/* * ncplib_kernel.h * * Copyright (C) 1995, 1996 by Volker Lendecke * Modified for big endian by J.F. Chadima and David S. Miller * Modified 1997 Peter Waltenberg, Bill Hawes, David Woodhouse for 2.1 dcache * Modified 1998, 1999 Wolfram Pienkoss for NLS * Modified 1999 Wolfram Pienkoss for directory caching * */ #ifndef _NCPLIB_H #define _NCPLIB_H #include #include #include #include #include #include #include #include #include #include #include #ifdef CONFIG_NCPFS_NLS #include #else #include #endif /* CONFIG_NCPFS_NLS */ #define NCP_MIN_SYMLINK_SIZE 8 #define NCP_MAX_SYMLINK_SIZE 512 #define NCP_BLOCK_SHIFT 9 #define NCP_BLOCK_SIZE (1 << (NCP_BLOCK_SHIFT)) int ncp_negotiate_buffersize(struct ncp_server *, int, int *); int ncp_negotiate_size_and_options(struct ncp_server *server, int size, int options, int *ret_size, int *ret_options); int ncp_get_volume_info_with_number(struct ncp_server* server, int n, struct ncp_volume_info *target); int ncp_get_directory_info(struct ncp_server* server, __u8 dirhandle, struct ncp_volume_info* target); int ncp_close_file(struct ncp_server *, const char *); static inline int ncp_read_bounce_size(__u32 size) { return sizeof(struct ncp_reply_header) + 2 + 2 + size + 8; }; int ncp_read_bounce(struct ncp_server *, const char *, __u32, __u16, struct iov_iter *, int *, void *bounce, __u32 bouncelen); int ncp_read_kernel(struct ncp_server *, const char *, __u32, __u16, char *, int *); int ncp_write_kernel(struct ncp_server *, const char *, __u32, __u16, const char *, int *); static inline void ncp_inode_close(struct inode *inode) { atomic_dec(&NCP_FINFO(inode)->opened); } void ncp_extract_file_info(const void* src, struct nw_info_struct* target); int ncp_obtain_info(struct ncp_server *server, struct inode *, const char *, struct nw_info_struct *target); int ncp_obtain_nfs_info(struct ncp_server *server, struct nw_info_struct *target); int ncp_update_known_namespace(struct ncp_server *server, __u8 volume, int *ret_ns); int ncp_get_volume_root(struct ncp_server *server, const char *volname, __u32 *volume, __le32 *dirent, __le32 *dosdirent); int ncp_lookup_volume(struct ncp_server *, const char *, struct nw_info_struct *); int ncp_modify_file_or_subdir_dos_info(struct ncp_server *, struct inode *, __le32, const struct nw_modify_dos_info *info); int ncp_modify_file_or_subdir_dos_info_path(struct ncp_server *, struct inode *, const char* path, __le32, const struct nw_modify_dos_info *info); int ncp_modify_nfs_info(struct ncp_server *, __u8 volnum, __le32 dirent, __u32 mode, __u32 rdev); int ncp_del_file_or_subdir2(struct ncp_server *, struct dentry*); int ncp_del_file_or_subdir(struct ncp_server *, struct inode *, const char *); int ncp_open_create_file_or_subdir(struct ncp_server *, struct inode *, const char *, int, __le32, __le16, struct ncp_entry_info *); int ncp_initialize_search(struct ncp_server *, struct inode *, struct nw_search_sequence *target); int ncp_search_for_fileset(struct ncp_server *server, struct nw_search_sequence *seq, int* more, int* cnt, char* buffer, size_t bufsize, char** rbuf, size_t* rsize); int ncp_ren_or_mov_file_or_subdir(struct ncp_server *server, struct inode *, const char *, struct inode *, const char *); int ncp_LogPhysicalRecord(struct ncp_server *server, const char *file_id, __u8 locktype, __u32 offset, __u32 length, __u16 timeout); #ifdef CONFIG_NCPFS_IOCTL_LOCKING int ncp_ClearPhysicalRecord(struct ncp_server *server, const char *file_id, __u32 offset, __u32 length); #endif /* CONFIG_NCPFS_IOCTL_LOCKING */ int ncp_mount_subdir(struct ncp_server *, __u8, __u8, __le32, __u32* volume, __le32* dirent, __le32* dosdirent); int ncp_dirhandle_alloc(struct ncp_server *, __u8 vol, __le32 dirent, __u8 *dirhandle); int ncp_dirhandle_free(struct ncp_server *, __u8 dirhandle); int ncp_create_new(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev, __le32 attributes); static inline int ncp_is_nfs_extras(struct ncp_server* server, unsigned int volnum) { #ifdef CONFIG_NCPFS_NFS_NS return (server->m.flags & NCP_MOUNT_NFS_EXTRAS) && (server->name_space[volnum] == NW_NS_NFS); #else return 0; #endif } #ifdef CONFIG_NCPFS_NLS int ncp__io2vol(struct ncp_server *, unsigned char *, unsigned int *, const unsigned char *, unsigned int, int); int ncp__vol2io(struct ncp_server *, unsigned char *, unsigned int *, const unsigned char *, unsigned int, int); #define NCP_ESC ':' #define NCP_IO_TABLE(sb) (NCP_SBP(sb)->nls_io) #define ncp_tolower(t, c) nls_tolower(t, c) #define ncp_toupper(t, c) nls_toupper(t, c) #define ncp_strnicmp(t, s1, s2, len) \ nls_strnicmp(t, s1, s2, len) #define ncp_io2vol(S,m,i,n,k,U) ncp__io2vol(S,m,i,n,k,U) #define ncp_vol2io(S,m,i,n,k,U) ncp__vol2io(S,m,i,n,k,U) #else int ncp__io2vol(unsigned char *, unsigned int *, const unsigned char *, unsigned int, int); int ncp__vol2io(unsigned char *, unsigned int *, const unsigned char *, unsigned int, int); #define NCP_IO_TABLE(sb) NULL #define ncp_tolower(t, c) tolower(c) #define ncp_toupper(t, c) toupper(c) #define ncp_io2vol(S,m,i,n,k,U) ncp__io2vol(m,i,n,k,U) #define ncp_vol2io(S,m,i,n,k,U) ncp__vol2io(m,i,n,k,U) static inline int ncp_strnicmp(const struct nls_table *t, const unsigned char *s1, const unsigned char *s2, int len) { while (len--) { if (tolower(*s1++) != tolower(*s2++)) return 1; } return 0; } #endif /* CONFIG_NCPFS_NLS */ #define NCP_GET_AGE(dentry) (jiffies - (dentry)->d_time) #define NCP_MAX_AGE(server) atomic_read(&(server)->dentry_ttl) #define NCP_TEST_AGE(server,dentry) (NCP_GET_AGE(dentry) < NCP_MAX_AGE(server)) static inline void ncp_age_dentry(struct ncp_server* server, struct dentry* dentry) { dentry->d_time = jiffies - NCP_MAX_AGE(server); } static inline void ncp_new_dentry(struct dentry* dentry) { dentry->d_time = jiffies; } struct ncp_cache_head { time_t mtime; unsigned long time; /* cache age */ unsigned long end; /* last valid fpos in cache */ int eof; }; #define NCP_DIRCACHE_SIZE ((int)(PAGE_SIZE/sizeof(struct dentry *))) union ncp_dir_cache { struct ncp_cache_head head; struct dentry *dentry[NCP_DIRCACHE_SIZE]; }; #define NCP_FIRSTCACHE_SIZE ((int)((NCP_DIRCACHE_SIZE * \ sizeof(struct dentry *) - sizeof(struct ncp_cache_head)) / \ sizeof(struct dentry *))) #define NCP_DIRCACHE_START (NCP_DIRCACHE_SIZE - NCP_FIRSTCACHE_SIZE) struct ncp_cache_control { struct ncp_cache_head head; struct page *page; union ncp_dir_cache *cache; unsigned long fpos, ofs; int filled, valid, idx; }; #endif /* _NCPLIB_H */ f_put(). This was seen when performing CPU hotplug during I/O, as hangs in blk_mq_freeze_queue_wait where percpu_ref_kill (blk_mq_freeze_queue_start) raced with percpu_ref_tryget (blk_mq_timeout_work). Sample stack trace: __switch_to+0x2c0/0x450 __schedule+0x2f8/0x970 schedule+0x48/0xc0 blk_mq_freeze_queue_wait+0x94/0x120 blk_mq_queue_reinit_work+0xb8/0x180 blk_mq_queue_reinit_prepare+0x84/0xa0 cpuhp_invoke_callback+0x17c/0x600 cpuhp_up_callbacks+0x58/0x150 _cpu_up+0xf0/0x1c0 do_cpu_up+0x120/0x150 cpu_subsys_online+0x64/0xe0 device_online+0xb4/0x120 online_store+0xb4/0xc0 dev_attr_store+0x68/0xa0 sysfs_kf_write+0x80/0xb0 kernfs_fop_write+0x17c/0x250 __vfs_write+0x6c/0x1e0 vfs_write+0xd0/0x270 SyS_write+0x6c/0x110 system_call+0x38/0xe0 Examination of the queue showed a single reference (no PERCPU_COUNT_BIAS, and __PERCPU_REF_DEAD, __PERCPU_REF_ATOMIC set) and no requests. However, conditions at the time of the race are count of PERCPU_COUNT_BIAS + 0 and __PERCPU_REF_DEAD and __PERCPU_REF_ATOMIC set. The fix is to make the tryget routines use an actual boolean internally instead of the atomic long result truncated to a int. Fixes: e625305b3907 percpu-refcount: make percpu_ref based on longs instead of ints Link: https://bugzilla.kernel.org/show_bug.cgi?id=190751 Signed-off-by: Douglas Miller <dougmill@linux.vnet.ibm.com> Reviewed-by: Jens Axboe <axboe@fb.com> Signed-off-by: Tejun Heo <tj@kernel.org> Fixes: e625305b3907 ("percpu-refcount: make percpu_ref based on longs instead of ints") Cc: stable@vger.kernel.org # v3.18+
Diffstat (limited to 'sound/firewire/fcp.c')