diff options
Diffstat (limited to 'linux-2.4.x/include/linux/jffs2_fs_sb.h')
| -rw-r--r-- | linux-2.4.x/include/linux/jffs2_fs_sb.h | 141 |
1 files changed, 102 insertions, 39 deletions
diff --git a/linux-2.4.x/include/linux/jffs2_fs_sb.h b/linux-2.4.x/include/linux/jffs2_fs_sb.h index 626c8c5..f6ffe78 100644 --- a/linux-2.4.x/include/linux/jffs2_fs_sb.h +++ b/linux-2.4.x/include/linux/jffs2_fs_sb.h @@ -1,84 +1,147 @@ -/* $Id: jffs2_fs_sb.h,v 1.16.2.1 2002/02/23 14:13:34 dwmw2 Exp $ */ +/* $Id: jffs2_fs_sb.h,v 1.60 2005/11/29 14:34:37 gleixner Exp $ */ #ifndef _JFFS2_FS_SB #define _JFFS2_FS_SB #include <linux/types.h> #include <linux/spinlock.h> +#include <linux/workqueue.h> #include <linux/completion.h> #include <asm/semaphore.h> +#include <linux/timer.h> +#include <linux/wait.h> #include <linux/list.h> - -#define INOCACHE_HASHSIZE 1 +#include <linux/rwsem.h> #define JFFS2_SB_FLAG_RO 1 -#define JFFS2_SB_FLAG_MOUNTING 2 +#define JFFS2_SB_FLAG_SCANNING 2 /* Flash scanning is in progress */ +#define JFFS2_SB_FLAG_BUILDING 4 /* File system building is in progress */ + +#define MAX_ERASE_COUNT_BIT_LEN 18 +#define MAX_ERASE_COUNT (1 << MAX_ERASE_COUNT_BIT_LEN) /* The maximum guaranteed erase cycles for NAND and NOR are ~ 100K at the moment */ +#define WL_DELTA_BIT_LEN 10 +#define WL_DELTA (1 << WL_DELTA_BIT_LEN) /* This is wear-leveling delta, which is defined as "maximum of all erase counts - minimum of all erase counts" */ +#define HASH_SIZE_BIT_LEN (MAX_ERASE_COUNT_BIT_LEN - WL_DELTA_BIT_LEN + 1) /* The range size of per-bucket is half of WL_DELTA */ +#define HASH_SIZE (1 << HASH_SIZE_BIT_LEN) +#define BUCKET_RANGE_BIT_LEN (MAX_ERASE_COUNT_BIT_LEN - HASH_SIZE_BIT_LEN) +#define BUCKET_RANGE (1 << BUCKET_RANGE_BIT_LEN) + +struct jffs2_blocks_bucket { + uint32_t number; /* The number of erase blocks in this bucket*/ + struct list_head chain; /* The head of erase blocks in this bucket */ +}; + +struct jffs2_inodirty; /* A struct for the overall file system control. Pointers to - jffs2_sb_info structs are named `c' in the source code. + jffs2_sb_info structs are named `c' in the source code. Nee jffs_control */ struct jffs2_sb_info { struct mtd_info *mtd; - __u32 highest_ino; + uint32_t highest_ino; + uint32_t checked_ino; + unsigned int flags; - spinlock_t nodelist_lock; - // pid_t thread_pid; /* GC thread's PID */ struct task_struct *gc_task; /* GC task struct */ - struct semaphore gc_thread_start; /* GC thread start mutex */ + struct completion gc_thread_start; /* GC thread start completion */ struct completion gc_thread_exit; /* GC thread exit completion port */ - // __u32 gc_minfree_threshold; /* GC trigger thresholds */ - // __u32 gc_maxdirty_threshold; - struct semaphore alloc_sem; /* Used to protect all the following + struct semaphore alloc_sem; /* Used to protect all the following fields, and also to protect against - out-of-order writing of nodes. - And GC. - */ - __u32 flash_size; - __u32 used_size; - __u32 dirty_size; - __u32 free_size; - __u32 erasing_size; - __u32 bad_size; - __u32 sector_size; - // __u32 min_free_size; - // __u32 max_chunk_size; - - __u32 nr_free_blocks; - __u32 nr_erasing_blocks; - - __u32 nr_blocks; - struct jffs2_eraseblock *blocks; /* The whole array of blocks. Used for getting blocks + out-of-order writing of nodes. And GC. */ + uint32_t cleanmarker_size; /* Size of an _inline_ CLEANMARKER + (i.e. zero for OOB CLEANMARKER */ + + uint32_t flash_size; + uint32_t used_size; + uint32_t dirty_size; + uint32_t wasted_size; + uint32_t free_size; + uint32_t erasing_size; + uint32_t bad_size; + uint32_t sector_size; + uint32_t unchecked_size; + + uint32_t nr_free_blocks; + uint32_t nr_erasing_blocks; + + /* Number of free blocks there must be before we... */ + uint8_t resv_blocks_write; /* ... allow a normal filesystem write */ + uint8_t resv_blocks_deletion; /* ... allow a normal filesystem deletion */ + uint8_t resv_blocks_gctrigger; /* ... wake up the GC thread */ + uint8_t resv_blocks_gcbad; /* ... pick a block from the bad_list to GC */ + uint8_t resv_blocks_gcmerge; /* ... merge pages when garbage collecting */ + + uint32_t nospc_dirty_size; + + uint32_t nr_blocks; + struct jffs2_eraseblock **blocks; /* The whole array of blocks. Used for getting blocks * from the offset (blocks[ofs / sector_size]) */ struct jffs2_eraseblock *nextblock; /* The block we're currently filling */ struct jffs2_eraseblock *gcblock; /* The block we're currently garbage-collecting */ struct list_head clean_list; /* Blocks 100% full of clean data */ + struct list_head very_dirty_list; /* Blocks with lots of dirty space */ struct list_head dirty_list; /* Blocks with some dirty space */ + struct list_head erasable_list; /* Blocks which are completely dirty, and need erasing */ + struct list_head erasable_pending_wbuf_list; /* Blocks which need erasing but only after the current wbuf is flushed */ struct list_head erasing_list; /* Blocks which are currently erasing */ - struct list_head erase_pending_list; /* Blocks which need erasing */ + struct list_head erase_pending_list; /* Blocks which need erasing now */ struct list_head erase_complete_list; /* Blocks which are erased and need the clean marker written to them */ struct list_head free_list; /* Blocks which are free and ready to be used */ struct list_head bad_list; /* Bad blocks. */ struct list_head bad_used_list; /* Bad blocks with valid data in. */ - spinlock_t erase_completion_lock; /* Protect free_list and erasing_list + spinlock_t erase_completion_lock; /* Protect free_list and erasing_list against erase completion handler */ wait_queue_head_t erase_wait; /* For waiting for erases to complete */ - struct jffs2_inode_cache *inocache_list[INOCACHE_HASHSIZE]; + + wait_queue_head_t inocache_wq; + struct jffs2_inode_cache **inocache_list; spinlock_t inocache_lock; -}; -#ifdef JFFS2_OUT_OF_KERNEL -#define JFFS2_SB_INFO(sb) ((struct jffs2_sb_info *) &(sb)->u) -#else -#define JFFS2_SB_INFO(sb) (&sb->u.jffs2_sb) + /* Sem to allow jffs2_garbage_collect_deletion_dirent to + drop the erase_completion_lock while it's holding a pointer + to an obsoleted node. I don't like this. Alternatives welcomed. */ + struct semaphore erase_free_sem; + + uint32_t wbuf_pagesize; /* 0 for NOR and other flashes with no wbuf */ + +#ifdef CONFIG_JFFS2_FS_WRITEBUFFER + /* Write-behind buffer for NAND flash */ + unsigned char *wbuf; + uint32_t wbuf_ofs; + uint32_t wbuf_len; + struct jffs2_inodirty *wbuf_inodes; + + struct rw_semaphore wbuf_sem; /* Protects the write buffer */ + + /* Information about out-of-band area usage... */ + struct nand_oobinfo *oobinfo; + uint32_t badblock_pos; + uint32_t fsdata_pos; + uint32_t fsdata_len; #endif -#define OFNI_BS_2SFFJ(c) ((struct super_block *) ( ((char *)c) - ((char *)(&((struct super_block *)NULL)->u)) ) ) + struct jffs2_summary *summary; /* Summary information */ + + uint32_t ebh_size; /* This is the space size occupied by eraseblock_header on flash */ + + uint32_t total_erase_count; /* The summary erase count of all erase blocks */ + uint32_t nr_blocks_with_ebh; /* The number of erase blocks, which has eraseblock header on it */ + uint32_t max_erase_count; /* The maximum erase count of all erase blocks */ + + uint32_t used_blocks_current_index; + uint32_t free_blocks_current_index; + struct jffs2_blocks_bucket used_blocks[HASH_SIZE]; /* The hash table for both dirty and clean erase blocks */ + struct jffs2_blocks_bucket free_blocks[HASH_SIZE]; /* The hash table for free erase blocks */ + + /* OS-private pointer for getting back to master superblock info */ + void *os_priv; +}; #endif /* _JFFS2_FB_SB */ |