cregit-Linux how code gets into the kernel

Release 4.10 fs/ext2/ioctl.c

Directory: fs/ext2
 * linux/fs/ext2/ioctl.c
 * Copyright (C) 1993, 1994, 1995
 * Remy Card (
 * 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 <linux/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); inode_lock(inode); /* Is it quota file? Do not allow user to mess with it */ if (IS_NOQUOTA(inode)) { inode_unlock(inode); 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)) { inode_unlock(inode); 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(inode); inode_unlock(inode); 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; } inode_lock(inode); inode->i_ctime = current_time(inode); inode->i_generation = generation; inode_unlock(inode); 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; } }


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dave hansendave hansen8213.27%12.86%
djalal harounidjalal harouni294.69%12.86%
jan karajan kara213.40%25.71%
al viroal viro193.07%514.29%
andrew mortonandrew morton193.07%38.57%
linus torvaldslinus torvalds132.10%12.86%
andi kleenandi kleen81.29%12.86%
deepa dinamanideepa dinamani81.29%12.86%
duane griffinduane griffin50.81%12.86%
serge hallynserge hallyn30.49%12.86%
satyam sharmasatyam sharma20.32%12.86%
andreas dilgerandreas dilger10.16%12.86%

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)); }


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Overall Contributors

martin blighmartin bligh18425.31%12.33%
david howellsdavid howells8611.83%12.33%
dave hansendave hansen8511.69%12.33%
djalal harounidjalal harouni293.99%12.33%
jan karajan kara212.89%24.65%
andrew mortonandrew morton192.61%36.98%
al viroal viro192.61%511.63%
linus torvaldslinus torvalds152.06%24.65%
andi kleenandi kleen91.24%12.33%
deepa dinamanideepa dinamani81.10%12.33%
arnaldo carvalho de meloarnaldo carvalho de melo60.83%12.33%
duane griffinduane griffin50.69%12.33%
serge hallynserge hallyn30.41%12.33%
randy dunlaprandy dunlap30.41%12.33%
satyam sharmasatyam sharma20.28%12.33%
dave jonesdave jones10.14%12.33%
andreas dilgerandreas dilger10.14%12.33%
Directory: fs/ext2
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