164 lines
5.7 KiB
C
164 lines
5.7 KiB
C
/*
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* JFFS2 -- Journalling Flash File System, Version 2.
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*
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* Copyright © 2001-2007 Red Hat, Inc.
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* Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
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*
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* Created by David Woodhouse <dwmw2@infradead.org>
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*
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* For licensing information, see the file 'LICENCE' in this directory.
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*
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*/
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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 <linux/mutex.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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struct jffs2_mount_opts {
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bool override_compr;
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unsigned int compr;
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/* The size of the reserved pool. The reserved pool is the JFFS2 flash
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* space which may only be used by root cannot be used by the other
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* users. This is implemented simply by means of not allowing the
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* latter users to write to the file system if the amount if the
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* available space is less then 'rp_size'. */
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bool set_rp_size;
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unsigned int rp_size;
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};
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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 check_ino; /* *NEXT* inode to be checked */
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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 mutex 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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/* Number of 'very dirty' blocks before we trigger immediate GC */
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uint8_t vdirty_blocks_gctrigger;
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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_checking_list; /* Blocks which are being checked and marked */
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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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int inocache_hashsize;
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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 mutex erase_free_sem;
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uint32_t wbuf_pagesize; /* 0 for NOR and other flashes with no wbuf */
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#ifdef CONFIG_JFFS2_FS_WBUF_VERIFY
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unsigned char *wbuf_verify; /* read-back buffer for verification */
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#endif
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#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
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unsigned char *wbuf; /* Write-behind buffer for NAND flash */
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uint32_t wbuf_ofs;
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uint32_t wbuf_len;
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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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struct delayed_work wbuf_dwork; /* write-buffer write-out work */
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unsigned char *oobbuf;
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int oobavail; /* How many bytes are available for JFFS2 in OOB */
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#endif
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struct jffs2_summary *summary; /* Summary information */
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struct jffs2_mount_opts mount_opts;
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#ifdef CONFIG_JFFS2_FS_XATTR
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#define XATTRINDEX_HASHSIZE (57)
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uint32_t highest_xid;
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uint32_t highest_xseqno;
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struct list_head xattrindex[XATTRINDEX_HASHSIZE];
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struct list_head xattr_unchecked;
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struct list_head xattr_dead_list;
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struct jffs2_xattr_ref *xref_dead_list;
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struct jffs2_xattr_ref *xref_temp;
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struct rw_semaphore xattr_sem;
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uint32_t xdatum_mem_usage;
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uint32_t xdatum_mem_threshold;
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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_FS_SB */
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