| /* |
| * 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; |
| }; |
| |
| /* 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 checked_ino; |
| |
| 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 */ |
| int wbuf_queued; /* non-zero delayed work is queued */ |
| spinlock_t wbuf_dwork_lock; /* protects wbuf_dwork and and wbuf_queued */ |
| |
| 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 */ |