#include "afs/sysincludes.h"
#include "afsincludes.h"
#include "afs/afs_stats.h"
-#include "afs/afs_osidnlc.h"
#include "h/mm.h"
#ifdef HAVE_MM_INLINE_H
#include "h/mm_inline.h"
extern int afs_xioctl(struct inode *ip, struct file *fp, unsigned int com,
unsigned long arg);
+#if defined(HAVE_UNLOCKED_IOCTL) || defined(HAVE_COMPAT_IOCTL)
+static long afs_unlocked_xioctl(struct file *fp, unsigned int com,
+ unsigned long arg) {
+ return afs_xioctl(FILE_INODE(fp), fp, com, arg);
+
+}
+#endif
/* We need to detect unmap's after close. To do that, we need our own
* vm_operations_struct's. And we need to set them up for both the
if (!code)
code = afs_VerifyVCache(vcp, &treq);
+ if (!code && (vcp->states & CRO) &&
+ (vmap->vm_file->f_flags & (FWRITE | FTRUNC)))
+ code = EACCES;
if (code)
code = -code;
return -code;
}
-/* afs_Close is called from release, since release is used to handle all
- * file closings. In addition afs_linux_flush is called from sys_close to
- * handle flushing the data back to the server. The kicker is that we could
- * ignore flush completely if only sys_close took it's return value from
- * fput. See afs_linux_flush for notes on interactions between release and
- * flush.
- */
static int
afs_linux_release(struct inode *ip, struct file *fp)
{
- int code = 0;
- cred_t *credp = crref();
struct vcache *vcp = ITOAFS(ip);
+ cred_t *credp = crref();
+ int code = 0;
#ifdef AFS_LINUX24_ENV
lock_kernel();
#endif
AFS_GLOCK();
- if (vcp->flushcnt) {
- vcp->flushcnt--; /* protected by AFS global lock. */
- } else {
- code = afs_close(vcp, fp->f_flags, credp);
- }
+ code = afs_close(vcp, fp->f_flags, credp);
AFS_GUNLOCK();
#ifdef AFS_LINUX24_ENV
unlock_kernel();
}
/* afs_linux_flush
- * flush is called from sys_close. We could ignore it, but sys_close return
- * code comes from flush, not release. We need to use release to keep
- * the vcache open count correct. Note that flush is called before release
- * (via fput) in sys_close. vcp->flushcnt is a bit of ugliness to avoid
- * races and also avoid calling afs_close twice when closing the file.
- * If we merely checked for opens > 0 in afs_linux_release, then if an
- * new open occurred when storing back the file, afs_linux_release would
- * incorrectly close the file and decrement the opens count. Calling afs_close
- * on the just flushed file is wasteful, since the background daemon will
- * execute the code that finally decides there is nothing to do.
+ * essentially the same as afs_fsync() but we need to get the return
+ * code for the sys_close() here, not afs_linux_release(), so call
+ * afs_StoreAllSegments() with AFS_LASTSTORE
*/
int
afs_linux_flush(struct file *fp)
{
+ struct vrequest treq;
struct vcache *vcp = ITOAFS(FILE_INODE(fp));
- int code = 0;
- cred_t *credp;
+ cred_t *credp = crref();
+ int code;
- /* Only do this on the last close of the file pointer. */
-#if defined(AFS_LINUX24_ENV)
- if (atomic_read(&fp->f_count) > 1)
-#else
- if (fp->f_count > 1)
-#endif
- return 0;
+ AFS_GLOCK();
- credp = crref();
+ code = afs_InitReq(&treq, credp);
+ if (code)
+ goto out;
- AFS_GLOCK();
- code = afs_close(vcp, fp->f_flags, credp);
- vcp->flushcnt++; /* protected by AFS global lock. */
+ ObtainSharedLock(&vcp->lock, 535);
+ if (vcp->execsOrWriters > 0) {
+ UpgradeSToWLock(&vcp->lock, 536);
+ code = afs_StoreAllSegments(vcp, &treq, AFS_SYNC | AFS_LASTSTORE);
+ ConvertWToSLock(&vcp->lock);
+ }
+ code = afs_CheckCode(code, &treq, 54);
+ ReleaseSharedLock(&vcp->lock);
+
+out:
AFS_GUNLOCK();
crfree(credp);
.read = generic_read_dir,
#endif
.readdir = afs_linux_readdir,
+#ifdef HAVE_UNLOCKED_IOCTL
+ .unlocked_ioctl = afs_unlocked_xioctl,
+#else
.ioctl = afs_xioctl,
+#endif
+#ifdef HAVE_COMPAT_IOCTL
+ .compat_ioctl = afs_unlocked_xioctl,
+#endif
.open = afs_linux_open,
.release = afs_linux_release,
};
struct file_operations afs_file_fops = {
.read = afs_linux_read,
.write = afs_linux_write,
+#ifdef HAVE_UNLOCKED_IOCTL
+ .unlocked_ioctl = afs_unlocked_xioctl,
+#else
.ioctl = afs_xioctl,
+#endif
+#ifdef HAVE_COMPAT_IOCTL
+ .compat_ioctl = afs_unlocked_xioctl,
+#endif
.mmap = afs_linux_mmap,
.open = afs_linux_open,
.flush = afs_linux_flush,
afs_linux_dentry_revalidate(struct dentry *dp)
#endif
{
- char *name = NULL;
- cred_t *credp = crref();
+ cred_t *credp = NULL;
struct vrequest treq;
- struct vcache *lookupvcp = NULL;
- int code, bad_dentry = 1;
- struct sysname_info sysState;
+ int code, bad_dentry;
struct vcache *vcp, *parentvcp;
- sysState.allocked = 0;
-
#ifdef AFS_LINUX24_ENV
lock_kernel();
#endif
AFS_GLOCK();
vcp = ITOAFS(dp->d_inode);
- parentvcp = ITOAFS(dp->d_parent->d_inode);
-
- /* If it's a negative dentry, then there's nothing to do. */
- if (!vcp || !parentvcp)
- goto done;
+ parentvcp = ITOAFS(dp->d_parent->d_inode); /* dget_parent()? */
- /* If it is the AFS root, then there's no chance it needs
- * revalidating */
- if (vcp == afs_globalVp) {
- bad_dentry = 0;
+ /* If it's a negative dentry, it's never valid */
+ if (!vcp || !parentvcp) {
+ bad_dentry = 1;
goto done;
}
- if ((code = afs_InitReq(&treq, credp)))
+ /* If it's @sys, perhaps it has been changed */
+ if (!afs_ENameOK(dp->d_name.name)) {
+ bad_dentry = 10;
goto done;
+ }
- Check_AtSys(parentvcp, dp->d_name.name, &sysState, &treq);
- name = sysState.name;
+ /* If it's the AFS root no chance it needs revalidating */
+ if (vcp == afs_globalVp)
+ goto good_dentry;
- /* First try looking up the DNLC */
- if ((lookupvcp = osi_dnlc_lookup(parentvcp, name, WRITE_LOCK))) {
- /* Verify that the dentry does not point to an old inode */
- if (vcp != lookupvcp)
- goto done;
- /* Check and correct mvid */
- if (*name != '/' && vcp->mvstat == 2)
- check_bad_parent(dp);
- vcache2inode(vcp);
- bad_dentry = 0;
+ /* Get a validated vcache entry */
+ credp = crref();
+ code = afs_InitReq(&treq, credp);
+ if (code) {
+ bad_dentry = 2;
+ goto done;
+ }
+ code = afs_VerifyVCache(vcp, &treq);
+ if (code) {
+ bad_dentry = 3;
goto done;
}
- /* A DNLC lookup failure cannot be trusted. Try a real lookup.
- Make sure to try the real name and not the @sys expansion;
- afs_lookup will expand @sys itself. */
-
- code = afs_lookup(parentvcp, dp->d_name.name, &lookupvcp, credp);
+ /* If we aren't the last looker, verify access */
+ if (vcp->last_looker != treq.uid) {
+ if (!afs_AccessOK(vcp, (vType(vcp) == VREG) ? PRSFS_READ : PRSFS_LOOKUP, &treq, CHECK_MODE_BITS)) {
+ bad_dentry = 5;
+ goto done;
+ }
- /* Verify that the dentry does not point to an old inode */
- if (vcp != lookupvcp)
- goto done;
+ vcp->last_looker = treq.uid;
+ }
+ good_dentry:
bad_dentry = 0;
done:
/* Clean up */
- if (lookupvcp)
- afs_PutVCache(lookupvcp);
- if (sysState.allocked)
- osi_FreeLargeSpace(name);
-
AFS_GUNLOCK();
-
if (bad_dentry) {
shrink_dcache_parent(dp);
d_drop(dp);
}
-
#ifdef AFS_LINUX24_ENV
unlock_kernel();
#endif
- crfree(credp);
+ if (credp)
+ crfree(credp);
return !bad_dentry;
}
static void
afs_dentry_iput(struct dentry *dp, struct inode *ip)
{
- int isglock;
-
- if (ICL_SETACTIVE(afs_iclSetp)) {
- isglock = ISAFS_GLOCK();
- if (!isglock) AFS_GLOCK();
- afs_Trace3(afs_iclSetp, CM_TRACE_DENTRYIPUT, ICL_TYPE_POINTER, ip,
- ICL_TYPE_STRING, dp->d_parent->d_name.name,
- ICL_TYPE_STRING, dp->d_name.name);
- if (!isglock) AFS_GUNLOCK();
- }
-
osi_iput(ip);
}
#endif
static int
afs_dentry_delete(struct dentry *dp)
{
- int isglock;
- if (ICL_SETACTIVE(afs_iclSetp)) {
- isglock = ISAFS_GLOCK();
- if (!isglock) AFS_GLOCK();
- afs_Trace3(afs_iclSetp, CM_TRACE_DENTRYDELETE, ICL_TYPE_POINTER,
- dp->d_inode, ICL_TYPE_STRING, dp->d_parent->d_name.name,
- ICL_TYPE_STRING, dp->d_name.name);
- if (!isglock) AFS_GUNLOCK();
- }
-
if (dp->d_inode && (ITOAFS(dp->d_inode)->states & CUnlinked))
return 1; /* bad inode? */
#endif
dp->d_op = &afs_dentry_operations;
- dp->d_time = jiffies;
d_instantiate(dp, ip);
}
ip->i_op = &afs_symlink_iops;
#endif
}
- dp->d_time = jiffies;
dp->d_op = &afs_dentry_operations;
d_add(dp, AFSTOI(vcp));
tvcp->v.v_fop = &afs_dir_fops;
#endif
dp->d_op = &afs_dentry_operations;
- dp->d_time = jiffies;
d_instantiate(dp, AFSTOI(tvcp));
}
cred_t *credp = crref();
const char *oldname = olddp->d_name.name;
const char *newname = newdp->d_name.name;
-
-#if defined(AFS_LINUX26_ENV)
struct dentry *rehash = NULL;
+#if defined(AFS_LINUX26_ENV)
+ /* Prevent any new references during rename operation. */
lock_kernel();
#endif
/* Remove old and new entries from name hash. New one will change below.
d_drop(newdp);
rehash = newdp;
}
-
-#ifdef maybe
- if (atomic_read(&olddp->d_count) > 1) {
- printk("afs_linux_rename::shrink_dcache_parent()\n");
- shrink_dcache_parent(olddp);
- }
-#endif
#else
- if (!list_empty(&olddp->d_hash))
- d_drop(olddp);
- if (!list_empty(&newdp->d_hash))
+ if (!list_empty(&newdp->d_hash)) {
d_drop(newdp);
+ rehash = newdp;
+ }
+#endif
+
+#if defined(AFS_LINUX24_ENV)
+ if (atomic_read(&olddp->d_count) > 1)
+ shrink_dcache_parent(olddp);
#endif
+
AFS_GLOCK();
code = afs_rename(ITOAFS(oldip), oldname, ITOAFS(newip), newname, credp);
AFS_GUNLOCK();
-
-#if defined(AFS_LINUX26_ENV)
if (rehash)
d_rehash(rehash);
+#if defined(AFS_LINUX26_ENV)
unlock_kernel();
#endif
if (pp->index >= end_index + 1 || !offset)
return -EIO;
do_it:
- AFS_GLOCK();
status = afs_linux_writepage_sync(inode, pp, 0, offset);
- AFS_GUNLOCK();
SetPageUptodate(pp);
UnlockPage(pp);
if (status == offset)
base = (pp->index << PAGE_CACHE_SHIFT) + offset;
credp = crref();
+ lock_kernel();
+ AFS_GLOCK();
afs_Trace4(afs_iclSetp, CM_TRACE_UPDATEPAGE, ICL_TYPE_POINTER, vcp,
ICL_TYPE_POINTER, pp, ICL_TYPE_INT32, page_count(pp),
ICL_TYPE_INT32, 99999);
ICL_TYPE_POINTER, pp, ICL_TYPE_INT32, page_count(pp),
ICL_TYPE_INT32, code);
+ AFS_GUNLOCK();
+ unlock_kernel();
crfree(credp);
kunmap(pp);
return code;
}
-static int
-afs_linux_updatepage(struct file *file, struct page *page,
- unsigned long offset, unsigned int count)
-{
- struct dentry *dentry = file->f_dentry;
-
- return afs_linux_writepage_sync(dentry->d_inode, page, offset, count);
-}
#else
/* afs_linux_updatepage
* What one would have thought was writepage - write dirty page to file.
{
int code;
- lock_kernel();
- AFS_GLOCK();
- code = afs_linux_updatepage(file, page, offset, to - offset);
- AFS_GUNLOCK();
- unlock_kernel();
+ code = afs_linux_writepage_sync(file->f_dentry->d_inode, page,
+ offset, to - offset);
+#if !defined(AFS_LINUX26_ENV)
kunmap(page);
+#endif
return code;
}
afs_linux_prepare_write(struct file *file, struct page *page, unsigned from,
unsigned to)
{
+/* sometime between 2.4.0 and 2.4.19, the callers of prepare_write began to
+ call kmap directly instead of relying on us to do it */
+#if !defined(AFS_LINUX26_ENV)
kmap(page);
+#endif
return 0;
}
.follow_link = page_follow_link,
#else
.follow_link = page_follow_link_light,
+ .put_link = page_put_link,
#endif
.setattr = afs_notify_change,
#else
git://git.openafs.org / openafs.git / blobdiff