1 files changed, 129 insertions, 113 deletions

diff --git a/fs/nfsd/nfsfh.h b/fs/nfsd/nfsfh.h
index 755e256a9103..5ef7191f8ad8 100644
--- a/fs/nfsd/nfsfh.h
+++ b/fs/nfsd/nfsfh.h
@@ -10,8 +10,59 @@
 
 #include <linux/crc32.h>
 #include <linux/sunrpc/svc.h>
-#include <uapi/linux/nfsd/nfsfh.h>
 #include <linux/iversion.h>
+#include <linux/exportfs.h>
+#include <linux/nfs4.h>
+
+#include "export.h"
+
+/*
+ * The file handle starts with a sequence of four-byte words.
+ * The first word contains a version number (1) and three descriptor bytes
+ * that tell how the remaining 3 variable length fields should be handled.
+ * These three bytes are auth_type, fsid_type and fileid_type.
+ *
+ * All four-byte values are in host-byte-order.
+ *
+ * The auth_type field is deprecated and must be set to 0.
+ *
+ * The fsid_type identifies how the filesystem (or export point) is
+ *    encoded.
+ *  Current values:
+ *     0  - 4 byte device id (ms-2-bytes major, ls-2-bytes minor), 4byte inode number
+ *        NOTE: we cannot use the kdev_t device id value, because kdev_t.h
+ *              says we mustn't.  We must break it up and reassemble.
+ *     1  - 4 byte user specified identifier
+ *     2  - 4 byte major, 4 byte minor, 4 byte inode number - DEPRECATED
+ *     3  - 4 byte device id, encoded for user-space, 4 byte inode number
+ *     4  - 4 byte inode number and 4 byte uuid
+ *     5  - 8 byte uuid
+ *     6  - 16 byte uuid
+ *     7  - 8 byte inode number and 16 byte uuid
+ *
+ * The fileid_type identifies how the file within the filesystem is encoded.
+ *   The values for this field are filesystem specific, exccept that
+ *   filesystems must not use the values '0' or '0xff'. 'See enum fid_type'
+ *   in include/linux/exportfs.h for currently registered values.
+ */
+
+struct knfsd_fh {
+	unsigned int	fh_size;	/*
+					 * Points to the current size while
+					 * building a new file handle.
+					 */
+	u8		fh_raw[NFS4_FHSIZE];
+};
+
+#define fh_version		fh_raw[0]
+#define fh_auth_type		fh_raw[1]
+#define fh_fsid_type		fh_raw[2]
+#define fh_fileid_type		fh_raw[3]
+
+static inline u32 *fh_fsid(const struct knfsd_fh *fh)
+{
+	return (u32 *)&fh->fh_raw[4];
+}
 
 static inline __u32 ino_t_to_u32(ino_t ino)
 {
@@ -33,29 +84,36 @@ typedef struct svc_fh {
 	struct dentry *		fh_dentry;	/* validated dentry */
 	struct svc_export *	fh_export;	/* export pointer */
 
-	bool			fh_locked;	/* inode locked by us */
 	bool			fh_want_write;	/* remount protection taken */
-
-#ifdef CONFIG_NFSD_V3
+	bool			fh_no_wcc;	/* no wcc data needed */
+	bool			fh_no_atomic_attr;
+						/*
+						 * wcc data is not atomic with
+						 * operation
+						 */
+	bool			fh_use_wgather;	/* NFSv2 wgather option */
+	bool			fh_64bit_cookies;/* readdir cookie size */
+	int			fh_flags;	/* FH flags */
 	bool			fh_post_saved;	/* post-op attrs saved */
 	bool			fh_pre_saved;	/* pre-op attrs saved */
 
-	/* Pre-op attributes saved during fh_lock */
+	/* Pre-op attributes saved when inode is locked */
 	__u64			fh_pre_size;	/* size before operation */
-	struct timespec		fh_pre_mtime;	/* mtime before oper */
-	struct timespec		fh_pre_ctime;	/* ctime before oper */
+	struct timespec64	fh_pre_mtime;	/* mtime before oper */
+	struct timespec64	fh_pre_ctime;	/* ctime before oper */
 	/*
 	 * pre-op nfsv4 change attr: note must check IS_I_VERSION(inode)
 	 *  to find out if it is valid.
 	 */
 	u64			fh_pre_change;
 
-	/* Post-op attributes saved in fh_unlock */
+	/* Post-op attributes saved in fh_fill_post_attrs() */
 	struct kstat		fh_post_attr;	/* full attrs after operation */
 	u64			fh_post_change; /* nfsv4 change; see above */
-#endif /* CONFIG_NFSD_V3 */
-
 } svc_fh;
+#define NFSD4_FH_FOREIGN (1<<0)
+#define SET_FH_FLAG(c, f) ((c)->fh_flags |= (f))
+#define HAS_FH_FLAG(c, f) ((c)->fh_flags & (f))
 
 enum nfsd_fsid {
 	FSID_DEV = 0,
@@ -73,7 +131,7 @@ enum fsid_source {
 	FSIDSOURCE_FSID,
 	FSIDSOURCE_UUID,
 };
-extern enum fsid_source fsid_source(struct svc_fh *fhp);
+extern enum fsid_source fsid_source(const struct svc_fh *fhp);
 
 
 /*
@@ -162,24 +220,27 @@ extern char * SVCFH_fmt(struct svc_fh *fhp);
  * Function prototypes
  */
 __be32	fh_verify(struct svc_rqst *, struct svc_fh *, umode_t, int);
+__be32	fh_verify_local(struct net *, struct svc_cred *, struct auth_domain *,
+			struct svc_fh *, umode_t, int);
+__be32	fh_getattr(const struct svc_fh *fhp, struct kstat *stat);
 __be32	fh_compose(struct svc_fh *, struct svc_export *, struct dentry *, struct svc_fh *);
 __be32	fh_update(struct svc_fh *);
 void	fh_put(struct svc_fh *);
 
 static __inline__ struct svc_fh *
-fh_copy(struct svc_fh *dst, struct svc_fh *src)
+fh_copy(struct svc_fh *dst, const struct svc_fh *src)
 {
-	WARN_ON(src->fh_dentry || src->fh_locked);
-			
+	WARN_ON(src->fh_dentry);
+
 	*dst = *src;
 	return dst;
 }
 
 static inline void
-fh_copy_shallow(struct knfsd_fh *dst, struct knfsd_fh *src)
+fh_copy_shallow(struct knfsd_fh *dst, const struct knfsd_fh *src)
 {
 	dst->fh_size = src->fh_size;
-	memcpy(&dst->fh_base, &src->fh_base, src->fh_size);
+	memcpy(&dst->fh_raw, &src->fh_raw, src->fh_size);
 }
 
 static __inline__ struct svc_fh *
@@ -190,134 +251,89 @@ fh_init(struct svc_fh *fhp, int maxsize)
 	return fhp;
 }
 
-static inline bool fh_match(struct knfsd_fh *fh1, struct knfsd_fh *fh2)
+static inline bool fh_match(const struct knfsd_fh *fh1,
+			    const struct knfsd_fh *fh2)
 {
 	if (fh1->fh_size != fh2->fh_size)
 		return false;
-	if (memcmp(fh1->fh_base.fh_pad, fh2->fh_base.fh_pad, fh1->fh_size) != 0)
+	if (memcmp(fh1->fh_raw, fh2->fh_raw, fh1->fh_size) != 0)
 		return false;
 	return true;
 }
 
-static inline bool fh_fsid_match(struct knfsd_fh *fh1, struct knfsd_fh *fh2)
+static inline bool fh_fsid_match(const struct knfsd_fh *fh1,
+				 const struct knfsd_fh *fh2)
 {
+	u32 *fsid1 = fh_fsid(fh1);
+	u32 *fsid2 = fh_fsid(fh2);
+
 	if (fh1->fh_fsid_type != fh2->fh_fsid_type)
 		return false;
-	if (memcmp(fh1->fh_fsid, fh2->fh_fsid, key_len(fh1->fh_fsid_type)) != 0)
+	if (memcmp(fsid1, fsid2, key_len(fh1->fh_fsid_type)) != 0)
 		return false;
 	return true;
 }
 
-#ifdef CONFIG_CRC32
 /**
- * knfsd_fh_hash - calculate the crc32 hash for the filehandle
- * @fh - pointer to filehandle
+ * fh_want_write - Get write access to an export
+ * @fhp: File handle of file to be written
  *
- * returns a crc32 hash for the filehandle that is compatible with
- * the one displayed by "wireshark".
- */
-
-static inline u32
-knfsd_fh_hash(struct knfsd_fh *fh)
-{
-	return ~crc32_le(0xFFFFFFFF, (unsigned char *)&fh->fh_base, fh->fh_size);
-}
-#else
-static inline u32
-knfsd_fh_hash(struct knfsd_fh *fh)
-{
-	return 0;
-}
-#endif
-
-#ifdef CONFIG_NFSD_V3
-/*
- * The wcc data stored in current_fh should be cleared
- * between compound ops.
- */
-static inline void
-fh_clear_wcc(struct svc_fh *fhp)
-{
-	fhp->fh_post_saved = false;
-	fhp->fh_pre_saved = false;
-}
-
-/*
- * We could use i_version alone as the change attribute.  However,
- * i_version can go backwards after a reboot.  On its own that doesn't
- * necessarily cause a problem, but if i_version goes backwards and then
- * is incremented again it could reuse a value that was previously used
- * before boot, and a client who queried the two values might
- * incorrectly assume nothing changed.
+ * Caller must invoke fh_drop_write() when its write operation
+ * is complete.
  *
- * By using both ctime and the i_version counter we guarantee that as
- * long as time doesn't go backwards we never reuse an old value.
+ * Returns 0 if the file handle's export can be written to. Otherwise
+ * the export is not prepared for updates, and the returned negative
+ * errno value reflects the reason for the failure.
  */
-static inline u64 nfsd4_change_attribute(struct kstat *stat,
-					 struct inode *inode)
+static inline int fh_want_write(struct svc_fh *fhp)
 {
-	u64 chattr;
-
-	chattr =  stat->ctime.tv_sec;
-	chattr <<= 30;
-	chattr += stat->ctime.tv_nsec;
-	chattr += inode_query_iversion(inode);
-	return chattr;
+	int ret;
+
+	if (fhp->fh_want_write)
+		return 0;
+	ret = mnt_want_write(fhp->fh_export->ex_path.mnt);
+	if (!ret)
+		fhp->fh_want_write = true;
+	return ret;
 }
 
-extern void fill_pre_wcc(struct svc_fh *fhp);
-extern void fill_post_wcc(struct svc_fh *fhp);
-#else
-#define fh_clear_wcc(ignored)
-#define fill_pre_wcc(ignored)
-#define fill_post_wcc(notused)
-#endif /* CONFIG_NFSD_V3 */
-
-
-/*
- * Lock a file handle/inode
- * NOTE: both fh_lock and fh_unlock are done "by hand" in
- * vfs.c:nfsd_rename as it needs to grab 2 i_mutex's at once
- * so, any changes here should be reflected there.
+/**
+ * fh_drop_write - Release write access on an export
+ * @fhp: File handle of file on which fh_want_write() was previously called
  */
-
-static inline void
-fh_lock_nested(struct svc_fh *fhp, unsigned int subclass)
+static inline void fh_drop_write(struct svc_fh *fhp)
 {
-	struct dentry	*dentry = fhp->fh_dentry;
-	struct inode	*inode;
-
-	BUG_ON(!dentry);
-
-	if (fhp->fh_locked) {
-		printk(KERN_WARNING "fh_lock: %pd2 already locked!\n",
-			dentry);
-		return;
+	if (fhp->fh_want_write) {
+		fhp->fh_want_write = false;
+		mnt_drop_write(fhp->fh_export->ex_path.mnt);
 	}
-
-	inode = d_inode(dentry);
-	inode_lock_nested(inode, subclass);
-	fill_pre_wcc(fhp);
-	fhp->fh_locked = true;
 }
 
-static inline void
-fh_lock(struct svc_fh *fhp)
+/**
+ * knfsd_fh_hash - calculate the crc32 hash for the filehandle
+ * @fh - pointer to filehandle
+ *
+ * returns a crc32 hash for the filehandle that is compatible with
+ * the one displayed by "wireshark".
+ */
+static inline u32 knfsd_fh_hash(const struct knfsd_fh *fh)
 {
-	fh_lock_nested(fhp, I_MUTEX_NORMAL);
+	return ~crc32_le(0xFFFFFFFF, fh->fh_raw, fh->fh_size);
 }
 
-/*
- * Unlock a file handle/inode
+/**
+ * fh_clear_pre_post_attrs - Reset pre/post attributes
+ * @fhp: file handle to be updated
+ *
  */
-static inline void
-fh_unlock(struct svc_fh *fhp)
+static inline void fh_clear_pre_post_attrs(struct svc_fh *fhp)
 {
-	if (fhp->fh_locked) {
-		fill_post_wcc(fhp);
-		inode_unlock(d_inode(fhp->fh_dentry));
-		fhp->fh_locked = false;
-	}
+	fhp->fh_post_saved = false;
+	fhp->fh_pre_saved = false;
 }
 
+u64 nfsd4_change_attribute(const struct kstat *stat);
+__be32 __must_check fh_fill_pre_attrs(struct svc_fh *fhp);
+__be32 fh_fill_post_attrs(struct svc_fh *fhp);
+__be32 __must_check fh_fill_both_attrs(struct svc_fh *fhp);
 #endif /* _LINUX_NFSD_NFSFH_H */