diff options
Diffstat (limited to 'fs/ext4/ioctl.c')
| -rw-r--r-- | fs/ext4/ioctl.c | 509 |
1 files changed, 509 insertions, 0 deletions
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c new file mode 100644 index 00000000..1365903a --- /dev/null +++ b/fs/ext4/ioctl.c @@ -0,0 +1,509 @@ +/* + * linux/fs/ext4/ioctl.c + * + * Copyright (C) 1993, 1994, 1995 + * Remy Card (card@masi.ibp.fr) + * Laboratoire MASI - Institut Blaise Pascal + * Universite Pierre et Marie Curie (Paris VI) + */ + +#include <linux/fs.h> +#include <linux/jbd2.h> +#include <linux/capability.h> +#include <linux/time.h> +#include <linux/compat.h> +#include <linux/mount.h> +#include <linux/file.h> +#include <asm/uaccess.h> +#include "ext4_jbd2.h" +#include "ext4.h" + +#define MAX_32_NUM ((((unsigned long long) 1) << 32) - 1) + +long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) +{ + struct inode *inode = filp->f_dentry->d_inode; + struct super_block *sb = inode->i_sb; + struct ext4_inode_info *ei = EXT4_I(inode); + unsigned int flags; + + ext4_debug("cmd = %u, arg = %lu\n", cmd, arg); + + switch (cmd) { + case EXT4_IOC_GETFLAGS: + ext4_get_inode_flags(ei); + flags = ei->i_flags & EXT4_FL_USER_VISIBLE; + return put_user(flags, (int __user *) arg); + case EXT4_IOC_SETFLAGS: { + handle_t *handle = NULL; + int err, migrate = 0; + struct ext4_iloc iloc; + unsigned int oldflags, mask, i; + unsigned int jflag; + + if (!inode_owner_or_capable(inode)) + return -EACCES; + + if (get_user(flags, (int __user *) arg)) + return -EFAULT; + + err = mnt_want_write_file(filp); + if (err) + return err; + + flags = ext4_mask_flags(inode->i_mode, flags); + + err = -EPERM; + mutex_lock(&inode->i_mutex); + /* Is it quota file? Do not allow user to mess with it */ + if (IS_NOQUOTA(inode)) + goto flags_out; + + oldflags = ei->i_flags; + + /* The JOURNAL_DATA flag is modifiable only by root */ + jflag = flags & EXT4_JOURNAL_DATA_FL; + + /* + * The IMMUTABLE and APPEND_ONLY flags can only be changed by + * the relevant capability. + * + * This test looks nicer. Thanks to Pauline Middelink + */ + if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) { + if (!capable(CAP_LINUX_IMMUTABLE)) + goto flags_out; + } + + /* + * The JOURNAL_DATA flag can only be changed by + * the relevant capability. + */ + if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) { + if (!capable(CAP_SYS_RESOURCE)) + goto flags_out; + } + if (oldflags & EXT4_EXTENTS_FL) { + /* We don't support clearning extent flags */ + if (!(flags & EXT4_EXTENTS_FL)) { + err = -EOPNOTSUPP; + goto flags_out; + } + } else if (flags & EXT4_EXTENTS_FL) { + /* migrate the file */ + migrate = 1; + flags &= ~EXT4_EXTENTS_FL; + } + + if (flags & EXT4_EOFBLOCKS_FL) { + /* we don't support adding EOFBLOCKS flag */ + if (!(oldflags & EXT4_EOFBLOCKS_FL)) { + err = -EOPNOTSUPP; + goto flags_out; + } + } else if (oldflags & EXT4_EOFBLOCKS_FL) + ext4_truncate(inode); + + handle = ext4_journal_start(inode, 1); + if (IS_ERR(handle)) { + err = PTR_ERR(handle); + goto flags_out; + } + if (IS_SYNC(inode)) + ext4_handle_sync(handle); + err = ext4_reserve_inode_write(handle, inode, &iloc); + if (err) + goto flags_err; + + for (i = 0, mask = 1; i < 32; i++, mask <<= 1) { + if (!(mask & EXT4_FL_USER_MODIFIABLE)) + continue; + if (mask & flags) + ext4_set_inode_flag(inode, i); + else + ext4_clear_inode_flag(inode, i); + } + + ext4_set_inode_flags(inode); + inode->i_ctime = ext4_current_time(inode); + + err = ext4_mark_iloc_dirty(handle, inode, &iloc); +flags_err: + ext4_journal_stop(handle); + if (err) + goto flags_out; + + if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) + err = ext4_change_inode_journal_flag(inode, jflag); + if (err) + goto flags_out; + if (migrate) + err = ext4_ext_migrate(inode); +flags_out: + mutex_unlock(&inode->i_mutex); + mnt_drop_write_file(filp); + return err; + } + case EXT4_IOC_GETVERSION: + case EXT4_IOC_GETVERSION_OLD: + return put_user(inode->i_generation, (int __user *) arg); + case EXT4_IOC_SETVERSION: + case EXT4_IOC_SETVERSION_OLD: { + handle_t *handle; + struct ext4_iloc iloc; + __u32 generation; + int err; + + if (!inode_owner_or_capable(inode)) + return -EPERM; + + err = mnt_want_write_file(filp); + if (err) + return err; + if (get_user(generation, (int __user *) arg)) { + err = -EFAULT; + goto setversion_out; + } + + mutex_lock(&inode->i_mutex); + handle = ext4_journal_start(inode, 1); + if (IS_ERR(handle)) { + err = PTR_ERR(handle); + goto unlock_out; + } + err = ext4_reserve_inode_write(handle, inode, &iloc); + if (err == 0) { + inode->i_ctime = ext4_current_time(inode); + inode->i_generation = generation; + err = ext4_mark_iloc_dirty(handle, inode, &iloc); + } + ext4_journal_stop(handle); + +unlock_out: + mutex_unlock(&inode->i_mutex); +setversion_out: + mnt_drop_write_file(filp); + return err; + } + case EXT4_IOC_GROUP_EXTEND: { + ext4_fsblk_t n_blocks_count; + int err, err2=0; + + err = ext4_resize_begin(sb); + if (err) + return err; + + if (get_user(n_blocks_count, (__u32 __user *)arg)) { + err = -EFAULT; + goto group_extend_out; + } + + if (EXT4_HAS_RO_COMPAT_FEATURE(sb, + EXT4_FEATURE_RO_COMPAT_BIGALLOC)) { + ext4_msg(sb, KERN_ERR, + "Online resizing not supported with bigalloc"); + err = -EOPNOTSUPP; + goto group_extend_out; + } + + err = mnt_want_write_file(filp); + if (err) + goto group_extend_out; + + err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count); + if (EXT4_SB(sb)->s_journal) { + jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); + err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal); + jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); + } + if (err == 0) + err = err2; + mnt_drop_write_file(filp); +group_extend_out: + ext4_resize_end(sb); + return err; + } + + case EXT4_IOC_MOVE_EXT: { + struct move_extent me; + struct file *donor_filp; + int err; + + if (!(filp->f_mode & FMODE_READ) || + !(filp->f_mode & FMODE_WRITE)) + return -EBADF; + + if (copy_from_user(&me, + (struct move_extent __user *)arg, sizeof(me))) + return -EFAULT; + me.moved_len = 0; + + donor_filp = fget(me.donor_fd); + if (!donor_filp) + return -EBADF; + + if (!(donor_filp->f_mode & FMODE_WRITE)) { + err = -EBADF; + goto mext_out; + } + + if (EXT4_HAS_RO_COMPAT_FEATURE(sb, + EXT4_FEATURE_RO_COMPAT_BIGALLOC)) { + ext4_msg(sb, KERN_ERR, + "Online defrag not supported with bigalloc"); + return -EOPNOTSUPP; + } + + err = mnt_want_write_file(filp); + if (err) + goto mext_out; + + err = ext4_move_extents(filp, donor_filp, me.orig_start, + me.donor_start, me.len, &me.moved_len); + mnt_drop_write_file(filp); + mnt_drop_write(filp->f_path.mnt); + + if (copy_to_user((struct move_extent __user *)arg, + &me, sizeof(me))) + err = -EFAULT; +mext_out: + fput(donor_filp); + return err; + } + + case EXT4_IOC_GROUP_ADD: { + struct ext4_new_group_data input; + int err, err2=0; + + err = ext4_resize_begin(sb); + if (err) + return err; + + if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg, + sizeof(input))) { + err = -EFAULT; + goto group_add_out; + } + + if (EXT4_HAS_RO_COMPAT_FEATURE(sb, + EXT4_FEATURE_RO_COMPAT_BIGALLOC)) { + ext4_msg(sb, KERN_ERR, + "Online resizing not supported with bigalloc"); + err = -EOPNOTSUPP; + goto group_add_out; + } + + err = mnt_want_write_file(filp); + if (err) + goto group_add_out; + + err = ext4_group_add(sb, &input); + if (EXT4_SB(sb)->s_journal) { + jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); + err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal); + jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); + } + if (err == 0) + err = err2; + mnt_drop_write_file(filp); +group_add_out: + ext4_resize_end(sb); + return err; + } + + case EXT4_IOC_MIGRATE: + { + int err; + if (!inode_owner_or_capable(inode)) + return -EACCES; + + err = mnt_want_write_file(filp); + if (err) + return err; + /* + * inode_mutex prevent write and truncate on the file. + * Read still goes through. We take i_data_sem in + * ext4_ext_swap_inode_data before we switch the + * inode format to prevent read. + */ + mutex_lock(&(inode->i_mutex)); + err = ext4_ext_migrate(inode); + mutex_unlock(&(inode->i_mutex)); + mnt_drop_write_file(filp); + return err; + } + + case EXT4_IOC_ALLOC_DA_BLKS: + { + int err; + if (!inode_owner_or_capable(inode)) + return -EACCES; + + err = mnt_want_write_file(filp); + if (err) + return err; + err = ext4_alloc_da_blocks(inode); + mnt_drop_write_file(filp); + return err; + } + + case EXT4_IOC_RESIZE_FS: { + ext4_fsblk_t n_blocks_count; + struct super_block *sb = inode->i_sb; + int err = 0, err2 = 0; + + if (EXT4_HAS_RO_COMPAT_FEATURE(sb, + EXT4_FEATURE_RO_COMPAT_BIGALLOC)) { + ext4_msg(sb, KERN_ERR, + "Online resizing not (yet) supported with bigalloc"); + return -EOPNOTSUPP; + } + + if (EXT4_HAS_INCOMPAT_FEATURE(sb, + EXT4_FEATURE_INCOMPAT_META_BG)) { + ext4_msg(sb, KERN_ERR, + "Online resizing not (yet) supported with meta_bg"); + return -EOPNOTSUPP; + } + + if (copy_from_user(&n_blocks_count, (__u64 __user *)arg, + sizeof(__u64))) { + return -EFAULT; + } + + if (n_blocks_count > MAX_32_NUM && + !EXT4_HAS_INCOMPAT_FEATURE(sb, + EXT4_FEATURE_INCOMPAT_64BIT)) { + ext4_msg(sb, KERN_ERR, + "File system only supports 32-bit block numbers"); + return -EOPNOTSUPP; + } + + err = ext4_resize_begin(sb); + if (err) + return err; + + err = mnt_want_write(filp->f_path.mnt); + if (err) + goto resizefs_out; + + err = ext4_resize_fs(sb, n_blocks_count); + if (EXT4_SB(sb)->s_journal) { + jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); + err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal); + jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); + } + if (err == 0) + err = err2; + mnt_drop_write(filp->f_path.mnt); +resizefs_out: + ext4_resize_end(sb); + return err; + } + + case FITRIM: + { + struct request_queue *q = bdev_get_queue(sb->s_bdev); + struct fstrim_range range; + int ret = 0; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + if (!blk_queue_discard(q)) + return -EOPNOTSUPP; + + if (EXT4_HAS_RO_COMPAT_FEATURE(sb, + EXT4_FEATURE_RO_COMPAT_BIGALLOC)) { + ext4_msg(sb, KERN_ERR, + "FITRIM not supported with bigalloc"); + return -EOPNOTSUPP; + } + + if (copy_from_user(&range, (struct fstrim_range __user *)arg, + sizeof(range))) + return -EFAULT; + + range.minlen = max((unsigned int)range.minlen, + q->limits.discard_granularity); + ret = ext4_trim_fs(sb, &range); + if (ret < 0) + return ret; + + if (copy_to_user((struct fstrim_range __user *)arg, &range, + sizeof(range))) + return -EFAULT; + + return 0; + } + + default: + return -ENOTTY; + } +} + +#ifdef CONFIG_COMPAT +long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + /* These are just misnamed, they actually get/put from/to user an int */ + switch (cmd) { + case EXT4_IOC32_GETFLAGS: + cmd = EXT4_IOC_GETFLAGS; + break; + case EXT4_IOC32_SETFLAGS: + cmd = EXT4_IOC_SETFLAGS; + break; + case EXT4_IOC32_GETVERSION: + cmd = EXT4_IOC_GETVERSION; + break; + case EXT4_IOC32_SETVERSION: + cmd = EXT4_IOC_SETVERSION; + break; + case EXT4_IOC32_GROUP_EXTEND: + cmd = EXT4_IOC_GROUP_EXTEND; + break; + case EXT4_IOC32_GETVERSION_OLD: + cmd = EXT4_IOC_GETVERSION_OLD; + break; + case EXT4_IOC32_SETVERSION_OLD: + cmd = EXT4_IOC_SETVERSION_OLD; + break; + case EXT4_IOC32_GETRSVSZ: + cmd = EXT4_IOC_GETRSVSZ; + break; + case EXT4_IOC32_SETRSVSZ: + cmd = EXT4_IOC_SETRSVSZ; + break; + case EXT4_IOC32_GROUP_ADD: { + struct compat_ext4_new_group_input __user *uinput; + struct ext4_new_group_input input; + mm_segment_t old_fs; + int err; + + uinput = compat_ptr(arg); + err = get_user(input.group, &uinput->group); + err |= get_user(input.block_bitmap, &uinput->block_bitmap); + err |= get_user(input.inode_bitmap, &uinput->inode_bitmap); + err |= get_user(input.inode_table, &uinput->inode_table); + err |= get_user(input.blocks_count, &uinput->blocks_count); + err |= get_user(input.reserved_blocks, + &uinput->reserved_blocks); + if (err) + return -EFAULT; + old_fs = get_fs(); + set_fs(KERNEL_DS); + err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD, + (unsigned long) &input); + set_fs(old_fs); + return err; + } + case EXT4_IOC_MOVE_EXT: + case FITRIM: + case EXT4_IOC_RESIZE_FS: + break; + default: + return -ENOIOCTLCMD; + } + return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); +} +#endif |