diff options
Diffstat (limited to 'fs/ext4/ioctl.c')
| -rw-r--r-- | fs/ext4/ioctl.c | 315 |
1 files changed, 315 insertions, 0 deletions
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c new file mode 100644 index 0000000..dc99b47 --- /dev/null +++ b/fs/ext4/ioctl.c @@ -0,0 +1,315 @@ +/* + * 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/smp_lock.h> +#include <linux/mount.h> +#include <asm/uaccess.h> +#include "ext4_jbd2.h" +#include "ext4.h" + +long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) +{ + struct inode *inode = filp->f_dentry->d_inode; + 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; + unsigned int jflag; + + if (!is_owner_or_cap(inode)) + return -EACCES; + + if (get_user(flags, (int __user *) arg)) + return -EFAULT; + + err = mnt_want_write(filp->f_path.mnt); + if (err) + return err; + + if (!S_ISDIR(inode->i_mode)) + flags &= ~EXT4_DIRSYNC_FL; + + 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; + } + + handle = ext4_journal_start(inode, 1); + if (IS_ERR(handle)) { + err = PTR_ERR(handle); + goto flags_out; + } + if (IS_SYNC(inode)) + handle->h_sync = 1; + err = ext4_reserve_inode_write(handle, inode, &iloc); + if (err) + goto flags_err; + + flags = flags & EXT4_FL_USER_MODIFIABLE; + flags |= oldflags & ~EXT4_FL_USER_MODIFIABLE; + ei->i_flags = flags; + + 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(filp->f_path.mnt); + 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 (!is_owner_or_cap(inode)) + return -EPERM; + + err = mnt_want_write(filp->f_path.mnt); + if (err) + return err; + if (get_user(generation, (int __user *) arg)) { + err = -EFAULT; + goto setversion_out; + } + + handle = ext4_journal_start(inode, 1); + if (IS_ERR(handle)) { + err = PTR_ERR(handle); + goto setversion_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); +setversion_out: + mnt_drop_write(filp->f_path.mnt); + return err; + } +#ifdef CONFIG_JBD2_DEBUG + case EXT4_IOC_WAIT_FOR_READONLY: + /* + * This is racy - by the time we're woken up and running, + * the superblock could be released. And the module could + * have been unloaded. So sue me. + * + * Returns 1 if it slept, else zero. + */ + { + struct super_block *sb = inode->i_sb; + DECLARE_WAITQUEUE(wait, current); + int ret = 0; + + set_current_state(TASK_INTERRUPTIBLE); + add_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait); + if (timer_pending(&EXT4_SB(sb)->turn_ro_timer)) { + schedule(); + ret = 1; + } + remove_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait); + return ret; + } +#endif + case EXT4_IOC_GROUP_EXTEND: { + ext4_fsblk_t n_blocks_count; + struct super_block *sb = inode->i_sb; + int err, err2; + + if (!capable(CAP_SYS_RESOURCE)) + return -EPERM; + + if (get_user(n_blocks_count, (__u32 __user *)arg)) + return -EFAULT; + + err = mnt_want_write(filp->f_path.mnt); + if (err) + return err; + + err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count); + 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); + + return err; + } + case EXT4_IOC_GROUP_ADD: { + struct ext4_new_group_data input; + struct super_block *sb = inode->i_sb; + int err, err2; + + if (!capable(CAP_SYS_RESOURCE)) + return -EPERM; + + if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg, + sizeof(input))) + return -EFAULT; + + err = mnt_want_write(filp->f_path.mnt); + if (err) + return err; + + err = ext4_group_add(sb, &input); + 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); + + return err; + } + + case EXT4_IOC_MIGRATE: + { + int err; + if (!is_owner_or_cap(inode)) + return -EACCES; + + err = mnt_want_write(filp->f_path.mnt); + 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(filp->f_path.mnt); + return err; + } + + 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; +#ifdef CONFIG_JBD2_DEBUG + case EXT4_IOC32_WAIT_FOR_READONLY: + cmd = EXT4_IOC_WAIT_FOR_READONLY; + break; +#endif + case EXT4_IOC32_GETRSVSZ: + cmd = EXT4_IOC_GETRSVSZ; + break; + case EXT4_IOC32_SETRSVSZ: + cmd = EXT4_IOC_SETRSVSZ; + break; + case EXT4_IOC_GROUP_ADD: + break; + default: + return -ENOIOCTLCMD; + } + return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); +} +#endif |
