ext2: introduce new flags argument for ext2_new_blocks()

This patch introduces a new flags argument for ext2_new_blocks() and also
a new EXT2_ALLOC_NORESERVE flag.

Signed-off-by: Ye Bin <yebin10@huawei.com>
Message-Id: <20230815112612.221145-3-yebin10@huawei.com>
Signed-off-by: Jan Kara <jack@suse.cz>

Author: Ye Bin

fs/ext2/balloc.c

@@ -1195,6 +1195,7 @@ int ext2_data_block_valid(struct ext2_sb_info *sbi, ext2_fsblk_t start_blk,
  * @goal:		given target block(filesystem wide)
  * @count:		target number of blocks to allocate
  * @errp:		error code
+ * @flags:		allocate flags
  *
  * ext2_new_blocks uses a goal block to assist allocation.  If the goal is
  * free, or there is a free block within 32 blocks of the goal, that block
@@ -1204,7 +1205,7 @@ int ext2_data_block_valid(struct ext2_sb_info *sbi, ext2_fsblk_t start_blk,
  * This function also updates quota and i_blocks field.
  */
 ext2_fsblk_t ext2_new_blocks(struct inode *inode, ext2_fsblk_t goal,
-		    unsigned long *count, int *errp)
+		    unsigned long *count, int *errp, unsigned int flags)
 {
 	struct buffer_head *bitmap_bh = NULL;
 	struct buffer_head *gdp_bh;

fs/ext2/ext2.h

@@ -398,6 +398,12 @@ struct ext2_inode {
 #define EXT2_ERRORS_PANIC		3	/* Panic */
 #define EXT2_ERRORS_DEFAULT		EXT2_ERRORS_CONTINUE
 
+/*
+ * Allocation flags
+ */
+#define EXT2_ALLOC_NORESERVE            0x1	/* Do not use reservation
+						 * window for allocation */
+
 /*
  * Structure of the super block
  */
@@ -696,7 +702,7 @@ static inline struct ext2_inode_info *EXT2_I(struct inode *inode)
 extern int ext2_bg_has_super(struct super_block *sb, int group);
 extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group);
 extern ext2_fsblk_t ext2_new_blocks(struct inode *, unsigned long,
-				unsigned long *, int *);
+				unsigned long *, int *, unsigned int);
 extern int ext2_data_block_valid(struct ext2_sb_info *sbi, ext2_fsblk_t start_blk,
 				 unsigned int count);
 extern void ext2_free_blocks (struct inode *, unsigned long,

fs/ext2/inode.c

@@ -415,7 +415,7 @@ static int ext2_alloc_blocks(struct inode *inode,
 	while (1) {
 		count = target;
 		/* allocating blocks for indirect blocks and direct blocks */
-		current_block = ext2_new_blocks(inode,goal,&count,err);
+		current_block = ext2_new_blocks(inode, goal, &count, err, 0);
 		if (*err)
 			goto failed_out;
 

fs/ext2/xattr.c

@@ -744,7 +744,7 @@ ext2_xattr_set2(struct inode *inode, struct buffer_head *old_bh,
 						EXT2_I(inode)->i_block_group);
 			unsigned long count = 1;
 			ext2_fsblk_t block = ext2_new_blocks(inode, goal,
-							     &count, &error);
+							     &count, &error, 0);
 			if (error)
 				goto cleanup;
 			ea_idebug(inode, "creating block %lu", block);