Exemplo n.º 1
0
int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
{
	int status = 0, size_change;
	struct inode *inode = dentry->d_inode;
	struct super_block *sb = inode->i_sb;
	struct ocfs2_super *osb = OCFS2_SB(sb);
	struct buffer_head *bh = NULL;
	handle_t *handle = NULL;

	mlog_entry("(0x%p, '%.*s')\n", dentry,
	           dentry->d_name.len, dentry->d_name.name);

	if (attr->ia_valid & ATTR_MODE)
		mlog(0, "mode change: %d\n", attr->ia_mode);
	if (attr->ia_valid & ATTR_UID)
		mlog(0, "uid change: %d\n", attr->ia_uid);
	if (attr->ia_valid & ATTR_GID)
		mlog(0, "gid change: %d\n", attr->ia_gid);
	if (attr->ia_valid & ATTR_SIZE)
		mlog(0, "size change...\n");
	if (attr->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME))
		mlog(0, "time change...\n");

#define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \
			   | ATTR_GID | ATTR_UID | ATTR_MODE)
	if (!(attr->ia_valid & OCFS2_VALID_ATTRS)) {
		mlog(0, "can't handle attrs: 0x%x\n", attr->ia_valid);
		return 0;
	}

	status = inode_change_ok(inode, attr);
	if (status)
		return status;

	size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE;
	if (size_change) {
		status = ocfs2_rw_lock(inode, 1);
		if (status < 0) {
			mlog_errno(status);
			goto bail;
		}
	}

	status = ocfs2_meta_lock(inode, &bh, 1);
	if (status < 0) {
		if (status != -ENOENT)
			mlog_errno(status);
		goto bail_unlock_rw;
	}

	if (size_change && attr->ia_size != i_size_read(inode)) {
		if (i_size_read(inode) > attr->ia_size)
			status = ocfs2_truncate_file(inode, bh, attr->ia_size);
		else
			status = ocfs2_extend_file(inode, bh, attr->ia_size, 0);
		if (status < 0) {
			if (status != -ENOSPC)
				mlog_errno(status);
			status = -ENOSPC;
			goto bail_unlock;
		}
	}

	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
	if (IS_ERR(handle)) {
		status = PTR_ERR(handle);
		mlog_errno(status);
		goto bail_unlock;
	}

	status = inode_setattr(inode, attr);
	if (status < 0) {
		mlog_errno(status);
		goto bail_commit;
	}

	status = ocfs2_mark_inode_dirty(handle, inode, bh);
	if (status < 0)
		mlog_errno(status);

bail_commit:
	ocfs2_commit_trans(osb, handle);
bail_unlock:
	ocfs2_meta_unlock(inode, 1);
bail_unlock_rw:
	if (size_change)
		ocfs2_rw_unlock(inode, 1);
bail:
	if (bh)
		brelse(bh);

	mlog_exit(status);
	return status;
}
Exemplo n.º 2
0
/* XXX care about zeroing new clusters and final partially truncated 
 * clusters */
errcode_t ocfs2_truncate_full(ocfs2_filesys *fs, uint64_t ino,
			      uint64_t new_i_size,
			      errcode_t (*free_clusters)(ocfs2_filesys *fs,
							 uint32_t len,
							 uint64_t start,
							 void *free_data),
			      void *free_data)
{
	errcode_t ret;
	uint32_t new_clusters;
	ocfs2_cached_inode *ci = NULL;

	ret = ocfs2_read_cached_inode(fs, ino, &ci);
	if (ret)
		goto out;

	/* in case of dio crashed, force do trucate since blocks may already
	 * be allocated
	 */
	if (ci->ci_inode->i_flags & cpu_to_le32(OCFS2_DIO_ORPHANED_FL)) {
		ci->ci_inode->i_flags &= ~cpu_to_le32(OCFS2_DIO_ORPHANED_FL);
		ci->ci_inode->i_dio_orphaned_slot = 0;
		new_i_size = ci->ci_inode->i_size;
		goto truncate;
	}

	if (ci->ci_inode->i_size == new_i_size)
		goto out;

	if (ci->ci_inode->i_size < new_i_size) {
		ret = ocfs2_extend_file(fs, ino, new_i_size);
		goto out;
	}

truncate:
	if ((S_ISLNK(ci->ci_inode->i_mode) && !ci->ci_inode->i_clusters) ||
	    (ci->ci_inode->i_dyn_features & OCFS2_INLINE_DATA_FL))
		ret = ocfs2_truncate_inline(fs, ino, new_i_size);
	else {
		ret = ocfs2_zero_tail_and_truncate_full(fs, ci, new_i_size,
							&new_clusters,
							free_clusters,
							free_data);
		if (ret)
			goto out;

		ci->ci_inode->i_clusters = new_clusters;

		/* now all the clusters and extent blocks are freed.
		 * only when the file's content is empty, should the tree depth
		 * change.
		 */
		if (new_clusters == 0)
			ci->ci_inode->id2.i_list.l_tree_depth = 0;

		ci->ci_inode->i_size = new_i_size;
		ret = ocfs2_write_cached_inode(fs, ci);
	}

	if (!ret && !new_i_size && ci->ci_inode->i_refcount_loc &&
		(ci->ci_inode->i_dyn_features & OCFS2_HAS_REFCOUNT_FL))
		ret = ocfs2_detach_refcount_tree(fs, ino, ci->ci_inode->i_refcount_loc);
out:
	if (ci)
		ocfs2_free_cached_inode(fs, ci);
	return ret;
}
Exemplo n.º 3
0
static int ocfs2_prepare_inode_for_write(struct dentry *dentry,
					 loff_t *ppos,
					 size_t count,
					 int appending,
					 int *direct_io)
{
	int ret = 0, meta_level = appending;
	struct inode *inode = dentry->d_inode;
	u32 clusters;
	loff_t newsize, saved_pos;

	/* 
	 * We sample i_size under a read level meta lock to see if our write
	 * is extending the file, if it is we back off and get a write level
	 * meta lock.
	 */
	for(;;) {
		ret = ocfs2_meta_lock(inode, NULL, meta_level);
		if (ret < 0) {
			meta_level = -1;
			mlog_errno(ret);
			goto out;
		}

		/* Clear suid / sgid if necessary. We do this here
		 * instead of later in the write path because
		 * remove_suid() calls ->setattr without any hint that
		 * we may have already done our cluster locking. Since
		 * ocfs2_setattr() *must* take cluster locks to
		 * proceeed, this will lead us to recursively lock the
		 * inode. There's also the dinode i_size state which
		 * can be lost via setattr during extending writes (we
		 * set inode->i_size at the end of a write. */
		if (should_remove_suid(dentry)) {
			if (meta_level == 0) {
				ocfs2_meta_unlock(inode, meta_level);
				meta_level = 1;
				continue;
			}

			ret = ocfs2_write_remove_suid(inode);
			if (ret < 0) {
				mlog_errno(ret);
				goto out_unlock;
			}
		}

		/* work on a copy of ppos until we're sure that we won't have
		 * to recalculate it due to relocking. */
		if (appending) {
			saved_pos = i_size_read(inode);
			mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos);
		} else {
			saved_pos = *ppos;
		}

		if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) {
			loff_t end = saved_pos + count;

			/*
			 * Skip the O_DIRECT checks if we don't need
			 * them.
			 */
			if (!direct_io || !(*direct_io))
				break;

			/*
			 * Allowing concurrent direct writes means
			 * i_size changes wouldn't be synchronized, so
			 * one node could wind up truncating another
			 * nodes writes.
			 */
			if (end > i_size_read(inode)) {
				*direct_io = 0;
				break;
			}

			/*
			 * We don't fill holes during direct io, so
			 * check for them here. If any are found, the
			 * caller will have to retake some cluster
			 * locks and initiate the io as buffered.
			 */
			ret = ocfs2_check_range_for_holes(inode, saved_pos,
							  count);
			if (ret == 1) {
				*direct_io = 0;
				ret = 0;
			} else if (ret < 0)
				mlog_errno(ret);
			break;
		}

		/*
		 * The rest of this loop is concerned with legacy file
		 * systems which don't support sparse files.
		 */

		newsize = count + saved_pos;

		mlog(0, "pos=%lld newsize=%lld cursize=%lld\n",
		     (long long) saved_pos, (long long) newsize,
		     (long long) i_size_read(inode));

		/* No need for a higher level metadata lock if we're
		 * never going past i_size. */
		if (newsize <= i_size_read(inode))
			break;

		if (meta_level == 0) {
			ocfs2_meta_unlock(inode, meta_level);
			meta_level = 1;
			continue;
		}

		spin_lock(&OCFS2_I(inode)->ip_lock);
		clusters = ocfs2_clusters_for_bytes(inode->i_sb, newsize) -
			OCFS2_I(inode)->ip_clusters;
		spin_unlock(&OCFS2_I(inode)->ip_lock);

		mlog(0, "Writing at EOF, may need more allocation: "
		     "i_size = %lld, newsize = %lld, need %u clusters\n",
		     (long long) i_size_read(inode), (long long) newsize,
		     clusters);

		/* We only want to continue the rest of this loop if
		 * our extend will actually require more
		 * allocation. */
		if (!clusters)
			break;

		ret = ocfs2_extend_file(inode, NULL, newsize, count);
		if (ret < 0) {
			if (ret != -ENOSPC)
				mlog_errno(ret);
			goto out_unlock;
		}
		break;
	}

	if (appending)
		*ppos = saved_pos;

out_unlock:
	ocfs2_meta_unlock(inode, meta_level);

out:
	return ret;
}