#define MS_SLAVE (1<<19) /* change to slave */
#define MS_SHARED (1<<20) /* change to shared */
#define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
+#define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */
#define MS_ACTIVE (1<<30)
#define MS_NOUSER (1<<31)
#include <linux/init.h>
#include <linux/pid.h>
#include <linux/mutex.h>
-#include <linux/sysctl.h>
#include <linux/capability.h>
#include <asm/atomic.h>
struct vm_area_struct;
struct vfsmount;
-extern void __init inode_init(unsigned long);
+extern void __init inode_init(void);
extern void __init inode_init_early(void);
-extern void __init mnt_init(unsigned long);
+extern void __init mnt_init(void);
extern void __init files_init(unsigned long);
struct buffer_head;
#define ATTR_KILL_SUID 2048
#define ATTR_KILL_SGID 4096
#define ATTR_FILE 8192
+#define ATTR_KILL_PRIV 16384
+#define ATTR_OPEN 32768 /* Truncating from open(O_TRUNC) */
/*
* This is the Inode Attributes structure, used for notify_change(). It
* 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().
+ * 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
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 */
+
/*
* oh the beauties of C type declarations.
*/
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;
+}
+
+
struct address_space_operations {
int (*writepage)(struct page *page, struct writeback_control *wbc);
int (*readpage)(struct file *, struct page *);
*/
int (*prepare_write)(struct file *, struct page *, unsigned, unsigned);
int (*commit_write)(struct file *, struct page *, unsigned, unsigned);
+
+ 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 (*launder_page) (struct page *);
};
+/*
+ * 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 */
* 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_index; /* 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 */
- unsigned int prev_offset; /* Offset where last read() ended in a page */
+ 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 */
};
-#define RA_FLAG_MISS 0x01 /* a cache miss occured against this file */
-#define RA_FLAG_INCACHE 0x02 /* file is already in cache */
+
+/*
+ * 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);
+}
struct file {
/*
unsigned int f_uid, f_gid;
struct file_ra_state f_ra;
- unsigned long f_version;
+ u64 f_version;
#ifdef CONFIG_SECURITY
void *f_security;
#endif
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 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);
+extern struct seq_operations locks_seq_operations;
struct fasync_struct {
int magic;
const struct super_operations *s_op;
struct dquot_operations *dq_op;
struct quotactl_ops *s_qcop;
- struct export_operations *s_export_op;
+ const struct export_operations *s_export_op;
unsigned long s_flags;
unsigned long s_magic;
struct dentry *s_root;
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;
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);
};
struct seq_file;
#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
+/*
+ * 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 itself is dirty.
+ * I_DIRTY_DATASYNC Data-related inode changes pending
+ * 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 seperate lock for this
+ * purpose reduces latency and prevents some filesystem-
+ * specific deadlocks.
+ *
+ * Q: Why does I_DIRTY_DATASYNC exist? It appears as if it could be replaced
+ * by (I_DIRTY_SYNC|I_DIRTY_PAGES).
+ * 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_FREEING 16
-#define I_CLEAR 32
-#define I_NEW 64
-#define I_WILL_FREE 128
+#define __I_SYNC 8
+#define I_SYNC (1 << __I_SYNC)
#define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
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,
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 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 void umount_tree(struct vfsmount *, int, struct list_head *);
extern struct vfsmount *copy_tree(struct vfsmount *, struct dentry *, int);
extern void mnt_set_mountpoint(struct vfsmount *, struct dentry *,
struct vfsmount *);
+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 kset fs_subsys;
+extern struct kobject *fs_kobj;
#define FLOCK_VERIFY_READ 1
#define FLOCK_VERIFY_WRITE 2
* 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 __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))
+ if (mandatory_lock(inode))
return locks_mandatory_locked(inode);
return 0;
}
struct file *filp,
loff_t size)
{
- if (inode->i_flock && MANDATORY_LOCK(inode))
+ if (inode->i_flock && mandatory_lock(inode))
return locks_mandatory_area(
FLOCK_VERIFY_WRITE, inode, filp,
size < inode->i_size ? size : inode->i_size,
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,
+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);
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(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);
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);
-extern int file_send_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 int vfs_ioctl(struct file *, unsigned int, unsigned int, unsigned long);
+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 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 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 *);
{ }
#endif /* CONFIG_SECURITY */
-int proc_nr_files(ctl_table *table, int write, struct file *filp,
+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);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff