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kernel-fxtec-pro1x/include/linux/nfs_fs.h
Trond Myklebust c42de9dd67 NFS: Fix a race in nfs_sync_inode() 
Kudos to Neil Brown for spotting the problem:

"in nfs_sync_inode, there is effectively the sequence:

   nfs_wait_on_requests
   nfs_flush_inode
   nfs_commit_inode

 This seems a bit racy to me as if the only requests are on the
 ->commit list, and nfs_commit_inode is called separately after
 nfs_wait_on_requests completes, and before nfs_commit_inode start
 (say: by nfs_write_inode) then none of these function will return
 >0, yet there will be some pending request that aren't waited for."

The solution is to search for requests to wait upon, search for dirty
requests, and search for uncommitted requests while holding the
nfsi->req_lock

The patch also cleans up nfs_sync_inode(), getting rid of the redundant
FLUSH_WAIT flag. It turns out that we were always setting it.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2006-03-20 13:44:51 -05:00

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/*
* linux/include/linux/nfs_fs.h
*
* Copyright (C) 1992 Rick Sladkey
*
* OS-specific nfs filesystem definitions and declarations
*/
#ifndef _LINUX_NFS_FS_H
#define _LINUX_NFS_FS_H
#include <linux/config.h>
#include <linux/in.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/rwsem.h>
#include <linux/wait.h>
#include <linux/nfs_fs_sb.h>
#include <linux/sunrpc/debug.h>
#include <linux/sunrpc/auth.h>
#include <linux/sunrpc/clnt.h>
#include <linux/nfs.h>
#include <linux/nfs2.h>
#include <linux/nfs3.h>
#include <linux/nfs4.h>
#include <linux/nfs_xdr.h>
#include <linux/rwsem.h>
#include <linux/mempool.h>
/*
* Enable debugging support for nfs client.
* Requires RPC_DEBUG.
*/
#ifdef RPC_DEBUG
# define NFS_DEBUG
#endif
/* Default timeout values */
#define NFS_MAX_UDP_TIMEOUT (60*HZ)
#define NFS_MAX_TCP_TIMEOUT (600*HZ)
/*
* superblock magic number for NFS
*/
#define NFS_SUPER_MAGIC 0x6969
/*
* These are the default flags for swap requests
*/
#define NFS_RPC_SWAPFLAGS (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)
/*
* When flushing a cluster of dirty pages, there can be different
* strategies:
*/
#define FLUSH_SYNC 1 /* file being synced, or contention */
#define FLUSH_STABLE 4 /* commit to stable storage */
#define FLUSH_LOWPRI 8 /* low priority background flush */
#define FLUSH_HIGHPRI 16 /* high priority memory reclaim flush */
#define FLUSH_NOCOMMIT 32 /* Don't send the NFSv3/v4 COMMIT */
#ifdef __KERNEL__
/*
* NFSv3/v4 Access mode cache entry
*/
struct nfs_access_entry {
unsigned long jiffies;
struct rpc_cred * cred;
int mask;
};
struct nfs4_state;
struct nfs_open_context {
atomic_t count;
struct vfsmount *vfsmnt;
struct dentry *dentry;
struct rpc_cred *cred;
struct nfs4_state *state;
fl_owner_t lockowner;
int mode;
int error;
struct list_head list;
__u64 dir_cookie;
};
/*
* NFSv4 delegation
*/
struct nfs_delegation;
struct posix_acl;
/*
* nfs fs inode data in memory
*/
struct nfs_inode {
/*
* The 64bit 'inode number'
*/
__u64 fileid;
/*
* NFS file handle
*/
struct nfs_fh fh;
/*
* Various flags
*/
unsigned long flags; /* atomic bit ops */
unsigned long cache_validity; /* bit mask */
/*
* read_cache_jiffies is when we started read-caching this inode.
* attrtimeo is for how long the cached information is assumed
* to be valid. A successful attribute revalidation doubles
* attrtimeo (up to acregmax/acdirmax), a failure resets it to
* acregmin/acdirmin.
*
* We need to revalidate the cached attrs for this inode if
*
* jiffies - read_cache_jiffies > attrtimeo
*/
unsigned long read_cache_jiffies;
unsigned long attrtimeo;
unsigned long attrtimeo_timestamp;
__u64 change_attr; /* v4 only */
unsigned long last_updated;
/* "Generation counter" for the attribute cache. This is
* bumped whenever we update the metadata on the
* server.
*/
unsigned long cache_change_attribute;
/*
* Counter indicating the number of outstanding requests that
* will cause a file data update.
*/
atomic_t data_updates;
struct nfs_access_entry cache_access;
#ifdef CONFIG_NFS_V3_ACL
struct posix_acl *acl_access;
struct posix_acl *acl_default;
#endif
/*
* This is the cookie verifier used for NFSv3 readdir
* operations
*/
__u32 cookieverf[2];
/*
* This is the list of dirty unwritten pages.
*/
spinlock_t req_lock;
struct list_head dirty;
struct list_head commit;
struct radix_tree_root nfs_page_tree;
unsigned int ndirty,
ncommit,
npages;
/* Open contexts for shared mmap writes */
struct list_head open_files;
#ifdef CONFIG_NFS_V4
struct nfs4_cached_acl *nfs4_acl;
/* NFSv4 state */
struct list_head open_states;
struct nfs_delegation *delegation;
int delegation_state;
struct rw_semaphore rwsem;
#endif /* CONFIG_NFS_V4*/
struct inode vfs_inode;
};
/*
* Cache validity bit flags
*/
#define NFS_INO_INVALID_ATTR 0x0001 /* cached attrs are invalid */
#define NFS_INO_INVALID_DATA 0x0002 /* cached data is invalid */
#define NFS_INO_INVALID_ATIME 0x0004 /* cached atime is invalid */
#define NFS_INO_INVALID_ACCESS 0x0008 /* cached access cred invalid */
#define NFS_INO_INVALID_ACL 0x0010 /* cached acls are invalid */
#define NFS_INO_REVAL_PAGECACHE 0x0020 /* must revalidate pagecache */
/*
* Bit offsets in flags field
*/
#define NFS_INO_REVALIDATING (0) /* revalidating attrs */
#define NFS_INO_ADVISE_RDPLUS (1) /* advise readdirplus */
#define NFS_INO_STALE (2) /* possible stale inode */
static inline struct nfs_inode *NFS_I(struct inode *inode)
{
return container_of(inode, struct nfs_inode, vfs_inode);
}
#define NFS_SB(s) ((struct nfs_server *)(s->s_fs_info))
#define NFS_FH(inode) (&NFS_I(inode)->fh)
#define NFS_SERVER(inode) (NFS_SB(inode->i_sb))
#define NFS_CLIENT(inode) (NFS_SERVER(inode)->client)
#define NFS_PROTO(inode) (NFS_SERVER(inode)->rpc_ops)
#define NFS_ADDR(inode) (RPC_PEERADDR(NFS_CLIENT(inode)))
#define NFS_COOKIEVERF(inode) (NFS_I(inode)->cookieverf)
#define NFS_READTIME(inode) (NFS_I(inode)->read_cache_jiffies)
#define NFS_CHANGE_ATTR(inode) (NFS_I(inode)->change_attr)
#define NFS_ATTRTIMEO(inode) (NFS_I(inode)->attrtimeo)
#define NFS_MINATTRTIMEO(inode) \
(S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmin \
: NFS_SERVER(inode)->acregmin)
#define NFS_MAXATTRTIMEO(inode) \
(S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmax \
: NFS_SERVER(inode)->acregmax)
#define NFS_ATTRTIMEO_UPDATE(inode) (NFS_I(inode)->attrtimeo_timestamp)
#define NFS_FLAGS(inode) (NFS_I(inode)->flags)
#define NFS_STALE(inode) (test_bit(NFS_INO_STALE, &NFS_FLAGS(inode)))
#define NFS_FILEID(inode) (NFS_I(inode)->fileid)
static inline int nfs_caches_unstable(struct inode *inode)
{
return atomic_read(&NFS_I(inode)->data_updates) != 0;
}
static inline void nfs_mark_for_revalidate(struct inode *inode)
{
spin_lock(&inode->i_lock);
NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS;
spin_unlock(&inode->i_lock);
}
static inline void NFS_CACHEINV(struct inode *inode)
{
if (!nfs_caches_unstable(inode))
nfs_mark_for_revalidate(inode);
}
static inline int nfs_server_capable(struct inode *inode, int cap)
{
return NFS_SERVER(inode)->caps & cap;
}
static inline int NFS_USE_READDIRPLUS(struct inode *inode)
{
return test_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode));
}
/**
* nfs_save_change_attribute - Returns the inode attribute change cookie
* @inode - pointer to inode
* The "change attribute" is updated every time we finish an operation
* that will result in a metadata change on the server.
*/
static inline long nfs_save_change_attribute(struct inode *inode)
{
return NFS_I(inode)->cache_change_attribute;
}
/**
* nfs_verify_change_attribute - Detects NFS inode cache updates
* @inode - pointer to inode
* @chattr - previously saved change attribute
* Return "false" if metadata has been updated (or is in the process of
* being updated) since the change attribute was saved.
*/
static inline int nfs_verify_change_attribute(struct inode *inode, unsigned long chattr)
{
return !nfs_caches_unstable(inode)
&& time_after_eq(chattr, NFS_I(inode)->cache_change_attribute);
}
/*
* linux/fs/nfs/inode.c
*/
extern int nfs_sync_mapping(struct address_space *mapping);
extern void nfs_zap_caches(struct inode *);
extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
struct nfs_fattr *);
extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
extern int nfs_permission(struct inode *, int, struct nameidata *);
extern int nfs_access_get_cached(struct inode *, struct rpc_cred *, struct nfs_access_entry *);
extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *);
extern int nfs_open(struct inode *, struct file *);
extern int nfs_release(struct inode *, struct file *);
extern int nfs_attribute_timeout(struct inode *inode);
extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
extern void nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
extern int nfs_setattr(struct dentry *, struct iattr *);
extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr);
extern void nfs_begin_attr_update(struct inode *);
extern void nfs_end_attr_update(struct inode *);
extern void nfs_begin_data_update(struct inode *);
extern void nfs_end_data_update(struct inode *);
extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
extern void put_nfs_open_context(struct nfs_open_context *ctx);
extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode);
/* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
extern u32 root_nfs_parse_addr(char *name); /*__init*/
static inline void nfs_fattr_init(struct nfs_fattr *fattr)
{
fattr->valid = 0;
fattr->time_start = jiffies;
}
/*
* linux/fs/nfs/file.c
*/
extern struct inode_operations nfs_file_inode_operations;
#ifdef CONFIG_NFS_V3
extern struct inode_operations nfs3_file_inode_operations;
#endif /* CONFIG_NFS_V3 */
extern struct file_operations nfs_file_operations;
extern struct address_space_operations nfs_file_aops;
static inline struct rpc_cred *nfs_file_cred(struct file *file)
{
if (file != NULL) {
struct nfs_open_context *ctx;
ctx = (struct nfs_open_context*)file->private_data;
return ctx->cred;
}
return NULL;
}
/*
* linux/fs/nfs/xattr.c
*/
#ifdef CONFIG_NFS_V3_ACL
extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t);
extern ssize_t nfs3_getxattr(struct dentry *, const char *, void *, size_t);
extern int nfs3_setxattr(struct dentry *, const char *,
const void *, size_t, int);
extern int nfs3_removexattr (struct dentry *, const char *name);
#else
# define nfs3_listxattr NULL
# define nfs3_getxattr NULL
# define nfs3_setxattr NULL
# define nfs3_removexattr NULL
#endif
/*
* linux/fs/nfs/direct.c
*/
extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
unsigned long);
extern ssize_t nfs_file_direct_read(struct kiocb *iocb, char __user *buf,
size_t count, loff_t pos);
extern ssize_t nfs_file_direct_write(struct kiocb *iocb, const char __user *buf,
size_t count, loff_t pos);
/*
* linux/fs/nfs/dir.c
*/
extern struct inode_operations nfs_dir_inode_operations;
#ifdef CONFIG_NFS_V3
extern struct inode_operations nfs3_dir_inode_operations;
#endif /* CONFIG_NFS_V3 */
extern struct file_operations nfs_dir_operations;
extern struct dentry_operations nfs_dentry_operations;
extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);
/*
* linux/fs/nfs/symlink.c
*/
extern struct inode_operations nfs_symlink_inode_operations;
/*
* linux/fs/nfs/sysctl.c
*/
#ifdef CONFIG_SYSCTL
extern int nfs_register_sysctl(void);
extern void nfs_unregister_sysctl(void);
#else
#define nfs_register_sysctl() 0
#define nfs_unregister_sysctl() do { } while(0)
#endif
/*
* linux/fs/nfs/unlink.c
*/
extern int nfs_async_unlink(struct dentry *);
extern void nfs_complete_unlink(struct dentry *);
/*
* linux/fs/nfs/write.c
*/
extern int nfs_writepage(struct page *page, struct writeback_control *wbc);
extern int nfs_writepages(struct address_space *, struct writeback_control *);
extern int nfs_flush_incompatible(struct file *file, struct page *page);
extern int nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
extern int nfs_writeback_done(struct rpc_task *, struct nfs_write_data *);
extern void nfs_writedata_release(void *);
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
struct nfs_write_data *nfs_commit_alloc(unsigned int pagecount);
void nfs_commit_free(struct nfs_write_data *p);
#endif
/*
* Try to write back everything synchronously (but check the
* return value!)
*/
extern int nfs_sync_inode_wait(struct inode *, unsigned long, unsigned int, int);
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
extern int nfs_commit_inode(struct inode *, int);
extern void nfs_commit_release(void *wdata);
#else
static inline int
nfs_commit_inode(struct inode *inode, int how)
{
return 0;
}
#endif
static inline int
nfs_have_writebacks(struct inode *inode)
{
return NFS_I(inode)->npages != 0;
}
static inline int
nfs_wb_all(struct inode *inode)
{
int error = nfs_sync_inode_wait(inode, 0, 0, 0);
return (error < 0) ? error : 0;
}
/*
* Write back all requests on one page - we do this before reading it.
*/
static inline int nfs_wb_page_priority(struct inode *inode, struct page* page, int how)
{
int error = nfs_sync_inode_wait(inode, page->index, 1,
how | FLUSH_STABLE);
return (error < 0) ? error : 0;
}
static inline int nfs_wb_page(struct inode *inode, struct page* page)
{
return nfs_wb_page_priority(inode, page, 0);
}
/*
* Allocate and free nfs_write_data structures
*/
extern struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount);
extern void nfs_writedata_free(struct nfs_write_data *p);
/*
* linux/fs/nfs/read.c
*/
extern int nfs_readpage(struct file *, struct page *);
extern int nfs_readpages(struct file *, struct address_space *,
struct list_head *, unsigned);
extern int nfs_readpage_result(struct rpc_task *, struct nfs_read_data *);
extern void nfs_readdata_release(void *data);
/*
* Allocate and free nfs_read_data structures
*/
extern struct nfs_read_data *nfs_readdata_alloc(unsigned int pagecount);
extern void nfs_readdata_free(struct nfs_read_data *p);
/*
* linux/fs/nfs3proc.c
*/
#ifdef CONFIG_NFS_V3_ACL
extern struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type);
extern int nfs3_proc_setacl(struct inode *inode, int type,
struct posix_acl *acl);
extern int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
mode_t mode);
extern void nfs3_forget_cached_acls(struct inode *inode);
#else
static inline int nfs3_proc_set_default_acl(struct inode *dir,
struct inode *inode,
mode_t mode)
{
return 0;
}
static inline void nfs3_forget_cached_acls(struct inode *inode)
{
}
#endif /* CONFIG_NFS_V3_ACL */
/*
* linux/fs/mount_clnt.c
* (Used only by nfsroot module)
*/
extern int nfsroot_mount(struct sockaddr_in *, char *, struct nfs_fh *,
int, int);
/*
* inline functions
*/
static inline loff_t
nfs_size_to_loff_t(__u64 size)
{
loff_t maxsz = (((loff_t) ULONG_MAX) << PAGE_CACHE_SHIFT) + PAGE_CACHE_SIZE - 1;
if (size > maxsz)
return maxsz;
return (loff_t) size;
}
static inline ino_t
nfs_fileid_to_ino_t(u64 fileid)
{
ino_t ino = (ino_t) fileid;
if (sizeof(ino_t) < sizeof(u64))
ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
return ino;
}
/* NFS root */
extern void * nfs_root_data(void);
#define nfs_wait_event(clnt, wq, condition) \
({ \
int __retval = 0; \
if (clnt->cl_intr) { \
sigset_t oldmask; \
rpc_clnt_sigmask(clnt, &oldmask); \
__retval = wait_event_interruptible(wq, condition); \
rpc_clnt_sigunmask(clnt, &oldmask); \
} else \
wait_event(wq, condition); \
__retval; \
})
#define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
#endif /* __KERNEL__ */
/*
* NFS debug flags
*/
#define NFSDBG_VFS 0x0001
#define NFSDBG_DIRCACHE 0x0002
#define NFSDBG_LOOKUPCACHE 0x0004
#define NFSDBG_PAGECACHE 0x0008
#define NFSDBG_PROC 0x0010
#define NFSDBG_XDR 0x0020
#define NFSDBG_FILE 0x0040
#define NFSDBG_ROOT 0x0080
#define NFSDBG_CALLBACK 0x0100
#define NFSDBG_ALL 0xFFFF
#ifdef __KERNEL__
# undef ifdebug
# ifdef NFS_DEBUG
# define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac))
# else
# define ifdebug(fac) if (0)
# endif
#endif /* __KERNEL */
#endif
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