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-rw-r--r--include/linux/fs.h204
1 files changed, 177 insertions, 27 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 17fd887c798..aa110476a95 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -165,6 +165,8 @@ struct inodes_stat_t {
#define READ 0
#define WRITE RW_MASK
#define READA RWA_MASK
+#define KERNEL_READ (READ|REQ_KERNEL)
+#define KERNEL_WRITE (WRITE|REQ_KERNEL)
#define READ_SYNC (READ | REQ_SYNC)
#define WRITE_SYNC (WRITE | REQ_SYNC | REQ_NOIDLE)
@@ -412,6 +414,7 @@ struct inodes_stat_t {
#include <linux/shrinker.h>
#include <linux/migrate_mode.h>
#include <linux/uidgid.h>
+#include <linux/lockdep.h>
#include <asm/byteorder.h>
@@ -427,6 +430,7 @@ struct kstatfs;
struct vm_area_struct;
struct vfsmount;
struct cred;
+struct swap_info_struct;
extern void __init inode_init(void);
extern void __init inode_init_early(void);
@@ -437,6 +441,8 @@ extern unsigned long get_max_files(void);
extern int sysctl_nr_open;
extern struct inodes_stat_t inodes_stat;
extern int leases_enable, lease_break_time;
+extern int sysctl_protected_symlinks;
+extern int sysctl_protected_hardlinks;
struct buffer_head;
typedef int (get_block_t)(struct inode *inode, sector_t iblock,
@@ -636,6 +642,11 @@ struct address_space_operations {
int (*is_partially_uptodate) (struct page *, read_descriptor_t *,
unsigned long);
int (*error_remove_page)(struct address_space *, struct page *);
+
+ /* swapfile support */
+ int (*swap_activate)(struct swap_info_struct *sis, struct file *file,
+ sector_t *span);
+ void (*swap_deactivate)(struct file *file);
};
extern const struct address_space_operations empty_aops;
@@ -826,7 +837,7 @@ struct inode {
struct list_head i_lru; /* inode LRU list */
struct list_head i_sb_list;
union {
- struct list_head i_dentry;
+ struct hlist_head i_dentry;
struct rcu_head i_rcu;
};
u64 i_version;
@@ -1154,7 +1165,6 @@ struct lock_manager_operations {
int (*lm_compare_owner)(struct file_lock *, struct file_lock *);
void (*lm_notify)(struct file_lock *); /* unblock callback */
int (*lm_grant)(struct file_lock *, struct file_lock *, int);
- void (*lm_release_private)(struct file_lock *);
void (*lm_break)(struct file_lock *);
int (*lm_change)(struct file_lock **, int);
};
@@ -1163,9 +1173,10 @@ struct lock_manager {
struct list_head list;
};
-void locks_start_grace(struct lock_manager *);
+struct net;
+void locks_start_grace(struct net *, struct lock_manager *);
void locks_end_grace(struct lock_manager *);
-int locks_in_grace(void);
+int locks_in_grace(struct net *);
/* that will die - we need it for nfs_lock_info */
#include <linux/nfs_fs_i.h>
@@ -1437,6 +1448,8 @@ extern void f_delown(struct file *filp);
extern pid_t f_getown(struct file *filp);
extern int send_sigurg(struct fown_struct *fown);
+struct mm_struct;
+
/*
* Umount options
*/
@@ -1450,10 +1463,34 @@ extern int send_sigurg(struct fown_struct *fown);
extern struct list_head super_blocks;
extern spinlock_t sb_lock;
+/* Possible states of 'frozen' field */
+enum {
+ SB_UNFROZEN = 0, /* FS is unfrozen */
+ SB_FREEZE_WRITE = 1, /* Writes, dir ops, ioctls frozen */
+ SB_FREEZE_PAGEFAULT = 2, /* Page faults stopped as well */
+ SB_FREEZE_FS = 3, /* For internal FS use (e.g. to stop
+ * internal threads if needed) */
+ SB_FREEZE_COMPLETE = 4, /* ->freeze_fs finished successfully */
+};
+
+#define SB_FREEZE_LEVELS (SB_FREEZE_COMPLETE - 1)
+
+struct sb_writers {
+ /* Counters for counting writers at each level */
+ struct percpu_counter counter[SB_FREEZE_LEVELS];
+ wait_queue_head_t wait; /* queue for waiting for
+ writers / faults to finish */
+ int frozen; /* Is sb frozen? */
+ wait_queue_head_t wait_unfrozen; /* queue for waiting for
+ sb to be thawed */
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+ struct lockdep_map lock_map[SB_FREEZE_LEVELS];
+#endif
+};
+
struct super_block {
struct list_head s_list; /* Keep this first */
dev_t s_dev; /* search index; _not_ kdev_t */
- unsigned char s_dirt;
unsigned char s_blocksize_bits;
unsigned long s_blocksize;
loff_t s_maxbytes; /* Max file size */
@@ -1497,8 +1534,7 @@ struct super_block {
struct hlist_node s_instances;
struct quota_info s_dquot; /* Diskquota specific options */
- int s_frozen;
- wait_queue_head_t s_wait_unfrozen;
+ struct sb_writers s_writers;
char s_id[32]; /* Informational name */
u8 s_uuid[16]; /* UUID */
@@ -1553,14 +1589,117 @@ 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)))
+void __sb_end_write(struct super_block *sb, int level);
+int __sb_start_write(struct super_block *sb, int level, bool wait);
+
+/**
+ * sb_end_write - drop write access to a superblock
+ * @sb: the super we wrote to
+ *
+ * Decrement number of writers to the filesystem. Wake up possible waiters
+ * wanting to freeze the filesystem.
+ */
+static inline void sb_end_write(struct super_block *sb)
+{
+ __sb_end_write(sb, SB_FREEZE_WRITE);
+}
+
+/**
+ * sb_end_pagefault - drop write access to a superblock from a page fault
+ * @sb: the super we wrote to
+ *
+ * Decrement number of processes handling write page fault to the filesystem.
+ * Wake up possible waiters wanting to freeze the filesystem.
+ */
+static inline void sb_end_pagefault(struct super_block *sb)
+{
+ __sb_end_write(sb, SB_FREEZE_PAGEFAULT);
+}
+
+/**
+ * sb_end_intwrite - drop write access to a superblock for internal fs purposes
+ * @sb: the super we wrote to
+ *
+ * Decrement fs-internal number of writers to the filesystem. Wake up possible
+ * waiters wanting to freeze the filesystem.
+ */
+static inline void sb_end_intwrite(struct super_block *sb)
+{
+ __sb_end_write(sb, SB_FREEZE_FS);
+}
+
+/**
+ * sb_start_write - get write access to a superblock
+ * @sb: the super we write to
+ *
+ * When a process wants to write data or metadata to a file system (i.e. dirty
+ * a page or an inode), it should embed the operation in a sb_start_write() -
+ * sb_end_write() pair to get exclusion against file system freezing. This
+ * function increments number of writers preventing freezing. If the file
+ * system is already frozen, the function waits until the file system is
+ * thawed.
+ *
+ * Since freeze protection behaves as a lock, users have to preserve
+ * ordering of freeze protection and other filesystem locks. Generally,
+ * freeze protection should be the outermost lock. In particular, we have:
+ *
+ * sb_start_write
+ * -> i_mutex (write path, truncate, directory ops, ...)
+ * -> s_umount (freeze_super, thaw_super)
+ */
+static inline void sb_start_write(struct super_block *sb)
+{
+ __sb_start_write(sb, SB_FREEZE_WRITE, true);
+}
+
+static inline int sb_start_write_trylock(struct super_block *sb)
+{
+ return __sb_start_write(sb, SB_FREEZE_WRITE, false);
+}
+
+/**
+ * sb_start_pagefault - get write access to a superblock from a page fault
+ * @sb: the super we write to
+ *
+ * When a process starts handling write page fault, it should embed the
+ * operation into sb_start_pagefault() - sb_end_pagefault() pair to get
+ * exclusion against file system freezing. This is needed since the page fault
+ * is going to dirty a page. This function increments number of running page
+ * faults preventing freezing. If the file system is already frozen, the
+ * function waits until the file system is thawed.
+ *
+ * Since page fault freeze protection behaves as a lock, users have to preserve
+ * ordering of freeze protection and other filesystem locks. It is advised to
+ * put sb_start_pagefault() close to mmap_sem in lock ordering. Page fault
+ * handling code implies lock dependency:
+ *
+ * mmap_sem
+ * -> sb_start_pagefault
+ */
+static inline void sb_start_pagefault(struct super_block *sb)
+{
+ __sb_start_write(sb, SB_FREEZE_PAGEFAULT, true);
+}
+
+/*
+ * sb_start_intwrite - get write access to a superblock for internal fs purposes
+ * @sb: the super we write to
+ *
+ * This is the third level of protection against filesystem freezing. It is
+ * free for use by a filesystem. The only requirement is that it must rank
+ * below sb_start_pagefault.
+ *
+ * For example filesystem can call sb_start_intwrite() when starting a
+ * transaction which somewhat eases handling of freezing for internal sources
+ * of filesystem changes (internal fs threads, discarding preallocation on file
+ * close, etc.).
+ */
+static inline void sb_start_intwrite(struct super_block *sb)
+{
+ __sb_start_write(sb, SB_FREEZE_FS, true);
+}
+
extern bool inode_owner_or_capable(const struct inode *inode);
@@ -1571,7 +1710,7 @@ extern void unlock_super(struct super_block *);
/*
* VFS helper functions..
*/
-extern int vfs_create(struct inode *, struct dentry *, umode_t, struct nameidata *);
+extern int vfs_create(struct inode *, struct dentry *, umode_t, bool);
extern int vfs_mkdir(struct inode *, struct dentry *, umode_t);
extern int vfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
extern int vfs_symlink(struct inode *, struct dentry *, const char *);
@@ -1666,7 +1805,7 @@ struct file_operations {
};
struct inode_operations {
- struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *);
+ struct dentry * (*lookup) (struct inode *,struct dentry *, unsigned int);
void * (*follow_link) (struct dentry *, struct nameidata *);
int (*permission) (struct inode *, int);
struct posix_acl * (*get_acl)(struct inode *, int);
@@ -1674,7 +1813,7 @@ struct inode_operations {
int (*readlink) (struct dentry *, char __user *,int);
void (*put_link) (struct dentry *, struct nameidata *, void *);
- int (*create) (struct inode *,struct dentry *,umode_t,struct nameidata *);
+ int (*create) (struct inode *,struct dentry *, umode_t, bool);
int (*link) (struct dentry *,struct inode *,struct dentry *);
int (*unlink) (struct inode *,struct dentry *);
int (*symlink) (struct inode *,struct dentry *,const char *);
@@ -1693,6 +1832,9 @@ struct inode_operations {
int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start,
u64 len);
int (*update_time)(struct inode *, struct timespec *, int);
+ int (*atomic_open)(struct inode *, struct dentry *,
+ struct file *, unsigned open_flag,
+ umode_t create_mode, int *opened);
} ____cacheline_aligned;
struct seq_file;
@@ -1718,7 +1860,6 @@ struct super_operations {
int (*drop_inode) (struct inode *);
void (*evict_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 *);
@@ -1881,6 +2022,7 @@ struct file_system_type {
struct lock_class_key s_lock_key;
struct lock_class_key s_umount_key;
struct lock_class_key s_vfs_rename_key;
+ struct lock_class_key s_writers_key[SB_FREEZE_LEVELS];
struct lock_class_key i_lock_key;
struct lock_class_key i_mutex_key;
@@ -1911,7 +2053,7 @@ void free_anon_bdev(dev_t);
struct super_block *sget(struct file_system_type *type,
int (*test)(struct super_block *,void *),
int (*set)(struct super_block *,void *),
- void *data);
+ int flags, void *data);
extern struct dentry *mount_pseudo(struct file_system_type *, char *,
const struct super_operations *ops,
const struct dentry_operations *dops,
@@ -2057,10 +2199,17 @@ extern long do_sys_open(int dfd, const char __user *filename, int flags,
extern struct file *filp_open(const char *, int, umode_t);
extern struct file *file_open_root(struct dentry *, struct vfsmount *,
const char *, int);
-extern struct file * dentry_open(struct dentry *, struct vfsmount *, int,
- const struct cred *);
+extern struct file * dentry_open(const struct path *, int, const struct cred *);
extern int filp_close(struct file *, fl_owner_t id);
extern char * getname(const char __user *);
+enum {
+ FILE_CREATED = 1,
+ FILE_OPENED = 2
+};
+extern int finish_open(struct file *file, struct dentry *dentry,
+ int (*open)(struct inode *, struct file *),
+ int *opened);
+extern int finish_no_open(struct file *file, struct dentry *dentry);
/* fs/ioctl.c */
@@ -2091,6 +2240,7 @@ extern sector_t blkdev_max_block(struct block_device *bdev);
extern void bd_forget(struct inode *inode);
extern void bdput(struct block_device *);
extern void invalidate_bdev(struct block_device *);
+extern void iterate_bdevs(void (*)(struct block_device *, void *), void *);
extern int sync_blockdev(struct block_device *bdev);
extern void kill_bdev(struct block_device *);
extern struct super_block *freeze_bdev(struct block_device *);
@@ -2112,6 +2262,10 @@ static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb)
{
return 0;
}
+
+static inline void iterate_bdevs(void (*f)(struct block_device *, void *), void *arg)
+{
+}
#endif
extern int sync_filesystem(struct super_block *);
extern const struct file_operations def_blk_fops;
@@ -2241,7 +2395,6 @@ extern int vfs_fsync_range(struct file *file, loff_t start, loff_t end,
int datasync);
extern int vfs_fsync(struct file *file, int datasync);
extern int generic_write_sync(struct file *file, loff_t pos, loff_t count);
-extern void sync_supers(void);
extern void emergency_sync(void);
extern void emergency_remount(void);
#ifdef CONFIG_BLOCK
@@ -2311,9 +2464,6 @@ static inline void i_readcount_inc(struct inode *inode)
}
#endif
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 int kernel_read(struct file *, loff_t, char *, unsigned long);
extern struct file * open_exec(const char *);
@@ -2438,7 +2588,7 @@ extern loff_t noop_llseek(struct file *file, loff_t offset, int origin);
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_size(struct file *file, loff_t offset,
- int origin, loff_t maxsize);
+ int origin, loff_t maxsize, loff_t eof);
extern int generic_file_open(struct inode * inode, struct file * filp);
extern int nonseekable_open(struct inode * inode, struct file * filp);
@@ -2560,7 +2710,7 @@ 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 struct dentry *simple_lookup(struct inode *, struct dentry *, unsigned int flags);
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;