unsigned int fd); extern unsigned long __fdget(unsigned int fd); extern unsigned long __fdget_raw(unsigned int fd); extern unsigned long __fdget_pos(unsigned int fd); |