Commit a36b4498 authored by Eric Sandeen's avatar Eric Sandeen Committed by Theodore Ts'o
Browse files

ext4: use ext4_grpblk_t more extensively 



unsigned  short is potentially too small to track blocks within
a group; today it is safe due to restrictions in e2fsprogs but
we have _lo / _hi bits for group blocks with the intent to go
up to 32 bits, so clean this up now.

There are many more places where we use unsigned/int/unsigned int
to contain a group block but this should at least fix all the
short types.

I added a few comments to the struct ext4_group_info definition
as well.

Signed-off-by: default avatarEric Sandeen <sandeen@redhat.com>
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
parent 1927805e

fs/ext4/ext4.h

+7 −4
Original line number Diff line number Diff line
@@ -1577,15 +1577,18 @@ static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 
struct ext4_group_info {

	unsigned long   bb_state;

	struct rb_root  bb_free_root;

	unsigned short  bb_first_free;

	unsigned short  bb_free;

	unsigned short  bb_fragments;

	ext4_grpblk_t	bb_first_free;	/* first free block */

	ext4_grpblk_t	bb_free;	/* total free blocks */

	ext4_grpblk_t	bb_fragments;	/* nr of freespace fragments */

	struct          list_head bb_prealloc_list;

#ifdef DOUBLE_CHECK

	void            *bb_bitmap;

#endif

	struct rw_semaphore alloc_sem;

	unsigned short  bb_counters[];

	ext4_grpblk_t	bb_counters[];	/* Nr of free power-of-two-block

					 * regions, index is order.

					 * bb_counters[3] = 5 means

					 * 5 free 8-block regions. */

};



#define EXT4_GROUP_INFO_NEED_INIT_BIT	0

fs/ext4/mballoc.c

+9 −9
Original line number Diff line number Diff line
@@ -623,13 +623,13 @@ static int __mb_check_buddy(struct ext4_buddy *e4b, char *file, 


/* FIXME!! need more doc */

static void ext4_mb_mark_free_simple(struct super_block *sb,

				void *buddy, unsigned first, int len,

				void *buddy, ext4_grpblk_t first, ext4_grpblk_t len,

					struct ext4_group_info *grp)

{

	struct ext4_sb_info *sbi = EXT4_SB(sb);

	unsigned short min;

	unsigned short max;

	unsigned short chunk;

	ext4_grpblk_t min;

	ext4_grpblk_t max;

	ext4_grpblk_t chunk;

	unsigned short border;



	BUG_ON(len > EXT4_BLOCKS_PER_GROUP(sb));
@@ -663,10 +663,10 @@ void ext4_mb_generate_buddy(struct super_block *sb, 
				void *buddy, void *bitmap, ext4_group_t group)

{

	struct ext4_group_info *grp = ext4_get_group_info(sb, group);

	unsigned short max = EXT4_BLOCKS_PER_GROUP(sb);

	unsigned short i = 0;

	unsigned short first;

	unsigned short len;

	ext4_grpblk_t max = EXT4_BLOCKS_PER_GROUP(sb);

	ext4_grpblk_t i = 0;

	ext4_grpblk_t first;

	ext4_grpblk_t len;

	unsigned free = 0;

	unsigned fragments = 0;

	unsigned long long period = get_cycles();
@@ -2325,7 +2325,7 @@ static int ext4_mb_seq_groups_show(struct seq_file *seq, void *v) 
	struct ext4_buddy e4b;

	struct sg {

		struct ext4_group_info info;

		unsigned short counters[16];

		ext4_grpblk_t counters[16];

	} sg;



	group--;

fs/ext4/mballoc.h

+3 −3
Original line number Diff line number Diff line
@@ -136,8 +136,8 @@ struct ext4_prealloc_space { 
	unsigned		pa_deleted;

	ext4_fsblk_t		pa_pstart;	/* phys. block */

	ext4_lblk_t		pa_lstart;	/* log. block */

	unsigned short		pa_len;		/* len of preallocated chunk */

	unsigned short		pa_free;	/* how many blocks are free */

	ext4_grpblk_t		pa_len;		/* len of preallocated chunk */

	ext4_grpblk_t		pa_free;	/* how many blocks are free */

	unsigned short		pa_type;	/* pa type. inode or group */

	spinlock_t		*pa_obj_lock;

	struct inode		*pa_inode;	/* hack, for history only */
@@ -152,7 +152,7 @@ struct ext4_free_extent { 
	ext4_lblk_t fe_logical;

	ext4_grpblk_t fe_start;

	ext4_group_t fe_group;

	int fe_len;

	ext4_grpblk_t fe_len;

};



/*

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