diff options
author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
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committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
commit | 57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch) | |
tree | 5e910f0e82173f4ef4f51111366a3f1299037a7b /fs/ext2/ioctl.c |
Initial import
Diffstat (limited to 'fs/ext2/ioctl.c')
-rw-r--r-- | fs/ext2/ioctl.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/fs/ext2/ioctl.c b/fs/ext2/ioctl.c new file mode 100644 index 000000000..5d46c0986 --- /dev/null +++ b/fs/ext2/ioctl.c @@ -0,0 +1,188 @@ +/* + * linux/fs/ext2/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 "ext2.h" +#include <linux/capability.h> +#include <linux/time.h> +#include <linux/sched.h> +#include <linux/compat.h> +#include <linux/mount.h> +#include <asm/current.h> +#include <asm/uaccess.h> + + +long ext2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) +{ + struct inode *inode = file_inode(filp); + struct ext2_inode_info *ei = EXT2_I(inode); + unsigned int flags; + unsigned short rsv_window_size; + int ret; + + ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg); + + switch (cmd) { + case EXT2_IOC_GETFLAGS: + ext2_get_inode_flags(ei); + flags = ei->i_flags & EXT2_FL_USER_VISIBLE; + return put_user(flags, (int __user *) arg); + case EXT2_IOC_SETFLAGS: { + unsigned int oldflags; + + ret = mnt_want_write_file(filp); + if (ret) + return ret; + + if (!inode_owner_or_capable(inode)) { + ret = -EACCES; + goto setflags_out; + } + + if (get_user(flags, (int __user *) arg)) { + ret = -EFAULT; + goto setflags_out; + } + + flags = ext2_mask_flags(inode->i_mode, flags); + + mutex_lock(&inode->i_mutex); + /* Is it quota file? Do not allow user to mess with it */ + if (IS_NOQUOTA(inode)) { + mutex_unlock(&inode->i_mutex); + ret = -EPERM; + goto setflags_out; + } + oldflags = ei->i_flags; + + /* + * 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) & (EXT2_APPEND_FL | EXT2_IMMUTABLE_FL)) { + if (!capable(CAP_LINUX_IMMUTABLE)) { + mutex_unlock(&inode->i_mutex); + ret = -EPERM; + goto setflags_out; + } + } + + flags = flags & EXT2_FL_USER_MODIFIABLE; + flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE; + ei->i_flags = flags; + + ext2_set_inode_flags(inode); + inode->i_ctime = CURRENT_TIME_SEC; + mutex_unlock(&inode->i_mutex); + + mark_inode_dirty(inode); +setflags_out: + mnt_drop_write_file(filp); + return ret; + } + case EXT2_IOC_GETVERSION: + return put_user(inode->i_generation, (int __user *) arg); + case EXT2_IOC_SETVERSION: { + __u32 generation; + + if (!inode_owner_or_capable(inode)) + return -EPERM; + ret = mnt_want_write_file(filp); + if (ret) + return ret; + if (get_user(generation, (int __user *) arg)) { + ret = -EFAULT; + goto setversion_out; + } + + mutex_lock(&inode->i_mutex); + inode->i_ctime = CURRENT_TIME_SEC; + inode->i_generation = generation; + mutex_unlock(&inode->i_mutex); + + mark_inode_dirty(inode); +setversion_out: + mnt_drop_write_file(filp); + return ret; + } + case EXT2_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 EXT2_IOC_SETRSVSZ: { + + if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode)) + return -ENOTTY; + + if (!inode_owner_or_capable(inode)) + return -EACCES; + + if (get_user(rsv_window_size, (int __user *)arg)) + return -EFAULT; + + ret = mnt_want_write_file(filp); + if (ret) + return ret; + + if (rsv_window_size > EXT2_MAX_RESERVE_BLOCKS) + rsv_window_size = EXT2_MAX_RESERVE_BLOCKS; + + /* + * need to allocate reservation structure for this inode + * before set the window size + */ + /* + * XXX What lock should protect the rsv_goal_size? + * Accessed in ext2_get_block only. ext3 uses i_truncate. + */ + mutex_lock(&ei->truncate_mutex); + if (!ei->i_block_alloc_info) + ext2_init_block_alloc_info(inode); + + if (ei->i_block_alloc_info){ + struct ext2_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node; + rsv->rsv_goal_size = rsv_window_size; + } + mutex_unlock(&ei->truncate_mutex); + mnt_drop_write_file(filp); + return 0; + } + default: + return -ENOTTY; + } +} + +#ifdef CONFIG_COMPAT +long ext2_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 EXT2_IOC32_GETFLAGS: + cmd = EXT2_IOC_GETFLAGS; + break; + case EXT2_IOC32_SETFLAGS: + cmd = EXT2_IOC_SETFLAGS; + break; + case EXT2_IOC32_GETVERSION: + cmd = EXT2_IOC_GETVERSION; + break; + case EXT2_IOC32_SETVERSION: + cmd = EXT2_IOC_SETVERSION; + break; + default: + return -ENOIOCTLCMD; + } + return ext2_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); +} +#endif |