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e631ddba58
The goal of summary is to speed up the mount time. Erase block summary (EBS) stores summary information at the end of every (closed) erase block. It is no longer necessary to scan all nodes separetly (and read all pages of them) just read this "small" summary, where every information is stored which is needed at mount time. This summary information is stored in a JFFS2_FEATURE_RWCOMPAT_DELETE. During the mount process if there is no summary info the orignal scan process will be executed. EBS works with NAND and NOR flashes, too. There is a user space tool called sumtool to generate this summary information for a JFFS2 image. Signed-off-by: Ferenc Havasi <havasi@inf.u-szeged.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
121 lines
4.2 KiB
C
121 lines
4.2 KiB
C
/* $Id: jffs2_fs_sb.h,v 1.53 2005/09/07 08:34:56 havasi 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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struct jffs2_summary *summary; /* Summary information */
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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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