1 0c98da8b 2005-07-13 devnull #include <u.h>
  2 0c98da8b 2005-07-13 devnull #include <libc.h>
  3 0c98da8b 2005-07-13 devnull #include <thread.h>
  4 0c98da8b 2005-07-13 devnull #include <sunrpc.h>
  5 0c98da8b 2005-07-13 devnull #include <nfs3.h>
  6 0c98da8b 2005-07-13 devnull #include <diskfs.h>
  7 0c98da8b 2005-07-13 devnull #include "ext2.h"
  8 0c98da8b 2005-07-13 devnull 
  9 0c98da8b 2005-07-13 devnull #define debug 1
 10 0c98da8b 2005-07-13 devnull 
 11 0c98da8b 2005-07-13 devnull static int ext2sync(Fsys*);
 12 0c98da8b 2005-07-13 devnull static void ext2close(Fsys*);
 13 0c98da8b 2005-07-13 devnull static Block* ext2blockread(Fsys*, u64int);
 14 0c98da8b 2005-07-13 devnull 
 15 0c98da8b 2005-07-13 devnull static Nfs3Status ext2root(Fsys*, Nfs3Handle*);
 16 0c98da8b 2005-07-13 devnull static Nfs3Status ext2getattr(Fsys*, SunAuthUnix *au, Nfs3Handle*, Nfs3Attr*);
 17 0c98da8b 2005-07-13 devnull static Nfs3Status ext2lookup(Fsys*, SunAuthUnix *au, Nfs3Handle*, char*, Nfs3Handle*);
 18 0c98da8b 2005-07-13 devnull static Nfs3Status ext2readfile(Fsys*, SunAuthUnix *au, Nfs3Handle*, u32int, u64int, uchar**, u32int*, u1int*);
 19 0c98da8b 2005-07-13 devnull static Nfs3Status ext2readlink(Fsys *fsys, SunAuthUnix *au, Nfs3Handle *h, char **link);
 20 0c98da8b 2005-07-13 devnull static Nfs3Status ext2readdir(Fsys *fsys, SunAuthUnix *au, Nfs3Handle *h, u32int, u64int, uchar**, u32int*, u1int*);
 21 0c98da8b 2005-07-13 devnull static Nfs3Status ext2access(Fsys *fsys, SunAuthUnix *au, Nfs3Handle *h, u32int want, u32int *got, Nfs3Attr *attr);
 22 0c98da8b 2005-07-13 devnull 
 23 0c98da8b 2005-07-13 devnull Fsys*
 24 0c98da8b 2005-07-13 devnull fsysopenext2(Disk *disk)
 25 0c98da8b 2005-07-13 devnull {
 26 0c98da8b 2005-07-13 devnull 	Ext2 *fs;
 27 0c98da8b 2005-07-13 devnull 	Fsys *fsys;
 28 0c98da8b 2005-07-13 devnull 
 29 0c98da8b 2005-07-13 devnull 	fsys = emalloc(sizeof(Fsys));
 30 0c98da8b 2005-07-13 devnull 	fs = emalloc(sizeof(Ext2));
 31 0c98da8b 2005-07-13 devnull 	fs->disk = disk;
 32 0c98da8b 2005-07-13 devnull 	fsys->priv = fs;
 33 0c98da8b 2005-07-13 devnull 	fs->fsys = fsys;
 34 0c98da8b 2005-07-13 devnull 	fsys->type = "ext2";
 35 0c98da8b 2005-07-13 devnull 	fsys->_readblock = ext2blockread;
 36 0c98da8b 2005-07-13 devnull 	fsys->_sync = ext2sync;
 37 0c98da8b 2005-07-13 devnull 	fsys->_root = ext2root;
 38 0c98da8b 2005-07-13 devnull 	fsys->_getattr = ext2getattr;
 39 0c98da8b 2005-07-13 devnull 	fsys->_access = ext2access;
 40 0c98da8b 2005-07-13 devnull 	fsys->_lookup = ext2lookup;
 41 0c98da8b 2005-07-13 devnull 	fsys->_readfile = ext2readfile;
 42 0c98da8b 2005-07-13 devnull 	fsys->_readlink = ext2readlink;
 43 0c98da8b 2005-07-13 devnull 	fsys->_readdir = ext2readdir;
 44 0c98da8b 2005-07-13 devnull 
 45 0c98da8b 2005-07-13 devnull 	if(ext2sync(fsys) < 0)
 46 0c98da8b 2005-07-13 devnull 		goto error;
 47 0c98da8b 2005-07-13 devnull 
 48 0c98da8b 2005-07-13 devnull 	return fsys;
 49 0c98da8b 2005-07-13 devnull 
 50 0c98da8b 2005-07-13 devnull error:
 51 0c98da8b 2005-07-13 devnull 	ext2close(fsys);
 52 0c98da8b 2005-07-13 devnull 	return nil;
 53 0c98da8b 2005-07-13 devnull }
 54 0c98da8b 2005-07-13 devnull 
 55 0c98da8b 2005-07-13 devnull static void
 56 0c98da8b 2005-07-13 devnull ext2close(Fsys *fsys)
 57 0c98da8b 2005-07-13 devnull {
 58 0c98da8b 2005-07-13 devnull 	Ext2 *fs;
 59 0c98da8b 2005-07-13 devnull 
 60 0c98da8b 2005-07-13 devnull 	fs = fsys->priv;
 61 0c98da8b 2005-07-13 devnull 	free(fs);
 62 0c98da8b 2005-07-13 devnull 	free(fsys);
 63 0c98da8b 2005-07-13 devnull }
 64 0c98da8b 2005-07-13 devnull 
 65 0c98da8b 2005-07-13 devnull static Group*
 66 0c98da8b 2005-07-13 devnull ext2group(Ext2 *fs, u32int i, Block **pb)
 67 0c98da8b 2005-07-13 devnull {
 68 0c98da8b 2005-07-13 devnull 	Block *b;
 69 0c98da8b 2005-07-13 devnull 	u64int addr;
 70 0c98da8b 2005-07-13 devnull 	Group *g;
 71 0c98da8b 2005-07-13 devnull 
 72 0c98da8b 2005-07-13 devnull 	if(i >= fs->ngroup)
 73 0c98da8b 2005-07-13 devnull 		return nil;
 74 0c98da8b 2005-07-13 devnull 
 75 0c98da8b 2005-07-13 devnull 	addr = fs->groupaddr + i/fs->descperblock;
 76 0c98da8b 2005-07-13 devnull 	b = diskread(fs->disk, fs->blocksize, addr*fs->blocksize);
 77 0c98da8b 2005-07-13 devnull 	if(b == nil)
 78 0c98da8b 2005-07-13 devnull 		return nil;
 79 0c98da8b 2005-07-13 devnull 	g = (Group*)(b->data+i%fs->descperblock*GroupSize);
 80 0c98da8b 2005-07-13 devnull 	*pb = b;
 81 0c98da8b 2005-07-13 devnull 	return g;
 82 0c98da8b 2005-07-13 devnull }
 83 0c98da8b 2005-07-13 devnull 
 84 0c98da8b 2005-07-13 devnull static Block*
 85 0c98da8b 2005-07-13 devnull ext2blockread(Fsys *fsys, u64int vbno)
 86 0c98da8b 2005-07-13 devnull {
 87 0c98da8b 2005-07-13 devnull 	Block *bitb;
 88 0c98da8b 2005-07-13 devnull 	Group *g;
 89 0c98da8b 2005-07-13 devnull 	Block *gb;
 90 0c98da8b 2005-07-13 devnull 	uchar *bits;
 91 0c98da8b 2005-07-13 devnull 	u32int bno, boff;
 92 0c98da8b 2005-07-13 devnull 	Ext2 *fs;
 93 0c98da8b 2005-07-13 devnull 
 94 0c98da8b 2005-07-13 devnull 	fs = fsys->priv;
 95 0c98da8b 2005-07-13 devnull 	if(vbno >= fs->nblock)
 96 0c98da8b 2005-07-13 devnull 		return nil;
 97 0c98da8b 2005-07-13 devnull 	bno = vbno;
 98 0c98da8b 2005-07-13 devnull 	if(bno != vbno)
 99 0c98da8b 2005-07-13 devnull 		return nil;
100 0c98da8b 2005-07-13 devnull 
101 0c98da8b 2005-07-13 devnull /*	
102 0c98da8b 2005-07-13 devnull 	if(bno < fs->firstblock)
103 0c98da8b 2005-07-13 devnull 		return diskread(fs->disk, fs->blocksize, (u64int)bno*fs->blocksize);
104 0c98da8b 2005-07-13 devnull */
105 0c98da8b 2005-07-13 devnull 	if(bno < fs->firstblock)
106 0c98da8b 2005-07-13 devnull 		return nil;
107 0c98da8b 2005-07-13 devnull 
108 0c98da8b 2005-07-13 devnull 	bno -= fs->firstblock;
109 0c98da8b 2005-07-13 devnull 	if((g = ext2group(fs, bno/fs->blockspergroup, &gb)) == nil){
110 0c98da8b 2005-07-13 devnull 		if(debug)
111 0c98da8b 2005-07-13 devnull 			fprint(2, "loading group: %r...");
112 0c98da8b 2005-07-13 devnull 		return nil;
113 0c98da8b 2005-07-13 devnull 	}
114 0c98da8b 2005-07-13 devnull //	if(debug)
115 0c98da8b 2005-07-13 devnull //		fprint(2, "group %d bitblock=%d...", bno/fs->blockspergroup, g->bitblock);
116 0c98da8b 2005-07-13 devnull 
117 0c98da8b 2005-07-13 devnull 	if((bitb = diskread(fs->disk, fs->blocksize, (u64int)g->bitblock*fs->blocksize)) == nil){
118 0c98da8b 2005-07-13 devnull 		if(debug)
119 0c98da8b 2005-07-13 devnull 			fprint(2, "loading bitblock: %r...");
120 0c98da8b 2005-07-13 devnull 		blockput(gb);
121 0c98da8b 2005-07-13 devnull 		return nil;
122 0c98da8b 2005-07-13 devnull 	}
123 0c98da8b 2005-07-13 devnull 	bits = bitb->data;
124 0c98da8b 2005-07-13 devnull 	boff = bno%fs->blockspergroup;
125 0c98da8b 2005-07-13 devnull 	if((bits[boff>>3] & (1<<(boff&7))) == 0){
126 0c98da8b 2005-07-13 devnull 		if(debug)
127 0c98da8b 2005-07-13 devnull 			fprint(2, "block %d not allocated...", bno);
128 0c98da8b 2005-07-13 devnull 		blockput(bitb);
129 0c98da8b 2005-07-13 devnull 		blockput(gb);
130 0c98da8b 2005-07-13 devnull 		return nil;
131 0c98da8b 2005-07-13 devnull 	}
132 0c98da8b 2005-07-13 devnull 
133 0c98da8b 2005-07-13 devnull 	bno += fs->firstblock;
134 0c98da8b 2005-07-13 devnull 	return diskread(fs->disk, fs->blocksize, (u64int)bno*fs->blocksize);
135 0c98da8b 2005-07-13 devnull }
136 0c98da8b 2005-07-13 devnull 
137 0c98da8b 2005-07-13 devnull static Block*
138 0c98da8b 2005-07-13 devnull ext2datablock(Ext2 *fs, u32int bno, int size)
139 0c98da8b 2005-07-13 devnull {
140 0c98da8b 2005-07-13 devnull 	return ext2blockread(fs->fsys, bno+fs->firstblock);
141 0c98da8b 2005-07-13 devnull }
142 0c98da8b 2005-07-13 devnull 
143 0c98da8b 2005-07-13 devnull static Block*
144 0c98da8b 2005-07-13 devnull ext2fileblock(Ext2 *fs, Inode *ino, u32int bno, int size)
145 0c98da8b 2005-07-13 devnull {
146 0c98da8b 2005-07-13 devnull 	int ppb;
147 0c98da8b 2005-07-13 devnull 	Block *b;
148 0c98da8b 2005-07-13 devnull 	u32int *a;
149 0c98da8b 2005-07-13 devnull 	u32int obno;
150 0c98da8b 2005-07-13 devnull 
151 0c98da8b 2005-07-13 devnull 	obno = bno;
152 0c98da8b 2005-07-13 devnull 	if(bno < NDIRBLOCKS){
153 0c98da8b 2005-07-13 devnull 		if(debug)
154 0c98da8b 2005-07-13 devnull 			fprint(2, "fileblock %d -> %d...", 
155 0c98da8b 2005-07-13 devnull 				bno, ino->block[bno]);
156 0c98da8b 2005-07-13 devnull 		return ext2datablock(fs, ino->block[bno], size);
157 0c98da8b 2005-07-13 devnull 	}
158 0c98da8b 2005-07-13 devnull 	bno -= NDIRBLOCKS;
159 0c98da8b 2005-07-13 devnull 	ppb = fs->blocksize/4;
160 0c98da8b 2005-07-13 devnull 
161 0c98da8b 2005-07-13 devnull 	/* one indirect */
162 0c98da8b 2005-07-13 devnull 	if(bno < ppb){
163 0c98da8b 2005-07-13 devnull 		b = ext2datablock(fs, ino->block[INDBLOCK], fs->blocksize);
164 0c98da8b 2005-07-13 devnull 		if(b == nil)
165 0c98da8b 2005-07-13 devnull 			return nil;
166 0c98da8b 2005-07-13 devnull 		a = (u32int*)b->data;
167 0c98da8b 2005-07-13 devnull 		bno = a[bno%ppb];
168 0c98da8b 2005-07-13 devnull 		blockput(b);
169 0c98da8b 2005-07-13 devnull 		return ext2datablock(fs, bno, size);
170 0c98da8b 2005-07-13 devnull 	}
171 0c98da8b 2005-07-13 devnull 	bno -= ppb;
172 0c98da8b 2005-07-13 devnull 
173 0c98da8b 2005-07-13 devnull 	/* one double indirect */
174 0c98da8b 2005-07-13 devnull 	if(bno < ppb*ppb){
175 0c98da8b 2005-07-13 devnull 		b = ext2datablock(fs, ino->block[DINDBLOCK], fs->blocksize);
176 0c98da8b 2005-07-13 devnull 		if(b == nil)
177 0c98da8b 2005-07-13 devnull 			return nil;
178 0c98da8b 2005-07-13 devnull 		a = (u32int*)b->data;
179 0c98da8b 2005-07-13 devnull 		bno = a[(bno/ppb)%ppb];
180 0c98da8b 2005-07-13 devnull 		blockput(b);
181 0c98da8b 2005-07-13 devnull 		b = ext2datablock(fs, bno, fs->blocksize);
182 0c98da8b 2005-07-13 devnull 		if(b == nil)
183 0c98da8b 2005-07-13 devnull 			return nil;
184 0c98da8b 2005-07-13 devnull 		a = (u32int*)b->data;
185 0c98da8b 2005-07-13 devnull 		bno = a[bno%ppb];
186 0c98da8b 2005-07-13 devnull 		blockput(b);
187 0c98da8b 2005-07-13 devnull 		return ext2datablock(fs, bno, size);
188 0c98da8b 2005-07-13 devnull 	}
189 0c98da8b 2005-07-13 devnull 	bno -= ppb*ppb;
190 0c98da8b 2005-07-13 devnull 
191 0c98da8b 2005-07-13 devnull 	/* one triple indirect */
192 0c98da8b 2005-07-13 devnull 	if(bno < ppb*ppb*ppb){
193 0c98da8b 2005-07-13 devnull 		b = ext2datablock(fs, ino->block[TINDBLOCK], fs->blocksize);
194 0c98da8b 2005-07-13 devnull 		if(b == nil)
195 0c98da8b 2005-07-13 devnull 			return nil;
196 0c98da8b 2005-07-13 devnull 		a = (u32int*)b->data;
197 0c98da8b 2005-07-13 devnull 		bno = a[(bno/(ppb*ppb))%ppb];
198 0c98da8b 2005-07-13 devnull 		blockput(b);
199 0c98da8b 2005-07-13 devnull 		b = ext2datablock(fs, bno, fs->blocksize);
200 0c98da8b 2005-07-13 devnull 		if(b == nil)
201 0c98da8b 2005-07-13 devnull 			return nil;
202 0c98da8b 2005-07-13 devnull 		a = (u32int*)b->data;
203 0c98da8b 2005-07-13 devnull 		bno = a[(bno/ppb)%ppb];
204 0c98da8b 2005-07-13 devnull 		blockput(b);
205 0c98da8b 2005-07-13 devnull 		b = ext2datablock(fs, bno, fs->blocksize);
206 0c98da8b 2005-07-13 devnull 		if(b == nil)
207 0c98da8b 2005-07-13 devnull 			return nil;
208 0c98da8b 2005-07-13 devnull 		a = (u32int*)b->data;
209 0c98da8b 2005-07-13 devnull 		bno = a[bno%ppb];
210 0c98da8b 2005-07-13 devnull 		blockput(b);
211 0c98da8b 2005-07-13 devnull 		return ext2datablock(fs, bno, size);
212 0c98da8b 2005-07-13 devnull 	}
213 0c98da8b 2005-07-13 devnull 
214 0c98da8b 2005-07-13 devnull 	fprint(2, "ext2fileblock %llud: too big\n", obno);
215 0c98da8b 2005-07-13 devnull 	return nil;
216 0c98da8b 2005-07-13 devnull }
217 0c98da8b 2005-07-13 devnull 
218 0c98da8b 2005-07-13 devnull static int
219 0c98da8b 2005-07-13 devnull checksuper(Super *super)
220 0c98da8b 2005-07-13 devnull {
221 0c98da8b 2005-07-13 devnull 	if(super->magic != SUPERMAGIC){
222 0c98da8b 2005-07-13 devnull 		werrstr("bad magic 0x%ux wanted 0x%ux", super->magic, SUPERMAGIC);
223 0c98da8b 2005-07-13 devnull 		return -1;
224 0c98da8b 2005-07-13 devnull 	}
225 0c98da8b 2005-07-13 devnull 	return 0;
226 0c98da8b 2005-07-13 devnull }
227 0c98da8b 2005-07-13 devnull 
228 0c98da8b 2005-07-13 devnull static int
229 0c98da8b 2005-07-13 devnull ext2sync(Fsys *fsys)
230 0c98da8b 2005-07-13 devnull {
231 0c98da8b 2005-07-13 devnull 	int i;
232 0c98da8b 2005-07-13 devnull 	Group *g;
233 0c98da8b 2005-07-13 devnull 	Block *b;
234 0c98da8b 2005-07-13 devnull 	Super *super;
235 0c98da8b 2005-07-13 devnull 	Ext2 *fs;
236 0c98da8b 2005-07-13 devnull 	Disk *disk;
237 0c98da8b 2005-07-13 devnull 
238 0c98da8b 2005-07-13 devnull 	fs = fsys->priv;
239 0c98da8b 2005-07-13 devnull 	disk = fs->disk;
240 0c98da8b 2005-07-13 devnull 	if((b = diskread(disk, SBSIZE, SBOFF)) == nil)
241 0c98da8b 2005-07-13 devnull 		goto error;
242 0c98da8b 2005-07-13 devnull 	super = (Super*)b->data;
243 0c98da8b 2005-07-13 devnull 	if(checksuper(super) < 0)
244 0c98da8b 2005-07-13 devnull 		goto error;
245 0c98da8b 2005-07-13 devnull 	fs->blocksize = MINBLOCKSIZE<<super->logblocksize;
246 0c98da8b 2005-07-13 devnull 	fs->nblock = super->nblock;
247 0c98da8b 2005-07-13 devnull 	fs->ngroup = (super->nblock+super->blockspergroup-1)
248 0c98da8b 2005-07-13 devnull 		/ super->blockspergroup;
249 0c98da8b 2005-07-13 devnull 	fs->inospergroup = super->inospergroup;
250 0c98da8b 2005-07-13 devnull 	fs->blockspergroup = super->blockspergroup;
251 0c98da8b 2005-07-13 devnull 	fs->inosperblock = fs->blocksize / InodeSize;
252 0c98da8b 2005-07-13 devnull 	if(fs->blocksize == SBOFF)
253 0c98da8b 2005-07-13 devnull 		fs->groupaddr = 2;
254 0c98da8b 2005-07-13 devnull 	else
255 0c98da8b 2005-07-13 devnull 		fs->groupaddr = 1;
256 0c98da8b 2005-07-13 devnull 	fs->descperblock = fs->blocksize / GroupSize;
257 0c98da8b 2005-07-13 devnull 	fs->firstblock = super->firstdatablock;
258 0c98da8b 2005-07-13 devnull 	blockput(b);
259 0c98da8b 2005-07-13 devnull 
260 0c98da8b 2005-07-13 devnull 	fsys->blocksize = fs->blocksize;
261 0c98da8b 2005-07-13 devnull 	fsys->nblock = fs->nblock;
262 0c98da8b 2005-07-13 devnull 	fprint(2, "ext2 %d %d-byte blocks, first data block %d, %d groups of %d\n",
263 0c98da8b 2005-07-13 devnull 		fs->nblock, fs->blocksize, fs->firstblock, fs->ngroup, fs->blockspergroup);
264 0c98da8b 2005-07-13 devnull 
265 0c98da8b 2005-07-13 devnull 	if(0){
266 0c98da8b 2005-07-13 devnull 		for(i=0; i<fs->ngroup; i++)
267 0c98da8b 2005-07-13 devnull 			if((g = ext2group(fs, i, &b)) != nil){
268 0c98da8b 2005-07-13 devnull 				fprint(2, "grp %d: bitblock=%d\n", i, g->bitblock);
269 0c98da8b 2005-07-13 devnull 				blockput(b);
270 0c98da8b 2005-07-13 devnull 			}
271 0c98da8b 2005-07-13 devnull 	}
272 0c98da8b 2005-07-13 devnull 	return 0;
273 0c98da8b 2005-07-13 devnull 
274 0c98da8b 2005-07-13 devnull error:
275 0c98da8b 2005-07-13 devnull 	blockput(b);
276 0c98da8b 2005-07-13 devnull 	return -1;
277 0c98da8b 2005-07-13 devnull }
278 0c98da8b 2005-07-13 devnull 
279 0c98da8b 2005-07-13 devnull static void
280 0c98da8b 2005-07-13 devnull mkhandle(Nfs3Handle *h, u64int ino)
281 0c98da8b 2005-07-13 devnull {
282 0c98da8b 2005-07-13 devnull 	h->h[0] = ino>>24;
283 0c98da8b 2005-07-13 devnull 	h->h[1] = ino>>16;
284 0c98da8b 2005-07-13 devnull 	h->h[2] = ino>>8;
285 0c98da8b 2005-07-13 devnull 	h->h[3] = ino;
286 0c98da8b 2005-07-13 devnull 	h->len = 4;
287 0c98da8b 2005-07-13 devnull }
288 0c98da8b 2005-07-13 devnull 
289 0c98da8b 2005-07-13 devnull static u32int
290 0c98da8b 2005-07-13 devnull byte2u32(uchar *p)
291 0c98da8b 2005-07-13 devnull {
292 0c98da8b 2005-07-13 devnull 	return (p[0]<<24) | (p[1]<<16) | (p[2]<<8) | p[3];
293 0c98da8b 2005-07-13 devnull }
294 0c98da8b 2005-07-13 devnull 
295 0c98da8b 2005-07-13 devnull static Nfs3Status
296 0c98da8b 2005-07-13 devnull handle2ino(Ext2 *fs, Nfs3Handle *h, u32int *pinum, Inode *ino)
297 0c98da8b 2005-07-13 devnull {
298 0c98da8b 2005-07-13 devnull 	int i;
299 0c98da8b 2005-07-13 devnull 	uint ioff;
300 0c98da8b 2005-07-13 devnull 	u32int inum;
301 0c98da8b 2005-07-13 devnull 	u32int addr;
302 0c98da8b 2005-07-13 devnull 	Block *gb, *b;
303 0c98da8b 2005-07-13 devnull 	Group *g;
304 0c98da8b 2005-07-13 devnull 
305 0c98da8b 2005-07-13 devnull 	if(h->len != 4)
306 0c98da8b 2005-07-13 devnull 		return Nfs3ErrBadHandle;
307 0c98da8b 2005-07-13 devnull 	inum = byte2u32(h->h);
308 0c98da8b 2005-07-13 devnull 	if(pinum)
309 0c98da8b 2005-07-13 devnull 		*pinum = inum;
310 0c98da8b 2005-07-13 devnull 	i = (inum-1) / fs->inospergroup;
311 0c98da8b 2005-07-13 devnull 	if(i >= fs->ngroup)
312 0c98da8b 2005-07-13 devnull 		return Nfs3ErrBadHandle;
313 0c98da8b 2005-07-13 devnull 	ioff = (inum-1) % fs->inospergroup;
314 0c98da8b 2005-07-13 devnull 	if((g = ext2group(fs, i, &gb)) == nil)
315 0c98da8b 2005-07-13 devnull 		return Nfs3ErrIo;
316 0c98da8b 2005-07-13 devnull 	addr = g->inodeaddr + ioff/fs->inosperblock;
317 0c98da8b 2005-07-13 devnull 	blockput(gb);
318 0c98da8b 2005-07-13 devnull 	if((b = diskread(fs->disk, fs->blocksize, (u64int)addr*fs->blocksize)) == nil)
319 0c98da8b 2005-07-13 devnull 		return Nfs3ErrIo;
320 0c98da8b 2005-07-13 devnull 	*ino = ((Inode*)b->data)[ioff%fs->inosperblock];
321 0c98da8b 2005-07-13 devnull 	blockput(b);
322 0c98da8b 2005-07-13 devnull 	return Nfs3Ok;
323 0c98da8b 2005-07-13 devnull }
324 0c98da8b 2005-07-13 devnull 
325 0c98da8b 2005-07-13 devnull static Nfs3Status
326 0c98da8b 2005-07-13 devnull ext2root(Fsys *fsys, Nfs3Handle *h)
327 0c98da8b 2005-07-13 devnull {
328 0c98da8b 2005-07-13 devnull 	mkhandle(h, ROOTINODE);
329 0c98da8b 2005-07-13 devnull 	return Nfs3Ok;
330 0c98da8b 2005-07-13 devnull }
331 0c98da8b 2005-07-13 devnull 
332 0c98da8b 2005-07-13 devnull static Nfs3Status
333 0c98da8b 2005-07-13 devnull ino2attr(Ext2 *fs, Inode *ino, u32int inum, Nfs3Attr *attr)
334 0c98da8b 2005-07-13 devnull {
335 0c98da8b 2005-07-13 devnull 	u32int rdev;
336 0c98da8b 2005-07-13 devnull 
337 0c98da8b 2005-07-13 devnull 	attr->type = -1;
338 0c98da8b 2005-07-13 devnull 	switch(ino->mode&IFMT){
339 0c98da8b 2005-07-13 devnull 	case IFIFO:
340 0c98da8b 2005-07-13 devnull 		attr->type = Nfs3FileFifo;
341 0c98da8b 2005-07-13 devnull 		break;
342 0c98da8b 2005-07-13 devnull 	case IFCHR:
343 0c98da8b 2005-07-13 devnull 		attr->type = Nfs3FileChar;
344 0c98da8b 2005-07-13 devnull 		break;
345 0c98da8b 2005-07-13 devnull 	case IFDIR:
346 0c98da8b 2005-07-13 devnull 		attr->type = Nfs3FileDir;
347 0c98da8b 2005-07-13 devnull 		break;
348 0c98da8b 2005-07-13 devnull 	case IFBLK:
349 0c98da8b 2005-07-13 devnull 		attr->type = Nfs3FileBlock;
350 0c98da8b 2005-07-13 devnull 		break;
351 0c98da8b 2005-07-13 devnull 	case IFREG:
352 0c98da8b 2005-07-13 devnull 		attr->type = Nfs3FileReg;
353 0c98da8b 2005-07-13 devnull 		break;
354 0c98da8b 2005-07-13 devnull 	case IFLNK:
355 0c98da8b 2005-07-13 devnull 		attr->type = Nfs3FileSymlink;
356 0c98da8b 2005-07-13 devnull 		break;
357 0c98da8b 2005-07-13 devnull 	case IFSOCK:
358 0c98da8b 2005-07-13 devnull 		attr->type = Nfs3FileSocket;
359 0c98da8b 2005-07-13 devnull 		break;
360 0c98da8b 2005-07-13 devnull 	case IFWHT:
361 0c98da8b 2005-07-13 devnull 	default:
362 0c98da8b 2005-07-13 devnull 		return Nfs3ErrBadHandle;
363 0c98da8b 2005-07-13 devnull 	}
364 0c98da8b 2005-07-13 devnull 
365 0c98da8b 2005-07-13 devnull 	attr->mode = ino->mode&07777;
366 0c98da8b 2005-07-13 devnull 	attr->nlink = ino->nlink;
367 0c98da8b 2005-07-13 devnull 	attr->uid = ino->uid;
368 0c98da8b 2005-07-13 devnull 	attr->gid = ino->gid;
369 0c98da8b 2005-07-13 devnull 	attr->size = ino->size;
370 0c98da8b 2005-07-13 devnull 	attr->used = ino->nblock*fs->blocksize;
371 0c98da8b 2005-07-13 devnull 	if(attr->type==Nfs3FileBlock || attr->type==Nfs3FileChar){
372 0c98da8b 2005-07-13 devnull 		rdev = ino->block[0];
373 0c98da8b 2005-07-13 devnull 		attr->major = (rdev>>8)&0xFF;
374 0c98da8b 2005-07-13 devnull 		attr->minor = rdev & 0xFFFF00FF;
375 0c98da8b 2005-07-13 devnull 	}else{
376 0c98da8b 2005-07-13 devnull 		attr->major = 0;
377 0c98da8b 2005-07-13 devnull 		attr->minor = 0;
378 0c98da8b 2005-07-13 devnull 	}
379 0c98da8b 2005-07-13 devnull 	attr->fsid = 0;
380 0c98da8b 2005-07-13 devnull 	attr->fileid = inum;
381 0c98da8b 2005-07-13 devnull 	attr->atime.sec = ino->atime;
382 0c98da8b 2005-07-13 devnull 	attr->atime.nsec = 0;
383 0c98da8b 2005-07-13 devnull 	attr->mtime.sec = ino->mtime;
384 0c98da8b 2005-07-13 devnull 	attr->mtime.nsec = 0;
385 0c98da8b 2005-07-13 devnull 	attr->ctime.sec = ino->ctime;
386 0c98da8b 2005-07-13 devnull 	attr->ctime.nsec = 0;
387 0c98da8b 2005-07-13 devnull 	return Nfs3Ok;
388 0c98da8b 2005-07-13 devnull }
389 0c98da8b 2005-07-13 devnull 
390 0c98da8b 2005-07-13 devnull static int
391 0c98da8b 2005-07-13 devnull ingroup(SunAuthUnix *au, uint gid)
392 0c98da8b 2005-07-13 devnull {
393 0c98da8b 2005-07-13 devnull 	int i;
394 0c98da8b 2005-07-13 devnull 
395 0c98da8b 2005-07-13 devnull 	for(i=0; i<au->ng; i++)
396 0c98da8b 2005-07-13 devnull 		if(au->g[i] == gid)
397 0c98da8b 2005-07-13 devnull 			return 1;
398 0c98da8b 2005-07-13 devnull 	return 0;
399 0c98da8b 2005-07-13 devnull }
400 0c98da8b 2005-07-13 devnull 
401 0c98da8b 2005-07-13 devnull static Nfs3Status
402 0c98da8b 2005-07-13 devnull inoperm(Inode *ino, SunAuthUnix *au, int need)
403 0c98da8b 2005-07-13 devnull {
404 0c98da8b 2005-07-13 devnull 	int have;
405 0c98da8b 2005-07-13 devnull 
406 0c98da8b 2005-07-13 devnull 	if(allowall)
407 0c98da8b 2005-07-13 devnull 		return Nfs3Ok;
408 0c98da8b 2005-07-13 devnull 
409 0c98da8b 2005-07-13 devnull 	have = ino->mode&0777;
410 0c98da8b 2005-07-13 devnull 	if(ino->uid == au->uid)
411 0c98da8b 2005-07-13 devnull 		have >>= 6;
412 0c98da8b 2005-07-13 devnull 	else if(ino->gid == au->gid || ingroup(au, ino->gid))
413 0c98da8b 2005-07-13 devnull 		have >>= 3;
414 0c98da8b 2005-07-13 devnull 
415 0c98da8b 2005-07-13 devnull 	if((have&need) != need)
416 0c98da8b 2005-07-13 devnull 		return Nfs3ErrNotOwner;	/* really EPERM */
417 0c98da8b 2005-07-13 devnull 	return Nfs3Ok;
418 0c98da8b 2005-07-13 devnull }
419 0c98da8b 2005-07-13 devnull 
420 0c98da8b 2005-07-13 devnull static Nfs3Status
421 0c98da8b 2005-07-13 devnull ext2getattr(Fsys *fsys, SunAuthUnix *au, Nfs3Handle *h, Nfs3Attr *attr)
422 0c98da8b 2005-07-13 devnull {
423 0c98da8b 2005-07-13 devnull 	Inode ino;
424 0c98da8b 2005-07-13 devnull 	u32int inum;
425 0c98da8b 2005-07-13 devnull 	Ext2 *fs;
426 0c98da8b 2005-07-13 devnull 	Nfs3Status ok;
427 0c98da8b 2005-07-13 devnull 
428 0c98da8b 2005-07-13 devnull 	fs = fsys->priv;
429 0c98da8b 2005-07-13 devnull 	if((ok = handle2ino(fs, h, &inum, &ino)) != Nfs3Ok)
430 0c98da8b 2005-07-13 devnull 		return ok;
431 0c98da8b 2005-07-13 devnull 
432 0c98da8b 2005-07-13 devnull 	USED(au);	/* anyone can getattr */
433 0c98da8b 2005-07-13 devnull 	return ino2attr(fs, &ino, inum, attr);
434 0c98da8b 2005-07-13 devnull }
435 0c98da8b 2005-07-13 devnull 
436 0c98da8b 2005-07-13 devnull static Nfs3Status
437 0c98da8b 2005-07-13 devnull ext2access(Fsys *fsys, SunAuthUnix *au, Nfs3Handle *h, u32int want, u32int *got, Nfs3Attr *attr)
438 0c98da8b 2005-07-13 devnull {
439 0c98da8b 2005-07-13 devnull 	int have;
440 0c98da8b 2005-07-13 devnull 	Inode ino;
441 0c98da8b 2005-07-13 devnull 	u32int inum;
442 0c98da8b 2005-07-13 devnull 	Ext2 *fs;
443 0c98da8b 2005-07-13 devnull 	Nfs3Status ok;
444 0c98da8b 2005-07-13 devnull 
445 0c98da8b 2005-07-13 devnull 	fs = fsys->priv;
446 0c98da8b 2005-07-13 devnull 	if((ok = handle2ino(fs, h, &inum, &ino)) != Nfs3Ok)
447 0c98da8b 2005-07-13 devnull 		return ok;
448 0c98da8b 2005-07-13 devnull 
449 0c98da8b 2005-07-13 devnull 	have = ino.mode&0777;
450 0c98da8b 2005-07-13 devnull 	if(ino.uid == au->uid)
451 0c98da8b 2005-07-13 devnull 		have >>= 6;
452 0c98da8b 2005-07-13 devnull 	else if(ino.gid == au->gid || ingroup(au, ino.gid))
453 0c98da8b 2005-07-13 devnull 		have >>= 3;
454 0c98da8b 2005-07-13 devnull 
455 0c98da8b 2005-07-13 devnull 	*got = 0;
456 0c98da8b 2005-07-13 devnull 	if((want&Nfs3AccessRead) && (have&AREAD))
457 0c98da8b 2005-07-13 devnull 		*got |= Nfs3AccessRead;
458 0c98da8b 2005-07-13 devnull 	if((want&Nfs3AccessLookup) && (ino.mode&IFMT)==IFDIR && (have&AEXEC))
459 0c98da8b 2005-07-13 devnull 		*got |= Nfs3AccessLookup;
460 0c98da8b 2005-07-13 devnull 	if((want&Nfs3AccessExecute) && (ino.mode&IFMT)!=IFDIR && (have&AEXEC))
461 0c98da8b 2005-07-13 devnull 		*got |= Nfs3AccessExecute;
462 0c98da8b 2005-07-13 devnull 
463 0c98da8b 2005-07-13 devnull 	return ino2attr(fs, &ino, inum, attr);
464 0c98da8b 2005-07-13 devnull }
465 0c98da8b 2005-07-13 devnull 
466 0c98da8b 2005-07-13 devnull static Nfs3Status
467 0c98da8b 2005-07-13 devnull ext2lookup(Fsys *fsys, SunAuthUnix *au, Nfs3Handle *h, char *name, Nfs3Handle *nh)
468 0c98da8b 2005-07-13 devnull {
469 0c98da8b 2005-07-13 devnull 	u32int nblock;
470 0c98da8b 2005-07-13 devnull 	u32int i;
471 0c98da8b 2005-07-13 devnull 	uchar *p, *ep;
472 0c98da8b 2005-07-13 devnull 	Dirent *de;
473 0c98da8b 2005-07-13 devnull 	Inode ino;
474 0c98da8b 2005-07-13 devnull 	Block *b;
475 0c98da8b 2005-07-13 devnull 	Ext2 *fs;
476 0c98da8b 2005-07-13 devnull 	Nfs3Status ok;
477 0c98da8b 2005-07-13 devnull 	int len, want;
478 0c98da8b 2005-07-13 devnull 
479 0c98da8b 2005-07-13 devnull 	fs = fsys->priv;
480 0c98da8b 2005-07-13 devnull 	if((ok = handle2ino(fs, h, nil, &ino)) != Nfs3Ok)
481 0c98da8b 2005-07-13 devnull 		return ok;
482 0c98da8b 2005-07-13 devnull 
483 0c98da8b 2005-07-13 devnull 	if((ino.mode&IFMT) != IFDIR)
484 0c98da8b 2005-07-13 devnull 		return Nfs3ErrNotDir;
485 0c98da8b 2005-07-13 devnull 
486 0c98da8b 2005-07-13 devnull 	if((ok = inoperm(&ino, au, AEXEC)) != Nfs3Ok)
487 0c98da8b 2005-07-13 devnull 		return ok;
488 0c98da8b 2005-07-13 devnull 
489 0c98da8b 2005-07-13 devnull 	len = strlen(name);
490 0c98da8b 2005-07-13 devnull 	nblock = (ino.size+fs->blocksize-1) / fs->blocksize;
491 0c98da8b 2005-07-13 devnull 	if(debug) fprint(2, "%d blocks in dir...", nblock);
492 0c98da8b 2005-07-13 devnull 	for(i=0; i<nblock; i++){
493 0c98da8b 2005-07-13 devnull 		if(i==nblock-1)
494 0c98da8b 2005-07-13 devnull 			want = ino.size % fs->blocksize;
495 0c98da8b 2005-07-13 devnull 		else
496 0c98da8b 2005-07-13 devnull 			want = fs->blocksize;
497 0c98da8b 2005-07-13 devnull 		b = ext2fileblock(fs, &ino, i, want);
498 0c98da8b 2005-07-13 devnull 		if(b == nil){
499 0c98da8b 2005-07-13 devnull 			if(debug) fprint(2, "empty block...");
500 0c98da8b 2005-07-13 devnull 			continue;
501 0c98da8b 2005-07-13 devnull 		}
502 0c98da8b 2005-07-13 devnull 		p = b->data;
503 0c98da8b 2005-07-13 devnull 		ep = p+b->len;
504 0c98da8b 2005-07-13 devnull 		while(p < ep){
505 0c98da8b 2005-07-13 devnull 			de = (Dirent*)p;
506 0c98da8b 2005-07-13 devnull 			if(de->reclen == 0){
507 0c98da8b 2005-07-13 devnull 				if(debug)
508 0c98da8b 2005-07-13 devnull 					fprint(2, "reclen 0 at offset %d of %d\n", (int)(p-b->data), b->len);
509 0c98da8b 2005-07-13 devnull 				break;
510 0c98da8b 2005-07-13 devnull 			}
511 0c98da8b 2005-07-13 devnull 			p += de->reclen;
512 0c98da8b 2005-07-13 devnull 			if(p > ep){
513 0c98da8b 2005-07-13 devnull 				if(debug)
514 0c98da8b 2005-07-13 devnull 					fprint(2, "bad len %d at offset %d of %d\n", de->reclen, (int)(p-b->data), b->len);
515 0c98da8b 2005-07-13 devnull 				break;
516 0c98da8b 2005-07-13 devnull 			}
517 0c98da8b 2005-07-13 devnull 			if(de->ino == 0)
518 0c98da8b 2005-07-13 devnull 				continue;
519 0c98da8b 2005-07-13 devnull 			if(4+2+2+de->namlen > de->reclen){
520 0c98da8b 2005-07-13 devnull 				if(debug)
521 0c98da8b 2005-07-13 devnull 					fprint(2, "bad namelen %d at offset %d of %d\n", de->namlen, (int)(p-b->data), b->len);
522 0c98da8b 2005-07-13 devnull 				break;
523 0c98da8b 2005-07-13 devnull 			}
524 0c98da8b 2005-07-13 devnull 			if(de->namlen == len && memcmp(de->name, name, len) == 0){
525 0c98da8b 2005-07-13 devnull 				mkhandle(nh, de->ino);
526 0c98da8b 2005-07-13 devnull 				blockput(b);
527 0c98da8b 2005-07-13 devnull 				return Nfs3Ok;
528 0c98da8b 2005-07-13 devnull 			}
529 0c98da8b 2005-07-13 devnull 		}
530 0c98da8b 2005-07-13 devnull 		blockput(b);
531 0c98da8b 2005-07-13 devnull 	}
532 0c98da8b 2005-07-13 devnull 	return Nfs3ErrNoEnt;
533 0c98da8b 2005-07-13 devnull }
534 0c98da8b 2005-07-13 devnull 
535 0c98da8b 2005-07-13 devnull static Nfs3Status
536 0c98da8b 2005-07-13 devnull ext2readdir(Fsys *fsys, SunAuthUnix *au, Nfs3Handle *h, u32int count, u64int cookie, uchar **pdata, u32int *pcount, u1int *peof)
537 0c98da8b 2005-07-13 devnull {
538 0c98da8b 2005-07-13 devnull 	u32int nblock;
539 0c98da8b 2005-07-13 devnull 	u32int i;
540 0c98da8b 2005-07-13 devnull 	int off, done;
541 0c98da8b 2005-07-13 devnull 	uchar *data, *dp, *dep, *p, *ep, *ndp;
542 0c98da8b 2005-07-13 devnull 	Dirent *de;
543 0c98da8b 2005-07-13 devnull 	Inode ino;
544 0c98da8b 2005-07-13 devnull 	Block *b;
545 0c98da8b 2005-07-13 devnull 	Ext2 *fs;
546 0c98da8b 2005-07-13 devnull 	Nfs3Status ok;
547 0c98da8b 2005-07-13 devnull 	Nfs3Entry e;
548 0c98da8b 2005-07-13 devnull 	int want;
549 0c98da8b 2005-07-13 devnull 
550 0c98da8b 2005-07-13 devnull 	fs = fsys->priv;
551 0c98da8b 2005-07-13 devnull 	if((ok = handle2ino(fs, h, nil, &ino)) != Nfs3Ok)
552 0c98da8b 2005-07-13 devnull 		return ok;
553 0c98da8b 2005-07-13 devnull 
554 0c98da8b 2005-07-13 devnull 	if((ino.mode&IFMT) != IFDIR)
555 0c98da8b 2005-07-13 devnull 		return Nfs3ErrNotDir;
556 0c98da8b 2005-07-13 devnull 
557 0c98da8b 2005-07-13 devnull 	if((ok = inoperm(&ino, au, AREAD)) != Nfs3Ok)
558 0c98da8b 2005-07-13 devnull 		return ok;
559 0c98da8b 2005-07-13 devnull 
560 0c98da8b 2005-07-13 devnull 	if(cookie >= ino.size){
561 0c98da8b 2005-07-13 devnull 		*pcount = 0;
562 0c98da8b 2005-07-13 devnull 		*pdata = 0;
563 0c98da8b 2005-07-13 devnull 		return Nfs3Ok;
564 0c98da8b 2005-07-13 devnull 	}
565 0c98da8b 2005-07-13 devnull 
566 0c98da8b 2005-07-13 devnull 	dp = malloc(count);
567 0c98da8b 2005-07-13 devnull 	data = dp;
568 0c98da8b 2005-07-13 devnull 	if(dp == nil)
569 0c98da8b 2005-07-13 devnull 		return Nfs3ErrNoMem;
570 0c98da8b 2005-07-13 devnull 	dep = dp+count;
571 0c98da8b 2005-07-13 devnull 	*peof = 0;
572 0c98da8b 2005-07-13 devnull 	nblock = (ino.size+fs->blocksize-1) / fs->blocksize;
573 0c98da8b 2005-07-13 devnull 	i = cookie/fs->blocksize;
574 0c98da8b 2005-07-13 devnull 	off = cookie%fs->blocksize;
575 0c98da8b 2005-07-13 devnull 	done = 0;
576 0c98da8b 2005-07-13 devnull 	for(; i<nblock && !done; i++){
577 0c98da8b 2005-07-13 devnull 		if(i==nblock-1)
578 0c98da8b 2005-07-13 devnull 			want = ino.size % fs->blocksize;
579 0c98da8b 2005-07-13 devnull 		else
580 0c98da8b 2005-07-13 devnull 			want = fs->blocksize;
581 0c98da8b 2005-07-13 devnull 		b = ext2fileblock(fs, &ino, i, want);
582 0c98da8b 2005-07-13 devnull 		if(b == nil)
583 0c98da8b 2005-07-13 devnull 			continue;
584 0c98da8b 2005-07-13 devnull 		p = b->data;
585 0c98da8b 2005-07-13 devnull 		ep = p+b->len;
586 0c98da8b 2005-07-13 devnull 		memset(&e, 0, sizeof e);
587 0c98da8b 2005-07-13 devnull 		while(p < ep){
588 0c98da8b 2005-07-13 devnull 			de = (Dirent*)p;
589 0c98da8b 2005-07-13 devnull 			if(de->reclen == 0){
590 0c98da8b 2005-07-13 devnull 				if(debug) fprint(2, "reclen 0 at offset %d of %d\n", (int)(p-b->data), b->len);
591 0c98da8b 2005-07-13 devnull 				break;
592 0c98da8b 2005-07-13 devnull 			}
593 0c98da8b 2005-07-13 devnull 			p += de->reclen;
594 0c98da8b 2005-07-13 devnull 			if(p > ep){
595 0c98da8b 2005-07-13 devnull 				if(debug) fprint(2, "reclen %d at offset %d of %d\n", de->reclen, (int)(p-b->data), b->len);
596 0c98da8b 2005-07-13 devnull 				break;
597 0c98da8b 2005-07-13 devnull 			}
598 0c98da8b 2005-07-13 devnull 			if(de->ino == 0){
599 0c98da8b 2005-07-13 devnull 				if(debug) fprint(2, "zero inode\n");
600 0c98da8b 2005-07-13 devnull 				continue;
601 0c98da8b 2005-07-13 devnull 			}
602 0c98da8b 2005-07-13 devnull 			if(4+2+2+de->namlen > de->reclen){
603 0c98da8b 2005-07-13 devnull 				if(debug) fprint(2, "bad namlen %d reclen %d at offset %d of %d\n", de->namlen, de->reclen, (int)(p-b->data), b->len);
604 0c98da8b 2005-07-13 devnull 				break;
605 0c98da8b 2005-07-13 devnull 			}
606 0c98da8b 2005-07-13 devnull 			if(de->name[de->namlen] != 0){
607 0c98da8b 2005-07-13 devnull 				if(debug) fprint(2, "bad name %d %.*s\n", de->namlen, de->namlen, de->name);
608 0c98da8b 2005-07-13 devnull 				continue;
609 0c98da8b 2005-07-13 devnull 			}
610 0c98da8b 2005-07-13 devnull 			if(debug) print("%s/%d ", de->name, (int)de->ino);
611 0c98da8b 2005-07-13 devnull 			if((uchar*)de - b->data < off)
612 0c98da8b 2005-07-13 devnull 				continue;
613 0c98da8b 2005-07-13 devnull 			e.fileid = de->ino;
614 0c98da8b 2005-07-13 devnull 			e.name = de->name;
615 0c98da8b 2005-07-13 devnull 			e.cookie = (u64int)i*fs->blocksize + (p - b->data);
616 0c98da8b 2005-07-13 devnull 			if(nfs3entrypack(dp, dep, &ndp, &e) < 0){
617 0c98da8b 2005-07-13 devnull 				done = 1;
618 0c98da8b 2005-07-13 devnull 				break;
619 0c98da8b 2005-07-13 devnull 			}
620 0c98da8b 2005-07-13 devnull 			dp = ndp;
621 0c98da8b 2005-07-13 devnull 		}
622 0c98da8b 2005-07-13 devnull 		off = 0;
623 0c98da8b 2005-07-13 devnull 		blockput(b);
624 0c98da8b 2005-07-13 devnull 	}
625 0c98da8b 2005-07-13 devnull 	if(i==nblock)
626 0c98da8b 2005-07-13 devnull 		*peof = 1;
627 0c98da8b 2005-07-13 devnull 
628 0c98da8b 2005-07-13 devnull 	*pcount = dp - data;
629 0c98da8b 2005-07-13 devnull 	*pdata = data;
630 0c98da8b 2005-07-13 devnull 	return Nfs3Ok;
631 0c98da8b 2005-07-13 devnull }
632 0c98da8b 2005-07-13 devnull 
633 0c98da8b 2005-07-13 devnull static Nfs3Status
634 0c98da8b 2005-07-13 devnull ext2readfile(Fsys *fsys, SunAuthUnix *au, Nfs3Handle *h, u32int count,
635 0c98da8b 2005-07-13 devnull 	u64int offset, uchar **pdata, u32int *pcount, u1int *peof)
636 0c98da8b 2005-07-13 devnull {
637 0c98da8b 2005-07-13 devnull 	uchar *data;
638 0c98da8b 2005-07-13 devnull 	Block *b;
639 0c98da8b 2005-07-13 devnull 	Ext2 *fs;
640 0c98da8b 2005-07-13 devnull 	int off, want, fragcount;
641 0c98da8b 2005-07-13 devnull 	Inode ino;
642 0c98da8b 2005-07-13 devnull 	Nfs3Status ok;
643 0c98da8b 2005-07-13 devnull 
644 0c98da8b 2005-07-13 devnull 	fs = fsys->priv;
645 0c98da8b 2005-07-13 devnull 	if((ok = handle2ino(fs, h, nil, &ino)) != Nfs3Ok)
646 0c98da8b 2005-07-13 devnull 		return ok;
647 0c98da8b 2005-07-13 devnull 
648 0c98da8b 2005-07-13 devnull 	if((ok = inoperm(&ino, au, AREAD)) != Nfs3Ok)
649 0c98da8b 2005-07-13 devnull 		return ok;
650 0c98da8b 2005-07-13 devnull 
651 0c98da8b 2005-07-13 devnull 	if(offset >= ino.size){
652 0c98da8b 2005-07-13 devnull 		*pdata = 0;
653 0c98da8b 2005-07-13 devnull 		*pcount = 0;
654 0c98da8b 2005-07-13 devnull 		*peof = 1;
655 0c98da8b 2005-07-13 devnull 		return Nfs3Ok;
656 0c98da8b 2005-07-13 devnull 	}
657 0c98da8b 2005-07-13 devnull 	if(offset+count > ino.size)
658 0c98da8b 2005-07-13 devnull 		count = ino.size-offset;
659 0c98da8b 2005-07-13 devnull 	if(offset/fs->blocksize != (offset+count-1)/fs->blocksize)
660 0c98da8b 2005-07-13 devnull 		count = fs->blocksize - offset%fs->blocksize;
661 0c98da8b 2005-07-13 devnull 
662 0c98da8b 2005-07-13 devnull 	data = malloc(count);
663 0c98da8b 2005-07-13 devnull 	if(data == nil)
664 0c98da8b 2005-07-13 devnull 		return Nfs3ErrNoMem;
665 0c98da8b 2005-07-13 devnull 
666 0c98da8b 2005-07-13 devnull 	want = offset%fs->blocksize+count;
667 0c98da8b 2005-07-13 devnull 	if(want%fs->blocksize)
668 0c98da8b 2005-07-13 devnull 		want += fs->blocksize - want%fs->blocksize;
669 0c98da8b 2005-07-13 devnull 
670 0c98da8b 2005-07-13 devnull 	b = ext2fileblock(fs, &ino, offset/fs->blocksize, want);
671 0c98da8b 2005-07-13 devnull 	if(b == nil){
672 0c98da8b 2005-07-13 devnull 		/* BUG: distinguish sparse file from I/O error */
673 0c98da8b 2005-07-13 devnull 		memset(data, 0, count);
674 0c98da8b 2005-07-13 devnull 	}else{
675 0c98da8b 2005-07-13 devnull 		off = offset%fs->blocksize;
676 0c98da8b 2005-07-13 devnull 		fragcount = count;	/* need signed variable */
677 0c98da8b 2005-07-13 devnull 		if(off+fragcount > b->len){
678 0c98da8b 2005-07-13 devnull 			fragcount = b->len - off;
679 0c98da8b 2005-07-13 devnull 			if(fragcount < 0)
680 0c98da8b 2005-07-13 devnull 				fragcount = 0;
681 0c98da8b 2005-07-13 devnull 		}
682 0c98da8b 2005-07-13 devnull 		if(fragcount > 0)
683 0c98da8b 2005-07-13 devnull 			memmove(data, b->data+off, fragcount);
684 0c98da8b 2005-07-13 devnull 		count = fragcount;
685 0c98da8b 2005-07-13 devnull 		blockput(b);
686 0c98da8b 2005-07-13 devnull 	}
687 0c98da8b 2005-07-13 devnull 	*peof = (offset+count == ino.size);
688 0c98da8b 2005-07-13 devnull 	*pcount = count;
689 0c98da8b 2005-07-13 devnull 	*pdata = data;
690 0c98da8b 2005-07-13 devnull 	return Nfs3Ok;
691 0c98da8b 2005-07-13 devnull }
692 0c98da8b 2005-07-13 devnull 
693 0c98da8b 2005-07-13 devnull static Nfs3Status
694 0c98da8b 2005-07-13 devnull ext2readlink(Fsys *fsys, SunAuthUnix *au, Nfs3Handle *h, char **link)
695 0c98da8b 2005-07-13 devnull {
696 0c98da8b 2005-07-13 devnull 	Ext2 *fs;
697 0c98da8b 2005-07-13 devnull 	Nfs3Status ok;
698 0c98da8b 2005-07-13 devnull 	int len;
699 0c98da8b 2005-07-13 devnull 	Inode ino;
700 0c98da8b 2005-07-13 devnull 	Block *b;
701 0c98da8b 2005-07-13 devnull 
702 0c98da8b 2005-07-13 devnull 	fs = fsys->priv;
703 0c98da8b 2005-07-13 devnull 	if((ok = handle2ino(fs, h, nil, &ino)) != Nfs3Ok)
704 0c98da8b 2005-07-13 devnull 		return ok;
705 0c98da8b 2005-07-13 devnull 	if((ok = inoperm(&ino, au, AREAD)) != Nfs3Ok)
706 0c98da8b 2005-07-13 devnull 		return ok;
707 0c98da8b 2005-07-13 devnull 
708 0c98da8b 2005-07-13 devnull 	if(ino.size > 1024)
709 0c98da8b 2005-07-13 devnull 		return Nfs3ErrIo;
710 0c98da8b 2005-07-13 devnull 	len = ino.size;
711 0c98da8b 2005-07-13 devnull 
712 0c98da8b 2005-07-13 devnull 	if(ino.nblock != 0){
713 0c98da8b 2005-07-13 devnull 		/* BUG: assumes symlink fits in one block */
714 0c98da8b 2005-07-13 devnull 		b = ext2fileblock(fs, &ino, 0, len);
715 0c98da8b 2005-07-13 devnull 		if(b == nil)
716 0c98da8b 2005-07-13 devnull 			return Nfs3ErrIo;
717 0c98da8b 2005-07-13 devnull 		if(memchr(b->data, 0, len) != nil){
718 0c98da8b 2005-07-13 devnull 			blockput(b);
719 0c98da8b 2005-07-13 devnull 			return Nfs3ErrIo;
720 0c98da8b 2005-07-13 devnull 		}
721 0c98da8b 2005-07-13 devnull 		*link = malloc(len+1);
722 0c98da8b 2005-07-13 devnull 		if(*link == 0){
723 0c98da8b 2005-07-13 devnull 			blockput(b);
724 0c98da8b 2005-07-13 devnull 			return Nfs3ErrNoMem;
725 0c98da8b 2005-07-13 devnull 		}
726 0c98da8b 2005-07-13 devnull 		memmove(*link, b->data, len);
727 0c98da8b 2005-07-13 devnull 		(*link)[len] = 0;
728 0c98da8b 2005-07-13 devnull 		blockput(b);
729 0c98da8b 2005-07-13 devnull 		return Nfs3Ok;
730 0c98da8b 2005-07-13 devnull 	}
731 0c98da8b 2005-07-13 devnull 
732 0c98da8b 2005-07-13 devnull 	if(len > sizeof ino.block)
733 0c98da8b 2005-07-13 devnull 		return Nfs3ErrIo;
734 0c98da8b 2005-07-13 devnull 
735 0c98da8b 2005-07-13 devnull 	*link = malloc(len+1);
736 0c98da8b 2005-07-13 devnull 	if(*link == 0)
737 0c98da8b 2005-07-13 devnull 		return Nfs3ErrNoMem;
738 0c98da8b 2005-07-13 devnull 	memmove(*link, ino.block, ino.size);
739 0c98da8b 2005-07-13 devnull 	(*link)[len] = 0;
740 0c98da8b 2005-07-13 devnull 	return Nfs3Ok;
741 0c98da8b 2005-07-13 devnull }
742 0c98da8b 2005-07-13 devnull