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 /* Make this a fast path (no crref), since it's called so often. */
632 if (vcp->states & CStatd) {
633 if (*dp->d_name.name != '/' && vcp->mvstat == 2) /* root vnode */
634 check_bad_parent(dp); /* check and correct mvid */
636 #ifdef AFS_LINUX24_ENV
644 code = afs_InitReq(&treq, credp);
646 code = afs_VerifyVCache(vcp, &treq);
648 #ifdef AFS_LINUX24_ENV
657 /* Validate a dentry. Return 0 if unchanged, 1 if VFS layer should re-evaluate.
658 * In kernels 2.2.10 and above, we are passed an additional flags var which
659 * may have either the LOOKUP_FOLLOW OR LOOKUP_DIRECTORY set in which case
660 * we are advised to follow the entry if it is a link or to make sure that
661 * it is a directory. But since the kernel itself checks these possibilities
662 * later on, we shouldn't have to do it until later. Perhaps in the future..
664 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,10)
665 static int afs_linux_dentry_revalidate(struct dentry *dp, int flags)
667 static int afs_linux_dentry_revalidate(struct dentry *dp)
672 struct vrequest treq;
673 struct vcache *vcp = (struct vcache*)dp->d_inode;
676 #ifdef AFS_LINUX24_ENV
680 /* If it's a negative dentry, then there's nothing to do. */
682 #ifdef AFS_LINUX24_ENV
689 /* Make this a fast path (no crref), since it's called so often. */
690 if (vcp->states & CStatd) {
691 if (*dp->d_name.name != '/' && vcp->mvstat == 2) /* root vnode */
692 check_bad_parent(dp); /* check and correct mvid */
694 #ifdef AFS_LINUX24_ENV
702 code = afs_InitReq(&treq, credp);
704 code = afs_VerifyVCache(vcp, &treq);
706 #ifdef AFS_LINUX24_ENV
715 /* afs_dentry_iput */
716 static void afs_dentry_iput(struct dentry *dp, struct inode *ip)
718 #if defined(AFS_LINUX24_ENV)
719 if (atomic_read(&ip->i_count) == 0 || atomic_read(&ip->i_count) & 0xffff0000) {
721 if (ip->i_count == 0 || ip->i_count & 0xffff0000) {
723 osi_Panic("Bad refCount %d on inode 0x%x\n",
724 #if defined(AFS_LINUX24_ENV)
725 atomic_read(&ip->i_count), ip);
730 #if defined(AFS_LINUX24_ENV)
731 atomic_dec(&ip->i_count);
732 if (!atomic_read(&ip->i_count)) {
737 afs_delete_inode(ip);
741 #if defined(AFS_LINUX24_ENV)
742 struct dentry_operations afs_dentry_operations = {
743 d_revalidate: afs_linux_dentry_revalidate,
744 d_iput: afs_dentry_iput,
746 struct dentry_operations *afs_dops = &afs_dentry_operations;
748 struct dentry_operations afs_dentry_operations = {
749 afs_linux_dentry_revalidate, /* d_validate(struct dentry *) */
751 NULL, /* d_compare */
752 NULL, /* d_delete(struct dentry *) */
753 NULL, /* d_release(struct dentry *) */
754 afs_dentry_iput /* d_iput(struct dentry *, struct inode *) */
756 struct dentry_operations *afs_dops = &afs_dentry_operations;
759 /**********************************************************************
760 * AFS Linux inode operations
761 **********************************************************************/
765 * Merely need to set enough of vattr to get us through the create. Note
766 * that the higher level code (open_namei) will take care of any tuncation
767 * explicitly. Exclusive open is also taken care of in open_namei.
769 * name is in kernel space at this point.
771 int afs_linux_create(struct inode *dip, struct dentry *dp, int mode)
774 cred_t *credp = crref();
777 const char *name = dp->d_name.name;
781 vattr.va_mode = mode;
784 code = afs_create((struct vcache*)dip, name, &vattr, NONEXCL, mode,
785 (struct vcache**)&ip, credp);
788 vattr2inode(ip, &vattr);
789 /* Reset ops if symlink or directory. */
790 #if defined(AFS_LINUX24_ENV)
791 if (S_ISREG(ip->i_mode)) {
792 ip->i_op = &afs_file_iops;
793 ip->i_fop = &afs_file_fops;
794 ip->i_data.a_ops = &afs_file_aops;
795 } else if (S_ISDIR(ip->i_mode)) {
796 ip->i_op = &afs_dir_iops;
797 ip->i_fop = &afs_dir_fops;
798 } else if (S_ISLNK(ip->i_mode)) {
799 ip->i_op = &afs_symlink_iops;
800 ip->i_data.a_ops = &afs_symlink_aops;
801 ip->i_mapping = &ip->i_data;
803 printk("afs_linux_create: FIXME\n");
805 if (S_ISDIR(ip->i_mode))
806 ip->i_op = &afs_dir_iops;
807 else if (S_ISLNK(ip->i_mode))
808 ip->i_op = &afs_symlink_iops;
812 d_instantiate(dp, ip);
820 /* afs_linux_lookup */
821 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,10)
822 struct dentry *afs_linux_lookup(struct inode *dip, struct dentry *dp)
824 int afs_linux_lookup(struct inode *dip, struct dentry *dp)
828 cred_t *credp = crref();
829 struct vcache *vcp=NULL;
830 const char *comp = dp->d_name.name;
832 code = afs_lookup((struct vcache *)dip, comp, &vcp, credp);
835 struct inode *ip = (struct inode*)vcp;
836 /* Reset ops if symlink or directory. */
837 #if defined(AFS_LINUX24_ENV)
838 if (S_ISREG(ip->i_mode)) {
839 ip->i_op = &afs_file_iops;
840 ip->i_fop = &afs_file_fops;
841 ip->i_data.a_ops = &afs_file_aops;
842 } else if (S_ISDIR(ip->i_mode)) {
843 ip->i_op = &afs_dir_iops;
844 ip->i_fop = &afs_dir_fops;
845 } else if (S_ISLNK(ip->i_mode)) {
846 ip->i_op = &afs_symlink_iops;
847 ip->i_data.a_ops = &afs_symlink_aops;
848 ip->i_mapping = &ip->i_data;
850 printk("afs_linux_lookup: FIXME\n");
852 if (S_ISDIR(ip->i_mode))
853 ip->i_op = &afs_dir_iops;
854 else if (S_ISLNK(ip->i_mode))
855 ip->i_op = &afs_symlink_iops;
859 d_add(dp, (struct inode*)vcp);
864 /* It's ok for the file to not be found. That's noted by the caller by
865 * seeing that the dp->d_inode field is NULL.
867 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,10)
871 return ERR_PTR(-code);
879 int afs_linux_link(struct dentry *olddp, struct inode *dip,
880 struct dentry *newdp)
883 cred_t *credp = crref();
884 const char *name = newdp->d_name.name;
885 struct inode *oldip = olddp->d_inode;
887 /* If afs_link returned the vnode, we could instantiate the
888 * dentry. Since it's not, we drop this one and do a new lookup.
893 code = afs_link((struct vcache*)oldip, (struct vcache*)dip, name, credp);
900 int afs_linux_unlink(struct inode *dip, struct dentry *dp)
903 cred_t *credp = crref();
904 const char *name = dp->d_name.name;
907 if (!list_empty(&dp->d_hash)) {
909 /* Install a definite non-existence if we're the only user. */
910 #if defined(AFS_LINUX24_ENV)
911 if (atomic_read(&dp->d_count) == 1)
913 if (dp->d_count == 1)
919 code = afs_remove((struct vcache*)dip, name, credp);
924 d_add(dp, NULL); /* means definitely does _not_ exist */
931 int afs_linux_symlink(struct inode *dip, struct dentry *dp,
935 cred_t *credp = crref();
937 const char *name = dp->d_name.name;
939 /* If afs_symlink returned the vnode, we could instantiate the
940 * dentry. Since it's not, we drop this one and do a new lookup.
946 code = afs_symlink((struct vcache*)dip, name, &vattr, target, credp);
952 int afs_linux_mkdir(struct inode *dip, struct dentry *dp, int mode)
955 cred_t *credp = crref();
956 struct vcache *tvcp = NULL;
958 const char *name = dp->d_name.name;
962 vattr.va_mask = ATTR_MODE;
963 vattr.va_mode = mode;
964 code = afs_mkdir((struct vcache*)dip, name, &vattr, &tvcp, credp);
967 tvcp->v.v_op = &afs_dir_iops;
968 #if defined(AFS_LINUX24_ENV)
969 tvcp->v.v_fop = &afs_dir_fops;
972 d_instantiate(dp, (struct inode*)tvcp);
979 int afs_linux_rmdir(struct inode *dip, struct dentry *dp)
982 cred_t *credp = crref();
983 const char *name = dp->d_name.name;
986 code = afs_rmdir((struct vcache*)dip, name, credp);
988 /* Linux likes to see ENOTDIR returned from an rmdir() syscall
989 * that failed because a directory is not empty. So, we map
990 * EEXIST to ENOTDIR on linux.
992 if (code == EEXIST) {
1007 int afs_linux_rename(struct inode *oldip, struct dentry *olddp,
1008 struct inode *newip, struct dentry *newdp)
1011 cred_t *credp = crref();
1012 const char *oldname = olddp->d_name.name;
1013 const char *newname = newdp->d_name.name;
1015 /* Remove old and new entries from name hash. New one will change below.
1016 * While it's optimal to catch failures and re-insert newdp into hash,
1017 * it's also error prone and in that case we're already dealing with error
1018 * cases. Let another lookup put things right, if need be.
1020 if (!list_empty(&olddp->d_hash)) {
1023 if (!list_empty(&newdp->d_hash)) {
1027 code = afs_rename((struct vcache*)oldip, oldname, (struct vcache*)newip,
1032 d_move(olddp, newdp);
1039 /* afs_linux_ireadlink
1040 * Internal readlink which can return link contents to user or kernel space.
1041 * Note that the buffer is NOT supposed to be null-terminated.
1043 static int afs_linux_ireadlink(struct inode *ip, char *target, int maxlen,
1047 cred_t *credp = crref();
1051 setup_uio(&tuio, &iov, target, 0, maxlen, UIO_READ, seg);
1052 code = afs_readlink((struct vcache*)ip, &tuio, credp);
1056 return maxlen - tuio.uio_resid;
1061 #if !defined(AFS_LINUX24_ENV)
1062 /* afs_linux_readlink
1063 * Fill target (which is in user space) with contents of symlink.
1065 int afs_linux_readlink(struct dentry *dp, char *target, int maxlen)
1068 struct inode *ip = dp->d_inode;
1071 code = afs_linux_ireadlink(ip, target, maxlen, AFS_UIOUSER);
1077 /* afs_linux_follow_link
1078 * a file system dependent link following routine.
1080 struct dentry * afs_linux_follow_link(struct dentry *dp,
1081 struct dentry *basep,
1082 unsigned int follow)
1089 name = osi_Alloc(PATH_MAX+1);
1093 return ERR_PTR(-EIO);
1096 code = afs_linux_ireadlink(dp->d_inode, name, PATH_MAX, AFS_UIOSYS);
1101 res = ERR_PTR(code);
1105 res = lookup_dentry(name, basep, follow);
1109 osi_Free(name, PATH_MAX+1);
1115 /* afs_linux_readpage
1116 * all reads come through here. A strategy-like read call.
1118 int afs_linux_readpage(struct file *fp, struct page *pp)
1121 cred_t *credp = crref();
1122 ulong address = afs_linux_page_address(pp);
1125 struct inode *ip = FILE_INODE(fp);
1126 int cnt = atomic_read(&pp->count);
1129 afs_Trace4(afs_iclSetp, CM_TRACE_READPAGE,
1130 ICL_TYPE_POINTER, ip,
1131 ICL_TYPE_POINTER, pp,
1132 ICL_TYPE_INT32, cnt,
1133 ICL_TYPE_INT32, 99999); /* not a possible code value */
1134 atomic_add(1, &pp->count);
1135 #if defined(AFS_LINUX24_ENV)
1138 set_bit(PG_locked, &pp->flags); /* other bits? See mm.h */
1139 clear_bit(PG_error, &pp->flags);
1142 #if defined(AFS_LINUX24_ENV)
1143 setup_uio(&tuio, &iovec, (char*)address, pp->index << PAGE_CACHE_SHIFT,
1144 PAGESIZE, UIO_READ, AFS_UIOSYS);
1146 setup_uio(&tuio, &iovec, (char*)address, pageoff(pp), PAGESIZE,
1147 UIO_READ, AFS_UIOSYS);
1149 #ifdef AFS_LINUX24_ENV
1152 code = afs_rdwr((struct vcache*)ip, &tuio, UIO_READ, 0, credp);
1153 #ifdef AFS_LINUX24_ENV
1158 if (tuio.uio_resid) /* zero remainder of page */
1159 memset((void*)(address+(PAGESIZE-tuio.uio_resid)), 0,
1161 #if defined(AFS_LINUX24_ENV)
1162 SetPageUptodate(pp);
1164 set_bit(PG_uptodate, &pp->flags);
1168 #if defined(AFS_LINUX24_ENV)
1171 clear_bit(PG_locked, &pp->flags);
1177 afs_Trace4(afs_iclSetp, CM_TRACE_READPAGE,
1178 ICL_TYPE_POINTER, ip,
1179 ICL_TYPE_POINTER, pp,
1180 ICL_TYPE_INT32, cnt,
1181 ICL_TYPE_INT32, code);
1186 #if defined(AFS_LINUX24_ENV)
1187 int afs_linux_writepage(struct page *pp)
1189 struct address_space *mapping = pp->mapping;
1190 struct inode *inode;
1191 unsigned long end_index;
1192 unsigned offset = PAGE_CACHE_SIZE;
1195 inode = (struct inode *) mapping->host;
1196 end_index = inode->i_size >> PAGE_CACHE_SHIFT;
1199 if (pp->index < end_index)
1201 /* things got complicated... */
1202 offset = inode->i_size & (PAGE_CACHE_SIZE-1);
1203 /* OK, are we completely out? */
1204 if (pp->index >= end_index+1 || !offset)
1207 status = afs_linux_writepage_sync(inode, pp, 0, offset);
1208 SetPageUptodate(pp);
1211 if (status == offset)
1219 /* afs_linux_bmap - supports generic_readpage, but we roll our own. */
1220 int afs_linux_bmap(struct inode *ip, int) { return -EINVAL; }
1222 /* afs_linux_truncate
1223 * Handles discarding disk blocks if this were a device. ext2 indicates we
1224 * may need to zero partial last pages of memory mapped files.
1226 void afs_linux_truncate(struct inode *ip)
1231 /* afs_linux_permission
1232 * Check access rights - returns error if can't check or permission denied.
1234 int afs_linux_permission(struct inode *ip, int mode)
1237 cred_t *credp = crref();
1241 if (mode & MAY_EXEC) tmp |= VEXEC;
1242 if (mode & MAY_READ) tmp |= VREAD;
1243 if (mode & MAY_WRITE) tmp |= VWRITE;
1244 code = afs_access((struct vcache*)ip, tmp, credp);
1253 /* msdos sector mapping hack for memory mapping. */
1254 int afs_linux_smap(struct inode *ip, int) { return -EINVAL; }
1257 #if defined(AFS_LINUX24_ENV)
1258 int afs_linux_writepage_sync(struct inode *ip, struct page *pp,
1259 unsigned long offset,
1262 struct vcache *vcp = (struct vcache *) ip;
1263 u8 *page_addr = (u8*) afs_linux_page_address(pp);
1273 afs_Trace4(afs_iclSetp, CM_TRACE_UPDATEPAGE, ICL_TYPE_POINTER, vcp,
1274 ICL_TYPE_POINTER, pp,
1275 ICL_TYPE_INT32, atomic_read(&pp->count),
1276 ICL_TYPE_INT32, 99999);
1277 setup_uio(&tuio, &iovec, page_addr + offset,
1278 (pp->index << PAGE_CACHE_SHIFT) + offset, count,
1279 UIO_WRITE, AFS_UIOSYS);
1281 code = afs_write(vcp, &tuio, f_flags, credp, 0);
1285 code = code ? -code : count - tuio.uio_resid;
1286 afs_Trace4(afs_iclSetp, CM_TRACE_UPDATEPAGE, ICL_TYPE_POINTER, vcp,
1287 ICL_TYPE_POINTER, pp,
1288 ICL_TYPE_INT32, atomic_read(&pp->count),
1289 ICL_TYPE_INT32, code);
1299 afs_linux_updatepage(struct file *file, struct page *page,
1300 unsigned long offset, unsigned int count)
1302 struct dentry *dentry = file->f_dentry;
1304 return afs_linux_writepage_sync(dentry->d_inode, page, offset, count);
1307 /* afs_linux_updatepage
1308 * What one would have thought was writepage - write dirty page to file.
1309 * Called from generic_file_write. buffer is still in user space. pagep
1310 * has been filled in with old data if we're updating less than a page.
1312 int afs_linux_updatepage(struct file *fp, struct page *pp,
1313 unsigned long offset,
1314 unsigned int count, int sync)
1316 struct vcache *vcp = (struct vcache *)FILE_INODE(fp);
1317 u8 *page_addr = (u8*) afs_linux_page_address(pp);
1323 set_bit(PG_locked, &pp->flags);
1327 afs_Trace4(afs_iclSetp, CM_TRACE_UPDATEPAGE, ICL_TYPE_POINTER, vcp,
1328 ICL_TYPE_POINTER, pp,
1329 ICL_TYPE_INT32, atomic_read(&pp->count),
1330 ICL_TYPE_INT32, 99999);
1331 setup_uio(&tuio, &iovec, page_addr + offset, pageoff(pp) + offset, count,
1332 UIO_WRITE, AFS_UIOSYS);
1334 code = afs_write(vcp, &tuio, fp->f_flags, credp, 0);
1338 code = code ? -code : count - tuio.uio_resid;
1339 afs_Trace4(afs_iclSetp, CM_TRACE_UPDATEPAGE, ICL_TYPE_POINTER, vcp,
1340 ICL_TYPE_POINTER, pp,
1341 ICL_TYPE_INT32, atomic_read(&pp->count),
1342 ICL_TYPE_INT32, code);
1347 clear_bit(PG_locked, &pp->flags);
1352 #if defined(AFS_LINUX24_ENV)
1353 static int afs_linux_commit_write(struct file *file, struct page *page, unsigned offset, unsigned to)
1357 /* lock_kernel(); */
1358 status = afs_linux_updatepage(file, page, offset, to-offset);
1359 /* unlock_kernel(); */
1365 static int afs_linux_prepare_write(struct file *file, struct page *page,
1366 unsigned from, unsigned to)
1372 extern int afs_notify_change(struct dentry *dp, struct iattr* iattrp);
1375 #if defined(AFS_LINUX24_ENV)
1376 struct inode_operations afs_file_iops = {
1377 revalidate: afs_linux_revalidate,
1378 setattr: afs_notify_change,
1379 permission: afs_linux_permission,
1381 struct address_space_operations afs_file_aops = {
1382 readpage: afs_linux_readpage,
1383 writepage: afs_linux_writepage,
1384 commit_write: afs_linux_commit_write,
1385 prepare_write: afs_linux_prepare_write,
1388 struct inode_operations *afs_ops = &afs_file_iops;
1390 struct inode_operations afs_iops = {
1391 &afs_file_fops, /* file operations */
1392 NULL, /* afs_linux_create */
1393 NULL, /* afs_linux_lookup */
1394 NULL, /* afs_linux_link */
1395 NULL, /* afs_linux_unlink */
1396 NULL, /* afs_linux_symlink */
1397 NULL, /* afs_linux_mkdir */
1398 NULL, /* afs_linux_rmdir */
1399 NULL, /* afs_linux_mknod */
1400 NULL, /* afs_linux_rename */
1401 NULL, /* afs_linux_readlink */
1402 NULL, /* afs_linux_follow_link */
1404 NULL, /* afs_linux_writepage */
1405 NULL, /* afs_linux_bmap */
1406 NULL, /* afs_linux_truncate */
1407 afs_linux_permission,
1408 NULL, /* afs_linux_smap */
1409 afs_linux_updatepage,
1410 afs_linux_revalidate,
1413 struct inode_operations *afs_ops = &afs_iops;
1416 /* Separate ops vector for directories. Linux 2.2 tests type of inode
1417 * by what sort of operation is allowed.....
1419 #if defined(AFS_LINUX24_ENV)
1420 struct inode_operations afs_dir_iops = {
1421 create: afs_linux_create,
1422 lookup: afs_linux_lookup,
1423 link: afs_linux_link,
1424 unlink: afs_linux_unlink,
1425 symlink: afs_linux_symlink,
1426 mkdir: afs_linux_mkdir,
1427 rmdir: afs_linux_rmdir,
1428 rename: afs_linux_rename,
1429 revalidate: afs_linux_revalidate,
1430 setattr: afs_notify_change,
1431 permission: afs_linux_permission,
1434 struct inode_operations afs_dir_iops = {
1435 &afs_dir_fops, /* file operations for directories */
1443 NULL, /* afs_linux_mknod */
1445 NULL, /* afs_linux_readlink */
1446 NULL, /* afs_linux_follow_link */
1447 NULL, /* afs_linux_readpage */
1448 NULL, /* afs_linux_writepage */
1449 NULL, /* afs_linux_bmap */
1450 NULL, /* afs_linux_truncate */
1451 afs_linux_permission,
1452 NULL, /* afs_linux_smap */
1453 NULL, /* afs_linux_updatepage */
1454 afs_linux_revalidate,
1458 /* We really need a separate symlink set of ops, since do_follow_link()
1459 * determines if it _is_ a link by checking if the follow_link op is set.
1461 #if defined(AFS_LINUX24_ENV)
1462 static int afs_symlink_filler(struct file *file, struct page *page)
1464 struct inode *ip = (struct inode *) page->mapping->host;
1465 char *p = (char *)kmap(page);
1470 code = afs_linux_ireadlink(ip, p, PAGE_SIZE, AFS_UIOSYS);
1476 p[code] = '\0'; /* null terminate? */
1477 SetPageUptodate(page);
1489 struct address_space_operations afs_symlink_aops = {
1490 readpage: afs_symlink_filler
1493 struct inode_operations afs_symlink_iops = {
1494 readlink: page_readlink,
1495 follow_link: page_follow_link,
1496 setattr: afs_notify_change,
1499 struct inode_operations afs_symlink_iops = {
1500 NULL, /* file operations */
1508 NULL, /* afs_linux_mknod */
1511 afs_linux_follow_link,
1512 NULL, /* readpage */
1513 NULL, /* afs_linux_writepage */
1514 NULL, /* afs_linux_bmap */
1515 NULL, /* afs_linux_truncate */
1516 afs_linux_permission, /* tho the code appears to indicate not used? */
1517 NULL, /* afs_linux_smap */
1518 NULL, /* updatepage */
1519 afs_linux_revalidate, /* tho the code appears to indicate not used? */