436 lines
12 KiB
C
436 lines
12 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2017-2018 HUAWEI, Inc.
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* https://www.huawei.com/
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* Created by Gao Xiang <gaoxiang25@huawei.com>
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*/
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#ifndef __EROFS_INTERNAL_H
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#define __EROFS_INTERNAL_H
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#include <linux/fs.h>
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#include <linux/dcache.h>
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#include <linux/mm.h>
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#include <linux/pagemap.h>
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#include <linux/bio.h>
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#include <linux/buffer_head.h>
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#include <linux/magic.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include "erofs_fs.h"
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/* redefine pr_fmt "erofs: " */
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#undef pr_fmt
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#define pr_fmt(fmt) "erofs: " fmt
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__printf(3, 4) void _erofs_err(struct super_block *sb,
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const char *function, const char *fmt, ...);
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#define erofs_err(sb, fmt, ...) \
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_erofs_err(sb, __func__, fmt "\n", ##__VA_ARGS__)
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__printf(3, 4) void _erofs_info(struct super_block *sb,
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const char *function, const char *fmt, ...);
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#define erofs_info(sb, fmt, ...) \
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_erofs_info(sb, __func__, fmt "\n", ##__VA_ARGS__)
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#ifdef CONFIG_EROFS_FS_DEBUG
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#define erofs_dbg(x, ...) pr_debug(x "\n", ##__VA_ARGS__)
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#define DBG_BUGON BUG_ON
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#else
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#define erofs_dbg(x, ...) ((void)0)
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#define DBG_BUGON(x) ((void)(x))
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#endif /* !CONFIG_EROFS_FS_DEBUG */
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/* EROFS_SUPER_MAGIC_V1 to represent the whole file system */
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#define EROFS_SUPER_MAGIC EROFS_SUPER_MAGIC_V1
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typedef u64 erofs_nid_t;
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typedef u64 erofs_off_t;
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/* data type for filesystem-wide blocks number */
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typedef u32 erofs_blk_t;
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struct erofs_fs_context {
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#ifdef CONFIG_EROFS_FS_ZIP
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/* current strategy of how to use managed cache */
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unsigned char cache_strategy;
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/* threshold for decompression synchronously */
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unsigned int max_sync_decompress_pages;
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#endif
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unsigned int mount_opt;
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};
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struct erofs_sb_info {
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#ifdef CONFIG_EROFS_FS_ZIP
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/* list for all registered superblocks, mainly for shrinker */
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struct list_head list;
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struct mutex umount_mutex;
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/* managed XArray arranged in physical block number */
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struct xarray managed_pslots;
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unsigned int shrinker_run_no;
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/* pseudo inode to manage cached pages */
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struct inode *managed_cache;
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#endif /* CONFIG_EROFS_FS_ZIP */
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u32 blocks;
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u32 meta_blkaddr;
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#ifdef CONFIG_EROFS_FS_XATTR
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u32 xattr_blkaddr;
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#endif
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/* inode slot unit size in bit shift */
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unsigned char islotbits;
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u32 build_time_nsec;
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u64 build_time;
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/* what we really care is nid, rather than ino.. */
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erofs_nid_t root_nid;
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/* used for statfs, f_files - f_favail */
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u64 inos;
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u8 uuid[16]; /* 128-bit uuid for volume */
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u8 volume_name[16]; /* volume name */
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u32 feature_compat;
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u32 feature_incompat;
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struct erofs_fs_context ctx; /* options */
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};
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#define EROFS_SB(sb) ((struct erofs_sb_info *)(sb)->s_fs_info)
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#define EROFS_I_SB(inode) ((struct erofs_sb_info *)(inode)->i_sb->s_fs_info)
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/* Mount flags set via mount options or defaults */
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#define EROFS_MOUNT_XATTR_USER 0x00000010
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#define EROFS_MOUNT_POSIX_ACL 0x00000020
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#define clear_opt(ctx, option) ((ctx)->mount_opt &= ~EROFS_MOUNT_##option)
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#define set_opt(ctx, option) ((ctx)->mount_opt |= EROFS_MOUNT_##option)
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#define test_opt(ctx, option) ((ctx)->mount_opt & EROFS_MOUNT_##option)
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enum {
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EROFS_ZIP_CACHE_DISABLED,
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EROFS_ZIP_CACHE_READAHEAD,
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EROFS_ZIP_CACHE_READAROUND
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};
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#ifdef CONFIG_EROFS_FS_ZIP
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#define EROFS_LOCKED_MAGIC (INT_MIN | 0xE0F510CCL)
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/* basic unit of the workstation of a super_block */
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struct erofs_workgroup {
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/* the workgroup index in the workstation */
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pgoff_t index;
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/* overall workgroup reference count */
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atomic_t refcount;
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};
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#if defined(CONFIG_SMP)
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static inline bool erofs_workgroup_try_to_freeze(struct erofs_workgroup *grp,
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int val)
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{
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preempt_disable();
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if (val != atomic_cmpxchg(&grp->refcount, val, EROFS_LOCKED_MAGIC)) {
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preempt_enable();
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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 erofs_workgroup_unfreeze(struct erofs_workgroup *grp,
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int orig_val)
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{
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/*
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* other observers should notice all modifications
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* in the freezing period.
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*/
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smp_mb();
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atomic_set(&grp->refcount, orig_val);
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preempt_enable();
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}
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static inline int erofs_wait_on_workgroup_freezed(struct erofs_workgroup *grp)
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{
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return atomic_cond_read_relaxed(&grp->refcount,
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VAL != EROFS_LOCKED_MAGIC);
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}
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#else
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static inline bool erofs_workgroup_try_to_freeze(struct erofs_workgroup *grp,
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int val)
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{
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preempt_disable();
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/* no need to spin on UP platforms, let's just disable preemption. */
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if (val != atomic_read(&grp->refcount)) {
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preempt_enable();
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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 erofs_workgroup_unfreeze(struct erofs_workgroup *grp,
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int orig_val)
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{
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preempt_enable();
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}
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static inline int erofs_wait_on_workgroup_freezed(struct erofs_workgroup *grp)
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{
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int v = atomic_read(&grp->refcount);
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/* workgroup is never freezed on uniprocessor systems */
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DBG_BUGON(v == EROFS_LOCKED_MAGIC);
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return v;
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}
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#endif /* !CONFIG_SMP */
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/* hard limit of pages per compressed cluster */
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#define Z_EROFS_CLUSTER_MAX_PAGES (CONFIG_EROFS_FS_CLUSTER_PAGE_LIMIT)
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#define EROFS_PCPUBUF_NR_PAGES Z_EROFS_CLUSTER_MAX_PAGES
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#else
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#define EROFS_PCPUBUF_NR_PAGES 0
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#endif /* !CONFIG_EROFS_FS_ZIP */
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/* we strictly follow PAGE_SIZE and no buffer head yet */
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#define LOG_BLOCK_SIZE PAGE_SHIFT
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#undef LOG_SECTORS_PER_BLOCK
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#define LOG_SECTORS_PER_BLOCK (PAGE_SHIFT - 9)
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#undef SECTORS_PER_BLOCK
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#define SECTORS_PER_BLOCK (1 << SECTORS_PER_BLOCK)
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#define EROFS_BLKSIZ (1 << LOG_BLOCK_SIZE)
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#if (EROFS_BLKSIZ % 4096 || !EROFS_BLKSIZ)
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#error erofs cannot be used in this platform
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#endif
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#define ROOT_NID(sb) ((sb)->root_nid)
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#define erofs_blknr(addr) ((addr) / EROFS_BLKSIZ)
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#define erofs_blkoff(addr) ((addr) % EROFS_BLKSIZ)
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#define blknr_to_addr(nr) ((erofs_off_t)(nr) * EROFS_BLKSIZ)
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static inline erofs_off_t iloc(struct erofs_sb_info *sbi, erofs_nid_t nid)
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{
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return blknr_to_addr(sbi->meta_blkaddr) + (nid << sbi->islotbits);
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}
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/* atomic flag definitions */
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#define EROFS_I_EA_INITED_BIT 0
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#define EROFS_I_Z_INITED_BIT 1
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/* bitlock definitions (arranged in reverse order) */
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#define EROFS_I_BL_XATTR_BIT (BITS_PER_LONG - 1)
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#define EROFS_I_BL_Z_BIT (BITS_PER_LONG - 2)
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struct erofs_inode {
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erofs_nid_t nid;
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/* atomic flags (including bitlocks) */
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unsigned long flags;
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unsigned char datalayout;
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unsigned char inode_isize;
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unsigned short xattr_isize;
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unsigned int xattr_shared_count;
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unsigned int *xattr_shared_xattrs;
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union {
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erofs_blk_t raw_blkaddr;
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#ifdef CONFIG_EROFS_FS_ZIP
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struct {
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unsigned short z_advise;
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unsigned char z_algorithmtype[2];
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unsigned char z_logical_clusterbits;
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unsigned char z_physical_clusterbits[2];
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};
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#endif /* CONFIG_EROFS_FS_ZIP */
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};
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/* the corresponding vfs inode */
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struct inode vfs_inode;
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};
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#define EROFS_I(ptr) \
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container_of(ptr, struct erofs_inode, vfs_inode)
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static inline unsigned long erofs_inode_datablocks(struct inode *inode)
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{
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/* since i_size cannot be changed */
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return DIV_ROUND_UP(inode->i_size, EROFS_BLKSIZ);
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}
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static inline unsigned int erofs_bitrange(unsigned int value, unsigned int bit,
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unsigned int bits)
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{
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return (value >> bit) & ((1 << bits) - 1);
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}
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static inline unsigned int erofs_inode_version(unsigned int value)
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{
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return erofs_bitrange(value, EROFS_I_VERSION_BIT,
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EROFS_I_VERSION_BITS);
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}
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static inline unsigned int erofs_inode_datalayout(unsigned int value)
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{
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return erofs_bitrange(value, EROFS_I_DATALAYOUT_BIT,
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EROFS_I_DATALAYOUT_BITS);
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}
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extern const struct super_operations erofs_sops;
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extern const struct address_space_operations erofs_raw_access_aops;
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extern const struct address_space_operations z_erofs_aops;
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/*
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* Logical to physical block mapping, used by erofs_map_blocks()
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*
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* Different with other file systems, it is used for 2 access modes:
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*
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* 1) RAW access mode:
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*
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* Users pass a valid (m_lblk, m_lofs -- usually 0) pair,
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* and get the valid m_pblk, m_pofs and the longest m_len(in bytes).
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*
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* Note that m_lblk in the RAW access mode refers to the number of
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* the compressed ondisk block rather than the uncompressed
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* in-memory block for the compressed file.
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*
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* m_pofs equals to m_lofs except for the inline data page.
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*
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* 2) Normal access mode:
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*
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* If the inode is not compressed, it has no difference with
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* the RAW access mode. However, if the inode is compressed,
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* users should pass a valid (m_lblk, m_lofs) pair, and get
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* the needed m_pblk, m_pofs, m_len to get the compressed data
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* and the updated m_lblk, m_lofs which indicates the start
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* of the corresponding uncompressed data in the file.
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*/
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enum {
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BH_Zipped = BH_PrivateStart,
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BH_FullMapped,
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};
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/* Has a disk mapping */
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#define EROFS_MAP_MAPPED (1 << BH_Mapped)
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/* Located in metadata (could be copied from bd_inode) */
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#define EROFS_MAP_META (1 << BH_Meta)
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/* The extent has been compressed */
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#define EROFS_MAP_ZIPPED (1 << BH_Zipped)
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/* The length of extent is full */
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#define EROFS_MAP_FULL_MAPPED (1 << BH_FullMapped)
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struct erofs_map_blocks {
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erofs_off_t m_pa, m_la;
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u64 m_plen, m_llen;
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unsigned int m_flags;
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struct page *mpage;
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};
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/* Flags used by erofs_map_blocks() */
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#define EROFS_GET_BLOCKS_RAW 0x0001
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/* zmap.c */
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#ifdef CONFIG_EROFS_FS_ZIP
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int z_erofs_fill_inode(struct inode *inode);
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int z_erofs_map_blocks_iter(struct inode *inode,
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struct erofs_map_blocks *map,
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int flags);
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#else
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static inline int z_erofs_fill_inode(struct inode *inode) { return -EOPNOTSUPP; }
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static inline int z_erofs_map_blocks_iter(struct inode *inode,
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struct erofs_map_blocks *map,
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int flags)
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{
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return -EOPNOTSUPP;
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}
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#endif /* !CONFIG_EROFS_FS_ZIP */
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/* data.c */
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struct page *erofs_get_meta_page(struct super_block *sb, erofs_blk_t blkaddr);
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int erofs_map_blocks(struct inode *, struct erofs_map_blocks *, int);
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/* inode.c */
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static inline unsigned long erofs_inode_hash(erofs_nid_t nid)
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{
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#if BITS_PER_LONG == 32
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return (nid >> 32) ^ (nid & 0xffffffff);
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#else
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return nid;
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#endif
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}
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extern const struct inode_operations erofs_generic_iops;
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extern const struct inode_operations erofs_symlink_iops;
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extern const struct inode_operations erofs_fast_symlink_iops;
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struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid, bool dir);
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int erofs_getattr(const struct path *path, struct kstat *stat,
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u32 request_mask, unsigned int query_flags);
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/* namei.c */
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extern const struct inode_operations erofs_dir_iops;
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int erofs_namei(struct inode *dir, struct qstr *name,
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erofs_nid_t *nid, unsigned int *d_type);
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/* dir.c */
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extern const struct file_operations erofs_dir_fops;
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/* utils.c / zdata.c */
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struct page *erofs_allocpage(struct list_head *pool, gfp_t gfp);
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#if (EROFS_PCPUBUF_NR_PAGES > 0)
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void *erofs_get_pcpubuf(unsigned int pagenr);
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#define erofs_put_pcpubuf(buf) do { \
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(void)&(buf); \
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preempt_enable(); \
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} while (0)
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#else
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static inline void *erofs_get_pcpubuf(unsigned int pagenr)
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{
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return ERR_PTR(-EOPNOTSUPP);
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}
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#define erofs_put_pcpubuf(buf) do {} while (0)
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#endif
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#ifdef CONFIG_EROFS_FS_ZIP
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int erofs_workgroup_put(struct erofs_workgroup *grp);
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struct erofs_workgroup *erofs_find_workgroup(struct super_block *sb,
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pgoff_t index);
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struct erofs_workgroup *erofs_insert_workgroup(struct super_block *sb,
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struct erofs_workgroup *grp);
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void erofs_workgroup_free_rcu(struct erofs_workgroup *grp);
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void erofs_shrinker_register(struct super_block *sb);
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void erofs_shrinker_unregister(struct super_block *sb);
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int __init erofs_init_shrinker(void);
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void erofs_exit_shrinker(void);
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int __init z_erofs_init_zip_subsystem(void);
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void z_erofs_exit_zip_subsystem(void);
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int erofs_try_to_free_all_cached_pages(struct erofs_sb_info *sbi,
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struct erofs_workgroup *egrp);
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int erofs_try_to_free_cached_page(struct address_space *mapping,
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struct page *page);
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#else
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static inline void erofs_shrinker_register(struct super_block *sb) {}
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static inline void erofs_shrinker_unregister(struct super_block *sb) {}
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static inline int erofs_init_shrinker(void) { return 0; }
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static inline void erofs_exit_shrinker(void) {}
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static inline int z_erofs_init_zip_subsystem(void) { return 0; }
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static inline void z_erofs_exit_zip_subsystem(void) {}
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#endif /* !CONFIG_EROFS_FS_ZIP */
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#define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
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#endif /* __EROFS_INTERNAL_H */
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