From 7996a3d79d55b7f879dfd62e202bbfe2963718d3 Mon Sep 17 00:00:00 2001 From: Samuel Thibault Date: Sat, 27 Jul 2013 22:15:01 +0000 Subject: really properly move files --- .../libdde_linux26/contrib/include/linux/fs.h | 2261 -------------------- 1 file changed, 2261 deletions(-) delete mode 100644 libdde-linux26/libdde_linux26/contrib/include/linux/fs.h (limited to 'libdde-linux26/libdde_linux26/contrib/include/linux/fs.h') diff --git a/libdde-linux26/libdde_linux26/contrib/include/linux/fs.h b/libdde-linux26/libdde_linux26/contrib/include/linux/fs.h deleted file mode 100644 index 92734c00..00000000 --- a/libdde-linux26/libdde_linux26/contrib/include/linux/fs.h +++ /dev/null @@ -1,2261 +0,0 @@ -#ifndef _LINUX_FS_H -#define _LINUX_FS_H - -/* - * This file has definitions for some important file table - * structures etc. - */ - -#include -#include - -/* - * 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 INR_OPEN 1024 /* Initial setting for nfile rlimits */ - -#define BLOCK_SIZE_BITS 10 -#define BLOCK_SIZE (1<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_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME) -#define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION) - -#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 BLKDISCARD _IO(0x12,119) - -#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 FIFREEZE _IOWR('X', 119, int) /* Freeze */ -#define FITHAW _IOWR('X', 120, int) /* Thaw */ - -#define FS_IOC_GETFLAGS _IOR('f', 1, long) -#define FS_IOC_SETFLAGS _IOW('f', 2, long) -#define FS_IOC_GETVERSION _IOR('v', 1, long) -#define FS_IOC_SETVERSION _IOW('v', 2, long) -#define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap) -#define FS_IOC32_GETFLAGS _IOR('f', 1, int) -#define FS_IOC32_SETFLAGS _IOW('f', 2, int) -#define FS_IOC32_GETVERSION _IOR('v', 1, int) -#define FS_IOC32_SETVERSION _IOW('v', 2, int) - -/* - * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS) - */ -#define FS_SECRM_FL 0x00000001 /* Secure deletion */ -#define FS_UNRM_FL 0x00000002 /* Undelete */ -#define FS_COMPR_FL 0x00000004 /* Compress file */ -#define FS_SYNC_FL 0x00000008 /* Synchronous updates */ -#define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */ -#define FS_APPEND_FL 0x00000020 /* writes to file may only append */ -#define FS_NODUMP_FL 0x00000040 /* do not dump file */ -#define FS_NOATIME_FL 0x00000080 /* do not update atime */ -/* Reserved for compression usage... */ -#define FS_DIRTY_FL 0x00000100 -#define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ -#define FS_NOCOMP_FL 0x00000400 /* Don't compress */ -#define FS_ECOMPR_FL 0x00000800 /* Compression error */ -/* End compression flags --- maybe not all used */ -#define FS_BTREE_FL 0x00001000 /* btree format dir */ -#define FS_INDEX_FL 0x00001000 /* hash-indexed directory */ -#define FS_IMAGIC_FL 0x00002000 /* AFS directory */ -#define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */ -#define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */ -#define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ -#define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ -#define FS_EXTENT_FL 0x00080000 /* Extents */ -#define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */ -#define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ - -#define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */ -#define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */ - - -#define SYNC_FILE_RANGE_WAIT_BEFORE 1 -#define SYNC_FILE_RANGE_WRITE 2 -#define SYNC_FILE_RANGE_WAIT_AFTER 4 - -#ifdef __KERNEL__ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include - -struct export_operations; -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; -struct cred; - -extern void __init inode_init(void); -extern void __init inode_init_early(void); -extern void __init files_init(unsigned long); - -extern struct files_stat_struct files_stat; -extern int get_max_files(void); -extern int sysctl_nr_open; -extern struct inodes_stat_t inodes_stat; -extern int leases_enable, lease_break_time; -#ifdef CONFIG_DNOTIFY -extern int dir_notify_enable; -#endif - -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 << 0) -#define ATTR_UID (1 << 1) -#define ATTR_GID (1 << 2) -#define ATTR_SIZE (1 << 3) -#define ATTR_ATIME (1 << 4) -#define ATTR_MTIME (1 << 5) -#define ATTR_CTIME (1 << 6) -#define ATTR_ATIME_SET (1 << 7) -#define ATTR_MTIME_SET (1 << 8) -#define ATTR_FORCE (1 << 9) /* Not a change, but a change it */ -#define ATTR_ATTR_FLAG (1 << 10) -#define ATTR_KILL_SUID (1 << 11) -#define ATTR_KILL_SGID (1 << 12) -#define ATTR_FILE (1 << 13) -#define ATTR_KILL_PRIV (1 << 14) -#define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */ -#define ATTR_TIMES_SET (1 << 16) - -/* - * 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; - 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 - -/** - * 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(). - * - * 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, -}; - -#define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */ -#define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */ -#define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct - * helper code (eg buffer layer) - * to clear GFP_FS from alloc */ - -/* - * oh the beauties of C type declarations. - */ -struct page; -struct address_space; -struct writeback_control; - -struct iov_iter { - const struct iovec *iov; - unsigned long nr_segs; - size_t iov_offset; - size_t count; -}; - -size_t iov_iter_copy_from_user_atomic(struct page *page, - struct iov_iter *i, unsigned long offset, size_t bytes); -size_t iov_iter_copy_from_user(struct page *page, - struct iov_iter *i, unsigned long offset, size_t bytes); -void iov_iter_advance(struct iov_iter *i, size_t bytes); -int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes); -size_t iov_iter_single_seg_count(struct iov_iter *i); - -static inline void iov_iter_init(struct iov_iter *i, - const struct iovec *iov, unsigned long nr_segs, - size_t count, size_t written) -{ - i->iov = iov; - i->nr_segs = nr_segs; - i->iov_offset = 0; - i->count = count + written; - - iov_iter_advance(i, written); -} - -static inline size_t iov_iter_count(struct iov_iter *i) -{ - return i->count; -} - -/* - * "descriptor" for what we're up to with a read. - * 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); - -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); - - int (*write_begin)(struct file *, struct address_space *mapping, - loff_t pos, unsigned len, unsigned flags, - struct page **pagep, void **fsdata); - int (*write_end)(struct file *, struct address_space *mapping, - loff_t pos, unsigned len, unsigned copied, - struct page *page, void *fsdata); - - /* 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); - int (*get_xip_mem)(struct address_space *, pgoff_t, int, - void **, unsigned long *); - /* migrate the contents of a page to the specified target */ - int (*migratepage) (struct address_space *, - struct page *, struct page *); - int (*launder_page) (struct page *); - int (*is_partially_uptodate) (struct page *, read_descriptor_t *, - unsigned long); -}; - -/* - * pagecache_write_begin/pagecache_write_end must be used by general code - * to write into the pagecache. - */ -int pagecache_write_begin(struct file *, struct address_space *mapping, - loff_t pos, unsigned len, unsigned flags, - struct page **pagep, void **fsdata); - -int pagecache_write_end(struct file *, struct address_space *mapping, - loff_t pos, unsigned len, unsigned copied, - struct page *page, void *fsdata); - -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 */ - spinlock_t tree_lock; /* and lock 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 */ - struct super_block * bd_super; - int bd_openers; - struct mutex bd_mutex; /* open/close mutex */ - struct semaphore bd_mount_sem; - 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; - - /* The counter of freeze processes */ - int bd_fsfreeze_count; - /* Mutex for freeze */ - struct mutex bd_fsfreeze_mutex; -}; - -/* - * 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 -#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; - unsigned int i_nlink; - uid_t i_uid; - gid_t i_gid; - dev_t i_rdev; - u64 i_version; - loff_t i_size; -#ifdef __NEED_I_SIZE_ORDERED - seqcount_t i_size_seqcount; -#endif - struct timespec i_atime; - struct timespec i_mtime; - struct timespec i_ctime; - unsigned int i_blkbits; - blkcnt_t i_blocks; - unsigned short i_bytes; - umode_t i_mode; - spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ - struct mutex i_mutex; - struct rw_semaphore i_alloc_sem; - const 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 */ -}; - -/* - * 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 -}; - -extern void inode_double_lock(struct inode *inode1, struct inode *inode2); -extern void inode_double_unlock(struct inode *inode1, struct inode *inode2); - -/* - * 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(const 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 -} - -/* - * NOTE: unlike i_size_read(), i_size_write() does need locking around it - * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount - * can be lost, resulting in subsequent i_size_read() calls spinning forever. - */ -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(const struct inode *inode) -{ - return MINOR(inode->i_rdev); -} - -static inline unsigned imajor(const 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 */ - struct pid *pid; /* pid or -pgrp where SIGIO should be sent */ - enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */ - 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 { - pgoff_t start; /* where readahead started */ - unsigned int size; /* # of readahead pages */ - unsigned int async_size; /* do asynchronous readahead when - there are only # of pages ahead */ - - unsigned int ra_pages; /* Maximum readahead window */ - int mmap_miss; /* Cache miss stat for mmap accesses */ - loff_t prev_pos; /* Cache last read() position */ -}; - -/* - * Check if @index falls in the readahead windows. - */ -static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index) -{ - return (index >= ra->start && - index < ra->start + ra->size); -} - -#define FILE_MNT_WRITE_TAKEN 1 -#define FILE_MNT_WRITE_RELEASED 2 - -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 path f_path; -#define f_dentry f_path.dentry -#define f_vfsmnt f_path.mnt - const struct file_operations *f_op; - atomic_long_t f_count; - unsigned int f_flags; - fmode_t f_mode; - loff_t f_pos; - struct fown_struct f_owner; - const struct cred *f_cred; - struct file_ra_state f_ra; - - u64 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; -#ifdef CONFIG_DEBUG_WRITECOUNT - unsigned long f_mnt_write_state; -#endif -}; -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_long_inc(&(x)->f_count) -#define file_count(x) atomic_long_read(&(x)->f_count) - -#ifdef CONFIG_DEBUG_WRITECOUNT -static inline void file_take_write(struct file *f) -{ - WARN_ON(f->f_mnt_write_state != 0); - f->f_mnt_write_state = FILE_MNT_WRITE_TAKEN; -} -static inline void file_release_write(struct file *f) -{ - f->f_mnt_write_state |= FILE_MNT_WRITE_RELEASED; -} -static inline void file_reset_write(struct file *f) -{ - f->f_mnt_write_state = 0; -} -static inline void file_check_state(struct file *f) -{ - /* - * At this point, either both or neither of these bits - * should be set. - */ - WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN); - WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_RELEASED); -} -static inline int file_check_writeable(struct file *f) -{ - if (f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN) - return 0; - printk(KERN_WARNING "writeable file with no " - "mnt_want_write()\n"); - WARN_ON(1); - return -EINVAL; -} -#else /* !CONFIG_DEBUG_WRITECOUNT */ -static inline void file_take_write(struct file *filp) {} -static inline void file_release_write(struct file *filp) {} -static inline void file_reset_write(struct file *filp) {} -static inline void file_check_state(struct file *filp) {} -static inline int file_check_writeable(struct file *filp) -{ - return 0; -} -#endif /* CONFIG_DEBUG_WRITECOUNT */ - -#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 */ - -/* - * Special return value from posix_lock_file() and vfs_lock_file() for - * asynchronous locking. - */ -#define FILE_LOCK_DEFERRED 1 - -/* - * 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_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 */ - int (*fl_grant)(struct file_lock *, struct file_lock *, int); - 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); -}; - -struct lock_manager { - struct list_head list; -}; - -void locks_start_grace(struct lock_manager *); -void locks_end_grace(struct lock_manager *); -int locks_in_grace(void); - -/* that will die - we need it for nfs_lock_info */ -#include - -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 char fl_flags; - unsigned char fl_type; - unsigned int fl_pid; - struct pid *fl_nspid; - wait_queue_head_t fl_wait; - struct file *fl_file; - 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; - struct { - struct list_head link; /* link in AFS vnode's pending_locks list */ - int state; /* state of grant or error if -ve */ - } afs; - } 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 - -extern void send_sigio(struct fown_struct *fown, int fd, int band); - -/* fs/sync.c */ -extern int do_sync_mapping_range(struct address_space *mapping, loff_t offset, - loff_t endbyte, unsigned int flags); - -#ifdef CONFIG_FILE_LOCKING -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 int fcntl_setlease(unsigned int fd, struct file *filp, long arg); -extern int fcntl_getlease(struct file *filp); - -/* fs/locks.c */ -extern void locks_init_lock(struct file_lock *); -extern void locks_copy_lock(struct file_lock *, struct file_lock *); -extern void __locks_copy_lock(struct file_lock *, const struct file_lock *); -extern void locks_remove_posix(struct file *, fl_owner_t); -extern void locks_remove_flock(struct file *); -extern void posix_test_lock(struct file *, struct file_lock *); -extern int posix_lock_file(struct file *, struct file_lock *, 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 vfs_test_lock(struct file *, struct file_lock *); -extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *); -extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl); -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 generic_setlease(struct file *, long, struct file_lock **); -extern int vfs_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); -#else /* !CONFIG_FILE_LOCKING */ -#define fcntl_getlk(a, b) ({ -EINVAL; }) -#define fcntl_setlk(a, b, c, d) ({ -EACCES; }) -#if BITS_PER_LONG == 32 -#define fcntl_getlk64(a, b) ({ -EINVAL; }) -#define fcntl_setlk64(a, b, c, d) ({ -EACCES; }) -#endif -#define fcntl_setlease(a, b, c) ({ 0; }) -#define fcntl_getlease(a) ({ 0; }) -#define locks_init_lock(a) ({ }) -#define __locks_copy_lock(a, b) ({ }) -#define locks_copy_lock(a, b) ({ }) -#define locks_remove_posix(a, b) ({ }) -#define locks_remove_flock(a) ({ }) -#define posix_test_lock(a, b) ({ 0; }) -#define posix_lock_file(a, b, c) ({ -ENOLCK; }) -#define posix_lock_file_wait(a, b) ({ -ENOLCK; }) -#define posix_unblock_lock(a, b) (-ENOENT) -#define vfs_test_lock(a, b) ({ 0; }) -#define vfs_lock_file(a, b, c, d) (-ENOLCK) -#define vfs_cancel_lock(a, b) ({ 0; }) -#define flock_lock_file_wait(a, b) ({ -ENOLCK; }) -#define __break_lease(a, b) ({ 0; }) -#define lease_get_mtime(a, b) ({ }) -#define generic_setlease(a, b, c) ({ -EINVAL; }) -#define vfs_setlease(a, b, c) ({ -EINVAL; }) -#define lease_modify(a, b) ({ -EINVAL; }) -#define lock_may_read(a, b, c) ({ 1; }) -#define lock_may_write(a, b, c) ({ 1; }) -#endif /* !CONFIG_FILE_LOCKING */ - - -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, struct pid *, enum pid_type, int force); -extern int f_setown(struct file *filp, unsigned long arg, int force); -extern void f_delown(struct file *filp); -extern pid_t f_getown(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; - const struct super_operations *s_op; - struct dquot_operations *dq_op; - struct quotactl_ops *s_qcop; - const 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_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 list_head s_more_io; /* parked for more writeback */ - struct hlist_head s_anon; /* anonymous dentries for (nfs) exporting */ - struct list_head s_files; - /* s_dentry_lru and s_nr_dentry_unused are protected by dcache_lock */ - struct list_head s_dentry_lru; /* unused dentry lru */ - int s_nr_dentry_unused; /* # of dentry on lru */ - - struct block_device *s_bdev; - struct mtd_info *s_mtd; - 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 */ - fmode_t s_mode; - - /* - * 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; - - /* - * Filesystem subtype. If non-empty the filesystem type field - * in /proc/mounts will be "type.subtype" - */ - char *s_subtype; - - /* - * Saved mount options for lazy filesystems using - * generic_show_options() - */ - char *s_options; - - /* - * storage for asynchronous operations - */ - struct list_head s_async_list; -}; - -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))) - -#define get_fs_excl() atomic_inc(¤t->fs_excl) -#define put_fs_excl() atomic_dec(¤t->fs_excl) -#define has_fs_excl() atomic_read(¤t->fs_excl) - -#define is_owner_or_cap(inode) \ - ((current_fsuid() == (inode)->i_uid) || capable(CAP_FOWNER)) - -/* not quite ready to be deprecated, but... */ -extern void lock_super(struct super_block *); -extern void unlock_super(struct super_block *); - -/* - * VFS helper functions.. - */ -extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *); -extern int vfs_mkdir(struct inode *, struct dentry *, int); -extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t); -extern int vfs_symlink(struct inode *, struct dentry *, const char *); -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); - -/* - * VFS FS_IOC_FIEMAP helper definitions. - */ -struct fiemap_extent_info { - unsigned int fi_flags; /* Flags as passed from user */ - unsigned int fi_extents_mapped; /* Number of mapped extents */ - unsigned int fi_extents_max; /* Size of fiemap_extent array */ - struct fiemap_extent *fi_extents_start; /* Start of fiemap_extent - * array */ -}; -int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical, - u64 phys, u64 len, u32 flags); -int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags); - -/* - * 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, u64, unsigned); -struct block_device_operations; - -/* 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 (*write) (struct file *, const char __user *, size_t, loff_t *); - ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t); - ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, 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 (*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 (*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); - int (*setlease)(struct file *, long, struct file_lock **); -}; - -struct inode_operations { - int (*create) (struct inode *,struct dentry *,int, struct nameidata *); - struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *); - int (*link) (struct dentry *,struct inode *,struct dentry *); - int (*unlink) (struct inode *,struct dentry *); - int (*symlink) (struct inode *,struct dentry *,const char *); - int (*mkdir) (struct inode *,struct dentry *,int); - int (*rmdir) (struct inode *,struct dentry *); - int (*mknod) (struct inode *,struct dentry *,int,dev_t); - int (*rename) (struct inode *, struct dentry *, - struct inode *, struct dentry *); - int (*readlink) (struct dentry *, char __user *,int); - void * (*follow_link) (struct dentry *, struct nameidata *); - void (*put_link) (struct dentry *, struct nameidata *, void *); - void (*truncate) (struct inode *); - int (*permission) (struct inode *, int); - 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); - long (*fallocate)(struct inode *inode, int mode, loff_t offset, - loff_t len); - int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start, - u64 len); -}; - -struct seq_file; - -ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, - unsigned long nr_segs, unsigned long fast_segs, - struct iovec *fast_pointer, - struct iovec **ret_pointer); - -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 *); - -struct super_operations { - struct inode *(*alloc_inode)(struct super_block *sb); - void (*destroy_inode)(struct inode *); - - void (*dirty_inode) (struct inode *); - int (*write_inode) (struct inode *, int); - 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); - int (*freeze_fs) (struct super_block *); - int (*unfreeze_fs) (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 super_block *); - - 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 - int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t); -}; - -/* - * Inode state bits. Protected by inode_lock. - * - * Three bits determine the dirty state of the inode, I_DIRTY_SYNC, - * I_DIRTY_DATASYNC and I_DIRTY_PAGES. - * - * Four bits define the lifetime of an inode. Initially, inodes are I_NEW, - * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at - * various stages of removing an inode. - * - * Two bits are used for locking and completion notification, I_LOCK and I_SYNC. - * - * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on - * fdatasync(). i_atime is the usual cause. - * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of - * these changes separately from I_DIRTY_SYNC so that we - * don't have to write inode on fdatasync() when only - * mtime has changed in it. - * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean. - * I_NEW get_new_inode() sets i_state to I_LOCK|I_NEW. Both - * are cleared by unlock_new_inode(), called from iget(). - * I_WILL_FREE Must be set when calling write_inode_now() if i_count - * is zero. I_FREEING must be set when I_WILL_FREE is - * cleared. - * I_FREEING Set when inode is about to be freed but still has dirty - * pages or buffers attached or the inode itself is still - * dirty. - * I_CLEAR Set by clear_inode(). In this state the inode is clean - * and can be destroyed. - * - * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are - * prohibited for many purposes. iget() must wait for - * the inode to be completely released, then create it - * anew. Other functions will just ignore such inodes, - * if appropriate. I_LOCK is used for waiting. - * - * I_LOCK Serves as both a mutex and completion notification. - * New inodes set I_LOCK. If two processes both create - * the same inode, one of them will release its inode and - * wait for I_LOCK to be released before returning. - * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can - * also cause waiting on I_LOCK, without I_LOCK actually - * being set. find_inode() uses this to prevent returning - * nearly-dead inodes. - * I_SYNC Similar to I_LOCK, but limited in scope to writeback - * of inode dirty data. Having a separate lock for this - * purpose reduces latency and prevents some filesystem- - * specific deadlocks. - * - * Q: What is the difference between I_WILL_FREE and I_FREEING? - * Q: igrab() only checks on (I_FREEING|I_WILL_FREE). Should it also check on - * I_CLEAR? If not, why? - */ -#define I_DIRTY_SYNC 1 -#define I_DIRTY_DATASYNC 2 -#define I_DIRTY_PAGES 4 -#define I_NEW 8 -#define I_WILL_FREE 16 -#define I_FREEING 32 -#define I_CLEAR 64 -#define __I_LOCK 7 -#define I_LOCK (1 << __I_LOCK) -#define __I_SYNC 8 -#define I_SYNC (1 << __I_SYNC) - -#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); -} - -/** - * inc_nlink - directly increment an inode's link count - * @inode: inode - * - * This is a low-level filesystem helper to replace any - * direct filesystem manipulation of i_nlink. Currently, - * it is only here for parity with dec_nlink(). - */ -static inline void inc_nlink(struct inode *inode) -{ - inode->i_nlink++; -} - -static inline void inode_inc_link_count(struct inode *inode) -{ - inc_nlink(inode); - mark_inode_dirty(inode); -} - -/** - * drop_nlink - directly drop an inode's link count - * @inode: inode - * - * This is a low-level filesystem helper to replace any - * direct filesystem manipulation of i_nlink. In cases - * where we are attempting to track writes to the - * filesystem, a decrement to zero means an imminent - * write when the file is truncated and actually unlinked - * on the filesystem. - */ -static inline void drop_nlink(struct inode *inode) -{ - inode->i_nlink--; -} - -/** - * clear_nlink - directly zero an inode's link count - * @inode: inode - * - * This is a low-level filesystem helper to replace any - * direct filesystem manipulation of i_nlink. See - * drop_nlink() for why we care about i_nlink hitting zero. - */ -static inline void clear_nlink(struct inode *inode) -{ - inode->i_nlink = 0; -} - -static inline void inode_dec_link_count(struct inode *inode) -{ - drop_nlink(inode); - mark_inode_dirty(inode); -} - -/** - * inode_inc_iversion - increments i_version - * @inode: inode that need to be updated - * - * Every time the inode is modified, the i_version field will be incremented. - * The filesystem has to be mounted with i_version flag - */ - -static inline void inode_inc_iversion(struct inode *inode) -{ - spin_lock(&inode->i_lock); - inode->i_version++; - spin_unlock(&inode->i_lock); -} - -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_path.mnt, file->f_path.dentry); -} - -int sync_inode(struct inode *inode, struct writeback_control *wbc); - -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; - - struct lock_class_key i_lock_key; - struct lock_class_key i_mutex_key; - struct lock_class_key i_mutex_dir_key; - struct lock_class_key i_alloc_sem_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 *, - const struct super_operations *ops, unsigned long, - struct vfsmount *mnt); -extern int simple_set_mnt(struct vfsmount *mnt, struct super_block *sb); -int __put_super_and_need_restart(struct super_block *sb); - -/* 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_data(struct file_system_type *, void *data); -#define kern_mount(type) kern_mount_data(type, NULL) -extern int may_umount_tree(struct vfsmount *); -extern int may_umount(struct vfsmount *); -extern long do_mount(char *, char *, char *, unsigned long, void *); -extern struct vfsmount *collect_mounts(struct vfsmount *, struct dentry *); -extern void drop_collected_mounts(struct vfsmount *); - -extern int vfs_statfs(struct dentry *, struct kstatfs *); - -/* /sys/fs */ -extern struct kobject *fs_kobj; - -extern int rw_verify_area(int, struct file *, loff_t *, size_t); - -#define FLOCK_VERIFY_READ 1 -#define FLOCK_VERIFY_WRITE 2 - -#ifdef CONFIG_FILE_LOCKING -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. - */ - -static inline int __mandatory_lock(struct inode *ino) -{ - return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID; -} - -/* - * ... and these candidates should be on MS_MANDLOCK mounted fs, - * otherwise these will be advisory locks - */ - -static inline int mandatory_lock(struct inode *ino) -{ - return IS_MANDLOCK(ino) && __mandatory_lock(ino); -} - -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_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; -} -#else /* !CONFIG_FILE_LOCKING */ -#define locks_mandatory_locked(a) ({ 0; }) -#define locks_mandatory_area(a, b, c, d, e) ({ 0; }) -#define __mandatory_lock(a) ({ 0; }) -#define mandatory_lock(a) ({ 0; }) -#define locks_verify_locked(a) ({ 0; }) -#define locks_verify_truncate(a, b, c) ({ 0; }) -#define break_lease(a, b) ({ 0; }) -#endif /* CONFIG_FILE_LOCKING */ - -/* 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 dfd, 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, - const struct cred *); -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); - -extern struct kmem_cache *names_cachep; - -#define __getname() kmem_cache_alloc(names_cachep, GFP_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 - -#ifdef CONFIG_BLOCK -extern int register_blkdev(unsigned int, const char *); -extern void 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, fmode_t); -#else -static inline void bd_forget(struct inode *inode) {} -#endif -extern const struct file_operations def_blk_fops; -extern const struct file_operations def_chr_fops; -extern const struct file_operations bad_sock_fops; -extern const struct file_operations def_fifo_fops; -#ifdef CONFIG_BLOCK -extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long); -extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long); -extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long); -extern int blkdev_get(struct block_device *, fmode_t); -extern int blkdev_put(struct block_device *, fmode_t); -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 -#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 void unregister_chrdev(unsigned int, const char *); -extern void unregister_chrdev_region(dev_t, unsigned); -extern void chrdev_show(struct seq_file *,off_t); - -/* fs/block_dev.c */ -#define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ -#define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */ - -#ifdef CONFIG_BLOCK -#define BLKDEV_MAJOR_HASH_SIZE 255 -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_exclusive(const char *, fmode_t, void *); -extern void close_bdev_exclusive(struct block_device *, fmode_t); -extern void blkdev_show(struct seq_file *,off_t); - -#else -#define BLKDEV_MAJOR_HASH_SIZE 0 -#endif - -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_pipefifo_fops; -extern const struct file_operations write_pipefifo_fops; -extern const struct file_operations rdwr_pipefifo_fops; - -extern int fs_may_remount_ro(struct super_block *); - -#ifdef CONFIG_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 void check_disk_size_change(struct gendisk *disk, - struct block_device *bdev); -extern int revalidate_disk(struct gendisk *); -extern int check_disk_change(struct block_device *); -extern int __invalidate_device(struct block_device *); -extern int invalidate_partition(struct gendisk *, int); -#endif -extern int invalidate_inodes(struct super_block *); -unsigned long __invalidate_mapping_pages(struct address_space *mapping, - pgoff_t start, pgoff_t end, - bool be_atomic); -unsigned long invalidate_mapping_pages(struct address_space *mapping, - pgoff_t start, pgoff_t end); - -static inline unsigned long __deprecated -invalidate_inode_pages(struct address_space *mapping) -{ - return invalidate_mapping_pages(mapping, 0, ~0UL); -} - -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_mapping_pages(inode->i_mapping, 0, -1); -} -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 void generic_sync_sb_inodes(struct super_block *sb, - struct writeback_control *wbc); -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 int filemap_fdatawrite_range(struct address_space *mapping, - loff_t start, loff_t end); - -extern int vfs_fsync(struct file *file, struct dentry *dentry, int datasync); -extern void sync_supers(void); -extern void sync_filesystems(int wait); -extern void __fsync_super(struct super_block *sb); -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); -#ifdef CONFIG_BLOCK -extern sector_t bmap(struct inode *, sector_t); -#endif -extern int notify_change(struct dentry *, struct iattr *); -extern int inode_permission(struct inode *, int); -extern int generic_permission(struct inode *, int, - int (*check_acl)(struct inode *, int)); - -static inline bool execute_ok(struct inode *inode) -{ - return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode); -} - -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_path.dentry->d_inode->i_writecount); -} -extern int do_pipe(int *); -extern int do_pipe_flags(int *, int); -extern struct file *create_read_pipe(struct file *f, int flags); -extern struct file *create_write_pipe(int flags); -extern void free_write_pipe(struct file *); - -extern struct file *do_filp_open(int dfd, const char *pathname, - int open_flag, int mode); -extern int may_open(struct path *, 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 - -/* 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 struct inode * inode_init_always(struct super_block *, struct inode *); -extern void inode_init_once(struct inode *); -extern void inode_add_to_lists(struct super_block *, 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 int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *); -extern int insert_inode_locked(struct inode *); -extern void unlock_new_inode(struct inode *); - -extern void __iget(struct inode * inode); -extern void iget_failed(struct inode *); -extern void clear_inode(struct inode *); -extern void destroy_inode(struct inode *); -extern struct inode *new_inode(struct super_block *); -extern int should_remove_suid(struct dentry *); -extern int file_remove_suid(struct file *); - -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); -#ifdef CONFIG_BLOCK -struct bio; -extern void submit_bio(int, struct bio *); -extern int bdev_read_only(struct block_device *); -#endif -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 sb_has_dirty_inodes(struct super_block *); - -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); -int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk); -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 struct iovec *, unsigned long, 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); -extern int generic_segment_checks(const struct iovec *iov, - unsigned long *nr_segs, size_t *count, int access_flags); - -/* 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_file_splice_write_nolock(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 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 generic_file_llseek_unlocked(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 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 - -#ifdef CONFIG_BLOCK -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); -} -#endif - -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, - int nofs); -extern int page_symlink(struct inode *inode, const char *symname, int len); -extern const 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 do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd, - unsigned long arg); -extern int __generic_block_fiemap(struct inode *inode, - struct fiemap_extent_info *fieinfo, u64 start, - u64 len, get_block_t *get_block); -extern int generic_block_fiemap(struct inode *inode, - struct fiemap_extent_info *fieinfo, u64 start, - u64 len, get_block_t *get_block); - -extern void get_filesystem(struct file_system_type *fs); -extern void put_filesystem(struct file_system_type *fs); -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_write_begin(struct file *file, struct address_space *mapping, - loff_t pos, unsigned len, unsigned flags, - struct page **pagep, void **fsdata); -extern int simple_write_end(struct file *file, struct address_space *mapping, - loff_t pos, unsigned len, unsigned copied, - struct page *page, void *fsdata); - -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 const 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 *to, size_t count, - loff_t *ppos, const void *from, size_t available); - -#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); - -extern int generic_show_options(struct seq_file *m, struct vfsmount *mnt); -extern void save_mount_options(struct super_block *sb, char *options); - -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; -} - -/* 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_release, \ - .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, - int (*get)(void *, u64 *), int (*set)(void *, u64), - const char *fmt); -int simple_attr_release(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 */ - -struct ctl_table; -int proc_nr_files(struct ctl_table *table, int write, struct file *filp, - void __user *buffer, size_t *lenp, loff_t *ppos); - -int get_filesystem_list(char * buf); - -#endif /* __KERNEL__ */ -#endif /* _LINUX_FS_H */ -- cgit v1.2.3