fs/ext4/balloc.c

30  * balloc.c contains the blocks allocation and deallocation routines
102 	 * descriptor blocks */
132 	 * Normally all of these blocks are contiguous, so the special
165 	unsigned int blocks;
172 		 * blocks.
174 		blocks = ext4_blocks_count(EXT4_SB(sb)->s_es) -
177 		blocks = EXT4_BLOCKS_PER_GROUP(sb);
178 	return EXT4_NUM_B2C(EXT4_SB(sb), blocks);
227 	 * Also if the number of blocks within the group is less than
236 /* Return the number of free blocks in a block group.  It is used when
248  * The free blocks are managed by bitmaps.  A file system contains several
249  * blocks groups.  Each group contains 1 bitmap block for blocks, 1 bitmap
250  * block for inodes, N blocks for the inode table and data blocks.
254  * the free blocks count in the block.  The descriptors are loaded in memory
358 		 * blocks may not be in the group at all
614  * @nclusters:	number of needed blocks
659 	/* No free blocks. Let's see if we can dip into reserved pool */
684  * attempting to allocate blocks.  If there's an indication that a pending
702 	 * if there's no indication that blocks are about to be freed it's
725  * ext4_new_meta_blocks() -- allocate block for meta data (indexing) blocks
744 	/* Fill with neighbour allocated blocks */
754 	 * Account for the allocated meta blocks.  We will never
847  *	ext4_bg_has_super - number of blocks used by the superblock in group
851  *	Return the number of blocks used by the superblock (primary or backup)
902  *	ext4_bg_num_gdb - number of blocks used by the group table in group
906  *	Return the number of blocks used by the group descriptor table
908  *	different number of descriptor blocks in each group.
924  * This function returns the number of file system metadata blocks at
925  * the beginning of a block group, including the reserved gdt blocks.
959  *	Return the ideal location to start allocating blocks for a