diff options
Diffstat (limited to 'fs/nfsd/nfsfh.h')
| -rw-r--r-- | fs/nfsd/nfsfh.h | 171 |
1 files changed, 85 insertions, 86 deletions
diff --git a/fs/nfsd/nfsfh.h b/fs/nfsd/nfsfh.h index 56cfbc361561..c3ae6414fc5c 100644 --- a/fs/nfsd/nfsfh.h +++ b/fs/nfsd/nfsfh.h @@ -10,8 +10,56 @@ #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> + +/* + * 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. + */ + union { + char fh_raw[NFS4_FHSIZE]; + struct { + u8 fh_version; /* == 1 */ + u8 fh_auth_type; /* deprecated */ + u8 fh_fsid_type; + u8 fh_fileid_type; + u32 fh_fsid[]; /* flexible-array member */ + }; + }; +}; static inline __u32 ino_t_to_u32(ino_t ino) { @@ -33,14 +81,18 @@ 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 */ + bool fh_no_wcc; /* no wcc data needed */ + bool fh_no_atomic_attr; + /* + * wcc data is not atomic with + * operation + */ int fh_flags; /* FH flags */ -#ifdef CONFIG_NFSD_V3 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 timespec64 fh_pre_mtime; /* mtime before oper */ struct timespec64 fh_pre_ctime; /* ctime before oper */ @@ -50,11 +102,9 @@ typedef struct svc_fh { */ 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)) @@ -76,7 +126,7 @@ 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); /* @@ -172,8 +222,8 @@ void fh_put(struct svc_fh *); static __inline__ struct svc_fh * fh_copy(struct svc_fh *dst, struct svc_fh *src) { - WARN_ON(src->fh_dentry || src->fh_locked); - + WARN_ON(src->fh_dentry); + *dst = *src; return dst; } @@ -182,7 +232,7 @@ static inline void fh_copy_shallow(struct knfsd_fh *dst, 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 * @@ -197,7 +247,7 @@ static inline bool fh_match(struct knfsd_fh *fh1, 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; } @@ -219,27 +269,23 @@ static inline bool fh_fsid_match(struct knfsd_fh *fh1, struct knfsd_fh *fh2) * 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) +static inline u32 knfsd_fh_hash(const struct knfsd_fh *fh) { - return ~crc32_le(0xFFFFFFFF, (unsigned char *)&fh->fh_base, fh->fh_size); + return ~crc32_le(0xFFFFFFFF, fh->fh_raw, fh->fh_size); } #else -static inline u32 -knfsd_fh_hash(struct knfsd_fh *fh) +static inline u32 knfsd_fh_hash(const struct knfsd_fh *fh) { return 0; } #endif -#ifdef CONFIG_NFSD_V3 -/* - * The wcc data stored in current_fh should be cleared - * between compound ops. +/** + * fh_clear_pre_post_attrs - Reset pre/post attributes + * @fhp: file handle to be updated + * */ -static inline void -fh_clear_wcc(struct svc_fh *fhp) +static inline void fh_clear_pre_post_attrs(struct svc_fh *fhp) { fhp->fh_post_saved = false; fhp->fh_pre_saved = false; @@ -259,68 +305,21 @@ fh_clear_wcc(struct svc_fh *fhp) static inline u64 nfsd4_change_attribute(struct kstat *stat, struct inode *inode) { - u64 chattr; - - chattr = stat->ctime.tv_sec; - chattr <<= 30; - chattr += stat->ctime.tv_nsec; - chattr += inode_query_iversion(inode); - return chattr; -} - -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. - */ - -static inline void -fh_lock_nested(struct svc_fh *fhp, unsigned int subclass) -{ - 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; - } - - 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) -{ - fh_lock_nested(fhp, I_MUTEX_NORMAL); -} - -/* - * Unlock a file handle/inode - */ -static inline void -fh_unlock(struct svc_fh *fhp) -{ - if (fhp->fh_locked) { - fill_post_wcc(fhp); - inode_unlock(d_inode(fhp->fh_dentry)); - fhp->fh_locked = false; - } + if (inode->i_sb->s_export_op->fetch_iversion) + return inode->i_sb->s_export_op->fetch_iversion(inode); + else if (IS_I_VERSION(inode)) { + u64 chattr; + + chattr = stat->ctime.tv_sec; + chattr <<= 30; + chattr += stat->ctime.tv_nsec; + chattr += inode_query_iversion(inode); + return chattr; + } else + return time_to_chattr(&stat->ctime); } +extern void fh_fill_pre_attrs(struct svc_fh *fhp); +extern void fh_fill_post_attrs(struct svc_fh *fhp); +extern void fh_fill_both_attrs(struct svc_fh *fhp); #endif /* _LINUX_NFSD_NFSFH_H */ |