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Subject[PATCH v7 02/24] erofs: add erofs in-memory stuffs
Date
 - erofs_sb_info:
contains erofs-specific in-memory information.

- erofs_vnode:
contains vfs_inode and other fs-specific information.
same as super block, the only one in-memory definition exists.

- erofs_map_blocks
Logical to physical block mapping, used by erofs_map_blocks().

Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
---
fs/erofs/internal.h | 355 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 355 insertions(+)
create mode 100644 fs/erofs/internal.h

diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
new file mode 100644
index 000000000000..f20e52b8653a
--- /dev/null
+++ b/fs/erofs/internal.h
@@ -0,0 +1,355 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * linux/fs/erofs/internal.h
+ *
+ * Copyright (C) 2017-2018 HUAWEI, Inc.
+ * http://www.huawei.com/
+ * Created by Gao Xiang <gaoxiang25@huawei.com>
+ */
+#ifndef __EROFS_INTERNAL_H
+#define __EROFS_INTERNAL_H
+
+#include <linux/fs.h>
+#include <linux/dcache.h>
+#include <linux/mm.h>
+#include <linux/pagemap.h>
+#include <linux/bio.h>
+#include <linux/buffer_head.h>
+#include <linux/magic.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include "erofs_fs.h"
+
+/* redefine pr_fmt "erofs: " */
+#undef pr_fmt
+#define pr_fmt(fmt) "erofs: " fmt
+
+#define errln(x, ...) pr_err(x "\n", ##__VA_ARGS__)
+#define infoln(x, ...) pr_info(x "\n", ##__VA_ARGS__)
+#ifdef CONFIG_EROFS_FS_DEBUG
+#define debugln(x, ...) pr_debug(x "\n", ##__VA_ARGS__)
+#define DBG_BUGON BUG_ON
+#else
+#define debugln(x, ...) ((void)0)
+#define DBG_BUGON(x) ((void)(x))
+#endif /* !CONFIG_EROFS_FS_DEBUG */
+
+enum {
+ FAULT_KMALLOC,
+ FAULT_READ_IO,
+ FAULT_MAX,
+};
+
+#ifdef CONFIG_EROFS_FAULT_INJECTION
+extern const char *erofs_fault_name[FAULT_MAX];
+#define IS_FAULT_SET(fi, type) ((fi)->inject_type & (1 << (type)))
+
+struct erofs_fault_info {
+ atomic_t inject_ops;
+ unsigned int inject_rate;
+ unsigned int inject_type;
+};
+#endif /* CONFIG_EROFS_FAULT_INJECTION */
+
+/* EROFS_SUPER_MAGIC_V1 to represent the whole file system */
+#define EROFS_SUPER_MAGIC EROFS_SUPER_MAGIC_V1
+
+typedef u64 erofs_nid_t;
+typedef u64 erofs_off_t;
+/* data type for filesystem-wide blocks number */
+typedef u32 erofs_blk_t;
+
+struct erofs_sb_info {
+ u32 blocks;
+ u32 meta_blkaddr;
+
+ /* inode slot unit size in bit shift */
+ unsigned char islotbits;
+
+ u32 build_time_nsec;
+ u64 build_time;
+
+ /* what we really care is nid, rather than ino.. */
+ erofs_nid_t root_nid;
+ /* used for statfs, f_files - f_favail */
+ u64 inos;
+
+ u8 uuid[16]; /* 128-bit uuid for volume */
+ u8 volume_name[16]; /* volume name */
+ u32 requirements;
+
+ unsigned int mount_opt;
+
+#ifdef CONFIG_EROFS_FAULT_INJECTION
+ struct erofs_fault_info fault_info; /* For fault injection */
+#endif
+};
+
+#ifdef CONFIG_EROFS_FAULT_INJECTION
+#define erofs_show_injection_info(type) \
+ infoln("inject %s in %s of %pS", erofs_fault_name[type], \
+ __func__, __builtin_return_address(0))
+
+static inline bool time_to_inject(struct erofs_sb_info *sbi, int type)
+{
+ struct erofs_fault_info *ffi = &sbi->fault_info;
+
+ if (!ffi->inject_rate)
+ return false;
+
+ if (!IS_FAULT_SET(ffi, type))
+ return false;
+
+ atomic_inc(&ffi->inject_ops);
+ if (atomic_read(&ffi->inject_ops) >= ffi->inject_rate) {
+ atomic_set(&ffi->inject_ops, 0);
+ return true;
+ }
+ return false;
+}
+#else
+static inline bool time_to_inject(struct erofs_sb_info *sbi, int type)
+{
+ return false;
+}
+
+static inline void erofs_show_injection_info(int type)
+{
+}
+#endif /* !CONFIG_EROFS_FAULT_INJECTION */
+
+static inline void *erofs_kmalloc(struct erofs_sb_info *sbi,
+ size_t size, gfp_t flags)
+{
+ if (time_to_inject(sbi, FAULT_KMALLOC)) {
+ erofs_show_injection_info(FAULT_KMALLOC);
+ return NULL;
+ }
+ return kmalloc(size, flags);
+}
+
+#define EROFS_SB(sb) ((struct erofs_sb_info *)(sb)->s_fs_info)
+#define EROFS_I_SB(inode) ((struct erofs_sb_info *)(inode)->i_sb->s_fs_info)
+
+/* Mount flags set via mount options or defaults */
+#define EROFS_MOUNT_FAULT_INJECTION 0x00000040
+
+#define clear_opt(sbi, option) ((sbi)->mount_opt &= ~EROFS_MOUNT_##option)
+#define set_opt(sbi, option) ((sbi)->mount_opt |= EROFS_MOUNT_##option)
+#define test_opt(sbi, option) ((sbi)->mount_opt & EROFS_MOUNT_##option)
+
+/* we strictly follow PAGE_SIZE and no buffer head yet */
+#define LOG_BLOCK_SIZE PAGE_SHIFT
+
+#undef LOG_SECTORS_PER_BLOCK
+#define LOG_SECTORS_PER_BLOCK (PAGE_SHIFT - 9)
+
+#undef SECTORS_PER_BLOCK
+#define SECTORS_PER_BLOCK (1 << SECTORS_PER_BLOCK)
+
+#define EROFS_BLKSIZ (1 << LOG_BLOCK_SIZE)
+
+#if (EROFS_BLKSIZ % 4096 || !EROFS_BLKSIZ)
+#error erofs cannot be used in this platform
+#endif
+
+#define EROFS_IO_MAX_RETRIES_NOFAIL 5
+
+#define ROOT_NID(sb) ((sb)->root_nid)
+
+#define erofs_blknr(addr) ((addr) / EROFS_BLKSIZ)
+#define erofs_blkoff(addr) ((addr) % EROFS_BLKSIZ)
+#define blknr_to_addr(nr) ((erofs_off_t)(nr) * EROFS_BLKSIZ)
+
+static inline erofs_off_t iloc(struct erofs_sb_info *sbi, erofs_nid_t nid)
+{
+ return blknr_to_addr(sbi->meta_blkaddr) + (nid << sbi->islotbits);
+}
+
+struct erofs_vnode {
+ erofs_nid_t nid;
+
+ unsigned char datamode;
+ unsigned char inode_isize;
+ unsigned short xattr_isize;
+
+ erofs_blk_t raw_blkaddr;
+ /* the corresponding vfs inode */
+ struct inode vfs_inode;
+};
+
+#define EROFS_V(ptr) \
+ container_of(ptr, struct erofs_vnode, vfs_inode)
+
+#define __inode_advise(x, bit, bits) \
+ (((x) >> (bit)) & ((1 << (bits)) - 1))
+
+#define __inode_version(advise) \
+ __inode_advise(advise, EROFS_I_VERSION_BIT, \
+ EROFS_I_VERSION_BITS)
+
+#define __inode_data_mapping(advise) \
+ __inode_advise(advise, EROFS_I_DATA_MAPPING_BIT,\
+ EROFS_I_DATA_MAPPING_BITS)
+
+static inline unsigned long inode_datablocks(struct inode *inode)
+{
+ /* since i_size cannot be changed */
+ return DIV_ROUND_UP(inode->i_size, EROFS_BLKSIZ);
+}
+
+static inline bool is_inode_layout_compression(struct inode *inode)
+{
+ return erofs_inode_is_data_compressed(EROFS_V(inode)->datamode);
+}
+
+static inline bool is_inode_flat_inline(struct inode *inode)
+{
+ return EROFS_V(inode)->datamode == EROFS_INODE_FLAT_INLINE;
+}
+
+extern const struct super_operations erofs_sops;
+
+extern const struct address_space_operations erofs_raw_access_aops;
+
+/*
+ * Logical to physical block mapping, used by erofs_map_blocks()
+ *
+ * Different with other file systems, it is used for 2 access modes:
+ *
+ * 1) RAW access mode:
+ *
+ * Users pass a valid (m_lblk, m_lofs -- usually 0) pair,
+ * and get the valid m_pblk, m_pofs and the longest m_len(in bytes).
+ *
+ * Note that m_lblk in the RAW access mode refers to the number of
+ * the compressed ondisk block rather than the uncompressed
+ * in-memory block for the compressed file.
+ *
+ * m_pofs equals to m_lofs except for the inline data page.
+ *
+ * 2) Normal access mode:
+ *
+ * If the inode is not compressed, it has no difference with
+ * the RAW access mode. However, if the inode is compressed,
+ * users should pass a valid (m_lblk, m_lofs) pair, and get
+ * the needed m_pblk, m_pofs, m_len to get the compressed data
+ * and the updated m_lblk, m_lofs which indicates the start
+ * of the corresponding uncompressed data in the file.
+ */
+enum {
+ BH_Zipped = BH_PrivateStart,
+ BH_FullMapped,
+};
+
+/* Has a disk mapping */
+#define EROFS_MAP_MAPPED (1 << BH_Mapped)
+/* Located in metadata (could be copied from bd_inode) */
+#define EROFS_MAP_META (1 << BH_Meta)
+
+struct erofs_map_blocks {
+ erofs_off_t m_pa, m_la;
+ u64 m_plen, m_llen;
+
+ unsigned int m_flags;
+
+ struct page *mpage;
+};
+
+/* Flags used by erofs_map_blocks() */
+#define EROFS_GET_BLOCKS_RAW 0x0001
+
+/* data.c */
+static inline struct bio *erofs_grab_bio(struct super_block *sb,
+ erofs_blk_t blkaddr,
+ unsigned int nr_pages,
+ void *bi_private, bio_end_io_t endio,
+ bool nofail)
+{
+ const gfp_t gfp = GFP_NOIO;
+ struct bio *bio;
+
+ do {
+ if (nr_pages == 1) {
+ bio = bio_alloc(gfp | (nofail ? __GFP_NOFAIL : 0), 1);
+ if (unlikely(!bio)) {
+ DBG_BUGON(nofail);
+ return ERR_PTR(-ENOMEM);
+ }
+ break;
+ }
+ bio = bio_alloc(gfp, nr_pages);
+ nr_pages /= 2;
+ } while (unlikely(!bio));
+
+ bio->bi_end_io = endio;
+ bio_set_dev(bio, sb->s_bdev);
+ bio->bi_iter.bi_sector = (sector_t)blkaddr << LOG_SECTORS_PER_BLOCK;
+ bio->bi_private = bi_private;
+ return bio;
+}
+
+static inline void __submit_bio(struct bio *bio, unsigned int op,
+ unsigned int op_flags)
+{
+ bio_set_op_attrs(bio, op, op_flags);
+ submit_bio(bio);
+}
+
+struct page *__erofs_get_meta_page(struct super_block *sb, erofs_blk_t blkaddr,
+ bool prio, bool nofail);
+
+static inline struct page *erofs_get_meta_page(struct super_block *sb,
+ erofs_blk_t blkaddr, bool prio)
+{
+ return __erofs_get_meta_page(sb, blkaddr, prio, false);
+}
+
+int erofs_map_blocks(struct inode *, struct erofs_map_blocks *, int);
+
+static inline struct page *erofs_get_inline_page(struct inode *inode,
+ erofs_blk_t blkaddr)
+{
+ return erofs_get_meta_page(inode->i_sb, blkaddr,
+ S_ISDIR(inode->i_mode));
+}
+
+/* inode.c */
+static inline unsigned long erofs_inode_hash(erofs_nid_t nid)
+{
+#if BITS_PER_LONG == 32
+ return (nid >> 32) ^ (nid & 0xffffffff);
+#else
+ return nid;
+#endif
+}
+
+extern const struct inode_operations erofs_generic_iops;
+extern const struct inode_operations erofs_symlink_iops;
+extern const struct inode_operations erofs_fast_symlink_iops;
+
+static inline void set_inode_fast_symlink(struct inode *inode)
+{
+ inode->i_op = &erofs_fast_symlink_iops;
+}
+
+static inline bool is_inode_fast_symlink(struct inode *inode)
+{
+ return inode->i_op == &erofs_fast_symlink_iops;
+}
+
+struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid, bool dir);
+int erofs_getattr(const struct path *path, struct kstat *stat,
+ u32 request_mask, unsigned int query_flags);
+
+/* namei.c */
+extern const struct inode_operations erofs_dir_iops;
+
+int erofs_namei(struct inode *dir, struct qstr *name,
+ erofs_nid_t *nid, unsigned int *d_type);
+
+/* dir.c */
+extern const struct file_operations erofs_dir_fops;
+
+#endif /* __EROFS_INTERNAL_H */
+
--
2.17.1
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