120 lines
4.1 KiB
C
120 lines
4.1 KiB
C
/* $Id: jffs2_fs_sb.h,v 1.52 2005/05/19 16:12:17 gleixner Exp $ */
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#ifndef _JFFS2_FS_SB
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#define _JFFS2_FS_SB
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#include <linux/types.h>
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#include <linux/spinlock.h>
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#include <linux/workqueue.h>
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#include <linux/completion.h>
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#include <asm/semaphore.h>
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#include <linux/timer.h>
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#include <linux/wait.h>
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#include <linux/list.h>
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#include <linux/rwsem.h>
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#define JFFS2_SB_FLAG_RO 1
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#define JFFS2_SB_FLAG_SCANNING 2 /* Flash scanning is in progress */
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#define JFFS2_SB_FLAG_BUILDING 4 /* File system building is in progress */
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struct jffs2_inodirty;
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/* A struct for the overall file system control. Pointers to
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jffs2_sb_info structs are named `c' in the source code.
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Nee jffs_control
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*/
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struct jffs2_sb_info {
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struct mtd_info *mtd;
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uint32_t highest_ino;
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uint32_t checked_ino;
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unsigned int flags;
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struct task_struct *gc_task; /* GC task struct */
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struct completion gc_thread_start; /* GC thread start completion */
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struct completion gc_thread_exit; /* GC thread exit completion port */
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struct semaphore alloc_sem; /* Used to protect all the following
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fields, and also to protect against
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out-of-order writing of nodes. And GC. */
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uint32_t cleanmarker_size; /* Size of an _inline_ CLEANMARKER
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(i.e. zero for OOB CLEANMARKER */
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uint32_t flash_size;
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uint32_t used_size;
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uint32_t dirty_size;
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uint32_t wasted_size;
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uint32_t free_size;
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uint32_t erasing_size;
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uint32_t bad_size;
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uint32_t sector_size;
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uint32_t unchecked_size;
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uint32_t nr_free_blocks;
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uint32_t nr_erasing_blocks;
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/* Number of free blocks there must be before we... */
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uint8_t resv_blocks_write; /* ... allow a normal filesystem write */
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uint8_t resv_blocks_deletion; /* ... allow a normal filesystem deletion */
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uint8_t resv_blocks_gctrigger; /* ... wake up the GC thread */
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uint8_t resv_blocks_gcbad; /* ... pick a block from the bad_list to GC */
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uint8_t resv_blocks_gcmerge; /* ... merge pages when garbage collecting */
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uint32_t nospc_dirty_size;
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uint32_t nr_blocks;
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struct jffs2_eraseblock *blocks; /* The whole array of blocks. Used for getting blocks
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* from the offset (blocks[ofs / sector_size]) */
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struct jffs2_eraseblock *nextblock; /* The block we're currently filling */
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struct jffs2_eraseblock *gcblock; /* The block we're currently garbage-collecting */
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struct list_head clean_list; /* Blocks 100% full of clean data */
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struct list_head very_dirty_list; /* Blocks with lots of dirty space */
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struct list_head dirty_list; /* Blocks with some dirty space */
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struct list_head erasable_list; /* Blocks which are completely dirty, and need erasing */
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struct list_head erasable_pending_wbuf_list; /* Blocks which need erasing but only after the current wbuf is flushed */
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struct list_head erasing_list; /* Blocks which are currently erasing */
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struct list_head erase_pending_list; /* Blocks which need erasing now */
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struct list_head erase_complete_list; /* Blocks which are erased and need the clean marker written to them */
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struct list_head free_list; /* Blocks which are free and ready to be used */
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struct list_head bad_list; /* Bad blocks. */
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struct list_head bad_used_list; /* Bad blocks with valid data in. */
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spinlock_t erase_completion_lock; /* Protect free_list and erasing_list
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against erase completion handler */
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wait_queue_head_t erase_wait; /* For waiting for erases to complete */
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wait_queue_head_t inocache_wq;
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struct jffs2_inode_cache **inocache_list;
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spinlock_t inocache_lock;
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/* Sem to allow jffs2_garbage_collect_deletion_dirent to
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drop the erase_completion_lock while it's holding a pointer
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to an obsoleted node. I don't like this. Alternatives welcomed. */
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struct semaphore erase_free_sem;
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#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
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/* Write-behind buffer for NAND flash */
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unsigned char *wbuf;
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uint32_t wbuf_ofs;
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uint32_t wbuf_len;
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uint32_t wbuf_pagesize;
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struct jffs2_inodirty *wbuf_inodes;
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struct rw_semaphore wbuf_sem; /* Protects the write buffer */
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/* Information about out-of-band area usage... */
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struct nand_oobinfo *oobinfo;
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uint32_t badblock_pos;
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uint32_t fsdata_pos;
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uint32_t fsdata_len;
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#endif
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/* OS-private pointer for getting back to master superblock info */
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void *os_priv;
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};
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#endif /* _JFFS2_FB_SB */
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