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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 | /* Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de> */ #ifndef _LINUX_NFSD_FH_INT_H #define _LINUX_NFSD_FH_INT_H #include <linux/nfsd/nfsfh.h> 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 *, umode_t, 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 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); } 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_change = inode->i_version; 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; 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) { if (fhp->fh_locked) { fill_post_wcc(fhp); mutex_unlock(&fhp->fh_dentry->d_inode->i_mutex); fhp->fh_locked = 0; } } #endif /* _LINUX_NFSD_FH_INT_H */ |