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- /*
- * JFFS2 -- Journalling Flash File System, Version 2.
- *
- * Copyright © 2001-2007 Red Hat, Inc.
- * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
- *
- * Created by David Woodhouse <dwmw2@infradead.org>
- *
- * For licensing information, see the file 'LICENCE' in this directory.
- *
- */
- #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 <linux/mutex.h>
- #include <linux/timer.h>
- #include <linux/wait.h>
- #include <linux/list.h>
- #include <linux/rwsem.h>
- #define JFFS2_SB_FLAG_RO 1
- #define JFFS2_SB_FLAG_SCANNING 2 /* Flash scanning is in progress */
- #define JFFS2_SB_FLAG_BUILDING 4 /* File system building is in progress */
- struct jffs2_inodirty;
- struct jffs2_mount_opts {
- bool override_compr;
- unsigned int compr;
- /* The size of the reserved pool. The reserved pool is the JFFS2 flash
- * space which may only be used by root cannot be used by the other
- * users. This is implemented simply by means of not allowing the
- * latter users to write to the file system if the amount if the
- * available space is less then 'rp_size'. */
- unsigned int rp_size;
- };
- /* A struct for the overall file system control. Pointers to
- jffs2_sb_info structs are named `c' in the source code.
- Nee jffs_control
- */
- struct jffs2_sb_info {
- struct mtd_info *mtd;
- uint32_t highest_ino;
- uint32_t check_ino; /* *NEXT* inode to be checked */
- unsigned int flags;
- struct task_struct *gc_task; /* GC task struct */
- struct completion gc_thread_start; /* GC thread start completion */
- struct completion gc_thread_exit; /* GC thread exit completion port */
- struct mutex alloc_sem; /* Used to protect all the following
- fields, and also to protect against
- 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 */
- /* Number of 'very dirty' blocks before we trigger immediate GC */
- uint8_t vdirty_blocks_gctrigger;
- 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_checking_list; /* Blocks which are being checked and marked */
- 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
- against erase completion handler */
- wait_queue_head_t erase_wait; /* For waiting for erases to complete */
- wait_queue_head_t inocache_wq;
- int inocache_hashsize;
- struct jffs2_inode_cache **inocache_list;
- spinlock_t inocache_lock;
- /* 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 mutex erase_free_sem;
- uint32_t wbuf_pagesize; /* 0 for NOR and other flashes with no wbuf */
- #ifdef CONFIG_JFFS2_FS_WBUF_VERIFY
- unsigned char *wbuf_verify; /* read-back buffer for verification */
- #endif
- #ifdef CONFIG_JFFS2_FS_WRITEBUFFER
- unsigned char *wbuf; /* Write-behind buffer for NAND flash */
- uint32_t wbuf_ofs;
- uint32_t wbuf_len;
- struct jffs2_inodirty *wbuf_inodes;
- struct rw_semaphore wbuf_sem; /* Protects the write buffer */
- struct delayed_work wbuf_dwork; /* write-buffer write-out work */
- unsigned char *oobbuf;
- int oobavail; /* How many bytes are available for JFFS2 in OOB */
- #endif
- struct jffs2_summary *summary; /* Summary information */
- struct jffs2_mount_opts mount_opts;
- #ifdef CONFIG_JFFS2_FS_XATTR
- #define XATTRINDEX_HASHSIZE (57)
- uint32_t highest_xid;
- uint32_t highest_xseqno;
- struct list_head xattrindex[XATTRINDEX_HASHSIZE];
- struct list_head xattr_unchecked;
- struct list_head xattr_dead_list;
- struct jffs2_xattr_ref *xref_dead_list;
- struct jffs2_xattr_ref *xref_temp;
- struct rw_semaphore xattr_sem;
- uint32_t xdatum_mem_usage;
- uint32_t xdatum_mem_threshold;
- #endif
- /* OS-private pointer for getting back to master superblock info */
- void *os_priv;
- };
- #endif /* _JFFS2_FS_SB */
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