fat: split fat_generic_ioctl
Christoph Hellwig [Mon, 8 Jun 2009 12:38:31 +0000 (21:38 +0900)]
Split up fat_generic_ioctl and add separate functions for the two
implemented ioctls.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>

fs/fat/file.c

index 6214287..9b94094 100644 (file)
 #include <linux/security.h>
 #include "fat.h"
 
-int fat_generic_ioctl(struct inode *inode, struct file *filp,
-                     unsigned int cmd, unsigned long arg)
+static int fat_ioctl_get_attributes(struct inode *inode, u32 __user *user_attr)
 {
+       u32 attr;
+
+       mutex_lock(&inode->i_mutex);
+       attr = fat_make_attrs(inode);
+       mutex_unlock(&inode->i_mutex);
+
+       return put_user(attr, user_attr);
+}
+
+static int fat_ioctl_set_attributes(struct file *file, u32 __user *user_attr)
+{
+       struct inode *inode = file->f_path.dentry->d_inode;
        struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
-       u32 __user *user_attr = (u32 __user *)arg;
+       int is_dir = S_ISDIR(inode->i_mode);
+       u32 attr, oldattr;
+       struct iattr ia;
+       int err;
 
-       switch (cmd) {
-       case FAT_IOCTL_GET_ATTRIBUTES:
-       {
-               u32 attr;
+       err = get_user(attr, user_attr);
+       if (err)
+               goto out;
 
-               mutex_lock(&inode->i_mutex);
-               attr = fat_make_attrs(inode);
-               mutex_unlock(&inode->i_mutex);
+       mutex_lock(&inode->i_mutex);
+       err = mnt_want_write(file->f_path.mnt);
+       if (err)
+               goto out_unlock_inode;
 
-               return put_user(attr, user_attr);
+       /*
+        * ATTR_VOLUME and ATTR_DIR cannot be changed; this also
+        * prevents the user from turning us into a VFAT
+        * longname entry.  Also, we obviously can't set
+        * any of the NTFS attributes in the high 24 bits.
+        */
+       attr &= 0xff & ~(ATTR_VOLUME | ATTR_DIR);
+       /* Merge in ATTR_VOLUME and ATTR_DIR */
+       attr |= (MSDOS_I(inode)->i_attrs & ATTR_VOLUME) |
+               (is_dir ? ATTR_DIR : 0);
+       oldattr = fat_make_attrs(inode);
+
+       /* Equivalent to a chmod() */
+       ia.ia_valid = ATTR_MODE | ATTR_CTIME;
+       ia.ia_ctime = current_fs_time(inode->i_sb);
+       if (is_dir)
+               ia.ia_mode = fat_make_mode(sbi, attr, S_IRWXUGO);
+       else {
+               ia.ia_mode = fat_make_mode(sbi, attr,
+                       S_IRUGO | S_IWUGO | (inode->i_mode & S_IXUGO));
        }
-       case FAT_IOCTL_SET_ATTRIBUTES:
-       {
-               u32 attr, oldattr;
-               int err, is_dir = S_ISDIR(inode->i_mode);
-               struct iattr ia;
 
-               err = get_user(attr, user_attr);
-               if (err)
-                       return err;
+       /* The root directory has no attributes */
+       if (inode->i_ino == MSDOS_ROOT_INO && attr != ATTR_DIR) {
+               err = -EINVAL;
+               goto out_drop_write;
+       }
 
-               mutex_lock(&inode->i_mutex);
-
-               err = mnt_want_write(filp->f_path.mnt);
-               if (err)
-                       goto up_no_drop_write;
-
-               /*
-                * ATTR_VOLUME and ATTR_DIR cannot be changed; this also
-                * prevents the user from turning us into a VFAT
-                * longname entry.  Also, we obviously can't set
-                * any of the NTFS attributes in the high 24 bits.
-                */
-               attr &= 0xff & ~(ATTR_VOLUME | ATTR_DIR);
-               /* Merge in ATTR_VOLUME and ATTR_DIR */
-               attr |= (MSDOS_I(inode)->i_attrs & ATTR_VOLUME) |
-                       (is_dir ? ATTR_DIR : 0);
-               oldattr = fat_make_attrs(inode);
-
-               /* Equivalent to a chmod() */
-               ia.ia_valid = ATTR_MODE | ATTR_CTIME;
-               ia.ia_ctime = current_fs_time(inode->i_sb);
-               if (is_dir)
-                       ia.ia_mode = fat_make_mode(sbi, attr, S_IRWXUGO);
-               else {
-                       ia.ia_mode = fat_make_mode(sbi, attr,
-                               S_IRUGO | S_IWUGO | (inode->i_mode & S_IXUGO));
-               }
+       if (sbi->options.sys_immutable &&
+           ((attr | oldattr) & ATTR_SYS) &&
+           !capable(CAP_LINUX_IMMUTABLE)) {
+               err = -EPERM;
+               goto out_drop_write;
+       }
 
-               /* The root directory has no attributes */
-               if (inode->i_ino == MSDOS_ROOT_INO && attr != ATTR_DIR) {
-                       err = -EINVAL;
-                       goto up;
-               }
+       /*
+        * The security check is questionable...  We single
+        * out the RO attribute for checking by the security
+        * module, just because it maps to a file mode.
+        */
+       err = security_inode_setattr(file->f_path.dentry, &ia);
+       if (err)
+               goto out_drop_write;
 
-               if (sbi->options.sys_immutable) {
-                       if ((attr | oldattr) & ATTR_SYS) {
-                               if (!capable(CAP_LINUX_IMMUTABLE)) {
-                                       err = -EPERM;
-                                       goto up;
-                               }
-                       }
-               }
+       /* This MUST be done before doing anything irreversible... */
+       err = fat_setattr(file->f_path.dentry, &ia);
+       if (err)
+               goto out_drop_write;
+
+       fsnotify_change(file->f_path.dentry, ia.ia_valid);
+       if (sbi->options.sys_immutable) {
+               if (attr & ATTR_SYS)
+                       inode->i_flags |= S_IMMUTABLE;
+               else
+                       inode->i_flags &= S_IMMUTABLE;
+       }
 
-               /*
-                * The security check is questionable...  We single
-                * out the RO attribute for checking by the security
-                * module, just because it maps to a file mode.
-                */
-               err = security_inode_setattr(filp->f_path.dentry, &ia);
-               if (err)
-                       goto up;
-
-               /* This MUST be done before doing anything irreversible... */
-               err = fat_setattr(filp->f_path.dentry, &ia);
-               if (err)
-                       goto up;
-
-               fsnotify_change(filp->f_path.dentry, ia.ia_valid);
-               if (sbi->options.sys_immutable) {
-                       if (attr & ATTR_SYS)
-                               inode->i_flags |= S_IMMUTABLE;
-                       else
-                               inode->i_flags &= S_IMMUTABLE;
-               }
+       fat_save_attrs(inode, attr);
+       mark_inode_dirty(inode);
+out_drop_write:
+       mnt_drop_write(file->f_path.mnt);
+out_unlock_inode:
+       mutex_unlock(&inode->i_mutex);
+out:
+       return err;
+}
 
-               fat_save_attrs(inode, attr);
-               mark_inode_dirty(inode);
-up:
-               mnt_drop_write(filp->f_path.mnt);
-up_no_drop_write:
-               mutex_unlock(&inode->i_mutex);
-               return err;
-       }
+int fat_generic_ioctl(struct inode *inode, struct file *filp,
+                     unsigned int cmd, unsigned long arg)
+{
+       u32 __user *user_attr = (u32 __user *)arg;
+
+       switch (cmd) {
+       case FAT_IOCTL_GET_ATTRIBUTES:
+               return fat_ioctl_get_attributes(inode, user_attr);
+       case FAT_IOCTL_SET_ATTRIBUTES:
+               return fat_ioctl_set_attributes(filp, user_attr);
        default:
                return -ENOTTY; /* Inappropriate ioctl for device */
        }