/* * JFFS2 -- Journalling Flash File System, Version 2. * * Copyright (C) 2001 Red Hat, Inc. * * Created by David Woodhouse * * The original JFFS, from which the design for JFFS2 was derived, * was designed and implemented by Axis Communications AB. * * The contents of this file are subject to the Red Hat eCos Public * License Version 1.1 (the "Licence"); you may not use this file * except in compliance with the Licence. You may obtain a copy of * the Licence at http://www.redhat.com/ * * Software distributed under the Licence is distributed on an "AS IS" * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. * See the Licence for the specific language governing rights and * limitations under the Licence. * * The Original Code is JFFS2 - Journalling Flash File System, version 2 * * Alternatively, the contents of this file may be used under the * terms of the GNU General Public License version 2 (the "GPL"), in * which case the provisions of the GPL are applicable instead of the * above. If you wish to allow the use of your version of this file * only under the terms of the GPL and not to allow others to use your * version of this file under the RHEPL, indicate your decision by * deleting the provisions above and replace them with the notice and * other provisions required by the GPL. If you do not delete the * provisions above, a recipient may use your version of this file * under either the RHEPL or the GPL. * * $Id: nodelist.h,v 1.46 2001/09/18 23:43:05 dwmw2 Exp $ * */ #include #include #include #include #ifndef CONFIG_JFFS2_FS_DEBUG #define CONFIG_JFFS2_FS_DEBUG 2 #endif #if CONFIG_JFFS2_FS_DEBUG > 0 #define D1(x) x #else #define D1(x) #endif #if CONFIG_JFFS2_FS_DEBUG > 1 #define D2(x) x #else #define D2(x) #endif /* This is all we need to keep in-core for each raw node during normal operation. As and when we do read_inode on a particular inode, we can scan the nodes which are listed for it and build up a proper map of which nodes are currently valid. JFFSv1 always used to keep that whole map in core for each inode. */ struct jffs2_raw_node_ref { struct jffs2_raw_node_ref *next_in_ino; /* Points to the next raw_node_ref for this inode. If this is the last, it points to the inode_cache for this inode instead. The inode_cache will have NULL in the first word so you know when you've got there :) */ struct jffs2_raw_node_ref *next_phys; // __u32 ino; __u32 flash_offset; __u32 totlen; // __u16 nodetype; /* flash_offset & 3 always has to be zero, because nodes are always aligned at 4 bytes. So we have a couple of extra bits to play with. So we set the least significant bit to 1 to signify that the node is obsoleted by later nodes. */ }; /* Used for keeping track of deletion nodes &c, which can only be marked as obsolete when the node which they mark as deleted has actually been removed from the flash. */ struct jffs2_raw_node_ref_list { struct jffs2_raw_node_ref *rew; struct jffs2_raw_node_ref_list *next; }; /* For each inode in the filesystem, we need to keep a record of nlink, because it would be a PITA to scan the whole directory tree at read_inode() time to calculate it, and to keep sufficient information in the raw_node_ref (basically both parent and child inode number for dirent nodes) would take more space than this does. We also keep a pointer to the first physical node which is part of this inode, too. */ struct jffs2_inode_cache { struct jffs2_scan_info *scan; /* Used during scan to hold temporary lists of nodes, and later must be set to NULL to mark the end of the raw_node_ref->next_in_ino chain. */ struct jffs2_inode_cache *next; struct jffs2_raw_node_ref *nodes; __u32 ino; int nlink; }; struct jffs2_scan_info { struct jffs2_full_dirent *dents; struct jffs2_tmp_dnode_info *tmpnodes; }; /* Larger representation of a raw node, kept in-core only when the struct inode for this particular ino is instantiated. */ struct jffs2_full_dnode { struct jffs2_raw_node_ref *raw; __u32 ofs; /* Don't really need this, but optimisation */ __u32 size; __u32 frags; /* Number of fragments which currently refer to this node. When this reaches zero, the node is obsolete. */ }; /* Even larger representation of a raw node, kept in-core only while we're actually building up the original map of which nodes go where, in read_inode() */ struct jffs2_tmp_dnode_info { struct jffs2_tmp_dnode_info *next; struct jffs2_full_dnode *fn; __u32 version; }; struct jffs2_full_dirent { struct jffs2_raw_node_ref *raw; struct jffs2_full_dirent *next; __u32 version; __u32 ino; /* == zero for unlink */ unsigned int nhash; unsigned char type; unsigned char name[0]; }; /* Fragments - used to build a map of which raw node to obtain data from for each part of the ino */ struct jffs2_node_frag { struct jffs2_node_frag *next; struct jffs2_full_dnode *node; /* NULL for holes */ __u32 size; __u32 ofs; /* Don't really need this, but optimisation */ __u32 node_ofs; /* offset within the physical node */ }; struct jffs2_eraseblock { struct list_head list; int bad_count; __u32 offset; /* of this block in the MTD */ __u32 used_size; __u32 dirty_size; __u32 free_size; /* Note that sector_size - free_size is the address of the first free space */ struct jffs2_raw_node_ref *first_node; struct jffs2_raw_node_ref *last_node; struct jffs2_raw_node_ref *gc_node; /* Next node to be garbage collected */ /* For deletia. When a dirent node in this eraseblock is deleted by a node elsewhere, that other node can only be marked as obsolete when this block is actually erased. So we keep a list of the nodes to mark as obsolete when the erase is completed. */ // MAYBE struct jffs2_raw_node_ref_list *deletia; }; #define ACCT_SANITY_CHECK(c, jeb) do { \ if (jeb->used_size + jeb->dirty_size + jeb->free_size != c->sector_size) { \ printk(KERN_NOTICE "Eeep. Space accounting for block at 0x%08x is screwed\n", jeb->offset); \ printk(KERN_NOTICE "free 0x%08x + dirty 0x%08x + used %08x != total %08x\n", \ jeb->free_size, jeb->dirty_size, jeb->used_size, c->sector_size); \ BUG(); \ } \ if (c->used_size + c->dirty_size + c->free_size + c->erasing_size + c->bad_size != c->flash_size) { \ printk(KERN_NOTICE "Eeep. Space accounting superblock info is screwed\n"); \ printk(KERN_NOTICE "free 0x%08x + dirty 0x%08x + used %08x + erasing %08x + bad %08x != total %08x\n", \ c->free_size, c->dirty_size, c->used_size, c->erasing_size, c->bad_size, c->flash_size); \ BUG(); \ } \ } while(0) #define ACCT_PARANOIA_CHECK(jeb) do { \ __u32 my_used_size = 0; \ struct jffs2_raw_node_ref *ref2 = jeb->first_node; \ while (ref2) { \ if (!(ref2->flash_offset & 1)) \ my_used_size += ref2->totlen; \ ref2 = ref2->next_phys; \ } \ if (my_used_size != jeb->used_size) { \ printk(KERN_NOTICE "Calculated used size %08x != stored used size %08x\n", my_used_size, jeb->used_size); \ BUG(); \ } \ } while(0) #define ALLOC_NORMAL 0 /* Normal allocation */ #define ALLOC_DELETION 1 /* Deletion node. Best to allow it */ #define ALLOC_GC 2 /* Space requested for GC. Give it or die */ #define JFFS2_RESERVED_BLOCKS_BASE 3 /* Number of free blocks there must be before we... */ #define JFFS2_RESERVED_BLOCKS_WRITE (JFFS2_RESERVED_BLOCKS_BASE + 2) /* ... allow a normal filesystem write */ #define JFFS2_RESERVED_BLOCKS_DELETION (JFFS2_RESERVED_BLOCKS_BASE + 1) /* ... allow a normal filesystem deletion */ #define JFFS2_RESERVED_BLOCKS_GCTRIGGER (JFFS2_RESERVED_BLOCKS_BASE + 3) /* ... wake up the GC thread */ #define JFFS2_RESERVED_BLOCKS_GCBAD (JFFS2_RESERVED_BLOCKS_BASE + 1) /* ... pick a block from the bad_list to GC */ #define JFFS2_RESERVED_BLOCKS_GCMERGE (JFFS2_RESERVED_BLOCKS_BASE) /* ... merge pages when garbage collecting */ #define PAD(x) (((x)+3)&~3) static inline int jffs2_raw_ref_to_inum(struct jffs2_raw_node_ref *raw) { while(raw->next_in_ino) { raw = raw->next_in_ino; } return ((struct jffs2_inode_cache *)raw)->ino; } /* nodelist.c */ D1(void jffs2_print_frag_list(struct jffs2_inode_info *f)); void jffs2_add_fd_to_list(struct jffs2_sb_info *c, struct jffs2_full_dirent *new, struct jffs2_full_dirent **list); void jffs2_add_tn_to_list(struct jffs2_tmp_dnode_info *tn, struct jffs2_tmp_dnode_info **list); int jffs2_get_inode_nodes(struct jffs2_sb_info *c, ino_t ino, struct jffs2_inode_info *f, struct jffs2_tmp_dnode_info **tnp, struct jffs2_full_dirent **fdp, __u32 *highest_version); struct jffs2_inode_cache *jffs2_get_ino_cache(struct jffs2_sb_info *c, int ino); void jffs2_add_ino_cache (struct jffs2_sb_info *c, struct jffs2_inode_cache *new); void jffs2_del_ino_cache(struct jffs2_sb_info *c, struct jffs2_inode_cache *old); void jffs2_free_ino_caches(struct jffs2_sb_info *c); void jffs2_free_raw_node_refs(struct jffs2_sb_info *c); /* nodemgmt.c */ int jffs2_reserve_space(struct jffs2_sb_info *c, __u32 minsize, __u32 *ofs, __u32 *len, int prio); int jffs2_reserve_space_gc(struct jffs2_sb_info *c, __u32 minsize, __u32 *ofs, __u32 *len); int jffs2_add_physical_node_ref(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *new, __u32 len, int dirty); void jffs2_complete_reservation(struct jffs2_sb_info *c); void jffs2_mark_node_obsolete(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *raw); /* write.c */ struct inode *jffs2_new_inode (struct inode *dir_i, int mode, struct jffs2_raw_inode *ri); struct jffs2_full_dnode *jffs2_write_dnode(struct inode *inode, struct jffs2_raw_inode *ri, const unsigned char *data, __u32 datalen, __u32 flash_ofs, __u32 *writelen); struct jffs2_full_dirent *jffs2_write_dirent(struct inode *inode, struct jffs2_raw_dirent *rd, const unsigned char *name, __u32 namelen, __u32 flash_ofs, __u32 *writelen); /* readinode.c */ void jffs2_truncate_fraglist (struct jffs2_sb_info *c, struct jffs2_node_frag **list, __u32 size); int jffs2_add_full_dnode_to_fraglist(struct jffs2_sb_info *c, struct jffs2_node_frag **list, struct jffs2_full_dnode *fn); int jffs2_add_full_dnode_to_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_full_dnode *fn); void jffs2_read_inode (struct inode *); void jffs2_clear_inode (struct inode *); /* malloc.c */ void jffs2_free_tmp_dnode_info_list(struct jffs2_tmp_dnode_info *tn); void jffs2_free_full_dirent_list(struct jffs2_full_dirent *fd); int jffs2_create_slab_caches(void); void jffs2_destroy_slab_caches(void); struct jffs2_full_dirent *jffs2_alloc_full_dirent(int namesize); void jffs2_free_full_dirent(struct jffs2_full_dirent *); struct jffs2_full_dnode *jffs2_alloc_full_dnode(void); void jffs2_free_full_dnode(struct jffs2_full_dnode *); struct jffs2_raw_dirent *jffs2_alloc_raw_dirent(void); void jffs2_free_raw_dirent(struct jffs2_raw_dirent *); struct jffs2_raw_inode *jffs2_alloc_raw_inode(void); void jffs2_free_raw_inode(struct jffs2_raw_inode *); struct jffs2_tmp_dnode_info *jffs2_alloc_tmp_dnode_info(void); void jffs2_free_tmp_dnode_info(struct jffs2_tmp_dnode_info *); struct jffs2_raw_node_ref *jffs2_alloc_raw_node_ref(void); void jffs2_free_raw_node_ref(struct jffs2_raw_node_ref *); struct jffs2_node_frag *jffs2_alloc_node_frag(void); void jffs2_free_node_frag(struct jffs2_node_frag *); struct jffs2_inode_cache *jffs2_alloc_inode_cache(void); void jffs2_free_inode_cache(struct jffs2_inode_cache *); /* gc.c */ int jffs2_garbage_collect_pass(struct jffs2_sb_info *c); /* background.c */ int jffs2_start_garbage_collect_thread(struct jffs2_sb_info *c); void jffs2_stop_garbage_collect_thread(struct jffs2_sb_info *c); void jffs2_garbage_collect_trigger(struct jffs2_sb_info *c); /* dir.c */ extern struct file_operations jffs2_dir_operations; extern struct inode_operations jffs2_dir_inode_operations; /* file.c */ extern struct file_operations jffs2_file_operations; extern struct inode_operations jffs2_file_inode_operations; extern struct address_space_operations jffs2_file_address_operations; int jffs2_null_fsync(struct file *, struct dentry *, int); int jffs2_setattr (struct dentry *dentry, struct iattr *iattr); int jffs2_do_readpage_nolock (struct inode *inode, struct page *pg); int jffs2_do_readpage_unlock (struct inode *inode, struct page *pg); int jffs2_readpage (struct file *, struct page *); int jffs2_prepare_write (struct file *, struct page *, unsigned, unsigned); int jffs2_commit_write (struct file *, struct page *, unsigned, unsigned); /* ioctl.c */ int jffs2_ioctl(struct inode *, struct file *, unsigned int, unsigned long); /* read.c */ int jffs2_read_dnode(struct jffs2_sb_info *c, struct jffs2_full_dnode *fd, unsigned char *buf, int ofs, int len); /* compr.c */ unsigned char jffs2_compress(unsigned char *data_in, unsigned char *cpage_out, __u32 *datalen, __u32 *cdatalen); int jffs2_decompress(unsigned char comprtype, unsigned char *cdata_in, unsigned char *data_out, __u32 cdatalen, __u32 datalen); /* scan.c */ int jffs2_scan_medium(struct jffs2_sb_info *c); /* build.c */ int jffs2_build_filesystem(struct jffs2_sb_info *c); /* symlink.c */ extern struct inode_operations jffs2_symlink_inode_operations; /* erase.c */ void jffs2_erase_block(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb); void jffs2_erase_pending_blocks(struct jffs2_sb_info *c); void jffs2_mark_erased_blocks(struct jffs2_sb_info *c); void jffs2_erase_pending_trigger(struct jffs2_sb_info *c);