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fs: add a vfs_fchown helper 

Add a helper for struct file based chown operations.  To be used by
the initramfs code soon.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Hellwig 2020-07-14 08:47:43 +02:00
parent f8456690ba
commit c04011fe8c
2 changed files with 19 additions and 12 deletions
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29
fs/open.c
View File

@ -740,23 +740,28 @@ SYSCALL_DEFINE3(lchown, const char __user *, filename, uid_t, user, gid_t, group
AT_SYMLINK_NOFOLLOW); AT_SYMLINK_NOFOLLOW);
} }
int vfs_fchown(struct file *file, uid_t user, gid_t group)
{
int error;
error = mnt_want_write_file(file);
if (error)
return error;
audit_file(file);
error = chown_common(&file->f_path, user, group);
mnt_drop_write_file(file);
return error;
}
int ksys_fchown(unsigned int fd, uid_t user, gid_t group) int ksys_fchown(unsigned int fd, uid_t user, gid_t group)
{ {
struct fd f = fdget(fd); struct fd f = fdget(fd);
int error = -EBADF; int error = -EBADF;
if (!f.file) if (f.file) {
goto out; error = vfs_fchown(f.file, user, group);
fdput(f);
error = mnt_want_write_file(f.file); }
if (error)
goto out_fput;
audit_file(f.file);
error = chown_common(&f.file->f_path, user, group);
mnt_drop_write_file(f.file);
out_fput:
fdput(f);
out:
return error; return error;
} }

2
include/linux/fs.h
View File

@ -1744,6 +1744,8 @@ int vfs_mkobj(struct dentry *, umode_t,
int (*f)(struct dentry *, umode_t, void *), int (*f)(struct dentry *, umode_t, void *),
void *); void *);
int vfs_fchown(struct file *file, uid_t user, gid_t group);
extern long vfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg); extern long vfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
#ifdef CONFIG_COMPAT #ifdef CONFIG_COMPAT