From: Lukas Czerner Subject: [PATCH 1/2] Add ioctl FITRIM. Date: Wed, 7 Jul 2010 09:53:31 +0200 Message-ID: <1278489212-12110-2-git-send-email-lczerner@redhat.com> References: <1278489212-12110-1-git-send-email-lczerner@redhat.com> Cc: lczerner@redhat.com, jmoyer@redhat.com, rwheeler@redhat.com, linux-ext4@vger.kernel.org, sandeen@redhat.com To: eshishki@redhat.com Return-path: Received: from mx1.redhat.com ([209.132.183.28]:1195 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752792Ab0GGHyD (ORCPT ); Wed, 7 Jul 2010 03:54:03 -0400 Received: from int-mx02.intmail.prod.int.phx2.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) by mx1.redhat.com (8.13.8/8.13.8) with ESMTP id o677s2Ot026214 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Wed, 7 Jul 2010 03:54:02 -0400 In-Reply-To: <1278489212-12110-1-git-send-email-lczerner@redhat.com> Sender: linux-ext4-owner@vger.kernel.org List-ID: Adds an filesystem independent ioctl to allow implementation of file system batched discard support. Signed-off-by: Lukas Czerner --- fs/ioctl.c | 31 +++++++++++++++++++++++++++++++ include/linux/fs.h | 2 ++ 2 files changed, 33 insertions(+), 0 deletions(-) diff --git a/fs/ioctl.c b/fs/ioctl.c index 7faefb4..09b33ae 100644 --- a/fs/ioctl.c +++ b/fs/ioctl.c @@ -551,6 +551,33 @@ static int ioctl_fsthaw(struct file *filp) return thaw_bdev(sb->s_bdev, sb); } +static int ioctl_fstrim(struct file *filp, unsigned long arg) +{ + struct super_block *sb = filp->f_path.dentry->d_inode->i_sb; + unsigned int minlen; + int err; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + /* If filesystem doesn't support trim feature, return. */ + if (sb->s_op->trim_fs == NULL) + return -EOPNOTSUPP; + + /* If a blockdevice-backed filesystem isn't specified, return EINVAL. */ + if (sb->s_bdev == NULL) + return -EINVAL; + + err = get_user(minlen, (unsigned int __user *) arg); + if (err) + return err; + + err = sb->s_op->trim_fs(minlen, sb); + if (err) + return err; + return 0; +} + /* * When you add any new common ioctls to the switches above and below * please update compat_sys_ioctl() too. @@ -601,6 +628,10 @@ int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd, error = ioctl_fsthaw(filp); break; + case FITRIM: + error = ioctl_fstrim(filp, arg); + break; + case FS_IOC_FIEMAP: return ioctl_fiemap(filp, arg); diff --git a/include/linux/fs.h b/include/linux/fs.h index 44f35ae..7a27fa4 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -315,6 +315,7 @@ struct inodes_stat_t { #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */ #define FIFREEZE _IOWR('X', 119, int) /* Freeze */ #define FITHAW _IOWR('X', 120, int) /* Thaw */ +#define FITRIM _IOWR('X', 121, int) /* Trim */ #define FS_IOC_GETFLAGS _IOR('f', 1, long) #define FS_IOC_SETFLAGS _IOW('f', 2, long) @@ -1580,6 +1581,7 @@ struct super_operations { ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t); #endif int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t); + int (*trim_fs) (unsigned int, struct super_block *); }; /* -- 1.6.6.1