| #ifndef _LINUX_FS_H |
| #define _LINUX_FS_H |
| |
| /* |
| * This file has definitions for some important file table |
| * structures etc. |
| */ |
| |
| #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) |
| |
| #define SEEK_SET 0 /* seek relative to beginning of file */ |
| #define SEEK_CUR 1 /* seek relative to current file position */ |
| #define SEEK_END 2 /* seek relative to end of file */ |
| |
| /* 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; |
| extern int get_max_files(void); |
| |
| 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 */ |
| |
| /* File is being opened for execution. Primary users of this flag are |
| distributed filesystems that can use it to achieve correct ETXTBUSY |
| behavior for cross-node execution/opening_for_writing of files */ |
| #define FMODE_EXEC 16 |
| |
| #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 SWRITE 3 /* for ll_rw_block() - wait for buffer lock */ |
| #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_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() |
| * during rename() internally. |
| */ |
| |
| /* |
| * 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 /* War is peace. Verbosity is silence. |
| MS_VERBOSE is deprecated. */ |
| #define MS_SILENT 32768 |
| #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */ |
| #define MS_UNBINDABLE (1<<17) /* change to unbindable */ |
| #define MS_PRIVATE (1<<18) /* change to private */ |
| #define MS_SLAVE (1<<19) /* change to slave */ |
| #define MS_SHARED (1<<20) /* change to shared */ |
| #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) |
| |
| /* |
| * 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_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 BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup) |
| #define BLKTRACESTART _IO(0x12,116) |
| #define BLKTRACESTOP _IO(0x12,117) |
| #define BLKTRACETEARDOWN _IO(0x12,118) |
| |
| #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 */ |
| |
| #define SYNC_FILE_RANGE_WAIT_BEFORE 1 |
| #define SYNC_FILE_RANGE_WRITE 2 |
| #define SYNC_FILE_RANGE_WAIT_AFTER 4 |
| |
| #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 <linux/sched.h> |
| #include <linux/mutex.h> |
| |
| #include <asm/atomic.h> |
| #include <asm/semaphore.h> |
| #include <asm/byteorder.h> |
| |
| struct hd_geometry; |
| struct iovec; |
| struct nameidata; |
| struct kiocb; |
| struct pipe_inode_info; |
| struct poll_table_struct; |
| struct kstatfs; |
| struct vm_area_struct; |
| struct vfsmount; |
| |
| 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 void (dio_iodone_t)(struct kiocb *iocb, 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 |
| #define ATTR_FILE 8192 |
| |
| /* |
| * 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; |
| |
| /* |
| * Not an attribute, but an auxilary info for filesystems wanting to |
| * implement an ftruncate() like method. NOTE: filesystem should |
| * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL). |
| */ |
| struct file *ia_file; |
| }; |
| |
| /* |
| * Includes for diskquotas. |
| */ |
| #include <linux/quota.h> |
| |
| /** |
| * enum positive_aop_returns - aop return codes with specific semantics |
| * |
| * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has |
| * completed, that the page is still locked, and |
| * should be considered active. The VM uses this hint |
| * to return the page to the active list -- it won't |
| * be a candidate for writeback again in the near |
| * future. Other callers must be careful to unlock |
| * the page if they get this return. Returned by |
| * writepage(); |
| * |
| * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has |
| * unlocked it and the page might have been truncated. |
| * The caller should back up to acquiring a new page and |
| * trying again. The aop will be taking reasonable |
| * precautions not to livelock. If the caller held a page |
| * reference, it should drop it before retrying. Returned |
| * by readpage(), prepare_write(), and commit_write(). |
| * |
| * address_space_operation functions return these large constants to indicate |
| * special semantics to the caller. These are much larger than the bytes in a |
| * page to allow for functions that return the number of bytes operated on in a |
| * given page. |
| */ |
| |
| enum positive_aop_returns { |
| AOP_WRITEPAGE_ACTIVATE = 0x80000, |
| AOP_TRUNCATED_PAGE = 0x80001, |
| }; |
| |
| /* |
| * oh the beauties of C type declarations. |
| */ |
| struct page; |
| struct address_space; |
| struct writeback_control; |
| |
| struct address_space_operations { |
| int (*writepage)(struct page *page, struct writeback_control *wbc); |
| int (*readpage)(struct file *, struct page *); |
| void (*sync_page)(struct page *); |
| |
| /* Write back some dirty pages from this mapping. */ |
| int (*writepages)(struct address_space *, struct writeback_control *); |
| |
| /* Set a page dirty. Return true if this dirtied it */ |
| 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); |
| void (*invalidatepage) (struct page *, unsigned long); |
| int (*releasepage) (struct page *, gfp_t); |
| ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov, |
| loff_t offset, unsigned long nr_segs); |
| struct page* (*get_xip_page)(struct address_space *, sector_t, |
| int); |
| /* migrate the contents of a page to the specified target */ |
| int (*migratepage) (struct address_space *, |
| struct page *, struct page *); |
| }; |
| |
| 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 */ |
| const 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 mutex bd_mutex; /* open/close mutex */ |
| struct mutex bd_mount_mutex; /* mount mutex */ |
| struct list_head bd_inodes; |
| void * bd_holder; |
| int bd_holders; |
| #ifdef CONFIG_SYSFS |
| struct list_head bd_holder_list; |
| #endif |
| 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; |
| }; |
| |
| /* |
| * bdev->bd_mutex nesting subclasses for the lock validator: |
| * |
| * 0: normal |
| * 1: 'whole' |
| * 2: 'partition' |
| */ |
| enum bdev_bd_mutex_lock_class |
| { |
| BD_MUTEX_NORMAL, |
| BD_MUTEX_WHOLE, |
| BD_MUTEX_PARTITION |
| }; |
| |
| |
| /* |
| * 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_version; |
| blkcnt_t i_blocks; |
| unsigned short i_bytes; |
| spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ |
| struct mutex i_mutex; |
| struct rw_semaphore i_alloc_sem; |
| struct inode_operations *i_op; |
| const 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 |
| struct list_head i_devices; |
| union { |
| 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 |
| |
| #ifdef CONFIG_INOTIFY |
| struct list_head inotify_watches; /* watches on this inode */ |
| struct mutex inotify_mutex; /* protects the watches list */ |
| #endif |
| |
| unsigned long i_state; |
| unsigned long dirtied_when; /* jiffies of first dirtying */ |
| |
| unsigned int i_flags; |
| |
| atomic_t i_writecount; |
| #ifdef CONFIG_SECURITY |
| void *i_security; |
| #endif |
| void *i_private; /* fs or device private pointer */ |
| #ifdef __NEED_I_SIZE_ORDERED |
| seqcount_t i_size_seqcount; |
| #endif |
| }; |
| |
| /* |
| * inode->i_mutex nesting subclasses for the lock validator: |
| * |
| * 0: the object of the current VFS operation |
| * 1: parent |
| * 2: child/target |
| * 3: quota file |
| * |
| * The locking order between these classes is |
| * parent -> child -> normal -> xattr -> quota |
| */ |
| enum inode_i_mutex_lock_class |
| { |
| I_MUTEX_NORMAL, |
| I_MUTEX_PARENT, |
| I_MUTEX_CHILD, |
| I_MUTEX_XATTR, |
| I_MUTEX_QUOTA |
| }; |
| |
| /* |
| * 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 */ |
| 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 { |
| /* |
| * fu_list becomes invalid after file_free is called and queued via |
| * fu_rcuhead for RCU freeing |
| */ |
| union { |
| struct list_head fu_list; |
| struct rcu_head fu_rcuhead; |
| } f_u; |
| struct dentry *f_dentry; |
| struct vfsmount *f_vfsmnt; |
| const struct file_operations *f_op; |
| atomic_t f_count; |
| unsigned int f_flags; |
| mode_t f_mode; |
| loff_t f_pos; |
| struct fown_struct f_owner; |
| unsigned int f_uid, f_gid; |
| struct file_ra_state f_ra; |
| |
| unsigned long f_version; |
| #ifdef CONFIG_SECURITY |
| void *f_security; |
| #endif |
| /* 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_EXISTS 16 /* when unlocking, test for existence */ |
| #define FL_LEASE 32 /* lease held on this file */ |
| #define FL_CLOSE 64 /* unlock on close */ |
| #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; |
| struct nfs4_lock_info nfs4_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 |
| |
| #include <linux/fcntl.h> |
| |
| extern int fcntl_getlk(struct file *, struct flock __user *); |
| extern int fcntl_setlk(unsigned int, 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(unsigned int, 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/sync.c */ |
| extern int do_sync_file_range(struct file *file, loff_t offset, loff_t endbyte, |
| unsigned int flags); |
| |
| /* 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 int posix_test_lock(struct file *, struct file_lock *, struct file_lock *); |
| extern int posix_lock_file_conf(struct file *, struct file_lock *, 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 int posix_unblock_lock(struct file *, 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); |
| |
| 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 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 mutex s_lock; |
| int s_count; |
| int s_syncing; |
| int s_need_sync_fs; |
| atomic_t s_active; |
| #ifdef CONFIG_SECURITY |
| void *s_security; |
| #endif |
| 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 mutex s_vfs_rename_mutex; /* Kludge */ |
| |
| /* Granularity 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))) |
| |
| static inline void get_fs_excl(void) |
| { |
| atomic_inc(¤t->fs_excl); |
| } |
| |
| static inline void put_fs_excl(void) |
| { |
| atomic_dec(¤t->fs_excl); |
| } |
| |
| static inline int has_fs_excl(void) |
| { |
| return atomic_read(¤t->fs_excl); |
| } |
| |
| |
| /* |
| * Superblock locking. |
| */ |
| static inline void lock_super(struct super_block * sb) |
| { |
| get_fs_excl(); |
| mutex_lock(&sb->s_lock); |
| } |
| |
| static inline void unlock_super(struct super_block * sb) |
| { |
| put_fs_excl(); |
| mutex_unlock(&sb->s_lock); |
| } |
| |
| /* |
| * VFS helper functions.. |
| */ |
| extern int vfs_permission(struct nameidata *, int); |
| 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); |
| |
| /* |
| * VFS file helper functions. |
| */ |
| extern int file_permission(struct file *, int); |
| |
| /* |
| * 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 (*unlocked_ioctl) (struct file *, unsigned, unsigned long); |
| long (*compat_ioctl) (struct file *, unsigned, unsigned long); |
| int (*direct_access) (struct block_device *, sector_t, unsigned long *); |
| int (*media_changed) (struct gendisk *); |
| int (*revalidate_disk) (struct gendisk *); |
| int (*getgeo)(struct block_device *, struct hd_geometry *); |
| 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 *, fl_owner_t id); |
| 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 *); |
| ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int); |
| ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int); |
| }; |
| |
| 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); |
| void * (*follow_link) (struct dentry *, struct nameidata *); |
| void (*put_link) (struct dentry *, struct nameidata *, void *); |
| 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 *); |
| void (*truncate_range)(struct inode *, loff_t, loff_t); |
| }; |
| |
| 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 dentry *, struct kstatfs *); |
| int (*remount_fs) (struct super_block *, int *, char *); |
| void (*clear_inode) (struct inode *); |
| void (*umount_begin) (struct vfsmount *, int); |
| |
| int (*show_options)(struct seq_file *, struct vfsmount *); |
| int (*show_stats)(struct seq_file *, struct vfsmount *); |
| #ifdef CONFIG_QUOTA |
| 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); |
| #endif |
| }; |
| |
| /* 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_WILL_FREE 128 |
| |
| #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 inode_inc_link_count(struct inode *inode) |
| { |
| inode->i_nlink++; |
| mark_inode_dirty(inode); |
| } |
| |
| static inline void inode_dec_link_count(struct inode *inode) |
| { |
| inode->i_nlink--; |
| mark_inode_dirty(inode); |
| } |
| |
| extern void touch_atime(struct vfsmount *mnt, struct dentry *dentry); |
| 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); |
| |
| /** |
| * struct 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 |
| * @find_exported_dentry: |
| * set by the exporting module to a standard helper function. |
| * |
| * 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_mutex 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_mutex 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; |
| int (*get_sb) (struct file_system_type *, int, |
| const char *, void *, struct vfsmount *); |
| void (*kill_sb) (struct super_block *); |
| struct module *owner; |
| struct file_system_type * next; |
| struct list_head fs_supers; |
| struct lock_class_key s_lock_key; |
| struct lock_class_key s_umount_key; |
| }; |
| |
| extern int 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 vfsmount *mnt); |
| extern int get_sb_single(struct file_system_type *fs_type, |
| int flags, void *data, |
| int (*fill_super)(struct super_block *, void *, int), |
| struct vfsmount *mnt); |
| extern int get_sb_nodev(struct file_system_type *fs_type, |
| int flags, void *data, |
| int (*fill_super)(struct super_block *, void *, int), |
| struct vfsmount *mnt); |
| 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); |
| extern int get_sb_pseudo(struct file_system_type *, char *, |
| struct super_operations *ops, unsigned long, |
| struct vfsmount *mnt); |
| extern int simple_set_mnt(struct vfsmount *mnt, struct super_block *sb); |
| 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 void umount_tree(struct vfsmount *, int, struct list_head *); |
| extern void release_mounts(struct list_head *); |
| extern long do_mount(char *, char *, char *, unsigned long, void *); |
| extern struct vfsmount *copy_tree(struct vfsmount *, struct dentry *, int); |
| extern void mnt_set_mountpoint(struct vfsmount *, struct dentry *, |
| struct vfsmount *); |
| |
| extern int vfs_statfs(struct dentry *, struct kstatfs *); |
| |
| /* /sys/fs */ |
| extern struct subsystem fs_subsys; |
| |
| #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, unsigned int time_attrs, |
| struct file *filp); |
| extern long do_sys_open(int fdf, const char __user *filename, int flags, |
| int mode); |
| 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 block_device *open_partition_by_devnum(dev_t, unsigned); |
| extern const struct file_operations def_blk_fops; |
| extern const struct address_space_operations def_blk_aops; |
| extern const struct file_operations def_chr_fops; |
| extern const struct file_operations bad_sock_fops; |
| extern const 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 blkdev_put_partition(struct block_device *); |
| extern int bd_claim(struct block_device *, void *); |
| extern void bd_release(struct block_device *); |
| #ifdef CONFIG_SYSFS |
| extern int bd_claim_by_disk(struct block_device *, void *, struct gendisk *); |
| extern void bd_release_from_disk(struct block_device *, struct gendisk *); |
| #else |
| #define bd_claim_by_disk(bdev, holder, disk) bd_claim(bdev, holder) |
| #define bd_release_from_disk(bdev, disk) bd_release(bdev) |
| #endif |
| |
| /* fs/char_dev.c */ |
| #define CHRDEV_MAJOR_HASH_SIZE 255 |
| 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 *, |
| const 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 *); |
| extern void chrdev_show(struct seq_file *,off_t); |
| |
| /* fs/block_dev.c */ |
| #define BLKDEV_MAJOR_HASH_SIZE 255 |
| #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 blkdev_show(struct seq_file *,off_t); |
| |
| 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 const struct file_operations read_fifo_fops; |
| extern const struct file_operations write_fifo_fops; |
| extern const struct file_operations rdwr_fifo_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 *); |
| 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 int wait_on_page_writeback_range(struct address_space *mapping, |
| pgoff_t start, pgoff_t end); |
| extern int __filemap_fdatawrite_range(struct address_space *mapping, |
| loff_t start, loff_t end, int sync_mode); |
| |
| extern long do_fsync(struct file *file, int datasync); |
| 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 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(int dfd, 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 void generic_drop_inode(struct inode *inode); |
| |
| extern struct inode *ilookup5_nowait(struct super_block *sb, |
| unsigned long hashval, int (*test)(struct inode *, void *), |
| void *data); |
| 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 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); |
| |
| /* fs/splice.c */ |
| extern ssize_t generic_file_splice_read(struct file *, loff_t *, |
| struct pipe_inode_info *, size_t, unsigned int); |
| extern ssize_t generic_file_splice_write(struct pipe_inode_info *, |
| struct file *, loff_t *, size_t, unsigned int); |
| extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe, |
| struct file *out, loff_t *, size_t len, unsigned int flags); |
| extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out, |
| size_t len, unsigned int flags); |
| |
| extern void |
| file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping); |
| 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); |
| |
| #ifdef CONFIG_FS_XIP |
| extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len, |
| loff_t *ppos); |
| extern ssize_t xip_file_sendfile(struct file *in_file, loff_t *ppos, |
| size_t count, read_actor_t actor, |
| void *target); |
| extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma); |
| extern ssize_t xip_file_write(struct file *filp, const char __user *buf, |
| size_t len, loff_t *ppos); |
| extern int xip_truncate_page(struct address_space *mapping, loff_t from); |
| #else |
| static inline int xip_truncate_page(struct address_space *mapping, loff_t from) |
| { |
| return 0; |
| } |
| #endif |
| |
| 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_block_t get_block, 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_block_t get_block, |
| dio_iodone_t end_io) |
| { |
| return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, |
| nr_segs, get_block, 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_block_t get_block, |
| dio_iodone_t end_io) |
| { |
| return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, |
| nr_segs, get_block, 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_block_t get_block, |
| dio_iodone_t end_io) |
| { |
| return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, |
| nr_segs, get_block, end_io, DIO_OWN_LOCKING); |
| } |
| |
| extern const 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 void *page_follow_link_light(struct dentry *, struct nameidata *); |
| extern void page_put_link(struct dentry *, struct nameidata *, void *); |
| extern int __page_symlink(struct inode *inode, const char *symname, int len, |
| gfp_t gfp_mask); |
| 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_stat_fd(int dfd, char __user *, struct kstat *); |
| extern int vfs_lstat_fd(int dfd, 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 dentry *, 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 const struct file_operations simple_dir_operations; |
| extern struct inode_operations simple_dir_inode_operations; |
| struct tree_descr { char *name; const 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(struct file_system_type *, 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); |
| |
| #ifdef CONFIG_MIGRATION |
| extern int buffer_migrate_page(struct address_space *, |
| struct page *, struct page *); |
| #else |
| #define buffer_migrate_page NULL |
| #endif |
| |
| extern int inode_change_ok(struct inode *, struct iattr *); |
| extern int __must_check inode_setattr(struct inode *, struct iattr *); |
| |
| extern void file_update_time(struct file *file); |
| |
| 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; |
| } |
| |
| /* |
| * simple attribute files |
| * |
| * These attributes behave similar to those in sysfs: |
| * |
| * Writing to an attribute immediately sets a value, an open file can be |
| * written to multiple times. |
| * |
| * Reading from an attribute creates a buffer from the value that might get |
| * read with multiple read calls. When the attribute has been read |
| * completely, no further read calls are possible until the file is opened |
| * again. |
| * |
| * All attributes contain a text representation of a numeric value |
| * that are accessed with the get() and set() functions. |
| */ |
| #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \ |
| static int __fops ## _open(struct inode *inode, struct file *file) \ |
| { \ |
| __simple_attr_check_format(__fmt, 0ull); \ |
| return simple_attr_open(inode, file, __get, __set, __fmt); \ |
| } \ |
| static struct file_operations __fops = { \ |
| .owner = THIS_MODULE, \ |
| .open = __fops ## _open, \ |
| .release = simple_attr_close, \ |
| .read = simple_attr_read, \ |
| .write = simple_attr_write, \ |
| }; |
| |
| static inline void __attribute__((format(printf, 1, 2))) |
| __simple_attr_check_format(const char *fmt, ...) |
| { |
| /* don't do anything, just let the compiler check the arguments; */ |
| } |
| |
| int simple_attr_open(struct inode *inode, struct file *file, |
| u64 (*get)(void *), void (*set)(void *, u64), |
| const char *fmt); |
| int simple_attr_close(struct inode *inode, struct file *file); |
| ssize_t simple_attr_read(struct file *file, char __user *buf, |
| size_t len, loff_t *ppos); |
| ssize_t simple_attr_write(struct file *file, const char __user *buf, |
| size_t len, loff_t *ppos); |
| |
| |
| #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 */ |