befs: improve documentation in datastream.c

Convert function descriptions to kernel-doc style.

Signed-off-by: Luis de Bethencourt <luisbg@osg.samsung.com>
Signed-off-by: Salah Triki <salah.triki@gmail.com>

fs/befs/datastream.c

@@ -75,7 +75,13 @@ befs_read_datastream(struct super_block *sb, const befs_data_stream *ds,
 	return bh;
 }
 
-/*
+/**
+ * befs_fblock2brun - give back block run for fblock
+ * @sb: the superblock
+ * @data: datastream to read from
+ * @fblock: the blocknumber with the file position to find
+ * @run: The found run is passed back through this pointer
+ *
  * Takes a file position and gives back a brun who's starting block
  * is block number fblock of the file.
  * 
@@ -212,36 +218,35 @@ befs_count_blocks(struct super_block *sb, const befs_data_stream *ds)
 	return blocks;
 }
 
-/*
-	Finds the block run that starts at file block number blockno
-	in the file represented by the datastream data, if that 
-	blockno is in the direct region of the datastream.
-	
-	sb: the superblock
-	data: the datastream
-	blockno: the blocknumber to find
-	run: The found run is passed back through this pointer
-	
-	Return value is BEFS_OK if the blockrun is found, BEFS_ERR
-	otherwise.
-	
-	Algorithm:
-	Linear search. Checks each element of array[] to see if it
-	contains the blockno-th filesystem block. This is necessary
-	because the block runs map variable amounts of data. Simply
-	keeps a count of the number of blocks searched so far (sum),
-	incrementing this by the length of each block run as we come
-	across it. Adds sum to *count before returning (this is so
-	you can search multiple arrays that are logicaly one array,
-	as in the indirect region code).
-	
-	When/if blockno is found, if blockno is inside of a block 
-	run as stored on disk, we offset the start and length members
-	of the block run, so that blockno is the start and len is
-	still valid (the run ends in the same place).
-	
-	2001-11-15 Will Dyson
-*/
+/**
+ * befs_find_brun_direct - find a direct block run in the datastream
+ * @sb: the superblock
+ * @data: the datastream
+ * @blockno: the blocknumber to find
+ * @run: The found run is passed back through this pointer
+ *
+ * Finds the block run that starts at file block number blockno
+ * in the file represented by the datastream data, if that
+ * blockno is in the direct region of the datastream.
+ *
+ * Return value is BEFS_OK if the blockrun is found, BEFS_ERR
+ * otherwise.
+ *
+ * Algorithm:
+ * Linear search. Checks each element of array[] to see if it
+ * contains the blockno-th filesystem block. This is necessary
+ * because the block runs map variable amounts of data. Simply
+ * keeps a count of the number of blocks searched so far (sum),
+ * incrementing this by the length of each block run as we come
+ * across it. Adds sum to *count before returning (this is so
+ * you can search multiple arrays that are logicaly one array,
+ * as in the indirect region code).
+ *
+ * When/if blockno is found, if blockno is inside of a block
+ * run as stored on disk, we offset the start and length members
+ * of the block run, so that blockno is the start and len is
+ * still valid (the run ends in the same place).
+ */
 static int
 befs_find_brun_direct(struct super_block *sb, const befs_data_stream *data,
 		      befs_blocknr_t blockno, befs_block_run * run)
@@ -273,29 +278,28 @@ befs_find_brun_direct(struct super_block *sb, const befs_data_stream *data,
 	return BEFS_ERR;
 }
 
-/*
-	Finds the block run that starts at file block number blockno
-	in the file represented by the datastream data, if that 
-	blockno is in the indirect region of the datastream.
-	
-	sb: the superblock
-	data: the datastream
-	blockno: the blocknumber to find
-	run: The found run is passed back through this pointer
-	
-	Return value is BEFS_OK if the blockrun is found, BEFS_ERR
-	otherwise.
-	
-	Algorithm:
-	For each block in the indirect run of the datastream, read
-	it in and search through it for	search_blk.
-	
-	XXX:
-	Really should check to make sure blockno is inside indirect
-	region.
-	
-	2001-11-15 Will Dyson
-*/
+/**
+ * befs_find_brun_indirect - find a block run in the datastream
+ * @sb: the superblock
+ * @data: the datastream
+ * @blockno: the blocknumber to find
+ * @run: The found run is passed back through this pointer
+ *
+ * Finds the block run that starts at file block number blockno
+ * in the file represented by the datastream data, if that
+ * blockno is in the indirect region of the datastream.
+ *
+ * Return value is BEFS_OK if the blockrun is found, BEFS_ERR
+ * otherwise.
+ *
+ * Algorithm:
+ * For each block in the indirect run of the datastream, read
+ * it in and search through it for search_blk.
+ *
+ * XXX:
+ * Really should check to make sure blockno is inside indirect
+ * region.
+ */
 static int
 befs_find_brun_indirect(struct super_block *sb,
 			const befs_data_stream *data,
@@ -365,47 +369,46 @@ befs_find_brun_indirect(struct super_block *sb,
 	return BEFS_ERR;
 }
 
-/*
-	Finds the block run that starts at file block number blockno
-	in the file represented by the datastream data, if that 
-	blockno is in the double-indirect region of the datastream.
-	
-	sb: the superblock
-	data: the datastream
-	blockno: the blocknumber to find
-	run: The found run is passed back through this pointer
-	
-	Return value is BEFS_OK if the blockrun is found, BEFS_ERR
-	otherwise.
-	
-	Algorithm:
-	The block runs in the double-indirect region are different.
-	They are always allocated 4 fs blocks at a time, so each
-	block run maps a constant amount of file data. This means
-	that we can directly calculate how many block runs into the
-	double-indirect region we need to go to get to the one that
-	maps a particular filesystem block.
-	
-	We do this in two stages. First we calculate which of the
-	inode addresses in the double-indirect block will point us
-	to the indirect block that contains the mapping for the data,
-	then we calculate which of the inode addresses in that 
-	indirect block maps the data block we are after.
-	
-	Oh, and once we've done that, we actually read in the blocks 
-	that contain the inode addresses we calculated above. Even 
-	though the double-indirect run may be several blocks long, 
-	we can calculate which of those blocks will contain the index
-	we are after and only read that one. We then follow it to 
-	the indirect block and perform a similar process to find
-	the actual block run that maps the data block we are interested
-	in.
-	
-	Then we offset the run as in befs_find_brun_array() and we are 
-	done.
-	
-	2001-11-15 Will Dyson
-*/
+/**
+ * befs_find_brun_dblindirect - find a block run in the datastream
+ * @sb: the superblock
+ * @data: the datastream
+ * @blockno: the blocknumber to find
+ * @run: The found run is passed back through this pointer
+ *
+ * Finds the block run that starts at file block number blockno
+ * in the file represented by the datastream data, if that
+ * blockno is in the double-indirect region of the datastream.
+ *
+ * Return value is BEFS_OK if the blockrun is found, BEFS_ERR
+ * otherwise.
+ *
+ * Algorithm:
+ * The block runs in the double-indirect region are different.
+ * They are always allocated 4 fs blocks at a time, so each
+ * block run maps a constant amount of file data. This means
+ * that we can directly calculate how many block runs into the
+ * double-indirect region we need to go to get to the one that
+ * maps a particular filesystem block.
+ *
+ * We do this in two stages. First we calculate which of the
+ * inode addresses in the double-indirect block will point us
+ * to the indirect block that contains the mapping for the data,
+ * then we calculate which of the inode addresses in that
+ * indirect block maps the data block we are after.
+ *
+ * Oh, and once we've done that, we actually read in the blocks
+ * that contain the inode addresses we calculated above. Even
+ * though the double-indirect run may be several blocks long,
+ * we can calculate which of those blocks will contain the index
+ * we are after and only read that one. We then follow it to
+ * the indirect block and perform a similar process to find
+ * the actual block run that maps the data block we are interested
+ * in.
+ *
+ * Then we offset the run as in befs_find_brun_array() and we are
+ * done.
+ */
 static int
 befs_find_brun_dblindirect(struct super_block *sb,
 			   const befs_data_stream *data,