1 files changed, 353 insertions, 0 deletions

diff --git a/fs/f2fs/node.h b/fs/f2fs/node.h
new file mode 100644
index 000000000000..afdb130f782e
--- /dev/null
+++ b/fs/f2fs/node.h
@@ -0,0 +1,353 @@
+/*
+ * 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 # of free node ids to produce during build_free_nids */
+#define MAX_FREE_NIDS (NAT_ENTRY_PER_BLOCK * FREE_NID_PAGES)
+
+/* maximum readahead size for node during getting data blocks */
+#define MAX_RA_NODE             128
+
+/* maximum cached nat entries to manage memory footprint */
+#define NM_WOUT_THRESHOLD       (64 * NAT_ENTRY_PER_BLOCK)
+
+/* vector size for gang look-up from nat cache that consists of radix tree */
+#define NATVEC_SIZE     64
+
+/*
+ * 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 */
+};
+
+struct nat_entry {
+        struct list_head list;  /* for clean or dirty nat list */
+        bool checkpointed;      /* whether it is checkpointed or not */
+        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 __set_nat_cache_dirty(nm_i, ne)                                 \
+        list_move_tail(&ne->list, &nm_i->dirty_nat_entries);
+#define __clear_nat_cache_dirty(nm_i, ne)                               \
+        list_move_tail(&ne->list, &nm_i->nat_entries);
+#define inc_node_version(version)       (++version)
+
+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;
+}
+
+/*
+ * 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 int next_free_nid(struct f2fs_sb_info *sbi, nid_t *nid)
+{
+        struct f2fs_nm_info *nm_i = NM_I(sbi);
+        struct free_nid *fnid;
+
+        if (nm_i->fcnt <= 0)
+                return -1;
+        spin_lock(&nm_i->free_nid_list_lock);
+        fnid = list_entry(nm_i->free_nid_list.next, struct free_nid, list);
+        *nid = fnid->nid;
+        spin_unlock(&nm_i->free_nid_list_lock);
+        return 0;
+}
+
+/*
+ * 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);
+
+        if (f2fs_test_bit(block_off, nm_i->nat_bitmap))
+                f2fs_clear_bit(block_off, nm_i->nat_bitmap);
+        else
+                f2fs_set_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)
+{
+        void *kaddr = page_address(page);
+        struct f2fs_node *rn = (struct f2fs_node *)kaddr;
+        if (reset)
+                memset(rn, 0, sizeof(*rn));
+        rn->footer.nid = cpu_to_le32(nid);
+        rn->footer.ino = cpu_to_le32(ino);
+        rn->footer.flag = cpu_to_le32(ofs << OFFSET_BIT_SHIFT);
+}
+
+static inline void copy_node_footer(struct page *dst, struct page *src)
+{
+        void *src_addr = page_address(src);
+        void *dst_addr = page_address(dst);
+        struct f2fs_node *src_rn = (struct f2fs_node *)src_addr;
+        struct f2fs_node *dst_rn = (struct f2fs_node *)dst_addr;
+        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_sb_info *sbi = F2FS_SB(page->mapping->host->i_sb);
+        struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
+        void *kaddr = page_address(page);
+        struct f2fs_node *rn = (struct f2fs_node *)kaddr;
+        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)
+{
+        void *kaddr = page_address(node_page);
+        struct f2fs_node *rn = (struct f2fs_node *)kaddr;
+        return le32_to_cpu(rn->footer.ino);
+}
+
+static inline nid_t nid_of_node(struct page *node_page)
+{
+        void *kaddr = page_address(node_page);
+        struct f2fs_node *rn = (struct f2fs_node *)kaddr;
+        return le32_to_cpu(rn->footer.nid);
+}
+
+static inline unsigned int ofs_of_node(struct page *node_page)
+{
+        void *kaddr = page_address(node_page);
+        struct f2fs_node *rn = (struct f2fs_node *)kaddr;
+        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)
+{
+        void *kaddr = page_address(node_page);
+        struct f2fs_node *rn = (struct f2fs_node *)kaddr;
+        return le64_to_cpu(rn->footer.cp_ver);
+}
+
+static inline block_t next_blkaddr_of_node(struct page *node_page)
+{
+        void *kaddr = page_address(node_page);
+        struct f2fs_node *rn = (struct f2fs_node *)kaddr;
+        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 (x(N + 1))
+ */
+static inline bool IS_DNODE(struct page *node_page)
+{
+        unsigned int ofs = ofs_of_node(node_page);
+        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 = (struct f2fs_node *)page_address(p);
+
+        wait_on_page_writeback(p);
+
+        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 = (struct f2fs_node *)page_address(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_cold_file(struct inode *inode)
+{
+        return F2FS_I(inode)->i_advise & FADVISE_COLD_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_cold_node(struct page *page)
+{
+        void *kaddr = page_address(page);
+        struct f2fs_node *rn = (struct f2fs_node *)kaddr;
+        unsigned int flag = le32_to_cpu(rn->footer.flag);
+        return flag & (0x1 << COLD_BIT_SHIFT);
+}
+
+static inline unsigned char is_fsync_dnode(struct page *page)
+{
+        void *kaddr = page_address(page);
+        struct f2fs_node *rn = (struct f2fs_node *)kaddr;
+        unsigned int flag = le32_to_cpu(rn->footer.flag);
+        return flag & (0x1 << FSYNC_BIT_SHIFT);
+}
+
+static inline unsigned char is_dent_dnode(struct page *page)
+{
+        void *kaddr = page_address(page);
+        struct f2fs_node *rn = (struct f2fs_node *)kaddr;
+        unsigned int flag = le32_to_cpu(rn->footer.flag);
+        return flag & (0x1 << DENT_BIT_SHIFT);
+}
+
+static inline void set_cold_node(struct inode *inode, struct page *page)
+{
+        struct f2fs_node *rn = (struct f2fs_node *)page_address(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_fsync_mark(struct page *page, int mark)
+{
+        void *kaddr = page_address(page);
+        struct f2fs_node *rn = (struct f2fs_node *)kaddr;
+        unsigned int flag = le32_to_cpu(rn->footer.flag);
+        if (mark)
+                flag |= (0x1 << FSYNC_BIT_SHIFT);
+        else
+                flag &= ~(0x1 << FSYNC_BIT_SHIFT);
+        rn->footer.flag = cpu_to_le32(flag);
+}
+
+static inline void set_dentry_mark(struct page *page, int mark)
+{
+        void *kaddr = page_address(page);
+        struct f2fs_node *rn = (struct f2fs_node *)kaddr;
+        unsigned int flag = le32_to_cpu(rn->footer.flag);
+        if (mark)
+                flag |= (0x1 << DENT_BIT_SHIFT);
+        else
+                flag &= ~(0x1 << DENT_BIT_SHIFT);
+        rn->footer.flag = cpu_to_le32(flag);
+}