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VFS: swap do_ioctl and vfs_ioctl names

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Rename old vfs_ioctl to do_ioctl, because the comment above it clearly
indicates that it is an internal function not to be exported to modules;
therefore it should have a more traditional do_XXX name.  The new do_ioctl
is exported in fs.h but not to modules.

Rename the old do_ioctl to vfs_ioctl because the names vfs_XXX should
preferably be reserved to callable VFS functions which modules may call, as
many other vfs_XXX functions already do.  Export the new vfs_ioctl to GPL
modules so others can use it (including Unionfs and eCryptfs).  Add DocBook
for new vfs_ioctl.

[akpm@linux-foundation.org: fix build]
Signed-off-by: Erez Zadok <ezk@cs.sunysb.edu>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Erez Zadok 2008-02-07 00:13:25 -08:00 committed by Linus Torvalds
parent c9845ff1df
commit deb21db778
3 changed files with 24 additions and 10 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

2
fs/compat_ioctl.c
View file

@ -2986,7 +2986,7 @@ asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
} }
do_ioctl: do_ioctl:
error = vfs_ioctl(filp, fd, cmd, arg); error = do_vfs_ioctl(filp, fd, cmd, arg);
out_fput: out_fput:
fput_light(filp, fput_needed); fput_light(filp, fput_needed);
out: out:

24
fs/ioctl.c
View file

@ -16,7 +16,19 @@
#include <asm/ioctls.h> #include <asm/ioctls.h>
static long do_ioctl(struct file *filp, unsigned int cmd, /**
* vfs_ioctl - call filesystem specific ioctl methods
* @filp: [in] open file to invoke ioctl method on
* @cmd: [in] ioctl command to execute
* @arg: [in/out] command-specific argument for ioctl
*
* Invokes filesystem specific ->unlocked_ioctl, if one exists; otherwise
* invokes * filesystem specific ->ioctl method. If neither method exists,
* returns -ENOTTY.
*
* Returns 0 on success, -errno on error.
*/
long vfs_ioctl(struct file *filp, unsigned int cmd,
unsigned long arg) unsigned long arg)
{ {
int error = -ENOTTY; int error = -ENOTTY;
@ -72,17 +84,17 @@ static int file_ioctl(struct file *filp, unsigned int cmd,
return put_user(i_size_read(inode) - filp->f_pos, p); return put_user(i_size_read(inode) - filp->f_pos, p);
} }
return do_ioctl(filp, cmd, arg); return vfs_ioctl(filp, cmd, arg);
} }
/* /*
* When you add any new common ioctls to the switches above and below * When you add any new common ioctls to the switches above and below
* please update compat_sys_ioctl() too. * please update compat_sys_ioctl() too.
* *
* vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d. * do_vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d.
* It's just a simple helper for sys_ioctl and compat_sys_ioctl. * It's just a simple helper for sys_ioctl and compat_sys_ioctl.
*/ */
int vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd, int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
unsigned long arg) unsigned long arg)
{ {
unsigned int flag; unsigned int flag;
@ -152,7 +164,7 @@ int vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
if (S_ISREG(filp->f_path.dentry->d_inode->i_mode)) if (S_ISREG(filp->f_path.dentry->d_inode->i_mode))
error = file_ioctl(filp, cmd, arg); error = file_ioctl(filp, cmd, arg);
else else
error = do_ioctl(filp, cmd, arg); error = vfs_ioctl(filp, cmd, arg);
break; break;
} }
return error; return error;
@ -172,7 +184,7 @@ asmlinkage long sys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
if (error) if (error)
goto out_fput; goto out_fput;
error = vfs_ioctl(filp, fd, cmd, arg); error = do_vfs_ioctl(filp, fd, cmd, arg);
out_fput: out_fput:
fput_light(filp, fput_needed); fput_light(filp, fput_needed);
out: out:

4
include/linux/fs.h
View file

@ -1941,7 +1941,9 @@ extern int vfs_stat_fd(int dfd, char __user *, struct kstat *);
extern int vfs_lstat_fd(int dfd, char __user *, struct kstat *); extern int vfs_lstat_fd(int dfd, char __user *, struct kstat *);
extern int vfs_fstat(unsigned int, struct kstat *); extern int vfs_fstat(unsigned int, struct kstat *);
extern int vfs_ioctl(struct file *, unsigned int, unsigned int, unsigned long); extern long vfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
extern int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
unsigned long arg);
extern void get_filesystem(struct file_system_type *fs); extern void get_filesystem(struct file_system_type *fs);
extern void put_filesystem(struct file_system_type *fs); extern void put_filesystem(struct file_system_type *fs);