cregit-Linux how code gets into the kernel

Release 4.10 fs/jfs/ioctl.c

Directory: fs/jfs
 * linux/fs/jfs/ioctl.c
 * Copyright (C) 2006 Herbert Poetzl
 * adapted from Remy Card's ext2/ioctl.c

#include <linux/fs.h>
#include <linux/ctype.h>
#include <linux/capability.h>
#include <linux/mount.h>
#include <linux/time.h>
#include <linux/sched.h>
#include <linux/blkdev.h>
#include <asm/current.h>
#include <linux/uaccess.h>

#include "jfs_filsys.h"
#include "jfs_debug.h"
#include "jfs_incore.h"
#include "jfs_dinode.h"
#include "jfs_inode.h"
#include "jfs_dmap.h"
#include "jfs_discard.h"

static struct {
long jfs_flag;
long ext2_flag;
jfs_map[] = {
	{0, 0},

static long jfs_map_ext2(unsigned long flags, int from) { int index=0; long mapped=0; while (jfs_map[index].jfs_flag) { if (from) { if (jfs_map[index].ext2_flag & flags) mapped |= jfs_map[index].jfs_flag; } else { if (jfs_map[index].jfs_flag & flags) mapped |= jfs_map[index].ext2_flag; } index++; } return mapped; }


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long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { struct inode *inode = file_inode(filp); struct jfs_inode_info *jfs_inode = JFS_IP(inode); unsigned int flags; switch (cmd) { case JFS_IOC_GETFLAGS: jfs_get_inode_flags(jfs_inode); flags = jfs_inode->mode2 & JFS_FL_USER_VISIBLE; flags = jfs_map_ext2(flags, 0); return put_user(flags, (int __user *) arg); case JFS_IOC_SETFLAGS: { unsigned int oldflags; int err; err = mnt_want_write_file(filp); if (err) return err; if (!inode_owner_or_capable(inode)) { err = -EACCES; goto setflags_out; } if (get_user(flags, (int __user *) arg)) { err = -EFAULT; goto setflags_out; } flags = jfs_map_ext2(flags, 1); if (!S_ISDIR(inode->i_mode)) flags &= ~JFS_DIRSYNC_FL; /* Is it quota file? Do not allow user to mess with it */ if (IS_NOQUOTA(inode)) { err = -EPERM; goto setflags_out; } /* Lock against other parallel changes of flags */ inode_lock(inode); jfs_get_inode_flags(jfs_inode); oldflags = jfs_inode->mode2; /* * The IMMUTABLE and APPEND_ONLY flags can only be changed by * the relevant capability. */ if ((oldflags & JFS_IMMUTABLE_FL) || ((flags ^ oldflags) & (JFS_APPEND_FL | JFS_IMMUTABLE_FL))) { if (!capable(CAP_LINUX_IMMUTABLE)) { inode_unlock(inode); err = -EPERM; goto setflags_out; } } flags = flags & JFS_FL_USER_MODIFIABLE; flags |= oldflags & ~JFS_FL_USER_MODIFIABLE; jfs_inode->mode2 = flags; jfs_set_inode_flags(inode); inode_unlock(inode); inode->i_ctime = current_time(inode); mark_inode_dirty(inode); setflags_out: mnt_drop_write_file(filp); return err; } case FITRIM: { struct super_block *sb = inode->i_sb; struct request_queue *q = bdev_get_queue(sb->s_bdev); struct fstrim_range range; s64 ret = 0; if (!capable(CAP_SYS_ADMIN)) return -EPERM; if (!blk_queue_discard(q)) { jfs_warn("FITRIM not supported on device"); return -EOPNOTSUPP; } if (copy_from_user(&range, (struct fstrim_range __user *)arg, sizeof(range))) return -EFAULT; range.minlen = max_t(unsigned int, range.minlen, q->limits.discard_granularity); ret = jfs_ioc_trim(inode, &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; } }


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long jfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { /* While these ioctl numbers defined with 'long' and have different * numbers than the 64bit ABI, * the actual implementation only deals with ints and is compatible. */ switch (cmd) { case JFS_IOC_GETFLAGS32: cmd = JFS_IOC_GETFLAGS; break; case JFS_IOC_SETFLAGS32: cmd = JFS_IOC_SETFLAGS; break; } return jfs_ioctl(filp, cmd, arg); }


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tino reichardttino reichardt16622.83%15.88%
andi kleenandi kleen7910.87%211.76%
dave hansendave hansen517.02%15.88%
al viroal viro111.51%529.41%
dave kleikampdave kleikamp101.38%15.88%
jan karajan kara101.38%15.88%
david howellsdavid howells70.96%15.88%
deepa dinamanideepa dinamani40.55%15.88%
linus torvaldslinus torvalds10.14%15.88%
serge hallynserge hallyn10.14%15.88%
satyam sharmasatyam sharma10.14%15.88%
Directory: fs/jfs
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