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Message-Id: <11936184592699-git-send-email-ezk@cs.sunysb.edu> Date: Sun, 28 Oct 2007 20:40:56 -0400 From: Erez Zadok <ezk@...sunysb.edu> To: hch@...radead.org, viro@....linux.org.uk, akpm@...ux-foundation.org Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org, Erez Zadok <ezk@...sunysb.edu> Subject: [PATCH 2/4] VFS: swap do_ioctl and vfs_ioctl names 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. Signed-off-by: Erez Zadok <ezk@...sunysb.edu> --- fs/compat_ioctl.c | 2 +- fs/ioctl.c | 30 ++++++++++++++++++++++-------- include/linux/fs.h | 3 ++- 3 files changed, 25 insertions(+), 10 deletions(-) diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c index a4284cc..a1604ce 100644 --- a/fs/compat_ioctl.c +++ b/fs/compat_ioctl.c @@ -2972,7 +2972,7 @@ asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd, } do_ioctl: - error = vfs_ioctl(filp, fd, cmd, arg); + error = do_ioctl(filp, fd, cmd, arg); out_fput: fput_light(filp, fput_needed); out: diff --git a/fs/ioctl.c b/fs/ioctl.c index 652cacf..34e3f58 100644 --- a/fs/ioctl.c +++ b/fs/ioctl.c @@ -16,8 +16,21 @@ #include <asm/ioctls.h> -static long do_ioctl(struct file *filp, unsigned int cmd, - unsigned long arg) +/** + * 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 ->unlock_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) { int error = -ENOTTY; @@ -39,6 +52,7 @@ static long do_ioctl(struct file *filp, unsigned int cmd, out: return error; } +EXPORT_SYMBOL_GPL(vfs_ioctl); static int file_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) @@ -72,18 +86,18 @@ static int file_ioctl(struct file *filp, unsigned int cmd, 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 * please update compat_sys_ioctl() too. * - * vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d. + * do_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. */ -int vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd, - unsigned long arg) +int do_ioctl(struct file *filp, unsigned int fd, unsigned int cmd, + unsigned long arg) { unsigned int flag; int on, error = 0; @@ -152,7 +166,7 @@ int vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd, if (S_ISREG(filp->f_path.dentry->d_inode->i_mode)) error = file_ioctl(filp, cmd, arg); else - error = do_ioctl(filp, cmd, arg); + error = vfs_ioctl(filp, cmd, arg); break; } return error; @@ -172,7 +186,7 @@ asmlinkage long sys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg) if (error) goto out_fput; - error = vfs_ioctl(filp, fd, cmd, arg); + error = do_ioctl(filp, fd, cmd, arg); out_fput: fput_light(filp, fput_needed); out: diff --git a/include/linux/fs.h b/include/linux/fs.h index b3ec4a4..c0c5d36 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -1924,7 +1924,8 @@ 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_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_ioctl(struct file *, unsigned int, unsigned int, unsigned long); extern void get_filesystem(struct file_system_type *fs); extern void put_filesystem(struct file_system_type *fs); -- 1.5.2.2 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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