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Diffstat (limited to 'include/linux/fs.h')
| -rw-r--r-- | include/linux/fs.h | 1677 |
1 files changed, 1677 insertions, 0 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h new file mode 100644 index 0000000..5df687d --- /dev/null +++ b/include/linux/fs.h @@ -0,0 +1,1677 @@ +#ifndef _LINUX_FS_H +#define _LINUX_FS_H + +/* + * This file has definitions for some important file table + * structures etc. + */ + +#include <linux/config.h> +#include <linux/limits.h> +#include <linux/ioctl.h> + +/* + * It's silly to have NR_OPEN bigger than NR_FILE, but you can change + * the file limit at runtime and only root can increase the per-process + * nr_file rlimit, so it's safe to set up a ridiculously high absolute + * upper limit on files-per-process. + * + * Some programs (notably those using select()) may have to be + * recompiled to take full advantage of the new limits.. + */ + +/* Fixed constants first: */ +#undef NR_OPEN +#define NR_OPEN (1024*1024) /* Absolute upper limit on fd num */ +#define INR_OPEN 1024 /* Initial setting for nfile rlimits */ + +#define BLOCK_SIZE_BITS 10 +#define BLOCK_SIZE (1<<BLOCK_SIZE_BITS) + +/* And dynamically-tunable limits and defaults: */ +struct files_stat_struct { + int nr_files; /* read only */ + int nr_free_files; /* read only */ + int max_files; /* tunable */ +}; +extern struct files_stat_struct files_stat; + +struct inodes_stat_t { + int nr_inodes; + int nr_unused; + int dummy[5]; +}; +extern struct inodes_stat_t inodes_stat; + +extern int leases_enable, lease_break_time; + +#ifdef CONFIG_DNOTIFY +extern int dir_notify_enable; +#endif + +#define NR_FILE 8192 /* this can well be larger on a larger system */ + +#define MAY_EXEC 1 +#define MAY_WRITE 2 +#define MAY_READ 4 +#define MAY_APPEND 8 + +#define FMODE_READ 1 +#define FMODE_WRITE 2 + +/* Internal kernel extensions */ +#define FMODE_LSEEK 4 +#define FMODE_PREAD 8 +#define FMODE_PWRITE FMODE_PREAD /* These go hand in hand */ + +#define RW_MASK 1 +#define RWA_MASK 2 +#define READ 0 +#define WRITE 1 +#define READA 2 /* read-ahead - don't block if no resources */ +#define SPECIAL 4 /* For non-blockdevice requests in request queue */ +#define READ_SYNC (READ | (1 << BIO_RW_SYNC)) +#define WRITE_SYNC (WRITE | (1 << BIO_RW_SYNC)) +#define WRITE_BARRIER ((1 << BIO_RW) | (1 << BIO_RW_BARRIER)) + +#define SEL_IN 1 +#define SEL_OUT 2 +#define SEL_EX 4 + +/* public flags for file_system_type */ +#define FS_REQUIRES_DEV 1 +#define FS_BINARY_MOUNTDATA 2 +#define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */ +#define FS_ODD_RENAME 32768 /* Temporary stuff; will go away as soon + * as nfs_rename() will be cleaned up + */ +/* + * These are the fs-independent mount-flags: up to 32 flags are supported + */ +#define MS_RDONLY 1 /* Mount read-only */ +#define MS_NOSUID 2 /* Ignore suid and sgid bits */ +#define MS_NODEV 4 /* Disallow access to device special files */ +#define MS_NOEXEC 8 /* Disallow program execution */ +#define MS_SYNCHRONOUS 16 /* Writes are synced at once */ +#define MS_REMOUNT 32 /* Alter flags of a mounted FS */ +#define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */ +#define MS_DIRSYNC 128 /* Directory modifications are synchronous */ +#define MS_NOATIME 1024 /* Do not update access times. */ +#define MS_NODIRATIME 2048 /* Do not update directory access times */ +#define MS_BIND 4096 +#define MS_MOVE 8192 +#define MS_REC 16384 +#define MS_VERBOSE 32768 +#define MS_POSIXACL (1<<16) /* VFS does not apply the umask */ +#define MS_ACTIVE (1<<30) +#define MS_NOUSER (1<<31) + +/* + * Superblock flags that can be altered by MS_REMOUNT + */ +#define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_NOATIME|\ + MS_NODIRATIME) + +/* + * Old magic mount flag and mask + */ +#define MS_MGC_VAL 0xC0ED0000 +#define MS_MGC_MSK 0xffff0000 + +/* Inode flags - they have nothing to superblock flags now */ + +#define S_SYNC 1 /* Writes are synced at once */ +#define S_NOATIME 2 /* Do not update access times */ +#define S_APPEND 4 /* Append-only file */ +#define S_IMMUTABLE 8 /* Immutable file */ +#define S_DEAD 16 /* removed, but still open directory */ +#define S_NOQUOTA 32 /* Inode is not counted to quota */ +#define S_DIRSYNC 64 /* Directory modifications are synchronous */ +#define S_NOCMTIME 128 /* Do not update file c/mtime */ +#define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */ +#define S_PRIVATE 512 /* Inode is fs-internal */ + +/* + * Note that nosuid etc flags are inode-specific: setting some file-system + * flags just means all the inodes inherit those flags by default. It might be + * possible to override it selectively if you really wanted to with some + * ioctl() that is not currently implemented. + * + * Exception: MS_RDONLY is always applied to the entire file system. + * + * Unfortunately, it is possible to change a filesystems flags with it mounted + * with files in use. This means that all of the inodes will not have their + * i_flags updated. Hence, i_flags no longer inherit the superblock mount + * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org + */ +#define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg)) + +#define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY) +#define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \ + ((inode)->i_flags & S_SYNC)) +#define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \ + ((inode)->i_flags & (S_SYNC|S_DIRSYNC))) +#define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK) + +#define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA) +#define IS_APPEND(inode) ((inode)->i_flags & S_APPEND) +#define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE) +#define IS_NOATIME(inode) (__IS_FLG(inode, MS_NOATIME) || ((inode)->i_flags & S_NOATIME)) +#define IS_NODIRATIME(inode) __IS_FLG(inode, MS_NODIRATIME) +#define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL) + +#define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD) +#define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME) +#define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE) +#define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE) + +/* the read-only stuff doesn't really belong here, but any other place is + probably as bad and I don't want to create yet another include file. */ + +#define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */ +#define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */ +#define BLKRRPART _IO(0x12,95) /* re-read partition table */ +#define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */ +#define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */ +#define BLKRASET _IO(0x12,98) /* set read ahead for block device */ +#define BLKRAGET _IO(0x12,99) /* get current read ahead setting */ +#define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */ +#define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */ +#define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */ +#define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */ +#define BLKSSZGET _IO(0x12,104)/* get block device sector size */ +#if 0 +#define BLKPG _IO(0x12,105)/* See blkpg.h */ + +/* Some people are morons. Do not use sizeof! */ + +#define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */ +#define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */ +/* This was here just to show that the number is taken - + probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */ +#endif +/* A jump here: 108-111 have been used for various private purposes. */ +#define BLKBSZGET _IOR(0x12,112,size_t) +#define BLKBSZSET _IOW(0x12,113,size_t) +#define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */ + +#define BMAP_IOCTL 1 /* obsolete - kept for compatibility */ +#define FIBMAP _IO(0x00,1) /* bmap access */ +#define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */ + +#ifdef __KERNEL__ + +#include <linux/linkage.h> +#include <linux/wait.h> +#include <linux/types.h> +#include <linux/kdev_t.h> +#include <linux/dcache.h> +#include <linux/stat.h> +#include <linux/cache.h> +#include <linux/kobject.h> +#include <linux/list.h> +#include <linux/radix-tree.h> +#include <linux/prio_tree.h> +#include <linux/init.h> + +#include <asm/atomic.h> +#include <asm/semaphore.h> +#include <asm/byteorder.h> + +struct iovec; +struct nameidata; +struct pipe_inode_info; +struct poll_table_struct; +struct kstatfs; +struct vm_area_struct; +struct vfsmount; + +/* Used to be a macro which just called the function, now just a function */ +extern void update_atime (struct inode *); + +extern void __init inode_init(unsigned long); +extern void __init inode_init_early(void); +extern void __init mnt_init(unsigned long); +extern void __init files_init(unsigned long); + +struct buffer_head; +typedef int (get_block_t)(struct inode *inode, sector_t iblock, + struct buffer_head *bh_result, int create); +typedef int (get_blocks_t)(struct inode *inode, sector_t iblock, + unsigned long max_blocks, + struct buffer_head *bh_result, int create); +typedef void (dio_iodone_t)(struct inode *inode, loff_t offset, + ssize_t bytes, void *private); + +/* + * Attribute flags. These should be or-ed together to figure out what + * has been changed! + */ +#define ATTR_MODE 1 +#define ATTR_UID 2 +#define ATTR_GID 4 +#define ATTR_SIZE 8 +#define ATTR_ATIME 16 +#define ATTR_MTIME 32 +#define ATTR_CTIME 64 +#define ATTR_ATIME_SET 128 +#define ATTR_MTIME_SET 256 +#define ATTR_FORCE 512 /* Not a change, but a change it */ +#define ATTR_ATTR_FLAG 1024 +#define ATTR_KILL_SUID 2048 +#define ATTR_KILL_SGID 4096 + +/* + * This is the Inode Attributes structure, used for notify_change(). It + * uses the above definitions as flags, to know which values have changed. + * Also, in this manner, a Filesystem can look at only the values it cares + * about. Basically, these are the attributes that the VFS layer can + * request to change from the FS layer. + * + * Derek Atkins <warlord@MIT.EDU> 94-10-20 + */ +struct iattr { + unsigned int ia_valid; + umode_t ia_mode; + uid_t ia_uid; + gid_t ia_gid; + loff_t ia_size; + struct timespec ia_atime; + struct timespec ia_mtime; + struct timespec ia_ctime; + unsigned int ia_attr_flags; +}; + +/* + * This is the inode attributes flag definitions + */ +#define ATTR_FLAG_SYNCRONOUS 1 /* Syncronous write */ +#define ATTR_FLAG_NOATIME 2 /* Don't update atime */ +#define ATTR_FLAG_APPEND 4 /* Append-only file */ +#define ATTR_FLAG_IMMUTABLE 8 /* Immutable file */ +#define ATTR_FLAG_NODIRATIME 16 /* Don't update atime for directory */ + +/* + * Includes for diskquotas. + */ +#include <linux/quota.h> + +/* + * oh the beauties of C type declarations. + */ +struct page; +struct address_space; +struct writeback_control; +struct kiocb; + +struct address_space_operations { + int (*writepage)(struct page *page, struct writeback_control *wbc); + int (*readpage)(struct file *, struct page *); + int (*sync_page)(struct page *); + + /* Write back some dirty pages from this mapping. */ + int (*writepages)(struct address_space *, struct writeback_control *); + + /* Set a page dirty */ + int (*set_page_dirty)(struct page *page); + + int (*readpages)(struct file *filp, struct address_space *mapping, + struct list_head *pages, unsigned nr_pages); + + /* + * ext3 requires that a successful prepare_write() call be followed + * by a commit_write() call - they must be balanced + */ + int (*prepare_write)(struct file *, struct page *, unsigned, unsigned); + int (*commit_write)(struct file *, struct page *, unsigned, unsigned); + /* Unfortunately this kludge is needed for FIBMAP. Don't use it */ + sector_t (*bmap)(struct address_space *, sector_t); + int (*invalidatepage) (struct page *, unsigned long); + int (*releasepage) (struct page *, int); + ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov, + loff_t offset, unsigned long nr_segs); +}; + +struct backing_dev_info; +struct address_space { + struct inode *host; /* owner: inode, block_device */ + struct radix_tree_root page_tree; /* radix tree of all pages */ + rwlock_t tree_lock; /* and rwlock protecting it */ + unsigned int i_mmap_writable;/* count VM_SHARED mappings */ + struct prio_tree_root i_mmap; /* tree of private and shared mappings */ + struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */ + spinlock_t i_mmap_lock; /* protect tree, count, list */ + unsigned int truncate_count; /* Cover race condition with truncate */ + unsigned long nrpages; /* number of total pages */ + pgoff_t writeback_index;/* writeback starts here */ + struct address_space_operations *a_ops; /* methods */ + unsigned long flags; /* error bits/gfp mask */ + struct backing_dev_info *backing_dev_info; /* device readahead, etc */ + spinlock_t private_lock; /* for use by the address_space */ + struct list_head private_list; /* ditto */ + struct address_space *assoc_mapping; /* ditto */ +} __attribute__((aligned(sizeof(long)))); + /* + * On most architectures that alignment is already the case; but + * must be enforced here for CRIS, to let the least signficant bit + * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON. + */ + +struct block_device { + dev_t bd_dev; /* not a kdev_t - it's a search key */ + struct inode * bd_inode; /* will die */ + int bd_openers; + struct semaphore bd_sem; /* open/close mutex */ + struct semaphore bd_mount_sem; /* mount mutex */ + struct list_head bd_inodes; + void * bd_holder; + int bd_holders; + struct block_device * bd_contains; + unsigned bd_block_size; + struct hd_struct * bd_part; + /* number of times partitions within this device have been opened. */ + unsigned bd_part_count; + int bd_invalidated; + struct gendisk * bd_disk; + struct list_head bd_list; + struct backing_dev_info *bd_inode_backing_dev_info; + /* + * Private data. You must have bd_claim'ed the block_device + * to use this. NOTE: bd_claim allows an owner to claim + * the same device multiple times, the owner must take special + * care to not mess up bd_private for that case. + */ + unsigned long bd_private; +}; + +/* + * Radix-tree tags, for tagging dirty and writeback pages within the pagecache + * radix trees + */ +#define PAGECACHE_TAG_DIRTY 0 +#define PAGECACHE_TAG_WRITEBACK 1 + +int mapping_tagged(struct address_space *mapping, int tag); + +/* + * Might pages of this file be mapped into userspace? + */ +static inline int mapping_mapped(struct address_space *mapping) +{ + return !prio_tree_empty(&mapping->i_mmap) || + !list_empty(&mapping->i_mmap_nonlinear); +} + +/* + * Might pages of this file have been modified in userspace? + * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff + * marks vma as VM_SHARED if it is shared, and the file was opened for + * writing i.e. vma may be mprotected writable even if now readonly. + */ +static inline int mapping_writably_mapped(struct address_space *mapping) +{ + return mapping->i_mmap_writable != 0; +} + +/* + * Use sequence counter to get consistent i_size on 32-bit processors. + */ +#if BITS_PER_LONG==32 && defined(CONFIG_SMP) +#include <linux/seqlock.h> +#define __NEED_I_SIZE_ORDERED +#define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount) +#else +#define i_size_ordered_init(inode) do { } while (0) +#endif + +struct inode { + struct hlist_node i_hash; + struct list_head i_list; + struct list_head i_sb_list; + struct list_head i_dentry; + unsigned long i_ino; + atomic_t i_count; + umode_t i_mode; + unsigned int i_nlink; + uid_t i_uid; + gid_t i_gid; + dev_t i_rdev; + loff_t i_size; + struct timespec i_atime; + struct timespec i_mtime; + struct timespec i_ctime; + unsigned int i_blkbits; + unsigned long i_blksize; + unsigned long i_version; + unsigned long i_blocks; + unsigned short i_bytes; + spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ + struct semaphore i_sem; + struct rw_semaphore i_alloc_sem; + struct inode_operations *i_op; + struct file_operations *i_fop; /* former ->i_op->default_file_ops */ + struct super_block *i_sb; + struct file_lock *i_flock; + struct address_space *i_mapping; + struct address_space i_data; +#ifdef CONFIG_QUOTA + struct dquot *i_dquot[MAXQUOTAS]; +#endif + /* These three should probably be a union */ + struct list_head i_devices; + struct pipe_inode_info *i_pipe; + struct block_device *i_bdev; + struct cdev *i_cdev; + int i_cindex; + + __u32 i_generation; + +#ifdef CONFIG_DNOTIFY + unsigned long i_dnotify_mask; /* Directory notify events */ + struct dnotify_struct *i_dnotify; /* for directory notifications */ +#endif + + unsigned long i_state; + unsigned long dirtied_when; /* jiffies of first dirtying */ + + unsigned int i_flags; + + atomic_t i_writecount; + void *i_security; + union { + void *generic_ip; + } u; +#ifdef __NEED_I_SIZE_ORDERED + seqcount_t i_size_seqcount; +#endif +}; + +/* + * NOTE: in a 32bit arch with a preemptable kernel and + * an UP compile the i_size_read/write must be atomic + * with respect to the local cpu (unlike with preempt disabled), + * but they don't need to be atomic with respect to other cpus like in + * true SMP (so they need either to either locally disable irq around + * the read or for example on x86 they can be still implemented as a + * cmpxchg8b without the need of the lock prefix). For SMP compiles + * and 64bit archs it makes no difference if preempt is enabled or not. + */ +static inline loff_t i_size_read(struct inode *inode) +{ +#if BITS_PER_LONG==32 && defined(CONFIG_SMP) + loff_t i_size; + unsigned int seq; + + do { + seq = read_seqcount_begin(&inode->i_size_seqcount); + i_size = inode->i_size; + } while (read_seqcount_retry(&inode->i_size_seqcount, seq)); + return i_size; +#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) + loff_t i_size; + + preempt_disable(); + i_size = inode->i_size; + preempt_enable(); + return i_size; +#else + return inode->i_size; +#endif +} + + +static inline void i_size_write(struct inode *inode, loff_t i_size) +{ +#if BITS_PER_LONG==32 && defined(CONFIG_SMP) + write_seqcount_begin(&inode->i_size_seqcount); + inode->i_size = i_size; + write_seqcount_end(&inode->i_size_seqcount); +#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) + preempt_disable(); + inode->i_size = i_size; + preempt_enable(); +#else + inode->i_size = i_size; +#endif +} + +static inline unsigned iminor(struct inode *inode) +{ + return MINOR(inode->i_rdev); +} + +static inline unsigned imajor(struct inode *inode) +{ + return MAJOR(inode->i_rdev); +} + +extern struct block_device *I_BDEV(struct inode *inode); + +struct fown_struct { + rwlock_t lock; /* protects pid, uid, euid fields */ + int pid; /* pid or -pgrp where SIGIO should be sent */ + uid_t uid, euid; /* uid/euid of process setting the owner */ + void *security; + int signum; /* posix.1b rt signal to be delivered on IO */ +}; + +/* + * Track a single file's readahead state + */ +struct file_ra_state { + unsigned long start; /* Current window */ + unsigned long size; + unsigned long flags; /* ra flags RA_FLAG_xxx*/ + unsigned long cache_hit; /* cache hit count*/ + unsigned long prev_page; /* Cache last read() position */ + unsigned long ahead_start; /* Ahead window */ + unsigned long ahead_size; + unsigned long ra_pages; /* Maximum readahead window */ + unsigned long mmap_hit; /* Cache hit stat for mmap accesses */ + unsigned long mmap_miss; /* Cache miss stat for mmap accesses */ +}; +#define RA_FLAG_MISS 0x01 /* a cache miss occured against this file */ +#define RA_FLAG_INCACHE 0x02 /* file is already in cache */ + +struct file { + struct list_head f_list; + struct dentry *f_dentry; + struct vfsmount *f_vfsmnt; + struct file_operations *f_op; + atomic_t f_count; + unsigned int f_flags; + mode_t f_mode; + int f_error; + loff_t f_pos; + struct fown_struct f_owner; + unsigned int f_uid, f_gid; + struct file_ra_state f_ra; + + size_t f_maxcount; + unsigned long f_version; + void *f_security; + + /* needed for tty driver, and maybe others */ + void *private_data; + +#ifdef CONFIG_EPOLL + /* Used by fs/eventpoll.c to link all the hooks to this file */ + struct list_head f_ep_links; + spinlock_t f_ep_lock; +#endif /* #ifdef CONFIG_EPOLL */ + struct address_space *f_mapping; +}; +extern spinlock_t files_lock; +#define file_list_lock() spin_lock(&files_lock); +#define file_list_unlock() spin_unlock(&files_lock); + +#define get_file(x) atomic_inc(&(x)->f_count) +#define file_count(x) atomic_read(&(x)->f_count) + +#define MAX_NON_LFS ((1UL<<31) - 1) + +/* Page cache limit. The filesystems should put that into their s_maxbytes + limits, otherwise bad things can happen in VM. */ +#if BITS_PER_LONG==32 +#define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) +#elif BITS_PER_LONG==64 +#define MAX_LFS_FILESIZE 0x7fffffffffffffffUL +#endif + +#define FL_POSIX 1 +#define FL_FLOCK 2 +#define FL_ACCESS 8 /* not trying to lock, just looking */ +#define FL_LOCKD 16 /* lock held by rpc.lockd */ +#define FL_LEASE 32 /* lease held on this file */ +#define FL_SLEEP 128 /* A blocking lock */ + +/* + * The POSIX file lock owner is determined by + * the "struct files_struct" in the thread group + * (or NULL for no owner - BSD locks). + * + * Lockd stuffs a "host" pointer into this. + */ +typedef struct files_struct *fl_owner_t; + +struct file_lock_operations { + void (*fl_insert)(struct file_lock *); /* lock insertion callback */ + void (*fl_remove)(struct file_lock *); /* lock removal callback */ + void (*fl_copy_lock)(struct file_lock *, struct file_lock *); + void (*fl_release_private)(struct file_lock *); +}; + +struct lock_manager_operations { + int (*fl_compare_owner)(struct file_lock *, struct file_lock *); + void (*fl_notify)(struct file_lock *); /* unblock callback */ + void (*fl_copy_lock)(struct file_lock *, struct file_lock *); + void (*fl_release_private)(struct file_lock *); + void (*fl_break)(struct file_lock *); + int (*fl_mylease)(struct file_lock *, struct file_lock *); + int (*fl_change)(struct file_lock **, int); +}; + +/* that will die - we need it for nfs_lock_info */ +#include <linux/nfs_fs_i.h> + +struct file_lock { + struct file_lock *fl_next; /* singly linked list for this inode */ + struct list_head fl_link; /* doubly linked list of all locks */ + struct list_head fl_block; /* circular list of blocked processes */ + fl_owner_t fl_owner; + unsigned int fl_pid; + wait_queue_head_t fl_wait; + struct file *fl_file; + unsigned char fl_flags; + unsigned char fl_type; + loff_t fl_start; + loff_t fl_end; + + struct fasync_struct * fl_fasync; /* for lease break notifications */ + unsigned long fl_break_time; /* for nonblocking lease breaks */ + + struct file_lock_operations *fl_ops; /* Callbacks for filesystems */ + struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */ + union { + struct nfs_lock_info nfs_fl; + } fl_u; +}; + +/* The following constant reflects the upper bound of the file/locking space */ +#ifndef OFFSET_MAX +#define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1))) +#define OFFSET_MAX INT_LIMIT(loff_t) +#define OFFT_OFFSET_MAX INT_LIMIT(off_t) +#endif + +extern struct list_head file_lock_list; + +#include <linux/fcntl.h> + +extern int fcntl_getlk(struct file *, struct flock __user *); +extern int fcntl_setlk(struct file *, unsigned int, struct flock __user *); + +#if BITS_PER_LONG == 32 +extern int fcntl_getlk64(struct file *, struct flock64 __user *); +extern int fcntl_setlk64(struct file *, unsigned int, struct flock64 __user *); +#endif + +extern void send_sigio(struct fown_struct *fown, int fd, int band); +extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg); +extern int fcntl_getlease(struct file *filp); + +/* fs/locks.c */ +extern void locks_init_lock(struct file_lock *); +extern void locks_copy_lock(struct file_lock *, struct file_lock *); +extern void locks_remove_posix(struct file *, fl_owner_t); +extern void locks_remove_flock(struct file *); +extern struct file_lock *posix_test_lock(struct file *, struct file_lock *); +extern int posix_lock_file(struct file *, struct file_lock *); +extern int posix_lock_file_wait(struct file *, struct file_lock *); +extern void posix_block_lock(struct file_lock *, struct file_lock *); +extern void posix_unblock_lock(struct file *, struct file_lock *); +extern int posix_locks_deadlock(struct file_lock *, struct file_lock *); +extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl); +extern int __break_lease(struct inode *inode, unsigned int flags); +extern void lease_get_mtime(struct inode *, struct timespec *time); +extern int setlease(struct file *, long, struct file_lock **); +extern int lease_modify(struct file_lock **, int); +extern int lock_may_read(struct inode *, loff_t start, unsigned long count); +extern int lock_may_write(struct inode *, loff_t start, unsigned long count); +extern void steal_locks(fl_owner_t from); + +struct fasync_struct { + int magic; + int fa_fd; + struct fasync_struct *fa_next; /* singly linked list */ + struct file *fa_file; +}; + +#define FASYNC_MAGIC 0x4601 + +/* SMP safe fasync helpers: */ +extern int fasync_helper(int, struct file *, int, struct fasync_struct **); +/* can be called from interrupts */ +extern void kill_fasync(struct fasync_struct **, int, int); +/* only for net: no internal synchronization */ +extern void __kill_fasync(struct fasync_struct *, int, int); + +extern int f_setown(struct file *filp, unsigned long arg, int force); +extern void f_delown(struct file *filp); +extern int send_sigurg(struct fown_struct *fown); + +/* + * Umount options + */ + +#define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */ +#define MNT_DETACH 0x00000002 /* Just detach from the tree */ +#define MNT_EXPIRE 0x00000004 /* Mark for expiry */ + +extern struct list_head super_blocks; +extern spinlock_t sb_lock; + +#define sb_entry(list) list_entry((list), struct super_block, s_list) +#define S_BIAS (1<<30) +struct super_block { + struct list_head s_list; /* Keep this first */ + dev_t s_dev; /* search index; _not_ kdev_t */ + unsigned long s_blocksize; + unsigned long s_old_blocksize; + unsigned char s_blocksize_bits; + unsigned char s_dirt; + unsigned long long s_maxbytes; /* Max file size */ + struct file_system_type *s_type; + struct super_operations *s_op; + struct dquot_operations *dq_op; + struct quotactl_ops *s_qcop; + struct export_operations *s_export_op; + unsigned long s_flags; + unsigned long s_magic; + struct dentry *s_root; + struct rw_semaphore s_umount; + struct semaphore s_lock; + int s_count; + int s_syncing; + int s_need_sync_fs; + atomic_t s_active; + void *s_security; + struct xattr_handler **s_xattr; + + struct list_head s_inodes; /* all inodes */ + struct list_head s_dirty; /* dirty inodes */ + struct list_head s_io; /* parked for writeback */ + struct hlist_head s_anon; /* anonymous dentries for (nfs) exporting */ + struct list_head s_files; + + struct block_device *s_bdev; + struct list_head s_instances; + struct quota_info s_dquot; /* Diskquota specific options */ + + int s_frozen; + wait_queue_head_t s_wait_unfrozen; + + char s_id[32]; /* Informational name */ + + void *s_fs_info; /* Filesystem private info */ + + /* + * The next field is for VFS *only*. No filesystems have any business + * even looking at it. You had been warned. + */ + struct semaphore s_vfs_rename_sem; /* Kludge */ + + /* Granuality of c/m/atime in ns. + Cannot be worse than a second */ + u32 s_time_gran; +}; + +extern struct timespec current_fs_time(struct super_block *sb); + +/* + * Snapshotting support. + */ +enum { + SB_UNFROZEN = 0, + SB_FREEZE_WRITE = 1, + SB_FREEZE_TRANS = 2, +}; + +#define vfs_check_frozen(sb, level) \ + wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level))) + +/* + * Superblock locking. + */ +static inline void lock_super(struct super_block * sb) +{ + down(&sb->s_lock); +} + +static inline void unlock_super(struct super_block * sb) +{ + up(&sb->s_lock); +} + +/* + * VFS helper functions.. + */ +extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *); +extern int vfs_mkdir(struct inode *, struct dentry *, int); +extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t); +extern int vfs_symlink(struct inode *, struct dentry *, const char *, int); +extern int vfs_link(struct dentry *, struct inode *, struct dentry *); +extern int vfs_rmdir(struct inode *, struct dentry *); +extern int vfs_unlink(struct inode *, struct dentry *); +extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); + +/* + * VFS dentry helper functions. + */ +extern void dentry_unhash(struct dentry *dentry); + +/* + * File types + * + * NOTE! These match bits 12..15 of stat.st_mode + * (ie "(i_mode >> 12) & 15"). + */ +#define DT_UNKNOWN 0 +#define DT_FIFO 1 +#define DT_CHR 2 +#define DT_DIR 4 +#define DT_BLK 6 +#define DT_REG 8 +#define DT_LNK 10 +#define DT_SOCK 12 +#define DT_WHT 14 + +#define OSYNC_METADATA (1<<0) +#define OSYNC_DATA (1<<1) +#define OSYNC_INODE (1<<2) +int generic_osync_inode(struct inode *, struct address_space *, int); + +/* + * This is the "filldir" function type, used by readdir() to let + * the kernel specify what kind of dirent layout it wants to have. + * This allows the kernel to read directories into kernel space or + * to have different dirent layouts depending on the binary type. + */ +typedef int (*filldir_t)(void *, const char *, int, loff_t, ino_t, unsigned); + +struct block_device_operations { + int (*open) (struct inode *, struct file *); + int (*release) (struct inode *, struct file *); + int (*ioctl) (struct inode *, struct file *, unsigned, unsigned long); + long (*compat_ioctl) (struct file *, unsigned, unsigned long); + int (*media_changed) (struct gendisk *); + int (*revalidate_disk) (struct gendisk *); + struct module *owner; +}; + +/* + * "descriptor" for what we're up to with a read for sendfile(). + * This allows us to use the same read code yet + * have multiple different users of the data that + * we read from a file. + * + * The simplest case just copies the data to user + * mode. + */ +typedef struct { + size_t written; + size_t count; + union { + char __user * buf; + void *data; + } arg; + int error; +} read_descriptor_t; + +typedef int (*read_actor_t)(read_descriptor_t *, struct page *, unsigned long, unsigned long); + +/* These macros are for out of kernel modules to test that + * the kernel supports the unlocked_ioctl and compat_ioctl + * fields in struct file_operations. */ +#define HAVE_COMPAT_IOCTL 1 +#define HAVE_UNLOCKED_IOCTL 1 + +/* + * NOTE: + * read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl + * can be called without the big kernel lock held in all filesystems. + */ +struct file_operations { + struct module *owner; + loff_t (*llseek) (struct file *, loff_t, int); + ssize_t (*read) (struct file *, char __user *, size_t, loff_t *); + ssize_t (*aio_read) (struct kiocb *, char __user *, size_t, loff_t); + ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *); + ssize_t (*aio_write) (struct kiocb *, const char __user *, size_t, loff_t); + int (*readdir) (struct file *, void *, filldir_t); + unsigned int (*poll) (struct file *, struct poll_table_struct *); + int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long); + long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); + long (*compat_ioctl) (struct file *, unsigned int, unsigned long); + int (*mmap) (struct file *, struct vm_area_struct *); + int (*open) (struct inode *, struct file *); + int (*flush) (struct file *); + int (*release) (struct inode *, struct file *); + int (*fsync) (struct file *, struct dentry *, int datasync); + int (*aio_fsync) (struct kiocb *, int datasync); + int (*fasync) (int, struct file *, int); + int (*lock) (struct file *, int, struct file_lock *); + ssize_t (*readv) (struct file *, const struct iovec *, unsigned long, loff_t *); + ssize_t (*writev) (struct file *, const struct iovec *, unsigned long, loff_t *); + ssize_t (*sendfile) (struct file *, loff_t *, size_t, read_actor_t, void *); + ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int); + unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); + int (*check_flags)(int); + int (*dir_notify)(struct file *filp, unsigned long arg); + int (*flock) (struct file *, int, struct file_lock *); +}; + +struct inode_operations { + int (*create) (struct inode *,struct dentry *,int, struct nameidata *); + struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *); + int (*link) (struct dentry *,struct inode *,struct dentry *); + int (*unlink) (struct inode *,struct dentry *); + int (*symlink) (struct inode *,struct dentry *,const char *); + int (*mkdir) (struct inode *,struct dentry *,int); + int (*rmdir) (struct inode *,struct dentry *); + int (*mknod) (struct inode *,struct dentry *,int,dev_t); + int (*rename) (struct inode *, struct dentry *, + struct inode *, struct dentry *); + int (*readlink) (struct dentry *, char __user *,int); + int (*follow_link) (struct dentry *, struct nameidata *); + void (*put_link) (struct dentry *, struct nameidata *); + void (*truncate) (struct inode *); + int (*permission) (struct inode *, int, struct nameidata *); + int (*setattr) (struct dentry *, struct iattr *); + int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *); + int (*setxattr) (struct dentry *, const char *,const void *,size_t,int); + ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t); + ssize_t (*listxattr) (struct dentry *, char *, size_t); + int (*removexattr) (struct dentry *, const char *); +}; + +struct seq_file; + +extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *); +extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *); +extern ssize_t vfs_readv(struct file *, const struct iovec __user *, + unsigned long, loff_t *); +extern ssize_t vfs_writev(struct file *, const struct iovec __user *, + unsigned long, loff_t *); + +/* + * NOTE: write_inode, delete_inode, clear_inode, put_inode can be called + * without the big kernel lock held in all filesystems. + */ +struct super_operations { + struct inode *(*alloc_inode)(struct super_block *sb); + void (*destroy_inode)(struct inode *); + + void (*read_inode) (struct inode *); + + void (*dirty_inode) (struct inode *); + int (*write_inode) (struct inode *, int); + void (*put_inode) (struct inode *); + void (*drop_inode) (struct inode *); + void (*delete_inode) (struct inode *); + void (*put_super) (struct super_block *); + void (*write_super) (struct super_block *); + int (*sync_fs)(struct super_block *sb, int wait); + void (*write_super_lockfs) (struct super_block *); + void (*unlockfs) (struct super_block *); + int (*statfs) (struct super_block *, struct kstatfs *); + int (*remount_fs) (struct super_block *, int *, char *); + void (*clear_inode) (struct inode *); + void (*umount_begin) (struct super_block *); + + int (*show_options)(struct seq_file *, struct vfsmount *); + + ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t); + ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t); +}; + +/* Inode state bits. Protected by inode_lock. */ +#define I_DIRTY_SYNC 1 /* Not dirty enough for O_DATASYNC */ +#define I_DIRTY_DATASYNC 2 /* Data-related inode changes pending */ +#define I_DIRTY_PAGES 4 /* Data-related inode changes pending */ +#define __I_LOCK 3 +#define I_LOCK (1 << __I_LOCK) +#define I_FREEING 16 +#define I_CLEAR 32 +#define I_NEW 64 + +#define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES) + +extern void __mark_inode_dirty(struct inode *, int); +static inline void mark_inode_dirty(struct inode *inode) +{ + __mark_inode_dirty(inode, I_DIRTY); +} + +static inline void mark_inode_dirty_sync(struct inode *inode) +{ + __mark_inode_dirty(inode, I_DIRTY_SYNC); +} + +static inline void touch_atime(struct vfsmount *mnt, struct dentry *dentry) +{ + /* per-mountpoint checks will go here */ + update_atime(dentry->d_inode); +} + +static inline void file_accessed(struct file *file) +{ + if (!(file->f_flags & O_NOATIME)) + touch_atime(file->f_vfsmnt, file->f_dentry); +} + +int sync_inode(struct inode *inode, struct writeback_control *wbc); + +/** + * &export_operations - for nfsd to communicate with file systems + * decode_fh: decode a file handle fragment and return a &struct dentry + * encode_fh: encode a file handle fragment from a dentry + * get_name: find the name for a given inode in a given directory + * get_parent: find the parent of a given directory + * get_dentry: find a dentry for the inode given a file handle sub-fragment + * + * Description: + * The export_operations structure provides a means for nfsd to communicate + * with a particular exported file system - particularly enabling nfsd and + * the filesystem to co-operate when dealing with file handles. + * + * export_operations contains two basic operation for dealing with file handles, + * decode_fh() and encode_fh(), and allows for some other operations to be defined + * which standard helper routines use to get specific information from the + * filesystem. + * + * nfsd encodes information use to determine which filesystem a filehandle + * applies to in the initial part of the file handle. The remainder, termed a + * file handle fragment, is controlled completely by the filesystem. + * The standard helper routines assume that this fragment will contain one or two + * sub-fragments, one which identifies the file, and one which may be used to + * identify the (a) directory containing the file. + * + * In some situations, nfsd needs to get a dentry which is connected into a + * specific part of the file tree. To allow for this, it passes the function + * acceptable() together with a @context which can be used to see if the dentry + * is acceptable. As there can be multiple dentrys for a given file, the filesystem + * should check each one for acceptability before looking for the next. As soon + * as an acceptable one is found, it should be returned. + * + * decode_fh: + * @decode_fh is given a &struct super_block (@sb), a file handle fragment (@fh, @fh_len) + * and an acceptability testing function (@acceptable, @context). It should return + * a &struct dentry which refers to the same file that the file handle fragment refers + * to, and which passes the acceptability test. If it cannot, it should return + * a %NULL pointer if the file was found but no acceptable &dentries were available, or + * a %ERR_PTR error code indicating why it couldn't be found (e.g. %ENOENT or %ENOMEM). + * + * encode_fh: + * @encode_fh should store in the file handle fragment @fh (using at most @max_len bytes) + * information that can be used by @decode_fh to recover the file refered to by the + * &struct dentry @de. If the @connectable flag is set, the encode_fh() should store + * sufficient information so that a good attempt can be made to find not only + * the file but also it's place in the filesystem. This typically means storing + * a reference to de->d_parent in the filehandle fragment. + * encode_fh() should return the number of bytes stored or a negative error code + * such as %-ENOSPC + * + * get_name: + * @get_name should find a name for the given @child in the given @parent directory. + * The name should be stored in the @name (with the understanding that it is already + * pointing to a a %NAME_MAX+1 sized buffer. get_name() should return %0 on success, + * a negative error code or error. + * @get_name will be called without @parent->i_sem held. + * + * get_parent: + * @get_parent should find the parent directory for the given @child which is also + * a directory. In the event that it cannot be found, or storage space cannot be + * allocated, a %ERR_PTR should be returned. + * + * get_dentry: + * Given a &super_block (@sb) and a pointer to a file-system specific inode identifier, + * possibly an inode number, (@inump) get_dentry() should find the identified inode and + * return a dentry for that inode. + * Any suitable dentry can be returned including, if necessary, a new dentry created + * with d_alloc_root. The caller can then find any other extant dentrys by following the + * d_alias links. If a new dentry was created using d_alloc_root, DCACHE_NFSD_DISCONNECTED + * should be set, and the dentry should be d_rehash()ed. + * + * If the inode cannot be found, either a %NULL pointer or an %ERR_PTR code can be returned. + * The @inump will be whatever was passed to nfsd_find_fh_dentry() in either the + * @obj or @parent parameters. + * + * Locking rules: + * get_parent is called with child->d_inode->i_sem down + * get_name is not (which is possibly inconsistent) + */ + +struct export_operations { + struct dentry *(*decode_fh)(struct super_block *sb, __u32 *fh, int fh_len, int fh_type, + int (*acceptable)(void *context, struct dentry *de), + void *context); + int (*encode_fh)(struct dentry *de, __u32 *fh, int *max_len, + int connectable); + + /* the following are only called from the filesystem itself */ + int (*get_name)(struct dentry *parent, char *name, + struct dentry *child); + struct dentry * (*get_parent)(struct dentry *child); + struct dentry * (*get_dentry)(struct super_block *sb, void *inump); + + /* This is set by the exporting module to a standard helper */ + struct dentry * (*find_exported_dentry)( + struct super_block *sb, void *obj, void *parent, + int (*acceptable)(void *context, struct dentry *de), + void *context); + + +}; + +extern struct dentry * +find_exported_dentry(struct super_block *sb, void *obj, void *parent, + int (*acceptable)(void *context, struct dentry *de), + void *context); + +struct file_system_type { + const char *name; + int fs_flags; + struct super_block *(*get_sb) (struct file_system_type *, int, + const char *, void *); + void (*kill_sb) (struct super_block *); + struct module *owner; + struct file_system_type * next; + struct list_head fs_supers; +}; + +struct super_block *get_sb_bdev(struct file_system_type *fs_type, + int flags, const char *dev_name, void *data, + int (*fill_super)(struct super_block *, void *, int)); +struct super_block *get_sb_single(struct file_system_type *fs_type, + int flags, void *data, + int (*fill_super)(struct super_block *, void *, int)); +struct super_block *get_sb_nodev(struct file_system_type *fs_type, + int flags, void *data, + int (*fill_super)(struct super_block *, void *, int)); +void generic_shutdown_super(struct super_block *sb); +void kill_block_super(struct super_block *sb); +void kill_anon_super(struct super_block *sb); +void kill_litter_super(struct super_block *sb); +void deactivate_super(struct super_block *sb); +int set_anon_super(struct super_block *s, void *data); +struct super_block *sget(struct file_system_type *type, + int (*test)(struct super_block *,void *), + int (*set)(struct super_block *,void *), + void *data); +struct super_block *get_sb_pseudo(struct file_system_type *, char *, + struct super_operations *ops, unsigned long); +int __put_super(struct super_block *sb); +int __put_super_and_need_restart(struct super_block *sb); +void unnamed_dev_init(void); + +/* Alas, no aliases. Too much hassle with bringing module.h everywhere */ +#define fops_get(fops) \ + (((fops) && try_module_get((fops)->owner) ? (fops) : NULL)) +#define fops_put(fops) \ + do { if (fops) module_put((fops)->owner); } while(0) + +extern int register_filesystem(struct file_system_type *); +extern int unregister_filesystem(struct file_system_type *); +extern struct vfsmount *kern_mount(struct file_system_type *); +extern int may_umount_tree(struct vfsmount *); +extern int may_umount(struct vfsmount *); +extern long do_mount(char *, char *, char *, unsigned long, void *); + +extern int vfs_statfs(struct super_block *, struct kstatfs *); + +#define FLOCK_VERIFY_READ 1 +#define FLOCK_VERIFY_WRITE 2 + +extern int locks_mandatory_locked(struct inode *); +extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t); + +/* + * Candidates for mandatory locking have the setgid bit set + * but no group execute bit - an otherwise meaningless combination. + */ +#define MANDATORY_LOCK(inode) \ + (IS_MANDLOCK(inode) && ((inode)->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID) + +static inline int locks_verify_locked(struct inode *inode) +{ + if (MANDATORY_LOCK(inode)) + return locks_mandatory_locked(inode); + return 0; +} + +extern int rw_verify_area(int, struct file *, loff_t *, size_t); + +static inline int locks_verify_truncate(struct inode *inode, + struct file *filp, + loff_t size) +{ + if (inode->i_flock && MANDATORY_LOCK(inode)) + return locks_mandatory_area( + FLOCK_VERIFY_WRITE, inode, filp, + size < inode->i_size ? size : inode->i_size, + (size < inode->i_size ? inode->i_size - size + : size - inode->i_size) + ); + return 0; +} + +static inline int break_lease(struct inode *inode, unsigned int mode) +{ + if (inode->i_flock) + return __break_lease(inode, mode); + return 0; +} + +/* fs/open.c */ + +extern int do_truncate(struct dentry *, loff_t start); +extern struct file *filp_open(const char *, int, int); +extern struct file * dentry_open(struct dentry *, struct vfsmount *, int); +extern int filp_close(struct file *, fl_owner_t id); +extern char * getname(const char __user *); + +/* fs/dcache.c */ +extern void __init vfs_caches_init_early(void); +extern void __init vfs_caches_init(unsigned long); + +#define __getname() kmem_cache_alloc(names_cachep, SLAB_KERNEL) +#define __putname(name) kmem_cache_free(names_cachep, (void *)(name)) +#ifndef CONFIG_AUDITSYSCALL +#define putname(name) __putname(name) +#else +extern void putname(const char *name); +#endif + +extern int register_blkdev(unsigned int, const char *); +extern int unregister_blkdev(unsigned int, const char *); +extern struct block_device *bdget(dev_t); +extern void bd_set_size(struct block_device *, loff_t size); +extern void bd_forget(struct inode *inode); +extern void bdput(struct block_device *); +extern struct block_device *open_by_devnum(dev_t, unsigned); +extern struct file_operations def_blk_fops; +extern struct address_space_operations def_blk_aops; +extern struct file_operations def_chr_fops; +extern struct file_operations bad_sock_fops; +extern struct file_operations def_fifo_fops; +extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long); +extern int blkdev_ioctl(struct inode *, struct file *, unsigned, unsigned long); +extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long); +extern int blkdev_get(struct block_device *, mode_t, unsigned); +extern int blkdev_put(struct block_device *); +extern int bd_claim(struct block_device *, void *); +extern void bd_release(struct block_device *); + +/* fs/char_dev.c */ +extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *); +extern int register_chrdev_region(dev_t, unsigned, const char *); +extern int register_chrdev(unsigned int, const char *, + struct file_operations *); +extern int unregister_chrdev(unsigned int, const char *); +extern void unregister_chrdev_region(dev_t, unsigned); +extern int chrdev_open(struct inode *, struct file *); + +/* fs/block_dev.c */ +#define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ +extern const char *__bdevname(dev_t, char *buffer); +extern const char *bdevname(struct block_device *bdev, char *buffer); +extern struct block_device *lookup_bdev(const char *); +extern struct block_device *open_bdev_excl(const char *, int, void *); +extern void close_bdev_excl(struct block_device *); + +extern void init_special_inode(struct inode *, umode_t, dev_t); + +/* Invalid inode operations -- fs/bad_inode.c */ +extern void make_bad_inode(struct inode *); +extern int is_bad_inode(struct inode *); + +extern struct file_operations read_fifo_fops; +extern struct file_operations write_fifo_fops; +extern struct file_operations rdwr_fifo_fops; +extern struct file_operations read_pipe_fops; +extern struct file_operations write_pipe_fops; +extern struct file_operations rdwr_pipe_fops; + +extern int fs_may_remount_ro(struct super_block *); + +/* + * return READ, READA, or WRITE + */ +#define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK)) + +/* + * return data direction, READ or WRITE + */ +#define bio_data_dir(bio) ((bio)->bi_rw & 1) + +extern int check_disk_change(struct block_device *); +extern int invalidate_inodes(struct super_block *); +extern int __invalidate_device(struct block_device *, int); +extern int invalidate_partition(struct gendisk *, int); +unsigned long invalidate_mapping_pages(struct address_space *mapping, + pgoff_t start, pgoff_t end); +unsigned long invalidate_inode_pages(struct address_space *mapping); +static inline void invalidate_remote_inode(struct inode *inode) +{ + if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || + S_ISLNK(inode->i_mode)) + invalidate_inode_pages(inode->i_mapping); +} +extern int invalidate_inode_pages2(struct address_space *mapping); +extern int invalidate_inode_pages2_range(struct address_space *mapping, + pgoff_t start, pgoff_t end); +extern int write_inode_now(struct inode *, int); +extern int filemap_fdatawrite(struct address_space *); +extern int filemap_flush(struct address_space *); +extern int filemap_fdatawait(struct address_space *); +extern int filemap_write_and_wait(struct address_space *mapping); +extern int filemap_write_and_wait_range(struct address_space *mapping, + loff_t lstart, loff_t lend); +extern void sync_supers(void); +extern void sync_filesystems(int wait); +extern void emergency_sync(void); +extern void emergency_remount(void); +extern int do_remount_sb(struct super_block *sb, int flags, + void *data, int force); +extern sector_t bmap(struct inode *, sector_t); +extern int setattr_mask(unsigned int); +extern int notify_change(struct dentry *, struct iattr *); +extern int permission(struct inode *, int, struct nameidata *); +extern int generic_permission(struct inode *, int, + int (*check_acl)(struct inode *, int)); + +extern int get_write_access(struct inode *); +extern int deny_write_access(struct file *); +static inline void put_write_access(struct inode * inode) +{ + atomic_dec(&inode->i_writecount); +} +static inline void allow_write_access(struct file *file) +{ + if (file) + atomic_inc(&file->f_dentry->d_inode->i_writecount); +} +extern int do_pipe(int *); + +extern int open_namei(const char *, int, int, struct nameidata *); +extern int may_open(struct nameidata *, int, int); + +extern int kernel_read(struct file *, unsigned long, char *, unsigned long); +extern struct file * open_exec(const char *); + +/* fs/dcache.c -- generic fs support functions */ +extern int is_subdir(struct dentry *, struct dentry *); +extern ino_t find_inode_number(struct dentry *, struct qstr *); + +#include <linux/err.h> + +/* needed for stackable file system support */ +extern loff_t default_llseek(struct file *file, loff_t offset, int origin); + +extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin); + +extern void inode_init_once(struct inode *); +extern void iput(struct inode *); +extern struct inode * igrab(struct inode *); +extern ino_t iunique(struct super_block *, ino_t); +extern int inode_needs_sync(struct inode *inode); +extern void generic_delete_inode(struct inode *inode); + +extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval, + int (*test)(struct inode *, void *), void *data); +extern struct inode *ilookup(struct super_block *sb, unsigned long ino); + +extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *); +extern struct inode * iget_locked(struct super_block *, unsigned long); +extern void unlock_new_inode(struct inode *); + +static inline struct inode *iget(struct super_block *sb, unsigned long ino) +{ + struct inode *inode = iget_locked(sb, ino); + + if (inode && (inode->i_state & I_NEW)) { + sb->s_op->read_inode(inode); + unlock_new_inode(inode); + } + + return inode; +} + +extern void __iget(struct inode * inode); +extern void clear_inode(struct inode *); +extern void destroy_inode(struct inode *); +extern struct inode *new_inode(struct super_block *); +extern int remove_suid(struct dentry *); +extern void remove_dquot_ref(struct super_block *, int, struct list_head *); +extern struct semaphore iprune_sem; + +extern void __insert_inode_hash(struct inode *, unsigned long hashval); +extern void remove_inode_hash(struct inode *); +static inline void insert_inode_hash(struct inode *inode) { + __insert_inode_hash(inode, inode->i_ino); +} + +extern struct file * get_empty_filp(void); +extern void file_move(struct file *f, struct list_head *list); +extern void file_kill(struct file *f); +struct bio; +extern void submit_bio(int, struct bio *); +extern int bdev_read_only(struct block_device *); +extern int set_blocksize(struct block_device *, int); +extern int sb_set_blocksize(struct super_block *, int); +extern int sb_min_blocksize(struct super_block *, int); + +extern int generic_file_mmap(struct file *, struct vm_area_struct *); +extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *); +extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size); +extern int file_send_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size); +extern ssize_t generic_file_read(struct file *, char __user *, size_t, loff_t *); +int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk); +extern ssize_t generic_file_write(struct file *, const char __user *, size_t, loff_t *); +extern ssize_t generic_file_aio_read(struct kiocb *, char __user *, size_t, loff_t); +extern ssize_t __generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t *); +extern ssize_t generic_file_aio_write(struct kiocb *, const char __user *, size_t, loff_t); +extern ssize_t generic_file_aio_write_nolock(struct kiocb *, const struct iovec *, + unsigned long, loff_t *); +extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *, + unsigned long *, loff_t, loff_t *, size_t, size_t); +extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *, + unsigned long, loff_t, loff_t *, size_t, ssize_t); +extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos); +extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos); +ssize_t generic_file_write_nolock(struct file *file, const struct iovec *iov, + unsigned long nr_segs, loff_t *ppos); +extern ssize_t generic_file_sendfile(struct file *, loff_t *, size_t, read_actor_t, void *); +extern void do_generic_mapping_read(struct address_space *mapping, + struct file_ra_state *, struct file *, + loff_t *, read_descriptor_t *, read_actor_t); +extern void +file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping); +extern ssize_t generic_file_direct_IO(int rw, struct kiocb *iocb, + const struct iovec *iov, loff_t offset, unsigned long nr_segs); +extern ssize_t generic_file_readv(struct file *filp, const struct iovec *iov, + unsigned long nr_segs, loff_t *ppos); +ssize_t generic_file_writev(struct file *filp, const struct iovec *iov, + unsigned long nr_segs, loff_t *ppos); +extern loff_t no_llseek(struct file *file, loff_t offset, int origin); +extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin); +extern loff_t remote_llseek(struct file *file, loff_t offset, int origin); +extern int generic_file_open(struct inode * inode, struct file * filp); +extern int nonseekable_open(struct inode * inode, struct file * filp); + +static inline void do_generic_file_read(struct file * filp, loff_t *ppos, + read_descriptor_t * desc, + read_actor_t actor) +{ + do_generic_mapping_read(filp->f_mapping, + &filp->f_ra, + filp, + ppos, + desc, + actor); +} + +ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, + struct block_device *bdev, const struct iovec *iov, loff_t offset, + unsigned long nr_segs, get_blocks_t get_blocks, dio_iodone_t end_io, + int lock_type); + +enum { + DIO_LOCKING = 1, /* need locking between buffered and direct access */ + DIO_NO_LOCKING, /* bdev; no locking at all between buffered/direct */ + DIO_OWN_LOCKING, /* filesystem locks buffered and direct internally */ +}; + +static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb, + struct inode *inode, struct block_device *bdev, const struct iovec *iov, + loff_t offset, unsigned long nr_segs, get_blocks_t get_blocks, + dio_iodone_t end_io) +{ + return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, + nr_segs, get_blocks, end_io, DIO_LOCKING); +} + +static inline ssize_t blockdev_direct_IO_no_locking(int rw, struct kiocb *iocb, + struct inode *inode, struct block_device *bdev, const struct iovec *iov, + loff_t offset, unsigned long nr_segs, get_blocks_t get_blocks, + dio_iodone_t end_io) +{ + return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, + nr_segs, get_blocks, end_io, DIO_NO_LOCKING); +} + +static inline ssize_t blockdev_direct_IO_own_locking(int rw, struct kiocb *iocb, + struct inode *inode, struct block_device *bdev, const struct iovec *iov, + loff_t offset, unsigned long nr_segs, get_blocks_t get_blocks, + dio_iodone_t end_io) +{ + return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, + nr_segs, get_blocks, end_io, DIO_OWN_LOCKING); +} + +extern struct file_operations generic_ro_fops; + +#define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m)) + +extern int vfs_readlink(struct dentry *, char __user *, int, const char *); +extern int vfs_follow_link(struct nameidata *, const char *); +extern int page_readlink(struct dentry *, char __user *, int); +extern int page_follow_link_light(struct dentry *, struct nameidata *); +extern void page_put_link(struct dentry *, struct nameidata *); +extern int page_symlink(struct inode *inode, const char *symname, int len); +extern struct inode_operations page_symlink_inode_operations; +extern int generic_readlink(struct dentry *, char __user *, int); +extern void generic_fillattr(struct inode *, struct kstat *); +extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *); +void inode_add_bytes(struct inode *inode, loff_t bytes); +void inode_sub_bytes(struct inode *inode, loff_t bytes); +loff_t inode_get_bytes(struct inode *inode); +void inode_set_bytes(struct inode *inode, loff_t bytes); + +extern int vfs_readdir(struct file *, filldir_t, void *); + +extern int vfs_stat(char __user *, struct kstat *); +extern int vfs_lstat(char __user *, struct kstat *); +extern int vfs_fstat(unsigned int, struct kstat *); + +extern int vfs_ioctl(struct file *, unsigned int, unsigned int, unsigned long); + +extern struct file_system_type *get_fs_type(const char *name); +extern struct super_block *get_super(struct block_device *); +extern struct super_block *user_get_super(dev_t); +extern void drop_super(struct super_block *sb); + +extern int dcache_dir_open(struct inode *, struct file *); +extern int dcache_dir_close(struct inode *, struct file *); +extern loff_t dcache_dir_lseek(struct file *, loff_t, int); +extern int dcache_readdir(struct file *, void *, filldir_t); +extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *); +extern int simple_statfs(struct super_block *, struct kstatfs *); +extern int simple_link(struct dentry *, struct inode *, struct dentry *); +extern int simple_unlink(struct inode *, struct dentry *); +extern int simple_rmdir(struct inode *, struct dentry *); +extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); +extern int simple_sync_file(struct file *, struct dentry *, int); +extern int simple_empty(struct dentry *); +extern int simple_readpage(struct file *file, struct page *page); +extern int simple_prepare_write(struct file *file, struct page *page, + unsigned offset, unsigned to); +extern int simple_commit_write(struct file *file, struct page *page, + unsigned offset, unsigned to); + +extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *); +extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *); +extern struct file_operations simple_dir_operations; +extern struct inode_operations simple_dir_inode_operations; +struct tree_descr { char *name; struct file_operations *ops; int mode; }; +struct dentry *d_alloc_name(struct dentry *, const char *); +extern int simple_fill_super(struct super_block *, int, struct tree_descr *); +extern int simple_pin_fs(char *name, struct vfsmount **mount, int *count); +extern void simple_release_fs(struct vfsmount **mount, int *count); + +extern ssize_t simple_read_from_buffer(void __user *, size_t, loff_t *, const void *, size_t); + +extern int inode_change_ok(struct inode *, struct iattr *); +extern int __must_check inode_setattr(struct inode *, struct iattr *); + +extern void inode_update_time(struct inode *inode, int ctime_too); + +static inline ino_t parent_ino(struct dentry *dentry) +{ + ino_t res; + + spin_lock(&dentry->d_lock); + res = dentry->d_parent->d_inode->i_ino; + spin_unlock(&dentry->d_lock); + return res; +} + +/* kernel/fork.c */ +extern int unshare_files(void); + +/* Transaction based IO helpers */ + +/* + * An argresp is stored in an allocated page and holds the + * size of the argument or response, along with its content + */ +struct simple_transaction_argresp { + ssize_t size; + char data[0]; +}; + +#define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp)) + +char *simple_transaction_get(struct file *file, const char __user *buf, + size_t size); +ssize_t simple_transaction_read(struct file *file, char __user *buf, + size_t size, loff_t *pos); +int simple_transaction_release(struct inode *inode, struct file *file); + +static inline void simple_transaction_set(struct file *file, size_t n) +{ + struct simple_transaction_argresp *ar = file->private_data; + + BUG_ON(n > SIMPLE_TRANSACTION_LIMIT); + + /* + * The barrier ensures that ar->size will really remain zero until + * ar->data is ready for reading. + */ + smp_mb(); + ar->size = n; +} + +#ifdef CONFIG_SECURITY +static inline char *alloc_secdata(void) +{ + return (char *)get_zeroed_page(GFP_KERNEL); +} + +static inline void free_secdata(void *secdata) +{ + free_page((unsigned long)secdata); +} +#else +static inline char *alloc_secdata(void) +{ + return (char *)1; +} + +static inline void free_secdata(void *secdata) +{ } +#endif /* CONFIG_SECURITY */ + +#endif /* __KERNEL__ */ +#endif /* _LINUX_FS_H */ |
