From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from userp1040.oracle.com ([156.151.31.81]:22740 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754538Ab2K1MKi (ORCPT ); Wed, 28 Nov 2012 07:10:38 -0500 Received: from ucsinet21.oracle.com (ucsinet21.oracle.com [156.151.31.93]) by userp1040.oracle.com (Sentrion-MTA-4.2.2/Sentrion-MTA-4.2.2) with ESMTP id qASCAbLt027101 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Wed, 28 Nov 2012 12:10:37 GMT Received: from acsmt358.oracle.com (acsmt358.oracle.com [141.146.40.158]) by ucsinet21.oracle.com (8.14.4+Sun/8.14.4) with ESMTP id qASCAaiV002157 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Wed, 28 Nov 2012 12:10:37 GMT Received: from abhmt107.oracle.com (abhmt107.oracle.com [141.146.116.59]) by acsmt358.oracle.com (8.12.11.20060308/8.12.11) with ESMTP id qASCAaTL029477 for ; Wed, 28 Nov 2012 06:10:36 -0600 From: Anand jain To: linux-btrfs@vger.kernel.org Subject: [PATCH v3] Btrfs: add label to snapshot and subvol Date: Wed, 28 Nov 2012 20:15:42 +0800 Message-Id: <1354104942-829-1-git-send-email-Anand.Jain@oracle.com> In-Reply-To: <1354040960-31522-2-git-send-email-Anand.Jain@oracle.com> References: <1354040960-31522-2-git-send-email-Anand.Jain@oracle.com> Sender: linux-btrfs-owner@vger.kernel.org List-ID: From: Anand Jain Signed-off-by: Anand Jain Reviewed-by: Jan Schmidt Reviewed-by: Miao Xie --- fs/btrfs/ctree.h | 12 +++++++++- fs/btrfs/ioctl.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++ fs/btrfs/ioctl.h | 2 + fs/btrfs/transaction.c | 1 + 4 files changed, 72 insertions(+), 1 deletions(-) diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 994d255..039e11c 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -383,6 +383,7 @@ struct btrfs_header { */ #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048 #define BTRFS_LABEL_SIZE 256 +#define BTRFS_SUBVOL_LABEL_SIZE 32 /* * just in case we somehow lose the roots and are not able to mount, @@ -759,7 +760,8 @@ struct btrfs_root_item { struct btrfs_timespec otime; struct btrfs_timespec stime; struct btrfs_timespec rtime; - __le64 reserved[8]; /* for future */ + char label[BTRFS_SUBVOL_LABEL_SIZE]; + __le64 reserved[4]; /* for future */ } __attribute__ ((__packed__)); /* @@ -2441,6 +2443,14 @@ static inline bool btrfs_root_readonly(struct btrfs_root *root) { return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0; } +static inline char * btrfs_root_label(struct btrfs_root_item *root_item) +{ + return (root_item->label); +} +static inline void btrfs_root_set_label(struct btrfs_root_item *root_item, char *val) +{ + memcpy(root_item->label, val, BTRFS_SUBVOL_LABEL_SIZE); +} /* struct btrfs_root_backup */ BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup, diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index e58bd9d..abbac27 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -3725,6 +3725,60 @@ static int btrfs_ioctl_set_label(struct btrfs_root *root, void __user *arg) return 0; } +static int btrfs_ioctl_subvol_getlabel(struct btrfs_root *root, + void __user *arg) +{ + char *label; + + spin_lock(&root->root_times_lock); + label = btrfs_root_label(&root->root_item); + if (copy_to_user(arg, label, BTRFS_SUBVOL_LABEL_SIZE)) { + spin_unlock(&root->root_times_lock); + return -EFAULT; + } + spin_unlock(&root->root_times_lock); + return 0; +} + +static int btrfs_ioctl_subvol_setlabel(struct file *file, + void __user *arg) +{ + char label[BTRFS_SUBVOL_LABEL_SIZE+1]; + struct btrfs_trans_handle *trans; + struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; + struct inode *inode = file->f_path.dentry->d_inode; + int ret; + + if (btrfs_root_readonly(root)) + return -EROFS; + + if (!inode_owner_or_capable(inode)) + return -EACCES; + + ret = mnt_want_write_file(file); + if (ret) + return ret; + + if (copy_from_user(label, arg, BTRFS_SUBVOL_LABEL_SIZE)) { + ret = -EFAULT; + goto out; + } + + trans = btrfs_join_transaction(root); + if (IS_ERR(trans)) { + ret = PTR_ERR(trans); + goto out; + } + spin_lock(&root->root_times_lock); + btrfs_root_set_label(&root->root_item, label); + spin_unlock(&root->root_times_lock); + btrfs_end_transaction(trans, root); + +out: + mnt_drop_write_file(file); + return ret; +} + long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { @@ -3827,6 +3881,10 @@ long btrfs_ioctl(struct file *file, unsigned int return btrfs_ioctl_get_label(root, argp); case BTRFS_IOC_SET_LABEL: return btrfs_ioctl_set_label(root, argp); + case BTRFS_IOC_SUBVOL_GETLABEL: + return btrfs_ioctl_subvol_getlabel(root, argp); + case BTRFS_IOC_SUBVOL_SETLABEL: + return btrfs_ioctl_subvol_setlabel(file, argp); } return -ENOTTY; diff --git a/fs/btrfs/ioctl.h b/fs/btrfs/ioctl.h index 0c60fcb..1009a0c 100644 --- a/fs/btrfs/ioctl.h +++ b/fs/btrfs/ioctl.h @@ -455,4 +455,6 @@ struct btrfs_ioctl_send_args { struct btrfs_ioctl_get_dev_stats) #define BTRFS_IOC_GET_LABEL _IOR(BTRFS_IOCTL_MAGIC, 53, __u64) #define BTRFS_IOC_SET_LABEL _IOW(BTRFS_IOCTL_MAGIC, 54, __u64) +#define BTRFS_IOC_SUBVOL_GETLABEL _IOWR(BTRFS_IOCTL_MAGIC, 55, __u64) +#define BTRFS_IOC_SUBVOL_SETLABEL _IOW(BTRFS_IOCTL_MAGIC, 56, __u64) #endif diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c index 04bbfb1..0a3f8b3 100644 --- a/fs/btrfs/transaction.c +++ b/fs/btrfs/transaction.c @@ -1118,6 +1118,7 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans, memset(&new_root_item->rtime, 0, sizeof(new_root_item->rtime)); btrfs_set_root_stransid(new_root_item, 0); btrfs_set_root_rtransid(new_root_item, 0); + memset(&new_root_item->label, 0, BTRFS_SUBVOL_LABEL_SIZE); old = btrfs_lock_root_node(root); ret = btrfs_cow_block(trans, root, old, NULL, 0, &old); -- 1.7.1