From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- fs/jffs2/nodelist.h | 484 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 484 insertions(+) create mode 100644 fs/jffs2/nodelist.h (limited to 'fs/jffs2/nodelist.h') diff --git a/fs/jffs2/nodelist.h b/fs/jffs2/nodelist.h new file mode 100644 index 000000000..2e98fa277 --- /dev/null +++ b/fs/jffs2/nodelist.h @@ -0,0 +1,484 @@ +/* + * JFFS2 -- Journalling Flash File System, Version 2. + * + * Copyright © 2001-2007 Red Hat, Inc. + * + * Created by David Woodhouse + * + * For licensing information, see the file 'LICENCE' in this directory. + * + */ + +#ifndef __JFFS2_NODELIST_H__ +#define __JFFS2_NODELIST_H__ + +#include +#include +#include +#include "jffs2_fs_sb.h" +#include "jffs2_fs_i.h" +#include "xattr.h" +#include "acl.h" +#include "summary.h" + +#ifdef __ECOS +#include "os-ecos.h" +#else +#include "os-linux.h" +#endif + +#define JFFS2_NATIVE_ENDIAN + +/* Note we handle mode bits conversion from JFFS2 (i.e. Linux) to/from + whatever OS we're actually running on here too. */ + +#if defined(JFFS2_NATIVE_ENDIAN) +#define cpu_to_je16(x) ((jint16_t){x}) +#define cpu_to_je32(x) ((jint32_t){x}) +#define cpu_to_jemode(x) ((jmode_t){os_to_jffs2_mode(x)}) + +#define constant_cpu_to_je16(x) ((jint16_t){x}) +#define constant_cpu_to_je32(x) ((jint32_t){x}) + +#define je16_to_cpu(x) ((x).v16) +#define je32_to_cpu(x) ((x).v32) +#define jemode_to_cpu(x) (jffs2_to_os_mode((x).m)) +#elif defined(JFFS2_BIG_ENDIAN) +#define cpu_to_je16(x) ((jint16_t){cpu_to_be16(x)}) +#define cpu_to_je32(x) ((jint32_t){cpu_to_be32(x)}) +#define cpu_to_jemode(x) ((jmode_t){cpu_to_be32(os_to_jffs2_mode(x))}) + +#define constant_cpu_to_je16(x) ((jint16_t){__constant_cpu_to_be16(x)}) +#define constant_cpu_to_je32(x) ((jint32_t){__constant_cpu_to_be32(x)}) + +#define je16_to_cpu(x) (be16_to_cpu(x.v16)) +#define je32_to_cpu(x) (be32_to_cpu(x.v32)) +#define jemode_to_cpu(x) (be32_to_cpu(jffs2_to_os_mode((x).m))) +#elif defined(JFFS2_LITTLE_ENDIAN) +#define cpu_to_je16(x) ((jint16_t){cpu_to_le16(x)}) +#define cpu_to_je32(x) ((jint32_t){cpu_to_le32(x)}) +#define cpu_to_jemode(x) ((jmode_t){cpu_to_le32(os_to_jffs2_mode(x))}) + +#define constant_cpu_to_je16(x) ((jint16_t){__constant_cpu_to_le16(x)}) +#define constant_cpu_to_je32(x) ((jint32_t){__constant_cpu_to_le32(x)}) + +#define je16_to_cpu(x) (le16_to_cpu(x.v16)) +#define je32_to_cpu(x) (le32_to_cpu(x.v32)) +#define jemode_to_cpu(x) (le32_to_cpu(jffs2_to_os_mode((x).m))) +#else +#error wibble +#endif + +/* The minimal node header size */ +#define JFFS2_MIN_NODE_HEADER sizeof(struct jffs2_raw_dirent) + +/* + 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 object. If this _is_ the last, it points to the inode_cache, + xattr_ref or xattr_datum instead. The common part of those structures + has NULL in the first word. See jffs2_raw_ref_to_ic() below */ + uint32_t flash_offset; +#undef TEST_TOTLEN +#ifdef TEST_TOTLEN + uint32_t __totlen; /* This may die; use ref_totlen(c, jeb, ) below */ +#endif +}; + +#define REF_LINK_NODE ((int32_t)-1) +#define REF_EMPTY_NODE ((int32_t)-2) + +/* Use blocks of about 256 bytes */ +#define REFS_PER_BLOCK ((255/sizeof(struct jffs2_raw_node_ref))-1) + +static inline struct jffs2_raw_node_ref *ref_next(struct jffs2_raw_node_ref *ref) +{ + ref++; + + /* Link to another block of refs */ + if (ref->flash_offset == REF_LINK_NODE) { + ref = ref->next_in_ino; + if (!ref) + return ref; + } + + /* End of chain */ + if (ref->flash_offset == REF_EMPTY_NODE) + return NULL; + + return ref; +} + +static inline struct jffs2_inode_cache *jffs2_raw_ref_to_ic(struct jffs2_raw_node_ref *raw) +{ + while(raw->next_in_ino) + raw = raw->next_in_ino; + + /* NB. This can be a jffs2_xattr_datum or jffs2_xattr_ref and + not actually a jffs2_inode_cache. Check ->class */ + return ((struct jffs2_inode_cache *)raw); +} + + /* 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, which indicate the node's status; see below: */ +#define REF_UNCHECKED 0 /* We haven't yet checked the CRC or built its inode */ +#define REF_OBSOLETE 1 /* Obsolete, can be completely ignored */ +#define REF_PRISTINE 2 /* Completely clean. GC without looking */ +#define REF_NORMAL 3 /* Possibly overlapped. Read the page and write again on GC */ +#define ref_flags(ref) ((ref)->flash_offset & 3) +#define ref_offset(ref) ((ref)->flash_offset & ~3) +#define ref_obsolete(ref) (((ref)->flash_offset & 3) == REF_OBSOLETE) +#define mark_ref_normal(ref) do { (ref)->flash_offset = ref_offset(ref) | REF_NORMAL; } while(0) + +/* Dirent nodes should be REF_PRISTINE only if they are not a deletion + dirent. Deletion dirents should be REF_NORMAL so that GC gets to + throw them away when appropriate */ +#define dirent_node_state(rd) ( (je32_to_cpu((rd)->ino)?REF_PRISTINE:REF_NORMAL) ) + +/* NB: REF_PRISTINE for an inode-less node (ref->next_in_ino == NULL) indicates + it is an unknown node of type JFFS2_NODETYPE_RWCOMPAT_COPY, so it'll get + copied. If you need to do anything different to GC inode-less nodes, then + you need to modify gc.c accordingly. */ + +/* 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 { + /* First part of structure is shared with other objects which + can terminate the raw node refs' next_in_ino list -- which + currently struct jffs2_xattr_datum and struct jffs2_xattr_ref. */ + + struct jffs2_full_dirent *scan_dents; /* Used during scan to hold + temporary lists of dirents, and later must be set to + NULL to mark the end of the raw_node_ref->next_in_ino + chain. */ + struct jffs2_raw_node_ref *nodes; + uint8_t class; /* It's used for identification */ + + /* end of shared structure */ + + uint8_t flags; + uint16_t state; + uint32_t ino; + struct jffs2_inode_cache *next; +#ifdef CONFIG_JFFS2_FS_XATTR + struct jffs2_xattr_ref *xref; +#endif + uint32_t pino_nlink; /* Directories store parent inode + here; other inodes store nlink. + Zero always means that it's + completely unlinked. */ +}; + +/* Inode states for 'state' above. We need the 'GC' state to prevent + someone from doing a read_inode() while we're moving a 'REF_PRISTINE' + node without going through all the iget() nonsense */ +#define INO_STATE_UNCHECKED 0 /* CRC checks not yet done */ +#define INO_STATE_CHECKING 1 /* CRC checks in progress */ +#define INO_STATE_PRESENT 2 /* In core */ +#define INO_STATE_CHECKEDABSENT 3 /* Checked, cleared again */ +#define INO_STATE_GC 4 /* GCing a 'pristine' node */ +#define INO_STATE_READING 5 /* In read_inode() */ +#define INO_STATE_CLEARING 6 /* In clear_inode() */ + +#define INO_FLAGS_XATTR_CHECKED 0x01 /* has no duplicate xattr_ref */ +#define INO_FLAGS_IS_DIR 0x02 /* is a directory */ + +#define RAWNODE_CLASS_INODE_CACHE 0 +#define RAWNODE_CLASS_XATTR_DATUM 1 +#define RAWNODE_CLASS_XATTR_REF 2 + +#define INOCACHE_HASHSIZE_MIN 128 +#define INOCACHE_HASHSIZE_MAX 1024 + +#define write_ofs(c) ((c)->nextblock->offset + (c)->sector_size - (c)->nextblock->free_size) + +/* + 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; + uint32_t ofs; /* The offset to which the data of this node belongs */ + uint32_t size; + uint32_t 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 rb_node rb; + struct jffs2_full_dnode *fn; + uint32_t version; + uint32_t data_crc; + uint32_t partial_crc; + uint32_t csize; + uint16_t overlapped; +}; + +/* Temporary data structure used during readinode. */ +struct jffs2_readinode_info +{ + struct rb_root tn_root; + struct jffs2_tmp_dnode_info *mdata_tn; + uint32_t highest_version; + uint32_t latest_mctime; + uint32_t mctime_ver; + struct jffs2_full_dirent *fds; + struct jffs2_raw_node_ref *latest_ref; +}; + +struct jffs2_full_dirent +{ + union { + struct jffs2_raw_node_ref *raw; + struct jffs2_inode_cache *ic; /* Just during part of build */ + }; + struct jffs2_full_dirent *next; + uint32_t version; + uint32_t ino; /* == zero for unlink */ + unsigned int nhash; + unsigned char type; + unsigned char name[]; +}; + +/* + 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 rb_node rb; + struct jffs2_full_dnode *node; /* NULL for holes */ + uint32_t size; + uint32_t ofs; /* The offset to which this fragment belongs */ +}; + +struct jffs2_eraseblock +{ + struct list_head list; + int bad_count; + uint32_t offset; /* of this block in the MTD */ + + uint32_t unchecked_size; + uint32_t used_size; + uint32_t dirty_size; + uint32_t wasted_size; + uint32_t free_size; /* Note that sector_size - free_size + is the address of the first free space */ + uint32_t allocated_refs; + 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 */ +}; + +static inline int jffs2_blocks_use_vmalloc(struct jffs2_sb_info *c) +{ + return ((c->flash_size / c->sector_size) * sizeof (struct jffs2_eraseblock)) > (128 * 1024); +} + +#define ref_totlen(a, b, c) __jffs2_ref_totlen((a), (b), (c)) + +#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 ALLOC_NORETRY 3 /* For jffs2_write_dnode: On failure, return -EAGAIN instead of retrying */ + +/* How much dirty space before it goes on the very_dirty_list */ +#define VERYDIRTY(c, size) ((size) >= ((c)->sector_size / 2)) + +/* check if dirty space is more than 255 Byte */ +#define ISDIRTY(size) ((size) > sizeof (struct jffs2_raw_inode) + JFFS2_MIN_DATA_LEN) + +#define PAD(x) (((x)+3)&~3) + +static inline int jffs2_encode_dev(union jffs2_device_node *jdev, dev_t rdev) +{ + if (old_valid_dev(rdev)) { + jdev->old_id = cpu_to_je16(old_encode_dev(rdev)); + return sizeof(jdev->old_id); + } else { + jdev->new_id = cpu_to_je32(new_encode_dev(rdev)); + return sizeof(jdev->new_id); + } +} + +static inline struct jffs2_node_frag *frag_first(struct rb_root *root) +{ + struct rb_node *node = rb_first(root); + + if (!node) + return NULL; + + return rb_entry(node, struct jffs2_node_frag, rb); +} + +static inline struct jffs2_node_frag *frag_last(struct rb_root *root) +{ + struct rb_node *node = rb_last(root); + + if (!node) + return NULL; + + return rb_entry(node, struct jffs2_node_frag, rb); +} + +#define frag_next(frag) rb_entry(rb_next(&(frag)->rb), struct jffs2_node_frag, rb) +#define frag_prev(frag) rb_entry(rb_prev(&(frag)->rb), struct jffs2_node_frag, rb) +#define frag_parent(frag) rb_entry(rb_parent(&(frag)->rb), struct jffs2_node_frag, rb) +#define frag_left(frag) rb_entry((frag)->rb.rb_left, struct jffs2_node_frag, rb) +#define frag_right(frag) rb_entry((frag)->rb.rb_right, struct jffs2_node_frag, rb) +#define frag_erase(frag, list) rb_erase(&frag->rb, list) + +#define tn_next(tn) rb_entry(rb_next(&(tn)->rb), struct jffs2_tmp_dnode_info, rb) +#define tn_prev(tn) rb_entry(rb_prev(&(tn)->rb), struct jffs2_tmp_dnode_info, rb) +#define tn_parent(tn) rb_entry(rb_parent(&(tn)->rb), struct jffs2_tmp_dnode_info, rb) +#define tn_left(tn) rb_entry((tn)->rb.rb_left, struct jffs2_tmp_dnode_info, rb) +#define tn_right(tn) rb_entry((tn)->rb.rb_right, struct jffs2_tmp_dnode_info, rb) +#define tn_erase(tn, list) rb_erase(&tn->rb, list) +#define tn_last(list) rb_entry(rb_last(list), struct jffs2_tmp_dnode_info, rb) +#define tn_first(list) rb_entry(rb_first(list), struct jffs2_tmp_dnode_info, rb) + +/* nodelist.c */ +void jffs2_add_fd_to_list(struct jffs2_sb_info *c, struct jffs2_full_dirent *new, struct jffs2_full_dirent **list); +void jffs2_set_inocache_state(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, int state); +struct jffs2_inode_cache *jffs2_get_ino_cache(struct jffs2_sb_info *c, uint32_t 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); +struct jffs2_node_frag *jffs2_lookup_node_frag(struct rb_root *fragtree, uint32_t offset); +void jffs2_kill_fragtree(struct rb_root *root, struct jffs2_sb_info *c_delete); +int jffs2_add_full_dnode_to_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_full_dnode *fn); +uint32_t jffs2_truncate_fragtree (struct jffs2_sb_info *c, struct rb_root *list, uint32_t size); +struct jffs2_raw_node_ref *jffs2_link_node_ref(struct jffs2_sb_info *c, + struct jffs2_eraseblock *jeb, + uint32_t ofs, uint32_t len, + struct jffs2_inode_cache *ic); +extern uint32_t __jffs2_ref_totlen(struct jffs2_sb_info *c, + struct jffs2_eraseblock *jeb, + struct jffs2_raw_node_ref *ref); + +/* nodemgmt.c */ +int jffs2_thread_should_wake(struct jffs2_sb_info *c); +int jffs2_reserve_space(struct jffs2_sb_info *c, uint32_t minsize, + uint32_t *len, int prio, uint32_t sumsize); +int jffs2_reserve_space_gc(struct jffs2_sb_info *c, uint32_t minsize, + uint32_t *len, uint32_t sumsize); +struct jffs2_raw_node_ref *jffs2_add_physical_node_ref(struct jffs2_sb_info *c, + uint32_t ofs, uint32_t len, + struct jffs2_inode_cache *ic); +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 */ +int jffs2_do_new_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, uint32_t mode, struct jffs2_raw_inode *ri); + +struct jffs2_full_dnode *jffs2_write_dnode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, + struct jffs2_raw_inode *ri, const unsigned char *data, + uint32_t datalen, int alloc_mode); +struct jffs2_full_dirent *jffs2_write_dirent(struct jffs2_sb_info *c, struct jffs2_inode_info *f, + struct jffs2_raw_dirent *rd, const unsigned char *name, + uint32_t namelen, int alloc_mode); +int jffs2_write_inode_range(struct jffs2_sb_info *c, struct jffs2_inode_info *f, + struct jffs2_raw_inode *ri, unsigned char *buf, + uint32_t offset, uint32_t writelen, uint32_t *retlen); +int jffs2_do_create(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, struct jffs2_inode_info *f, + struct jffs2_raw_inode *ri, const struct qstr *qstr); +int jffs2_do_unlink(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, const char *name, + int namelen, struct jffs2_inode_info *dead_f, uint32_t time); +int jffs2_do_link(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, uint32_t ino, + uint8_t type, const char *name, int namelen, uint32_t time); + + +/* readinode.c */ +int jffs2_do_read_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, + uint32_t ino, struct jffs2_raw_inode *latest_node); +int jffs2_do_crccheck_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic); +void jffs2_do_clear_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f); + +/* malloc.c */ +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 *); +int jffs2_prealloc_raw_node_refs(struct jffs2_sb_info *c, + struct jffs2_eraseblock *jeb, int nr); +void jffs2_free_refblock(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 *); +#ifdef CONFIG_JFFS2_FS_XATTR +struct jffs2_xattr_datum *jffs2_alloc_xattr_datum(void); +void jffs2_free_xattr_datum(struct jffs2_xattr_datum *); +struct jffs2_xattr_ref *jffs2_alloc_xattr_ref(void); +void jffs2_free_xattr_ref(struct jffs2_xattr_ref *); +#endif + +/* gc.c */ +int jffs2_garbage_collect_pass(struct jffs2_sb_info *c); + +/* read.c */ +int jffs2_read_dnode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, + struct jffs2_full_dnode *fd, unsigned char *buf, + int ofs, int len); +int jffs2_read_inode_range(struct jffs2_sb_info *c, struct jffs2_inode_info *f, + unsigned char *buf, uint32_t offset, uint32_t len); +char *jffs2_getlink(struct jffs2_sb_info *c, struct jffs2_inode_info *f); + +/* scan.c */ +int jffs2_scan_medium(struct jffs2_sb_info *c); +void jffs2_rotate_lists(struct jffs2_sb_info *c); +struct jffs2_inode_cache *jffs2_scan_make_ino_cache(struct jffs2_sb_info *c, uint32_t ino); +int jffs2_scan_classify_jeb(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb); +int jffs2_scan_dirty_space(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t size); + +/* build.c */ +int jffs2_do_mount_fs(struct jffs2_sb_info *c); + +/* erase.c */ +int jffs2_erase_pending_blocks(struct jffs2_sb_info *c, int count); +void jffs2_free_jeb_node_refs(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb); + +#ifdef CONFIG_JFFS2_FS_WRITEBUFFER +/* wbuf.c */ +int jffs2_flush_wbuf_gc(struct jffs2_sb_info *c, uint32_t ino); +int jffs2_flush_wbuf_pad(struct jffs2_sb_info *c); +int jffs2_check_nand_cleanmarker(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb); +int jffs2_write_nand_cleanmarker(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb); +#endif + +#include "debug.h" + +#endif /* __JFFS2_NODELIST_H__ */ -- cgit v1.2.3