1 #ifndef __LUNAIX_EXT2_H
2 #define __LUNAIX_EXT2_H
4 #include <lunaix/fs/api.h>
5 #include <lunaix/types.h>
6 #include <lunaix/ds/llist.h>
7 #include <lunaix/ds/hashtable.h>
8 #include <lunaix/ds/lru.h>
10 #ifdef CONFIG_EXT2_DEBUG_MSG
11 # include <lunaix/syslog.h>
12 # define ext2_debug(fmt, ...) kprintf_v("ext2", fmt, ##__VA_ARGS__)
14 # define ext2_debug(fmt, ...)
17 #define FEAT_COMPRESSION 0b00000001
18 #define FEAT_RESIZE_INO 0b00000010
19 #define FEAT_FILETYPE 0b00000100
20 #define FEAT_SPARSE_SB 0b00001000
21 #define FEAT_LARGE_FILE 0b00010000
23 #define IMODE_IFSOCK 0xC000
24 #define IMODE_IFLNK 0xA000
25 #define IMODE_IFREG 0x8000
26 #define IMODE_IFBLK 0x6000
27 #define IMODE_IFDIR 0x4000
28 #define IMODE_IFCHR 0x2000
29 #define IMODE_IFFIFO 0x1000
31 #define IMODE_URD 0x0100
32 #define IMODE_UWR 0x0080
33 #define IMODE_UEX 0x0040
34 #define IMODE_GRD 0x0020
35 #define IMODE_GWR 0x0010
36 #define IMODE_GEX 0x0008
37 #define IMODE_ORD 0x0004
38 #define IMODE_OWR 0x0002
39 #define IMODE_OEX 0x0001
40 #define IMODE_ACL_MASK 0x01ff
42 #define ext2_aligned compact align(4)
43 #define to_ext2ino_id(fsblock_id) ((fsblock_id) + 1)
44 #define to_fsblock_id(ext2_ino) ((ext2_ino) - 1)
46 extern bcache_zone_t gdesc_bcache_zone;
54 u32_t s_first_data_cnt;
74 u32_t s_checkinterval;
87 u32_t s_optional_feat;
88 u32_t s_required_feat;
104 u16_t bg_free_blk_cnt;
105 u16_t bg_free_ino_cnt;
106 u16_t bg_used_dir_cnt;
134 u32_t directs[12]; // directum
137 u32_t ind1; // prima indirecta
138 u32_t ind23[2]; // secunda et tertia indirecta
142 } ext2_aligned i_block;
143 u32_t i_block_arr[15];
165 #define EXT2_DRE(v_dnode) (fsapi_impl_data(v_dnode, struct ext2b_dirent))
168 #define GDESC_INO_SEL 0
169 #define GDESC_BLK_SEL 1
171 #define GDESC_FREE_LISTS \
174 struct llist_header free_grps_ino; \
175 struct llist_header free_grps_blk; \
177 struct llist_header free_list_sel[2]; \
180 #define check_gdesc_type_sel(sel) \
181 assert_msg(sel == GDESC_INO_SEL || sel == GDESC_BLK_SEL, \
188 * offset to inode table (in terms of blocks) within each block group.
189 * to account the difference of backup presence between rev 0/1
194 unsigned int block_size;
195 unsigned int nr_gdesc_pb;
196 unsigned int nr_gdesc;
197 unsigned int all_feature;
200 struct v_superblock* vsb;
202 struct ext2b_super* raw;
204 struct bcache gd_caches;
209 struct llist_header gds;
213 #define EXT2_SB(vsb) (fsapi_impl_data(vsb, struct ext2_sbinfo))
220 unsigned int nr_bytes;
226 struct llist_header groups;
231 struct ext2_bmp ino_bmp;
232 struct ext2_bmp blk_bmp;
234 struct ext2_bmp bmps[2];
238 unsigned int ino_base;
240 struct ext2b_gdesc* info;
241 struct ext2_sbinfo* sb;
247 Indriection Block Translation Look-aside Buffer
249 Provide a look-aside buffer for all last-level indirect block
250 that is at least two indirection away.
253 16 sets, 256 ways, capacity 4096 blocks
256 struct ext2_btlb_entry
265 struct ext2_btlb_entry buffer[BTLB_SETS];
268 struct ext2_fast_inode
270 struct ext2b_inode* ino;
276 bbuf_t buf; // partial inotab that holds this inode
277 unsigned int inds_lgents; // log2(# of block in an indirection level)
283 struct ext2b_inode* ino; // raw ext2 inode
284 struct ext2_btlb* btlb; // block-TLB
285 struct ext2_gdesc* blk_grp; // block group
291 dirent fragmentation degree, we will perform
292 full reconstruction on dirent table when this goes too high.
294 unsigned int dir_fragdeg;
298 // prefetched block for 1st order of indirection
302 #define EXT2_INO(v_inode) (fsapi_impl_data(v_inode, struct ext2_inode))
304 struct ext2_dnode_sub
307 struct ext2b_dirent* dirent;
312 struct ext2_dnode_sub self;
313 struct ext2_dnode_sub prev;
315 #define EXT2_DNO(v_dnode) (fsapi_impl_data(v_dnode, struct ext2_dnode))
319 * @brief General purpose iterator for ext2 objects
324 struct v_inode* inode;
327 struct ext2b_dirent* dirent;
346 struct ext2_iterator iter;
347 struct ext2_inode* b_ino;
349 #define EXT2_FILE(v_file) (fsapi_impl_data(v_file, struct ext2_file))
352 #define MAX_INDS_DEPTH 4
356 unsigned int tables[MAX_INDS_DEPTH];
357 unsigned int indices[MAX_INDS_DEPTH];
362 unsigned int* slot_ref;
367 struct walk_stack stack;
370 static inline unsigned int
371 ext2_datablock(struct v_superblock* vsb, unsigned int id)
373 return EXT2_SB(vsb)->raw->s_first_data_cnt + id;
377 ext2_feature(struct v_superblock* vsb, unsigned int feat)
379 return !!(EXT2_SB(vsb)->all_feature & feat);
382 /* ************ Inodes ************ */
385 ext2ino_init(struct v_superblock* vsb, struct v_inode* inode);
388 ext2ino_get(struct v_superblock* vsb,
389 unsigned int ino, struct ext2_inode** out);
392 ext2ino_get_fast(struct v_superblock* vsb,
393 unsigned int ino, struct ext2_fast_inode* fast_ino);
396 ext2ino_fill(struct v_inode* inode, ino_t ino_id);
399 ext2ino_make(struct v_superblock* vsb, unsigned int itype,
400 struct ext2_inode* hint, struct v_inode** out);
403 ext2ino_update(struct v_inode* inode);
406 ext2ino_resizing(struct v_inode* inode, size_t new_size);
409 ext2ino_linkto(struct ext2_inode* e_ino, struct ext2b_dirent* dirent)
411 dirent->inode = e_ino->ino_id;
412 e_ino->ino->i_lnk_cnt++;
413 fsblock_dirty(e_ino->buf);
416 #define DBIT_MODE_ISIZE 0
417 #define DBIT_MODE_BLOCK 1
420 ext2db_itbegin(struct ext2_iterator* iter, struct v_inode* inode, int mode);
423 ext2db_itend(struct ext2_iterator* iter);
426 ext2db_itnext(struct ext2_iterator* iter);
429 ext2db_itffw(struct ext2_iterator* iter, int count);
432 ext2db_itreset(struct ext2_iterator* iter);
436 * @brief Get the data block at given data pos associated with the
437 * inode, return NULL if not present
444 ext2db_get(struct v_inode* inode, unsigned int data_pos);
447 * @brief Get the data block at given data pos associated with the
448 * inode, allocate one if not present.
456 ext2db_acquire(struct v_inode* inode, unsigned int data_pos, bbuf_t* out);
459 ext2db_free_pos(struct v_inode* inode, unsigned int block_pos);
461 /* ************* Walker ************* */
464 ext2walk_init_state(struct walk_state* state)
466 *state = (struct walk_state) { };
470 ext2walk_free_state(struct walk_state* state)
472 fsblock_put(state->table);
475 /* ************* Iterator ************* */
478 ext2_iterror(struct ext2_iterator* iter) {
479 return iter->has_error;
483 ext2_itcheckbuf(struct ext2_iterator* iter) {
484 return !(iter->has_error = blkbuf_errbuf(iter->sel_buf));
487 #define itstate_sel(iter, value) \
488 (ext2_iterror(iter) ? EIO : (int)(value))
491 /* ************ Block Group ************ */
494 ext2gd_prepare_gdt(struct v_superblock* vsb);
497 ext2gd_release_gdt(struct v_superblock* vsb);
500 ext2gd_take(struct v_superblock* vsb,
501 unsigned int index, struct ext2_gdesc** out);
504 ext2gd_put(struct ext2_gdesc* gd) {
505 bcache_return(gd->cache_ref);
509 /* ************ Directory ************ */
512 ext2dr_lookup(struct v_inode* this, struct v_dnode* dnode);
515 ext2dr_read(struct v_file *file, struct dir_context *dctx);
518 ext2dr_itbegin(struct ext2_iterator* iter, struct v_inode* inode);
521 ext2dr_itend(struct ext2_iterator* iter);
524 ext2dr_itdrain(struct ext2_iterator* iter)
526 return iter->pos > iter->end_pos;
530 ext2dr_itnext(struct ext2_iterator* iter);
533 ext2dr_itffw(struct ext2_iterator* iter, int count);
536 ext2dr_itreset(struct ext2_iterator* iter);
539 ext2dr_open(struct v_inode* this, struct v_file* file);
542 ext2dr_close(struct v_inode* this, struct v_file* file);
545 ext2dr_seek(struct v_file* file, size_t offset);
548 ext2dr_insert(struct v_inode* this, struct ext2b_dirent* dirent,
549 struct ext2_dnode** e_dno_out);
552 ext2dr_remove(struct ext2_dnode* e_dno);
555 ext2_rmdir(struct v_inode* parent, struct v_dnode* dnode);
558 ext2_mkdir(struct v_inode* parent, struct v_dnode* dnode);
561 ext2_rename(struct v_inode* from_inode, struct v_dnode* from_dnode,
562 struct v_dnode* to_dnode);
565 ext2dr_setup_dirent(struct ext2b_dirent* dirent,
566 struct v_inode* inode, struct hstr* name);
569 /* ************ Files ************ */
572 ext2_open_inode(struct v_inode* this, struct v_file* file);
575 ext2_close_inode(struct v_file* file);
578 ext2_sync_inode(struct v_inode* inode);
581 ext2_file_sync(struct v_file* file);
584 ext2_inode_read(struct v_inode *inode, void *buffer, size_t len, size_t fpos);
587 ext2_inode_read_page(struct v_inode *inode, void *buffer, size_t fpos);
590 ext2_inode_write(struct v_inode *inode, void *buffer, size_t len, size_t fpos);
593 ext2_inode_write_page(struct v_inode *inode, void *buffer, size_t fpos);
596 ext2_seek_inode(struct v_file* file, size_t offset);
599 ext2_create(struct v_inode* this, struct v_dnode* dnode, unsigned int itype);
602 ext2_link(struct v_inode* this, struct v_dnode* new_name);
605 ext2_unlink(struct v_inode* this, struct v_dnode* name);
608 ext2_get_symlink(struct v_inode *this, const char **path_out);
611 ext2_set_symlink(struct v_inode *this, const char *target);
613 /* *********** Bitmap *********** */
616 ext2bmp_init(struct ext2_bmp* e_bmp, bbuf_t bmp_buf, unsigned int nr_bits);
619 ext2bmp_check_free(struct ext2_bmp* e_bmp);
622 ext2bmp_alloc_one(struct ext2_bmp* e_bmp);
625 ext2bmp_free_one(struct ext2_bmp* e_bmp, unsigned int pos);
628 ext2bmp_discard(struct ext2_bmp* e_bmp);
630 /* *********** Allocations *********** */
632 #define ALLOC_FAIL -1
635 valid_bmp_slot(int slot)
637 return slot != ALLOC_FAIL;
641 ext2gd_alloc_slot(struct ext2_gdesc* gd, int type_sel);
644 ext2gd_free_slot(struct ext2_gdesc* gd, int type_sel, int slot);
647 ext2gd_alloc_inode(struct ext2_gdesc* gd)
649 return ext2gd_alloc_slot(gd, GDESC_INO_SEL);
653 ext2gd_alloc_block(struct ext2_gdesc* gd)
655 return ext2gd_alloc_slot(gd, GDESC_BLK_SEL);
659 ext2gd_free_inode(struct ext2_gdesc* gd, int slot)
661 ext2gd_free_slot(gd, GDESC_INO_SEL, slot);
665 ext2gd_free_block(struct ext2_gdesc* gd, int slot)
667 ext2gd_free_slot(gd, GDESC_BLK_SEL, slot);
672 * @brief Allocate a free inode
675 * @param hint locality hint
680 ext2ino_alloc(struct v_superblock* vsb,
681 struct ext2_inode* hint, struct ext2_inode** out);
684 * @brief Allocate a free data block
686 * @param inode inode where the data block goes, also used as locality hint
690 ext2db_alloc(struct v_inode* inode, bbuf_t* out);
693 * @brief free an inode
696 * @param hint locality hint
701 ext2ino_free(struct v_inode* inode);
704 * @brief Free a data block
706 * @param inode inode where the data block goes, also used as locality hint
710 ext2db_free(struct v_inode* inode, bbuf_t buf);
713 ext2ino_alloc_slot(struct v_superblock* vsb, struct ext2_gdesc** gd_out);
716 ext2db_alloc_slot(struct v_superblock* vsb, struct ext2_gdesc** gd_out);
719 #endif /* __LUNAIX_EXT2_H */