selftests/bpf: Reject graph kptr use after RCU unlockgrafted

Add a sleepable verifier test that loads a graph-node local kptr in an
explicit RCU read-side critical section, then passes its node to
bpf_rbtree_remove() after the section ends.

Before the verifier fix, the stale NON_OWN_REF flag makes the node look like
a live borrowed reference and the program is accepted. After the fix, the
pointer is demoted without NON_OWN_REF and the graph kfunc argument is
rejected.

Also exercise a graph kptr loaded while a spin lock provides implicit RCU
protection. The pointer must be invalidated when the lock is released, which
guards the required ordering between non-owning-reference invalidation and
RCU demotion.

Update the existing fault-protected load test state description. The
post-unlock pointer no longer carries NON_OWN_REF, but remains readable
because the load is rewritten to use BPF_PROBE_MEM.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20260904084325.52250-7-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

1 files changed, 535 insertions, 0 deletions

diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
new file mode 100644
index 000000000..57bd21859
--- /dev/null
+++ b/fs/erofs/internal.h
@@ -0,0 +1,535 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2017-2018 HUAWEI, Inc.
+ *             https://www.huawei.com/
+ * Copyright (C) 2021, Alibaba Cloud
+ */
+#ifndef __EROFS_INTERNAL_H
+#define __EROFS_INTERNAL_H
+
+#include <linux/fs.h>
+#include <linux/dax.h>
+#include <linux/dcache.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/pagemap.h>
+#include <linux/bio.h>
+#include <linux/magic.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/iomap.h>
+#include "erofs_fs.h"
+
+__printf(2, 3) void _erofs_printk(struct super_block *sb, const char *fmt, ...);
+#define erofs_err(sb, fmt, ...)	\
+	_erofs_printk(sb, KERN_ERR fmt "\n", ##__VA_ARGS__)
+#define erofs_warn(sb, fmt, ...) \
+	_erofs_printk(sb, KERN_WARNING fmt "\n", ##__VA_ARGS__)
+#define erofs_info(sb, fmt, ...) \
+	_erofs_printk(sb, KERN_INFO fmt "\n", ##__VA_ARGS__)
+
+#ifdef CONFIG_EROFS_FS_DEBUG
+#define DBG_BUGON               BUG_ON
+#else
+#define DBG_BUGON(x)            ((void)(x))
+#endif	/* !CONFIG_EROFS_FS_DEBUG */
+
+/* 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;
+typedef u64 erofs_blk_t;
+
+struct erofs_device_info {
+	char *path;
+	struct file *file;
+	struct dax_device *dax_dev;
+	u64 fsoff, dax_part_off;
+
+	erofs_blk_t blocks;
+	erofs_blk_t uniaddr;
+};
+
+enum {
+	EROFS_SYNC_DECOMPRESS_AUTO,
+	EROFS_SYNC_DECOMPRESS_FORCE_ON,
+	EROFS_SYNC_DECOMPRESS_FORCE_OFF
+};
+
+struct erofs_mount_opts {
+	/* current strategy of how to use managed cache */
+	unsigned char cache_strategy;
+	unsigned int mount_opt;
+};
+
+struct erofs_dev_context {
+	struct idr tree;
+	struct rw_semaphore rwsem;
+
+	unsigned int extra_devices;
+	bool flatdev;
+};
+
+/* all filesystem-wide lz4 configurations */
+struct erofs_sb_lz4_info {
+	/* # of pages needed for EROFS lz4 rolling decompression */
+	u16 max_distance_pages;
+	/* maximum possible blocks for pclusters in the filesystem */
+	u16 max_pclusterblks;
+};
+
+struct erofs_xattr_prefix_item {
+	struct erofs_xattr_long_prefix *prefix;
+	u8 infix_len;
+};
+
+struct erofs_sb_info {
+	struct erofs_device_info dif0;
+	struct erofs_mount_opts opt;	/* options */
+#ifdef CONFIG_EROFS_FS_ZIP
+	/* list for all registered superblocks, mainly for shrinker */
+	struct list_head list;
+	struct mutex umount_mutex;
+
+	/* managed XArray arranged in physical block number */
+	struct xarray managed_pslots;
+
+	unsigned int sync_decompress;	/* strategy for sync decompression */
+	unsigned int shrinker_run_no;
+
+	/* pseudo inode to manage cached pages */
+	struct inode *managed_cache;
+
+	struct erofs_sb_lz4_info lz4;
+#endif	/* CONFIG_EROFS_FS_ZIP */
+	struct inode *packed_inode;
+	struct inode *metabox_inode;
+	struct erofs_dev_context *devs;
+	u64 total_blocks;
+
+	u32 meta_blkaddr;
+#ifdef CONFIG_EROFS_FS_XATTR
+	u32 xattr_blkaddr;
+	u32 xattr_prefix_start;
+	u8 xattr_prefix_count;
+	u8 ishare_xattr_prefix_id;
+	struct erofs_xattr_prefix_item *xattr_prefixes;
+	unsigned int xattr_filter_reserved;
+#endif
+	u16 device_id_mask;	/* valid bits of device id to be used */
+
+	unsigned char islotbits;	/* inode slot unit size in bit shift */
+	unsigned char blkszbits;	/* filesystem block size in bit shift */
+
+	u32 sb_size;			/* total superblock size */
+	u32 fixed_nsec;
+	s64 epoch;
+
+	/* what we really care is nid, rather than ino.. */
+	erofs_nid_t root_nid;
+	erofs_nid_t packed_nid;
+	erofs_nid_t metabox_nid;
+	/* used for statfs, f_files - f_favail */
+	u64 inos;
+
+	char *volume_name;
+	u32 feature_compat;
+	u32 feature_incompat;
+	u16 available_compr_algs;
+
+	/* sysfs support */
+	struct kobject s_kobj;		/* /sys/fs/erofs/<devname> */
+	struct completion s_kobj_unregister;
+	erofs_off_t dir_ra_bytes;
+
+	char *domain_id;
+};
+
+#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_XATTR_USER		0x00000010
+#define EROFS_MOUNT_POSIX_ACL		0x00000020
+#define EROFS_MOUNT_DAX_ALWAYS		0x00000040
+#define EROFS_MOUNT_DAX_NEVER		0x00000080
+#define EROFS_MOUNT_DIRECT_IO		0x00000100
+#define EROFS_MOUNT_INODE_SHARE		0x00000200
+
+#define clear_opt(opt, option)	((opt)->mount_opt &= ~EROFS_MOUNT_##option)
+#define set_opt(opt, option)	((opt)->mount_opt |= EROFS_MOUNT_##option)
+#define test_opt(opt, option)	((opt)->mount_opt & EROFS_MOUNT_##option)
+
+static inline bool erofs_is_fileio_mode(struct erofs_sb_info *sbi)
+{
+	return IS_ENABLED(CONFIG_EROFS_FS_BACKED_BY_FILE) && sbi->dif0.file;
+}
+
+extern struct file_system_type erofs_anon_fs_type;
+
+enum {
+	EROFS_ZIP_CACHE_DISABLED,
+	EROFS_ZIP_CACHE_READAHEAD,
+	EROFS_ZIP_CACHE_READAROUND
+};
+
+struct erofs_buf {
+	struct address_space *mapping;
+	struct file *file;
+	u64 off;
+	struct page *page;
+	void *base;
+};
+#define __EROFS_BUF_INITIALIZER	((struct erofs_buf){ .page = NULL })
+
+#define erofs_blknr(sb, pos)	((erofs_blk_t)((pos) >> (sb)->s_blocksize_bits))
+#define erofs_blkoff(sb, pos)	((pos) & ((sb)->s_blocksize - 1))
+#define erofs_pos(sb, blk)	((erofs_off_t)(blk) << (sb)->s_blocksize_bits)
+#define erofs_iblks(i)	(round_up((i)->i_size, i_blocksize(i)) >> (i)->i_blkbits)
+
+#define EROFS_FEATURE_FUNCS(name, compat, feature) \
+static inline bool erofs_sb_has_##name(struct erofs_sb_info *sbi) \
+{ \
+	return sbi->feature_##compat & EROFS_FEATURE_##feature; \
+}
+
+EROFS_FEATURE_FUNCS(lz4_0padding, incompat, INCOMPAT_LZ4_0PADDING)
+EROFS_FEATURE_FUNCS(compr_cfgs, incompat, INCOMPAT_COMPR_CFGS)
+EROFS_FEATURE_FUNCS(big_pcluster, incompat, INCOMPAT_BIG_PCLUSTER)
+EROFS_FEATURE_FUNCS(chunked_file, incompat, INCOMPAT_CHUNKED_FILE)
+EROFS_FEATURE_FUNCS(device_table, incompat, INCOMPAT_DEVICE_TABLE)
+EROFS_FEATURE_FUNCS(compr_head2, incompat, INCOMPAT_COMPR_HEAD2)
+EROFS_FEATURE_FUNCS(ztailpacking, incompat, INCOMPAT_ZTAILPACKING)
+EROFS_FEATURE_FUNCS(fragments, incompat, INCOMPAT_FRAGMENTS)
+EROFS_FEATURE_FUNCS(dedupe, incompat, INCOMPAT_DEDUPE)
+EROFS_FEATURE_FUNCS(xattr_prefixes, incompat, INCOMPAT_XATTR_PREFIXES)
+EROFS_FEATURE_FUNCS(48bit, incompat, INCOMPAT_48BIT)
+EROFS_FEATURE_FUNCS(metabox, incompat, INCOMPAT_METABOX)
+EROFS_FEATURE_FUNCS(sb_chksum, compat, COMPAT_SB_CHKSUM)
+EROFS_FEATURE_FUNCS(xattr_filter, compat, COMPAT_XATTR_FILTER)
+EROFS_FEATURE_FUNCS(shared_ea_in_metabox, compat, COMPAT_SHARED_EA_IN_METABOX)
+EROFS_FEATURE_FUNCS(plain_xattr_pfx, compat, COMPAT_PLAIN_XATTR_PFX)
+EROFS_FEATURE_FUNCS(ishare_xattrs, compat, COMPAT_ISHARE_XATTRS)
+
+static inline u64 erofs_nid_to_ino64(struct erofs_sb_info *sbi, erofs_nid_t nid)
+{
+	if (!erofs_sb_has_metabox(sbi))
+		return nid;
+
+	/*
+	 * When metadata compression is enabled, avoid generating excessively
+	 * large inode numbers for metadata-compressed inodes.  Shift NIDs in
+	 * the 31-62 bit range left by one and move the metabox flag to bit 31.
+	 *
+	 * Note: on-disk NIDs remain unchanged as they are primarily used for
+	 * compatibility with non-LFS 32-bit applications.
+	 */
+	return ((nid << 1) & GENMASK_ULL(63, 32)) | (nid & GENMASK(30, 0)) |
+		((nid >> EROFS_DIRENT_NID_METABOX_BIT) << 31);
+}
+
+/* atomic flag definitions */
+#define EROFS_I_EA_INITED_BIT	0
+#define EROFS_I_Z_INITED_BIT	1
+
+/* bitlock definitions (arranged in reverse order) */
+#define EROFS_I_BL_XATTR_BIT	(BITS_PER_LONG - 1)
+#define EROFS_I_BL_Z_BIT	(BITS_PER_LONG - 2)
+
+/* default readahead size of directories */
+#define EROFS_DIR_RA_BYTES	16384
+
+struct erofs_inode_fingerprint {
+	u8 *opaque;
+	int size;
+};
+
+struct erofs_inode {
+	erofs_nid_t nid;
+
+	/* atomic flags (including bitlocks) */
+	unsigned long flags;
+
+	unsigned char datalayout;
+	unsigned char inode_isize;
+	bool dot_omitted;
+	unsigned int xattr_isize;
+
+	unsigned int xattr_name_filter;
+	unsigned int xattr_shared_count;
+	unsigned int *xattr_shared_xattrs;
+
+	union {
+		erofs_blk_t startblk;
+		struct {
+			unsigned short	chunkformat;
+			unsigned char	chunkbits;
+		};
+#ifdef CONFIG_EROFS_FS_ZIP
+		struct {
+			unsigned short z_advise;
+			unsigned char  z_algorithmtype[2];
+			unsigned char  z_lclusterbits;
+			union {
+				u64    z_tailextent_headlcn;
+				u64    z_extents;
+			};
+			erofs_off_t    z_fragmentoff;
+			unsigned short z_idata_size;
+		};
+#endif	/* CONFIG_EROFS_FS_ZIP */
+	};
+#ifdef CONFIG_EROFS_FS_PAGE_CACHE_SHARE
+	struct list_head ishare_list;
+	union {
+		/* for each anon shared inode */
+		struct {
+			struct erofs_inode_fingerprint fingerprint;
+			spinlock_t ishare_lock;
+		};
+		/* for each real filesystem inode */
+		struct dentry *sharedentry;
+	};
+#endif
+	/* the corresponding vfs inode */
+	struct inode vfs_inode;
+};
+
+#define EROFS_I(ptr)	container_of(ptr, struct erofs_inode, vfs_inode)
+
+static inline bool erofs_inode_in_metabox(struct inode *inode)
+{
+	return EROFS_I(inode)->nid & BIT_ULL(EROFS_DIRENT_NID_METABOX_BIT);
+}
+
+static inline erofs_off_t erofs_iloc(struct inode *inode)
+{
+	struct erofs_sb_info *sbi = EROFS_I_SB(inode);
+	erofs_nid_t nid_lo = EROFS_I(inode)->nid & EROFS_DIRENT_NID_MASK;
+
+	if (erofs_inode_in_metabox(inode))
+		return nid_lo << sbi->islotbits;
+	return erofs_pos(inode->i_sb, sbi->meta_blkaddr) +
+		(nid_lo << sbi->islotbits);
+}
+
+static inline unsigned int erofs_inode_version(unsigned int ifmt)
+{
+	return (ifmt >> EROFS_I_VERSION_BIT) & EROFS_I_VERSION_MASK;
+}
+
+static inline unsigned int erofs_inode_datalayout(unsigned int ifmt)
+{
+	return (ifmt >> EROFS_I_DATALAYOUT_BIT) & EROFS_I_DATALAYOUT_MASK;
+}
+
+/* reclaiming is never triggered when allocating new folios. */
+static inline struct folio *erofs_grab_folio_nowait(struct address_space *as,
+						    pgoff_t index)
+{
+	return __filemap_get_folio(as, index,
+			FGP_LOCK|FGP_CREAT|FGP_NOFS|FGP_NOWAIT,
+			readahead_gfp_mask(as) & ~__GFP_RECLAIM);
+}
+
+/* Allocated on disk at @m_pa (e.g. NOT a fragment extent) */
+#define EROFS_MAP_MAPPED		0x0001
+/* Located in metadata (could be copied from bd_inode) */
+#define EROFS_MAP_META			0x0002
+/* @m_llen may be truncated by the runtime compared to the on-disk record */
+#define EROFS_MAP_PARTIAL_MAPPED	0x0004
+/* The on-disk @m_llen may cover only part of the encoded data */
+#define EROFS_MAP_PARTIAL_REF		0x0008
+/* Located in the special packed inode */
+#define EROFS_MAP_FRAGMENT		0x0010
+/* The encoded on-disk data will be fully handled (decompressed) */
+#define EROFS_MAP_FULL(f)	(!((f) & (EROFS_MAP_PARTIAL_MAPPED | \
+					  EROFS_MAP_PARTIAL_REF)))
+
+struct erofs_map_blocks {
+	struct erofs_buf buf;
+
+	erofs_off_t m_pa, m_la;
+	u64 m_plen, m_llen;
+
+	unsigned short m_deviceid;
+	char m_algorithmformat;
+	unsigned int m_flags;
+};
+
+/*
+ * Used to get the exact decompressed length, e.g. fiemap (consider lookback
+ * approach instead if possible since it's more metadata lightweight.)
+ */
+#define EROFS_GET_BLOCKS_FIEMAP		0x0001
+/* Used to map the whole extent if non-negligible data is requested for LZMA */
+#define EROFS_GET_BLOCKS_READMORE	0x0002
+/* Used to map tail extent for tailpacking inline or fragment pcluster */
+#define EROFS_GET_BLOCKS_FINDTAIL	0x0004
+
+enum {
+	Z_EROFS_COMPRESSION_SHIFTED = Z_EROFS_COMPRESSION_MAX,
+	Z_EROFS_COMPRESSION_INTERLACED,
+	Z_EROFS_COMPRESSION_RUNTIME_MAX
+};
+
+struct erofs_map_dev {
+	struct super_block *m_sb;
+	struct erofs_device_info *m_dif;
+	struct block_device *m_bdev;
+
+	erofs_off_t m_pa;
+	unsigned int m_deviceid;
+};
+
+extern const struct super_operations erofs_sops;
+extern const struct address_space_operations erofs_aops;
+extern const struct address_space_operations erofs_fileio_aops;
+extern const struct address_space_operations z_erofs_aops;
+
+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;
+extern const struct inode_operations erofs_dir_iops;
+
+extern const struct file_operations erofs_file_fops;
+extern const struct file_operations erofs_dir_fops;
+extern const struct file_operations erofs_ishare_fops;
+
+extern const struct iomap_ops z_erofs_iomap_report_ops;
+
+void *erofs_read_metadata(struct super_block *sb, struct erofs_buf *buf,
+			  erofs_off_t *offset, int *lengthp);
+void erofs_unmap_metabuf(struct erofs_buf *buf);
+void erofs_put_metabuf(struct erofs_buf *buf);
+void *erofs_bread(struct erofs_buf *buf, erofs_off_t offset, bool need_kmap);
+int erofs_init_metabuf(struct erofs_buf *buf, struct super_block *sb,
+		       bool in_metabox);
+void *erofs_read_metabuf(struct erofs_buf *buf, struct super_block *sb,
+			 erofs_off_t offset, bool in_metabox);
+int erofs_map_dev(struct super_block *sb, struct erofs_map_dev *dev);
+int erofs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
+		 u64 start, u64 len);
+int erofs_map_blocks(struct inode *inode, struct erofs_map_blocks *map);
+void erofs_onlinefolio_init(struct folio *folio);
+void erofs_onlinefolio_split(struct folio *folio);
+void erofs_onlinefolio_end(struct folio *folio, int err, bool dirty);
+struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid);
+int erofs_getattr(struct mnt_idmap *idmap, const struct path *path,
+		  struct kstat *stat, u32 request_mask,
+		  unsigned int query_flags);
+int erofs_namei(struct inode *dir, const struct qstr *name,
+		erofs_nid_t *nid, unsigned int *d_type);
+
+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;
+}
+
+static inline const struct address_space_operations *
+erofs_get_aops(struct inode *realinode)
+{
+	if (erofs_inode_is_data_compressed(EROFS_I(realinode)->datalayout)) {
+		if (!IS_ENABLED(CONFIG_EROFS_FS_ZIP))
+			return ERR_PTR(-EOPNOTSUPP);
+		DO_ONCE_LITE_IF(realinode->i_blkbits != PAGE_SHIFT,
+			  erofs_info, realinode->i_sb,
+			  "EXPERIMENTAL EROFS subpage compressed block support in use. Use at your own risk!");
+		return &z_erofs_aops;
+	}
+	if (IS_ENABLED(CONFIG_EROFS_FS_BACKED_BY_FILE) &&
+	    erofs_is_fileio_mode(EROFS_SB(realinode->i_sb)))
+		return &erofs_fileio_aops;
+	return &erofs_aops;
+}
+
+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, bool tryrsv);
+static inline struct page *erofs_allocpage(struct page **pagepool, gfp_t gfp)
+{
+	return __erofs_allocpage(pagepool, gfp, false);
+}
+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
+#define MNGD_MAPPING(sbi)	((sbi)->managed_cache->i_mapping)
+
+extern atomic_long_t erofs_global_shrink_cnt;
+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_subsystem(void);
+void z_erofs_exit_subsystem(void);
+int z_erofs_init_super(struct super_block *sb);
+unsigned long z_erofs_shrink_scan(struct erofs_sb_info *sbi,
+				  unsigned long nr_shrink);
+int z_erofs_map_blocks_iter(struct inode *inode, struct erofs_map_blocks *map,
+			    int flags);
+void *z_erofs_get_gbuf(unsigned int requiredpages);
+void z_erofs_put_gbuf(void *ptr);
+int z_erofs_gbuf_growsize(unsigned int nrpages);
+int __init z_erofs_gbuf_init(void);
+void z_erofs_gbuf_exit(void);
+#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_subsystem(void) { return 0; }
+static inline void z_erofs_exit_subsystem(void) {}
+static inline int z_erofs_init_super(struct super_block *sb) { return 0; }
+#endif	/* !CONFIG_EROFS_FS_ZIP */
+int z_erofs_parse_cfgs(struct super_block *sb, struct erofs_super_block *dsb);
+
+#ifdef CONFIG_EROFS_FS_BACKED_BY_FILE
+struct bio *erofs_fileio_bio_alloc(struct erofs_map_dev *mdev);
+void erofs_fileio_submit_bio(struct bio *bio);
+#else
+static inline struct bio *erofs_fileio_bio_alloc(struct erofs_map_dev *mdev) { return NULL; }
+static inline void erofs_fileio_submit_bio(struct bio *bio) {}
+#endif
+
+#ifdef CONFIG_EROFS_FS_PAGE_CACHE_SHARE
+int __init erofs_init_ishare(void);
+void erofs_exit_ishare(void);
+bool erofs_ishare_fill_inode(struct inode *inode);
+void erofs_ishare_free_inode(struct inode *inode);
+struct inode *erofs_real_inode(struct inode *inode, bool *need_iput);
+#else
+static inline int erofs_init_ishare(void) { return 0; }
+static inline void erofs_exit_ishare(void) {}
+static inline bool erofs_ishare_fill_inode(struct inode *inode) { return false; }
+static inline void erofs_ishare_free_inode(struct inode *inode) {}
+static inline struct inode *erofs_real_inode(struct inode *inode, bool *need_iput)
+{
+	*need_iput = false;
+	return inode;
+}
+#endif
+
+long erofs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
+long erofs_compat_ioctl(struct file *filp, unsigned int cmd,
+			unsigned long arg);
+
+#endif	/* __EROFS_INTERNAL_H */