Exemplo n.º 1
0
/**
 * Look up and return the inode for a path name.
 * If nameiparent is true, return the inode for the parent and copy the final
 * path element into name, which must have room for DIRSIZ bytes.
 * Returns 0 in the case of error.
 */
static struct inode*
namex(char *path, bool nameiparent, char *name)
{
  struct inode *ip;
  struct inode *next;
  // If path is a full path, get the pointer to the root inode. Otherwise get
  // the inode corresponding to the current working directory.
  if(*path == '/'){
    ip = inode_get(ROOTDEV, ROOTINO);
  }
  else {
    ip = inode_dup((struct inode*) tcb_get_cwd(get_curid()));
  }

  while((path = skipelem(path, name)) != 0){
	inode_lock(ip);
	if(ip -> type != T_DIR) {
		return 0;
	}
	if(nameiparent && *path == 0) {
		inode_unlock(ip);
		return ip;
	}
	next = dir_lookup(ip, name, 0);
	inode_unlockput(ip);
	ip = next;
  }
  if(nameiparent){
    inode_put(ip);
    return 0;
  }
  return ip;
}
Exemplo n.º 2
0
static ssize_t f2fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
{
	struct file *file = iocb->ki_filp;
	struct inode *inode = file_inode(file);
	ssize_t ret;

	if (f2fs_encrypted_inode(inode) &&
				!fscrypt_has_encryption_key(inode) &&
				fscrypt_get_encryption_info(inode))
		return -EACCES;

	inode_lock(inode);
	ret = generic_write_checks(iocb, from);
	if (ret > 0) {
		ret = f2fs_preallocate_blocks(iocb, from);
		if (!ret)
			ret = __generic_file_write_iter(iocb, from);
	}
	inode_unlock(inode);

	if (ret > 0) {
		ssize_t err;

		err = generic_write_sync(file, iocb->ki_pos - ret, ret);
		if (err < 0)
			ret = err;
	}
	return ret;
}
Exemplo n.º 3
0
Arquivo: file.c Projeto: krzk/linux
static ssize_t orangefs_file_write_iter(struct kiocb *iocb, struct iov_iter *iter)
{
	struct file *file = iocb->ki_filp;
	loff_t pos;
	ssize_t rc;

	BUG_ON(iocb->private);

	gossip_debug(GOSSIP_FILE_DEBUG, "orangefs_file_write_iter\n");

	inode_lock(file->f_mapping->host);

	/* Make sure generic_write_checks sees an up to date inode size. */
	if (file->f_flags & O_APPEND) {
		rc = orangefs_inode_getattr(file->f_mapping->host, 0, 1,
		    STATX_SIZE);
		if (rc == -ESTALE)
			rc = -EIO;
		if (rc) {
			gossip_err("%s: orangefs_inode_getattr failed, "
			    "rc:%zd:.\n", __func__, rc);
			goto out;
		}
	}

	rc = generic_write_checks(iocb, iter);

	if (rc <= 0) {
		gossip_err("%s: generic_write_checks failed, rc:%zd:.\n",
			   __func__, rc);
		goto out;
	}

	/*
	 * if we are appending, generic_write_checks would have updated
	 * pos to the end of the file, so we will wait till now to set
	 * pos...
	 */
	pos = iocb->ki_pos;

	rc = do_readv_writev(ORANGEFS_IO_WRITE,
			     file,
			     &pos,
			     iter);
	if (rc < 0) {
		gossip_err("%s: do_readv_writev failed, rc:%zd:.\n",
			   __func__, rc);
		goto out;
	}

	iocb->ki_pos = pos;
	orangefs_stats.writes++;

out:

	inode_unlock(file->f_mapping->host);
	return rc;
}
Exemplo n.º 4
0
int ovl_setattr(struct dentry *dentry, struct iattr *attr)
{
	int err;
	struct dentry *upperdentry;

	/*
	 * Check for permissions before trying to copy-up.  This is redundant
	 * since it will be rechecked later by ->setattr() on upper dentry.  But
	 * without this, copy-up can be triggered by just about anybody.
	 *
	 * We don't initialize inode->size, which just means that
	 * inode_newsize_ok() will always check against MAX_LFS_FILESIZE and not
	 * check for a swapfile (which this won't be anyway).
	 */
	err = inode_change_ok(dentry->d_inode, attr);
	if (err)
		return err;

	err = ovl_want_write(dentry);
	if (err)
		goto out;

	if (attr->ia_valid & ATTR_SIZE) {
		struct inode *realinode = d_inode(ovl_dentry_real(dentry));

		err = -ETXTBSY;
		if (atomic_read(&realinode->i_writecount) < 0)
			goto out_drop_write;
	}

	err = ovl_copy_up(dentry);
	if (!err) {
		struct inode *winode = NULL;

		upperdentry = ovl_dentry_upper(dentry);

		if (attr->ia_valid & ATTR_SIZE) {
			winode = d_inode(upperdentry);
			err = get_write_access(winode);
			if (err)
				goto out_drop_write;
		}

		inode_lock(upperdentry->d_inode);
		err = notify_change(upperdentry, attr, NULL);
		if (!err)
			ovl_copyattr(upperdentry->d_inode, dentry->d_inode);
		inode_unlock(upperdentry->d_inode);

		if (winode)
			put_write_access(winode);
	}
out_drop_write:
	ovl_drop_write(dentry);
out:
	return err;
}
Exemplo n.º 5
0
/*
 * Locking primitives for read and write IO paths to ensure we consistently use
 * and order the inode->i_mutex, ip->i_lock and ip->i_iolock.
 */
static inline void
xfs_rw_ilock(
	struct xfs_inode	*ip,
	int			type)
{
	if (type & XFS_IOLOCK_EXCL)
		inode_lock(VFS_I(ip));
	xfs_ilock(ip, type);
}
Exemplo n.º 6
0
/* Removes any entry for NAME in DIR.
   Returns true if successful, false on failure,
   which occurs only if there is no file with the given NAME. */
bool
dir_remove (struct dir *dir, const char *name) 
{
  struct dir_entry e;
  struct inode *inode = NULL;
  bool success = false;
  off_t ofs;

  ASSERT (dir != NULL);
  ASSERT (name != NULL);

  //lock the directory for the rest of the lookup operation
  inode_lock(dir->inode);
  name = getfilename(name);

  /* Find directory entry. */
  if (!lookup (dir, name, &e, &ofs))
    goto done;

  /* Open inode. */
  inode = inode_open (e.inode_sector);
  if (inode == NULL)
    goto done;

  //if it is still open don't allow deletion
  if(inode_type(inode) == FILE_DIR) {
	//is file in use?
	if(inode_opencnt(inode) > 1)
		goto done;
	char * temp = (char *)malloc(sizeof(char) * (NAME_MAX + 1) );
	struct dir * dirtemp = dir_open(inode);
	//is dir empty?
	if (dir_readdir(dirtemp,temp)) {
		free(temp);
		dir_close(dirtemp);
		goto done;
	}
	free(temp);
	dir_close(dirtemp);	
  }

  /* Erase directory entry. */
  e.in_use = false;
  if (inode_write_at (dir->inode, &e, sizeof e, ofs) != sizeof e) 
    goto done;

  /* Remove inode. */
  inode_remove (inode);
  success = true;

 done:
  //unlock the directory
  inode_unlock(dir->inode);
  inode_close (inode);
  return success;
}
Exemplo n.º 7
0
static int fat_ioctl_get_attributes(struct inode *inode, u32 __user *user_attr)
{
	u32 attr;

	inode_lock(inode);
	attr = fat_make_attrs(inode);
	inode_unlock(inode);

	return put_user(attr, user_attr);
}
Exemplo n.º 8
0
Arquivo: ioctl.c Projeto: 020gzh/linux
int generic_block_fiemap(struct inode *inode,
			 struct fiemap_extent_info *fieinfo, u64 start,
			 u64 len, get_block_t *get_block)
{
	int ret;
	inode_lock(inode);
	ret = __generic_block_fiemap(inode, fieinfo, start, len, get_block);
	inode_unlock(inode);
	return ret;
}
Exemplo n.º 9
0
Arquivo: utimes.c Projeto: Lyude/linux
static int utimes_common(const struct path *path, struct timespec64 *times)
{
	int error;
	struct iattr newattrs;
	struct inode *inode = path->dentry->d_inode;
	struct inode *delegated_inode = NULL;

	error = mnt_want_write(path->mnt);
	if (error)
		goto out;

	if (times && times[0].tv_nsec == UTIME_NOW &&
		     times[1].tv_nsec == UTIME_NOW)
		times = NULL;

	newattrs.ia_valid = ATTR_CTIME | ATTR_MTIME | ATTR_ATIME;
	if (times) {
		if (times[0].tv_nsec == UTIME_OMIT)
			newattrs.ia_valid &= ~ATTR_ATIME;
		else if (times[0].tv_nsec != UTIME_NOW) {
			newattrs.ia_atime.tv_sec = times[0].tv_sec;
			newattrs.ia_atime.tv_nsec = times[0].tv_nsec;
			newattrs.ia_valid |= ATTR_ATIME_SET;
		}

		if (times[1].tv_nsec == UTIME_OMIT)
			newattrs.ia_valid &= ~ATTR_MTIME;
		else if (times[1].tv_nsec != UTIME_NOW) {
			newattrs.ia_mtime.tv_sec = times[1].tv_sec;
			newattrs.ia_mtime.tv_nsec = times[1].tv_nsec;
			newattrs.ia_valid |= ATTR_MTIME_SET;
		}
		/*
		 * Tell setattr_prepare(), that this is an explicit time
		 * update, even if neither ATTR_ATIME_SET nor ATTR_MTIME_SET
		 * were used.
		 */
		newattrs.ia_valid |= ATTR_TIMES_SET;
	} else {
		newattrs.ia_valid |= ATTR_TOUCH;
	}
retry_deleg:
	inode_lock(inode);
	error = notify_change(path->dentry, &newattrs, &delegated_inode);
	inode_unlock(inode);
	if (delegated_inode) {
		error = break_deleg_wait(&delegated_inode);
		if (!error)
			goto retry_deleg;
	}

	mnt_drop_write(path->mnt);
out:
	return error;
}
Exemplo n.º 10
0
/**
 * Get metadata about file f.
 */
int
file_stat(struct file *f, struct file_stat *st)
{
  if(f->type == FD_INODE){
    inode_lock(f->ip);
    inode_stat(f->ip, st);
    inode_unlock(f->ip);
    return 0;
  }
  return -1;
}
Exemplo n.º 11
0
static loff_t kernfs_dir_fop_llseek(struct file *file, loff_t offset,
				    int whence)
{
	struct inode *inode = file_inode(file);
	loff_t ret;

	inode_lock(inode);
	ret = generic_file_llseek(file, offset, whence);
	inode_unlock(inode);

	return ret;
}
Exemplo n.º 12
0
loff_t default_llseek(struct file *file, loff_t offset, int whence)
{
	struct inode *inode = file_inode(file);
	loff_t retval;

	inode_lock(inode);
	switch (whence) {
		case SEEK_END:
			offset += i_size_read(inode);
			break;
		case SEEK_CUR:
			if (offset == 0) {
				retval = file->f_pos;
				goto out;
			}
			offset += file->f_pos;
			break;
		case SEEK_DATA:
			/*
			 * In the generic case the entire file is data, so as
			 * long as offset isn't at the end of the file then the
			 * offset is data.
			 */
			if (offset >= inode->i_size) {
				retval = -ENXIO;
				goto out;
			}
			break;
		case SEEK_HOLE:
			/*
			 * There is a virtual hole at the end of the file, so
			 * as long as offset isn't i_size or larger, return
			 * i_size.
			 */
			if (offset >= inode->i_size) {
				retval = -ENXIO;
				goto out;
			}
			offset = inode->i_size;
			break;
	}
	retval = -EINVAL;
	if (offset >= 0 || unsigned_offsets(file)) {
		if (offset != file->f_pos) {
			file->f_pos = offset;
			file->f_version = 0;
		}
		retval = offset;
	}
out:
	inode_unlock(inode);
	return retval;
}
Exemplo n.º 13
0
static int mknod_ptmx(struct super_block *sb)
{
	int mode;
	int rc = -ENOMEM;
	struct dentry *dentry;
	struct inode *inode;
	struct dentry *root = sb->s_root;
	struct pts_fs_info *fsi = DEVPTS_SB(sb);
	struct pts_mount_opts *opts = &fsi->mount_opts;
	kuid_t ptmx_uid = current_fsuid();
	kgid_t ptmx_gid = current_fsgid();

	inode_lock(d_inode(root));

	/* If we have already created ptmx node, return */
	if (fsi->ptmx_dentry) {
		rc = 0;
		goto out;
	}

	dentry = d_alloc_name(root, "ptmx");
	if (!dentry) {
		pr_err("Unable to alloc dentry for ptmx node\n");
		goto out;
	}

	/*
	 * Create a new 'ptmx' node in this mount of devpts.
	 */
	inode = new_inode(sb);
	if (!inode) {
		pr_err("Unable to alloc inode for ptmx node\n");
		dput(dentry);
		goto out;
	}

	inode->i_ino = 2;
	inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);

	mode = S_IFCHR|opts->ptmxmode;
	init_special_inode(inode, mode, MKDEV(TTYAUX_MAJOR, 2));
	inode->i_uid = ptmx_uid;
	inode->i_gid = ptmx_gid;

	d_add(dentry, inode);

	fsi->ptmx_dentry = dentry;
	rc = 0;
out:
	inode_unlock(d_inode(root));
	return rc;
}
Exemplo n.º 14
0
/*******************************************************************************
 fs_iget: returns a locked previously allocated inode
*******************************************************************************/
struct inode * fs_iget(dev_nr_t dev_nr, inode_nr_t inode_nr)
{
    struct inode *ip;
    assert(dev_nr, "fs_iget(): dev_nr == 0");
repeat:
    if ( (ip = ihash_table_get_inode(dev_nr, inode_nr)) ) {
        if (inode_is_locked(ip)) {
            ;// sleep on  this inode
            goto repeat;
        }
        if (!inode_get_count(ip)) /* the inode is on the free list */
            ifree_list_remove_inode(ip);
        inode_lock(ip);
        inode_count_inc(ip);

        // especial processing for mount points ......
        // ...................
        return ip;

    }

    /* the inode was not in memory */
    if (ifree_list_is_empty())
        return NULL;
    ip = ifree_list_get_head();
    ifree_list_remove_inode(ip);
    if (inode_is_valid(ip)) /* the inode is on the hash table */
        ihash_table_remove_inode(ip);

    inode_set_dev_nr(ip, dev_nr);
    inode_set_nr(ip, inode_nr);
    ihash_table_insert_inode(ip);

    inode_lock(ip);
    inode_count_inc(ip);
    fs_iread(ip);

    return ip;
}
Exemplo n.º 15
0
/*
 * Reads from a regular file.
 */
PUBLIC ssize_t file_read(struct inode *i, void *buf, size_t n, off_t off)
{
	char *p;             /* Writing pointer.      */
	size_t blkoff;       /* Block offset.         */
	size_t chunk;        /* Data chunk size.      */
	block_t blk;         /* Working block number. */
	struct buffer *bbuf; /* Working block buffer. */
		
	p = buf;
	
	inode_lock(i);
	
	/* Read data. */
	do
	{
		blk = block_map(i, off, 0);
		
		/* End of file reached. */
		if (blk == BLOCK_NULL)
			goto out;
		
		bbuf = bread(i->dev, blk);
			
		blkoff = off % BLOCK_SIZE;
		
		/* Calculate read chunk size. */
		chunk = (n < BLOCK_SIZE - blkoff) ? n : BLOCK_SIZE - blkoff;
		if ((off_t)chunk > i->size - off)
		{
			chunk = i->size - off;
			if (chunk == 0)
			{
				brelse(bbuf);
				goto out;
			}
		}
		
		kmemcpy(p, (char *)bbuf->data + blkoff, chunk);
		brelse(bbuf);
		
		n -= chunk;
		off += chunk;
		p += chunk;
	} while (n > 0);

out:
	inode_touch(i);
	inode_unlock(i);
	return ((ssize_t)(p - (char *)buf));
}
Exemplo n.º 16
0
static ssize_t efivarfs_file_write(struct file *file,
		const char __user *userbuf, size_t count, loff_t *ppos)
{
	struct efivar_entry *var = file->private_data;
	void *data;
	u32 attributes;
	struct inode *inode = file->f_mapping->host;
	unsigned long datasize = count - sizeof(attributes);
	ssize_t bytes;
	bool set = false;

	if (count < sizeof(attributes))
		return -EINVAL;

	if (copy_from_user(&attributes, userbuf, sizeof(attributes)))
		return -EFAULT;

	if (attributes & ~(EFI_VARIABLE_MASK))
		return -EINVAL;

	data = memdup_user(userbuf + sizeof(attributes), datasize);
	if (IS_ERR(data))
		return PTR_ERR(data);

	bytes = efivar_entry_set_get_size(var, attributes, &datasize,
					  data, &set);
	if (!set && bytes) {
		if (bytes == -ENOENT)
			bytes = -EIO;
		goto out;
	}

	if (bytes == -ENOENT) {
		drop_nlink(inode);
		d_delete(file->f_path.dentry);
		dput(file->f_path.dentry);
	} else {
		inode_lock(inode);
		i_size_write(inode, datasize + sizeof(attributes));
		inode_unlock(inode);
	}

	bytes = count;

out:
	kfree(data);

	return bytes;
}
Exemplo n.º 17
0
/*
 * Writes to a regular file.
 */
PUBLIC ssize_t file_write(struct inode *i, const void *buf, size_t n, off_t off)
{
	const char *p;       /* Reading pointer.      */
	size_t blkoff;       /* Block offset.         */
	size_t chunk;        /* Data chunk size.      */
	block_t blk;         /* Working block number. */
	struct buffer *bbuf; /* Working block buffer. */
		
	p = buf;
	
	inode_lock(i);
	
	/* Write data. */
	do
	{
		blk = block_map(i, off, 1);
		
		/* End of file reached. */
		if (blk == BLOCK_NULL)
			goto out;
		
		bbuf = bread(i->dev, blk);
		
		blkoff = off % BLOCK_SIZE;
		
		chunk = (n < BLOCK_SIZE - blkoff) ? n : BLOCK_SIZE - blkoff;
		kmemcpy((char *)bbuf->data + blkoff, buf, chunk);
		bbuf->flags |= BUFFER_DIRTY;
		brelse(bbuf);
		
		n -= chunk;
		off += chunk;
		p += chunk;
		
		/* Update file size. */
		if (off > i->size)
		{
			i->size = off;
			i->flags |= INODE_DIRTY;
		}
		
	} while (n > 0);

out:

	inode_touch(i);
	inode_unlock(i);
	return ((ssize_t)(p - (char *)buf));
}
Exemplo n.º 18
0
/* exofs_file_fsync - flush the inode to disk
 *
 *   Note, in exofs all metadata is written as part of inode, regardless.
 *   The writeout is synchronous
 */
static int exofs_file_fsync(struct file *filp, loff_t start, loff_t end,
			    int datasync)
{
	struct inode *inode = filp->f_mapping->host;
	int ret;

	ret = file_write_and_wait_range(filp, start, end);
	if (ret)
		return ret;

	inode_lock(inode);
	ret = sync_inode_metadata(filp->f_mapping->host, 1);
	inode_unlock(inode);
	return ret;
}
Exemplo n.º 19
0
static int f2fs_ioc_setflags(struct file *filp, unsigned long arg)
{
	struct inode *inode = file_inode(filp);
	struct f2fs_inode_info *fi = F2FS_I(inode);
	unsigned int flags = fi->i_flags & FS_FL_USER_VISIBLE;
	unsigned int oldflags;
	int ret;

	ret = mnt_want_write_file(filp);
	if (ret)
		return ret;

	if (!inode_owner_or_capable(inode)) {
		ret = -EACCES;
		goto out;
	}

	if (get_user(flags, (int __user *)arg)) {
		ret = -EFAULT;
		goto out;
	}

	flags = f2fs_mask_flags(inode->i_mode, flags);

	inode_lock(inode);

	oldflags = fi->i_flags;

	if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
		if (!capable(CAP_LINUX_IMMUTABLE)) {
			inode_unlock(inode);
			ret = -EPERM;
			goto out;
		}
	}

	flags = flags & FS_FL_USER_MODIFIABLE;
	flags |= oldflags & ~FS_FL_USER_MODIFIABLE;
	fi->i_flags = flags;
	inode_unlock(inode);

	f2fs_set_inode_flags(inode);
	inode->i_ctime = CURRENT_TIME;
	mark_inode_dirty(inode);
out:
	mnt_drop_write_file(filp);
	return ret;
}
Exemplo n.º 20
0
/* Adds a file named NAME to DIR, which must not already contain a
   file by that name.  The file's inode is in sector
   INODE_SECTOR.
   Returns true if successful, false on failure.
   Fails if NAME is invalid (i.e. too long) or a disk or memory
   error occurs. */
bool
dir_add (struct dir *dir, const char *name, block_sector_t inode_sector)
{
  struct dir_entry e;
  off_t ofs;
  bool success = false;

  ASSERT (dir != NULL);
  ASSERT (name != NULL);
  inode_lock(dir_get_inode (dir));
  /* Check NAME for validity. */
  if (*name == '\0' || strlen (name) > NAME_MAX)
  {  
      inode_unlock (dir_get_inode(dir));
      return false;
  }

  /* Check that NAME is not in use. */
  if (lookup (dir, name, NULL, NULL))
    goto done;

  if (!inode_add_parent (inode_get_inumber (dir_get_inode(dir)),inode_sector))
  {
      goto done;
  }
  
  /* Set OFS to offset of free slot.
     If there are no free slots, then it will be set to the
     current end-of-file.
     
     inode_read_at() will only return a short read at end of file.
     Otherwise, we'd need to verify that we didn't get a short
     read due to something intermittent such as low memory. */
  for (ofs = 0; inode_read_at (dir->inode, &e, sizeof e, ofs) == sizeof e;
       ofs += sizeof e) 
    if (!e.in_use)
      break;

  /* Write slot. */
  e.in_use = true;
  strlcpy (e.name, name, sizeof e.name);
  e.inode_sector = inode_sector;
  success = inode_write_at (dir->inode, &e, sizeof e, ofs) == sizeof e;

 done:
  inode_unlock (dir_get_inode(dir));
  return success;
}
Exemplo n.º 21
0
static long f2fs_fallocate(struct file *file, int mode,
				loff_t offset, loff_t len)
{
	struct inode *inode = file_inode(file);
	long ret = 0;

	/* f2fs only support ->fallocate for regular file */
	if (!S_ISREG(inode->i_mode))
		return -EINVAL;

	if (f2fs_encrypted_inode(inode) &&
		(mode & (FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_INSERT_RANGE)))
		return -EOPNOTSUPP;

	if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |
			FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_ZERO_RANGE |
			FALLOC_FL_INSERT_RANGE))
		return -EOPNOTSUPP;

	inode_lock(inode);

	if (mode & FALLOC_FL_PUNCH_HOLE) {
		if (offset >= inode->i_size)
			goto out;

		ret = punch_hole(inode, offset, len);
	} else if (mode & FALLOC_FL_COLLAPSE_RANGE) {
		ret = f2fs_collapse_range(inode, offset, len);
	} else if (mode & FALLOC_FL_ZERO_RANGE) {
		ret = f2fs_zero_range(inode, offset, len, mode);
	} else if (mode & FALLOC_FL_INSERT_RANGE) {
		ret = f2fs_insert_range(inode, offset, len);
	} else {
		ret = expand_inode_data(inode, offset, len, mode);
	}

	if (!ret) {
		inode->i_mtime = inode->i_ctime = CURRENT_TIME;
		mark_inode_dirty(inode);
		f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
	}

out:
	inode_unlock(inode);

	trace_f2fs_fallocate(inode, mode, offset, len, ret);
	return ret;
}
Exemplo n.º 22
0
static int sel_open_policy(struct inode *inode, struct file *filp)
{
	struct policy_load_memory *plm = NULL;
	int rc;

	BUG_ON(filp->private_data);

	mutex_lock(&sel_mutex);

	rc = avc_has_perm(current_sid(), SECINITSID_SECURITY,
			  SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
	if (rc)
		goto err;

	rc = -EBUSY;
	if (policy_opened)
		goto err;

	rc = -ENOMEM;
	plm = kzalloc(sizeof(*plm), GFP_KERNEL);
	if (!plm)
		goto err;

	if (i_size_read(inode) != security_policydb_len()) {
		inode_lock(inode);
		i_size_write(inode, security_policydb_len());
		inode_unlock(inode);
	}

	rc = security_read_policy(&plm->data, &plm->len);
	if (rc)
		goto err;

	policy_opened = 1;

	filp->private_data = plm;

	mutex_unlock(&sel_mutex);

	return 0;
err:
	mutex_unlock(&sel_mutex);

	if (plm)
		vfree(plm->data);
	kfree(plm);
	return rc;
}
Exemplo n.º 23
0
static void hypfs_remove(struct dentry *dentry)
{
	struct dentry *parent;

	parent = dentry->d_parent;
	inode_lock(d_inode(parent));
	if (simple_positive(dentry)) {
		if (d_is_dir(dentry))
			simple_rmdir(d_inode(parent), dentry);
		else
			simple_unlink(d_inode(parent), dentry);
	}
	d_delete(dentry);
	dput(dentry);
	inode_unlock(d_inode(parent));
}
Exemplo n.º 24
0
/**
 * Read from file f.
 */
int
file_read(struct file *f, char *addr, int n)
{
  int r;

  if(f->readable == 0)
    return -1;
  if(f->type == FD_INODE){
    inode_lock(f->ip);
    if((r = inode_read(f->ip, addr, f->off, n)) > 0)
      f->off += r;
    inode_unlock(f->ip);
    return r;
  }
  KERN_PANIC("file_read");
}
Exemplo n.º 25
0
static int ocfs2_info_scan_inode_alloc(struct ocfs2_super *osb,
                                       struct inode *inode_alloc, u64 blkno,
                                       struct ocfs2_info_freeinode *fi,
                                       u32 slot)
{
    int status = 0, unlock = 0;

    struct buffer_head *bh = NULL;
    struct ocfs2_dinode *dinode_alloc = NULL;

    if (inode_alloc)
        inode_lock(inode_alloc);

    if (o2info_coherent(&fi->ifi_req)) {
        status = ocfs2_inode_lock(inode_alloc, &bh, 0);
        if (status < 0) {
            mlog_errno(status);
            goto bail;
        }
        unlock = 1;
    } else {
        status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
        if (status < 0) {
            mlog_errno(status);
            goto bail;
        }
    }

    dinode_alloc = (struct ocfs2_dinode *)bh->b_data;

    fi->ifi_stat[slot].lfi_total =
        le32_to_cpu(dinode_alloc->id1.bitmap1.i_total);
    fi->ifi_stat[slot].lfi_free =
        le32_to_cpu(dinode_alloc->id1.bitmap1.i_total) -
        le32_to_cpu(dinode_alloc->id1.bitmap1.i_used);

bail:
    if (unlock)
        ocfs2_inode_unlock(inode_alloc, 0);

    if (inode_alloc)
        inode_unlock(inode_alloc);

    brelse(bh);

    return status;
}
Exemplo n.º 26
0
int jffs2_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
{
	struct inode *inode = filp->f_mapping->host;
	struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
	int ret;

	ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
	if (ret)
		return ret;

	inode_lock(inode);
	/* Trigger GC to flush any pending writes for this inode */
	jffs2_flush_wbuf_gc(c, inode->i_ino);
	inode_unlock(inode);

	return 0;
}
Exemplo n.º 27
0
static int udf_release_file(struct inode *inode, struct file *filp)
{
	if (filp->f_mode & FMODE_WRITE &&
	    atomic_read(&inode->i_writecount) == 1) {
		/*
		 * Grab i_mutex to avoid races with writes changing i_size
		 * while we are running.
		 */
		inode_lock(inode);
		down_write(&UDF_I(inode)->i_data_sem);
		udf_discard_prealloc(inode);
		udf_truncate_tail_extent(inode);
		up_write(&UDF_I(inode)->i_data_sem);
		inode_unlock(inode);
	}
	return 0;
}
Exemplo n.º 28
0
static int create_file(const char *name, umode_t mode,
		       struct dentry *parent, struct dentry **dentry,
		       const struct file_operations *fops, void *data)
{
	int error;

	inode_lock(d_inode(parent));
	*dentry = lookup_one_len(name, parent, strlen(name));
	if (!IS_ERR(*dentry))
		error = ipathfs_mknod(d_inode(parent), *dentry,
				      mode, fops, data);
	else
		error = PTR_ERR(*dentry);
	inode_unlock(d_inode(parent));

	return error;
}
Exemplo n.º 29
0
static long fcntl_rw_hint(struct file *file, unsigned int cmd,
			  unsigned long arg)
{
	struct inode *inode = file_inode(file);
	u64 *argp = (u64 __user *)arg;
	enum rw_hint hint;
	u64 h;

	switch (cmd) {
	case F_GET_FILE_RW_HINT:
		h = file_write_hint(file);
		if (copy_to_user(argp, &h, sizeof(*argp)))
			return -EFAULT;
		return 0;
	case F_SET_FILE_RW_HINT:
		if (copy_from_user(&h, argp, sizeof(h)))
			return -EFAULT;
		hint = (enum rw_hint) h;
		if (!rw_hint_valid(hint))
			return -EINVAL;

		spin_lock(&file->f_lock);
		file->f_write_hint = hint;
		spin_unlock(&file->f_lock);
		return 0;
	case F_GET_RW_HINT:
		h = inode->i_write_hint;
		if (copy_to_user(argp, &h, sizeof(*argp)))
			return -EFAULT;
		return 0;
	case F_SET_RW_HINT:
		if (copy_from_user(&h, argp, sizeof(h)))
			return -EFAULT;
		hint = (enum rw_hint) h;
		if (!rw_hint_valid(hint))
			return -EINVAL;

		inode_lock(inode);
		inode->i_write_hint = hint;
		inode_unlock(inode);
		return 0;
	default:
		return -EINVAL;
	}
}
Exemplo n.º 30
0
static ssize_t udf_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
{
	ssize_t retval;
	struct file *file = iocb->ki_filp;
	struct inode *inode = file_inode(file);
	struct udf_inode_info *iinfo = UDF_I(inode);
	int err;

	inode_lock(inode);

	retval = generic_write_checks(iocb, from);
	if (retval <= 0)
		goto out;

	down_write(&iinfo->i_data_sem);
	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
		loff_t end = iocb->ki_pos + iov_iter_count(from);

		if (inode->i_sb->s_blocksize <
				(udf_file_entry_alloc_offset(inode) + end)) {
			err = udf_expand_file_adinicb(inode);
			if (err) {
				inode_unlock(inode);
				udf_debug("udf_expand_adinicb: err=%d\n", err);
				return err;
			}
		} else {
			iinfo->i_lenAlloc = max(end, inode->i_size);
			up_write(&iinfo->i_data_sem);
		}
	} else
		up_write(&iinfo->i_data_sem);

	retval = __generic_file_write_iter(iocb, from);
out:
	inode_unlock(inode);

	if (retval > 0) {
		mark_inode_dirty(inode);
		retval = generic_write_sync(iocb, retval);
	}

	return retval;
}