cregit-Linux how code gets into the kernel

Release 4.11 fs/jffs2/nodelist.h

Directory: fs/jffs2
 * 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 <linux/fs.h>
#include <linux/types.h>
#include <linux/jffs2.h>
#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"
#include "os-linux.h"


/* 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)))
#error wibble

/* 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;

uint32_t __totlen; /* This may die; use ref_totlen(c, jeb, ) below */

#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; }


David Woodhouse57100.00%2100.00%

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); }


David Woodhouse37100.00%1100.00%

/* 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[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 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); }


Ferenc Havasi37100.00%1100.00%

#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); } }


David Woodhouse6394.03%150.00%
Andrew Morton45.97%150.00%

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); }


David Woodhouse3172.09%133.33%
Artem B. Bityutskiy920.93%133.33%
Akinobu Mita36.98%133.33%

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); }


Artem B. Bityutskiy3172.09%133.33%
David Woodhouse920.93%133.33%
Akinobu Mita36.98%133.33%

#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__ */

Overall Contributors

David Woodhouse122357.74%3363.46%
Linus Torvalds62029.27%11.92%
Artem B. Bityutskiy974.58%611.54%
KaiGai Kohei773.64%23.85%
Ferenc Havasi743.49%23.85%
Thomas Gleixner60.28%11.92%
Akinobu Mita60.28%11.92%
Daniel Drake50.24%11.92%
Andrew Morton40.19%11.92%
Eric Paris30.14%11.92%
Andrew Victor10.05%11.92%
Ajesh Kunhipurayil Vijayan10.05%11.92%
Joakim Tjernlund10.05%11.92%
Directory: fs/jffs2
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.