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ext4: add EXT4_IOC_GOINGDOWN ioctl

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This ioctl is modeled after the xfs's XFS_IOC_GOINGDOWN ioctl.  (In
fact, it uses the same code points.)

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o 2017-02-05 19:47:14 -05:00
parent 0db1ff222d
commit 783d948544
3 changed files with 61 additions and 1 deletions
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10
fs/ext4/ext4.h
View File

@ -679,6 +679,16 @@ struct fsxattr {
#define EXT4_IOC_FSGETXATTR FS_IOC_FSGETXATTR
#define EXT4_IOC_FSSETXATTR FS_IOC_FSSETXATTR
#define EXT4_IOC_GOINGDOWN _IOR ('X', 125, __u32)
/*
* Flags for going down operation
*/
#define EXT4_GOING_FLAGS_DEFAULT 0x0 /* going down */
#define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */
#define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */
#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
/*
* ioctl commands in 32 bit emulation

50
fs/ext4/ioctl.c
View File

@ -16,6 +16,7 @@
#include <linux/quotaops.h>
#include <linux/uuid.h>
#include <linux/uaccess.h>
#include <linux/delay.h>
#include "ext4_jbd2.h"
#include "ext4.h"
@ -442,6 +443,52 @@ static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
return iflags;
}
int ext4_goingdown(struct super_block *sb, unsigned long arg)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
__u32 flags;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (get_user(flags, (__u32 __user *)arg))
return -EFAULT;
if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH)
return -EINVAL;
if (ext4_forced_shutdown(sbi))
return 0;
ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
switch (flags) {
case EXT4_GOING_FLAGS_DEFAULT:
freeze_bdev(sb->s_bdev);
set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
thaw_bdev(sb->s_bdev, sb);
break;
case EXT4_GOING_FLAGS_LOGFLUSH:
set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
(void) ext4_force_commit(sb);
jbd2_journal_abort(sbi->s_journal, 0);
}
break;
case EXT4_GOING_FLAGS_NOLOGFLUSH:
set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
msleep(100);
jbd2_journal_abort(sbi->s_journal, 0);
}
break;
default:
return -EINVAL;
}
clear_opt(sb, DISCARD);
return 0;
}
long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
struct inode *inode = file_inode(filp);
@ -893,6 +940,8 @@ resizefs_out:
return 0;
}
case EXT4_IOC_GOINGDOWN:
return ext4_goingdown(sb, arg);
default:
return -ENOTTY;
}
@ -959,6 +1008,7 @@ long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
case EXT4_IOC_SET_ENCRYPTION_POLICY:
case EXT4_IOC_GET_ENCRYPTION_PWSALT:
case EXT4_IOC_GET_ENCRYPTION_POLICY:
case EXT4_IOC_GOINGDOWN:
break;
default:
return -ENOIOCTLCMD;

2
fs/ext4/super.c
View File

@ -4821,7 +4821,7 @@ out:
*/
static int ext4_unfreeze(struct super_block *sb)
{
if (sb->s_flags & MS_RDONLY)
if ((sb->s_flags & MS_RDONLY) || ext4_forced_shutdown(EXT4_SB(sb)))
return 0;
if (EXT4_SB(sb)->s_journal) {