~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/fs/jfs/ioctl.c

Version: ~ [ linux-5.6-rc1 ] ~ [ linux-5.5.2 ] ~ [ linux-5.4.17 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.102 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.170 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.213 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.213 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.81 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * linux/fs/jfs/ioctl.c
  3  *
  4  * Copyright (C) 2006 Herbert Poetzl
  5  * adapted from Remy Card's ext2/ioctl.c
  6  */
  7 
  8 #include <linux/fs.h>
  9 #include <linux/ctype.h>
 10 #include <linux/capability.h>
 11 #include <linux/mount.h>
 12 #include <linux/time.h>
 13 #include <linux/sched.h>
 14 #include <linux/blkdev.h>
 15 #include <asm/current.h>
 16 #include <asm/uaccess.h>
 17 
 18 #include "jfs_filsys.h"
 19 #include "jfs_debug.h"
 20 #include "jfs_incore.h"
 21 #include "jfs_dinode.h"
 22 #include "jfs_inode.h"
 23 #include "jfs_dmap.h"
 24 #include "jfs_discard.h"
 25 
 26 static struct {
 27         long jfs_flag;
 28         long ext2_flag;
 29 } jfs_map[] = {
 30         {JFS_NOATIME_FL,        FS_NOATIME_FL},
 31         {JFS_DIRSYNC_FL,        FS_DIRSYNC_FL},
 32         {JFS_SYNC_FL,           FS_SYNC_FL},
 33         {JFS_SECRM_FL,          FS_SECRM_FL},
 34         {JFS_UNRM_FL,           FS_UNRM_FL},
 35         {JFS_APPEND_FL,         FS_APPEND_FL},
 36         {JFS_IMMUTABLE_FL,      FS_IMMUTABLE_FL},
 37         {0, 0},
 38 };
 39 
 40 static long jfs_map_ext2(unsigned long flags, int from)
 41 {
 42         int index=0;
 43         long mapped=0;
 44 
 45         while (jfs_map[index].jfs_flag) {
 46                 if (from) {
 47                         if (jfs_map[index].ext2_flag & flags)
 48                                 mapped |= jfs_map[index].jfs_flag;
 49                 } else {
 50                         if (jfs_map[index].jfs_flag & flags)
 51                                 mapped |= jfs_map[index].ext2_flag;
 52                 }
 53                 index++;
 54         }
 55         return mapped;
 56 }
 57 
 58 
 59 long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 60 {
 61         struct inode *inode = file_inode(filp);
 62         struct jfs_inode_info *jfs_inode = JFS_IP(inode);
 63         unsigned int flags;
 64 
 65         switch (cmd) {
 66         case JFS_IOC_GETFLAGS:
 67                 jfs_get_inode_flags(jfs_inode);
 68                 flags = jfs_inode->mode2 & JFS_FL_USER_VISIBLE;
 69                 flags = jfs_map_ext2(flags, 0);
 70                 return put_user(flags, (int __user *) arg);
 71         case JFS_IOC_SETFLAGS: {
 72                 unsigned int oldflags;
 73                 int err;
 74 
 75                 err = mnt_want_write_file(filp);
 76                 if (err)
 77                         return err;
 78 
 79                 if (!inode_owner_or_capable(inode)) {
 80                         err = -EACCES;
 81                         goto setflags_out;
 82                 }
 83                 if (get_user(flags, (int __user *) arg)) {
 84                         err = -EFAULT;
 85                         goto setflags_out;
 86                 }
 87 
 88                 flags = jfs_map_ext2(flags, 1);
 89                 if (!S_ISDIR(inode->i_mode))
 90                         flags &= ~JFS_DIRSYNC_FL;
 91 
 92                 /* Is it quota file? Do not allow user to mess with it */
 93                 if (IS_NOQUOTA(inode)) {
 94                         err = -EPERM;
 95                         goto setflags_out;
 96                 }
 97 
 98                 /* Lock against other parallel changes of flags */
 99                 mutex_lock(&inode->i_mutex);
100 
101                 jfs_get_inode_flags(jfs_inode);
102                 oldflags = jfs_inode->mode2;
103 
104                 /*
105                  * The IMMUTABLE and APPEND_ONLY flags can only be changed by
106                  * the relevant capability.
107                  */
108                 if ((oldflags & JFS_IMMUTABLE_FL) ||
109                         ((flags ^ oldflags) &
110                         (JFS_APPEND_FL | JFS_IMMUTABLE_FL))) {
111                         if (!capable(CAP_LINUX_IMMUTABLE)) {
112                                 mutex_unlock(&inode->i_mutex);
113                                 err = -EPERM;
114                                 goto setflags_out;
115                         }
116                 }
117 
118                 flags = flags & JFS_FL_USER_MODIFIABLE;
119                 flags |= oldflags & ~JFS_FL_USER_MODIFIABLE;
120                 jfs_inode->mode2 = flags;
121 
122                 jfs_set_inode_flags(inode);
123                 mutex_unlock(&inode->i_mutex);
124                 inode->i_ctime = CURRENT_TIME_SEC;
125                 mark_inode_dirty(inode);
126 setflags_out:
127                 mnt_drop_write_file(filp);
128                 return err;
129         }
130 
131         case FITRIM:
132         {
133                 struct super_block *sb = inode->i_sb;
134                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
135                 struct fstrim_range range;
136                 s64 ret = 0;
137 
138                 if (!capable(CAP_SYS_ADMIN))
139                         return -EPERM;
140 
141                 if (!blk_queue_discard(q)) {
142                         jfs_warn("FITRIM not supported on device");
143                         return -EOPNOTSUPP;
144                 }
145 
146                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
147                     sizeof(range)))
148                         return -EFAULT;
149 
150                 range.minlen = max_t(unsigned int, range.minlen,
151                         q->limits.discard_granularity);
152 
153                 ret = jfs_ioc_trim(inode, &range);
154                 if (ret < 0)
155                         return ret;
156 
157                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
158                     sizeof(range)))
159                         return -EFAULT;
160 
161                 return 0;
162         }
163 
164         default:
165                 return -ENOTTY;
166         }
167 }
168 
169 #ifdef CONFIG_COMPAT
170 long jfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
171 {
172         /* While these ioctl numbers defined with 'long' and have different
173          * numbers than the 64bit ABI,
174          * the actual implementation only deals with ints and is compatible.
175          */
176         switch (cmd) {
177         case JFS_IOC_GETFLAGS32:
178                 cmd = JFS_IOC_GETFLAGS;
179                 break;
180         case JFS_IOC_SETFLAGS32:
181                 cmd = JFS_IOC_SETFLAGS;
182                 break;
183         case FITRIM:
184                 cmd = FITRIM;
185                 break;
186         }
187         return jfs_ioctl(filp, cmd, arg);
188 }
189 #endif
190 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp