Commit | Line | Data |
---|---|---|
39d108be RM |
1 | /* |
2 | * Copyright (c) 1989 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * This code is derived from software contributed to Berkeley by | |
6 | * Rick Macklem at The University of Guelph. | |
7 | * | |
dbf0c423 | 8 | * %sccs.include.redist.c% |
39d108be | 9 | * |
b40809cc | 10 | * @(#)nfs_bio.c 7.19 (Berkeley) %G% |
39d108be RM |
11 | */ |
12 | ||
13 | #include "param.h" | |
4547a923 | 14 | #include "proc.h" |
39d108be | 15 | #include "buf.h" |
b40809cc KM |
16 | #include "uio.h" |
17 | #include "namei.h" | |
39d108be RM |
18 | #include "vnode.h" |
19 | #include "trace.h" | |
20 | #include "mount.h" | |
4547a923 MK |
21 | #include "resourcevar.h" |
22 | ||
39d108be | 23 | #include "nfsnode.h" |
e8540f59 KM |
24 | #include "nfsv2.h" |
25 | #include "nfs.h" | |
39d108be | 26 | #include "nfsiom.h" |
f0f1cbaa | 27 | #include "nfsmount.h" |
39d108be RM |
28 | |
29 | /* True and false, how exciting */ | |
30 | #define TRUE 1 | |
31 | #define FALSE 0 | |
32 | ||
33 | /* | |
34 | * Vnode op for read using bio | |
35 | * Any similarity to readip() is purely coincidental | |
36 | */ | |
f0f1cbaa | 37 | nfs_bioread(vp, uio, ioflag, cred) |
39d108be | 38 | register struct vnode *vp; |
170bfd05 | 39 | register struct uio *uio; |
39d108be RM |
40 | int ioflag; |
41 | struct ucred *cred; | |
42 | { | |
43 | register struct nfsnode *np = VTONFS(vp); | |
170bfd05 | 44 | register int biosize; |
39d108be RM |
45 | struct buf *bp; |
46 | struct vattr vattr; | |
47 | daddr_t lbn, bn, rablock; | |
13576453 | 48 | int diff, error = 0; |
39d108be | 49 | long n, on; |
39d108be | 50 | |
d4e5799e KM |
51 | #ifdef lint |
52 | ioflag = ioflag; | |
53 | #endif /* lint */ | |
b40809cc | 54 | #ifdef DIAGNOSTIC |
39d108be RM |
55 | if (uio->uio_rw != UIO_READ) |
56 | panic("nfs_read mode"); | |
b40809cc | 57 | #endif |
39d108be | 58 | if (uio->uio_resid == 0) |
b71430cc | 59 | return (0); |
f0f1cbaa | 60 | if (uio->uio_offset < 0 && vp->v_type != VDIR) |
b71430cc | 61 | return (EINVAL); |
170bfd05 | 62 | biosize = VFSTONFS(vp->v_mount)->nm_rsize; |
39d108be RM |
63 | /* |
64 | * If the file's modify time on the server has changed since the | |
65 | * last read rpc or you have written to the file, | |
66 | * you may have lost data cache consistency with the | |
67 | * server, so flush all of the file's data out of the cache. | |
f0f1cbaa KM |
68 | * Then force a getattr rpc to ensure that you have up to date |
69 | * attributes. | |
39d108be RM |
70 | * NB: This implies that cache data can be read when up to |
71 | * NFS_ATTRTIMEO seconds out of date. If you find that you need current | |
72 | * attributes this could be forced by setting n_attrstamp to 0 before | |
170bfd05 | 73 | * the nfs_dogetattr() call. |
39d108be | 74 | */ |
f0f1cbaa KM |
75 | if (vp->v_type != VLNK) { |
76 | if (np->n_flag & NMODIFIED) { | |
77 | np->n_flag &= ~NMODIFIED; | |
78 | vinvalbuf(vp, TRUE); | |
79 | np->n_attrstamp = 0; | |
80 | np->n_direofoffset = 0; | |
b40809cc KM |
81 | if (error = nfs_dogetattr(vp, &vattr, cred, 1, |
82 | uio->uio_procp)) | |
e8540f59 KM |
83 | return (error); |
84 | np->n_mtime = vattr.va_mtime.tv_sec; | |
f0f1cbaa | 85 | } else { |
b40809cc KM |
86 | if (error = nfs_dogetattr(vp, &vattr, cred, 1, |
87 | uio->uio_procp)) | |
f0f1cbaa KM |
88 | return (error); |
89 | if (np->n_mtime != vattr.va_mtime.tv_sec) { | |
90 | np->n_direofoffset = 0; | |
91 | vinvalbuf(vp, TRUE); | |
92 | np->n_mtime = vattr.va_mtime.tv_sec; | |
93 | } | |
39d108be RM |
94 | } |
95 | } | |
96 | do { | |
f0f1cbaa KM |
97 | switch (vp->v_type) { |
98 | case VREG: | |
e8540f59 | 99 | nfsstats.biocache_reads++; |
170bfd05 KM |
100 | lbn = uio->uio_offset / biosize; |
101 | on = uio->uio_offset & (biosize-1); | |
102 | n = MIN((unsigned)(biosize - on), uio->uio_resid); | |
39d108be RM |
103 | diff = np->n_size - uio->uio_offset; |
104 | if (diff <= 0) | |
b71430cc | 105 | return (error); |
39d108be RM |
106 | if (diff < n) |
107 | n = diff; | |
170bfd05 KM |
108 | bn = lbn*(biosize/DEV_BSIZE); |
109 | rablock = (lbn+1)*(biosize/DEV_BSIZE); | |
d1a28114 KM |
110 | if (vp->v_lastr + 1 == lbn && |
111 | np->n_size > (rablock * DEV_BSIZE)) | |
170bfd05 | 112 | error = breada(vp, bn, biosize, rablock, biosize, |
39d108be RM |
113 | cred, &bp); |
114 | else | |
170bfd05 | 115 | error = bread(vp, bn, biosize, cred, &bp); |
d1a28114 | 116 | vp->v_lastr = lbn; |
39d108be | 117 | if (bp->b_resid) { |
170bfd05 KM |
118 | diff = (on >= (biosize-bp->b_resid)) ? 0 : |
119 | (biosize-bp->b_resid-on); | |
f0f1cbaa | 120 | n = MIN(n, diff); |
39d108be | 121 | } |
f0f1cbaa KM |
122 | break; |
123 | case VLNK: | |
124 | nfsstats.biocache_readlinks++; | |
125 | on = 0; | |
126 | error = bread(vp, (daddr_t)0, NFS_MAXPATHLEN, cred, &bp); | |
127 | n = MIN(uio->uio_resid, NFS_MAXPATHLEN - bp->b_resid); | |
128 | break; | |
129 | case VDIR: | |
130 | nfsstats.biocache_readdirs++; | |
131 | on = 0; | |
b40809cc KM |
132 | error = bread(vp, uio->uio_offset, NFS_DIRBLKSIZ, cred, &bp); |
133 | n = MIN(uio->uio_resid, NFS_DIRBLKSIZ - bp->b_resid); | |
f0f1cbaa KM |
134 | break; |
135 | }; | |
136 | if (error) { | |
137 | brelse(bp); | |
138 | return (error); | |
139 | } | |
140 | if (n > 0) | |
141 | error = uiomove(bp->b_un.b_addr + on, (int)n, uio); | |
142 | switch (vp->v_type) { | |
143 | case VREG: | |
170bfd05 | 144 | if (n+on == biosize || uio->uio_offset == np->n_size) |
39d108be | 145 | bp->b_flags |= B_AGE; |
f0f1cbaa KM |
146 | break; |
147 | case VLNK: | |
148 | n = 0; | |
149 | break; | |
150 | case VDIR: | |
151 | uio->uio_offset = bp->b_blkno; | |
152 | break; | |
153 | }; | |
154 | brelse(bp); | |
39d108be | 155 | } while (error == 0 && uio->uio_resid > 0 && n != 0); |
39d108be RM |
156 | return (error); |
157 | } | |
158 | ||
159 | /* | |
160 | * Vnode op for write using bio | |
161 | */ | |
b71430cc | 162 | nfs_write(vp, uio, ioflag, cred) |
39d108be RM |
163 | register struct vnode *vp; |
164 | register struct uio *uio; | |
39d108be RM |
165 | int ioflag; |
166 | struct ucred *cred; | |
167 | { | |
b40809cc | 168 | struct proc *p = uio->uio_procp; |
170bfd05 | 169 | register int biosize; |
39d108be RM |
170 | struct buf *bp; |
171 | struct nfsnode *np = VTONFS(vp); | |
f0f1cbaa | 172 | struct vattr vattr; |
39d108be | 173 | daddr_t lbn, bn; |
3c15394b | 174 | int n, on, error = 0; |
39d108be | 175 | |
b40809cc | 176 | #ifdef DIAGNOSTIC |
f0f1cbaa KM |
177 | if (uio->uio_rw != UIO_WRITE) |
178 | panic("nfs_write mode"); | |
b40809cc KM |
179 | if (uio->uio_segflg == UIO_USERSPACE && uio->uio_procp != curproc) |
180 | panic("nfs_write proc"); | |
181 | #endif | |
f0f1cbaa KM |
182 | if (vp->v_type != VREG) |
183 | return (EIO); | |
39d108be | 184 | /* Should we try and do this ?? */ |
170bfd05 | 185 | if (ioflag & (IO_APPEND | IO_SYNC)) { |
f0f1cbaa KM |
186 | if (np->n_flag & NMODIFIED) { |
187 | np->n_flag &= ~NMODIFIED; | |
188 | vinvalbuf(vp, TRUE); | |
189 | } | |
170bfd05 KM |
190 | if (ioflag & IO_APPEND) { |
191 | np->n_attrstamp = 0; | |
b40809cc | 192 | if (error = nfs_dogetattr(vp, &vattr, cred, 1, p)) |
170bfd05 KM |
193 | return (error); |
194 | uio->uio_offset = np->n_size; | |
195 | } | |
b40809cc | 196 | return (nfs_writerpc(vp, uio, cred)); |
f0f1cbaa | 197 | } |
39d108be | 198 | #ifdef notdef |
b71430cc | 199 | cnt = uio->uio_resid; |
39d108be RM |
200 | osize = np->n_size; |
201 | #endif | |
b71430cc KM |
202 | if (uio->uio_offset < 0) |
203 | return (EINVAL); | |
39d108be | 204 | if (uio->uio_resid == 0) |
b71430cc | 205 | return (0); |
39d108be RM |
206 | /* |
207 | * Maybe this should be above the vnode op call, but so long as | |
208 | * file servers have no limits, i don't think it matters | |
209 | */ | |
f0f1cbaa | 210 | if (uio->uio_offset + uio->uio_resid > |
4547a923 MK |
211 | p->p_rlimit[RLIMIT_FSIZE].rlim_cur) { |
212 | psignal(p, SIGXFSZ); | |
b71430cc | 213 | return (EFBIG); |
39d108be | 214 | } |
170bfd05 KM |
215 | /* |
216 | * I use nm_rsize, not nm_wsize so that all buffer cache blocks | |
217 | * will be the same size within a filesystem. nfs_writerpc will | |
218 | * still use nm_wsize when sizing the rpc's. | |
219 | */ | |
220 | biosize = VFSTONFS(vp->v_mount)->nm_rsize; | |
f0f1cbaa | 221 | np->n_flag |= NMODIFIED; |
39d108be | 222 | do { |
e8540f59 | 223 | nfsstats.biocache_writes++; |
170bfd05 KM |
224 | lbn = uio->uio_offset / biosize; |
225 | on = uio->uio_offset & (biosize-1); | |
226 | n = MIN((unsigned)(biosize - on), uio->uio_resid); | |
8986c97c | 227 | if (uio->uio_offset+n > np->n_size) { |
39d108be | 228 | np->n_size = uio->uio_offset+n; |
8986c97c KM |
229 | vnode_pager_setsize(vp, np->n_size); |
230 | } | |
170bfd05 | 231 | bn = lbn*(biosize/DEV_BSIZE); |
141671b8 | 232 | again: |
170bfd05 | 233 | bp = getblk(vp, bn, biosize); |
39d108be RM |
234 | if (bp->b_wcred == NOCRED) { |
235 | crhold(cred); | |
236 | bp->b_wcred = cred; | |
237 | } | |
238 | if (bp->b_dirtyend > 0) { | |
239 | /* | |
141671b8 KM |
240 | * If the new write will leave a contiguous dirty |
241 | * area, just update the b_dirtyoff and b_dirtyend, | |
242 | * otherwise force a write rpc of the old dirty area. | |
39d108be RM |
243 | */ |
244 | if (on <= bp->b_dirtyend && (on+n) >= bp->b_dirtyoff) { | |
245 | bp->b_dirtyoff = MIN(on, bp->b_dirtyoff); | |
246 | bp->b_dirtyend = MAX((on+n), bp->b_dirtyend); | |
247 | } else { | |
4547a923 | 248 | bp->b_proc = p; |
141671b8 | 249 | if (error = bwrite(bp)) |
b71430cc | 250 | return (error); |
141671b8 | 251 | goto again; |
39d108be RM |
252 | } |
253 | } else { | |
254 | bp->b_dirtyoff = on; | |
255 | bp->b_dirtyend = on+n; | |
256 | } | |
141671b8 KM |
257 | if (error = uiomove(bp->b_un.b_addr + on, n, uio)) { |
258 | brelse(bp); | |
b71430cc | 259 | return (error); |
141671b8 | 260 | } |
170bfd05 | 261 | if ((n+on) == biosize) { |
39d108be | 262 | bp->b_flags |= B_AGE; |
f0f1cbaa | 263 | bp->b_proc = (struct proc *)0; |
39d108be RM |
264 | bawrite(bp); |
265 | } else { | |
f0f1cbaa | 266 | bp->b_proc = (struct proc *)0; |
39d108be RM |
267 | bdwrite(bp); |
268 | } | |
269 | } while (error == 0 && uio->uio_resid > 0 && n != 0); | |
270 | #ifdef notdef | |
271 | /* Should we try and do this for nfs ?? */ | |
b71430cc | 272 | if (error && (ioflag & IO_UNIT)) { |
39d108be | 273 | np->n_size = osize; |
b71430cc KM |
274 | uio->uio_offset -= cnt - uio->uio_resid; |
275 | uio->uio_resid = cnt; | |
276 | } | |
39d108be | 277 | #endif |
39d108be RM |
278 | return (error); |
279 | } |