377 lines
10 KiB
C
377 lines
10 KiB
C
/*
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* fs/f2fs/node.h
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*
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* Copyright (c) 2012 Samsung Electronics Co., Ltd.
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* http://www.samsung.com/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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/* start node id of a node block dedicated to the given node id */
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#define START_NID(nid) ((nid / NAT_ENTRY_PER_BLOCK) * NAT_ENTRY_PER_BLOCK)
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/* node block offset on the NAT area dedicated to the given start node id */
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#define NAT_BLOCK_OFFSET(start_nid) (start_nid / NAT_ENTRY_PER_BLOCK)
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/* # of pages to perform readahead before building free nids */
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#define FREE_NID_PAGES 4
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/* maximum readahead size for node during getting data blocks */
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#define MAX_RA_NODE 128
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/* control the memory footprint threshold (10MB per 1GB ram) */
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#define DEF_RAM_THRESHOLD 10
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/* vector size for gang look-up from nat cache that consists of radix tree */
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#define NATVEC_SIZE 64
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/* return value for read_node_page */
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#define LOCKED_PAGE 1
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/*
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* For node information
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*/
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struct node_info {
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nid_t nid; /* node id */
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nid_t ino; /* inode number of the node's owner */
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block_t blk_addr; /* block address of the node */
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unsigned char version; /* version of the node */
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};
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struct nat_entry {
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struct list_head list; /* for clean or dirty nat list */
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bool checkpointed; /* whether it is checkpointed or not */
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bool fsync_done; /* whether the latest node has fsync mark */
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struct node_info ni; /* in-memory node information */
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};
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#define nat_get_nid(nat) (nat->ni.nid)
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#define nat_set_nid(nat, n) (nat->ni.nid = n)
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#define nat_get_blkaddr(nat) (nat->ni.blk_addr)
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#define nat_set_blkaddr(nat, b) (nat->ni.blk_addr = b)
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#define nat_get_ino(nat) (nat->ni.ino)
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#define nat_set_ino(nat, i) (nat->ni.ino = i)
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#define nat_get_version(nat) (nat->ni.version)
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#define nat_set_version(nat, v) (nat->ni.version = v)
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#define __set_nat_cache_dirty(nm_i, ne) \
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do { \
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ne->checkpointed = false; \
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list_move_tail(&ne->list, &nm_i->dirty_nat_entries); \
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} while (0)
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#define __clear_nat_cache_dirty(nm_i, ne) \
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do { \
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ne->checkpointed = true; \
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list_move_tail(&ne->list, &nm_i->nat_entries); \
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} while (0)
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#define inc_node_version(version) (++version)
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static inline void node_info_from_raw_nat(struct node_info *ni,
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struct f2fs_nat_entry *raw_ne)
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{
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ni->ino = le32_to_cpu(raw_ne->ino);
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ni->blk_addr = le32_to_cpu(raw_ne->block_addr);
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ni->version = raw_ne->version;
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}
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static inline void raw_nat_from_node_info(struct f2fs_nat_entry *raw_ne,
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struct node_info *ni)
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{
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raw_ne->ino = cpu_to_le32(ni->ino);
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raw_ne->block_addr = cpu_to_le32(ni->blk_addr);
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raw_ne->version = ni->version;
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}
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enum mem_type {
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FREE_NIDS, /* indicates the free nid list */
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NAT_ENTRIES, /* indicates the cached nat entry */
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DIRTY_DENTS /* indicates dirty dentry pages */
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};
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struct nat_entry_set {
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struct list_head set_list; /* link with all nat sets */
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struct list_head entry_list; /* link with dirty nat entries */
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nid_t start_nid; /* start nid of nats in set */
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unsigned int entry_cnt; /* the # of nat entries in set */
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};
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/*
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* For free nid mangement
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*/
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enum nid_state {
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NID_NEW, /* newly added to free nid list */
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NID_ALLOC /* it is allocated */
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};
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struct free_nid {
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struct list_head list; /* for free node id list */
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nid_t nid; /* node id */
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int state; /* in use or not: NID_NEW or NID_ALLOC */
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};
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static inline int next_free_nid(struct f2fs_sb_info *sbi, nid_t *nid)
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{
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struct f2fs_nm_info *nm_i = NM_I(sbi);
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struct free_nid *fnid;
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if (nm_i->fcnt <= 0)
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return -1;
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spin_lock(&nm_i->free_nid_list_lock);
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fnid = list_entry(nm_i->free_nid_list.next, struct free_nid, list);
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*nid = fnid->nid;
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spin_unlock(&nm_i->free_nid_list_lock);
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return 0;
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}
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/*
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* inline functions
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*/
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static inline void get_nat_bitmap(struct f2fs_sb_info *sbi, void *addr)
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{
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struct f2fs_nm_info *nm_i = NM_I(sbi);
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memcpy(addr, nm_i->nat_bitmap, nm_i->bitmap_size);
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}
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static inline pgoff_t current_nat_addr(struct f2fs_sb_info *sbi, nid_t start)
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{
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struct f2fs_nm_info *nm_i = NM_I(sbi);
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pgoff_t block_off;
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pgoff_t block_addr;
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int seg_off;
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block_off = NAT_BLOCK_OFFSET(start);
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seg_off = block_off >> sbi->log_blocks_per_seg;
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block_addr = (pgoff_t)(nm_i->nat_blkaddr +
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(seg_off << sbi->log_blocks_per_seg << 1) +
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(block_off & ((1 << sbi->log_blocks_per_seg) - 1)));
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if (f2fs_test_bit(block_off, nm_i->nat_bitmap))
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block_addr += sbi->blocks_per_seg;
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return block_addr;
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}
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static inline pgoff_t next_nat_addr(struct f2fs_sb_info *sbi,
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pgoff_t block_addr)
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{
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struct f2fs_nm_info *nm_i = NM_I(sbi);
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block_addr -= nm_i->nat_blkaddr;
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if ((block_addr >> sbi->log_blocks_per_seg) % 2)
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block_addr -= sbi->blocks_per_seg;
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else
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block_addr += sbi->blocks_per_seg;
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return block_addr + nm_i->nat_blkaddr;
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}
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static inline void set_to_next_nat(struct f2fs_nm_info *nm_i, nid_t start_nid)
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{
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unsigned int block_off = NAT_BLOCK_OFFSET(start_nid);
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if (f2fs_test_bit(block_off, nm_i->nat_bitmap))
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f2fs_clear_bit(block_off, nm_i->nat_bitmap);
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else
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f2fs_set_bit(block_off, nm_i->nat_bitmap);
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}
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static inline void fill_node_footer(struct page *page, nid_t nid,
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nid_t ino, unsigned int ofs, bool reset)
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{
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struct f2fs_node *rn = F2FS_NODE(page);
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if (reset)
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memset(rn, 0, sizeof(*rn));
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rn->footer.nid = cpu_to_le32(nid);
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rn->footer.ino = cpu_to_le32(ino);
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rn->footer.flag = cpu_to_le32(ofs << OFFSET_BIT_SHIFT);
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}
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static inline void copy_node_footer(struct page *dst, struct page *src)
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{
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struct f2fs_node *src_rn = F2FS_NODE(src);
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struct f2fs_node *dst_rn = F2FS_NODE(dst);
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memcpy(&dst_rn->footer, &src_rn->footer, sizeof(struct node_footer));
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}
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static inline void fill_node_footer_blkaddr(struct page *page, block_t blkaddr)
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{
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struct f2fs_sb_info *sbi = F2FS_SB(page->mapping->host->i_sb);
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struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
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struct f2fs_node *rn = F2FS_NODE(page);
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rn->footer.cp_ver = ckpt->checkpoint_ver;
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rn->footer.next_blkaddr = cpu_to_le32(blkaddr);
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}
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static inline nid_t ino_of_node(struct page *node_page)
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{
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struct f2fs_node *rn = F2FS_NODE(node_page);
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return le32_to_cpu(rn->footer.ino);
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}
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static inline nid_t nid_of_node(struct page *node_page)
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{
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struct f2fs_node *rn = F2FS_NODE(node_page);
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return le32_to_cpu(rn->footer.nid);
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}
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static inline unsigned int ofs_of_node(struct page *node_page)
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{
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struct f2fs_node *rn = F2FS_NODE(node_page);
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unsigned flag = le32_to_cpu(rn->footer.flag);
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return flag >> OFFSET_BIT_SHIFT;
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}
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static inline unsigned long long cpver_of_node(struct page *node_page)
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{
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struct f2fs_node *rn = F2FS_NODE(node_page);
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return le64_to_cpu(rn->footer.cp_ver);
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}
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static inline block_t next_blkaddr_of_node(struct page *node_page)
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{
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struct f2fs_node *rn = F2FS_NODE(node_page);
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return le32_to_cpu(rn->footer.next_blkaddr);
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}
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/*
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* f2fs assigns the following node offsets described as (num).
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* N = NIDS_PER_BLOCK
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*
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* Inode block (0)
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* |- direct node (1)
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* |- direct node (2)
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* |- indirect node (3)
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* | `- direct node (4 => 4 + N - 1)
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* |- indirect node (4 + N)
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* | `- direct node (5 + N => 5 + 2N - 1)
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* `- double indirect node (5 + 2N)
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* `- indirect node (6 + 2N)
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* `- direct node
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* ......
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* `- indirect node ((6 + 2N) + x(N + 1))
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* `- direct node
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* ......
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* `- indirect node ((6 + 2N) + (N - 1)(N + 1))
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* `- direct node
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*/
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static inline bool IS_DNODE(struct page *node_page)
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{
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unsigned int ofs = ofs_of_node(node_page);
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if (f2fs_has_xattr_block(ofs))
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return false;
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if (ofs == 3 || ofs == 4 + NIDS_PER_BLOCK ||
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ofs == 5 + 2 * NIDS_PER_BLOCK)
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return false;
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if (ofs >= 6 + 2 * NIDS_PER_BLOCK) {
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ofs -= 6 + 2 * NIDS_PER_BLOCK;
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if (!((long int)ofs % (NIDS_PER_BLOCK + 1)))
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return false;
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}
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return true;
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}
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static inline void set_nid(struct page *p, int off, nid_t nid, bool i)
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{
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struct f2fs_node *rn = F2FS_NODE(p);
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f2fs_wait_on_page_writeback(p, NODE);
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if (i)
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rn->i.i_nid[off - NODE_DIR1_BLOCK] = cpu_to_le32(nid);
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else
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rn->in.nid[off] = cpu_to_le32(nid);
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set_page_dirty(p);
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}
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static inline nid_t get_nid(struct page *p, int off, bool i)
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{
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struct f2fs_node *rn = F2FS_NODE(p);
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if (i)
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return le32_to_cpu(rn->i.i_nid[off - NODE_DIR1_BLOCK]);
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return le32_to_cpu(rn->in.nid[off]);
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}
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/*
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* Coldness identification:
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* - Mark cold files in f2fs_inode_info
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* - Mark cold node blocks in their node footer
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* - Mark cold data pages in page cache
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*/
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static inline int is_file(struct inode *inode, int type)
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{
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return F2FS_I(inode)->i_advise & type;
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}
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static inline void set_file(struct inode *inode, int type)
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{
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F2FS_I(inode)->i_advise |= type;
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}
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static inline void clear_file(struct inode *inode, int type)
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{
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F2FS_I(inode)->i_advise &= ~type;
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}
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#define file_is_cold(inode) is_file(inode, FADVISE_COLD_BIT)
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#define file_wrong_pino(inode) is_file(inode, FADVISE_LOST_PINO_BIT)
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#define file_set_cold(inode) set_file(inode, FADVISE_COLD_BIT)
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#define file_lost_pino(inode) set_file(inode, FADVISE_LOST_PINO_BIT)
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#define file_clear_cold(inode) clear_file(inode, FADVISE_COLD_BIT)
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#define file_got_pino(inode) clear_file(inode, FADVISE_LOST_PINO_BIT)
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static inline int is_cold_data(struct page *page)
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{
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return PageChecked(page);
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}
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static inline void set_cold_data(struct page *page)
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{
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SetPageChecked(page);
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}
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static inline void clear_cold_data(struct page *page)
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{
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ClearPageChecked(page);
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}
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static inline int is_node(struct page *page, int type)
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{
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struct f2fs_node *rn = F2FS_NODE(page);
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return le32_to_cpu(rn->footer.flag) & (1 << type);
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}
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#define is_cold_node(page) is_node(page, COLD_BIT_SHIFT)
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#define is_fsync_dnode(page) is_node(page, FSYNC_BIT_SHIFT)
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#define is_dent_dnode(page) is_node(page, DENT_BIT_SHIFT)
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static inline void set_cold_node(struct inode *inode, struct page *page)
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{
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struct f2fs_node *rn = F2FS_NODE(page);
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unsigned int flag = le32_to_cpu(rn->footer.flag);
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if (S_ISDIR(inode->i_mode))
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flag &= ~(0x1 << COLD_BIT_SHIFT);
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else
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flag |= (0x1 << COLD_BIT_SHIFT);
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rn->footer.flag = cpu_to_le32(flag);
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}
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static inline void set_mark(struct page *page, int mark, int type)
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{
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struct f2fs_node *rn = F2FS_NODE(page);
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unsigned int flag = le32_to_cpu(rn->footer.flag);
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if (mark)
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flag |= (0x1 << type);
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else
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flag &= ~(0x1 << type);
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rn->footer.flag = cpu_to_le32(flag);
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}
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#define set_dentry_mark(page, mark) set_mark(page, mark, DENT_BIT_SHIFT)
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#define set_fsync_mark(page, mark) set_mark(page, mark, FSYNC_BIT_SHIFT)
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