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Date: Tue, 13 Jan 2009 15:56:44 +0100
From: Jan Kara <jack@...e.cz>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Cyrus Massoumi <cyrusm@....net>, linux-ext4@...r.kernel.org,
tytso@....edu, adilger@....com, Jan Kara <jack@....cz>
Subject: Re: [PATCH] ext3: remove the BKL in ext3/ioctl.c
> On Thu, 08 Jan 2009 14:54:55 +0100 Cyrus Massoumi <cyrusm@....net> wrote:
>
> > Reformat ext3/ioctl.c to make it look more like ext4/ioctl.c and remove the BKL around ext3_ioctl().
> > Patch is against 2.6.28. Compile tested only.
>
> Looks OK to me.
>
> Jan, it affects quota a little bit: lost bkl coverage around quota
> operations. Does it look OK?
It looks fine to me as well. You can add:
Acked-by: Jan Kara <jack@...e.cz>
Quota shouldn't ever care about BKL, it uses spinlocks for everything
for some time already.
Honza
> From: Cyrus Massoumi <cyrusm@....net>
>
> Reformat ext3/ioctl.c to make it look more like ext4/ioctl.c and remove
> the BKL around ext3_ioctl().
>
> Signed-off-by: Cyrus Massoumi <cyrusm@....net>
> Cc: <linux-ext4@...r.kernel.org>
> Cc: Jan Kara <jack@....cz>
> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> ---
>
> fs/ext3/dir.c | 2 -
> fs/ext3/file.c | 2 -
> fs/ext3/ioctl.c | 59 ++++++++++++--------------------------
> include/linux/ext3_fs.h | 5 +--
> 4 files changed, 24 insertions(+), 44 deletions(-)
>
> diff -puN fs/ext3/dir.c~ext3-remove-the-bkl-in-ext3-ioctlc fs/ext3/dir.c
> --- a/fs/ext3/dir.c~ext3-remove-the-bkl-in-ext3-ioctlc
> +++ a/fs/ext3/dir.c
> @@ -42,7 +42,7 @@ const struct file_operations ext3_dir_op
> .llseek = generic_file_llseek,
> .read = generic_read_dir,
> .readdir = ext3_readdir, /* we take BKL. needed?*/
> - .ioctl = ext3_ioctl, /* BKL held */
> + .unlocked_ioctl = ext3_ioctl,
> #ifdef CONFIG_COMPAT
> .compat_ioctl = ext3_compat_ioctl,
> #endif
> diff -puN fs/ext3/file.c~ext3-remove-the-bkl-in-ext3-ioctlc fs/ext3/file.c
> --- a/fs/ext3/file.c~ext3-remove-the-bkl-in-ext3-ioctlc
> +++ a/fs/ext3/file.c
> @@ -112,7 +112,7 @@ const struct file_operations ext3_file_o
> .write = do_sync_write,
> .aio_read = generic_file_aio_read,
> .aio_write = ext3_file_write,
> - .ioctl = ext3_ioctl,
> + .unlocked_ioctl = ext3_ioctl,
> #ifdef CONFIG_COMPAT
> .compat_ioctl = ext3_compat_ioctl,
> #endif
> diff -puN fs/ext3/ioctl.c~ext3-remove-the-bkl-in-ext3-ioctlc fs/ext3/ioctl.c
> --- a/fs/ext3/ioctl.c~ext3-remove-the-bkl-in-ext3-ioctlc
> +++ a/fs/ext3/ioctl.c
> @@ -15,12 +15,11 @@
> #include <linux/mount.h>
> #include <linux/time.h>
> #include <linux/compat.h>
> -#include <linux/smp_lock.h>
> #include <asm/uaccess.h>
>
> -int ext3_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
> - unsigned long arg)
> +long ext3_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
> {
> + struct inode *inode = filp->f_dentry->d_inode;
> struct ext3_inode_info *ei = EXT3_I(inode);
> unsigned int flags;
> unsigned short rsv_window_size;
> @@ -39,29 +38,25 @@ int ext3_ioctl (struct inode * inode, st
> unsigned int oldflags;
> unsigned int jflag;
>
> + if (!is_owner_or_cap(inode))
> + return -EACCES;
> +
> + if (get_user(flags, (int __user *) arg))
> + return -EFAULT;
> +
> err = mnt_want_write(filp->f_path.mnt);
> if (err)
> return err;
>
> - if (!is_owner_or_cap(inode)) {
> - err = -EACCES;
> - goto flags_out;
> - }
> -
> - if (get_user(flags, (int __user *) arg)) {
> - err = -EFAULT;
> - goto flags_out;
> - }
> -
> flags = ext3_mask_flags(inode->i_mode, flags);
>
> mutex_lock(&inode->i_mutex);
> +
> /* Is it quota file? Do not allow user to mess with it */
> - if (IS_NOQUOTA(inode)) {
> - mutex_unlock(&inode->i_mutex);
> - err = -EPERM;
> + err = -EPERM;
> + if (IS_NOQUOTA(inode))
> goto flags_out;
> - }
> +
> oldflags = ei->i_flags;
>
> /* The JOURNAL_DATA flag is modifiable only by root */
> @@ -74,11 +69,8 @@ int ext3_ioctl (struct inode * inode, st
> * This test looks nicer. Thanks to Pauline Middelink
> */
> if ((flags ^ oldflags) & (EXT3_APPEND_FL | EXT3_IMMUTABLE_FL)) {
> - if (!capable(CAP_LINUX_IMMUTABLE)) {
> - mutex_unlock(&inode->i_mutex);
> - err = -EPERM;
> + if (!capable(CAP_LINUX_IMMUTABLE))
> goto flags_out;
> - }
> }
>
> /*
> @@ -86,17 +78,12 @@ int ext3_ioctl (struct inode * inode, st
> * the relevant capability.
> */
> if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL)) {
> - if (!capable(CAP_SYS_RESOURCE)) {
> - mutex_unlock(&inode->i_mutex);
> - err = -EPERM;
> + if (!capable(CAP_SYS_RESOURCE))
> goto flags_out;
> - }
> }
>
> -
> handle = ext3_journal_start(inode, 1);
> if (IS_ERR(handle)) {
> - mutex_unlock(&inode->i_mutex);
> err = PTR_ERR(handle);
> goto flags_out;
> }
> @@ -116,15 +103,13 @@ int ext3_ioctl (struct inode * inode, st
> err = ext3_mark_iloc_dirty(handle, inode, &iloc);
> flags_err:
> ext3_journal_stop(handle);
> - if (err) {
> - mutex_unlock(&inode->i_mutex);
> - return err;
> - }
> + if (err)
> + goto flags_out;
>
> if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL))
> err = ext3_change_inode_journal_flag(inode, jflag);
> - mutex_unlock(&inode->i_mutex);
> flags_out:
> + mutex_unlock(&inode->i_mutex);
> mnt_drop_write(filp->f_path.mnt);
> return err;
> }
> @@ -140,6 +125,7 @@ flags_out:
>
> if (!is_owner_or_cap(inode))
> return -EPERM;
> +
> err = mnt_want_write(filp->f_path.mnt);
> if (err)
> return err;
> @@ -147,6 +133,7 @@ flags_out:
> err = -EFAULT;
> goto setversion_out;
> }
> +
> handle = ext3_journal_start(inode, 1);
> if (IS_ERR(handle)) {
> err = PTR_ERR(handle);
> @@ -299,9 +286,6 @@ group_add_out:
> #ifdef CONFIG_COMPAT
> long ext3_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
> {
> - struct inode *inode = file->f_path.dentry->d_inode;
> - int ret;
> -
> /* These are just misnamed, they actually get/put from/to user an int */
> switch (cmd) {
> case EXT3_IOC32_GETFLAGS:
> @@ -341,9 +325,6 @@ long ext3_compat_ioctl(struct file *file
> default:
> return -ENOIOCTLCMD;
> }
> - lock_kernel();
> - ret = ext3_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg));
> - unlock_kernel();
> - return ret;
> + return ext3_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
> }
> #endif
> diff -puN include/linux/ext3_fs.h~ext3-remove-the-bkl-in-ext3-ioctlc include/linux/ext3_fs.h
> --- a/include/linux/ext3_fs.h~ext3-remove-the-bkl-in-ext3-ioctlc
> +++ a/include/linux/ext3_fs.h
> @@ -893,9 +893,8 @@ extern int ext3_fiemap(struct inode *ino
> u64 start, u64 len);
>
> /* ioctl.c */
> -extern int ext3_ioctl (struct inode *, struct file *, unsigned int,
> - unsigned long);
> -extern long ext3_compat_ioctl (struct file *, unsigned int, unsigned long);
> +extern long ext3_ioctl(struct file *, unsigned int, unsigned long);
> +extern long ext3_compat_ioctl(struct file *, unsigned int, unsigned long);
>
> /* namei.c */
> extern int ext3_orphan_add(handle_t *, struct inode *);
> _
--
Jan Kara <jack@...e.cz>
SuSE CR Labs
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