2 * Copyright 2000, International Business Machines Corporation and others.
5 * This software has been released under the terms of the IBM Public
6 * License. For details, see the LICENSE file in the top-level source
7 * directory or online at http://www.openafs.org/dl/license10.html
11 * Linux specific vnodeops. Also includes the glue routines required to call
12 * AFS vnodeops. The "NOTUSED" #define is used to indicate routines and
13 * calling sequences present in an ops table that we don't actually use.
14 * They are present solely for documentation purposes.
16 * So far the only truly scary part is that Linux relies on the inode cache
17 * to be up to date. Don't you dare break a callback and expect an fstat
18 * to give you meaningful information. This appears to be fixed in the 2.1
19 * development kernels. As it is we can fix this now by intercepting the
23 #include "../afs/param.h"
24 #include "../afs/sysincludes.h"
25 #include "../afs/afsincludes.h"
26 #include "../afs/afs_stats.h"
28 #include "../h/pagemap.h"
29 #if defined(AFS_LINUX24_ENV)
30 #include "../h/smp_lock.h"
34 #define pageoff(pp) pgoff2loff((pp)->index)
36 #define pageoff(pp) pp->offset
39 extern struct vcache *afs_globalVp;
41 extern struct dentry_operations *afs_dops;
42 #if defined(AFS_LINUX24_ENV)
43 extern struct inode_operations afs_file_iops;
44 extern struct address_space_operations afs_file_aops;
45 struct address_space_operations afs_symlink_aops;
47 extern struct inode_operations afs_dir_iops;
48 extern struct inode_operations afs_symlink_iops;
52 static int afs_linux_lseek(struct inode *ip, struct file *fp, off_t, int) {}
55 static ssize_t afs_linux_read(struct file *fp, char *buf, size_t count,
59 struct vcache *vcp = (struct vcache*)fp->f_dentry->d_inode;
60 cred_t *credp = crref();
64 afs_Trace4(afs_iclSetp, CM_TRACE_READOP, ICL_TYPE_POINTER, vcp,
65 ICL_TYPE_INT32, (int)*offp,
66 ICL_TYPE_INT32, count,
67 ICL_TYPE_INT32, 99999);
69 /* get a validated vcache entry */
70 code = afs_InitReq(&treq, credp);
72 code = afs_VerifyVCache(vcp, &treq);
77 osi_FlushPages(vcp, credp); /* ensure stale pages are gone */
79 code = generic_file_read(fp, buf, count, offp);
83 afs_Trace4(afs_iclSetp, CM_TRACE_READOP, ICL_TYPE_POINTER, vcp,
84 ICL_TYPE_INT32, (int)*offp,
85 ICL_TYPE_INT32, count,
86 ICL_TYPE_INT32, code);
94 /* Now we have integrated VM for writes as well as reads. generic_file_write
95 * also takes care of re-positioning the pointer if file is open in append
96 * mode. Call fake open/close to ensure we do writes of core dumps.
98 static ssize_t afs_linux_write(struct file *fp, const char *buf, size_t count,
103 struct vcache *vcp = (struct vcache *)fp->f_dentry->d_inode;
104 struct vrequest treq;
105 cred_t *credp = crref();
109 afs_Trace4(afs_iclSetp, CM_TRACE_WRITEOP, ICL_TYPE_POINTER, vcp,
110 ICL_TYPE_INT32, (int)*offp, ICL_TYPE_INT32, count,
111 ICL_TYPE_INT32, (fp->f_flags & O_APPEND) ? 99998 : 99999);
114 /* get a validated vcache entry */
115 code = (ssize_t)afs_InitReq(&treq, credp);
117 code = (ssize_t)afs_VerifyVCache(vcp, &treq);
119 ObtainWriteLock(&vcp->lock, 529);
121 ReleaseWriteLock(&vcp->lock);
126 code = generic_file_write(fp, buf, count, offp);
130 ObtainWriteLock(&vcp->lock, 530);
131 vcp->m.Date = osi_Time(); /* set modification time */
132 afs_FakeClose(vcp, credp);
134 code2 = afs_DoPartialWrite(vcp, &treq);
135 if (code2 && code >=0)
136 code = (ssize_t) -code2;
137 ReleaseWriteLock(&vcp->lock);
139 afs_Trace4(afs_iclSetp, CM_TRACE_WRITEOP, ICL_TYPE_POINTER, vcp,
140 ICL_TYPE_INT32, (int)*offp, ICL_TYPE_INT32, count,
141 ICL_TYPE_INT32, code);
148 /* This is a complete rewrite of afs_readdir, since we can make use of
149 * filldir instead of afs_readdir_move. Note that changes to vcache/dcache
150 * handling and use of bulkstats will need to be reflected here as well.
152 static int afs_linux_readdir(struct file *fp,
153 void *dirbuf, filldir_t filldir)
155 extern struct DirEntry * afs_dir_GetBlob();
156 struct vcache *avc = (struct vcache*)FILE_INODE(fp);
157 struct vrequest treq;
158 register struct dcache *tdc;
166 cred_t *credp = crref();
169 AFS_STATCNT(afs_readdir);
171 code = afs_InitReq(&treq, credp);
178 /* update the cache entry */
180 code = afs_VerifyVCache(avc, &treq);
186 /* get a reference to the entire directory */
187 tdc = afs_GetDCache(avc, 0, &treq, &origOffset, &len, 1);
192 ObtainReadLock(&avc->lock);
194 * Make sure that the data in the cache is current. There are two
195 * cases we need to worry about:
196 * 1. The cache data is being fetched by another process.
197 * 2. The cache data is no longer valid
199 while ((avc->states & CStatd)
200 && (tdc->flags & DFFetching)
201 && hsame(avc->m.DataVersion, tdc->f.versionNo)) {
202 tdc->flags |= DFWaiting;
203 ReleaseReadLock(&avc->lock);
204 afs_osi_Sleep(&tdc->validPos);
205 ObtainReadLock(&avc->lock);
207 if (!(avc->states & CStatd)
208 || !hsame(avc->m.DataVersion, tdc->f.versionNo)) {
209 ReleaseReadLock(&avc->lock);
214 /* Fill in until we get an error or we're done. This implementation
215 * takes an offset in units of blobs, rather than bytes.
218 offset = (int)fp->f_pos;
220 dirpos = BlobScan(&tdc->f.inode, offset);
224 de = (struct DirEntry*)afs_dir_GetBlob(&tdc->f.inode, dirpos);
228 ino = (avc->fid.Fid.Volume << 16) + ntohl(de->fid.vnode);
229 ino &= 0x7fffffff; /* Assumes 32 bit ino_t ..... */
230 len = strlen(de->name);
232 /* filldir returns -EINVAL when the buffer is full. */
233 #ifdef AFS_LINUX24_ENV
234 code = (*filldir)(dirbuf, de->name, len, offset, ino, DT_DIR);
236 code = (*filldir)(dirbuf, de->name, len, offset, ino);
241 offset = dirpos + 1 + ((len+16)>>5);
243 /* If filldir didn't fill in the last one this is still pointing to that
246 fp->f_pos = (loff_t)offset;
249 ReleaseReadLock(&avc->lock);
255 int afs_linux_select(struct inode *ip, struct file *fp, int, select_table *);
258 /* in afs_pioctl.c */
259 extern int afs_xioctl(struct inode *ip, struct file *fp,
260 unsigned int com, unsigned long arg);
263 /* We need to detect unmap's after close. To do that, we need our own
264 * vm_operations_struct's. And we need to set them up for both the
265 * private and shared mappings. The fun part is that these are all static
266 * so we'll have to initialize on the fly!
268 static struct vm_operations_struct afs_private_mmap_ops;
269 static int afs_private_mmap_ops_inited = 0;
270 static struct vm_operations_struct afs_shared_mmap_ops;
271 static int afs_shared_mmap_ops_inited = 0;
273 void afs_linux_vma_close(struct vm_area_struct *vmap)
281 vcp = (struct vcache*)FILE_INODE(vmap->vm_file);
286 afs_Trace4(afs_iclSetp, CM_TRACE_VM_CLOSE,
287 ICL_TYPE_POINTER, vcp,
288 ICL_TYPE_INT32, vcp->mapcnt,
289 ICL_TYPE_INT32, vcp->opens,
290 ICL_TYPE_INT32, vcp->execsOrWriters);
291 ObtainWriteLock(&vcp->lock, 532);
294 ReleaseWriteLock(&vcp->lock);
297 (void) afs_close(vcp, vmap->vm_file->f_flags, credp);
298 /* only decrement the execsOrWriters flag if this is not a writable
300 if (! (vmap->vm_file->f_flags & (FWRITE | FTRUNC)))
301 vcp->execsOrWriters--;
303 vcp->states &= ~CMAPPED;
308 ReleaseWriteLock(&vcp->lock);
315 static int afs_linux_mmap(struct file *fp, struct vm_area_struct *vmap)
317 struct vcache *vcp = (struct vcache*)FILE_INODE(fp);
318 cred_t *credp = crref();
319 struct vrequest treq;
323 #if defined(AFS_LINUX24_ENV)
324 afs_Trace3(afs_iclSetp, CM_TRACE_GMAP, ICL_TYPE_POINTER, vcp,
325 ICL_TYPE_POINTER, vmap->vm_start,
326 ICL_TYPE_INT32, vmap->vm_end - vmap->vm_start);
328 afs_Trace4(afs_iclSetp, CM_TRACE_GMAP, ICL_TYPE_POINTER, vcp,
329 ICL_TYPE_POINTER, vmap->vm_start,
330 ICL_TYPE_INT32, vmap->vm_end - vmap->vm_start,
331 ICL_TYPE_INT32, vmap->vm_offset);
334 /* get a validated vcache entry */
335 code = afs_InitReq(&treq, credp);
337 code = afs_VerifyVCache(vcp, &treq);
343 osi_FlushPages(vcp, credp); /* ensure stale pages are gone */
346 code = generic_file_mmap(fp, vmap);
351 ObtainWriteLock(&vcp->lock,531);
352 /* Set out vma ops so we catch the close. The following test should be
353 * the same as used in generic_file_mmap.
355 if ((vmap->vm_flags & VM_SHARED) && (vmap->vm_flags & VM_MAYWRITE)) {
356 if (!afs_shared_mmap_ops_inited) {
357 afs_shared_mmap_ops_inited = 1;
358 afs_shared_mmap_ops = *vmap->vm_ops;
359 afs_shared_mmap_ops.close = afs_linux_vma_close;
361 vmap->vm_ops = &afs_shared_mmap_ops;
364 if (!afs_private_mmap_ops_inited) {
365 afs_private_mmap_ops_inited = 1;
366 afs_private_mmap_ops = *vmap->vm_ops;
367 afs_private_mmap_ops.close = afs_linux_vma_close;
369 vmap->vm_ops = &afs_private_mmap_ops;
373 /* Add an open reference on the first mapping. */
374 if (vcp->mapcnt == 0) {
375 vcp->execsOrWriters++;
377 vcp->states |= CMAPPED;
379 ReleaseWriteLock(&vcp->lock);
388 int afs_linux_open(struct inode *ip, struct file *fp)
391 cred_t *credp = crref();
394 #ifdef AFS_LINUX24_ENV
397 code = afs_open((struct vcache**)&ip, fp->f_flags, credp);
398 #ifdef AFS_LINUX24_ENV
407 /* afs_Close is called from release, since release is used to handle all
408 * file closings. In addition afs_linux_flush is called from sys_close to
409 * handle flushing the data back to the server. The kicker is that we could
410 * ignore flush completely if only sys_close took it's return value from
411 * fput. See afs_linux_flush for notes on interactions between release and
414 static int afs_linux_release(struct inode *ip, struct file *fp)
417 cred_t *credp = crref();
418 struct vcache *vcp = (struct vcache*)ip;
421 #ifdef AFS_LINUX24_ENV
425 vcp->flushcnt--; /* protected by AFS global lock. */
428 code = afs_close(vcp, fp->f_flags, credp);
430 #ifdef AFS_LINUX24_ENV
439 #if defined(AFS_LINUX24_ENV)
440 static int afs_linux_fsync(struct file *fp, struct dentry *dp, int datasync)
442 static int afs_linux_fsync(struct file *fp, struct dentry *dp)
446 struct inode *ip = FILE_INODE(fp);
447 cred_t *credp = crref();
450 #ifdef AFS_LINUX24_ENV
453 code = afs_fsync((struct vcache*)ip, credp);
454 #ifdef AFS_LINUX24_ENV
464 /* No support for async i/o */
465 int afs_linux_fasync(struct inode *ip, struct file *fp, int);
467 /* I don't think it will, at least not as can be detected here. */
468 int afs_linux_check_media_change(kdev_t dev);
470 /* Revalidate media and file system. */
471 int afs_linux_file_revalidate(kdev_t dev);
474 static int afs_linux_lock(struct file *fp, int cmd, struct file_lock *flp)
477 struct vcache *vcp = (struct vcache*)FILE_INODE(fp);
478 cred_t *credp = crref();
481 /* Convert to a lock format afs_lockctl understands. */
482 memset((char*)&flock, 0, sizeof(flock));
483 flock.l_type = flp->fl_type;
484 flock.l_pid = flp->fl_pid;
486 flock.l_start = flp->fl_start;
487 flock.l_len = flp->fl_end - flp->fl_start;
490 code = afs_lockctl(vcp, &flock, cmd, credp);
498 * flush is called from sys_close. We could ignore it, but sys_close return
499 * code comes from flush, not release. We need to use release to keep
500 * the vcache open count correct. Note that flush is called before release
501 * (via fput) in sys_close. vcp->flushcnt is a bit of ugliness to avoid
502 * races and also avoid calling afs_close twice when closing the file.
503 * If we merely checked for opens > 0 in afs_linux_release, then if an
504 * new open occurred when storing back the file, afs_linux_release would
505 * incorrectly close the file and decrement the opens count. Calling afs_close
506 * on the just flushed file is wasteful, since the background daemon will
507 * execute the code that finally decides there is nothing to do.
509 int afs_linux_flush(struct file *fp)
511 struct vcache *vcp = (struct vcache *)FILE_INODE(fp);
515 /* Only do this on the last close of the file pointer. */
516 #if defined(AFS_LINUX24_ENV)
517 if (atomic_read(&fp->f_count) > 1)
526 code = afs_close(vcp, fp->f_flags, credp);
527 vcp->flushcnt++; /* protected by AFS global lock. */
534 /* Not allowed to directly read a directory. */
535 ssize_t afs_linux_dir_read(struct file *fp, char *buf, size_t count, loff_t *ppos)
542 #if defined(AFS_LINUX24_ENV)
543 struct file_operations afs_dir_fops = {
544 read: generic_read_dir,
545 readdir: afs_linux_readdir,
547 open: afs_linux_open,
548 release: afs_linux_release,
551 struct file_operations afs_dir_fops = {
552 NULL, /* afs_linux_lseek */
554 NULL, /* afs_linux_write */
556 NULL, /* afs_linux_select */
557 afs_xioctl, /* close enough to use the ported AFS one */
558 NULL, /* afs_linux_mmap */
560 NULL, /* afs_linux_flush */
563 NULL, /* afs_linux_fasync */
564 NULL, /* afs_linux_check_media_change */
565 NULL, /* afs_linux_file_revalidate */
570 #if defined(AFS_LINUX24_ENV)
571 struct file_operations afs_file_fops = {
572 read: afs_linux_read,
573 write: afs_linux_write,
575 mmap: afs_linux_mmap,
576 open: afs_linux_open,
577 flush: afs_linux_flush,
578 release: afs_linux_release,
579 fsync: afs_linux_fsync,
580 lock: afs_linux_lock,
583 struct file_operations afs_file_fops = {
584 NULL, /* afs_linux_lseek */
587 NULL, /* afs_linux_readdir */
588 NULL, /* afs_linux_select */
589 afs_xioctl, /* close enough to use the ported AFS one */
595 NULL, /* afs_linux_fasync */
596 NULL, /* afs_linux_check_media_change */
597 NULL, /* afs_linux_file_revalidate */
603 /**********************************************************************
604 * AFS Linux dentry operations
605 **********************************************************************/
607 /* afs_linux_revalidate
608 * Ensure vcache is stat'd before use. Return 0 if entry is valid.
610 static int afs_linux_revalidate(struct dentry *dp)
614 struct vrequest treq;
615 struct vcache *vcp = (struct vcache*)dp->d_inode;
618 #ifdef AFS_LINUX24_ENV
622 /* If it's a negative dentry, then there's nothing to do. */
624 #ifdef AFS_LINUX24_ENV
631 /* Drop the dentry if the callback is broken */
632 if (!(vcp->states & CStatd)) {
634 #ifdef AFS_LINUX24_ENV
641 /* Make this a fast path (no crref), since it's called so often. */
642 if (vcp->states & CStatd) {
643 if (*dp->d_name.name != '/' && vcp->mvstat == 2) /* root vnode */
644 check_bad_parent(dp); /* check and correct mvid */
646 #ifdef AFS_LINUX24_ENV
654 code = afs_InitReq(&treq, credp);
656 code = afs_VerifyVCache(vcp, &treq);
658 #ifdef AFS_LINUX24_ENV
667 /* Validate a dentry. Return 0 if unchanged, 1 if VFS layer should re-evaluate.
668 * In kernels 2.2.10 and above, we are passed an additional flags var which
669 * may have either the LOOKUP_FOLLOW OR LOOKUP_DIRECTORY set in which case
670 * we are advised to follow the entry if it is a link or to make sure that
671 * it is a directory. But since the kernel itself checks these possibilities
672 * later on, we shouldn't have to do it until later. Perhaps in the future..
674 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,10)
675 static int afs_linux_dentry_revalidate(struct dentry *dp, int flags)
677 static int afs_linux_dentry_revalidate(struct dentry *dp)
682 struct vrequest treq;
683 struct vcache *vcp = (struct vcache*)dp->d_inode;
686 #ifdef AFS_LINUX24_ENV
690 /* If it's a negative dentry, then there's nothing to do. */
692 #ifdef AFS_LINUX24_ENV
699 /* Make this a fast path (no crref), since it's called so often. */
700 if (vcp->states & CStatd) {
701 if (*dp->d_name.name != '/' && vcp->mvstat == 2) /* root vnode */
702 check_bad_parent(dp); /* check and correct mvid */
704 #ifdef AFS_LINUX24_ENV
712 code = afs_InitReq(&treq, credp);
714 code = afs_VerifyVCache(vcp, &treq);
716 #ifdef AFS_LINUX24_ENV
725 /* afs_dentry_iput */
726 static void afs_dentry_iput(struct dentry *dp, struct inode *ip)
731 #if defined(AFS_LINUX24_ENV)
732 struct dentry_operations afs_dentry_operations = {
733 d_revalidate: afs_linux_dentry_revalidate,
734 d_iput: afs_dentry_iput,
736 struct dentry_operations *afs_dops = &afs_dentry_operations;
738 struct dentry_operations afs_dentry_operations = {
739 afs_linux_dentry_revalidate, /* d_validate(struct dentry *) */
741 NULL, /* d_compare */
742 NULL, /* d_delete(struct dentry *) */
743 NULL, /* d_release(struct dentry *) */
744 afs_dentry_iput /* d_iput(struct dentry *, struct inode *) */
746 struct dentry_operations *afs_dops = &afs_dentry_operations;
749 /**********************************************************************
750 * AFS Linux inode operations
751 **********************************************************************/
755 * Merely need to set enough of vattr to get us through the create. Note
756 * that the higher level code (open_namei) will take care of any tuncation
757 * explicitly. Exclusive open is also taken care of in open_namei.
759 * name is in kernel space at this point.
761 int afs_linux_create(struct inode *dip, struct dentry *dp, int mode)
764 cred_t *credp = crref();
767 const char *name = dp->d_name.name;
771 vattr.va_mode = mode;
774 code = afs_create((struct vcache*)dip, name, &vattr, NONEXCL, mode,
775 (struct vcache**)&ip, credp);
778 vattr2inode(ip, &vattr);
779 /* Reset ops if symlink or directory. */
780 #if defined(AFS_LINUX24_ENV)
781 if (S_ISREG(ip->i_mode)) {
782 ip->i_op = &afs_file_iops;
783 ip->i_fop = &afs_file_fops;
784 ip->i_data.a_ops = &afs_file_aops;
785 } else if (S_ISDIR(ip->i_mode)) {
786 ip->i_op = &afs_dir_iops;
787 ip->i_fop = &afs_dir_fops;
788 } else if (S_ISLNK(ip->i_mode)) {
789 ip->i_op = &afs_symlink_iops;
790 ip->i_data.a_ops = &afs_symlink_aops;
791 ip->i_mapping = &ip->i_data;
793 printk("afs_linux_create: FIXME\n");
795 if (S_ISDIR(ip->i_mode))
796 ip->i_op = &afs_dir_iops;
797 else if (S_ISLNK(ip->i_mode))
798 ip->i_op = &afs_symlink_iops;
802 d_instantiate(dp, ip);
810 /* afs_linux_lookup */
811 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,10)
812 struct dentry *afs_linux_lookup(struct inode *dip, struct dentry *dp)
814 int afs_linux_lookup(struct inode *dip, struct dentry *dp)
818 cred_t *credp = crref();
819 struct vcache *vcp=NULL;
820 const char *comp = dp->d_name.name;
822 code = afs_lookup((struct vcache *)dip, comp, &vcp, credp);
825 struct inode *ip = (struct inode*)vcp;
826 /* Reset ops if symlink or directory. */
827 #if defined(AFS_LINUX24_ENV)
828 if (S_ISREG(ip->i_mode)) {
829 ip->i_op = &afs_file_iops;
830 ip->i_fop = &afs_file_fops;
831 ip->i_data.a_ops = &afs_file_aops;
832 } else if (S_ISDIR(ip->i_mode)) {
833 ip->i_op = &afs_dir_iops;
834 ip->i_fop = &afs_dir_fops;
835 } else if (S_ISLNK(ip->i_mode)) {
836 ip->i_op = &afs_symlink_iops;
837 ip->i_data.a_ops = &afs_symlink_aops;
838 ip->i_mapping = &ip->i_data;
840 printk("afs_linux_lookup: FIXME\n");
842 if (S_ISDIR(ip->i_mode))
843 ip->i_op = &afs_dir_iops;
844 else if (S_ISLNK(ip->i_mode))
845 ip->i_op = &afs_symlink_iops;
849 d_add(dp, (struct inode*)vcp);
854 /* It's ok for the file to not be found. That's noted by the caller by
855 * seeing that the dp->d_inode field is NULL.
857 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,10)
861 return ERR_PTR(-code);
869 int afs_linux_link(struct dentry *olddp, struct inode *dip,
870 struct dentry *newdp)
873 cred_t *credp = crref();
874 const char *name = newdp->d_name.name;
875 struct inode *oldip = olddp->d_inode;
877 /* If afs_link returned the vnode, we could instantiate the
878 * dentry. Since it's not, we drop this one and do a new lookup.
883 code = afs_link((struct vcache*)oldip, (struct vcache*)dip, name, credp);
890 int afs_linux_unlink(struct inode *dip, struct dentry *dp)
893 cred_t *credp = crref();
894 const char *name = dp->d_name.name;
897 if (!list_empty(&dp->d_hash)) {
899 /* Install a definite non-existence if we're the only user. */
900 #if defined(AFS_LINUX24_ENV)
901 if (atomic_read(&dp->d_count) == 1)
903 if (dp->d_count == 1)
909 code = afs_remove((struct vcache*)dip, name, credp);
914 d_add(dp, NULL); /* means definitely does _not_ exist */
921 int afs_linux_symlink(struct inode *dip, struct dentry *dp,
925 cred_t *credp = crref();
927 const char *name = dp->d_name.name;
929 /* If afs_symlink returned the vnode, we could instantiate the
930 * dentry. Since it's not, we drop this one and do a new lookup.
936 code = afs_symlink((struct vcache*)dip, name, &vattr, target, credp);
942 int afs_linux_mkdir(struct inode *dip, struct dentry *dp, int mode)
945 cred_t *credp = crref();
946 struct vcache *tvcp = NULL;
948 const char *name = dp->d_name.name;
952 vattr.va_mask = ATTR_MODE;
953 vattr.va_mode = mode;
954 code = afs_mkdir((struct vcache*)dip, name, &vattr, &tvcp, credp);
957 tvcp->v.v_op = &afs_dir_iops;
958 #if defined(AFS_LINUX24_ENV)
959 tvcp->v.v_fop = &afs_dir_fops;
962 d_instantiate(dp, (struct inode*)tvcp);
969 int afs_linux_rmdir(struct inode *dip, struct dentry *dp)
972 cred_t *credp = crref();
973 const char *name = dp->d_name.name;
976 code = afs_rmdir((struct vcache*)dip, name, credp);
978 /* Linux likes to see ENOTDIR returned from an rmdir() syscall
979 * that failed because a directory is not empty. So, we map
980 * EEXIST to ENOTDIR on linux.
982 if (code == EEXIST) {
997 int afs_linux_rename(struct inode *oldip, struct dentry *olddp,
998 struct inode *newip, struct dentry *newdp)
1001 cred_t *credp = crref();
1002 const char *oldname = olddp->d_name.name;
1003 const char *newname = newdp->d_name.name;
1005 /* Remove old and new entries from name hash. New one will change below.
1006 * While it's optimal to catch failures and re-insert newdp into hash,
1007 * it's also error prone and in that case we're already dealing with error
1008 * cases. Let another lookup put things right, if need be.
1010 if (!list_empty(&olddp->d_hash)) {
1013 if (!list_empty(&newdp->d_hash)) {
1017 code = afs_rename((struct vcache*)oldip, oldname, (struct vcache*)newip,
1022 d_move(olddp, newdp);
1029 /* afs_linux_ireadlink
1030 * Internal readlink which can return link contents to user or kernel space.
1031 * Note that the buffer is NOT supposed to be null-terminated.
1033 static int afs_linux_ireadlink(struct inode *ip, char *target, int maxlen,
1037 cred_t *credp = crref();
1041 setup_uio(&tuio, &iov, target, 0, maxlen, UIO_READ, seg);
1042 code = afs_readlink((struct vcache*)ip, &tuio, credp);
1046 return maxlen - tuio.uio_resid;
1051 #if !defined(AFS_LINUX24_ENV)
1052 /* afs_linux_readlink
1053 * Fill target (which is in user space) with contents of symlink.
1055 int afs_linux_readlink(struct dentry *dp, char *target, int maxlen)
1058 struct inode *ip = dp->d_inode;
1061 code = afs_linux_ireadlink(ip, target, maxlen, AFS_UIOUSER);
1067 /* afs_linux_follow_link
1068 * a file system dependent link following routine.
1070 struct dentry * afs_linux_follow_link(struct dentry *dp,
1071 struct dentry *basep,
1072 unsigned int follow)
1079 name = osi_Alloc(PATH_MAX+1);
1083 return ERR_PTR(-EIO);
1086 code = afs_linux_ireadlink(dp->d_inode, name, PATH_MAX, AFS_UIOSYS);
1091 res = ERR_PTR(code);
1095 res = lookup_dentry(name, basep, follow);
1099 osi_Free(name, PATH_MAX+1);
1105 /* afs_linux_readpage
1106 * all reads come through here. A strategy-like read call.
1108 int afs_linux_readpage(struct file *fp, struct page *pp)
1111 cred_t *credp = crref();
1112 ulong address = afs_linux_page_address(pp);
1115 struct inode *ip = FILE_INODE(fp);
1116 int cnt = atomic_read(&pp->count);
1119 afs_Trace4(afs_iclSetp, CM_TRACE_READPAGE,
1120 ICL_TYPE_POINTER, ip,
1121 ICL_TYPE_POINTER, pp,
1122 ICL_TYPE_INT32, cnt,
1123 ICL_TYPE_INT32, 99999); /* not a possible code value */
1124 atomic_add(1, &pp->count);
1125 #if defined(AFS_LINUX24_ENV)
1128 set_bit(PG_locked, &pp->flags); /* other bits? See mm.h */
1129 clear_bit(PG_error, &pp->flags);
1132 #if defined(AFS_LINUX24_ENV)
1133 setup_uio(&tuio, &iovec, (char*)address, pp->index << PAGE_CACHE_SHIFT,
1134 PAGESIZE, UIO_READ, AFS_UIOSYS);
1136 setup_uio(&tuio, &iovec, (char*)address, pageoff(pp), PAGESIZE,
1137 UIO_READ, AFS_UIOSYS);
1139 #if defined(AFS_LINUX24_ENV)
1142 code = afs_rdwr((struct vcache*)ip, &tuio, UIO_READ, 0, credp);
1143 #if defined(AFS_LINUX24_ENV)
1148 if (tuio.uio_resid) /* zero remainder of page */
1149 memset((void*)(address+(PAGESIZE-tuio.uio_resid)), 0,
1151 #if defined(AFS_LINUX24_ENV)
1153 flush_dcache_page(pp);
1155 SetPageUptodate(pp);
1157 set_bit(PG_uptodate, &pp->flags);
1161 #if defined(AFS_LINUX24_ENV)
1164 clear_bit(PG_locked, &pp->flags);
1170 afs_Trace4(afs_iclSetp, CM_TRACE_READPAGE,
1171 ICL_TYPE_POINTER, ip,
1172 ICL_TYPE_POINTER, pp,
1173 ICL_TYPE_INT32, cnt,
1174 ICL_TYPE_INT32, code);
1179 #if defined(AFS_LINUX24_ENV)
1180 int afs_linux_writepage(struct page *pp)
1182 struct address_space *mapping = pp->mapping;
1183 struct inode *inode;
1184 unsigned long end_index;
1185 unsigned offset = PAGE_CACHE_SIZE;
1188 inode = (struct inode *) mapping->host;
1189 end_index = inode->i_size >> PAGE_CACHE_SHIFT;
1192 if (pp->index < end_index)
1194 /* things got complicated... */
1195 offset = inode->i_size & (PAGE_CACHE_SIZE-1);
1196 /* OK, are we completely out? */
1197 if (pp->index >= end_index+1 || !offset)
1201 status = afs_linux_writepage_sync(inode, pp, 0, offset);
1203 SetPageUptodate(pp);
1206 if (status == offset)
1214 /* afs_linux_bmap - supports generic_readpage, but we roll our own. */
1215 int afs_linux_bmap(struct inode *ip, int) { return -EINVAL; }
1217 /* afs_linux_truncate
1218 * Handles discarding disk blocks if this were a device. ext2 indicates we
1219 * may need to zero partial last pages of memory mapped files.
1221 void afs_linux_truncate(struct inode *ip)
1226 /* afs_linux_permission
1227 * Check access rights - returns error if can't check or permission denied.
1229 int afs_linux_permission(struct inode *ip, int mode)
1232 cred_t *credp = crref();
1236 if (mode & MAY_EXEC) tmp |= VEXEC;
1237 if (mode & MAY_READ) tmp |= VREAD;
1238 if (mode & MAY_WRITE) tmp |= VWRITE;
1239 code = afs_access((struct vcache*)ip, tmp, credp);
1248 /* msdos sector mapping hack for memory mapping. */
1249 int afs_linux_smap(struct inode *ip, int) { return -EINVAL; }
1252 #if defined(AFS_LINUX24_ENV)
1253 int afs_linux_writepage_sync(struct inode *ip, struct page *pp,
1254 unsigned long offset,
1257 struct vcache *vcp = (struct vcache *) ip;
1258 u8 *page_addr = (u8*) afs_linux_page_address(pp);
1266 afs_Trace4(afs_iclSetp, CM_TRACE_UPDATEPAGE, ICL_TYPE_POINTER, vcp,
1267 ICL_TYPE_POINTER, pp,
1268 ICL_TYPE_INT32, atomic_read(&pp->count),
1269 ICL_TYPE_INT32, 99999);
1270 setup_uio(&tuio, &iovec, page_addr + offset,
1271 (pp->index << PAGE_CACHE_SHIFT) + offset, count,
1272 UIO_WRITE, AFS_UIOSYS);
1274 code = afs_write(vcp, &tuio, f_flags, credp, 0);
1278 code = code ? -code : count - tuio.uio_resid;
1279 afs_Trace4(afs_iclSetp, CM_TRACE_UPDATEPAGE, ICL_TYPE_POINTER, vcp,
1280 ICL_TYPE_POINTER, pp,
1281 ICL_TYPE_INT32, atomic_read(&pp->count),
1282 ICL_TYPE_INT32, code);
1290 afs_linux_updatepage(struct file *file, struct page *page,
1291 unsigned long offset, unsigned int count)
1293 struct dentry *dentry = file->f_dentry;
1295 return afs_linux_writepage_sync(dentry->d_inode, page, offset, count);
1298 /* afs_linux_updatepage
1299 * What one would have thought was writepage - write dirty page to file.
1300 * Called from generic_file_write. buffer is still in user space. pagep
1301 * has been filled in with old data if we're updating less than a page.
1303 int afs_linux_updatepage(struct file *fp, struct page *pp,
1304 unsigned long offset,
1305 unsigned int count, int sync)
1307 struct vcache *vcp = (struct vcache *)FILE_INODE(fp);
1308 u8 *page_addr = (u8*) afs_linux_page_address(pp);
1314 set_bit(PG_locked, &pp->flags);
1318 afs_Trace4(afs_iclSetp, CM_TRACE_UPDATEPAGE, ICL_TYPE_POINTER, vcp,
1319 ICL_TYPE_POINTER, pp,
1320 ICL_TYPE_INT32, atomic_read(&pp->count),
1321 ICL_TYPE_INT32, 99999);
1322 setup_uio(&tuio, &iovec, page_addr + offset, pageoff(pp) + offset, count,
1323 UIO_WRITE, AFS_UIOSYS);
1325 code = afs_write(vcp, &tuio, fp->f_flags, credp, 0);
1329 code = code ? -code : count - tuio.uio_resid;
1330 afs_Trace4(afs_iclSetp, CM_TRACE_UPDATEPAGE, ICL_TYPE_POINTER, vcp,
1331 ICL_TYPE_POINTER, pp,
1332 ICL_TYPE_INT32, atomic_read(&pp->count),
1333 ICL_TYPE_INT32, code);
1338 clear_bit(PG_locked, &pp->flags);
1343 #if defined(AFS_LINUX24_ENV)
1344 static int afs_linux_commit_write(struct file *file, struct page *page, unsigned offset, unsigned to)
1350 status = afs_linux_updatepage(file, page, offset, to-offset);
1358 static int afs_linux_prepare_write(struct file *file, struct page *page,
1359 unsigned from, unsigned to)
1365 extern int afs_notify_change(struct dentry *dp, struct iattr* iattrp);
1368 #if defined(AFS_LINUX24_ENV)
1369 struct inode_operations afs_file_iops = {
1370 revalidate: afs_linux_revalidate,
1371 setattr: afs_notify_change,
1372 permission: afs_linux_permission,
1374 struct address_space_operations afs_file_aops = {
1375 readpage: afs_linux_readpage,
1376 writepage: afs_linux_writepage,
1377 commit_write: afs_linux_commit_write,
1378 prepare_write: afs_linux_prepare_write,
1381 struct inode_operations *afs_ops = &afs_file_iops;
1383 struct inode_operations afs_iops = {
1384 &afs_file_fops, /* file operations */
1385 NULL, /* afs_linux_create */
1386 NULL, /* afs_linux_lookup */
1387 NULL, /* afs_linux_link */
1388 NULL, /* afs_linux_unlink */
1389 NULL, /* afs_linux_symlink */
1390 NULL, /* afs_linux_mkdir */
1391 NULL, /* afs_linux_rmdir */
1392 NULL, /* afs_linux_mknod */
1393 NULL, /* afs_linux_rename */
1394 NULL, /* afs_linux_readlink */
1395 NULL, /* afs_linux_follow_link */
1397 NULL, /* afs_linux_writepage */
1398 NULL, /* afs_linux_bmap */
1399 NULL, /* afs_linux_truncate */
1400 afs_linux_permission,
1401 NULL, /* afs_linux_smap */
1402 afs_linux_updatepage,
1403 afs_linux_revalidate,
1406 struct inode_operations *afs_ops = &afs_iops;
1409 /* Separate ops vector for directories. Linux 2.2 tests type of inode
1410 * by what sort of operation is allowed.....
1412 #if defined(AFS_LINUX24_ENV)
1413 struct inode_operations afs_dir_iops = {
1414 create: afs_linux_create,
1415 lookup: afs_linux_lookup,
1416 link: afs_linux_link,
1417 unlink: afs_linux_unlink,
1418 symlink: afs_linux_symlink,
1419 mkdir: afs_linux_mkdir,
1420 rmdir: afs_linux_rmdir,
1421 rename: afs_linux_rename,
1422 revalidate: afs_linux_revalidate,
1423 setattr: afs_notify_change,
1424 permission: afs_linux_permission,
1427 struct inode_operations afs_dir_iops = {
1428 &afs_dir_fops, /* file operations for directories */
1436 NULL, /* afs_linux_mknod */
1438 NULL, /* afs_linux_readlink */
1439 NULL, /* afs_linux_follow_link */
1440 NULL, /* afs_linux_readpage */
1441 NULL, /* afs_linux_writepage */
1442 NULL, /* afs_linux_bmap */
1443 NULL, /* afs_linux_truncate */
1444 afs_linux_permission,
1445 NULL, /* afs_linux_smap */
1446 NULL, /* afs_linux_updatepage */
1447 afs_linux_revalidate,
1451 /* We really need a separate symlink set of ops, since do_follow_link()
1452 * determines if it _is_ a link by checking if the follow_link op is set.
1454 #if defined(AFS_LINUX24_ENV)
1455 static int afs_symlink_filler(struct file *file, struct page *page)
1457 struct inode *ip = (struct inode *) page->mapping->host;
1458 char *p = (char *)kmap(page);
1463 code = afs_linux_ireadlink(ip, p, PAGE_SIZE, AFS_UIOSYS);
1469 p[code] = '\0'; /* null terminate? */
1470 SetPageUptodate(page);
1482 struct address_space_operations afs_symlink_aops = {
1483 readpage: afs_symlink_filler
1486 struct inode_operations afs_symlink_iops = {
1487 readlink: page_readlink,
1488 follow_link: page_follow_link,
1489 setattr: afs_notify_change,
1492 struct inode_operations afs_symlink_iops = {
1493 NULL, /* file operations */
1501 NULL, /* afs_linux_mknod */
1504 afs_linux_follow_link,
1505 NULL, /* readpage */
1506 NULL, /* afs_linux_writepage */
1507 NULL, /* afs_linux_bmap */
1508 NULL, /* afs_linux_truncate */
1509 afs_linux_permission, /* tho the code appears to indicate not used? */
1510 NULL, /* afs_linux_smap */
1511 NULL, /* updatepage */
1512 afs_linux_revalidate, /* tho the code appears to indicate not used? */