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author | Theodore Ts'o <tytso@mit.edu> | 2017-02-05 19:47:14 -0500 |
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committer | Theodore Ts'o <tytso@mit.edu> | 2017-02-05 19:47:14 -0500 |
commit | 783d948544993f55bdacc78b127532e8b6e2fc9f (patch) | |
tree | 9aa172542294f1d75dc033d10f8756c5832ee1e8 /fs/ext4/ioctl.c | |
parent | 0db1ff222d40f1601c961f0edb86d10426992595 (diff) | |
download | op-kernel-dev-783d948544993f55bdacc78b127532e8b6e2fc9f.zip op-kernel-dev-783d948544993f55bdacc78b127532e8b6e2fc9f.tar.gz |
ext4: add EXT4_IOC_GOINGDOWN ioctl
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>
Diffstat (limited to 'fs/ext4/ioctl.c')
-rw-r--r-- | fs/ext4/ioctl.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c index d534399..b383ebf 100644 --- a/fs/ext4/ioctl.c +++ b/fs/ext4/ioctl.c @@ -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; |