2 * linux/include/linux/ext2_fs_sb.h
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
11 * linux/include/linux/minix_fs_sb.h
13 * Copyright (C) 1991, 1992 Linus Torvalds
16 #ifndef _LINUX_EXT2_FS_SB
17 #define _LINUX_EXT2_FS_SB
19 #include <linux/blockgroup_lock.h>
20 #include <linux/percpu_counter.h>
21 #include <linux/rbtree.h>
24 /* data type for block offset of block group */
25 typedef int ext2_grpblk_t
;
27 /* data type for filesystem-wide blocks number */
28 typedef unsigned long ext2_fsblk_t
;
32 struct ext2_reserve_window
{
33 ext2_fsblk_t _rsv_start
; /* First byte reserved */
34 ext2_fsblk_t _rsv_end
; /* Last byte reserved or 0 */
37 struct ext2_reserve_window_node
{
38 struct rb_node rsv_node
;
41 struct ext2_reserve_window rsv_window
;
44 struct ext2_block_alloc_info
{
45 /* information about reservation window */
46 struct ext2_reserve_window_node rsv_window_node
;
48 * was i_next_alloc_block in ext2_inode_info
49 * is the logical (file-relative) number of the
50 * most-recently-allocated block in this file.
51 * We use this for detecting linearly ascending allocation requests.
53 __u32 last_alloc_logical_block
;
55 * Was i_next_alloc_goal in ext2_inode_info
56 * is the *physical* companion to i_next_alloc_block.
57 * it the the physical block number of the block which was most-recentl
58 * allocated to this file. This give us the goal (target) for the next
59 * allocation when we detect linearly ascending requests.
61 ext2_fsblk_t last_alloc_physical_block
;
64 #define rsv_start rsv_window._rsv_start
65 #define rsv_end rsv_window._rsv_end
68 * second extended-fs super-block data in memory
71 unsigned long s_frag_size
; /* Size of a fragment in bytes */
72 unsigned long s_frags_per_block
;/* Number of fragments per block */
73 unsigned long s_inodes_per_block
;/* Number of inodes per block */
74 unsigned long s_frags_per_group
;/* Number of fragments in a group */
75 unsigned long s_blocks_per_group
;/* Number of blocks in a group */
76 unsigned long s_inodes_per_group
;/* Number of inodes in a group */
77 unsigned long s_itb_per_group
; /* Number of inode table blocks per group */
78 unsigned long s_gdb_count
; /* Number of group descriptor blocks */
79 unsigned long s_desc_per_block
; /* Number of group descriptors per block */
80 unsigned long s_groups_count
; /* Number of groups in the fs */
81 unsigned long s_overhead_last
; /* Last calculated overhead */
82 unsigned long s_blocks_last
; /* Last seen block count */
83 struct buffer_head
* s_sbh
; /* Buffer containing the super block */
84 struct ext2_super_block
* s_es
; /* Pointer to the super block in the buffer */
85 struct buffer_head
** s_group_desc
;
86 unsigned long s_mount_opt
;
87 unsigned long s_sb_block
;
90 unsigned short s_mount_state
;
92 int s_addr_per_block_bits
;
93 int s_desc_per_block_bits
;
96 spinlock_t s_next_gen_lock
;
97 u32 s_next_generation
;
98 unsigned long s_dir_count
;
100 struct percpu_counter s_freeblocks_counter
;
101 struct percpu_counter s_freeinodes_counter
;
102 struct percpu_counter s_dirs_counter
;
103 struct blockgroup_lock
*s_blockgroup_lock
;
104 /* root of the per fs reservation window tree */
105 spinlock_t s_rsv_window_lock
;
106 struct rb_root s_rsv_window_root
;
107 struct ext2_reserve_window_node s_rsv_window_head
;
109 * s_lock protects against concurrent modifications of s_mount_state,
110 * s_blocks_last, s_overhead_last and the content of superblock's
111 * buffer pointed to by sbi->s_es.
113 * Note: It is used in ext2_show_options() to provide a consistent view
114 * of the mount options.
119 static inline spinlock_t
*
120 sb_bgl_lock(struct ext2_sb_info
*sbi
, unsigned int block_group
)
122 return bgl_lock_ptr(sbi
->s_blockgroup_lock
, block_group
);
125 #endif /* _LINUX_EXT2_FS_SB */