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c15271f4e7
Add a spinlock that protects against concurrent modifications of s_mount_state, s_blocks_last, s_overhead_last and the content of the superblock's buffer pointed to by sbi->s_es. The spinlock is now used in ext2_xattr_update_super_block() which was setting the EXT2_FEATURE_COMPAT_EXT_ATTR flag on the superblock without protection before. Likewise the spinlock is used in ext2_show_options() to have a consistent view of the mount options. This is a preparation patch for removing the BKL from ext2 in the next patch. Signed-off-by: Jan Blunck <jblunck@suse.de> Cc: Andi Kleen <andi@firstfloor.org> Cc: Jan Kara <jack@suse.cz> Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: Jan Kara <jack@suse.cz>
127 lines
4.0 KiB
C
127 lines
4.0 KiB
C
/*
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* linux/include/linux/ext2_fs_sb.h
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*
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* Copyright (C) 1992, 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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*
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* from
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*
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* linux/include/linux/minix_fs_sb.h
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*/
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#ifndef _LINUX_EXT2_FS_SB
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#define _LINUX_EXT2_FS_SB
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#include <linux/blockgroup_lock.h>
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#include <linux/percpu_counter.h>
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#include <linux/rbtree.h>
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/* XXX Here for now... not interested in restructing headers JUST now */
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/* data type for block offset of block group */
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typedef int ext2_grpblk_t;
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/* data type for filesystem-wide blocks number */
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typedef unsigned long ext2_fsblk_t;
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#define E2FSBLK "%lu"
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struct ext2_reserve_window {
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ext2_fsblk_t _rsv_start; /* First byte reserved */
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ext2_fsblk_t _rsv_end; /* Last byte reserved or 0 */
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};
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struct ext2_reserve_window_node {
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struct rb_node rsv_node;
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__u32 rsv_goal_size;
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__u32 rsv_alloc_hit;
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struct ext2_reserve_window rsv_window;
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};
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struct ext2_block_alloc_info {
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/* information about reservation window */
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struct ext2_reserve_window_node rsv_window_node;
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/*
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* was i_next_alloc_block in ext2_inode_info
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* is the logical (file-relative) number of the
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* most-recently-allocated block in this file.
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* We use this for detecting linearly ascending allocation requests.
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*/
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__u32 last_alloc_logical_block;
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/*
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* Was i_next_alloc_goal in ext2_inode_info
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* is the *physical* companion to i_next_alloc_block.
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* it the the physical block number of the block which was most-recentl
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* allocated to this file. This give us the goal (target) for the next
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* allocation when we detect linearly ascending requests.
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*/
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ext2_fsblk_t last_alloc_physical_block;
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};
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#define rsv_start rsv_window._rsv_start
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#define rsv_end rsv_window._rsv_end
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/*
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* second extended-fs super-block data in memory
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*/
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struct ext2_sb_info {
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unsigned long s_frag_size; /* Size of a fragment in bytes */
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unsigned long s_frags_per_block;/* Number of fragments per block */
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unsigned long s_inodes_per_block;/* Number of inodes per block */
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unsigned long s_frags_per_group;/* Number of fragments in a group */
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unsigned long s_blocks_per_group;/* Number of blocks in a group */
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unsigned long s_inodes_per_group;/* Number of inodes in a group */
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unsigned long s_itb_per_group; /* Number of inode table blocks per group */
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unsigned long s_gdb_count; /* Number of group descriptor blocks */
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unsigned long s_desc_per_block; /* Number of group descriptors per block */
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unsigned long s_groups_count; /* Number of groups in the fs */
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unsigned long s_overhead_last; /* Last calculated overhead */
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unsigned long s_blocks_last; /* Last seen block count */
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struct buffer_head * s_sbh; /* Buffer containing the super block */
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struct ext2_super_block * s_es; /* Pointer to the super block in the buffer */
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struct buffer_head ** s_group_desc;
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unsigned long s_mount_opt;
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unsigned long s_sb_block;
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uid_t s_resuid;
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gid_t s_resgid;
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unsigned short s_mount_state;
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unsigned short s_pad;
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int s_addr_per_block_bits;
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int s_desc_per_block_bits;
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int s_inode_size;
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int s_first_ino;
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spinlock_t s_next_gen_lock;
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u32 s_next_generation;
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unsigned long s_dir_count;
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u8 *s_debts;
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struct percpu_counter s_freeblocks_counter;
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struct percpu_counter s_freeinodes_counter;
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struct percpu_counter s_dirs_counter;
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struct blockgroup_lock *s_blockgroup_lock;
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/* root of the per fs reservation window tree */
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spinlock_t s_rsv_window_lock;
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struct rb_root s_rsv_window_root;
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struct ext2_reserve_window_node s_rsv_window_head;
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/*
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* s_lock protects against concurrent modifications of s_mount_state,
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* s_blocks_last, s_overhead_last and the content of superblock's
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* buffer pointed to by sbi->s_es.
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*
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* Note: It is used in ext2_show_options() to provide a consistent view
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* of the mount options.
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*/
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spinlock_t s_lock;
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};
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static inline spinlock_t *
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sb_bgl_lock(struct ext2_sb_info *sbi, unsigned int block_group)
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{
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return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group);
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}
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#endif /* _LINUX_EXT2_FS_SB */
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