reiserfs_fs.h
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上传日期:2013-02-24
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- /*
- * Copyright 1996, 1997, 1998 Hans Reiser, see reiserfs/README for licensing and copyright details
- */
- /* this file has an amazingly stupid
- name, yura please fix it to be
- reiserfs.h, and merge all the rest
- of our .h files that are in this
- directory into it. */
- #ifndef _LINUX_REISER_FS_H
- #define _LINUX_REISER_FS_H
- #include <linux/types.h>
- #ifdef __KERNEL__
- #include <linux/slab.h>
- #include <linux/tqueue.h>
- #include <asm/unaligned.h>
- #include <linux/bitops.h>
- #include <asm/hardirq.h>
- #include <linux/proc_fs.h>
- #endif
- /*
- * include/linux/reiser_fs.h
- *
- * Reiser File System constants and structures
- *
- */
- /* in reading the #defines, it may help to understand that they employ
- the following abbreviations:
- B = Buffer
- I = Item header
- H = Height within the tree (should be changed to LEV)
- N = Number of the item in the node
- STAT = stat data
- DEH = Directory Entry Header
- EC = Entry Count
- E = Entry number
- UL = Unsigned Long
- BLKH = BLocK Header
- UNFM = UNForMatted node
- DC = Disk Child
- P = Path
- These #defines are named by concatenating these abbreviations,
- where first comes the arguments, and last comes the return value,
- of the macro.
- */
- #define USE_INODE_GENERATION_COUNTER
- #define REISERFS_PREALLOCATE
- #define PREALLOCATION_SIZE 8
- /* n must be power of 2 */
- #define _ROUND_UP(x,n) (((x)+(n)-1u) & ~((n)-1u))
- // to be ok for alpha and others we have to align structures to 8 byte
- // boundary.
- // FIXME: do not change 4 by anything else: there is code which relies on that
- #define ROUND_UP(x) _ROUND_UP(x,8LL)
- /* debug levels. Right now, CONFIG_REISERFS_CHECK means print all debug
- ** messages.
- */
- #define REISERFS_DEBUG_CODE 5 /* extra messages to help find/debug errors */
- /* assertions handling */
- /** always check a condition and panic if it's false. */
- #define RASSERT( cond, format, args... )
- if( !( cond ) )
- reiserfs_panic( 0, "reiserfs[%i]: assertion " #cond " failed at "
- __FILE__ ":%i:" __FUNCTION__ ": " format "n",
- in_interrupt() ? -1 : current -> pid, __LINE__ , ##args )
- #if defined( CONFIG_REISERFS_CHECK )
- #define RFALSE( cond, format, args... ) RASSERT( !( cond ), format, ##args )
- #else
- #define RFALSE( cond, format, args... ) do {;} while( 0 )
- #endif
- #define CONSTF __attribute__( ( const ) )
- /*
- * Disk Data Structures
- */
- /***************************************************************************/
- /* SUPER BLOCK */
- /***************************************************************************/
- /*
- * Structure of super block on disk, a version of which in RAM is often accessed as s->u.reiserfs_sb.s_rs
- * the version in RAM is part of a larger structure containing fields never written to disk.
- */
- /* used by gcc */
- #define REISERFS_SUPER_MAGIC 0x52654973
- /* used by file system utilities that
- look at the superblock, etc. */
- #define REISERFS_SUPER_MAGIC_STRING "ReIsErFs"
- #define REISER2FS_SUPER_MAGIC_STRING "ReIsEr2Fs"
- extern char reiserfs_super_magic_string[];
- extern char reiser2fs_super_magic_string[];
- static inline int is_reiserfs_magic_string (const struct reiserfs_super_block * rs)
- {
- return (!strncmp (rs->s_magic, reiserfs_super_magic_string,
- strlen ( reiserfs_super_magic_string)) ||
- !strncmp (rs->s_magic, reiser2fs_super_magic_string,
- strlen ( reiser2fs_super_magic_string)));
- }
- /* ReiserFS leaves the first 64k unused, so that partition labels have
- enough space. If someone wants to write a fancy bootloader that
- needs more than 64k, let us know, and this will be increased in size.
- This number must be larger than than the largest block size on any
- platform, or code will break. -Hans */
- #define REISERFS_DISK_OFFSET_IN_BYTES (64 * 1024)
- #define REISERFS_FIRST_BLOCK unused_define
- /* the spot for the super in versions 3.5 - 3.5.10 (inclusive) */
- #define REISERFS_OLD_DISK_OFFSET_IN_BYTES (8 * 1024)
- // reiserfs internal error code (used by search_by_key adn fix_nodes))
- #define CARRY_ON 0
- #define REPEAT_SEARCH -1
- #define IO_ERROR -2
- #define NO_DISK_SPACE -3
- #define NO_BALANCING_NEEDED (-4)
- #define NO_MORE_UNUSED_CONTIGUOUS_BLOCKS (-5)
- typedef unsigned long b_blocknr_t;
- typedef __u32 unp_t;
- struct unfm_nodeinfo {
- unp_t unfm_nodenum;
- unsigned short unfm_freespace;
- };
- /* there are two formats of keys: 3.5 and 3.6
- */
- #define KEY_FORMAT_3_5 0
- #define KEY_FORMAT_3_6 1
- /* there are two stat datas */
- #define STAT_DATA_V1 0
- #define STAT_DATA_V2 1
- /** this says about version of key of all items (but stat data) the
- object consists of */
- #define get_inode_item_key_version( inode )
- (((inode)->u.reiserfs_i.i_flags & i_item_key_version_mask) ? KEY_FORMAT_3_6 : KEY_FORMAT_3_5)
- #define set_inode_item_key_version( inode, version )
- ({ if((version)==KEY_FORMAT_3_6)
- (inode)->u.reiserfs_i.i_flags |= i_item_key_version_mask;
- else
- (inode)->u.reiserfs_i.i_flags &= ~i_item_key_version_mask; })
- #define get_inode_sd_version(inode)
- (((inode)->u.reiserfs_i.i_flags & i_stat_data_version_mask) ? STAT_DATA_V2 : STAT_DATA_V1)
- #define set_inode_sd_version(inode, version)
- ({ if((version)==STAT_DATA_V2)
- (inode)->u.reiserfs_i.i_flags |= i_stat_data_version_mask;
- else
- (inode)->u.reiserfs_i.i_flags &= ~i_stat_data_version_mask; })
- /* This is an aggressive tail suppression policy, I am hoping it
- improves our benchmarks. The principle behind it is that percentage
- space saving is what matters, not absolute space saving. This is
- non-intuitive, but it helps to understand it if you consider that the
- cost to access 4 blocks is not much more than the cost to access 1
- block, if you have to do a seek and rotate. A tail risks a
- non-linear disk access that is significant as a percentage of total
- time cost for a 4 block file and saves an amount of space that is
- less significant as a percentage of space, or so goes the hypothesis.
- -Hans */
- #define STORE_TAIL_IN_UNFM(n_file_size,n_tail_size,n_block_size)
- (
- (!(n_tail_size)) ||
- (((n_tail_size) > MAX_DIRECT_ITEM_LEN(n_block_size)) ||
- ( (n_file_size) >= (n_block_size) * 4 ) ||
- ( ( (n_file_size) >= (n_block_size) * 3 ) &&
- ( (n_tail_size) >= (MAX_DIRECT_ITEM_LEN(n_block_size))/4) ) ||
- ( ( (n_file_size) >= (n_block_size) * 2 ) &&
- ( (n_tail_size) >= (MAX_DIRECT_ITEM_LEN(n_block_size))/2) ) ||
- ( ( (n_file_size) >= (n_block_size) ) &&
- ( (n_tail_size) >= (MAX_DIRECT_ITEM_LEN(n_block_size) * 3)/4) ) )
- )
- /*
- * values for s_state field
- */
- #define REISERFS_VALID_FS 1
- #define REISERFS_ERROR_FS 2
- /***************************************************************************/
- /* KEY & ITEM HEAD */
- /***************************************************************************/
- //
- // directories use this key as well as old files
- //
- struct offset_v1 {
- __u32 k_offset;
- __u32 k_uniqueness;
- } __attribute__ ((__packed__));
- struct offset_v2 {
- #ifdef __LITTLE_ENDIAN
- /* little endian version */
- __u64 k_offset:60;
- __u64 k_type: 4;
- #else
- /* big endian version */
- __u64 k_type: 4;
- __u64 k_offset:60;
- #endif
- } __attribute__ ((__packed__));
- #ifndef __LITTLE_ENDIAN
- typedef union {
- struct offset_v2 offset_v2;
- __u64 linear;
- } __attribute__ ((__packed__)) offset_v2_esafe_overlay;
- static inline __u16 offset_v2_k_type( const struct offset_v2 *v2 )
- {
- offset_v2_esafe_overlay tmp = *(const offset_v2_esafe_overlay *)v2;
- tmp.linear = le64_to_cpu( tmp.linear );
- return tmp.offset_v2.k_type;
- }
-
- static inline void set_offset_v2_k_type( struct offset_v2 *v2, int type )
- {
- offset_v2_esafe_overlay *tmp = (offset_v2_esafe_overlay *)v2;
- tmp->linear = le64_to_cpu(tmp->linear);
- tmp->offset_v2.k_type = type;
- tmp->linear = cpu_to_le64(tmp->linear);
- }
-
- static inline loff_t offset_v2_k_offset( const struct offset_v2 *v2 )
- {
- offset_v2_esafe_overlay tmp = *(const offset_v2_esafe_overlay *)v2;
- tmp.linear = le64_to_cpu( tmp.linear );
- return tmp.offset_v2.k_offset;
- }
- static inline void set_offset_v2_k_offset( struct offset_v2 *v2, loff_t offset ){
- offset_v2_esafe_overlay *tmp = (offset_v2_esafe_overlay *)v2;
- tmp->linear = le64_to_cpu(tmp->linear);
- tmp->offset_v2.k_offset = offset;
- tmp->linear = cpu_to_le64(tmp->linear);
- }
- #else
- # define offset_v2_k_type(v2) ((v2)->k_type)
- # define set_offset_v2_k_type(v2,val) (offset_v2_k_type(v2) = (val))
- # define offset_v2_k_offset(v2) ((v2)->k_offset)
- # define set_offset_v2_k_offset(v2,val) (offset_v2_k_offset(v2) = (val))
- #endif
- /* Key of an item determines its location in the S+tree, and
- is composed of 4 components */
- struct key {
- __u32 k_dir_id; /* packing locality: by default parent
- directory object id */
- __u32 k_objectid; /* object identifier */
- union {
- struct offset_v1 k_offset_v1;
- struct offset_v2 k_offset_v2;
- } __attribute__ ((__packed__)) u;
- } __attribute__ ((__packed__));
- struct cpu_key {
- struct key on_disk_key;
- int version;
- int key_length; /* 3 in all cases but direct2indirect and
- indirect2direct conversion */
- };
- /* Our function for comparing keys can compare keys of different
- lengths. It takes as a parameter the length of the keys it is to
- compare. These defines are used in determining what is to be passed
- to it as that parameter. */
- #define REISERFS_FULL_KEY_LEN 4
- #define REISERFS_SHORT_KEY_LEN 2
- /* The result of the key compare */
- #define FIRST_GREATER 1
- #define SECOND_GREATER -1
- #define KEYS_IDENTICAL 0
- #define KEY_FOUND 1
- #define KEY_NOT_FOUND 0
- #define KEY_SIZE (sizeof(struct key))
- #define SHORT_KEY_SIZE (sizeof (__u32) + sizeof (__u32))
- /* return values for search_by_key and clones */
- #define ITEM_FOUND 1
- #define ITEM_NOT_FOUND 0
- #define ENTRY_FOUND 1
- #define ENTRY_NOT_FOUND 0
- #define DIRECTORY_NOT_FOUND -1
- #define REGULAR_FILE_FOUND -2
- #define DIRECTORY_FOUND -3
- #define BYTE_FOUND 1
- #define BYTE_NOT_FOUND 0
- #define FILE_NOT_FOUND -1
- #define POSITION_FOUND 1
- #define POSITION_NOT_FOUND 0
- // return values for reiserfs_find_entry and search_by_entry_key
- #define NAME_FOUND 1
- #define NAME_NOT_FOUND 0
- #define GOTO_PREVIOUS_ITEM 2
- #define NAME_FOUND_INVISIBLE 3
- /* Everything in the filesystem is stored as a set of items. The
- item head contains the key of the item, its free space (for
- indirect items) and specifies the location of the item itself
- within the block. */
- struct item_head
- {
- /* Everything in the tree is found by searching for it based on
- * its key.*/
- struct key ih_key;
- union {
- /* The free space in the last unformatted node of an
- indirect item if this is an indirect item. This
- equals 0xFFFF iff this is a direct item or stat data
- item. Note that the key, not this field, is used to
- determine the item type, and thus which field this
- union contains. */
- __u16 ih_free_space_reserved;
- /* Iff this is a directory item, this field equals the
- number of directory entries in the directory item. */
- __u16 ih_entry_count;
- } __attribute__ ((__packed__)) u;
- __u16 ih_item_len; /* total size of the item body */
- __u16 ih_item_location; /* an offset to the item body
- * within the block */
- __u16 ih_version; /* 0 for all old items, 2 for new
- ones. Highest bit is set by fsck
- temporary, cleaned after all
- done */
- } __attribute__ ((__packed__));
- /* size of item header */
- #define IH_SIZE (sizeof(struct item_head))
- #define ih_free_space(ih) le16_to_cpu((ih)->u.ih_free_space_reserved)
- #define ih_version(ih) le16_to_cpu((ih)->ih_version)
- #define ih_entry_count(ih) le16_to_cpu((ih)->u.ih_entry_count)
- #define ih_location(ih) le16_to_cpu((ih)->ih_item_location)
- #define ih_item_len(ih) le16_to_cpu((ih)->ih_item_len)
- #define put_ih_free_space(ih, val) do { (ih)->u.ih_free_space_reserved = cpu_to_le16(val); } while(0)
- #define put_ih_version(ih, val) do { (ih)->ih_version = cpu_to_le16(val); } while (0)
- #define put_ih_entry_count(ih, val) do { (ih)->u.ih_entry_count = cpu_to_le16(val); } while (0)
- #define put_ih_location(ih, val) do { (ih)->ih_item_location = cpu_to_le16(val); } while (0)
- #define put_ih_item_len(ih, val) do { (ih)->ih_item_len = cpu_to_le16(val); } while (0)
- #define unreachable_item(ih) (ih_version(ih) & (1 << 15))
- #define get_ih_free_space(ih) (ih_version (ih) == KEY_FORMAT_3_6 ? 0 : ih_free_space (ih))
- #define set_ih_free_space(ih,val) put_ih_free_space((ih), ((ih_version(ih) == KEY_FORMAT_3_6) ? 0 : (val)))
- /* these operate on indirect items, where you've got an array of ints
- ** at a possibly unaligned location. These are a noop on ia32
- **
- ** p is the array of __u32, i is the index into the array, v is the value
- ** to store there.
- */
- #define get_block_num(p, i) le32_to_cpu(get_unaligned((p) + (i)))
- #define put_block_num(p, i, v) put_unaligned(cpu_to_le32(v), (p) + (i))
- //
- // there are 5 item types currently
- //
- #define TYPE_STAT_DATA 0
- #define TYPE_INDIRECT 1
- #define TYPE_DIRECT 2
- #define TYPE_DIRENTRY 3
- #define TYPE_ANY 15 // FIXME: comment is required
- //
- // in old version uniqueness field shows key type
- //
- #define V1_SD_UNIQUENESS 0
- #define V1_INDIRECT_UNIQUENESS 0xfffffffe
- #define V1_DIRECT_UNIQUENESS 0xffffffff
- #define V1_DIRENTRY_UNIQUENESS 500
- #define V1_ANY_UNIQUENESS 555 // FIXME: comment is required
- extern void reiserfs_warning (const char * fmt, ...);
- /* __attribute__( ( format ( printf, 1, 2 ) ) ); */
- //
- // here are conversion routines
- //
- static inline int uniqueness2type (__u32 uniqueness) CONSTF;
- static inline int uniqueness2type (__u32 uniqueness)
- {
- switch (uniqueness) {
- case V1_SD_UNIQUENESS: return TYPE_STAT_DATA;
- case V1_INDIRECT_UNIQUENESS: return TYPE_INDIRECT;
- case V1_DIRECT_UNIQUENESS: return TYPE_DIRECT;
- case V1_DIRENTRY_UNIQUENESS: return TYPE_DIRENTRY;
- default:
- reiserfs_warning( "vs-500: unknown uniqueness %dn", uniqueness);
- case V1_ANY_UNIQUENESS:
- return TYPE_ANY;
- }
- }
- static inline __u32 type2uniqueness (int type) CONSTF;
- static inline __u32 type2uniqueness (int type)
- {
- switch (type) {
- case TYPE_STAT_DATA: return V1_SD_UNIQUENESS;
- case TYPE_INDIRECT: return V1_INDIRECT_UNIQUENESS;
- case TYPE_DIRECT: return V1_DIRECT_UNIQUENESS;
- case TYPE_DIRENTRY: return V1_DIRENTRY_UNIQUENESS;
- default:
- reiserfs_warning( "vs-501: unknown type %dn", type);
- case TYPE_ANY:
- return V1_ANY_UNIQUENESS;
- }
- }
- //
- // key is pointer to on disk key which is stored in le, result is cpu,
- // there is no way to get version of object from key, so, provide
- // version to these defines
- //
- static inline loff_t le_key_k_offset (int version, const struct key * key)
- {
- return (version == KEY_FORMAT_3_5) ?
- le32_to_cpu( key->u.k_offset_v1.k_offset ) :
- offset_v2_k_offset( &(key->u.k_offset_v2) );
- }
- static inline loff_t le_ih_k_offset (const struct item_head * ih)
- {
- return le_key_k_offset (ih_version (ih), &(ih->ih_key));
- }
- static inline loff_t le_key_k_type (int version, const struct key * key)
- {
- return (version == KEY_FORMAT_3_5) ?
- uniqueness2type( le32_to_cpu( key->u.k_offset_v1.k_uniqueness)) :
- offset_v2_k_type( &(key->u.k_offset_v2) );
- }
- static inline loff_t le_ih_k_type (const struct item_head * ih)
- {
- return le_key_k_type (ih_version (ih), &(ih->ih_key));
- }
- static inline void set_le_key_k_offset (int version, struct key * key, loff_t offset)
- {
- (version == KEY_FORMAT_3_5) ?
- (key->u.k_offset_v1.k_offset = cpu_to_le32 (offset)) : /* jdm check */
- (set_offset_v2_k_offset( &(key->u.k_offset_v2), offset ));
- }
- static inline void set_le_ih_k_offset (struct item_head * ih, loff_t offset)
- {
- set_le_key_k_offset (ih_version (ih), &(ih->ih_key), offset);
- }
- static inline void set_le_key_k_type (int version, struct key * key, int type)
- {
- (version == KEY_FORMAT_3_5) ?
- (key->u.k_offset_v1.k_uniqueness = cpu_to_le32(type2uniqueness(type))):
- (set_offset_v2_k_type( &(key->u.k_offset_v2), type ));
- }
- static inline void set_le_ih_k_type (struct item_head * ih, int type)
- {
- set_le_key_k_type (ih_version (ih), &(ih->ih_key), type);
- }
- #define is_direntry_le_key(version,key) (le_key_k_type (version, key) == TYPE_DIRENTRY)
- #define is_direct_le_key(version,key) (le_key_k_type (version, key) == TYPE_DIRECT)
- #define is_indirect_le_key(version,key) (le_key_k_type (version, key) == TYPE_INDIRECT)
- #define is_statdata_le_key(version,key) (le_key_k_type (version, key) == TYPE_STAT_DATA)
- //
- // item header has version.
- //
- #define is_direntry_le_ih(ih) is_direntry_le_key (ih_version (ih), &((ih)->ih_key))
- #define is_direct_le_ih(ih) is_direct_le_key (ih_version (ih), &((ih)->ih_key))
- #define is_indirect_le_ih(ih) is_indirect_le_key (ih_version(ih), &((ih)->ih_key))
- #define is_statdata_le_ih(ih) is_statdata_le_key (ih_version (ih), &((ih)->ih_key))
- //
- // key is pointer to cpu key, result is cpu
- //
- static inline loff_t cpu_key_k_offset (const struct cpu_key * key)
- {
- return (key->version == KEY_FORMAT_3_5) ?
- key->on_disk_key.u.k_offset_v1.k_offset :
- key->on_disk_key.u.k_offset_v2.k_offset;
- }
- static inline loff_t cpu_key_k_type (const struct cpu_key * key)
- {
- return (key->version == KEY_FORMAT_3_5) ?
- uniqueness2type (key->on_disk_key.u.k_offset_v1.k_uniqueness) :
- key->on_disk_key.u.k_offset_v2.k_type;
- }
- static inline void set_cpu_key_k_offset (struct cpu_key * key, loff_t offset)
- {
- (key->version == KEY_FORMAT_3_5) ?
- (key->on_disk_key.u.k_offset_v1.k_offset = offset) :
- (key->on_disk_key.u.k_offset_v2.k_offset = offset);
- }
- static inline void set_cpu_key_k_type (struct cpu_key * key, int type)
- {
- (key->version == KEY_FORMAT_3_5) ?
- (key->on_disk_key.u.k_offset_v1.k_uniqueness = type2uniqueness (type)):
- (key->on_disk_key.u.k_offset_v2.k_type = type);
- }
- static inline void cpu_key_k_offset_dec (struct cpu_key * key)
- {
- if (key->version == KEY_FORMAT_3_5)
- key->on_disk_key.u.k_offset_v1.k_offset --;
- else
- key->on_disk_key.u.k_offset_v2.k_offset --;
- }
- #define is_direntry_cpu_key(key) (cpu_key_k_type (key) == TYPE_DIRENTRY)
- #define is_direct_cpu_key(key) (cpu_key_k_type (key) == TYPE_DIRECT)
- #define is_indirect_cpu_key(key) (cpu_key_k_type (key) == TYPE_INDIRECT)
- #define is_statdata_cpu_key(key) (cpu_key_k_type (key) == TYPE_STAT_DATA)
- /* are these used ? */
- #define is_direntry_cpu_ih(ih) (is_direntry_cpu_key (&((ih)->ih_key)))
- #define is_direct_cpu_ih(ih) (is_direct_cpu_key (&((ih)->ih_key)))
- #define is_indirect_cpu_ih(ih) (is_indirect_cpu_key (&((ih)->ih_key)))
- #define is_statdata_cpu_ih(ih) (is_statdata_cpu_key (&((ih)->ih_key)))
- #define I_K_KEY_IN_ITEM(p_s_ih, p_s_key, n_blocksize)
- ( ! COMP_SHORT_KEYS(p_s_ih, p_s_key) &&
- I_OFF_BYTE_IN_ITEM(p_s_ih, k_offset (p_s_key), n_blocksize) )
- /* maximal length of item */
- #define MAX_ITEM_LEN(block_size) (block_size - BLKH_SIZE - IH_SIZE)
- #define MIN_ITEM_LEN 1
- /* object identifier for root dir */
- #define REISERFS_ROOT_OBJECTID 2
- #define REISERFS_ROOT_PARENT_OBJECTID 1
- extern struct key root_key;
- /*
- * Picture represents a leaf of the S+tree
- * ______________________________________________________
- * | | Array of | | |
- * |Block | Object-Item | F r e e | Objects- |
- * | head | Headers | S p a c e | Items |
- * |______|_______________|___________________|___________|
- */
- /* Header of a disk block. More precisely, header of a formatted leaf
- or internal node, and not the header of an unformatted node. */
- struct block_head {
- __u16 blk_level; /* Level of a block in the tree. */
- __u16 blk_nr_item; /* Number of keys/items in a block. */
- __u16 blk_free_space; /* Block free space in bytes. */
- __u16 blk_reserved;
- /* dump this in v4/planA */
- struct key blk_right_delim_key; /* kept only for compatibility */
- };
- #define BLKH_SIZE (sizeof(struct block_head))
- #define blkh_level(p_blkh) (le16_to_cpu((p_blkh)->blk_level))
- #define blkh_nr_item(p_blkh) (le16_to_cpu((p_blkh)->blk_nr_item))
- #define blkh_free_space(p_blkh) (le16_to_cpu((p_blkh)->blk_free_space))
- #define blkh_reserved(p_blkh) (le16_to_cpu((p_blkh)->blk_reserved))
- #define set_blkh_level(p_blkh,val) ((p_blkh)->blk_level = cpu_to_le16(val))
- #define set_blkh_nr_item(p_blkh,val) ((p_blkh)->blk_nr_item = cpu_to_le16(val))
- #define set_blkh_free_space(p_blkh,val) ((p_blkh)->blk_free_space = cpu_to_le16(val))
- #define set_blkh_reserved(p_blkh,val) ((p_blkh)->blk_reserved = cpu_to_le16(val))
- #define blkh_right_delim_key(p_blkh) ((p_blkh)->blk_right_delim_key)
- #define set_blkh_right_delim_key(p_blkh,val) ((p_blkh)->blk_right_delim_key = val)
- /*
- * values for blk_level field of the struct block_head
- */
- #define FREE_LEVEL 0 /* when node gets removed from the tree its
- blk_level is set to FREE_LEVEL. It is then
- used to see whether the node is still in the
- tree */
- #define DISK_LEAF_NODE_LEVEL 1 /* Leaf node level.*/
- /* Given the buffer head of a formatted node, resolve to the block head of that node. */
- #define B_BLK_HEAD(p_s_bh) ((struct block_head *)((p_s_bh)->b_data))
- /* Number of items that are in buffer. */
- #define B_NR_ITEMS(p_s_bh) (blkh_nr_item(B_BLK_HEAD(p_s_bh)))
- #define B_LEVEL(p_s_bh) (blkh_level(B_BLK_HEAD(p_s_bh)))
- #define B_FREE_SPACE(p_s_bh) (blkh_free_space(B_BLK_HEAD(p_s_bh)))
- #define PUT_B_NR_ITEMS(p_s_bh,val) do { set_blkh_nr_item(B_BLK_HEAD(p_s_bh),val); } while (0)
- #define PUT_B_LEVEL(p_s_bh,val) do { set_blkh_level(B_BLK_HEAD(p_s_bh),val); } while (0)
- #define PUT_B_FREE_SPACE(p_s_bh,val) do { set_blkh_free_space(B_BLK_HEAD(p_s_bh),val); } while (0)
- /* Get right delimiting key. -- little endian */
- #define B_PRIGHT_DELIM_KEY(p_s_bh) (&(blk_right_delim_key(B_BLK_HEAD(p_s_bh))
- /* Does the buffer contain a disk leaf. */
- #define B_IS_ITEMS_LEVEL(p_s_bh) (B_LEVEL(p_s_bh) == DISK_LEAF_NODE_LEVEL)
- /* Does the buffer contain a disk internal node */
- #define B_IS_KEYS_LEVEL(p_s_bh) (B_LEVEL(p_s_bh) > DISK_LEAF_NODE_LEVEL
- && B_LEVEL(p_s_bh) <= MAX_HEIGHT)
- /***************************************************************************/
- /* STAT DATA */
- /***************************************************************************/
- //
- // old stat data is 32 bytes long. We are going to distinguish new one by
- // different size
- //
- struct stat_data_v1
- {
- __u16 sd_mode; /* file type, permissions */
- __u16 sd_nlink; /* number of hard links */
- __u16 sd_uid; /* owner */
- __u16 sd_gid; /* group */
- __u32 sd_size; /* file size */
- __u32 sd_atime; /* time of last access */
- __u32 sd_mtime; /* time file was last modified */
- __u32 sd_ctime; /* time inode (stat data) was last changed (except changes to sd_atime and sd_mtime) */
- union {
- __u32 sd_rdev;
- __u32 sd_blocks; /* number of blocks file uses */
- } __attribute__ ((__packed__)) u;
- __u32 sd_first_direct_byte; /* first byte of file which is stored
- in a direct item: except that if it
- equals 1 it is a symlink and if it
- equals ~(__u32)0 there is no
- direct item. The existence of this
- field really grates on me. Let's
- replace it with a macro based on
- sd_size and our tail suppression
- policy. Someday. -Hans */
- } __attribute__ ((__packed__));
- #define SD_V1_SIZE (sizeof(struct stat_data_v1))
- #define stat_data_v1(ih) (ih_version (ih) == KEY_FORMAT_3_5)
- #define sd_v1_mode(sdp) (le16_to_cpu((sdp)->sd_mode))
- #define set_sd_v1_mode(sdp,v) ((sdp)->sd_mode = cpu_to_le16(v))
- #define sd_v1_nlink(sdp) (le16_to_cpu((sdp)->sd_nlink))
- #define set_sd_v1_nlink(sdp,v) ((sdp)->sd_nlink = cpu_to_le16(v))
- #define sd_v1_uid(sdp) (le16_to_cpu((sdp)->sd_uid))
- #define set_sd_v1_uid(sdp,v) ((sdp)->sd_uid = cpu_to_le16(v))
- #define sd_v1_gid(sdp) (le16_to_cpu((sdp)->sd_gid))
- #define set_sd_v1_gid(sdp,v) ((sdp)->sd_gid = cpu_to_le16(v))
- #define sd_v1_size(sdp) (le32_to_cpu((sdp)->sd_size))
- #define set_sd_v1_size(sdp,v) ((sdp)->sd_size = cpu_to_le32(v))
- #define sd_v1_atime(sdp) (le32_to_cpu((sdp)->sd_atime))
- #define set_sd_v1_atime(sdp,v) ((sdp)->sd_atime = cpu_to_le32(v))
- #define sd_v1_mtime(sdp) (le32_to_cpu((sdp)->sd_mtime))
- #define set_sd_v1_mtime(sdp,v) ((sdp)->sd_mtime = cpu_to_le32(v))
- #define sd_v1_ctime(sdp) (le32_to_cpu((sdp)->sd_ctime))
- #define set_sd_v1_ctime(sdp,v) ((sdp)->sd_ctime = cpu_to_le32(v))
- #define sd_v1_rdev(sdp) (le32_to_cpu((sdp)->u.sd_rdev))
- #define set_sd_v1_rdev(sdp,v) ((sdp)->u.sd_rdev = cpu_to_le32(v))
- #define sd_v1_blocks(sdp) (le32_to_cpu((sdp)->u.sd_blocks))
- #define set_sd_v1_blocks(sdp,v) ((sdp)->u.sd_blocks = cpu_to_le32(v))
- #define sd_v1_first_direct_byte(sdp)
- (le32_to_cpu((sdp)->sd_first_direct_byte))
- #define set_sd_v1_first_direct_byte(sdp,v)
- ((sdp)->sd_first_direct_byte = cpu_to_le32(v))
- /* Stat Data on disk (reiserfs version of UFS disk inode minus the
- address blocks) */
- struct stat_data {
- __u16 sd_mode; /* file type, permissions */
- __u16 sd_reserved;
- __u32 sd_nlink; /* number of hard links */
- __u64 sd_size; /* file size */
- __u32 sd_uid; /* owner */
- __u32 sd_gid; /* group */
- __u32 sd_atime; /* time of last access */
- __u32 sd_mtime; /* time file was last modified */
- __u32 sd_ctime; /* time inode (stat data) was last changed (except changes to sd_atime and sd_mtime) */
- __u32 sd_blocks;
- union {
- __u32 sd_rdev;
- __u32 sd_generation;
- //__u32 sd_first_direct_byte;
- /* first byte of file which is stored in a
- direct item: except that if it equals 1
- it is a symlink and if it equals
- ~(__u32)0 there is no direct item. The
- existence of this field really grates
- on me. Let's replace it with a macro
- based on sd_size and our tail
- suppression policy? */
- } __attribute__ ((__packed__)) u;
- } __attribute__ ((__packed__));
- //
- // this is 44 bytes long
- //
- #define SD_SIZE (sizeof(struct stat_data))
- #define SD_V2_SIZE SD_SIZE
- #define stat_data_v2(ih) (ih_version (ih) == KEY_FORMAT_3_6)
- #define sd_v2_mode(sdp) (le16_to_cpu((sdp)->sd_mode))
- #define set_sd_v2_mode(sdp,v) ((sdp)->sd_mode = cpu_to_le16(v))
- /* sd_reserved */
- /* set_sd_reserved */
- #define sd_v2_nlink(sdp) (le32_to_cpu((sdp)->sd_nlink))
- #define set_sd_v2_nlink(sdp,v) ((sdp)->sd_nlink = cpu_to_le32(v))
- #define sd_v2_size(sdp) (le64_to_cpu((sdp)->sd_size))
- #define set_sd_v2_size(sdp,v) ((sdp)->sd_size = cpu_to_le64(v))
- #define sd_v2_uid(sdp) (le32_to_cpu((sdp)->sd_uid))
- #define set_sd_v2_uid(sdp,v) ((sdp)->sd_uid = cpu_to_le32(v))
- #define sd_v2_gid(sdp) (le32_to_cpu((sdp)->sd_gid))
- #define set_sd_v2_gid(sdp,v) ((sdp)->sd_gid = cpu_to_le32(v))
- #define sd_v2_atime(sdp) (le32_to_cpu((sdp)->sd_atime))
- #define set_sd_v2_atime(sdp,v) ((sdp)->sd_atime = cpu_to_le32(v))
- #define sd_v2_mtime(sdp) (le32_to_cpu((sdp)->sd_mtime))
- #define set_sd_v2_mtime(sdp,v) ((sdp)->sd_mtime = cpu_to_le32(v))
- #define sd_v2_ctime(sdp) (le32_to_cpu((sdp)->sd_ctime))
- #define set_sd_v2_ctime(sdp,v) ((sdp)->sd_ctime = cpu_to_le32(v))
- #define sd_v2_blocks(sdp) (le32_to_cpu((sdp)->sd_blocks))
- #define set_sd_v2_blocks(sdp,v) ((sdp)->sd_blocks = cpu_to_le32(v))
- #define sd_v2_rdev(sdp) (le32_to_cpu((sdp)->u.sd_rdev))
- #define set_sd_v2_rdev(sdp,v) ((sdp)->u.sd_rdev = cpu_to_le32(v))
- #define sd_v2_generation(sdp) (le32_to_cpu((sdp)->u.sd_generation))
- #define set_sd_v2_generation(sdp,v) ((sdp)->u.sd_generation = cpu_to_le32(v))
- /***************************************************************************/
- /* DIRECTORY STRUCTURE */
- /***************************************************************************/
- /*
- Picture represents the structure of directory items
- ________________________________________________
- | Array of | | | | | |
- | directory |N-1| N-2 | .... | 1st |0th|
- | entry headers | | | | | |
- |_______________|___|_____|________|_______|___|
- <---- directory entries ------>
- First directory item has k_offset component 1. We store "." and ".."
- in one item, always, we never split "." and ".." into differing
- items. This makes, among other things, the code for removing
- directories simpler. */
- #define SD_OFFSET 0
- #define SD_UNIQUENESS 0
- #define DOT_OFFSET 1
- #define DOT_DOT_OFFSET 2
- #define DIRENTRY_UNIQUENESS 500
- /* */
- #define FIRST_ITEM_OFFSET 1
- /*
- Q: How to get key of object pointed to by entry from entry?
- A: Each directory entry has its header. This header has deh_dir_id and deh_objectid fields, those are key
- of object, entry points to */
- /* NOT IMPLEMENTED:
- Directory will someday contain stat data of object */
- struct reiserfs_de_head
- {
- __u32 deh_offset; /* third component of the directory entry key */
- __u32 deh_dir_id; /* objectid of the parent directory of the object, that is referenced
- by directory entry */
- __u32 deh_objectid; /* objectid of the object, that is referenced by directory entry */
- __u16 deh_location; /* offset of name in the whole item */
- __u16 deh_state; /* whether 1) entry contains stat data (for future), and 2) whether
- entry is hidden (unlinked) */
- } __attribute__ ((__packed__));
- #define DEH_SIZE sizeof(struct reiserfs_de_head)
- #define deh_offset(p_deh) (le32_to_cpu((p_deh)->deh_offset))
- #define deh_dir_id(p_deh) (le32_to_cpu((p_deh)->deh_dir_id))
- #define deh_objectid(p_deh) (le32_to_cpu((p_deh)->deh_objectid))
- #define deh_location(p_deh) (le16_to_cpu((p_deh)->deh_location))
- #define deh_state(p_deh) (le16_to_cpu((p_deh)->deh_state))
- #define put_deh_offset(p_deh,v) ((p_deh)->deh_offset = cpu_to_le32((v)))
- #define put_deh_dir_id(p_deh,v) ((p_deh)->deh_dir_id = cpu_to_le32((v)))
- #define put_deh_objectid(p_deh,v) ((p_deh)->deh_objectid = cpu_to_le32((v)))
- #define put_deh_location(p_deh,v) ((p_deh)->deh_location = cpu_to_le16((v)))
- #define put_deh_state(p_deh,v) ((p_deh)->deh_state = cpu_to_le16((v)))
- /* empty directory contains two entries "." and ".." and their headers */
- #define EMPTY_DIR_SIZE
- (DEH_SIZE * 2 + ROUND_UP (strlen (".")) + ROUND_UP (strlen ("..")))
- /* old format directories have this size when empty */
- #define EMPTY_DIR_SIZE_V1 (DEH_SIZE * 2 + 3)
- #define DEH_Statdata 0 /* not used now */
- #define DEH_Visible 2
- /* 64 bit systems (and the S/390) need to be aligned explicitly -jdm */
- #if BITS_PER_LONG == 64 || defined(__s390__) || defined(__hppa__)
- # define ADDR_UNALIGNED_BITS (3)
- #endif
- /* These are only used to manipulate deh_state.
- * Because of this, we'll use the ext2_ bit routines,
- * since they are little endian */
- #ifdef ADDR_UNALIGNED_BITS
- # define aligned_address(addr) ((void *)((long)(addr) & ~((1UL << ADDR_UNALIGNED_BITS) - 1)))
- # define unaligned_offset(addr) (((int)((long)(addr) & ((1 << ADDR_UNALIGNED_BITS) - 1))) << 3)
- # define set_bit_unaligned(nr, addr) ext2_set_bit((nr) + unaligned_offset(addr), aligned_address(addr))
- # define clear_bit_unaligned(nr, addr) ext2_clear_bit((nr) + unaligned_offset(addr), aligned_address(addr))
- # define test_bit_unaligned(nr, addr) ext2_test_bit((nr) + unaligned_offset(addr), aligned_address(addr))
- #else
- # define set_bit_unaligned(nr, addr) ext2_set_bit(nr, addr)
- # define clear_bit_unaligned(nr, addr) ext2_clear_bit(nr, addr)
- # define test_bit_unaligned(nr, addr) ext2_test_bit(nr, addr)
- #endif
- #define mark_de_with_sd(deh) set_bit_unaligned (DEH_Statdata, &((deh)->deh_state))
- #define mark_de_without_sd(deh) clear_bit_unaligned (DEH_Statdata, &((deh)->deh_state))
- #define mark_de_visible(deh) set_bit_unaligned (DEH_Visible, &((deh)->deh_state))
- #define mark_de_hidden(deh) clear_bit_unaligned (DEH_Visible, &((deh)->deh_state))
- #define de_with_sd(deh) test_bit_unaligned (DEH_Statdata, &((deh)->deh_state))
- #define de_visible(deh) test_bit_unaligned (DEH_Visible, &((deh)->deh_state))
- #define de_hidden(deh) !test_bit_unaligned (DEH_Visible, &((deh)->deh_state))
- extern void make_empty_dir_item_v1 (char * body, __u32 dirid, __u32 objid,
- __u32 par_dirid, __u32 par_objid);
- extern void make_empty_dir_item (char * body, __u32 dirid, __u32 objid,
- __u32 par_dirid, __u32 par_objid);
- /* array of the entry headers */
- /* get item body */
- #define B_I_PITEM(bh,ih) ( (bh)->b_data + ih_location(ih) )
- #define B_I_DEH(bh,ih) ((struct reiserfs_de_head *)(B_I_PITEM(bh,ih)))
- /* length of the directory entry in directory item. This define
- calculates length of i-th directory entry using directory entry
- locations from dir entry head. When it calculates length of 0-th
- directory entry, it uses length of whole item in place of entry
- location of the non-existent following entry in the calculation.
- See picture above.*/
- /*
- #define I_DEH_N_ENTRY_LENGTH(ih,deh,i)
- ((i) ? (deh_location((deh)-1) - deh_location((deh))) : (ih_item_len((ih)) - deh_location((deh))))
- */
- static inline int entry_length (const struct buffer_head * bh,
- const struct item_head * ih, int pos_in_item)
- {
- struct reiserfs_de_head * deh;
- deh = B_I_DEH (bh, ih) + pos_in_item;
- if (pos_in_item)
- return deh_location(deh-1) - deh_location(deh);
- return ih_item_len(ih) - deh_location(deh);
- }
- /* number of entries in the directory item, depends on ENTRY_COUNT being at the start of directory dynamic data. */
- #define I_ENTRY_COUNT(ih) (ih_entry_count((ih)))
- /* name by bh, ih and entry_num */
- #define B_I_E_NAME(bh,ih,entry_num) ((char *)(bh->b_data + ih_location(ih) + deh_location(B_I_DEH(bh,ih)+(entry_num))))
- // two entries per block (at least)
- //#define REISERFS_MAX_NAME_LEN(block_size)
- //((block_size - BLKH_SIZE - IH_SIZE - DEH_SIZE * 2) / 2)
- #define REISERFS_MAX_NAME_LEN(block_size) 255
- /* this structure is used for operations on directory entries. It is
- not a disk structure. */
- /* When reiserfs_find_entry or search_by_entry_key find directory
- entry, they return filled reiserfs_dir_entry structure */
- struct reiserfs_dir_entry
- {
- struct buffer_head * de_bh;
- int de_item_num;
- struct item_head * de_ih;
- int de_entry_num;
- struct reiserfs_de_head * de_deh;
- int de_entrylen;
- int de_namelen;
- char * de_name;
- char * de_gen_number_bit_string;
- __u32 de_dir_id;
- __u32 de_objectid;
- struct cpu_key de_entry_key;
- };
-
- /* these defines are useful when a particular member of a reiserfs_dir_entry is needed */
- /* pointer to file name, stored in entry */
- #define B_I_DEH_ENTRY_FILE_NAME(bh,ih,deh) (B_I_PITEM (bh, ih) + deh_location(deh))
- /* length of name */
- #define I_DEH_N_ENTRY_FILE_NAME_LENGTH(ih,deh,entry_num)
- (I_DEH_N_ENTRY_LENGTH (ih, deh, entry_num) - (de_with_sd (deh) ? SD_SIZE : 0))
- /* hash value occupies bits from 7 up to 30 */
- #define GET_HASH_VALUE(offset) ((offset) & 0x7fffff80LL)
- /* generation number occupies 7 bits starting from 0 up to 6 */
- #define GET_GENERATION_NUMBER(offset) ((offset) & 0x7fLL)
- #define MAX_GENERATION_NUMBER 127
- #define SET_GENERATION_NUMBER(offset,gen_number) (GET_HASH_VALUE(offset)|(gen_number))
- /*
- * Picture represents an internal node of the reiserfs tree
- * ______________________________________________________
- * | | Array of | Array of | Free |
- * |block | keys | pointers | space |
- * | head | N | N+1 | |
- * |______|_______________|___________________|___________|
- */
- /***************************************************************************/
- /* DISK CHILD */
- /***************************************************************************/
- /* Disk child pointer: The pointer from an internal node of the tree
- to a node that is on disk. */
- struct disk_child {
- __u32 dc_block_number; /* Disk child's block number. */
- __u16 dc_size; /* Disk child's used space. */
- __u16 dc_reserved;
- };
- #define DC_SIZE (sizeof(struct disk_child))
- #define dc_block_number(dc_p) (le32_to_cpu((dc_p)->dc_block_number))
- #define dc_size(dc_p) (le16_to_cpu((dc_p)->dc_size))
- #define put_dc_block_number(dc_p, val) do { (dc_p)->dc_block_number = cpu_to_le32(val); } while(0)
- #define put_dc_size(dc_p, val) do { (dc_p)->dc_size = cpu_to_le16(val); } while(0)
- /* Get disk child by buffer header and position in the tree node. */
- #define B_N_CHILD(p_s_bh,n_pos) ((struct disk_child *)
- ((p_s_bh)->b_data+BLKH_SIZE+B_NR_ITEMS(p_s_bh)*KEY_SIZE+DC_SIZE*(n_pos)))
- /* Get disk child number by buffer header and position in the tree node. */
- #define B_N_CHILD_NUM(p_s_bh,n_pos) (dc_block_number(B_N_CHILD(p_s_bh,n_pos)))
- #define PUT_B_N_CHILD_NUM(p_s_bh,n_pos, val) (put_dc_block_number(B_N_CHILD(p_s_bh,n_pos), val ))
- /* maximal value of field child_size in structure disk_child */
- /* child size is the combined size of all items and their headers */
- #define MAX_CHILD_SIZE(bh) ((int)( (bh)->b_size - BLKH_SIZE ))
- /* amount of used space in buffer (not including block head) */
- #define B_CHILD_SIZE(cur) (MAX_CHILD_SIZE(cur)-(B_FREE_SPACE(cur)))
- /* max and min number of keys in internal node */
- #define MAX_NR_KEY(bh) ( (MAX_CHILD_SIZE(bh)-DC_SIZE)/(KEY_SIZE+DC_SIZE) )
- #define MIN_NR_KEY(bh) (MAX_NR_KEY(bh)/2)
- /***************************************************************************/
- /* PATH STRUCTURES AND DEFINES */
- /***************************************************************************/
- /* Search_by_key fills up the path from the root to the leaf as it descends the tree looking for the
- key. It uses reiserfs_bread to try to find buffers in the cache given their block number. If it
- does not find them in the cache it reads them from disk. For each node search_by_key finds using
- reiserfs_bread it then uses bin_search to look through that node. bin_search will find the
- position of the block_number of the next node if it is looking through an internal node. If it
- is looking through a leaf node bin_search will find the position of the item which has key either
- equal to given key, or which is the maximal key less than the given key. */
- struct path_element {
- struct buffer_head * pe_buffer; /* Pointer to the buffer at the path in the tree. */
- int pe_position; /* Position in the tree node which is placed in the */
- /* buffer above. */
- };
- #define MAX_HEIGHT 5 /* maximal height of a tree. don't change this without changing JOURNAL_PER_BALANCE_CNT */
- #define EXTENDED_MAX_HEIGHT 7 /* Must be equals MAX_HEIGHT + FIRST_PATH_ELEMENT_OFFSET */
- #define FIRST_PATH_ELEMENT_OFFSET 2 /* Must be equal to at least 2. */
- #define ILLEGAL_PATH_ELEMENT_OFFSET 1 /* Must be equal to FIRST_PATH_ELEMENT_OFFSET - 1 */
- #define MAX_FEB_SIZE 6 /* this MUST be MAX_HEIGHT + 1. See about FEB below */
- /* We need to keep track of who the ancestors of nodes are. When we
- perform a search we record which nodes were visited while
- descending the tree looking for the node we searched for. This list
- of nodes is called the path. This information is used while
- performing balancing. Note that this path information may become
- invalid, and this means we must check it when using it to see if it
- is still valid. You'll need to read search_by_key and the comments
- in it, especially about decrement_counters_in_path(), to understand
- this structure.
- Paths make the code so much harder to work with and debug.... An
- enormous number of bugs are due to them, and trying to write or modify
- code that uses them just makes my head hurt. They are based on an
- excessive effort to avoid disturbing the precious VFS code.:-( The
- gods only know how we are going to SMP the code that uses them.
- znodes are the way! */
- struct path {
- int path_length; /* Length of the array above. */
- struct path_element path_elements[EXTENDED_MAX_HEIGHT]; /* Array of the path elements. */
- int pos_in_item;
- };
- #define pos_in_item(path) ((path)->pos_in_item)
- #define INITIALIZE_PATH(var)
- struct path var = {ILLEGAL_PATH_ELEMENT_OFFSET, }
- /* Get path element by path and path position. */
- #define PATH_OFFSET_PELEMENT(p_s_path,n_offset) ((p_s_path)->path_elements +(n_offset))
- /* Get buffer header at the path by path and path position. */
- #define PATH_OFFSET_PBUFFER(p_s_path,n_offset) (PATH_OFFSET_PELEMENT(p_s_path,n_offset)->pe_buffer)
- /* Get position in the element at the path by path and path position. */
- #define PATH_OFFSET_POSITION(p_s_path,n_offset) (PATH_OFFSET_PELEMENT(p_s_path,n_offset)->pe_position)
- #define PATH_PLAST_BUFFER(p_s_path) (PATH_OFFSET_PBUFFER((p_s_path), (p_s_path)->path_length))
- /* you know, to the person who didn't
- write this the macro name does not
- at first suggest what it does.
- Maybe POSITION_FROM_PATH_END? Or
- maybe we should just focus on
- dumping paths... -Hans */
- #define PATH_LAST_POSITION(p_s_path) (PATH_OFFSET_POSITION((p_s_path), (p_s_path)->path_length))
- #define PATH_PITEM_HEAD(p_s_path) B_N_PITEM_HEAD(PATH_PLAST_BUFFER(p_s_path),PATH_LAST_POSITION(p_s_path))
- /* in do_balance leaf has h == 0 in contrast with path structure,
- where root has level == 0. That is why we need these defines */
- #define PATH_H_PBUFFER(p_s_path, h) PATH_OFFSET_PBUFFER (p_s_path, p_s_path->path_length - (h)) /* tb->S[h] */
- #define PATH_H_PPARENT(path, h) PATH_H_PBUFFER (path, (h) + 1) /* tb->F[h] or tb->S[0]->b_parent */
- #define PATH_H_POSITION(path, h) PATH_OFFSET_POSITION (path, path->path_length - (h))
- #define PATH_H_B_ITEM_ORDER(path, h) PATH_H_POSITION(path, h + 1) /* tb->S[h]->b_item_order */
- #define PATH_H_PATH_OFFSET(p_s_path, n_h) ((p_s_path)->path_length - (n_h))
- #define get_last_bh(path) PATH_PLAST_BUFFER(path)
- #define get_ih(path) PATH_PITEM_HEAD(path)
- #define get_item_pos(path) PATH_LAST_POSITION(path)
- #define get_item(path) ((void *)B_N_PITEM(PATH_PLAST_BUFFER(path), PATH_LAST_POSITION (path)))
- #define item_moved(ih,path) comp_items(ih, path)
- #define path_changed(ih,path) comp_items (ih, path)
- /***************************************************************************/
- /* MISC */
- /***************************************************************************/
- /* Size of pointer to the unformatted node. */
- #define UNFM_P_SIZE (sizeof(unp_t))
- // in in-core inode key is stored on le form
- #define INODE_PKEY(inode) ((struct key *)((inode)->u.reiserfs_i.i_key))
- #define MAX_UL_INT 0xffffffff
- #define MAX_INT 0x7ffffff
- #define MAX_US_INT 0xffff
- // reiserfs version 2 has max offset 60 bits. Version 1 - 32 bit offset
- #define U32_MAX (~(__u32)0)
- static inline loff_t max_reiserfs_offset (const struct inode * inode)
- {
- if (get_inode_item_key_version(inode) == KEY_FORMAT_3_5)
- return (loff_t)U32_MAX;
- return (loff_t)((~(__u64)0) >> 4);
- }
- /*#define MAX_KEY_UNIQUENESS MAX_UL_INT*/
- #define MAX_KEY_OBJECTID MAX_UL_INT
- #define MAX_B_NUM MAX_UL_INT
- #define MAX_FC_NUM MAX_US_INT
- /* the purpose is to detect overflow of an unsigned short */
- #define REISERFS_LINK_MAX (MAX_US_INT - 1000)
- /* The following defines are used in reiserfs_insert_item and reiserfs_append_item */
- #define REISERFS_KERNEL_MEM 0 /* reiserfs kernel memory mode */
- #define REISERFS_USER_MEM 1 /* reiserfs user memory mode */
- #define fs_generation(s) ((s)->u.reiserfs_sb.s_generation_counter)
- #define get_generation(s) atomic_read (&fs_generation(s))
- #define FILESYSTEM_CHANGED_TB(tb) (get_generation((tb)->tb_sb) != (tb)->fs_gen)
- #define fs_changed(gen,s) (gen != get_generation (s))
- /***************************************************************************/
- /* FIXATE NODES */
- /***************************************************************************/
- #define VI_TYPE_LEFT_MERGEABLE 1
- #define VI_TYPE_RIGHT_MERGEABLE 2
- /* To make any changes in the tree we always first find node, that
- contains item to be changed/deleted or place to insert a new
- item. We call this node S. To do balancing we need to decide what
- we will shift to left/right neighbor, or to a new node, where new
- item will be etc. To make this analysis simpler we build virtual
- node. Virtual node is an array of items, that will replace items of
- node S. (For instance if we are going to delete an item, virtual
- node does not contain it). Virtual node keeps information about
- item sizes and types, mergeability of first and last items, sizes
- of all entries in directory item. We use this array of items when
- calculating what we can shift to neighbors and how many nodes we
- have to have if we do not any shiftings, if we shift to left/right
- neighbor or to both. */
- struct virtual_item
- {
- int vi_index; // index in the array of item operations
- unsigned short vi_type; // left/right mergeability
- unsigned short vi_item_len; /* length of item that it will have after balancing */
- struct item_head * vi_ih;
- const char * vi_item; // body of item (old or new)
- const void * vi_new_data; // 0 always but paste mode
- void * vi_uarea; // item specific area
- };
- struct virtual_node
- {
- char * vn_free_ptr; /* this is a pointer to the free space in the buffer */
- unsigned short vn_nr_item; /* number of items in virtual node */
- short vn_size; /* size of node , that node would have if it has unlimited size and no balancing is performed */
- short vn_mode; /* mode of balancing (paste, insert, delete, cut) */
- short vn_affected_item_num;
- short vn_pos_in_item;
- struct item_head * vn_ins_ih; /* item header of inserted item, 0 for other modes */
- const void * vn_data;
- struct virtual_item * vn_vi; /* array of items (including a new one, excluding item to be deleted) */
- };
- /***************************************************************************/
- /* TREE BALANCE */
- /***************************************************************************/
- /* This temporary structure is used in tree balance algorithms, and
- constructed as we go to the extent that its various parts are
- needed. It contains arrays of nodes that can potentially be
- involved in the balancing of node S, and parameters that define how
- each of the nodes must be balanced. Note that in these algorithms
- for balancing the worst case is to need to balance the current node
- S and the left and right neighbors and all of their parents plus
- create a new node. We implement S1 balancing for the leaf nodes
- and S0 balancing for the internal nodes (S1 and S0 are defined in
- our papers.)*/
- #define MAX_FREE_BLOCK 7 /* size of the array of buffers to free at end of do_balance */
- /* maximum number of FEB blocknrs on a single level */
- #define MAX_AMOUNT_NEEDED 2
- /* someday somebody will prefix every field in this struct with tb_ */
- struct tree_balance
- {
- int tb_mode;
- int need_balance_dirty;
- struct super_block * tb_sb;
- struct reiserfs_transaction_handle *transaction_handle ;
- struct path * tb_path;
- struct buffer_head * L[MAX_HEIGHT]; /* array of left neighbors of nodes in the path */
- struct buffer_head * R[MAX_HEIGHT]; /* array of right neighbors of nodes in the path*/
- struct buffer_head * FL[MAX_HEIGHT]; /* array of fathers of the left neighbors */
- struct buffer_head * FR[MAX_HEIGHT]; /* array of fathers of the right neighbors */
- struct buffer_head * CFL[MAX_HEIGHT]; /* array of common parents of center node and its left neighbor */
- struct buffer_head * CFR[MAX_HEIGHT]; /* array of common parents of center node and its right neighbor */
- struct buffer_head * FEB[MAX_FEB_SIZE]; /* array of empty buffers. Number of buffers in array equals
- cur_blknum. */
- struct buffer_head * used[MAX_FEB_SIZE];
- struct buffer_head * thrown[MAX_FEB_SIZE];
- int lnum[MAX_HEIGHT]; /* array of number of items which must be
- shifted to the left in order to balance the
- current node; for leaves includes item that
- will be partially shifted; for internal
- nodes, it is the number of child pointers
- rather than items. It includes the new item
- being created. The code sometimes subtracts
- one to get the number of wholly shifted
- items for other purposes. */
- int rnum[MAX_HEIGHT]; /* substitute right for left in comment above */
- int lkey[MAX_HEIGHT]; /* array indexed by height h mapping the key delimiting L[h] and
- S[h] to its item number within the node CFL[h] */
- int rkey[MAX_HEIGHT]; /* substitute r for l in comment above */
- int insert_size[MAX_HEIGHT]; /* the number of bytes by we are trying to add or remove from
- S[h]. A negative value means removing. */
- int blknum[MAX_HEIGHT]; /* number of nodes that will replace node S[h] after
- balancing on the level h of the tree. If 0 then S is
- being deleted, if 1 then S is remaining and no new nodes
- are being created, if 2 or 3 then 1 or 2 new nodes is
- being created */
- /* fields that are used only for balancing leaves of the tree */
- int cur_blknum; /* number of empty blocks having been already allocated */
- int s0num; /* number of items that fall into left most node when S[0] splits */
- int s1num; /* number of items that fall into first new node when S[0] splits */
- int s2num; /* number of items that fall into second new node when S[0] splits */
- int lbytes; /* number of bytes which can flow to the left neighbor from the left */
- /* most liquid item that cannot be shifted from S[0] entirely */
- /* if -1 then nothing will be partially shifted */
- int rbytes; /* number of bytes which will flow to the right neighbor from the right */
- /* most liquid item that cannot be shifted from S[0] entirely */
- /* if -1 then nothing will be partially shifted */
- int s1bytes; /* number of bytes which flow to the first new node when S[0] splits */
- /* note: if S[0] splits into 3 nodes, then items do not need to be cut */
- int s2bytes;
- struct buffer_head * buf_to_free[MAX_FREE_BLOCK]; /* buffers which are to be freed after do_balance finishes by unfix_nodes */
- char * vn_buf; /* kmalloced memory. Used to create
- virtual node and keep map of
- dirtied bitmap blocks */
- int vn_buf_size; /* size of the vn_buf */
- struct virtual_node * tb_vn; /* VN starts after bitmap of bitmap blocks */
- int fs_gen; /* saved value of `reiserfs_generation' counter
- see FILESYSTEM_CHANGED() macro in reiserfs_fs.h */
- } ;
- /* These are modes of balancing */
- /* When inserting an item. */
- #define M_INSERT 'i'
- /* When inserting into (directories only) or appending onto an already
- existant item. */
- #define M_PASTE 'p'
- /* When deleting an item. */
- #define M_DELETE 'd'
- /* When truncating an item or removing an entry from a (directory) item. */
- #define M_CUT 'c'
- /* used when balancing on leaf level skipped (in reiserfsck) */
- #define M_INTERNAL 'n'
- /* When further balancing is not needed, then do_balance does not need
- to be called. */
- #define M_SKIP_BALANCING 's'
- #define M_CONVERT 'v'
- /* modes of leaf_move_items */
- #define LEAF_FROM_S_TO_L 0
- #define LEAF_FROM_S_TO_R 1
- #define LEAF_FROM_R_TO_L 2
- #define LEAF_FROM_L_TO_R 3
- #define LEAF_FROM_S_TO_SNEW 4
- #define FIRST_TO_LAST 0
- #define LAST_TO_FIRST 1
- /* used in do_balance for passing parent of node information that has
- been gotten from tb struct */
- struct buffer_info {
- struct tree_balance * tb;
- struct buffer_head * bi_bh;
- struct buffer_head * bi_parent;
- int bi_position;
- };
- /* there are 4 types of items: stat data, directory item, indirect, direct.
- +-------------------+------------+--------------+------------+
- | | k_offset | k_uniqueness | mergeable? |
- +-------------------+------------+--------------+------------+
- | stat data | 0 | 0 | no |
- +-------------------+------------+--------------+------------+
- | 1st directory item| DOT_OFFSET |DIRENTRY_UNIQUENESS| no |
- | non 1st directory | hash value | | yes |
- | item | | | |
- +-------------------+------------+--------------+------------+
- | indirect item | offset + 1 |TYPE_INDIRECT | if this is not the first indirect item of the object
- +-------------------+------------+--------------+------------+
- | direct item | offset + 1 |TYPE_DIRECT | if not this is not the first direct item of the object
- +-------------------+------------+--------------+------------+
- */
- struct item_operations {
- int (*bytes_number) (struct item_head * ih, int block_size);
- void (*decrement_key) (struct cpu_key *);
- int (*is_left_mergeable) (struct key * ih, unsigned long bsize);
- void (*print_item) (struct item_head *, char * item);
- void (*check_item) (struct item_head *, char * item);
- int (*create_vi) (struct virtual_node * vn, struct virtual_item * vi,
- int is_affected, int insert_size);
- int (*check_left) (struct virtual_item * vi, int free,
- int start_skip, int end_skip);
- int (*check_right) (struct virtual_item * vi, int free);
- int (*part_size) (struct virtual_item * vi, int from, int to);
- int (*unit_num) (struct virtual_item * vi);
- void (*print_vi) (struct virtual_item * vi);
- };
- extern struct item_operations stat_data_ops, indirect_ops, direct_ops,
- direntry_ops;
- extern struct item_operations * item_ops [4];
- #define op_bytes_number(ih,bsize) item_ops[le_ih_k_type (ih)]->bytes_number (ih, bsize)
- #define op_is_left_mergeable(key,bsize) item_ops[le_key_k_type (le_key_version (key), key)]->is_left_mergeable (key, bsize)
- #define op_print_item(ih,item) item_ops[le_ih_k_type (ih)]->print_item (ih, item)
- #define op_check_item(ih,item) item_ops[le_ih_k_type (ih)]->check_item (ih, item)
- #define op_create_vi(vn,vi,is_affected,insert_size) item_ops[le_ih_k_type ((vi)->vi_ih)]->create_vi (vn,vi,is_affected,insert_size)
- #define op_check_left(vi,free,start_skip,end_skip) item_ops[(vi)->vi_index]->check_left (vi, free, start_skip, end_skip)
- #define op_check_right(vi,free) item_ops[(vi)->vi_index]->check_right (vi, free)
- #define op_part_size(vi,from,to) item_ops[(vi)->vi_index]->part_size (vi, from, to)
- #define op_unit_num(vi) item_ops[(vi)->vi_index]->unit_num (vi)
- #define op_print_vi(vi) item_ops[(vi)->vi_index]->print_vi (vi)
- #define COMP_KEYS comp_keys
- #define COMP_SHORT_KEYS comp_short_keys
- /*#define keys_of_same_object comp_short_keys*/
- /* number of blocks pointed to by the indirect item */
- #define I_UNFM_NUM(p_s_ih) ( ih_item_len(p_s_ih) / UNFM_P_SIZE )
- /* the used space within the unformatted node corresponding to pos within the item pointed to by ih */
- #define I_POS_UNFM_SIZE(ih,pos,size) (((pos) == I_UNFM_NUM(ih) - 1 ) ? (size) - ih_free_space(ih) : (size))
- /* number of bytes contained by the direct item or the unformatted nodes the indirect item points to */
- /* get the item header */
- #define B_N_PITEM_HEAD(bh,item_num) ( (struct item_head * )((bh)->b_data + BLKH_SIZE) + (item_num) )
- /* get key */
- #define B_N_PDELIM_KEY(bh,item_num) ( (struct key * )((bh)->b_data + BLKH_SIZE) + (item_num) )
- /* get the key */
- #define B_N_PKEY(bh,item_num) ( &(B_N_PITEM_HEAD(bh,item_num)->ih_key) )
- /* get item body */
- #define B_N_PITEM(bh,item_num) ( (bh)->b_data + ih_location(B_N_PITEM_HEAD((bh),(item_num))))
- /* get the stat data by the buffer header and the item order */
- #define B_N_STAT_DATA(bh,nr)
- ( (struct stat_data *)((bh)->b_data + ih_location(B_N_PITEM_HEAD((bh),(nr))) ) )
- /* following defines use reiserfs buffer header and item header */
- /* get stat-data */
- #define B_I_STAT_DATA(bh, ih) ( (struct stat_data * )((bh)->b_data + ih_location(ih)) )
- // this is 3976 for size==4096
- #define MAX_DIRECT_ITEM_LEN(size) ((size) - BLKH_SIZE - 2*IH_SIZE - SD_SIZE - UNFM_P_SIZE)
- /* indirect items consist of entries which contain blocknrs, pos
- indicates which entry, and B_I_POS_UNFM_POINTER resolves to the
- blocknr contained by the entry pos points to */
- #define B_I_POS_UNFM_POINTER(bh,ih,pos) le32_to_cpu(*(((unp_t *)B_I_PITEM(bh,ih)) + (pos)))
- #define PUT_B_I_POS_UNFM_POINTER(bh,ih,pos, val) do {*(((unp_t *)B_I_PITEM(bh,ih)) + (pos)) = cpu_to_le32(val); } while (0)
- struct reiserfs_iget4_args {
- __u32 objectid ;
- } ;
- /***************************************************************************/
- /* FUNCTION DECLARATIONS */
- /***************************************************************************/
- /*#ifdef __KERNEL__*/
- /* journal.c see journal.c for all the comments here */
- #define JOURNAL_TRANS_HALF 1018 /* must be correct to keep the desc and commit structs at 4k */
- /* first block written in a commit. */
- struct reiserfs_journal_desc {
- __u32 j_trans_id ; /* id of commit */
- __u32 j_len ; /* length of commit. len +1 is the commit block */
- __u32 j_mount_id ; /* mount id of this trans*/
- __u32 j_realblock[JOURNAL_TRANS_HALF] ; /* real locations for each block */
- char j_magic[12] ;
- } ;
- /* last block written in a commit */
- struct reiserfs_journal_commit {
- __u32 j_trans_id ; /* must match j_trans_id from the desc block */
- __u32 j_len ; /* ditto */
- __u32 j_realblock[JOURNAL_TRANS_HALF] ; /* real locations for each block */
- char j_digest[16] ; /* md5 sum of all the blocks involved, including desc and commit. not used, kill it */
- } ;
- /* this header block gets written whenever a transaction is considered fully flushed, and is more recent than the
- ** last fully flushed transaction. fully flushed means all the log blocks and all the real blocks are on disk,
- ** and this transaction does not need to be replayed.
- */
- struct reiserfs_journal_header {
- __u32 j_last_flush_trans_id ; /* id of last fully flushed transaction */
- __u32 j_first_unflushed_offset ; /* offset in the log of where to start replay after a crash */
- __u32 j_mount_id ;
- } ;
- extern task_queue reiserfs_commit_thread_tq ;
- extern wait_queue_head_t reiserfs_commit_thread_wait ;
- /* biggest tunable defines are right here */
- #define JOURNAL_BLOCK_COUNT 8192 /* number of blocks in the journal */
- #define JOURNAL_MAX_BATCH 900 /* max blocks to batch into one transaction, don't make this any bigger than 900 */
- #define JOURNAL_MAX_COMMIT_AGE 30
- #define JOURNAL_MAX_TRANS_AGE 30
- #define JOURNAL_PER_BALANCE_CNT (3 * (MAX_HEIGHT-2) + 9)
- /* both of these can be as low as 1, or as high as you want. The min is the
- ** number of 4k bitmap nodes preallocated on mount. New nodes are allocated
- ** as needed, and released when transactions are committed. On release, if
- ** the current number of nodes is > max, the node is freed, otherwise,
- ** it is put on a free list for faster use later.
- */
- #define REISERFS_MIN_BITMAP_NODES 10
- #define REISERFS_MAX_BITMAP_NODES 100
- #define JBH_HASH_SHIFT 13 /* these are based on journal hash size of 8192 */
- #define JBH_HASH_MASK 8191
- /* After several hours of tedious analysis, the following hash
- * function won. Do not mess with it... -DaveM
- */
- #define _jhashfn(dev,block)
- ((((dev)<<(JBH_HASH_SHIFT - 6)) ^ ((dev)<<(JBH_HASH_SHIFT - 9))) ^
- (((block)<<(JBH_HASH_SHIFT - 6)) ^ ((block) >> 13) ^ ((block) << (JBH_HASH_SHIFT - 12))))
- #define journal_hash(t,dev,block) ((t)[_jhashfn((dev),(block)) & JBH_HASH_MASK])
- /* finds n'th buffer with 0 being the start of this commit. Needs to go away, j_ap_blocks has changed
- ** since I created this. One chunk of code in journal.c needs changing before deleting it
- */
- #define JOURNAL_BUFFER(j,n) ((j)->j_ap_blocks[((j)->j_start + (n)) % JOURNAL_BLOCK_COUNT])
- void reiserfs_commit_for_inode(struct inode *) ;
- void reiserfs_update_inode_transaction(struct inode *) ;
- void reiserfs_wait_on_write_block(struct super_block *s) ;
- void reiserfs_block_writes(struct reiserfs_transaction_handle *th) ;
- void reiserfs_allow_writes(struct super_block *s) ;
- void reiserfs_check_lock_depth(char *caller) ;
- void reiserfs_prepare_for_journal(struct super_block *, struct buffer_head *bh, int wait) ;
- void reiserfs_restore_prepared_buffer(struct super_block *, struct buffer_head *bh) ;
- int journal_init(struct super_block *) ;
- int journal_release(struct reiserfs_transaction_handle*, struct super_block *) ;
- int journal_release_error(struct reiserfs_transaction_handle*, struct super_block *) ;
- int journal_end(struct reiserfs_transaction_handle *, struct super_block *, unsigned long) ;
- int journal_end_sync(struct reiserfs_transaction_handle *, struct super_block *, unsigned long) ;
- int journal_mark_dirty_nolog(struct reiserfs_transaction_handle *, struct super_block *, struct buffer_head *bh) ;
- int journal_mark_freed(struct reiserfs_transaction_handle *, struct super_block *, unsigned long blocknr) ;
- int push_journal_writer(char *w) ;
- int pop_journal_writer(int windex) ;
- int journal_transaction_should_end(struct reiserfs_transaction_handle *, int) ;
- int reiserfs_in_journal(struct super_block *p_s_sb, kdev_t dev, unsigned long bl, int size, int searchall, unsigned long *next) ;
- int journal_begin(struct reiserfs_transaction_handle *, struct super_block *p_s_sb, unsigned long) ;
- struct super_block *reiserfs_get_super(kdev_t dev) ;
- void flush_async_commits(struct super_block *p_s_sb) ;
- int buffer_journaled(const struct buffer_head *bh) ;
- int mark_buffer_journal_new(struct buffer_head *bh) ;
- int reiserfs_sync_all_buffers(kdev_t dev, int wait) ;
- int reiserfs_sync_buffers(kdev_t dev, int wait) ;
- int reiserfs_add_page_to_flush_list(struct reiserfs_transaction_handle *,
- struct inode *, struct buffer_head *) ;
- int reiserfs_remove_page_from_flush_list(struct reiserfs_transaction_handle *,
- struct inode *) ;
- int reiserfs_allocate_list_bitmaps(struct super_block *s, struct reiserfs_list_bitmap *, int) ;
- /* why is this kerplunked right here? */
- static inline int reiserfs_buffer_prepared(const struct buffer_head *bh) {
- if (bh && test_bit(BH_JPrepared, ( struct buffer_head * ) &bh->b_state))
- return 1 ;
- else
- return 0 ;
- }
- /* buffer was journaled, waiting to get to disk */
- static inline int buffer_journal_dirty(const struct buffer_head *bh) {
- if (bh)
- return test_bit(BH_JDirty_wait, ( struct buffer_head * ) &bh->b_state) ;
- else
- return 0 ;
- }
- static inline int mark_buffer_notjournal_dirty(struct buffer_head *bh) {
- if (bh)
- clear_bit(BH_JDirty_wait, &bh->b_state) ;
- return 0 ;
- }
- static inline int mark_buffer_notjournal_new(struct buffer_head *bh) {
- if (bh) {
- clear_bit(BH_JNew, &bh->b_state) ;
- }
- return 0 ;
- }
- void add_save_link (struct reiserfs_transaction_handle * th,
- struct inode * inode, int truncate);
- void remove_save_link (struct inode * inode, int truncate);
- /* objectid.c */
- __u32 reiserfs_get_unused_objectid (struct reiserfs_transaction_handle *th);
- void reiserfs_release_objectid (struct reiserfs_transaction_handle *th, __u32 objectid_to_release);
- int reiserfs_convert_objectid_map_v1(struct super_block *) ;
- /* stree.c */
- int B_IS_IN_TREE(const struct buffer_head *);
- extern inline void copy_short_key (void * to, const void * from);
- extern inline void copy_item_head(struct item_head * p_v_to,
- const struct item_head * p_v_from);
- // first key is in cpu form, second - le
- extern inline int comp_keys (const struct key * le_key,
- const struct cpu_key * cpu_key);
- extern inline int comp_short_keys (const struct key * le_key,
- const struct cpu_key * cpu_key);
- extern inline void le_key2cpu_key (struct cpu_key * to, const struct key * from);
- // both are cpu keys
- extern inline int comp_cpu_keys (const struct cpu_key *, const struct cpu_key *);
- extern inline int comp_short_cpu_keys (const struct cpu_key *,
- const struct cpu_key *);
- extern inline void cpu_key2cpu_key (struct cpu_key *, const struct cpu_key *);
- // both are in le form
- extern inline int comp_le_keys (const struct key *, const struct key *);
- extern inline int comp_short_le_keys (const struct key *, const struct key *);
- //
- // get key version from on disk key - kludge
- //
- static inline int le_key_version (const struct key * key)
- {
- int type;
-
- type = offset_v2_k_type( &(key->u.k_offset_v2));
- if (type != TYPE_DIRECT && type != TYPE_INDIRECT && type != TYPE_DIRENTRY)
- return KEY_FORMAT_3_5;
- return KEY_FORMAT_3_6;
-
- }
- static inline void copy_key (struct key *to, const struct key *from)
- {
- memcpy (to, from, KEY_SIZE);
- }
- int comp_items (const struct item_head * stored_ih, const struct path * p_s_path);
- const struct key * get_rkey (const struct path * p_s_chk_path,
- const struct super_block * p_s_sb);
- inline int bin_search (const void * p_v_key, const void * p_v_base,
- int p_n_num, int p_n_width, int * p_n_pos);
- int search_by_key (struct super_block *, const struct cpu_key *,
- struct path *, int);
- #define search_item(s,key,path) search_by_key (s, key, path, DISK_LEAF_NODE_LEVEL)
- int search_for_position_by_key (struct super_block * p_s_sb,
- const struct cpu_key * p_s_cpu_key,
- struct path * p_s_search_path);
- extern inline void decrement_bcount (struct buffer_head * p_s_bh);
- void decrement_counters_in_path (struct path * p_s_search_path);
- void pathrelse (struct path * p_s_search_path);
- int reiserfs_check_path(struct path *p) ;
- void pathrelse_and_restore (struct super_block *s, struct path * p_s_search_path);
- int reiserfs_insert_item (struct reiserfs_transaction_handle *th,
- struct path * path,
- const struct cpu_key * key,
- struct item_head * ih, const char * body);
- int reiserfs_paste_into_item (struct reiserfs_transaction_handle *th,
- struct path * path,
- const struct cpu_key * key,
- const char * body, int paste_size);
- int reiserfs_cut_from_item (struct reiserfs_transaction_handle *th,
- struct path * path,
- struct cpu_key * key,
- struct inode * inode,
- struct page *page,
- loff_t new_file_size);
- int reiserfs_delete_item (struct reiserfs_transaction_handle *th,
- struct path * path,
- const struct cpu_key * key,
- struct inode * inode,
- struct buffer_head * p_s_un_bh);
- void reiserfs_delete_solid_item (struct reiserfs_transaction_handle *th,
- struct key * key);
- void reiserfs_delete_object (struct reiserfs_transaction_handle *th, struct inode * p_s_inode);
- void reiserfs_do_truncate (struct reiserfs_transaction_handle *th,
- struct inode * p_s_inode, struct page *,
- int update_timestamps);
- #define block_size(inode) ((inode)->i_sb->s_blocksize)
- #define file_size(inode) ((inode)->i_size)
- #define tail_size(inode) (file_size (inode) & (block_size (inode) - 1))
- #define tail_has_to_be_packed(inode) (!dont_have_tails ((inode)->i_sb) &&
- !STORE_TAIL_IN_UNFM(file_size (inode), tail_size(inode), block_size (inode)))
- void padd_item (char * item, int total_length, int length);
- /* inode.c */
- void reiserfs_read_inode (struct inode * inode) ;
- void reiserfs_read_inode2(struct inode * inode, void *p) ;
- void reiserfs_delete_inode (struct inode * inode);
- void reiserfs_write_inode (struct inode * inode, int) ;
- struct dentry *reiserfs_fh_to_dentry(struct super_block *sb, __u32 *data,
- int len, int fhtype, int parent);
- int reiserfs_dentry_to_fh(struct dentry *dentry, __u32 *data, int *lenp, int need_parent);
- int reiserfs_prepare_write(struct file *, struct page *, unsigned, unsigned) ;
- void reiserfs_truncate_file(struct inode *, int update_timestamps) ;
- void make_cpu_key (struct cpu_key * cpu_key, const struct inode * inode, loff_t offset,
- int type, int key_length);
- void make_le_item_head (struct item_head * ih, const struct cpu_key * key,
- int version,
- loff_t offset, int type, int length, int entry_count);
- struct inode * reiserfs_iget (struct super_block * s,
- const struct cpu_key * key);
- struct inode * reiserfs_new_inode (struct reiserfs_transaction_handle *th,
- const struct inode * dir, int mode,
- const char * symname, int item_len,
- struct dentry *dentry, struct inode *inode, int * err);
- int reiserfs_sync_inode (struct reiserfs_transaction_handle *th, struct inode * inode);
- void reiserfs_update_sd (struct reiserfs_transaction_handle *th, struct inode * inode);
- /* namei.c */
- inline void set_de_name_and_namelen (struct reiserfs_dir_entry * de);
- int search_by_entry_key (struct super_block * sb, const struct cpu_key * key,
- struct path * path,
- struct reiserfs_dir_entry * de);
- /* procfs.c */
- #if defined( CONFIG_PROC_FS ) && defined( CONFIG_REISERFS_PROC_INFO )
- #define REISERFS_PROC_INFO
- #else
- #undef REISERFS_PROC_INFO
- #endif
- int reiserfs_proc_info_init( struct super_block *sb );
- int reiserfs_proc_info_done( struct super_block *sb );
- struct proc_dir_entry *reiserfs_proc_register( struct super_block *sb,
- char *name, read_proc_t *func );
- void reiserfs_proc_unregister( struct super_block *sb, const char *name );
- struct proc_dir_entry *reiserfs_proc_register_global( char *name,
- read_proc_t *func );
- void reiserfs_proc_unregister_global( const char *name );
- int reiserfs_proc_info_global_init( void );
- int reiserfs_proc_info_global_done( void );
- int reiserfs_proc_tail( int len, char *buffer, char **start,
- off_t offset, int count, int *eof );
- int reiserfs_global_version_in_proc( char *buffer, char **start, off_t offset,
- int count, int *eof, void *data );
- int reiserfs_version_in_proc( char *buffer, char **start, off_t offset,
- int count, int *eof, void *data );
- int reiserfs_super_in_proc( char *buffer, char **start, off_t offset,
- int count, int *eof, void *data );
- int reiserfs_per_level_in_proc( char *buffer, char **start, off_t offset,
- int count, int *eof, void *data );
- int reiserfs_bitmap_in_proc( char *buffer, char **start, off_t offset,
- int count, int *eof, void *data );
- int reiserfs_on_disk_super_in_proc( char *buffer, char **start, off_t offset,
- int count, int *eof, void *data );
- int reiserfs_oidmap_in_proc( char *buffer, char **start, off_t offset,
- int count, int *eof, void *data );
- int reiserfs_journal_in_proc( char *buffer, char **start, off_t offset,
- int count, int *eof, void *data );
- #if defined( REISERFS_PROC_INFO )
- #define PROC_EXP( e ) e
- #define MAX( a, b ) ( ( ( a ) > ( b ) ) ? ( a ) : ( b ) )
- #define __PINFO( sb ) ( sb ) -> u.reiserfs_sb.s_proc_info_data
- #define PROC_INFO_MAX( sb, field, value )
- __PINFO( sb ).field =
- MAX( ( sb ) -> u.reiserfs_sb.s_proc_info_data.field, value )
- #define PROC_INFO_INC( sb, field ) ( ++ ( __PINFO( sb ).field ) )
- #define PROC_INFO_ADD( sb, field, val ) ( __PINFO( sb ).field += ( val ) )
- #define PROC_INFO_BH_STAT( sb, bh, level )
- PROC_INFO_INC( sb, sbk_read_at[ ( level ) ] );
- PROC_INFO_ADD( sb, free_at[ ( level ) ], B_FREE_SPACE( bh ) );
- PROC_INFO_ADD( sb, items_at[ ( level ) ], B_NR_ITEMS( bh ) )
- #else
- #define PROC_EXP( e )
- #define VOID_V ( ( void ) 0 )
- #define PROC_INFO_MAX( sb, field, value ) VOID_V
- #define PROC_INFO_INC( sb, field ) VOID_V
- #define PROC_INFO_ADD( sb, field, val ) VOID_V
- #define PROC_INFO_BH_STAT( p_s_sb, p_s_bh, n_node_level ) VOID_V
- #endif
- /* dir.c */
- extern struct inode_operations reiserfs_dir_inode_operations;
- extern struct file_operations reiserfs_dir_operations;
- /* tail_conversion.c */
- int direct2indirect (struct reiserfs_transaction_handle *, struct inode *, struct path *, struct buffer_head *, loff_t);
- int indirect2direct (struct reiserfs_transaction_handle *, struct inode *, struct page *, struct path *, const struct cpu_key *, loff_t, char *);
- void reiserfs_unmap_buffer(struct buffer_head *) ;
- /* file.c */
- extern struct inode_operations reiserfs_file_inode_operations;
- extern struct file_operations reiserfs_file_operations;
- extern struct address_space_operations reiserfs_address_space_operations ;
- int get_new_buffer (struct reiserfs_transaction_handle *th, struct buffer_head *,
- struct buffer_head **, struct path *);
- /* buffer2.c */
- struct buffer_head * reiserfs_getblk (kdev_t n_dev, int n_block, int n_size);
- void wait_buffer_until_released (const struct buffer_head * bh);
- struct buffer_head * reiserfs_bread (struct super_block *super, int n_block,
- int n_size);
- /* fix_nodes.c */
- void * reiserfs_kmalloc (size_t size, int flags, struct super_block * s);
- void reiserfs_kfree (const void * vp, size_t size, struct super_block * s);
- int fix_nodes (int n_op_mode, struct tree_balance * p_s_tb,
- struct item_head * p_s_ins_ih, const void *);
- void unfix_nodes (struct tree_balance *);
- void free_buffers_in_tb (struct tree_balance * p_s_tb);
- /* prints.c */
- void reiserfs_panic (struct super_block * s, const char * fmt, ...)
- __attribute__ ( ( noreturn ) );/* __attribute__( ( format ( printf, 2, 3 ) ) ) */
- void reiserfs_debug (struct super_block *s, int level, const char * fmt, ...);
- /* __attribute__( ( format ( printf, 3, 4 ) ) ); */
- void print_virtual_node (struct virtual_node * vn);
- void print_indirect_item (struct buffer_head * bh, int item_num);
- void store_print_tb (struct tree_balance * tb);
- void print_cur_tb (char * mes);
- void print_de (struct reiserfs_dir_entry * de);
- void print_bi (struct buffer_info * bi, char * mes);
- #define PRINT_LEAF_ITEMS 1 /* print all items */
- #define PRINT_DIRECTORY_ITEMS 2 /* print directory items */
- #define PRINT_DIRECT_ITEMS 4 /* print contents of direct items */
- void print_block (struct buffer_head * bh, ...);
- void print_path (struct tree_balance * tb, struct path * path);
- void print_bmap (struct super_block * s, int silent);
- void print_bmap_block (int i, char * data, int size, int silent);
- /*void print_super_block (struct super_block * s, char * mes);*/
- void print_objectid_map (struct super_block * s);
- void print_block_head (struct buffer_head * bh, char * mes);
- void check_leaf (struct buffer_head * bh);
- void check_internal (struct buffer_head * bh);
- void print_statistics (struct super_block * s);
- /* lbalance.c */
- int leaf_move_items (int shift_mode, struct tree_balance * tb, int mov_num, int mov_bytes, struct buffer_head * Snew);
- int leaf_shift_left (struct tree_balance * tb, int shift_num, int shift_bytes);
- int leaf_shift_right (struct tree_balance * tb, int shift_num, int shift_bytes);
- void leaf_delete_items (struct buffer_info * cur_bi, int last_first, int first, int del_num, int del_bytes);
- void leaf_insert_into_buf (struct buffer_info * bi, int before,
- struct item_head * inserted_item_ih, const char * inserted_item_body, int zeros_number);
- void leaf_paste_in_buffer (struct buffer_info * bi, int pasted_item_num,
- int pos_in_item, int paste_size, const char * body, int zeros_number);
- void leaf_cut_from_buffer (struct buffer_info * bi, int cut_item_num, int pos_in_item,
- int cut_size);
- void leaf_paste_entries (struct buffer_head * bh, int item_num, int before,
- int new_entry_count, struct reiserfs_de_head * new_dehs, const char * records, int paste_size);
- /* ibalance.c */
- int balance_internal (struct tree_balance * , int, int, struct item_head * ,
- struct buffer_head **);
- /* do_balance.c */
- inline void do_balance_mark_leaf_dirty (struct tree_balance * tb,
- struct buffer_head * bh, int flag);
- #define do_balance_mark_internal_dirty do_balance_mark_leaf_dirty
- #define do_balance_mark_sb_dirty do_balance_mark_leaf_dirty
- void do_balance (struct tree_balance * tb, struct item_head * ih,
- const char * body, int flag);
- void reiserfs_invalidate_buffer (struct tree_balance * tb, struct buffer_head * bh);
- int get_left_neighbor_position (struct tree_balance * tb, int h);
- int get_right_neighbor_position (struct tree_balance * tb, int h);
- void replace_key (struct tree_balance * tb, struct buffer_head *, int, struct buffer_head *, int);
- void replace_lkey (struct tree_balance *, int, struct item_head *);
- void replace_rkey (struct tree_balance *, int, struct item_head *);
- void make_empty_node (struct buffer_info *);
- struct buffer_head * get_FEB (struct tree_balance *);
- /* bitmap.c */
- int is_reusable (struct super_block * s, unsigned long block, int bit_value);
- void reiserfs_free_block (struct reiserfs_transaction_handle *th, unsigned long);
- int reiserfs_new_blocknrs (struct reiserfs_transaction_handle *th,
- unsigned long * pblocknrs, unsigned long start_from, int amount_needed);
- int reiserfs_new_unf_blocknrs (struct reiserfs_transaction_handle *th,
- unsigned long * pblocknr, unsigned long start_from);
- #ifdef REISERFS_PREALLOCATE
- int reiserfs_new_unf_blocknrs2 (struct reiserfs_transaction_handle *th,
- struct inode * inode,
- unsigned long * pblocknr,
- unsigned long start_from);
- void reiserfs_discard_prealloc (struct reiserfs_transaction_handle *th,
- struct inode * inode);
- void reiserfs_discard_all_prealloc (struct reiserfs_transaction_handle *th);
- #endif
- /* hashes.c */
- __u32 keyed_hash (const signed char *msg, int len);
- __u32 yura_hash (const signed char *msg, int len);
- __u32 r5_hash (const signed char *msg, int len);
- /* version.c */
- const char *reiserfs_get_version_string(void) CONSTF;
- /* the ext2 bit routines adjust for big or little endian as
- ** appropriate for the arch, so in our laziness we use them rather
- ** than using the bit routines they call more directly. These
- ** routines must be used when changing on disk bitmaps. */
- #define reiserfs_test_and_set_le_bit ext2_set_bit
- #define reiserfs_test_and_clear_le_bit ext2_clear_bit
- #define reiserfs_test_le_bit ext2_test_bit
- #define reiserfs_find_next_zero_le_bit ext2_find_next_zero_bit
- /* sometimes reiserfs_truncate may require to allocate few new blocks
- to perform indirect2direct conversion. People probably used to
- think, that truncate should work without problems on a filesystem
- without free disk space. They may complain that they can not
- truncate due to lack of free disk space. This spare space allows us
- to not worry about it. 500 is probably too much, but it should be
- absolutely safe */
- #define SPARE_SPACE 500
- static inline unsigned long reiserfs_get_journal_block(const struct super_block *s) {
- return le32_to_cpu(SB_DISK_SUPER_BLOCK(s)->s_journal_block) ;
- }
- static inline unsigned long reiserfs_get_journal_orig_size(const struct super_block *s) {
- return le32_to_cpu(SB_DISK_SUPER_BLOCK(s)->s_orig_journal_size) ;
- }
- /* prototypes from ioctl.c */
- int reiserfs_ioctl (struct inode * inode, struct file * filp,
- unsigned int cmd, unsigned long arg);
- int reiserfs_unpack (struct inode * inode, struct file * filp);
-
- /* ioctl's command */
- #define REISERFS_IOC_UNPACK _IOW(0xCD,1,long)
-
- #endif /* _LINUX_REISER_FS_H */