ext4: Get rid of EXTEND_DISKSIZE flag of ext4_get_blocks_handle()

Get rid of EXTEND_DISKSIZE flag of ext4_get_blocks_handle(). This
seems to be a relict from some old days and setting disksize in this
function does not make much sense.  Currently it was set only by
ext4_getblk().  Since the parameter has some effect only if create ==
1, it is easy to check by grepping through the sources that the three
callers which end up calling ext4_getblk() with create == 1
(ext4_append, ext4_quota_write, ext4_mkdir) do the right thing and set
disksize themselves.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

fs/ext4/ext4.h

@@ -323,15 +323,13 @@ struct ext4_new_group_data {
 #define EXT4_GET_BLOCKS_UNINIT_EXT		0x0002
 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT	(EXT4_GET_BLOCKS_UNINIT_EXT|\
 						 EXT4_GET_BLOCKS_CREATE)
-	/* Update the ext4_inode_info i_disksize field */
-#define EXT4_GET_BLOCKS_EXTEND_DISKSIZE		0x0004
 	/* Caller is from the delayed allocation writeout path,
 	   so set the magic i_delalloc_reserve_flag after taking the 
 	   inode allocation semaphore for */
-#define EXT4_GET_BLOCKS_DELALLOC_RESERVE	0x0008
+#define EXT4_GET_BLOCKS_DELALLOC_RESERVE	0x0004
 	/* Call ext4_da_update_reserve_space() after successfully 
 	   allocating the blocks */
-#define EXT4_GET_BLOCKS_UPDATE_RESERVE_SPACE	0x0010
+#define EXT4_GET_BLOCKS_UPDATE_RESERVE_SPACE	0x0008
 
 
 /*

fs/ext4/extents.c

@@ -2779,7 +2779,6 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
 	int err = 0, depth, ret, cache_type;
 	unsigned int allocated = 0;
 	struct ext4_allocation_request ar;
-	loff_t disksize;
 
 	__clear_bit(BH_New, &bh_result->b_state);
 	ext_debug("blocks %u/%u requested for inode %u\n",
@@ -2969,14 +2968,6 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
 	newblock = ext_pblock(&newex);
 	allocated = ext4_ext_get_actual_len(&newex);
 outnew:
-	if (flags & EXT4_GET_BLOCKS_EXTEND_DISKSIZE) {
-		disksize = ((loff_t) iblock + ar.len) << inode->i_blkbits;
-		if (disksize > i_size_read(inode))
-			disksize = i_size_read(inode);
-		if (disksize > EXT4_I(inode)->i_disksize)
-			EXT4_I(inode)->i_disksize = disksize;
-	}
-
 	set_buffer_new(bh_result);
 
 	/* Cache only when it is _not_ an uninitialized extent */

fs/ext4/inode.c

@@ -933,11 +933,8 @@ static int ext4_ind_get_blocks(handle_t *handle, struct inode *inode,
 	int indirect_blks;
 	int blocks_to_boundary = 0;
 	int depth;
-	struct ext4_inode_info *ei = EXT4_I(inode);
 	int count = 0;
 	ext4_fsblk_t first_block = 0;
-	loff_t disksize;
-
 
 	J_ASSERT(!(EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL));
 	J_ASSERT(handle != NULL || (flags & EXT4_GET_BLOCKS_CREATE) == 0);
@@ -1003,19 +1000,7 @@ static int ext4_ind_get_blocks(handle_t *handle, struct inode *inode,
 	if (!err)
 		err = ext4_splice_branch(handle, inode, iblock,
 					partial, indirect_blks, count);
-	/*
-	 * i_disksize growing is protected by i_data_sem.  Don't forget to
-	 * protect it if you're about to implement concurrent
-	 * ext4_get_block() -bzzz
-	*/
-	if (!err && (flags & EXT4_GET_BLOCKS_EXTEND_DISKSIZE)) {
-		disksize = ((loff_t) iblock + count) << inode->i_blkbits;
-		if (disksize > i_size_read(inode))
-			disksize = i_size_read(inode);
-		if (disksize > ei->i_disksize)
-			ei->i_disksize = disksize;
-	}
-	if (err)
+	else 
 		goto cleanup;
 
 	set_buffer_new(bh_result);
@@ -1321,7 +1306,7 @@ struct buffer_head *ext4_getblk(handle_t *handle, struct inode *inode,
 {
 	struct buffer_head dummy;
 	int fatal = 0, err;
-	int flags = EXT4_GET_BLOCKS_EXTEND_DISKSIZE;
+	int flags = 0;
 
 	J_ASSERT(handle != NULL || create == 0);
 
@@ -2153,9 +2138,7 @@ static int mpage_da_map_blocks(struct mpage_da_data *mpd)
 	}
 
 	/*
-	 * Update on-disk size along with block allocation we don't
-	 * use EXT4_GET_BLOCKS_EXTEND_DISKSIZE as size may change
-	 * within already allocated block -bzzz
+	 * Update on-disk size along with block allocation.
 	 */
 	disksize = ((loff_t) next + blks) << mpd->inode->i_blkbits;
 	if (disksize > i_size_read(mpd->inode))