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-rw-r--r--fs/ext3/ioctl.c327
1 files changed, 327 insertions, 0 deletions
diff --git a/fs/ext3/ioctl.c b/fs/ext3/ioctl.c
new file mode 100644
index 000000000..4d96e9a64
--- /dev/null
+++ b/fs/ext3/ioctl.c
@@ -0,0 +1,327 @@
+/*
+ * linux/fs/ext3/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/mount.h>
+#include <linux/compat.h>
+#include <asm/uaccess.h>
+#include "ext3.h"
+
+long ext3_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+ struct inode *inode = file_inode(filp);
+ struct ext3_inode_info *ei = EXT3_I(inode);
+ unsigned int flags;
+ unsigned short rsv_window_size;
+
+ ext3_debug ("cmd = %u, arg = %lu\n", cmd, arg);
+
+ switch (cmd) {
+ case EXT3_IOC_GETFLAGS:
+ ext3_get_inode_flags(ei);
+ flags = ei->i_flags & EXT3_FL_USER_VISIBLE;
+ return put_user(flags, (int __user *) arg);
+ case EXT3_IOC_SETFLAGS: {
+ handle_t *handle = NULL;
+ int err;
+ struct ext3_iloc iloc;
+ unsigned int oldflags;
+ 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 = ext3_mask_flags(inode->i_mode, flags);
+
+ mutex_lock(&inode->i_mutex);
+
+ /* Is it quota file? Do not allow user to mess with it */
+ err = -EPERM;
+ if (IS_NOQUOTA(inode))
+ goto flags_out;
+
+ oldflags = ei->i_flags;
+
+ /* The JOURNAL_DATA flag is modifiable only by root */
+ jflag = flags & EXT3_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) & (EXT3_APPEND_FL | EXT3_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) & (EXT3_JOURNAL_DATA_FL)) {
+ if (!capable(CAP_SYS_RESOURCE))
+ goto flags_out;
+ }
+
+ handle = ext3_journal_start(inode, 1);
+ if (IS_ERR(handle)) {
+ err = PTR_ERR(handle);
+ goto flags_out;
+ }
+ if (IS_SYNC(inode))
+ handle->h_sync = 1;
+ err = ext3_reserve_inode_write(handle, inode, &iloc);
+ if (err)
+ goto flags_err;
+
+ flags = flags & EXT3_FL_USER_MODIFIABLE;
+ flags |= oldflags & ~EXT3_FL_USER_MODIFIABLE;
+ ei->i_flags = flags;
+
+ ext3_set_inode_flags(inode);
+ inode->i_ctime = CURRENT_TIME_SEC;
+
+ err = ext3_mark_iloc_dirty(handle, inode, &iloc);
+flags_err:
+ ext3_journal_stop(handle);
+ if (err)
+ goto flags_out;
+
+ if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL))
+ err = ext3_change_inode_journal_flag(inode, jflag);
+flags_out:
+ mutex_unlock(&inode->i_mutex);
+ mnt_drop_write_file(filp);
+ return err;
+ }
+ case EXT3_IOC_GETVERSION:
+ case EXT3_IOC_GETVERSION_OLD:
+ return put_user(inode->i_generation, (int __user *) arg);
+ case EXT3_IOC_SETVERSION:
+ case EXT3_IOC_SETVERSION_OLD: {
+ handle_t *handle;
+ struct ext3_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 = ext3_journal_start(inode, 1);
+ if (IS_ERR(handle)) {
+ err = PTR_ERR(handle);
+ goto unlock_out;
+ }
+ err = ext3_reserve_inode_write(handle, inode, &iloc);
+ if (err == 0) {
+ inode->i_ctime = CURRENT_TIME_SEC;
+ inode->i_generation = generation;
+ err = ext3_mark_iloc_dirty(handle, inode, &iloc);
+ }
+ ext3_journal_stop(handle);
+
+unlock_out:
+ mutex_unlock(&inode->i_mutex);
+setversion_out:
+ mnt_drop_write_file(filp);
+ return err;
+ }
+ case EXT3_IOC_GETRSVSZ:
+ if (test_opt(inode->i_sb, RESERVATION)
+ && S_ISREG(inode->i_mode)
+ && ei->i_block_alloc_info) {
+ rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
+ return put_user(rsv_window_size, (int __user *)arg);
+ }
+ return -ENOTTY;
+ case EXT3_IOC_SETRSVSZ: {
+ int err;
+
+ if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
+ return -ENOTTY;
+
+ err = mnt_want_write_file(filp);
+ if (err)
+ return err;
+
+ if (!inode_owner_or_capable(inode)) {
+ err = -EACCES;
+ goto setrsvsz_out;
+ }
+
+ if (get_user(rsv_window_size, (int __user *)arg)) {
+ err = -EFAULT;
+ goto setrsvsz_out;
+ }
+
+ if (rsv_window_size > EXT3_MAX_RESERVE_BLOCKS)
+ rsv_window_size = EXT3_MAX_RESERVE_BLOCKS;
+
+ /*
+ * need to allocate reservation structure for this inode
+ * before set the window size
+ */
+ mutex_lock(&ei->truncate_mutex);
+ if (!ei->i_block_alloc_info)
+ ext3_init_block_alloc_info(inode);
+
+ if (ei->i_block_alloc_info){
+ struct ext3_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
+ rsv->rsv_goal_size = rsv_window_size;
+ }
+ mutex_unlock(&ei->truncate_mutex);
+setrsvsz_out:
+ mnt_drop_write_file(filp);
+ return err;
+ }
+ case EXT3_IOC_GROUP_EXTEND: {
+ ext3_fsblk_t n_blocks_count;
+ struct super_block *sb = inode->i_sb;
+ int err, err2;
+
+ if (!capable(CAP_SYS_RESOURCE))
+ return -EPERM;
+
+ err = mnt_want_write_file(filp);
+ if (err)
+ return err;
+
+ if (get_user(n_blocks_count, (__u32 __user *)arg)) {
+ err = -EFAULT;
+ goto group_extend_out;
+ }
+ err = ext3_group_extend(sb, EXT3_SB(sb)->s_es, n_blocks_count);
+ journal_lock_updates(EXT3_SB(sb)->s_journal);
+ err2 = journal_flush(EXT3_SB(sb)->s_journal);
+ journal_unlock_updates(EXT3_SB(sb)->s_journal);
+ if (err == 0)
+ err = err2;
+group_extend_out:
+ mnt_drop_write_file(filp);
+ return err;
+ }
+ case EXT3_IOC_GROUP_ADD: {
+ struct ext3_new_group_data input;
+ struct super_block *sb = inode->i_sb;
+ int err, err2;
+
+ if (!capable(CAP_SYS_RESOURCE))
+ return -EPERM;
+
+ err = mnt_want_write_file(filp);
+ if (err)
+ return err;
+
+ if (copy_from_user(&input, (struct ext3_new_group_input __user *)arg,
+ sizeof(input))) {
+ err = -EFAULT;
+ goto group_add_out;
+ }
+
+ err = ext3_group_add(sb, &input);
+ journal_lock_updates(EXT3_SB(sb)->s_journal);
+ err2 = journal_flush(EXT3_SB(sb)->s_journal);
+ journal_unlock_updates(EXT3_SB(sb)->s_journal);
+ if (err == 0)
+ err = err2;
+group_add_out:
+ mnt_drop_write_file(filp);
+ return err;
+ }
+ case FITRIM: {
+
+ struct super_block *sb = inode->i_sb;
+ struct fstrim_range range;
+ int ret = 0;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (copy_from_user(&range, (struct fstrim_range __user *)arg,
+ sizeof(range)))
+ return -EFAULT;
+
+ ret = ext3_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 ext3_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 EXT3_IOC32_GETFLAGS:
+ cmd = EXT3_IOC_GETFLAGS;
+ break;
+ case EXT3_IOC32_SETFLAGS:
+ cmd = EXT3_IOC_SETFLAGS;
+ break;
+ case EXT3_IOC32_GETVERSION:
+ cmd = EXT3_IOC_GETVERSION;
+ break;
+ case EXT3_IOC32_SETVERSION:
+ cmd = EXT3_IOC_SETVERSION;
+ break;
+ case EXT3_IOC32_GROUP_EXTEND:
+ cmd = EXT3_IOC_GROUP_EXTEND;
+ break;
+ case EXT3_IOC32_GETVERSION_OLD:
+ cmd = EXT3_IOC_GETVERSION_OLD;
+ break;
+ case EXT3_IOC32_SETVERSION_OLD:
+ cmd = EXT3_IOC_SETVERSION_OLD;
+ break;
+#ifdef CONFIG_JBD_DEBUG
+ case EXT3_IOC32_WAIT_FOR_READONLY:
+ cmd = EXT3_IOC_WAIT_FOR_READONLY;
+ break;
+#endif
+ case EXT3_IOC32_GETRSVSZ:
+ cmd = EXT3_IOC_GETRSVSZ;
+ break;
+ case EXT3_IOC32_SETRSVSZ:
+ cmd = EXT3_IOC_SETRSVSZ;
+ break;
+ case EXT3_IOC_GROUP_ADD:
+ break;
+ default:
+ return -ENOIOCTLCMD;
+ }
+ return ext3_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
+}
+#endif
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