| /* |
| * include/linux/nfsd/nfsfh.h |
| * |
| * This file describes the layout of the file handles as passed |
| * over the wire. |
| * |
| * Earlier versions of knfsd used to sign file handles using keyed MD5 |
| * or SHA. I've removed this code, because it doesn't give you more |
| * security than blocking external access to port 2049 on your firewall. |
| * |
| * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de> |
| */ |
| |
| #ifndef _LINUX_NFSD_FH_H |
| #define _LINUX_NFSD_FH_H |
| |
| # include <linux/types.h> |
| #ifdef __KERNEL__ |
| # include <linux/string.h> |
| # include <linux/fs.h> |
| #endif |
| #include <linux/nfsd/const.h> |
| #include <linux/nfsd/debug.h> |
| |
| /* |
| * This is the old "dentry style" Linux NFSv2 file handle. |
| * |
| * The xino and xdev fields are currently used to transport the |
| * ino/dev of the exported inode. |
| */ |
| struct nfs_fhbase_old { |
| __u32 fb_dcookie; /* dentry cookie - always 0xfeebbaca */ |
| __u32 fb_ino; /* our inode number */ |
| __u32 fb_dirino; /* dir inode number, 0 for directories */ |
| __u32 fb_dev; /* our device */ |
| __u32 fb_xdev; |
| __u32 fb_xino; |
| __u32 fb_generation; |
| }; |
| |
| /* |
| * This is the new flexible, extensible style NFSv2/v3 file handle. |
| * by Neil Brown <neilb@cse.unsw.edu.au> - March 2000 |
| * |
| * The file handle is seens as a list of 4byte words. |
| * The first word contains a version number (1) and four 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 4byte values are in host-byte-order. |
| * |
| * The auth_type field specifies how the filehandle can be authenticated |
| * This might allow a file to be confirmed to be in a writable part of a |
| * filetree without checking the path from it upto the root. |
| * Current values: |
| * 0 - No authentication. fb_auth is 0 bytes long |
| * Possible future values: |
| * 1 - 4 bytes taken from MD5 hash of the remainer of the file handle |
| * prefixed by a secret and with the important export flags. |
| * |
| * 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 identified how the file within the filesystem is encoded. |
| * This is (will be) passed to, and set by, the underlying filesystem if it supports |
| * filehandle operations. The filesystem must not use the value '0' or '0xff' and may |
| * only use the values 1 and 2 as defined below: |
| * Current values: |
| * 0 - The root, or export point, of the filesystem. fb_fileid is 0 bytes. |
| * 1 - 32bit inode number, 32 bit generation number. |
| * 2 - 32bit inode number, 32 bit generation number, 32 bit parent directory inode number. |
| * |
| */ |
| struct nfs_fhbase_new { |
| __u8 fb_version; /* == 1, even => nfs_fhbase_old */ |
| __u8 fb_auth_type; |
| __u8 fb_fsid_type; |
| __u8 fb_fileid_type; |
| __u32 fb_auth[1]; |
| /* __u32 fb_fsid[0]; floating */ |
| /* __u32 fb_fileid[0]; floating */ |
| }; |
| |
| struct knfsd_fh { |
| unsigned int fh_size; /* significant for NFSv3. |
| * Points to the current size while building |
| * a new file handle |
| */ |
| union { |
| struct nfs_fhbase_old fh_old; |
| __u32 fh_pad[NFS4_FHSIZE/4]; |
| struct nfs_fhbase_new fh_new; |
| } fh_base; |
| }; |
| |
| #define ofh_dcookie fh_base.fh_old.fb_dcookie |
| #define ofh_ino fh_base.fh_old.fb_ino |
| #define ofh_dirino fh_base.fh_old.fb_dirino |
| #define ofh_dev fh_base.fh_old.fb_dev |
| #define ofh_xdev fh_base.fh_old.fb_xdev |
| #define ofh_xino fh_base.fh_old.fb_xino |
| #define ofh_generation fh_base.fh_old.fb_generation |
| |
| #define fh_version fh_base.fh_new.fb_version |
| #define fh_fsid_type fh_base.fh_new.fb_fsid_type |
| #define fh_auth_type fh_base.fh_new.fb_auth_type |
| #define fh_fileid_type fh_base.fh_new.fb_fileid_type |
| #define fh_auth fh_base.fh_new.fb_auth |
| #define fh_fsid fh_base.fh_new.fb_auth |
| |
| #ifdef __KERNEL__ |
| |
| static inline __u32 ino_t_to_u32(ino_t ino) |
| { |
| return (__u32) ino; |
| } |
| |
| static inline ino_t u32_to_ino_t(__u32 uino) |
| { |
| return (ino_t) uino; |
| } |
| |
| /* |
| * This is the internal representation of an NFS handle used in knfsd. |
| * pre_mtime/post_version will be used to support wcc_attr's in NFSv3. |
| */ |
| typedef struct svc_fh { |
| struct knfsd_fh fh_handle; /* FH data */ |
| struct dentry * fh_dentry; /* validated dentry */ |
| struct svc_export * fh_export; /* export pointer */ |
| int fh_maxsize; /* max size for fh_handle */ |
| |
| unsigned char fh_locked; /* inode locked by us */ |
| |
| #ifdef CONFIG_NFSD_V3 |
| unsigned char fh_post_saved; /* post-op attrs saved */ |
| unsigned char fh_pre_saved; /* pre-op attrs saved */ |
| |
| /* Pre-op attributes saved during fh_lock */ |
| __u64 fh_pre_size; /* size before operation */ |
| struct timespec fh_pre_mtime; /* mtime before oper */ |
| struct timespec fh_pre_ctime; /* ctime before oper */ |
| |
| /* Post-op attributes saved in fh_unlock */ |
| struct kstat fh_post_attr; /* full attrs after operation */ |
| #endif /* CONFIG_NFSD_V3 */ |
| |
| } svc_fh; |
| |
| enum nfsd_fsid { |
| FSID_DEV = 0, |
| FSID_NUM, |
| FSID_MAJOR_MINOR, |
| FSID_ENCODE_DEV, |
| FSID_UUID4_INUM, |
| FSID_UUID8, |
| FSID_UUID16, |
| FSID_UUID16_INUM, |
| }; |
| |
| enum fsid_source { |
| FSIDSOURCE_DEV, |
| FSIDSOURCE_FSID, |
| FSIDSOURCE_UUID, |
| }; |
| extern enum fsid_source fsid_source(struct svc_fh *fhp); |
| |
| |
| /* This might look a little large to "inline" but in all calls except |
| * one, 'vers' is constant so moste of the function disappears. |
| */ |
| static inline void mk_fsid(int vers, u32 *fsidv, dev_t dev, ino_t ino, |
| u32 fsid, unsigned char *uuid) |
| { |
| u32 *up; |
| switch(vers) { |
| case FSID_DEV: |
| fsidv[0] = htonl((MAJOR(dev)<<16) | |
| MINOR(dev)); |
| fsidv[1] = ino_t_to_u32(ino); |
| break; |
| case FSID_NUM: |
| fsidv[0] = fsid; |
| break; |
| case FSID_MAJOR_MINOR: |
| fsidv[0] = htonl(MAJOR(dev)); |
| fsidv[1] = htonl(MINOR(dev)); |
| fsidv[2] = ino_t_to_u32(ino); |
| break; |
| |
| case FSID_ENCODE_DEV: |
| fsidv[0] = new_encode_dev(dev); |
| fsidv[1] = ino_t_to_u32(ino); |
| break; |
| |
| case FSID_UUID4_INUM: |
| /* 4 byte fsid and inode number */ |
| up = (u32*)uuid; |
| fsidv[0] = ino_t_to_u32(ino); |
| fsidv[1] = up[0] ^ up[1] ^ up[2] ^ up[3]; |
| break; |
| |
| case FSID_UUID8: |
| /* 8 byte fsid */ |
| up = (u32*)uuid; |
| fsidv[0] = up[0] ^ up[2]; |
| fsidv[1] = up[1] ^ up[3]; |
| break; |
| |
| case FSID_UUID16: |
| /* 16 byte fsid - NFSv3+ only */ |
| memcpy(fsidv, uuid, 16); |
| break; |
| |
| case FSID_UUID16_INUM: |
| /* 8 byte inode and 16 byte fsid */ |
| *(u64*)fsidv = (u64)ino; |
| memcpy(fsidv+2, uuid, 16); |
| break; |
| default: BUG(); |
| } |
| } |
| |
| static inline int key_len(int type) |
| { |
| switch(type) { |
| case FSID_DEV: return 8; |
| case FSID_NUM: return 4; |
| case FSID_MAJOR_MINOR: return 12; |
| case FSID_ENCODE_DEV: return 8; |
| case FSID_UUID4_INUM: return 8; |
| case FSID_UUID8: return 8; |
| case FSID_UUID16: return 16; |
| case FSID_UUID16_INUM: return 24; |
| default: return 0; |
| } |
| } |
| |
| /* |
| * Shorthand for dprintk()'s |
| */ |
| extern char * SVCFH_fmt(struct svc_fh *fhp); |
| |
| /* |
| * Function prototypes |
| */ |
| __be32 fh_verify(struct svc_rqst *, struct svc_fh *, int, int); |
| __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) |
| { |
| WARN_ON(src->fh_dentry || src->fh_locked); |
| |
| *dst = *src; |
| return dst; |
| } |
| |
| static __inline__ struct svc_fh * |
| fh_init(struct svc_fh *fhp, int maxsize) |
| { |
| memset(fhp, 0, sizeof(*fhp)); |
| fhp->fh_maxsize = maxsize; |
| return fhp; |
| } |
| |
| #ifdef CONFIG_NFSD_V3 |
| /* |
| * Fill in the pre_op attr for the wcc data |
| */ |
| static inline void |
| fill_pre_wcc(struct svc_fh *fhp) |
| { |
| struct inode *inode; |
| |
| inode = fhp->fh_dentry->d_inode; |
| if (!fhp->fh_pre_saved) { |
| fhp->fh_pre_mtime = inode->i_mtime; |
| fhp->fh_pre_ctime = inode->i_ctime; |
| fhp->fh_pre_size = inode->i_size; |
| fhp->fh_pre_saved = 1; |
| } |
| } |
| |
| extern void fill_post_wcc(struct svc_fh *); |
| #else |
| #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; |
| |
| dfprintk(FILEOP, "nfsd: fh_lock(%s) locked = %d\n", |
| SVCFH_fmt(fhp), fhp->fh_locked); |
| |
| BUG_ON(!dentry); |
| |
| if (fhp->fh_locked) { |
| printk(KERN_WARNING "fh_lock: %s/%s already locked!\n", |
| dentry->d_parent->d_name.name, dentry->d_name.name); |
| return; |
| } |
| |
| inode = dentry->d_inode; |
| mutex_lock_nested(&inode->i_mutex, subclass); |
| fill_pre_wcc(fhp); |
| fhp->fh_locked = 1; |
| } |
| |
| 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) |
| { |
| BUG_ON(!fhp->fh_dentry); |
| |
| if (fhp->fh_locked) { |
| fill_post_wcc(fhp); |
| mutex_unlock(&fhp->fh_dentry->d_inode->i_mutex); |
| fhp->fh_locked = 0; |
| } |
| } |
| #endif /* __KERNEL__ */ |
| |
| |
| #endif /* _LINUX_NFSD_FH_H */ |