diff options
Diffstat (limited to 'fs/f2fs/node.h')
| -rw-r--r-- | fs/f2fs/node.h | 416 |
1 files changed, 416 insertions, 0 deletions
diff --git a/fs/f2fs/node.h b/fs/f2fs/node.h new file mode 100644 index 000000000..c56026f17 --- /dev/null +++ b/fs/f2fs/node.h @@ -0,0 +1,416 @@ +/* + * fs/f2fs/node.h + * + * Copyright (c) 2012 Samsung Electronics Co., Ltd. + * http://www.samsung.com/ + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +/* start node id of a node block dedicated to the given node id */ +#define START_NID(nid) ((nid / NAT_ENTRY_PER_BLOCK) * NAT_ENTRY_PER_BLOCK) + +/* node block offset on the NAT area dedicated to the given start node id */ +#define NAT_BLOCK_OFFSET(start_nid) (start_nid / NAT_ENTRY_PER_BLOCK) + +/* # of pages to perform readahead before building free nids */ +#define FREE_NID_PAGES 4 + +/* maximum readahead size for node during getting data blocks */ +#define MAX_RA_NODE 128 + +/* control the memory footprint threshold (10MB per 1GB ram) */ +#define DEF_RAM_THRESHOLD 10 + +/* vector size for gang look-up from nat cache that consists of radix tree */ +#define NATVEC_SIZE 64 +#define SETVEC_SIZE 32 + +/* return value for read_node_page */ +#define LOCKED_PAGE 1 + +/* For flag in struct node_info */ +enum { + IS_CHECKPOINTED, /* is it checkpointed before? */ + HAS_FSYNCED_INODE, /* is the inode fsynced before? */ + HAS_LAST_FSYNC, /* has the latest node fsync mark? */ + IS_DIRTY, /* this nat entry is dirty? */ +}; + +/* + * For node information + */ +struct node_info { + nid_t nid; /* node id */ + nid_t ino; /* inode number of the node's owner */ + block_t blk_addr; /* block address of the node */ + unsigned char version; /* version of the node */ + unsigned char flag; /* for node information bits */ +}; + +struct nat_entry { + struct list_head list; /* for clean or dirty nat list */ + struct node_info ni; /* in-memory node information */ +}; + +#define nat_get_nid(nat) (nat->ni.nid) +#define nat_set_nid(nat, n) (nat->ni.nid = n) +#define nat_get_blkaddr(nat) (nat->ni.blk_addr) +#define nat_set_blkaddr(nat, b) (nat->ni.blk_addr = b) +#define nat_get_ino(nat) (nat->ni.ino) +#define nat_set_ino(nat, i) (nat->ni.ino = i) +#define nat_get_version(nat) (nat->ni.version) +#define nat_set_version(nat, v) (nat->ni.version = v) + +#define inc_node_version(version) (++version) + +static inline void copy_node_info(struct node_info *dst, + struct node_info *src) +{ + dst->nid = src->nid; + dst->ino = src->ino; + dst->blk_addr = src->blk_addr; + dst->version = src->version; + /* should not copy flag here */ +} + +static inline void set_nat_flag(struct nat_entry *ne, + unsigned int type, bool set) +{ + unsigned char mask = 0x01 << type; + if (set) + ne->ni.flag |= mask; + else + ne->ni.flag &= ~mask; +} + +static inline bool get_nat_flag(struct nat_entry *ne, unsigned int type) +{ + unsigned char mask = 0x01 << type; + return ne->ni.flag & mask; +} + +static inline void nat_reset_flag(struct nat_entry *ne) +{ + /* these states can be set only after checkpoint was done */ + set_nat_flag(ne, IS_CHECKPOINTED, true); + set_nat_flag(ne, HAS_FSYNCED_INODE, false); + set_nat_flag(ne, HAS_LAST_FSYNC, true); +} + +static inline void node_info_from_raw_nat(struct node_info *ni, + struct f2fs_nat_entry *raw_ne) +{ + ni->ino = le32_to_cpu(raw_ne->ino); + ni->blk_addr = le32_to_cpu(raw_ne->block_addr); + ni->version = raw_ne->version; +} + +static inline void raw_nat_from_node_info(struct f2fs_nat_entry *raw_ne, + struct node_info *ni) +{ + raw_ne->ino = cpu_to_le32(ni->ino); + raw_ne->block_addr = cpu_to_le32(ni->blk_addr); + raw_ne->version = ni->version; +} + +enum mem_type { + FREE_NIDS, /* indicates the free nid list */ + NAT_ENTRIES, /* indicates the cached nat entry */ + DIRTY_DENTS, /* indicates dirty dentry pages */ + INO_ENTRIES, /* indicates inode entries */ + EXTENT_CACHE, /* indicates extent cache */ + BASE_CHECK, /* check kernel status */ +}; + +struct nat_entry_set { + struct list_head set_list; /* link with other nat sets */ + struct list_head entry_list; /* link with dirty nat entries */ + nid_t set; /* set number*/ + unsigned int entry_cnt; /* the # of nat entries in set */ +}; + +/* + * For free nid mangement + */ +enum nid_state { + NID_NEW, /* newly added to free nid list */ + NID_ALLOC /* it is allocated */ +}; + +struct free_nid { + struct list_head list; /* for free node id list */ + nid_t nid; /* node id */ + int state; /* in use or not: NID_NEW or NID_ALLOC */ +}; + +static inline void next_free_nid(struct f2fs_sb_info *sbi, nid_t *nid) +{ + struct f2fs_nm_info *nm_i = NM_I(sbi); + struct free_nid *fnid; + + spin_lock(&nm_i->free_nid_list_lock); + if (nm_i->fcnt <= 0) { + spin_unlock(&nm_i->free_nid_list_lock); + return; + } + fnid = list_entry(nm_i->free_nid_list.next, struct free_nid, list); + *nid = fnid->nid; + spin_unlock(&nm_i->free_nid_list_lock); +} + +/* + * inline functions + */ +static inline void get_nat_bitmap(struct f2fs_sb_info *sbi, void *addr) +{ + struct f2fs_nm_info *nm_i = NM_I(sbi); + memcpy(addr, nm_i->nat_bitmap, nm_i->bitmap_size); +} + +static inline pgoff_t current_nat_addr(struct f2fs_sb_info *sbi, nid_t start) +{ + struct f2fs_nm_info *nm_i = NM_I(sbi); + pgoff_t block_off; + pgoff_t block_addr; + int seg_off; + + block_off = NAT_BLOCK_OFFSET(start); + seg_off = block_off >> sbi->log_blocks_per_seg; + + block_addr = (pgoff_t)(nm_i->nat_blkaddr + + (seg_off << sbi->log_blocks_per_seg << 1) + + (block_off & ((1 << sbi->log_blocks_per_seg) - 1))); + + if (f2fs_test_bit(block_off, nm_i->nat_bitmap)) + block_addr += sbi->blocks_per_seg; + + return block_addr; +} + +static inline pgoff_t next_nat_addr(struct f2fs_sb_info *sbi, + pgoff_t block_addr) +{ + struct f2fs_nm_info *nm_i = NM_I(sbi); + + block_addr -= nm_i->nat_blkaddr; + if ((block_addr >> sbi->log_blocks_per_seg) % 2) + block_addr -= sbi->blocks_per_seg; + else + block_addr += sbi->blocks_per_seg; + + return block_addr + nm_i->nat_blkaddr; +} + +static inline void set_to_next_nat(struct f2fs_nm_info *nm_i, nid_t start_nid) +{ + unsigned int block_off = NAT_BLOCK_OFFSET(start_nid); + + f2fs_change_bit(block_off, nm_i->nat_bitmap); +} + +static inline void fill_node_footer(struct page *page, nid_t nid, + nid_t ino, unsigned int ofs, bool reset) +{ + struct f2fs_node *rn = F2FS_NODE(page); + unsigned int old_flag = 0; + + if (reset) + memset(rn, 0, sizeof(*rn)); + else + old_flag = le32_to_cpu(rn->footer.flag); + + rn->footer.nid = cpu_to_le32(nid); + rn->footer.ino = cpu_to_le32(ino); + + /* should remain old flag bits such as COLD_BIT_SHIFT */ + rn->footer.flag = cpu_to_le32((ofs << OFFSET_BIT_SHIFT) | + (old_flag & OFFSET_BIT_MASK)); +} + +static inline void copy_node_footer(struct page *dst, struct page *src) +{ + struct f2fs_node *src_rn = F2FS_NODE(src); + struct f2fs_node *dst_rn = F2FS_NODE(dst); + memcpy(&dst_rn->footer, &src_rn->footer, sizeof(struct node_footer)); +} + +static inline void fill_node_footer_blkaddr(struct page *page, block_t blkaddr) +{ + struct f2fs_checkpoint *ckpt = F2FS_CKPT(F2FS_P_SB(page)); + struct f2fs_node *rn = F2FS_NODE(page); + + rn->footer.cp_ver = ckpt->checkpoint_ver; + rn->footer.next_blkaddr = cpu_to_le32(blkaddr); +} + +static inline nid_t ino_of_node(struct page *node_page) +{ + struct f2fs_node *rn = F2FS_NODE(node_page); + return le32_to_cpu(rn->footer.ino); +} + +static inline nid_t nid_of_node(struct page *node_page) +{ + struct f2fs_node *rn = F2FS_NODE(node_page); + return le32_to_cpu(rn->footer.nid); +} + +static inline unsigned int ofs_of_node(struct page *node_page) +{ + struct f2fs_node *rn = F2FS_NODE(node_page); + unsigned flag = le32_to_cpu(rn->footer.flag); + return flag >> OFFSET_BIT_SHIFT; +} + +static inline unsigned long long cpver_of_node(struct page *node_page) +{ + struct f2fs_node *rn = F2FS_NODE(node_page); + return le64_to_cpu(rn->footer.cp_ver); +} + +static inline block_t next_blkaddr_of_node(struct page *node_page) +{ + struct f2fs_node *rn = F2FS_NODE(node_page); + return le32_to_cpu(rn->footer.next_blkaddr); +} + +/* + * f2fs assigns the following node offsets described as (num). + * N = NIDS_PER_BLOCK + * + * Inode block (0) + * |- direct node (1) + * |- direct node (2) + * |- indirect node (3) + * | `- direct node (4 => 4 + N - 1) + * |- indirect node (4 + N) + * | `- direct node (5 + N => 5 + 2N - 1) + * `- double indirect node (5 + 2N) + * `- indirect node (6 + 2N) + * `- direct node + * ...... + * `- indirect node ((6 + 2N) + x(N + 1)) + * `- direct node + * ...... + * `- indirect node ((6 + 2N) + (N - 1)(N + 1)) + * `- direct node + */ +static inline bool IS_DNODE(struct page *node_page) +{ + unsigned int ofs = ofs_of_node(node_page); + + if (f2fs_has_xattr_block(ofs)) + return false; + + if (ofs == 3 || ofs == 4 + NIDS_PER_BLOCK || + ofs == 5 + 2 * NIDS_PER_BLOCK) + return false; + if (ofs >= 6 + 2 * NIDS_PER_BLOCK) { + ofs -= 6 + 2 * NIDS_PER_BLOCK; + if (!((long int)ofs % (NIDS_PER_BLOCK + 1))) + return false; + } + return true; +} + +static inline void set_nid(struct page *p, int off, nid_t nid, bool i) +{ + struct f2fs_node *rn = F2FS_NODE(p); + + f2fs_wait_on_page_writeback(p, NODE); + + if (i) + rn->i.i_nid[off - NODE_DIR1_BLOCK] = cpu_to_le32(nid); + else + rn->in.nid[off] = cpu_to_le32(nid); + set_page_dirty(p); +} + +static inline nid_t get_nid(struct page *p, int off, bool i) +{ + struct f2fs_node *rn = F2FS_NODE(p); + + if (i) + return le32_to_cpu(rn->i.i_nid[off - NODE_DIR1_BLOCK]); + return le32_to_cpu(rn->in.nid[off]); +} + +/* + * Coldness identification: + * - Mark cold files in f2fs_inode_info + * - Mark cold node blocks in their node footer + * - Mark cold data pages in page cache + */ +static inline int is_file(struct inode *inode, int type) +{ + return F2FS_I(inode)->i_advise & type; +} + +static inline void set_file(struct inode *inode, int type) +{ + F2FS_I(inode)->i_advise |= type; +} + +static inline void clear_file(struct inode *inode, int type) +{ + F2FS_I(inode)->i_advise &= ~type; +} + +#define file_is_cold(inode) is_file(inode, FADVISE_COLD_BIT) +#define file_wrong_pino(inode) is_file(inode, FADVISE_LOST_PINO_BIT) +#define file_set_cold(inode) set_file(inode, FADVISE_COLD_BIT) +#define file_lost_pino(inode) set_file(inode, FADVISE_LOST_PINO_BIT) +#define file_clear_cold(inode) clear_file(inode, FADVISE_COLD_BIT) +#define file_got_pino(inode) clear_file(inode, FADVISE_LOST_PINO_BIT) + +static inline int is_cold_data(struct page *page) +{ + return PageChecked(page); +} + +static inline void set_cold_data(struct page *page) +{ + SetPageChecked(page); +} + +static inline void clear_cold_data(struct page *page) +{ + ClearPageChecked(page); +} + +static inline int is_node(struct page *page, int type) +{ + struct f2fs_node *rn = F2FS_NODE(page); + return le32_to_cpu(rn->footer.flag) & (1 << type); +} + +#define is_cold_node(page) is_node(page, COLD_BIT_SHIFT) +#define is_fsync_dnode(page) is_node(page, FSYNC_BIT_SHIFT) +#define is_dent_dnode(page) is_node(page, DENT_BIT_SHIFT) + +static inline void set_cold_node(struct inode *inode, struct page *page) +{ + struct f2fs_node *rn = F2FS_NODE(page); + unsigned int flag = le32_to_cpu(rn->footer.flag); + + if (S_ISDIR(inode->i_mode)) + flag &= ~(0x1 << COLD_BIT_SHIFT); + else + flag |= (0x1 << COLD_BIT_SHIFT); + rn->footer.flag = cpu_to_le32(flag); +} + +static inline void set_mark(struct page *page, int mark, int type) +{ + struct f2fs_node *rn = F2FS_NODE(page); + unsigned int flag = le32_to_cpu(rn->footer.flag); + if (mark) + flag |= (0x1 << type); + else + flag &= ~(0x1 << type); + rn->footer.flag = cpu_to_le32(flag); +} +#define set_dentry_mark(page, mark) set_mark(page, mark, DENT_BIT_SHIFT) +#define set_fsync_mark(page, mark) set_mark(page, mark, FSYNC_BIT_SHIFT) |