#ifndef _LINUX_FS_H #define _LINUX_FS_H /* * This file has definitions for some important file table * structures etc. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include struct poll_table_struct; /* * 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<kern_mnt. */ #define FS_NOMOUNT 16 /* Never mount from userland */ /* * These are the fs-independent mount-flags: up to 16 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 S_QUOTA 128 /* Quota initialized for file/directory/symlink */ #define S_APPEND 256 /* Append-only file */ #define S_IMMUTABLE 512 /* Immutable file */ #define MS_NOATIME 1024 /* Do not update access times. */ #define MS_NODIRATIME 2048 /* Do not update directory access times */ #define MS_ODD_RENAME 32768 /* Temporary stuff; will go away as soon * as nfs_rename() will be cleaned up */ #define S_DEAD (1<<16) /* removed, but still open directory */ /* * Flags that can be altered by MS_REMOUNT */ #define MS_RMT_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|\ MS_SYNCHRONOUS|MS_MANDLOCK|MS_NOATIME|MS_NODIRATIME) /* * Magic mount flag number. Has to be or-ed to the flag values. */ #define MS_MGC_VAL 0xC0ED0000 /* magic flag number to indicate "new" flags */ #define MS_MGC_MSK 0xffff0000 /* magic flag number mask */ /* * 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 && (inode)->i_sb->s_flags & (flg)) \ || (inode)->i_flags & (flg)) #define IS_RDONLY(inode) (((inode)->i_sb) && ((inode)->i_sb->s_flags & MS_RDONLY)) #define IS_NOSUID(inode) __IS_FLG(inode, MS_NOSUID) #define IS_NODEV(inode) __IS_FLG(inode, MS_NODEV) #define IS_NOEXEC(inode) __IS_FLG(inode, MS_NOEXEC) #define IS_SYNC(inode) __IS_FLG(inode, MS_SYNCHRONOUS) #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK) #define IS_QUOTAINIT(inode) ((inode)->i_flags & S_QUOTA) #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) #define IS_NODIRATIME(inode) __IS_FLG(inode, MS_NODIRATIME) #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD) /* 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 */ #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 */ #define BLKELVGET _IO(0x12,106)/* elevator get */ #define BLKELVSET _IO(0x12,107)/* 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 #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 #include extern void update_atime (struct inode *); #define UPDATE_ATIME(inode) update_atime (inode) extern void buffer_init(unsigned long); extern void inode_init(unsigned long); extern void file_table_init(void); extern void dcache_init(unsigned long); /* bh state bits */ #define BH_Uptodate 0 /* 1 if the buffer contains valid data */ #define BH_Dirty 1 /* 1 if the buffer is dirty */ #define BH_Lock 2 /* 1 if the buffer is locked */ #define BH_Req 3 /* 0 if the buffer has been invalidated */ #define BH_Mapped 4 /* 1 if the buffer has a disk mapping */ #define BH_New 5 /* 1 if the buffer is new and not yet written out */ #define BH_Protected 6 /* 1 if the buffer is protected */ /* * Try to keep the most commonly used fields in single cache lines (16 * bytes) to improve performance. This ordering should be * particularly beneficial on 32-bit processors. * * We use the first 16 bytes for the data which is used in searches * over the block hash lists (ie. getblk() and friends). * * The second 16 bytes we use for lru buffer scans, as used by * sync_buffers() and refill_freelist(). -- sct */ struct buffer_head { /* First cache line: */ struct buffer_head *b_next; /* Hash queue list */ unsigned long b_blocknr; /* block number */ unsigned short b_size; /* block size */ unsigned short b_list; /* List that this buffer appears */ kdev_t b_dev; /* device (B_FREE = free) */ atomic_t b_count; /* users using this block */ kdev_t b_rdev; /* Real device */ unsigned long b_state; /* buffer state bitmap (see above) */ unsigned long b_flushtime; /* Time when (dirty) buffer should be written */ struct buffer_head *b_next_free;/* lru/free list linkage */ struct buffer_head *b_prev_free;/* doubly linked list of buffers */ struct buffer_head *b_this_page;/* circular list of buffers in one page */ struct buffer_head *b_reqnext; /* request queue */ struct buffer_head **b_pprev; /* doubly linked list of hash-queue */ char * b_data; /* pointer to data block (512 byte) */ struct page *b_page; /* the page this bh is mapped to */ void (*b_end_io)(struct buffer_head *bh, int uptodate); /* I/O completion */ void *b_dev_id; unsigned long b_rsector; /* Real buffer location on disk */ wait_queue_head_t b_wait; struct kiobuf * b_kiobuf; /* kiobuf which owns this IO */ }; typedef void (bh_end_io_t)(struct buffer_head *bh, int uptodate); void init_buffer(struct buffer_head *, bh_end_io_t *, void *); #define __buffer_state(bh, state) (((bh)->b_state & (1UL << BH_##state)) != 0) #define buffer_uptodate(bh) __buffer_state(bh,Uptodate) #define buffer_dirty(bh) __buffer_state(bh,Dirty) #define buffer_locked(bh) __buffer_state(bh,Lock) #define buffer_req(bh) __buffer_state(bh,Req) #define buffer_mapped(bh) __buffer_state(bh,Mapped) #define buffer_new(bh) __buffer_state(bh,New) #define buffer_protected(bh) __buffer_state(bh,Protected) #define bh_offset(bh) ((unsigned long)(bh)->b_data & ~PAGE_MASK) extern void set_bh_page(struct buffer_head *bh, struct page *page, unsigned long offset); #define touch_buffer(bh) SetPageReferenced(bh->b_page) #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* * 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 /* * 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 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; time_t ia_atime; time_t ia_mtime; time_t 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 and mount structures. */ #include #include /* * oh the beauties of C type declarations. */ struct page; struct address_space; struct address_space_operations { int (*writepage)(struct file *, struct page *); int (*readpage)(struct file *, struct page *); int (*sync_page)(struct page *); 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 */ int (*bmap)(struct address_space *, long); }; struct address_space { struct list_head pages; /* list of pages */ unsigned long nrpages; /* number of pages */ struct address_space_operations *a_ops; /* methods */ void *host; /* owner: inode, block_device */ struct vm_area_struct *i_mmap; /* list of mappings */ spinlock_t i_shared_lock; /* and spinlock protecting it */ }; struct block_device { struct list_head bd_hash; atomic_t bd_count; /* struct address_space bd_data; */ dev_t bd_dev; /* not a kdev_t - it's a search key */ atomic_t bd_openers; const struct block_device_operations *bd_op; struct semaphore bd_sem; /* open/close mutex */ }; struct inode { struct list_head i_hash; struct list_head i_list; struct list_head i_dentry; unsigned long i_ino; unsigned int i_count; kdev_t i_dev; umode_t i_mode; nlink_t i_nlink; uid_t i_uid; gid_t i_gid; kdev_t i_rdev; loff_t i_size; time_t i_atime; time_t i_mtime; time_t i_ctime; unsigned long i_blksize; unsigned long i_blocks; unsigned long i_version; struct semaphore i_sem; struct semaphore i_zombie; struct inode_operations *i_op; struct file_operations *i_fop; /* former ->i_op->default_file_ops */ struct super_block *i_sb; wait_queue_head_t i_wait; struct file_lock *i_flock; struct address_space *i_mapping; struct address_space i_data; struct dquot *i_dquot[MAXQUOTAS]; struct pipe_inode_info *i_pipe; struct block_device *i_bdev; unsigned long i_state; unsigned int i_flags; unsigned char i_sock; atomic_t i_writecount; unsigned int i_attr_flags; __u32 i_generation; union { struct minix_inode_info minix_i; struct ext2_inode_info ext2_i; struct hpfs_inode_info hpfs_i; struct ntfs_inode_info ntfs_i; struct msdos_inode_info msdos_i; struct umsdos_inode_info umsdos_i; struct iso_inode_info isofs_i; struct nfs_inode_info nfs_i; struct sysv_inode_info sysv_i; struct affs_inode_info affs_i; struct ufs_inode_info ufs_i; struct efs_inode_info efs_i; struct romfs_inode_info romfs_i; struct coda_inode_info coda_i; struct smb_inode_info smbfs_i; struct hfs_inode_info hfs_i; struct adfs_inode_info adfs_i; struct qnx4_inode_info qnx4_i; struct bfs_inode_info bfs_i; struct udf_inode_info udf_i; struct ncp_inode_info ncpfs_i; struct proc_inode_info proc_i; struct socket socket_i; struct usbdev_inode_info usbdev_i; void *generic_ip; } u; }; /* Inode state bits.. */ #define I_DIRTY 1 #define I_LOCK 2 #define I_FREEING 4 #define I_CLEAR 8 extern void __mark_inode_dirty(struct inode *); static inline void mark_inode_dirty(struct inode *inode) { if (!(inode->i_state & I_DIRTY)) __mark_inode_dirty(inode); } struct fown_struct { int pid; /* pid or -pgrp where SIGIO should be sent */ uid_t uid, euid; /* uid/euid of process setting the owner */ int signum; /* posix.1b rt signal to be delivered on IO */ }; 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; loff_t f_pos; unsigned long f_reada, f_ramax, f_raend, f_ralen, f_rawin; struct fown_struct f_owner; unsigned int f_uid, f_gid; int f_error; unsigned long f_version; /* needed for tty driver, and maybe others */ void *private_data; }; 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) extern int init_private_file(struct file *, struct dentry *, int); #define FL_POSIX 1 #define FL_FLOCK 2 #define FL_BROKEN 4 /* broken flock() emulation */ #define FL_ACCESS 8 /* for processes suspended by mandatory locking */ #define FL_LOCKD 16 /* lock held by rpc.lockd */ /* * 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 { struct file_lock *fl_next; /* singly linked list for this inode */ struct file_lock *fl_nextlink; /* doubly linked list of all locks */ struct file_lock *fl_prevlink; /* used to simplify lock removal */ struct file_lock *fl_nextblock; /* circular list of blocked processes */ struct file_lock *fl_prevblock; 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; void (*fl_notify)(struct file_lock *); /* unblock callback */ void (*fl_insert)(struct file_lock *); /* lock insertion callback */ void (*fl_remove)(struct file_lock *); /* lock removal callback */ 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) #endif extern struct file_lock *file_lock_table; #include extern int fcntl_getlk(unsigned int, struct flock *); extern int fcntl_setlk(unsigned int, unsigned int, struct flock *); /* fs/locks.c */ 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 *, unsigned int); extern void posix_block_lock(struct file_lock *, struct file_lock *); extern void posix_unblock_lock(struct file_lock *); struct fasync_struct { int magic; int fa_fd; struct fasync_struct *fa_next; /* singly linked list */ struct file *fa_file; }; struct nameidata { struct dentry *dentry; struct vfsmount *mnt; struct qstr last; unsigned int flags; int last_type; }; #define FASYNC_MAGIC 0x4601 extern int fasync_helper(int, struct file *, int, struct fasync_struct **); #define DQUOT_USR_ENABLED 0x01 /* User diskquotas enabled */ #define DQUOT_GRP_ENABLED 0x02 /* Group diskquotas enabled */ struct quota_mount_options { unsigned int flags; /* Flags for diskquotas on this device */ struct semaphore dqio_sem; /* lock device while I/O in progress */ struct semaphore dqoff_sem; /* serialize quota_off() and quota_on() on device */ struct file *files[MAXQUOTAS]; /* fp's to quotafiles */ time_t inode_expire[MAXQUOTAS]; /* expiretime for inode-quota */ time_t block_expire[MAXQUOTAS]; /* expiretime for block-quota */ char rsquash[MAXQUOTAS]; /* for quotas threat root as any other user */ }; /* * Umount options */ #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include extern struct list_head super_blocks; #define sb_entry(list) list_entry((list), struct super_block, s_list) struct super_block { struct list_head s_list; /* Keep this first */ kdev_t s_dev; unsigned long s_blocksize; unsigned char s_blocksize_bits; unsigned char s_lock; unsigned char s_dirt; struct file_system_type *s_type; struct super_operations *s_op; struct dquot_operations *dq_op; unsigned long s_flags; unsigned long s_magic; struct dentry *s_root; wait_queue_head_t s_wait; struct list_head s_dirty; /* dirty inodes */ struct list_head s_files; struct block_device *s_bdev; struct list_head s_mounts; /* vfsmount(s) of this one */ struct quota_mount_options s_dquot; /* Diskquota specific options */ union { struct minix_sb_info minix_sb; struct ext2_sb_info ext2_sb; struct hpfs_sb_info hpfs_sb; struct ntfs_sb_info ntfs_sb; struct msdos_sb_info msdos_sb; struct isofs_sb_info isofs_sb; struct nfs_sb_info nfs_sb; struct sysv_sb_info sysv_sb; struct affs_sb_info affs_sb; struct ufs_sb_info ufs_sb; struct efs_sb_info efs_sb; struct romfs_sb_info romfs_sb; struct smb_sb_info smbfs_sb; struct hfs_sb_info hfs_sb; struct adfs_sb_info adfs_sb; struct qnx4_sb_info qnx4_sb; struct bfs_sb_info bfs_sb; struct udf_sb_info udf_sb; struct ncp_sb_info ncpfs_sb; struct usbdev_sb_info usbdevfs_sb; void *generic_sbp; } u; /* * 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 */ /* The next field is used by knfsd when converting a (inode number based) * file handle into a dentry. As it builds a path in the dcache tree from * the bottom up, there may for a time be a subpath of dentrys which is not * connected to the main tree. This semaphore ensure that there is only ever * one such free path per filesystem. Note that unconnected files (or other * non-directories) are allowed, but not unconnected diretories. */ struct semaphore s_nfsd_free_path_sem; }; /* * VFS helper functions.. */ extern int vfs_create(struct inode *, struct dentry *, int); 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 *); 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 *); /* * 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, off_t, ino_t); 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); int (*check_media_change) (kdev_t); int (*revalidate) (kdev_t); }; /* * NOTE: * read, write, poll, fsync, readv, writev can be called * without the big kernel lock held in all filesystems. */ struct file_operations { loff_t (*llseek) (struct file *, loff_t, int); ssize_t (*read) (struct file *, char *, size_t, loff_t *); ssize_t (*write) (struct file *, const char *, 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); 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 (*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 *); }; struct inode_operations { int (*create) (struct inode *,struct dentry *,int); struct dentry * (*lookup) (struct inode *,struct dentry *); 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,int); int (*rename) (struct inode *, struct dentry *, struct inode *, struct dentry *); int (*readlink) (struct dentry *, char *,int); int (*follow_link) (struct dentry *, struct nameidata *); void (*truncate) (struct inode *); int (*permission) (struct inode *, int); int (*revalidate) (struct dentry *); int (*setattr) (struct dentry *, struct iattr *); int (*getattr) (struct dentry *, struct iattr *); }; /* * NOTE: write_inode, delete_inode, clear_inode, put_inode can be called * without the big kernel lock held in all filesystems. */ struct super_operations { void (*read_inode) (struct inode *); void (*write_inode) (struct inode *); void (*put_inode) (struct inode *); void (*delete_inode) (struct inode *); void (*put_super) (struct super_block *); void (*write_super) (struct super_block *); int (*statfs) (struct super_block *, struct statfs *); int (*remount_fs) (struct super_block *, int *, char *); void (*clear_inode) (struct inode *); void (*umount_begin) (struct super_block *); }; struct dquot_operations { void (*initialize) (struct inode *, short); void (*drop) (struct inode *); int (*alloc_block) (const struct inode *, unsigned long, char); int (*alloc_inode) (const struct inode *, unsigned long); void (*free_block) (const struct inode *, unsigned long); void (*free_inode) (const struct inode *, unsigned long); int (*transfer) (struct dentry *, struct iattr *); }; struct file_system_type { const char *name; int fs_flags; struct super_block *(*read_super) (struct super_block *, void *, int); struct module *owner; struct vfsmount *kern_mnt; /* For kernel mount, if it's FS_SINGLE fs */ struct file_system_type * next; }; #define DECLARE_FSTYPE(var,type,read,flags) \ struct file_system_type var = { \ name: type, \ read_super: read, \ fs_flags: flags, \ owner: THIS_MODULE, \ } #define DECLARE_FSTYPE_DEV(var,type,read) \ DECLARE_FSTYPE(var,type,read,FS_REQUIRES_DEV) 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 void kern_umount(struct vfsmount *); extern int may_umount(struct vfsmount *); extern int vfs_statfs(struct super_block *, struct statfs *); /* Return value for VFS lock functions - tells locks.c to lock conventionally * REALLY kosha for root NFS and nfs_lock */ #define LOCK_USE_CLNT 1 #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; } static inline int locks_verify_area(int read_write, struct inode *inode, struct file *filp, loff_t offset, size_t count) { if (inode->i_flock && MANDATORY_LOCK(inode)) return locks_mandatory_area(read_write, inode, filp, offset, count); return 0; } 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, abs(inode->i_size - size) ); return 0; } /* fs/open.c */ asmlinkage long sys_open(const char *, int, int); asmlinkage long sys_close(unsigned int); /* yes, it's really unsigned */ extern int do_close(unsigned int, int); /* yes, it's really unsigned */ extern int do_truncate(struct dentry *, loff_t start); extern int get_unused_fd(void); extern void __put_unused_fd(struct files_struct *, unsigned int); /* locked outside */ extern void put_unused_fd(unsigned int); /* locked inside */ 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 *); #define __getname() ((char *) __get_free_page(GFP_KERNEL)) #define putname(name) free_page((unsigned long)(name)) enum {BDEV_FILE, BDEV_SWAP, BDEV_FS, BDEV_RAW}; extern void kill_fasync(struct fasync_struct *, int, int); extern int register_blkdev(unsigned int, const char *, struct block_device_operations *); extern int unregister_blkdev(unsigned int, const char *); extern struct block_device *bdget(dev_t); extern void bdput(struct block_device *); extern int blkdev_open(struct inode *, struct file *); extern int blkdev_close(struct inode * inode, struct file * filp); extern struct file_operations def_blk_fops; extern struct file_operations def_fifo_fops; extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long); extern int blkdev_get(struct block_device *, mode_t, unsigned, int); extern int blkdev_put(struct block_device *, int); /* fs/devices.c */ extern const struct block_device_operations *get_blkfops(unsigned int); extern struct file_operations *get_chrfops(unsigned int, unsigned int); extern int register_chrdev(unsigned int, const char *, struct file_operations *); extern int unregister_chrdev(unsigned int, const char *); extern int chrdev_open(struct inode *, struct file *); extern const char * bdevname(kdev_t); extern const char * cdevname(kdev_t); extern const char * kdevname(kdev_t); extern void init_special_inode(struct inode *, umode_t, int); /* 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 *); extern int try_to_free_buffers(struct page *); extern void refile_buffer(struct buffer_head * buf); #define BUF_CLEAN 0 #define BUF_LOCKED 1 /* Buffers scheduled for write */ #define BUF_DIRTY 2 /* Dirty buffers, not yet scheduled for write */ #define BUF_PROTECTED 3 /* Ramdisk persistent storage */ #define NR_LIST 4 /* * This is called by bh->b_end_io() handlers when I/O has completed. */ static inline void mark_buffer_uptodate(struct buffer_head * bh, int on) { if (on) set_bit(BH_Uptodate, &bh->b_state); else clear_bit(BH_Uptodate, &bh->b_state); } #define atomic_set_buffer_clean(bh) test_and_clear_bit(BH_Dirty, &(bh)->b_state) static inline void __mark_buffer_clean(struct buffer_head *bh) { refile_buffer(bh); } static inline void mark_buffer_clean(struct buffer_head * bh) { if (atomic_set_buffer_clean(bh)) __mark_buffer_clean(bh); } #define atomic_set_buffer_protected(bh) test_and_set_bit(BH_Protected, &(bh)->b_state) static inline void __mark_buffer_protected(struct buffer_head *bh) { refile_buffer(bh); } static inline void mark_buffer_protected(struct buffer_head * bh) { if (!atomic_set_buffer_protected(bh)) __mark_buffer_protected(bh); } extern void FASTCALL(__mark_buffer_dirty(struct buffer_head *bh, int flag)); extern void FASTCALL(mark_buffer_dirty(struct buffer_head *bh, int flag)); #define atomic_set_buffer_dirty(bh) test_and_set_bit(BH_Dirty, &(bh)->b_state) extern void balance_dirty(kdev_t); extern int check_disk_change(kdev_t); extern int invalidate_inodes(struct super_block *); extern void invalidate_inode_pages(struct inode *); #define invalidate_buffers(dev) __invalidate_buffers((dev), 0) #define destroy_buffers(dev) __invalidate_buffers((dev), 1) extern void __invalidate_buffers(kdev_t dev, int); extern void sync_inodes(kdev_t); extern void write_inode_now(struct inode *); extern void sync_dev(kdev_t); extern int fsync_dev(kdev_t); extern void sync_supers(kdev_t); extern int bmap(struct inode *, int); extern int notify_change(struct dentry *, struct iattr *); extern int permission(struct inode *, int); extern int get_write_access(struct inode *); extern void put_write_access(struct inode *); extern int do_pipe(int *); extern int open_namei(const char *, int, int, struct nameidata *); 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 *); /* * Kernel pointers have redundant information, so we can use a * scheme where we can return either an error code or a dentry * pointer with the same return value. * * This should be a per-architecture thing, to allow different * error and pointer decisions. */ #define ERR_PTR(err) ((void *)((long)(err))) #define PTR_ERR(ptr) ((long)(ptr)) #define IS_ERR(ptr) ((unsigned long)(ptr) > (unsigned long)(-1000)) /* * The bitmask for a lookup event: * - follow links at the end * - require a directory * - ending slashes ok even for nonexistent files * - internal "there are more path compnents" flag */ #define LOOKUP_FOLLOW (1) #define LOOKUP_DIRECTORY (2) #define LOOKUP_CONTINUE (4) #define LOOKUP_POSITIVE (8) #define LOOKUP_PARENT (16) #define LOOKUP_NOALT (32) /* * Type of the last component on LOOKUP_PARENT */ enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT }; /* * "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; char * buf; int error; } read_descriptor_t; typedef int (*read_actor_t)(read_descriptor_t *, struct page *, unsigned long, unsigned long); /* needed for stackable file system support */ extern loff_t default_llseek(struct file *file, loff_t offset, int origin); extern int __user_walk(const char *, unsigned, struct nameidata *); extern int path_init(const char *, unsigned, struct nameidata *); extern int path_walk(const char *, struct nameidata *); extern void path_release(struct nameidata *); extern int follow_down(struct vfsmount **, struct dentry **); extern int follow_up(struct vfsmount **, struct dentry **); extern struct dentry * lookup_one(const char *, struct dentry *); extern struct dentry * lookup_hash(struct qstr *, struct dentry *); #define user_path_walk(name,nd) __user_walk(name, LOOKUP_FOLLOW|LOOKUP_POSITIVE, nd) #define user_path_walk_link(name,nd) __user_walk(name, LOOKUP_POSITIVE, nd) extern void iput(struct inode *); extern struct inode * igrab(struct inode *); extern ino_t iunique(struct super_block *, ino_t); typedef int (*find_inode_t)(struct inode *, unsigned long, void *); extern struct inode * iget4(struct super_block *, unsigned long, find_inode_t, void *); static inline struct inode *iget(struct super_block *sb, unsigned long ino) { return iget4(sb, ino, NULL, NULL); } extern void clear_inode(struct inode *); extern struct inode * get_empty_inode(void); extern void insert_inode_hash(struct inode *); extern void remove_inode_hash(struct inode *); extern struct file * get_empty_filp(void); extern void file_move(struct file *f, struct list_head *list); extern void file_moveto(struct file *new, struct file *old); extern struct buffer_head * get_hash_table(kdev_t, int, int); extern struct buffer_head * getblk(kdev_t, int, int); extern void ll_rw_block(int, int, struct buffer_head * bh[]); extern int is_read_only(kdev_t); extern void __brelse(struct buffer_head *); static inline void brelse(struct buffer_head *buf) { if (buf) __brelse(buf); } extern void __bforget(struct buffer_head *); static inline void bforget(struct buffer_head *buf) { if (buf) __bforget(buf); } extern void set_blocksize(kdev_t, int); extern unsigned int get_hardblocksize(kdev_t); extern struct buffer_head * bread(kdev_t, int, int); extern struct buffer_head * breada(kdev_t, int, int, unsigned int, unsigned int); extern void wakeup_bdflush(int wait); extern int brw_page(int, struct page *, kdev_t, int [], int); typedef int (get_block_t)(struct inode*,long,struct buffer_head*,int); /* Generic buffer handling for block filesystems.. */ extern int block_flushpage(struct page *, unsigned long); extern int block_fsync(struct file *filp, struct dentry *dentry); extern int block_symlink(struct inode *, const char *, int); extern int block_write_full_page(struct page*, get_block_t*); extern int block_read_full_page(struct page*, get_block_t*); extern int block_prepare_write(struct page*, unsigned, unsigned, get_block_t*); extern int cont_prepare_write(struct page*, unsigned, unsigned, get_block_t*, unsigned long *); extern int block_sync_page(struct page *); int generic_block_bmap(struct address_space *, long, get_block_t *); int generic_commit_write(struct file *, struct page *, unsigned, unsigned); extern int generic_file_mmap(struct file *, struct vm_area_struct *); extern ssize_t generic_file_read(struct file *, char *, size_t, loff_t *); extern ssize_t generic_file_write(struct file *, const char *, size_t, loff_t *); extern void do_generic_file_read(struct file *, loff_t *, read_descriptor_t *, read_actor_t); extern ssize_t generic_read_dir(struct file *, char *, size_t, loff_t *); extern struct file_operations generic_ro_fops; extern int vfs_readlink(struct dentry *, char *, int, const char *); extern int vfs_follow_link(struct nameidata *, const char *); extern int page_readlink(struct dentry *, char *, int); extern int page_follow_link(struct dentry *, struct nameidata *); extern struct inode_operations page_symlink_inode_operations; extern int vfs_readdir(struct file *, filldir_t, void *); extern struct super_block *get_super(kdev_t); struct super_block *get_empty_super(void); extern void put_super(kdev_t); unsigned long generate_cluster(kdev_t, int b[], int); unsigned long generate_cluster_swab32(kdev_t, int b[], int); extern kdev_t ROOT_DEV; extern char root_device_name[]; extern void show_buffers(void); extern void mount_root(void); #ifdef CONFIG_BLK_DEV_INITRD extern kdev_t real_root_dev; extern int change_root(kdev_t, const char *); #endif extern ssize_t char_read(struct file *, char *, size_t, loff_t *); extern ssize_t block_read(struct file *, char *, size_t, loff_t *); extern int read_ahead[]; extern ssize_t char_write(struct file *, const char *, size_t, loff_t *); extern ssize_t block_write(struct file *, const char *, size_t, loff_t *); extern int file_fsync(struct file *, struct dentry *); extern int generic_buffer_fdatasync(struct inode *inode, unsigned long start_idx, unsigned long end_idx); extern int inode_change_ok(struct inode *, struct iattr *); extern void inode_setattr(struct inode *, struct iattr *); /* * Common dentry functions for inclusion in the VFS * or in other stackable file systems. Some of these * functions were in linux/fs/ C (VFS) files. * */ /* * We need to do a check-parent every time * after we have locked the parent - to verify * that the parent is still our parent and * that we are still hashed onto it.. * * This is required in case two processes race * on removing (or moving) the same entry: the * parent lock will serialize them, but the * other process will be too late.. */ #define check_parent(dir, dentry) \ ((dir) == (dentry)->d_parent && !d_unhashed(dentry)) /* * Locking the parent is needed to: * - serialize directory operations * - make sure the parent doesn't change from * under us in the middle of an operation. * * NOTE! Right now we'd rather use a "struct inode" * for this, but as I expect things to move toward * using dentries instead for most things it is * probably better to start with the conceptually * better interface of relying on a path of dentries. */ static inline struct dentry *lock_parent(struct dentry *dentry) { struct dentry *dir = dget(dentry->d_parent); down(&dir->d_inode->i_sem); return dir; } static inline struct dentry *get_parent(struct dentry *dentry) { return dget(dentry->d_parent); } static inline void unlock_dir(struct dentry *dir) { up(&dir->d_inode->i_sem); dput(dir); } /* * Whee.. Deadlock country. Happily there are only two VFS * operations that does this.. */ static inline void double_down(struct semaphore *s1, struct semaphore *s2) { if (s1 != s2) { if ((unsigned long) s1 < (unsigned long) s2) { struct semaphore *tmp = s2; s2 = s1; s1 = tmp; } down(s1); } down(s2); } /* * Ewwwwwwww... _triple_ lock. We are guaranteed that the 3rd argument is * not equal to 1st and not equal to 2nd - the first case (target is parent of * source) would be already caught, the second is plain impossible (target is * its own parent and that case would be caught even earlier). Very messy. * I _think_ that it works, but no warranties - please, look it through. * Pox on bloody lusers who mandated overwriting rename() for directories... */ static inline void triple_down(struct semaphore *s1, struct semaphore *s2, struct semaphore *s3) { if (s1 != s2) { if ((unsigned long) s1 < (unsigned long) s2) { if ((unsigned long) s1 < (unsigned long) s3) { struct semaphore *tmp = s3; s3 = s1; s1 = tmp; } if ((unsigned long) s1 < (unsigned long) s2) { struct semaphore *tmp = s2; s2 = s1; s1 = tmp; } } else { if ((unsigned long) s1 < (unsigned long) s3) { struct semaphore *tmp = s3; s3 = s1; s1 = tmp; } if ((unsigned long) s2 < (unsigned long) s3) { struct semaphore *tmp = s3; s3 = s2; s2 = tmp; } } down(s1); } else if ((unsigned long) s2 < (unsigned long) s3) { struct semaphore *tmp = s3; s3 = s2; s2 = tmp; } down(s2); down(s3); } static inline void double_up(struct semaphore *s1, struct semaphore *s2) { up(s1); if (s1 != s2) up(s2); } static inline void triple_up(struct semaphore *s1, struct semaphore *s2, struct semaphore *s3) { up(s1); if (s1 != s2) up(s2); up(s3); } static inline void double_lock(struct dentry *d1, struct dentry *d2) { double_down(&d1->d_inode->i_sem, &d2->d_inode->i_sem); } static inline void double_unlock(struct dentry *d1, struct dentry *d2) { double_up(&d1->d_inode->i_sem,&d2->d_inode->i_sem); dput(d1); dput(d2); } #endif /* __KERNEL__ */ #endif /* _LINUX_FS_H */