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![Yangtao Li](/assets/img/avatar_default.png)
They are used during the erofs module init phase. Let's mark it as __init like any other function. Signed-off-by: Yangtao Li <frank.li@vivo.com> Reviewed-by: Yue Hu <huyue2@coolpad.com> Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com> Reviewed-by: Chao Yu <chao@kernel.org> Link: https://lore.kernel.org/r/20230303063731.66760-1-frank.li@vivo.com Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
595 lines
17 KiB
C
595 lines
17 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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* Copyright (C) 2021, Alibaba Cloud
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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/magic.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/iomap.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_device_info {
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char *path;
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struct erofs_fscache *fscache;
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struct block_device *bdev;
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struct dax_device *dax_dev;
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u64 dax_part_off;
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u32 blocks;
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u32 mapped_blkaddr;
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};
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enum {
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EROFS_SYNC_DECOMPRESS_AUTO,
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EROFS_SYNC_DECOMPRESS_FORCE_ON,
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EROFS_SYNC_DECOMPRESS_FORCE_OFF
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};
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struct erofs_mount_opts {
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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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/* strategy of sync decompression (0 - auto, 1 - force on, 2 - force off) */
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unsigned int sync_decompress;
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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_dev_context {
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struct idr tree;
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struct rw_semaphore rwsem;
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unsigned int extra_devices;
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};
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struct erofs_fs_context {
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struct erofs_mount_opts opt;
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struct erofs_dev_context *devs;
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char *fsid;
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char *domain_id;
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};
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/* all filesystem-wide lz4 configurations */
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struct erofs_sb_lz4_info {
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/* # of pages needed for EROFS lz4 rolling decompression */
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u16 max_distance_pages;
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/* maximum possible blocks for pclusters in the filesystem */
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u16 max_pclusterblks;
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};
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struct erofs_domain {
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refcount_t ref;
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struct list_head list;
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struct fscache_volume *volume;
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char *domain_id;
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};
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struct erofs_fscache {
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struct fscache_cookie *cookie;
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struct inode *inode; /* anonymous inode for the blob */
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/* used for share domain mode */
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struct erofs_domain *domain;
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struct list_head node;
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refcount_t ref;
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char *name;
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};
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struct erofs_sb_info {
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struct erofs_mount_opts opt; /* options */
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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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u16 available_compr_algs;
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/* pseudo inode to manage cached pages */
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struct inode *managed_cache;
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struct erofs_sb_lz4_info lz4;
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struct inode *packed_inode;
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#endif /* CONFIG_EROFS_FS_ZIP */
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struct erofs_dev_context *devs;
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struct dax_device *dax_dev;
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u64 dax_part_off;
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u64 total_blocks;
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u32 primarydevice_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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u16 device_id_mask; /* valid bits of device id to be used */
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/* inode slot unit size in bit shift */
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unsigned char islotbits;
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u32 sb_size; /* total superblock size */
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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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/* sysfs support */
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struct kobject s_kobj; /* /sys/fs/erofs/<devname> */
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struct completion s_kobj_unregister;
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/* fscache support */
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struct fscache_volume *volume;
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struct erofs_fscache *s_fscache;
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struct erofs_domain *domain;
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char *fsid;
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char *domain_id;
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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 EROFS_MOUNT_DAX_ALWAYS 0x00000040
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#define EROFS_MOUNT_DAX_NEVER 0x00000080
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#define clear_opt(opt, option) ((opt)->mount_opt &= ~EROFS_MOUNT_##option)
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#define set_opt(opt, option) ((opt)->mount_opt |= EROFS_MOUNT_##option)
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#define test_opt(opt, option) ((opt)->mount_opt & EROFS_MOUNT_##option)
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static inline bool erofs_is_fscache_mode(struct super_block *sb)
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{
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return IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND) && !sb->s_bdev;
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}
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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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#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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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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/* 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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enum erofs_kmap_type {
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EROFS_NO_KMAP, /* don't map the buffer */
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EROFS_KMAP, /* use kmap_local_page() to map the buffer */
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};
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struct erofs_buf {
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struct page *page;
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void *base;
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enum erofs_kmap_type kmap_type;
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};
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#define __EROFS_BUF_INITIALIZER ((struct erofs_buf){ .page = NULL })
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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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#define EROFS_FEATURE_FUNCS(name, compat, feature) \
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static inline bool erofs_sb_has_##name(struct erofs_sb_info *sbi) \
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{ \
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return sbi->feature_##compat & EROFS_FEATURE_##feature; \
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}
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EROFS_FEATURE_FUNCS(zero_padding, incompat, INCOMPAT_ZERO_PADDING)
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EROFS_FEATURE_FUNCS(compr_cfgs, incompat, INCOMPAT_COMPR_CFGS)
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EROFS_FEATURE_FUNCS(big_pcluster, incompat, INCOMPAT_BIG_PCLUSTER)
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EROFS_FEATURE_FUNCS(chunked_file, incompat, INCOMPAT_CHUNKED_FILE)
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EROFS_FEATURE_FUNCS(device_table, incompat, INCOMPAT_DEVICE_TABLE)
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EROFS_FEATURE_FUNCS(compr_head2, incompat, INCOMPAT_COMPR_HEAD2)
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EROFS_FEATURE_FUNCS(ztailpacking, incompat, INCOMPAT_ZTAILPACKING)
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EROFS_FEATURE_FUNCS(fragments, incompat, INCOMPAT_FRAGMENTS)
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EROFS_FEATURE_FUNCS(dedupe, incompat, INCOMPAT_DEDUPE)
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EROFS_FEATURE_FUNCS(sb_chksum, compat, COMPAT_SB_CHKSUM)
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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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struct {
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unsigned short chunkformat;
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unsigned char chunkbits;
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};
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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 long z_tailextent_headlcn;
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union {
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struct {
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erofs_off_t z_idataoff;
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unsigned short z_idata_size;
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};
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erofs_off_t z_fragmentoff;
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};
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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) container_of(ptr, struct erofs_inode, vfs_inode)
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static inline erofs_off_t erofs_iloc(struct inode *inode)
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{
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struct erofs_sb_info *sbi = EROFS_I_SB(inode);
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return blknr_to_addr(sbi->meta_blkaddr) +
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(EROFS_I(inode)->nid << sbi->islotbits);
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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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/*
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* Different from grab_cache_page_nowait(), reclaiming is never triggered
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* when allocating new pages.
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*/
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static inline
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struct page *erofs_grab_cache_page_nowait(struct address_space *mapping,
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pgoff_t index)
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{
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return pagecache_get_page(mapping, index,
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FGP_LOCK|FGP_CREAT|FGP_NOFS|FGP_NOWAIT,
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readahead_gfp_mask(mapping) & ~__GFP_RECLAIM);
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}
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/* Has a disk mapping */
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#define EROFS_MAP_MAPPED 0x0001
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/* Located in metadata (could be copied from bd_inode) */
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#define EROFS_MAP_META 0x0002
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/* The extent is encoded */
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#define EROFS_MAP_ENCODED 0x0004
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/* The length of extent is full */
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#define EROFS_MAP_FULL_MAPPED 0x0008
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/* Located in the special packed inode */
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#define EROFS_MAP_FRAGMENT 0x0010
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/* The extent refers to partial decompressed data */
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#define EROFS_MAP_PARTIAL_REF 0x0020
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struct erofs_map_blocks {
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struct erofs_buf buf;
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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 short m_deviceid;
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char m_algorithmformat;
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unsigned int m_flags;
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};
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/*
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* Used to get the exact decompressed length, e.g. fiemap (consider lookback
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* approach instead if possible since it's more metadata lightweight.)
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*/
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#define EROFS_GET_BLOCKS_FIEMAP 0x0001
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/* Used to map the whole extent if non-negligible data is requested for LZMA */
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#define EROFS_GET_BLOCKS_READMORE 0x0002
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/* Used to map tail extent for tailpacking inline or fragment pcluster */
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#define EROFS_GET_BLOCKS_FINDTAIL 0x0004
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enum {
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Z_EROFS_COMPRESSION_SHIFTED = Z_EROFS_COMPRESSION_MAX,
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Z_EROFS_COMPRESSION_INTERLACED,
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Z_EROFS_COMPRESSION_RUNTIME_MAX
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};
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struct erofs_map_dev {
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struct erofs_fscache *m_fscache;
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struct block_device *m_bdev;
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struct dax_device *m_daxdev;
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u64 m_dax_part_off;
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erofs_off_t m_pa;
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unsigned int m_deviceid;
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};
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extern struct file_system_type erofs_fs_type;
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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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extern const struct address_space_operations erofs_fscache_access_aops;
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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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extern const struct inode_operations erofs_dir_iops;
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extern const struct file_operations erofs_file_fops;
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extern const struct file_operations erofs_dir_fops;
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extern const struct iomap_ops z_erofs_iomap_report_ops;
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/* flags for erofs_fscache_register_cookie() */
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#define EROFS_REG_COOKIE_SHARE 0x0001
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#define EROFS_REG_COOKIE_NEED_NOEXIST 0x0002
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void erofs_unmap_metabuf(struct erofs_buf *buf);
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void erofs_put_metabuf(struct erofs_buf *buf);
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void *erofs_bread(struct erofs_buf *buf, struct inode *inode,
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erofs_blk_t blkaddr, enum erofs_kmap_type type);
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void *erofs_read_metabuf(struct erofs_buf *buf, struct super_block *sb,
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erofs_blk_t blkaddr, enum erofs_kmap_type type);
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int erofs_map_dev(struct super_block *sb, struct erofs_map_dev *dev);
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int erofs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
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u64 start, u64 len);
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int erofs_map_blocks(struct inode *inode, struct erofs_map_blocks *map);
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struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid);
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int erofs_getattr(struct mnt_idmap *idmap, const struct path *path,
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struct kstat *stat, u32 request_mask,
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unsigned int query_flags);
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int erofs_namei(struct inode *dir, const struct qstr *name,
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erofs_nid_t *nid, unsigned int *d_type);
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static inline void *erofs_vm_map_ram(struct page **pages, unsigned int count)
|
|
{
|
|
int retried = 0;
|
|
|
|
while (1) {
|
|
void *p = vm_map_ram(pages, count, -1);
|
|
|
|
/* retry two more times (totally 3 times) */
|
|
if (p || ++retried >= 3)
|
|
return p;
|
|
vm_unmap_aliases();
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
void *erofs_get_pcpubuf(unsigned int requiredpages);
|
|
void erofs_put_pcpubuf(void *ptr);
|
|
int erofs_pcpubuf_growsize(unsigned int nrpages);
|
|
void __init erofs_pcpubuf_init(void);
|
|
void erofs_pcpubuf_exit(void);
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|
|
|
int erofs_register_sysfs(struct super_block *sb);
|
|
void erofs_unregister_sysfs(struct super_block *sb);
|
|
int __init erofs_init_sysfs(void);
|
|
void erofs_exit_sysfs(void);
|
|
|
|
struct page *erofs_allocpage(struct page **pagepool, gfp_t gfp);
|
|
static inline void erofs_pagepool_add(struct page **pagepool, struct page *page)
|
|
{
|
|
set_page_private(page, (unsigned long)*pagepool);
|
|
*pagepool = page;
|
|
}
|
|
void erofs_release_pages(struct page **pagepool);
|
|
|
|
#ifdef CONFIG_EROFS_FS_ZIP
|
|
int erofs_workgroup_put(struct erofs_workgroup *grp);
|
|
struct erofs_workgroup *erofs_find_workgroup(struct super_block *sb,
|
|
pgoff_t index);
|
|
struct erofs_workgroup *erofs_insert_workgroup(struct super_block *sb,
|
|
struct erofs_workgroup *grp);
|
|
void erofs_workgroup_free_rcu(struct erofs_workgroup *grp);
|
|
void erofs_shrinker_register(struct super_block *sb);
|
|
void erofs_shrinker_unregister(struct super_block *sb);
|
|
int __init erofs_init_shrinker(void);
|
|
void erofs_exit_shrinker(void);
|
|
int __init z_erofs_init_zip_subsystem(void);
|
|
void z_erofs_exit_zip_subsystem(void);
|
|
int erofs_try_to_free_all_cached_pages(struct erofs_sb_info *sbi,
|
|
struct erofs_workgroup *egrp);
|
|
int erofs_try_to_free_cached_page(struct page *page);
|
|
int z_erofs_load_lz4_config(struct super_block *sb,
|
|
struct erofs_super_block *dsb,
|
|
struct z_erofs_lz4_cfgs *lz4, int len);
|
|
int z_erofs_fill_inode(struct inode *inode);
|
|
int z_erofs_map_blocks_iter(struct inode *inode, struct erofs_map_blocks *map,
|
|
int flags);
|
|
#else
|
|
static inline void erofs_shrinker_register(struct super_block *sb) {}
|
|
static inline void erofs_shrinker_unregister(struct super_block *sb) {}
|
|
static inline int erofs_init_shrinker(void) { return 0; }
|
|
static inline void erofs_exit_shrinker(void) {}
|
|
static inline int z_erofs_init_zip_subsystem(void) { return 0; }
|
|
static inline void z_erofs_exit_zip_subsystem(void) {}
|
|
static inline int z_erofs_load_lz4_config(struct super_block *sb,
|
|
struct erofs_super_block *dsb,
|
|
struct z_erofs_lz4_cfgs *lz4, int len)
|
|
{
|
|
if (lz4 || dsb->u1.lz4_max_distance) {
|
|
erofs_err(sb, "lz4 algorithm isn't enabled");
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
static inline int z_erofs_fill_inode(struct inode *inode) { return -EOPNOTSUPP; }
|
|
#endif /* !CONFIG_EROFS_FS_ZIP */
|
|
|
|
#ifdef CONFIG_EROFS_FS_ZIP_LZMA
|
|
int __init z_erofs_lzma_init(void);
|
|
void z_erofs_lzma_exit(void);
|
|
int z_erofs_load_lzma_config(struct super_block *sb,
|
|
struct erofs_super_block *dsb,
|
|
struct z_erofs_lzma_cfgs *lzma, int size);
|
|
#else
|
|
static inline int z_erofs_lzma_init(void) { return 0; }
|
|
static inline int z_erofs_lzma_exit(void) { return 0; }
|
|
static inline int z_erofs_load_lzma_config(struct super_block *sb,
|
|
struct erofs_super_block *dsb,
|
|
struct z_erofs_lzma_cfgs *lzma, int size) {
|
|
if (lzma) {
|
|
erofs_err(sb, "lzma algorithm isn't enabled");
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
#endif /* !CONFIG_EROFS_FS_ZIP_LZMA */
|
|
|
|
#ifdef CONFIG_EROFS_FS_ONDEMAND
|
|
int erofs_fscache_register_fs(struct super_block *sb);
|
|
void erofs_fscache_unregister_fs(struct super_block *sb);
|
|
|
|
struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb,
|
|
char *name, unsigned int flags);
|
|
void erofs_fscache_unregister_cookie(struct erofs_fscache *fscache);
|
|
#else
|
|
static inline int erofs_fscache_register_fs(struct super_block *sb)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
static inline void erofs_fscache_unregister_fs(struct super_block *sb) {}
|
|
|
|
static inline
|
|
struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb,
|
|
char *name, unsigned int flags)
|
|
{
|
|
return ERR_PTR(-EOPNOTSUPP);
|
|
}
|
|
|
|
static inline void erofs_fscache_unregister_cookie(struct erofs_fscache *fscache)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
|
|
|
|
#endif /* __EROFS_INTERNAL_H */
|