udf: Implement adding of dir entries using new iteration code

Implement function udf_fiiter_add_entry() adding new directory entries
using new directory iteration code.

Signed-off-by: Jan Kara <jack@suse.cz>

1 files changed, 110 insertions, 0 deletions

diff --git a/fs/udf/namei.c b/fs/udf/namei.c
index d0ffd2083519..2e423c10dc99 100644
--- a/fs/udf/namei.c
+++ b/fs/udf/namei.c
@@ -472,6 +472,116 @@ static struct buffer_head *udf_expand_dir_adinicb(struct inode *inode,
 	return dbh;
 }
 
+static int udf_fiiter_add_entry(struct inode *dir, struct dentry *dentry,
+				struct udf_fileident_iter *iter)
+{
+	struct udf_inode_info *dinfo = UDF_I(dir);
+	int nfidlen, namelen = 0;
+	int ret;
+	int off, blksize = 1 << dir->i_blkbits;
+	udf_pblk_t block;
+	char name[UDF_NAME_LEN_CS0];
+
+	if (dentry) {
+		if (!dentry->d_name.len)
+			return -EINVAL;
+		namelen = udf_put_filename(dir->i_sb, dentry->d_name.name,
+					   dentry->d_name.len,
+					   name, UDF_NAME_LEN_CS0);
+		if (!namelen)
+			return -ENAMETOOLONG;
+	}
+	nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD);
+
+	for (ret = udf_fiiter_init(iter, dir, 0);
+	     !ret && iter->pos < dir->i_size;
+	     ret = udf_fiiter_advance(iter)) {
+		if (iter->fi.fileCharacteristics & FID_FILE_CHAR_DELETED) {
+			if (udf_dir_entry_len(&iter->fi) == nfidlen) {
+				iter->fi.descTag.tagSerialNum = cpu_to_le16(1);
+				iter->fi.fileVersionNum = cpu_to_le16(1);
+				iter->fi.fileCharacteristics = 0;
+				iter->fi.lengthFileIdent = namelen;
+				iter->fi.lengthOfImpUse = cpu_to_le16(0);
+				memcpy(iter->namebuf, name, namelen);
+				iter->name = iter->namebuf;
+				return 0;
+			}
+		}
+	}
+	if (ret) {
+		udf_fiiter_release(iter);
+		return ret;
+	}
+	if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
+	    blksize - udf_ext0_offset(dir) - iter->pos < nfidlen) {
+		struct buffer_head *retbh;
+
+		udf_fiiter_release(iter);
+		/*
+		 * FIXME: udf_expand_dir_adinicb does not need to return bh
+		 * once other users are gone
+		 */
+		retbh = udf_expand_dir_adinicb(dir, &block, &ret);
+		if (!retbh)
+			return ret;
+		brelse(retbh);
+		ret = udf_fiiter_init(iter, dir, dir->i_size);
+		if (ret < 0)
+			return ret;
+	}
+
+	/* Get blocknumber to use for entry tag */
+	if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
+		block = dinfo->i_location.logicalBlockNum;
+	} else {
+		block = iter->eloc.logicalBlockNum +
+				((iter->elen - 1) >> dir->i_blkbits);
+	}
+	off = iter->pos & (blksize - 1);
+	if (!off)
+		off = blksize;
+	/* Entry fits into current block? */
+	if (blksize - udf_ext0_offset(dir) - off >= nfidlen)
+		goto store_fi;
+
+	ret = udf_fiiter_append_blk(iter);
+	if (ret) {
+		udf_fiiter_release(iter);
+		return ret;
+	}
+
+	/* Entry will be completely in the new block? Update tag location... */
+	if (!(iter->pos & (blksize - 1)))
+		block = iter->eloc.logicalBlockNum +
+				((iter->elen - 1) >> dir->i_blkbits);
+store_fi:
+	memset(&iter->fi, 0, sizeof(struct fileIdentDesc));
+	if (UDF_SB(dir->i_sb)->s_udfrev >= 0x0200)
+		udf_new_tag((char *)(&iter->fi), TAG_IDENT_FID, 3, 1, block,
+			    sizeof(struct tag));
+	else
+		udf_new_tag((char *)(&iter->fi), TAG_IDENT_FID, 2, 1, block,
+			    sizeof(struct tag));
+	iter->fi.fileVersionNum = cpu_to_le16(1);
+	iter->fi.lengthFileIdent = namelen;
+	iter->fi.lengthOfImpUse = cpu_to_le16(0);
+	memcpy(iter->namebuf, name, namelen);
+	iter->name = iter->namebuf;
+
+	dir->i_size += nfidlen;
+	if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
+		dinfo->i_lenAlloc += nfidlen;
+	} else {
+		/* Truncate last extent to proper size */
+		udf_fiiter_update_elen(iter, iter->elen -
+					(dinfo->i_lenExtents - dir->i_size));
+	}
+	mark_inode_dirty(dir);
+
+	return 0;
+}
+
 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
 					   struct dentry *dentry,
 					   struct udf_fileident_bh *fibh,