예제 #1
0
static long nfs42_fallocate(struct file *filep, int mode, loff_t offset, loff_t len)
{
	struct inode *inode = file_inode(filep);
	long ret;

	if (!S_ISREG(inode->i_mode))
		return -EOPNOTSUPP;

	if ((mode != 0) && (mode != (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE)))
		return -EOPNOTSUPP;

	ret = inode_newsize_ok(inode, offset + len);
	if (ret < 0)
		return ret;

	mutex_lock(&inode->i_mutex);
	if (mode & FALLOC_FL_PUNCH_HOLE)
		ret = nfs42_proc_deallocate(filep, offset, len);
	else
		ret = nfs42_proc_allocate(filep, offset, len);
	mutex_unlock(&inode->i_mutex);

	nfs_zap_caches(inode);
	return ret;
}
/*
 * Following a failed create operation, we drop the dentry rather
 * than retain a negative dentry. This avoids a problem in the event
 * that the operation succeeded on the server, but an error in the
 * reply path made it appear to have failed.
 */
static int nfs_create(struct inode *dir, struct dentry *dentry, int mode)
{
	struct iattr attr;
	struct nfs_fattr fattr;
	struct nfs_fh fhandle;
	int error;

	dfprintk(VFS, "NFS: create(%x/%ld, %s\n",
		dir->i_dev, dir->i_ino, dentry->d_name.name);

	attr.ia_mode = mode;
	attr.ia_valid = ATTR_MODE;

	/*
	 * The 0 argument passed into the create function should one day
	 * contain the O_EXCL flag if requested. This allows NFSv3 to
	 * select the appropriate create strategy. Currently open_namei
	 * does not pass the create flags.
	 */
	nfs_zap_caches(dir);
	error = NFS_PROTO(dir)->create(dir, &dentry->d_name,
					 &attr, 0, &fhandle, &fattr);
	if (!error)
		error = nfs_instantiate(dentry, &fhandle, &fattr);
	else
		d_drop(dentry);
	return error;
}
/*
 * See comments for nfs_proc_create regarding failed operations.
 */
static int nfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
{
	struct iattr attr;
	struct nfs_fattr fattr;
	struct nfs_fh fhandle;
	int error;

	dfprintk(VFS, "NFS: mkdir(%x/%ld, %s\n",
		dir->i_dev, dir->i_ino, dentry->d_name.name);

	attr.ia_valid = ATTR_MODE;
	attr.ia_mode = mode | S_IFDIR;

#if 0
	/*
	 * Always drop the dentry, we can't always depend on
	 * the fattr returned by the server (AIX seems to be
	 * broken). We're better off doing another lookup than
	 * depending on potentially bogus information.
	 */
	d_drop(dentry);
#endif
	nfs_zap_caches(dir);
	error = NFS_PROTO(dir)->mkdir(dir, &dentry->d_name, &attr, &fhandle,
					&fattr);
	if (!error)
		error = nfs_instantiate(dentry, &fhandle, &fattr);
	else
		d_drop(dentry);
	return error;
}
/*
 * This is called every time the dcache has a lookup hit,
 * and we should check whether we can really trust that
 * lookup.
 *
 * NOTE! The hit can be a negative hit too, don't assume
 * we have an inode!
 *
 * If the parent directory is seen to have changed, we throw out the
 * cached dentry and do a new lookup.
 */
static int nfs_lookup_revalidate(struct dentry * dentry, int flags)
{
	struct inode *dir;
	struct inode *inode;
	int error;
	struct nfs_fh fhandle;
	struct nfs_fattr fattr;

	lock_kernel();
	dir = dentry->d_parent->d_inode;
	inode = dentry->d_inode;

	if (!inode) {
		if (nfs_neg_need_reval(dir, dentry))
			goto out_bad;
		goto out_valid;
	}

	if (is_bad_inode(inode)) {
		dfprintk(VFS, "nfs_lookup_validate: %s/%s has dud inode\n",
			dentry->d_parent->d_name.name, dentry->d_name.name);
		goto out_bad;
	}

	/* Force a full look up iff the parent directory has changed */
	if (nfs_check_verifier(dir, dentry)) {
		if (nfs_lookup_verify_inode(inode, flags))
			goto out_bad;
		goto out_valid;
	}

	if (NFS_STALE(inode))
		goto out_bad;

	error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, &fhandle, &fattr);
	if (error)
		goto out_bad;
	if (memcmp(NFS_FH(inode), &fhandle, sizeof(struct nfs_fh))!= 0)
		goto out_bad;
	if ((error = nfs_refresh_inode(inode, &fattr)) != 0)
		goto out_bad;

	nfs_renew_times(dentry);
 out_valid:
	unlock_kernel();
	return 1;
 out_bad:
	NFS_CACHEINV(dir);
	if (inode && S_ISDIR(inode->i_mode)) {
		/* Purge readdir caches. */
		nfs_zap_caches(inode);
		/* If we have submounts, don't unhash ! */
		if (have_submounts(dentry))
			goto out_valid;
		shrink_dcache_parent(dentry);
	}
	d_drop(dentry);
	unlock_kernel();
	return 0;
}
예제 #5
0
static int do_setlk(struct file *filp, int cmd, struct file_lock *fl)
{
	struct inode *inode = filp->f_mapping->host;
	int status;

	/*
	 * Flush all pending writes before doing anything
	 * with locks..
	 */
	status = nfs_sync_mapping(filp->f_mapping);
	if (status != 0)
		goto out;

	/* Use local locking if mounted with "-onolock" */
	if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM))
		status = NFS_PROTO(inode)->lock(filp, cmd, fl);
	else
		status = do_vfs_lock(filp, fl);
	if (status < 0)
		goto out;
	/*
	 * Make sure we clear the cache whenever we try to get the lock.
	 * This makes locking act as a cache coherency point.
	 */
	nfs_sync_mapping(filp->f_mapping);
	if (!nfs_have_delegation(inode, FMODE_READ))
		nfs_zap_caches(inode);
out:
	return status;
}
예제 #6
0
/*
 * Invalidate, but do not unhash, the inode
 */
static void
nfs_invalidate_inode(struct inode *inode)
{
    umode_t save_mode = inode->i_mode;

    make_bad_inode(inode);
    inode->i_mode = save_mode;
    nfs_inval(inode);
    nfs_zap_caches(inode);
}
예제 #7
0
파일: file.c 프로젝트: kzlin129/tt-gpl
static int do_setlk(struct file *filp, int cmd, struct file_lock *fl)
{
	struct inode *inode = filp->f_mapping->host;
	sigset_t oldset;
	int status;

	rpc_clnt_sigmask(NFS_CLIENT(inode), &oldset);
	/*
	 * Flush all pending writes before doing anything
	 * with locks..
	 */
	status = filemap_fdatawrite(filp->f_mapping);
	if (status == 0) {
		down(&inode->i_sem);
		status = nfs_wb_all(inode);
		up(&inode->i_sem);
		if (status == 0)
			status = filemap_fdatawait(filp->f_mapping);
	}
	if (status < 0)
		goto out;

	lock_kernel();
	/* Use local locking if mounted with "-onolock" */
	if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) {
		status = NFS_PROTO(inode)->lock(filp, cmd, fl);
		/* If we were signalled we still need to ensure that
		 * we clean up any state on the server. We therefore
		 * record the lock call as having succeeded in order to
		 * ensure that locks_remove_posix() cleans it out when
		 * the process exits.
		 */
		if (status == -EINTR || status == -ERESTARTSYS)
			do_vfs_lock(filp, fl);
	} else
		status = do_vfs_lock(filp, fl);
	unlock_kernel();
	if (status < 0)
		goto out;
	/*
	 * Make sure we clear the cache whenever we try to get the lock.
	 * This makes locking act as a cache coherency point.
	 */
	filemap_fdatawrite(filp->f_mapping);
	down(&inode->i_sem);
	nfs_wb_all(inode);	/* we may have slept */
	up(&inode->i_sem);
	filemap_fdatawait(filp->f_mapping);
	nfs_zap_caches(inode);
out:
	rpc_clnt_sigunmask(NFS_CLIENT(inode), &oldset);
	return status;
}
static int nfs_rmdir(struct inode *dir, struct dentry *dentry)
{
	int error;

	dfprintk(VFS, "NFS: rmdir(%x/%ld, %s\n",
		dir->i_dev, dir->i_ino, dentry->d_name.name);

	nfs_zap_caches(dir);
	error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name);
	if (!error)
		dentry->d_inode->i_nlink = 0;

	return error;
}
/*
 * Remove a file after making sure there are no pending writes,
 * and after checking that the file has only one user. 
 *
 * We invalidate the attribute cache and free the inode prior to the operation
 * to avoid possible races if the server reuses the inode.
 */
static int nfs_safe_remove(struct dentry *dentry)
{
	struct inode *dir = dentry->d_parent->d_inode;
	struct inode *inode = dentry->d_inode;
	int error = -EBUSY, rehash = 0;
		
	dfprintk(VFS, "NFS: safe_remove(%s/%s)\n",
		dentry->d_parent->d_name.name, dentry->d_name.name);

	/*
	 * Unhash the dentry while we remove the file ...
	 */
	if (!d_unhashed(dentry)) {
		d_drop(dentry);
		rehash = 1;
	}
	if (atomic_read(&dentry->d_count) > 1) {
#ifdef NFS_PARANOIA
		printk("nfs_safe_remove: %s/%s busy, d_count=%d\n",
			dentry->d_parent->d_name.name, dentry->d_name.name,
			atomic_read(&dentry->d_count));
#endif
		goto out;
	}

	/* If the dentry was sillyrenamed, we simply call d_delete() */
	if (dentry->d_flags & DCACHE_NFSFS_RENAMED) {
		error = 0;
		goto out_delete;
	}

	nfs_zap_caches(dir);
	if (inode)
		NFS_CACHEINV(inode);
	error = NFS_PROTO(dir)->remove(dir, &dentry->d_name);
	if (error < 0)
		goto out;
	if (inode)
		inode->i_nlink--;

 out_delete:
	/*
	 * Free the inode
	 */
	d_delete(dentry);
out:
	if (rehash)
		d_rehash(dentry);
	return error;
}
static int
nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
{
	struct iattr attr;
	struct nfs_fattr sym_attr;
	struct nfs_fh sym_fh;
	struct qstr qsymname;
	unsigned int maxlen;
	int error;

	dfprintk(VFS, "NFS: symlink(%x/%ld, %s, %s)\n",
		dir->i_dev, dir->i_ino, dentry->d_name.name, symname);

	error = -ENAMETOOLONG;
	maxlen = (NFS_PROTO(dir)->version==2) ? NFS2_MAXPATHLEN : NFS3_MAXPATHLEN;
	if (strlen(symname) > maxlen)
		goto out;

#ifdef NFS_PARANOIA
if (dentry->d_inode)
printk("nfs_proc_symlink: %s/%s not negative!\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
#endif
	/*
	 * Fill in the sattr for the call.
 	 * Note: SunOS 4.1.2 crashes if the mode isn't initialized!
	 */
	attr.ia_valid = ATTR_MODE;
	attr.ia_mode = S_IFLNK | S_IRWXUGO;

	qsymname.name = symname;
	qsymname.len  = strlen(symname);

	nfs_zap_caches(dir);
	error = NFS_PROTO(dir)->symlink(dir, &dentry->d_name, &qsymname,
					  &attr, &sym_fh, &sym_attr);
	if (!error) {
		error = nfs_instantiate(dentry, &sym_fh, &sym_attr);
	} else {
		if (error == -EEXIST)
			printk("nfs_proc_symlink: %s/%s already exists??\n",
			       dentry->d_parent->d_name.name, dentry->d_name.name);
		d_drop(dentry);
	}

out:
	return error;
}
예제 #11
0
파일: race8.c 프로젝트: FeifeiWang7/Exploit
static int do_setlk(struct file *filp, int cmd, struct file_lock *fl)
{
	struct inode *inode = filp->f_mapping->host;
	int status;

	/*
	 * Flush all pending writes before doing anything
	 * with locks..
	 */
	status = filemap_fdatawrite(filp->f_mapping);
	if (status == 0) {
		down(&inode->i_sem);
		status = nfs_wb_all(inode);
		up(&inode->i_sem);
		if (status == 0)
			status = filemap_fdatawait(filp->f_mapping);
	}
	if (status < 0)
		return status;

	lock_kernel();
	status = NFS_PROTO(inode)->lock(filp, cmd, fl);
	/* If we were signalled we still need to ensure that
	 * we clean up any state on the server. We therefore
	 * record the lock call as having succeeded in order to
	 * ensure that locks_remove_posix() cleans it out when
	 * the process exits.
	 */
	if (status == -EINTR || status == -ERESTARTSYS)
		posix_lock_file(filp, fl);
	unlock_kernel();
	if (status < 0)
		return status;
	/*
	 * Make sure we clear the cache whenever we try to get the lock.
	 * This makes locking act as a cache coherency point.
	 */
	filemap_fdatawrite(filp->f_mapping);
	down(&inode->i_sem);
	nfs_wb_all(inode);	/* we may have slept */
	up(&inode->i_sem);
	filemap_fdatawait(filp->f_mapping);
	nfs_zap_caches(inode);
	return 0;
}
예제 #12
0
/* Now we cache directories properly, by stuffing the dirent
 * data directly in the page cache.
 *
 * Inode invalidation due to refresh etc. takes care of
 * _everything_, no sloppy entry flushing logic, no extraneous
 * copying, network direct to page cache, the way it was meant
 * to be.
 *
 * NOTE: Dirent information verification is done always by the
 *	 page-in of the RPC reply, nowhere else, this simplies
 *	 things substantially.
 */
static
int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page *page)
{
	struct file	*file = desc->file;
	struct inode	*inode = file->f_dentry->d_inode;
	struct rpc_cred	*cred = nfs_file_cred(file);
	unsigned long	timestamp;
	int		error;

	dfprintk(VFS, "NFS: nfs_readdir_filler() reading cookie %Lu into page %lu.\n", (long long)desc->entry->cookie, page->index);

 again:
	timestamp = jiffies;
	error = NFS_PROTO(inode)->readdir(file->f_dentry, cred, desc->entry->cookie, page,
					  NFS_SERVER(inode)->dtsize, desc->plus);
	if (error < 0) {
		/* We requested READDIRPLUS, but the server doesn't grok it */
		if (error == -ENOTSUPP && desc->plus) {
			NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS;
			NFS_FLAGS(inode) &= ~NFS_INO_ADVISE_RDPLUS;
			desc->plus = 0;
			goto again;
		}
		goto error;
	}
	SetPageUptodate(page);
	NFS_FLAGS(inode) |= NFS_INO_INVALID_ATIME;
	/* Ensure consistent page alignment of the data.
	 * Note: assumes we have exclusive access to this mapping either
	 *	 throught inode->i_sem or some other mechanism.
	 */
	if (page->index == 0) {
		invalidate_inode_pages(inode->i_mapping);
		NFS_I(inode)->readdir_timestamp = timestamp;
	}
	unlock_page(page);
	return 0;
 error:
	SetPageError(page);
	unlock_page(page);
	nfs_zap_caches(inode);
	desc->error = error;
	return -EIO;
}
예제 #13
0
static int
do_setlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
{
	struct inode *inode = filp->f_mapping->host;
	int status;

	/*
	 * Flush all pending writes before doing anything
	 * with locks..
	 */
	status = nfs_sync_mapping(filp->f_mapping);
	if (status != 0)
		goto out;

	/*
	 * Use local locking if mounted with "-onolock" or with appropriate
	 * "-olocal_lock="
	 */
	if (!is_local)
		status = NFS_PROTO(inode)->lock(filp, cmd, fl);
	else
		status = do_vfs_lock(filp, fl);
	if (status < 0)
		goto out;

	/*
	 * Revalidate the cache if the server has time stamps granular
	 * enough to detect subsecond changes.  Otherwise, clear the
	 * cache to prevent missing any changes.
	 *
	 * This makes locking act as a cache coherency point.
	 */
	nfs_sync_mapping(filp->f_mapping);
	if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) {
		if (is_time_granular(&NFS_SERVER(inode)->time_delta))
			__nfs_revalidate_inode(NFS_SERVER(inode), inode);
		else
			nfs_zap_caches(inode);
	}
out:
	return status;
}
static int 
nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
{
	struct inode *inode = old_dentry->d_inode;
	int error;

	dfprintk(VFS, "NFS: link(%s/%s -> %s/%s)\n",
		old_dentry->d_parent->d_name.name, old_dentry->d_name.name,
		dentry->d_parent->d_name.name, dentry->d_name.name);

	/*
	 * Drop the dentry in advance to force a new lookup.
	 * Since nfs_proc_link doesn't return a file handle,
	 * we can't use the existing dentry.
	 */
	d_drop(dentry);
	nfs_zap_caches(dir);
	NFS_CACHEINV(inode);
	error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name);
	return error;
}
예제 #15
0
static int do_setlk(struct file *filp, int cmd, struct file_lock *fl)
{
	struct inode *inode = filp->f_mapping->host;
	int status;

	/*
	 * Flush all pending writes before doing anything
	 * with locks..
	 */
	status = nfs_sync_mapping(filp->f_mapping);
	if (status != 0)
		goto out;

	lock_kernel();
	/* Use local locking if mounted with "-onolock" */
	if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) {
		status = NFS_PROTO(inode)->lock(filp, cmd, fl);
		/* If we were signalled we still need to ensure that
		 * we clean up any state on the server. We therefore
		 * record the lock call as having succeeded in order to
		 * ensure that locks_remove_posix() cleans it out when
		 * the process exits.
		 */
		if (status == -EINTR || status == -ERESTARTSYS)
			do_vfs_lock(filp, fl);
	} else
		status = do_vfs_lock(filp, fl);
	unlock_kernel();
	if (status < 0)
		goto out;
	/*
	 * Make sure we clear the cache whenever we try to get the lock.
	 * This makes locking act as a cache coherency point.
	 */
	nfs_sync_mapping(filp->f_mapping);
	nfs_zap_caches(inode);
out:
	return status;
}
/*
 * See comments for nfs_proc_create regarding failed operations.
 */
static int nfs_mknod(struct inode *dir, struct dentry *dentry, int mode, int rdev)
{
	struct iattr attr;
	struct nfs_fattr fattr;
	struct nfs_fh fhandle;
	int error;

	dfprintk(VFS, "NFS: mknod(%x/%ld, %s\n",
		dir->i_dev, dir->i_ino, dentry->d_name.name);

	attr.ia_mode = mode;
	attr.ia_valid = ATTR_MODE;

	nfs_zap_caches(dir);
	error = NFS_PROTO(dir)->mknod(dir, &dentry->d_name, &attr, rdev,
					&fhandle, &fattr);
	if (!error)
		error = nfs_instantiate(dentry, &fhandle, &fattr);
	else
		d_drop(dentry);
	return error;
}
/*
 * RENAME
 * FIXME: Some nfsds, like the Linux user space nfsd, may generate a
 * different file handle for the same inode after a rename (e.g. when
 * moving to a different directory). A fail-safe method to do so would
 * be to look up old_dir/old_name, create a link to new_dir/new_name and
 * rename the old file using the sillyrename stuff. This way, the original
 * file in old_dir will go away when the last process iput()s the inode.
 *
 * FIXED.
 * 
 * It actually works quite well. One needs to have the possibility for
 * at least one ".nfs..." file in each directory the file ever gets
 * moved or linked to which happens automagically with the new
 * implementation that only depends on the dcache stuff instead of
 * using the inode layer
 *
 * Unfortunately, things are a little more complicated than indicated
 * above. For a cross-directory move, we want to make sure we can get
 * rid of the old inode after the operation.  This means there must be
 * no pending writes (if it's a file), and the use count must be 1.
 * If these conditions are met, we can drop the dentries before doing
 * the rename.
 */
static int nfs_rename(struct inode *old_dir, struct dentry *old_dentry,
		      struct inode *new_dir, struct dentry *new_dentry)
{
	struct inode *old_inode = old_dentry->d_inode;
	struct inode *new_inode = new_dentry->d_inode;
	struct dentry *dentry = NULL, *rehash = NULL;
	int error = -EBUSY;

	/*
	 * To prevent any new references to the target during the rename,
	 * we unhash the dentry and free the inode in advance.
	 */
	if (!d_unhashed(new_dentry)) {
		d_drop(new_dentry);
		rehash = new_dentry;
	}

	dfprintk(VFS, "NFS: rename(%s/%s -> %s/%s, ct=%d)\n",
		 old_dentry->d_parent->d_name.name, old_dentry->d_name.name,
		 new_dentry->d_parent->d_name.name, new_dentry->d_name.name,
		 atomic_read(&new_dentry->d_count));

	/*
	 * First check whether the target is busy ... we can't
	 * safely do _any_ rename if the target is in use.
	 *
	 * For files, make a copy of the dentry and then do a 
	 * silly-rename. If the silly-rename succeeds, the
	 * copied dentry is hashed and becomes the new target.
	 */
	if (!new_inode)
		goto go_ahead;
	if (S_ISDIR(new_inode->i_mode))
		goto out;
	else if (atomic_read(&new_dentry->d_count) > 1) {
		int err;
		/* copy the target dentry's name */
		dentry = d_alloc(new_dentry->d_parent,
				 &new_dentry->d_name);
		if (!dentry)
			goto out;

		/* silly-rename the existing target ... */
		err = nfs_sillyrename(new_dir, new_dentry);
		if (!err) {
			new_dentry = rehash = dentry;
			new_inode = NULL;
			/* instantiate the replacement target */
			d_instantiate(new_dentry, NULL);
		}

		/* dentry still busy? */
		if (atomic_read(&new_dentry->d_count) > 1) {
#ifdef NFS_PARANOIA
			printk("nfs_rename: target %s/%s busy, d_count=%d\n",
			       new_dentry->d_parent->d_name.name,
			       new_dentry->d_name.name,
			       atomic_read(&new_dentry->d_count));
#endif
			goto out;
		}
	}

go_ahead:
	/*
	 * ... prune child dentries and writebacks if needed.
	 */
	if (atomic_read(&old_dentry->d_count) > 1) {
		nfs_wb_all(old_inode);
		shrink_dcache_parent(old_dentry);
	}

	if (new_inode)
		d_delete(new_dentry);

	nfs_zap_caches(new_dir);
	nfs_zap_caches(old_dir);
	error = NFS_PROTO(old_dir)->rename(old_dir, &old_dentry->d_name,
					   new_dir, &new_dentry->d_name);
out:
	if (rehash)
		d_rehash(rehash);
	if (!error && !S_ISDIR(old_inode->i_mode))
		d_move(old_dentry, new_dentry);

	/* new dentry created? */
	if (dentry)
		dput(dentry);
	return error;
}
예제 #18
0
/*
 * This is called every time the dcache has a lookup hit,
 * and we should check whether we can really trust that
 * lookup.
 *
 * NOTE! The hit can be a negative hit too, don't assume
 * we have an inode!
 *
 * If the parent directory is seen to have changed, we throw out the
 * cached dentry and do a new lookup.
 */
static int nfs_lookup_revalidate(struct dentry * dentry, struct nameidata *nd)
{
	struct inode *dir;
	struct inode *inode;
	struct dentry *parent;
	int error;
	struct nfs_fh fhandle;
	struct nfs_fattr fattr;
	unsigned long verifier;
	int isopen = 0;

	parent = dget_parent(dentry);
	lock_kernel();
	dir = parent->d_inode;
	inode = dentry->d_inode;

	if (nd && !(nd->flags & LOOKUP_CONTINUE) && (nd->flags & LOOKUP_OPEN))
		isopen = 1;

	if (!inode) {
		if (nfs_neg_need_reval(dir, dentry, nd))
			goto out_bad;
		goto out_valid;
	}

	if (is_bad_inode(inode)) {
		dfprintk(VFS, "nfs_lookup_validate: %s/%s has dud inode\n",
			dentry->d_parent->d_name.name, dentry->d_name.name);
		goto out_bad;
	}

	/* Revalidate parent directory attribute cache */
	nfs_revalidate_inode(NFS_SERVER(dir), dir);

	/* Force a full look up iff the parent directory has changed */
	if (nfs_check_verifier(dir, dentry)) {
		if (nfs_lookup_verify_inode(inode, isopen))
			goto out_zap_parent;
		goto out_valid;
	}

	/*
	 * Note: we're not holding inode->i_sem and so may be racing with
	 * operations that change the directory. We therefore save the
	 * change attribute *before* we do the RPC call.
	 */
	verifier = nfs_save_change_attribute(dir);
	error = nfs_cached_lookup(dir, dentry, &fhandle, &fattr);
	if (!error) {
		if (memcmp(NFS_FH(inode), &fhandle, sizeof(struct nfs_fh))!= 0)
			goto out_bad;
		if (nfs_lookup_verify_inode(inode, isopen))
			goto out_zap_parent;
		goto out_valid_renew;
	}

	if (NFS_STALE(inode))
		goto out_bad;

	error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, &fhandle, &fattr);
	if (error)
		goto out_bad;
	if (memcmp(NFS_FH(inode), &fhandle, sizeof(struct nfs_fh))!= 0)
		goto out_bad;
	if ((error = nfs_refresh_inode(inode, &fattr)) != 0)
		goto out_bad;

 out_valid_renew:
	nfs_renew_times(dentry);
	nfs_set_verifier(dentry, verifier);
 out_valid:
	unlock_kernel();
	dput(parent);
	return 1;
out_zap_parent:
	nfs_zap_caches(dir);
 out_bad:
	NFS_CACHEINV(dir);
	if (inode && S_ISDIR(inode->i_mode)) {
		/* Purge readdir caches. */
		nfs_zap_caches(inode);
		/* If we have submounts, don't unhash ! */
		if (have_submounts(dentry))
			goto out_valid;
		shrink_dcache_parent(dentry);
	}
	d_drop(dentry);
	unlock_kernel();
	dput(parent);
	return 0;
}
static int nfs_sillyrename(struct inode *dir, struct dentry *dentry)
{
	static unsigned int sillycounter;
	const int      i_inosize  = sizeof(dir->i_ino)*2;
	const int      countersize = sizeof(sillycounter)*2;
	const int      slen       = strlen(".nfs") + i_inosize + countersize;
	char           silly[slen+1];
	struct qstr    qsilly;
	struct dentry *sdentry;
	int            error = -EIO;

	dfprintk(VFS, "NFS: silly-rename(%s/%s, ct=%d)\n",
		dentry->d_parent->d_name.name, dentry->d_name.name, 
		atomic_read(&dentry->d_count));

	if (atomic_read(&dentry->d_count) == 1)
		goto out;  /* No need to silly rename. */


#ifdef NFS_PARANOIA
if (!dentry->d_inode)
printk("NFS: silly-renaming %s/%s, negative dentry??\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
#endif
	/*
	 * We don't allow a dentry to be silly-renamed twice.
	 */
	error = -EBUSY;
	if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
		goto out;

	sprintf(silly, ".nfs%*.*lx",
		i_inosize, i_inosize, dentry->d_inode->i_ino);

	sdentry = NULL;
	do {
		char *suffix = silly + slen - countersize;

		dput(sdentry);
		sillycounter++;
		sprintf(suffix, "%*.*x", countersize, countersize, sillycounter);

		dfprintk(VFS, "trying to rename %s to %s\n",
			 dentry->d_name.name, silly);
		
		sdentry = lookup_one_len(silly, dentry->d_parent, slen);
		/*
		 * N.B. Better to return EBUSY here ... it could be
		 * dangerous to delete the file while it's in use.
		 */
		if (IS_ERR(sdentry))
			goto out;
	} while(sdentry->d_inode != NULL); /* need negative lookup */

	nfs_zap_caches(dir);
	qsilly.name = silly;
	qsilly.len  = strlen(silly);
	error = NFS_PROTO(dir)->rename(dir, &dentry->d_name, dir, &qsilly);
	if (!error) {
		nfs_renew_times(dentry);
		d_move(dentry, sdentry);
		error = nfs_async_unlink(dentry);
 		/* If we return 0 we don't unlink */
	}
	dput(sdentry);
out:
	return error;
}
예제 #20
0
파일: file.c 프로젝트: dmgerman/original
/*
 * Lock a (portion of) a file
 */
int
nfs_lock(struct file *filp, int cmd, struct file_lock *fl)
{
	struct inode * inode = filp->f_dentry->d_inode;
	int	status = 0;

	dprintk("NFS: nfs_lock(f=%4x/%ld, t=%x, fl=%x, r=%Ld:%Ld)\n",
			inode->i_dev, inode->i_ino,
			fl->fl_type, fl->fl_flags,
			(long long)fl->fl_start, (long long)fl->fl_end);

	if (!inode)
		return -EINVAL;

	/* No mandatory locks over NFS */
	if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
		return -ENOLCK;

	/* Fake OK code if mounted without NLM support */
	if (NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM) {
		if (cmd == F_GETLK)
			status = LOCK_USE_CLNT;
		goto out_ok;
	}

	/*
	 * No BSD flocks over NFS allowed.
	 * Note: we could try to fake a POSIX lock request here by
	 * using ((u32) filp | 0x80000000) or some such as the pid.
	 * Not sure whether that would be unique, though, or whether
	 * that would break in other places.
	 */
	if (!fl->fl_owner || (fl->fl_flags & (FL_POSIX|FL_BROKEN)) != FL_POSIX)
		return -ENOLCK;

	/*
	 * Flush all pending writes before doing anything
	 * with locks..
	 */
	down(&filp->f_dentry->d_inode->i_sem);
	status = nfs_wb_all(inode);
	up(&filp->f_dentry->d_inode->i_sem);
	if (status < 0)
		return status;

	if ((status = nlmclnt_proc(inode, cmd, fl)) < 0)
		return status;
	else
		status = 0;

	/*
	 * Make sure we clear the cache whenever we try to get the lock.
	 * This makes locking act as a cache coherency point.
	 */
 out_ok:
	if ((cmd == F_SETLK || cmd == F_SETLKW) && fl->fl_type != F_UNLCK) {
		down(&filp->f_dentry->d_inode->i_sem);
		nfs_wb_all(inode);      /* we may have slept */
		nfs_zap_caches(inode);
		up(&filp->f_dentry->d_inode->i_sem);
	}
	return status;
}
예제 #21
0
/* The file offset position is now represented as a true offset into the
 * page cache as is the case in most of the other filesystems.
 */
static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
	struct dentry	*dentry = filp->f_dentry;
	struct inode	*inode = dentry->d_inode;
	nfs_readdir_descriptor_t my_desc,
			*desc = &my_desc;
	struct nfs_entry my_entry;
	struct nfs_fh	 fh;
	struct nfs_fattr fattr;
	long		res;

	lock_kernel();

	res = nfs_revalidate_inode(NFS_SERVER(inode), inode);
	if (res < 0) {
		unlock_kernel();
		return res;
	}

	/*
	 * filp->f_pos points to the file offset in the page cache.
	 * but if the cache has meanwhile been zapped, we need to
	 * read from the last dirent to revalidate f_pos
	 * itself.
	 */
	memset(desc, 0, sizeof(*desc));

	desc->file = filp;
	desc->target = filp->f_pos;
	desc->decode = NFS_PROTO(inode)->decode_dirent;
	desc->plus = NFS_USE_READDIRPLUS(inode);

	my_entry.cookie = my_entry.prev_cookie = 0;
	my_entry.eof = 0;
	my_entry.fh = &fh;
	my_entry.fattr = &fattr;
	desc->entry = &my_entry;

	while(!desc->entry->eof) {
		res = readdir_search_pagecache(desc);
		if (res == -EBADCOOKIE) {
			/* This means either end of directory */
			if (desc->entry->cookie != desc->target) {
				/* Or that the server has 'lost' a cookie */
				res = uncached_readdir(desc, dirent, filldir);
				if (res >= 0)
					continue;
			}
			res = 0;
			break;
		}
		if (res == -ETOOSMALL && desc->plus) {
			NFS_FLAGS(inode) &= ~NFS_INO_ADVISE_RDPLUS;
			nfs_zap_caches(inode);
			desc->plus = 0;
			desc->entry->eof = 0;
			continue;
		}
		if (res < 0)
			break;

		res = nfs_do_filldir(desc, dirent, filldir);
		if (res < 0) {
			res = 0;
			break;
		}
	}
	unlock_kernel();
	if (desc->error < 0)
		return desc->error;
	if (res < 0)
		return res;
	return 0;
}