diff options
Diffstat (limited to 'fs/jffs2/jffs2_fs_sb.h')
| -rw-r--r-- | fs/jffs2/jffs2_fs_sb.h | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/fs/jffs2/jffs2_fs_sb.h b/fs/jffs2/jffs2_fs_sb.h new file mode 100644 index 000000000..046fee8b6 --- /dev/null +++ b/fs/jffs2/jffs2_fs_sb.h @@ -0,0 +1,162 @@ +/* + * 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 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 */ + + 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 */ |