vfs.c 48.7 KB
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#define MSNFS	/* HACK HACK */
/*
 * linux/fs/nfsd/vfs.c
 *
 * File operations used by nfsd. Some of these have been ripped from
 * other parts of the kernel because they weren't exported, others
 * are partial duplicates with added or changed functionality.
 *
 * Note that several functions dget() the dentry upon which they want
 * to act, most notably those that create directory entries. Response
 * dentry's are dput()'d if necessary in the release callback.
 * So if you notice code paths that apparently fail to dput() the
 * dentry, don't worry--they have been taken care of.
 *
 * Copyright (C) 1995-1999 Olaf Kirch <okir@monad.swb.de>
 * Zerocpy NFS support (C) 2002 Hirokazu Takahashi <taka@valinux.co.jp>
 */

#include <linux/string.h>
#include <linux/time.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/mount.h>
#include <linux/major.h>
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#include <linux/splice.h>
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#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/fcntl.h>
#include <linux/net.h>
#include <linux/unistd.h>
#include <linux/slab.h>
#include <linux/pagemap.h>
#include <linux/in.h>
#include <linux/module.h>
#include <linux/namei.h>
#include <linux/vfs.h>
#include <linux/delay.h>
#include <linux/sunrpc/svc.h>
#include <linux/nfsd/nfsd.h>
#ifdef CONFIG_NFSD_V3
#include <linux/nfs3.h>
#include <linux/nfsd/xdr3.h>
#endif /* CONFIG_NFSD_V3 */
#include <linux/nfsd/nfsfh.h>
#include <linux/quotaops.h>
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#include <linux/fsnotify.h>
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#include <linux/posix_acl.h>
#include <linux/posix_acl_xattr.h>
#include <linux/xattr.h>
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#ifdef CONFIG_NFSD_V4
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#include <linux/nfs4.h>
#include <linux/nfs4_acl.h>
#include <linux/nfsd_idmap.h>
#include <linux/security.h>
#endif /* CONFIG_NFSD_V4 */
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#include <linux/jhash.h>
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#include <asm/uaccess.h>

#define NFSDDBG_FACILITY		NFSDDBG_FILEOP


/*
 * This is a cache of readahead params that help us choose the proper
 * readahead strategy. Initially, we set all readahead parameters to 0
 * and let the VFS handle things.
 * If you increase the number of cached files very much, you'll need to
 * add a hash table here.
 */
struct raparms {
	struct raparms		*p_next;
	unsigned int		p_count;
	ino_t			p_ino;
	dev_t			p_dev;
	int			p_set;
	struct file_ra_state	p_ra;
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	unsigned int		p_hindex;
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};

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struct raparm_hbucket {
	struct raparms		*pb_head;
	spinlock_t		pb_lock;
} ____cacheline_aligned_in_smp;

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static struct raparms *		raparml;
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#define RAPARM_HASH_BITS	4
#define RAPARM_HASH_SIZE	(1<<RAPARM_HASH_BITS)
#define RAPARM_HASH_MASK	(RAPARM_HASH_SIZE-1)
static struct raparm_hbucket	raparm_hash[RAPARM_HASH_SIZE];
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/* 
 * Called from nfsd_lookup and encode_dirent. Check if we have crossed 
 * a mount point.
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 * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged,
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 *  or nfs_ok having possibly changed *dpp and *expp
 */
int
nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp, 
		        struct svc_export **expp)
{
	struct svc_export *exp = *expp, *exp2 = NULL;
	struct dentry *dentry = *dpp;
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	struct vfsmount *mnt = mntget(exp->ex_path.mnt);
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	struct dentry *mounts = dget(dentry);
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	int err = 0;
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	while (follow_down(&mnt,&mounts)&&d_mountpoint(mounts));

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	exp2 = rqst_exp_get_by_name(rqstp, mnt, mounts);
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	if (IS_ERR(exp2)) {
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		if (PTR_ERR(exp2) != -ENOENT)
			err = PTR_ERR(exp2);
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		dput(mounts);
		mntput(mnt);
		goto out;
	}
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	if ((exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) {
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		/* successfully crossed mount point */
		exp_put(exp);
		*expp = exp2;
		dput(dentry);
		*dpp = mounts;
	} else {
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		exp_put(exp2);
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		dput(mounts);
	}
	mntput(mnt);
out:
	return err;
}

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__be32
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nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp,
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		   const char *name, unsigned int len,
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		   struct svc_export **exp_ret, struct dentry **dentry_ret)
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{
	struct svc_export	*exp;
	struct dentry		*dparent;
	struct dentry		*dentry;
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	__be32			err;
	int			host_err;
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	dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name);

	/* Obtain dentry and export. */
	err = fh_verify(rqstp, fhp, S_IFDIR, MAY_EXEC);
	if (err)
		return err;

	dparent = fhp->fh_dentry;
	exp  = fhp->fh_export;
	exp_get(exp);

	/* Lookup the name, but don't follow links */
	if (isdotent(name, len)) {
		if (len==1)
			dentry = dget(dparent);
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		else if (dparent != exp->ex_path.dentry)
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			dentry = dget_parent(dparent);
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		else if (!EX_NOHIDE(exp))
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			dentry = dget(dparent); /* .. == . just like at / */
		else {
			/* checking mountpoint crossing is very different when stepping up */
			struct svc_export *exp2 = NULL;
			struct dentry *dp;
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			struct vfsmount *mnt = mntget(exp->ex_path.mnt);
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			dentry = dget(dparent);
			while(dentry == mnt->mnt_root && follow_up(&mnt, &dentry))
				;
			dp = dget_parent(dentry);
			dput(dentry);
			dentry = dp;

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			exp2 = rqst_exp_parent(rqstp, mnt, dentry);
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			if (PTR_ERR(exp2) == -ENOENT) {
				dput(dentry);
				dentry = dget(dparent);
			} else if (IS_ERR(exp2)) {
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				host_err = PTR_ERR(exp2);
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				dput(dentry);
				mntput(mnt);
				goto out_nfserr;
			} else {
				exp_put(exp);
				exp = exp2;
			}
			mntput(mnt);
		}
	} else {
		fh_lock(fhp);
		dentry = lookup_one_len(name, dparent, len);
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		host_err = PTR_ERR(dentry);
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		if (IS_ERR(dentry))
			goto out_nfserr;
		/*
		 * check if we have crossed a mount point ...
		 */
		if (d_mountpoint(dentry)) {
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			if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) {
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				dput(dentry);
				goto out_nfserr;
			}
		}
	}
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	*dentry_ret = dentry;
	*exp_ret = exp;
	return 0;

out_nfserr:
	exp_put(exp);
	return nfserrno(host_err);
}

/*
 * Look up one component of a pathname.
 * N.B. After this call _both_ fhp and resfh need an fh_put
 *
 * If the lookup would cross a mountpoint, and the mounted filesystem
 * is exported to the client with NFSEXP_NOHIDE, then the lookup is
 * accepted as it stands and the mounted directory is
 * returned. Otherwise the covered directory is returned.
 * NOTE: this mountpoint crossing is not supported properly by all
 *   clients and is explicitly disallowed for NFSv3
 *      NeilBrown <neilb@cse.unsw.edu.au>
 */
__be32
nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name,
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				unsigned int len, struct svc_fh *resfh)
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{
	struct svc_export	*exp;
	struct dentry		*dentry;
	__be32 err;

	err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry);
	if (err)
		return err;
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	err = check_nfsd_access(exp, rqstp);
	if (err)
		goto out;
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	/*
	 * Note: we compose the file handle now, but as the
	 * dentry may be negative, it may need to be updated.
	 */
	err = fh_compose(resfh, exp, dentry, fhp);
	if (!err && !dentry->d_inode)
		err = nfserr_noent;
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out:
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	dput(dentry);
	exp_put(exp);
	return err;
}

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/*
 * Set various file attributes.
 * N.B. After this call fhp needs an fh_put
 */
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__be32
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nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap,
	     int check_guard, time_t guardtime)
{
	struct dentry	*dentry;
	struct inode	*inode;
	int		accmode = MAY_SATTR;
	int		ftype = 0;
	int		imode;
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	__be32		err;
	int		host_err;
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	int		size_change = 0;

	if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE))
		accmode |= MAY_WRITE|MAY_OWNER_OVERRIDE;
	if (iap->ia_valid & ATTR_SIZE)
		ftype = S_IFREG;

	/* Get inode */
	err = fh_verify(rqstp, fhp, ftype, accmode);
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	if (err)
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		goto out;

	dentry = fhp->fh_dentry;
	inode = dentry->d_inode;

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	/* Ignore any mode updates on symlinks */
	if (S_ISLNK(inode->i_mode))
		iap->ia_valid &= ~ATTR_MODE;

	if (!iap->ia_valid)
		goto out;

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	/*
	 * NFSv2 does not differentiate between "set-[ac]time-to-now"
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	 * which only requires access, and "set-[ac]time-to-X" which
	 * requires ownership.
	 * So if it looks like it might be "set both to the same time which
	 * is close to now", and if inode_change_ok fails, then we
	 * convert to "set to now" instead of "set to explicit time"
	 *
	 * We only call inode_change_ok as the last test as technically
	 * it is not an interface that we should be using.  It is only
	 * valid if the filesystem does not define it's own i_op->setattr.
	 */
#define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
#define	MAX_TOUCH_TIME_ERROR (30*60)
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	if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET &&
	    iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) {
		/*
		 * Looks probable.
		 *
		 * Now just make sure time is in the right ballpark.
		 * Solaris, at least, doesn't seem to care what the time
		 * request is.  We require it be within 30 minutes of now.
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		 */
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		time_t delta = iap->ia_atime.tv_sec - get_seconds();
		if (delta < 0)
			delta = -delta;
		if (delta < MAX_TOUCH_TIME_ERROR &&
		    inode_change_ok(inode, iap) != 0) {
			/*
			 * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME.
			 * This will cause notify_change to set these times
			 * to "now"
			 */
			iap->ia_valid &= ~BOTH_TIME_SET;
		}
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	}
	    
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	/*
	 * The size case is special.
	 * It changes the file as well as the attributes.
	 */
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	if (iap->ia_valid & ATTR_SIZE) {
		if (iap->ia_size < inode->i_size) {
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			err = nfsd_permission(rqstp, fhp->fh_export, dentry, MAY_TRUNC|MAY_OWNER_OVERRIDE);
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			if (err)
				goto out;
		}

		/*
		 * If we are changing the size of the file, then
		 * we need to break all leases.
		 */
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		host_err = break_lease(inode, FMODE_WRITE | O_NONBLOCK);
		if (host_err == -EWOULDBLOCK)
			host_err = -ETIMEDOUT;
		if (host_err) /* ENOMEM or EWOULDBLOCK */
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			goto out_nfserr;

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		host_err = get_write_access(inode);
		if (host_err)
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			goto out_nfserr;

		size_change = 1;
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		host_err = locks_verify_truncate(inode, NULL, iap->ia_size);
		if (host_err) {
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			put_write_access(inode);
			goto out_nfserr;
		}
		DQUOT_INIT(inode);
	}

	imode = inode->i_mode;
	if (iap->ia_valid & ATTR_MODE) {
		iap->ia_mode &= S_IALLUGO;
		imode = iap->ia_mode |= (imode & ~S_IALLUGO);
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		/* if changing uid/gid revoke setuid/setgid in mode */
		if ((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) {
			iap->ia_valid |= ATTR_KILL_PRIV;
			iap->ia_mode &= ~S_ISUID;
		}
		if ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid)
			iap->ia_mode &= ~S_ISGID;
	} else {
		/*
		 * Revoke setuid/setgid bit on chown/chgrp
		 */
		if ((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid)
			iap->ia_valid |= ATTR_KILL_SUID | ATTR_KILL_PRIV;
		if ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid)
			iap->ia_valid |= ATTR_KILL_SGID;
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	}

	/* Change the attributes. */

	iap->ia_valid |= ATTR_CTIME;

	err = nfserr_notsync;
	if (!check_guard || guardtime == inode->i_ctime.tv_sec) {
		fh_lock(fhp);
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		host_err = notify_change(dentry, iap);
		err = nfserrno(host_err);
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		fh_unlock(fhp);
	}
	if (size_change)
		put_write_access(inode);
	if (!err)
		if (EX_ISSYNC(fhp->fh_export))
			write_inode_now(inode, 1);
out:
	return err;

out_nfserr:
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	err = nfserrno(host_err);
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	goto out;
}

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#if defined(CONFIG_NFSD_V2_ACL) || \
    defined(CONFIG_NFSD_V3_ACL) || \
    defined(CONFIG_NFSD_V4)
static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf)
{
	ssize_t buflen;

	buflen = vfs_getxattr(dentry, key, NULL, 0);
	if (buflen <= 0)
		return buflen;
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	*buf = kmalloc(buflen, GFP_KERNEL);
	if (!*buf)
		return -ENOMEM;

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	return vfs_getxattr(dentry, key, *buf, buflen);
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}
#endif

#if defined(CONFIG_NFSD_V4)
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static int
set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key)
{
	int len;
	size_t buflen;
	char *buf = NULL;
	int error = 0;

	buflen = posix_acl_xattr_size(pacl->a_count);
	buf = kmalloc(buflen, GFP_KERNEL);
	error = -ENOMEM;
	if (buf == NULL)
		goto out;

	len = posix_acl_to_xattr(pacl, buf, buflen);
	if (len < 0) {
		error = len;
		goto out;
	}

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	error = vfs_setxattr(dentry, key, buf, len, 0);
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out:
	kfree(buf);
	return error;
}

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__be32
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nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
    struct nfs4_acl *acl)
{
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	__be32 error;
	int host_error;
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	struct dentry *dentry;
	struct inode *inode;
	struct posix_acl *pacl = NULL, *dpacl = NULL;
	unsigned int flags = 0;

	/* Get inode */
	error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, MAY_SATTR);
	if (error)
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		return error;
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	dentry = fhp->fh_dentry;
	inode = dentry->d_inode;
	if (S_ISDIR(inode->i_mode))
		flags = NFS4_ACL_DIR;

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	host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags);
	if (host_error == -EINVAL) {
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		return nfserr_attrnotsupp;
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	} else if (host_error < 0)
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		goto out_nfserr;

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	host_error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS);
	if (host_error < 0)
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		goto out_release;
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	if (S_ISDIR(inode->i_mode))
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		host_error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT);
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out_release:
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	posix_acl_release(pacl);
	posix_acl_release(dpacl);
out_nfserr:
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	if (host_error == -EOPNOTSUPP)
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		return nfserr_attrnotsupp;
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	else
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		return nfserrno(host_error);
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}

static struct posix_acl *
_get_posix_acl(struct dentry *dentry, char *key)
{
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	void *buf = NULL;
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	struct posix_acl *pacl = NULL;
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	int buflen;
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	buflen = nfsd_getxattr(dentry, key, &buf);
	if (!buflen)
		buflen = -ENODATA;
	if (buflen <= 0)
		return ERR_PTR(buflen);
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	pacl = posix_acl_from_xattr(buf, buflen);
	kfree(buf);
	return pacl;
}

int
nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl)
{
	struct inode *inode = dentry->d_inode;
	int error = 0;
	struct posix_acl *pacl = NULL, *dpacl = NULL;
	unsigned int flags = 0;

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	pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS);
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	if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA)
		pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
	if (IS_ERR(pacl)) {
		error = PTR_ERR(pacl);
		pacl = NULL;
		goto out;
	}

	if (S_ISDIR(inode->i_mode)) {
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		dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT);
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		if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA)
			dpacl = NULL;
		else if (IS_ERR(dpacl)) {
			error = PTR_ERR(dpacl);
			dpacl = NULL;
			goto out;
		}
		flags = NFS4_ACL_DIR;
	}

	*acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags);
	if (IS_ERR(*acl)) {
		error = PTR_ERR(*acl);
		*acl = NULL;
	}
 out:
	posix_acl_release(pacl);
	posix_acl_release(dpacl);
	return error;
}

#endif /* defined(CONFIG_NFS_V4) */

#ifdef CONFIG_NFSD_V3
/*
 * Check server access rights to a file system object
 */
struct accessmap {
	u32		access;
	int		how;
};
static struct accessmap	nfs3_regaccess[] = {
    {	NFS3_ACCESS_READ,	MAY_READ			},
    {	NFS3_ACCESS_EXECUTE,	MAY_EXEC			},
    {	NFS3_ACCESS_MODIFY,	MAY_WRITE|MAY_TRUNC		},
    {	NFS3_ACCESS_EXTEND,	MAY_WRITE			},

    {	0,			0				}
};

static struct accessmap	nfs3_diraccess[] = {
    {	NFS3_ACCESS_READ,	MAY_READ			},
    {	NFS3_ACCESS_LOOKUP,	MAY_EXEC			},
    {	NFS3_ACCESS_MODIFY,	MAY_EXEC|MAY_WRITE|MAY_TRUNC	},
    {	NFS3_ACCESS_EXTEND,	MAY_EXEC|MAY_WRITE		},
    {	NFS3_ACCESS_DELETE,	MAY_REMOVE			},

    {	0,			0				}
};

static struct accessmap	nfs3_anyaccess[] = {
	/* Some clients - Solaris 2.6 at least, make an access call
	 * to the server to check for access for things like /dev/null
	 * (which really, the server doesn't care about).  So
	 * We provide simple access checking for them, looking
	 * mainly at mode bits, and we make sure to ignore read-only
	 * filesystem checks
	 */
    {	NFS3_ACCESS_READ,	MAY_READ			},
    {	NFS3_ACCESS_EXECUTE,	MAY_EXEC			},
    {	NFS3_ACCESS_MODIFY,	MAY_WRITE|MAY_LOCAL_ACCESS	},
    {	NFS3_ACCESS_EXTEND,	MAY_WRITE|MAY_LOCAL_ACCESS	},

    {	0,			0				}
};

601
__be32
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nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported)
{
	struct accessmap	*map;
	struct svc_export	*export;
	struct dentry		*dentry;
	u32			query, result = 0, sresult = 0;
608
	__be32			error;
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	error = fh_verify(rqstp, fhp, 0, MAY_NOP);
	if (error)
		goto out;

	export = fhp->fh_export;
	dentry = fhp->fh_dentry;

	if (S_ISREG(dentry->d_inode->i_mode))
		map = nfs3_regaccess;
	else if (S_ISDIR(dentry->d_inode->i_mode))
		map = nfs3_diraccess;
	else
		map = nfs3_anyaccess;


	query = *access;
	for  (; map->access; map++) {
		if (map->access & query) {
628
			__be32 err2;
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			sresult |= map->access;

632
			err2 = nfsd_permission(rqstp, export, dentry, map->how);
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			switch (err2) {
			case nfs_ok:
				result |= map->access;
				break;
				
			/* the following error codes just mean the access was not allowed,
			 * rather than an error occurred */
			case nfserr_rofs:
			case nfserr_acces:
			case nfserr_perm:
				/* simply don't "or" in the access bit. */
				break;
			default:
				error = err2;
				goto out;
			}
		}
	}
	*access = result;
	if (supported)
		*supported = sresult;

 out:
	return error;
}
#endif /* CONFIG_NFSD_V3 */



/*
 * Open an existing file or directory.
 * The access argument indicates the type of open (read/write/lock)
 * N.B. After this call fhp needs an fh_put
 */
667
__be32
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nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
			int access, struct file **filp)
{
	struct dentry	*dentry;
	struct inode	*inode;
673 674 675
	int		flags = O_RDONLY|O_LARGEFILE;
	__be32		err;
	int		host_err;
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	/*
	 * If we get here, then the client has already done an "open",
	 * and (hopefully) checked permission - so allow OWNER_OVERRIDE
	 * in case a chmod has now revoked permission.
	 */
	err = fh_verify(rqstp, fhp, type, access | MAY_OWNER_OVERRIDE);
	if (err)
		goto out;

	dentry = fhp->fh_dentry;
	inode = dentry->d_inode;

	/* Disallow write access to files with the append-only bit set
	 * or any access when mandatory locking enabled
	 */
	err = nfserr_perm;
	if (IS_APPEND(inode) && (access & MAY_WRITE))
		goto out;
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	/*
	 * We must ignore files (but only files) which might have mandatory
	 * locks on them because there is no way to know if the accesser has
	 * the lock.
	 */
	if (S_ISREG((inode)->i_mode) && mandatory_lock(inode))
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		goto out;

	if (!inode->i_fop)
		goto out;

	/*
	 * Check to see if there are any leases on this file.
	 * This may block while leases are broken.
	 */
710 711 712 713
	host_err = break_lease(inode, O_NONBLOCK | ((access & MAY_WRITE) ? FMODE_WRITE : 0));
	if (host_err == -EWOULDBLOCK)
		host_err = -ETIMEDOUT;
	if (host_err) /* NOMEM or WOULDBLOCK */
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		goto out_nfserr;

	if (access & MAY_WRITE) {
717 718 719 720
		if (access & MAY_READ)
			flags = O_RDWR|O_LARGEFILE;
		else
			flags = O_WRONLY|O_LARGEFILE;
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		DQUOT_INIT(inode);
	}
724 725
	*filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_path.mnt),
				flags);
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	if (IS_ERR(*filp))
727
		host_err = PTR_ERR(*filp);
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out_nfserr:
729
	err = nfserrno(host_err);
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out:
	return err;
}

/*
 * Close a file.
 */
void
nfsd_close(struct file *filp)
{
	fput(filp);
}

/*
 * Sync a file
 * As this calls fsync (not fdatasync) there is no need for a write_inode
 * after it.
 */
748
static inline int nfsd_dosync(struct file *filp, struct dentry *dp,
749
			      const struct file_operations *fop)
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{
	struct inode *inode = dp->d_inode;
	int (*fsync) (struct file *, struct dentry *, int);
753
	int err;
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755 756 757 758 759
	err = filemap_fdatawrite(inode->i_mapping);
	if (err == 0 && fop && (fsync = fop->fsync))
		err = fsync(filp, dp, 0);
	if (err == 0)
		err = filemap_fdatawait(inode->i_mapping);
760

761
	return err;
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}
	

765
static int
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nfsd_sync(struct file *filp)
{
768
        int err;
769 770
	struct inode *inode = filp->f_path.dentry->d_inode;
	dprintk("nfsd: sync file %s\n", filp->f_path.dentry->d_name.name);
771
	mutex_lock(&inode->i_mutex);
772
	err=nfsd_dosync(filp, filp->f_path.dentry, filp->f_op);
773
	mutex_unlock(&inode->i_mutex);
774 775

	return err;
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}

778
int
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nfsd_sync_dir(struct dentry *dp)
{
781
	return nfsd_dosync(NULL, dp, dp->d_inode->i_fop);
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}

/*
 * Obtain the readahead parameters for the file
 * specified by (dev, ino).
 */

static inline struct raparms *
nfsd_get_raparms(dev_t dev, ino_t ino)
{
	struct raparms	*ra, **rap, **frap = NULL;
	int depth = 0;
794 795 796 797 798
	unsigned int hash;
	struct raparm_hbucket *rab;

	hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK;
	rab = &raparm_hash[hash];
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800 801
	spin_lock(&rab->pb_lock);
	for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) {
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		if (ra->p_ino == ino && ra->p_dev == dev)
			goto found;
		depth++;
		if (ra->p_count == 0)
			frap = rap;
	}
	depth = nfsdstats.ra_size*11/10;
	if (!frap) {	
810
		spin_unlock(&rab->pb_lock);
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		return NULL;
	}
	rap = frap;
	ra = *frap;
	ra->p_dev = dev;
	ra->p_ino = ino;
	ra->p_set = 0;
818
	ra->p_hindex = hash;
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found:
820
	if (rap != &rab->pb_head) {
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		*rap = ra->p_next;
822 823
		ra->p_next   = rab->pb_head;
		rab->pb_head = ra;
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	}
	ra->p_count++;
	nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++;
827
	spin_unlock(&rab->pb_lock);
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	return ra;
}

/*
832 833 834
 * Grab and keep cached pages associated with a file in the svc_rqst
 * so that they can be passed to the network sendmsg/sendpage routines
 * directly. They will be released after the sending has completed.
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 */
static int
837 838
nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
		  struct splice_desc *sd)
L
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{
840
	struct svc_rqst *rqstp = sd->u.data;
841
	struct page **pp = rqstp->rq_respages + rqstp->rq_resused;
842 843 844
	struct page *page = buf->page;
	size_t size;
	int ret;
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846
	ret = buf->ops->confirm(pipe, buf);
847 848 849 850
	if (unlikely(ret))
		return ret;

	size = sd->len;
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	if (rqstp->rq_res.page_len == 0) {
		get_page(page);
854 855 856
		put_page(*pp);
		*pp = page;
		rqstp->rq_resused++;
857
		rqstp->rq_res.page_base = buf->offset;
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		rqstp->rq_res.page_len = size;
859
	} else if (page != pp[-1]) {
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		get_page(page);
861 862
		if (*pp)
			put_page(*pp);
863 864
		*pp = page;
		rqstp->rq_resused++;
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		rqstp->rq_res.page_len += size;
866
	} else
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		rqstp->rq_res.page_len += size;

	return size;
}

872 873 874 875 876 877
static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe,
				    struct splice_desc *sd)
{
	return __splice_from_pipe(pipe, sd, nfsd_splice_actor);
}

878 879 880 881 882 883 884 885 886
static inline int svc_msnfs(struct svc_fh *ffhp)
{
#ifdef MSNFS
	return (ffhp->fh_export->ex_flags & NFSEXP_MSNFS);
#else
	return 0;
#endif
}

887
static __be32
L
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nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
              loff_t offset, struct kvec *vec, int vlen, unsigned long *count)
{
	struct inode *inode;
	struct raparms	*ra;
	mm_segment_t	oldfs;
894 895
	__be32		err;
	int		host_err;
L
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	err = nfserr_perm;
898
	inode = file->f_path.dentry->d_inode;
899 900

	if (svc_msnfs(fhp) && !lock_may_read(inode, offset, *count))
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		goto out;

	/* Get readahead parameters */
	ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino);

	if (ra && ra->p_set)
		file->f_ra = ra->p_ra;

909 910 911 912 913 914 915 916
	if (file->f_op->splice_read && rqstp->rq_splice_ok) {
		struct splice_desc sd = {
			.len		= 0,
			.total_len	= *count,
			.pos		= offset,
			.u.data		= rqstp,
		};

917
		rqstp->rq_resused = 1;
918
		host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor);
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	} else {
		oldfs = get_fs();
		set_fs(KERNEL_DS);
922
		host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset);
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		set_fs(oldfs);
	}

	/* Write back readahead params */
	if (ra) {
928 929
		struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex];
		spin_lock(&rab->pb_lock);
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		ra->p_ra = file->f_ra;
		ra->p_set = 1;
		ra->p_count--;
933
		spin_unlock(&rab->pb_lock);
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	}

936 937 938
	if (host_err >= 0) {
		nfsdstats.io_read += host_err;
		*count = host_err;
L
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939
		err = 0;
940
		fsnotify_access(file->f_path.dentry);
L
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941
	} else 
942
		err = nfserrno(host_err);
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out:
	return err;
}

947 948 949
static void kill_suid(struct dentry *dentry)
{
	struct iattr	ia;
950
	ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV;
951

952
	mutex_lock(&dentry->d_inode->i_mutex);
953
	notify_change(dentry, &ia);
954
	mutex_unlock(&dentry->d_inode->i_mutex);
955 956
}

957
static __be32
L
Linus Torvalds 已提交
958 959 960 961 962 963 964 965
nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
				loff_t offset, struct kvec *vec, int vlen,
	   			unsigned long cnt, int *stablep)
{
	struct svc_export	*exp;
	struct dentry		*dentry;
	struct inode		*inode;
	mm_segment_t		oldfs;
966 967
	__be32			err = 0;
	int			host_err;
L
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968 969
	int			stable = *stablep;

970
#ifdef MSNFS
L
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971 972 973
	err = nfserr_perm;

	if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
974
		(!lock_may_write(file->f_path.dentry->d_inode, offset, cnt)))
L
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975 976 977
		goto out;
#endif

978
	dentry = file->f_path.dentry;
L
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979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002
	inode = dentry->d_inode;
	exp   = fhp->fh_export;

	/*
	 * Request sync writes if
	 *  -	the sync export option has been set, or
	 *  -	the client requested O_SYNC behavior (NFSv3 feature).
	 *  -   The file system doesn't support fsync().
	 * When gathered writes have been configured for this volume,
	 * flushing the data to disk is handled separately below.
	 */

	if (file->f_op->fsync == 0) {/* COMMIT3 cannot work */
	       stable = 2;
	       *stablep = 2; /* FILE_SYNC */
	}

	if (!EX_ISSYNC(exp))
		stable = 0;
	if (stable && !EX_WGATHER(exp))
		file->f_flags |= O_SYNC;

	/* Write the data. */
	oldfs = get_fs(); set_fs(KERNEL_DS);
1003
	host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset);
L
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1004
	set_fs(oldfs);
1005
	if (host_err >= 0) {
L
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1006
		nfsdstats.io_write += cnt;
1007
		fsnotify_modify(file->f_path.dentry);
L
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1008 1009 1010
	}

	/* clear setuid/setgid flag after write */
1011
	if (host_err >= 0 && (inode->i_mode & (S_ISUID | S_ISGID)))
1012
		kill_suid(dentry);
L
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1013

1014
	if (host_err >= 0 && stable) {
L
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1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032
		static ino_t	last_ino;
		static dev_t	last_dev;

		/*
		 * Gathered writes: If another process is currently
		 * writing to the file, there's a high chance
		 * this is another nfsd (triggered by a bulk write
		 * from a client's biod). Rather than syncing the
		 * file with each write request, we sleep for 10 msec.
		 *
		 * I don't know if this roughly approximates
		 * C. Juszak's idea of gathered writes, but it's a
		 * nice and simple solution (IMHO), and it seems to
		 * work:-)
		 */
		if (EX_WGATHER(exp)) {
			if (atomic_read(&inode->i_writecount) > 1
			    || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) {
1033
				dprintk("nfsd: write defer %d\n", task_pid_nr(current));
L
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1034
				msleep(10);
1035
				dprintk("nfsd: write resume %d\n", task_pid_nr(current));
L
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1036 1037 1038
			}

			if (inode->i_state & I_DIRTY) {
1039
				dprintk("nfsd: write sync %d\n", task_pid_nr(current));
1040
				host_err=nfsd_sync(file);
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1041 1042 1043 1044 1045 1046 1047 1048 1049
			}
#if 0
			wake_up(&inode->i_wait);
#endif
		}
		last_ino = inode->i_ino;
		last_dev = inode->i_sb->s_dev;
	}

1050 1051
	dprintk("nfsd: write complete host_err=%d\n", host_err);
	if (host_err >= 0)
L
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1052 1053
		err = 0;
	else 
1054
		err = nfserrno(host_err);
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out:
	return err;
}

/*
 * Read data from a file. count must contain the requested read count
 * on entry. On return, *count contains the number of bytes actually read.
 * N.B. After this call fhp needs an fh_put
 */
1064
__be32
L
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1065 1066 1067 1068
nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
		loff_t offset, struct kvec *vec, int vlen,
		unsigned long *count)
{
1069
	__be32		err;
L
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1070 1071

	if (file) {
1072
		err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
L
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1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092
				MAY_READ|MAY_OWNER_OVERRIDE);
		if (err)
			goto out;
		err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count);
	} else {
		err = nfsd_open(rqstp, fhp, S_IFREG, MAY_READ, &file);
		if (err)
			goto out;
		err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count);
		nfsd_close(file);
	}
out:
	return err;
}

/*
 * Write data to a file.
 * The stable flag requests synchronous writes.
 * N.B. After this call fhp needs an fh_put
 */
1093
__be32
L
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nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
		loff_t offset, struct kvec *vec, int vlen, unsigned long cnt,
		int *stablep)
{
1098
	__be32			err = 0;
L
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1099 1100

	if (file) {
1101
		err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
L
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1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129
				MAY_WRITE|MAY_OWNER_OVERRIDE);
		if (err)
			goto out;
		err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt,
				stablep);
	} else {
		err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file);
		if (err)
			goto out;

		if (cnt)
			err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen,
					     cnt, stablep);
		nfsd_close(file);
	}
out:
	return err;
}

#ifdef CONFIG_NFSD_V3
/*
 * Commit all pending writes to stable storage.
 * Strictly speaking, we could sync just the indicated file region here,
 * but there's currently no way we can ask the VFS to do so.
 *
 * Unfortunately we cannot lock the file to make sure we return full WCC
 * data to the client, as locking happens lower down in the filesystem.
 */
1130
__be32
L
Linus Torvalds 已提交
1131 1132 1133 1134
nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp,
               loff_t offset, unsigned long count)
{
	struct file	*file;
1135
	__be32		err;
L
Linus Torvalds 已提交
1136 1137 1138 1139 1140 1141 1142 1143

	if ((u64)count > ~(u64)offset)
		return nfserr_inval;

	if ((err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file)) != 0)
		return err;
	if (EX_ISSYNC(fhp->fh_export)) {
		if (file->f_op && file->f_op->fsync) {
1144
			err = nfserrno(nfsd_sync(file));
L
Linus Torvalds 已提交
1145 1146 1147 1148 1149 1150 1151 1152 1153 1154
		} else {
			err = nfserr_notsupp;
		}
	}

	nfsd_close(file);
	return err;
}
#endif /* CONFIG_NFSD_V3 */

1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174
__be32
nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp,
			struct iattr *iap)
{
	/*
	 * Mode has already been set earlier in create:
	 */
	iap->ia_valid &= ~ATTR_MODE;
	/*
	 * Setting uid/gid works only for root.  Irix appears to
	 * send along the gid on create when it tries to implement
	 * setgid directories via NFS:
	 */
	if (current->fsuid != 0)
		iap->ia_valid &= ~(ATTR_UID|ATTR_GID);
	if (iap->ia_valid)
		return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0);
	return 0;
}

L
Linus Torvalds 已提交
1175 1176 1177 1178 1179 1180 1181 1182
/*
 * Create a file (regular, directory, device, fifo); UNIX sockets 
 * not yet implemented.
 * If the response fh has been verified, the parent directory should
 * already be locked. Note that the parent directory is left locked.
 *
 * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp
 */
1183
__be32
L
Linus Torvalds 已提交
1184 1185 1186 1187 1188 1189
nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
		char *fname, int flen, struct iattr *iap,
		int type, dev_t rdev, struct svc_fh *resfhp)
{
	struct dentry	*dentry, *dchild = NULL;
	struct inode	*dirp;
1190
	__be32		err;
1191
	__be32		err2;
1192
	int		host_err;
L
Linus Torvalds 已提交
1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216

	err = nfserr_perm;
	if (!flen)
		goto out;
	err = nfserr_exist;
	if (isdotent(fname, flen))
		goto out;

	err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE);
	if (err)
		goto out;

	dentry = fhp->fh_dentry;
	dirp = dentry->d_inode;

	err = nfserr_notdir;
	if(!dirp->i_op || !dirp->i_op->lookup)
		goto out;
	/*
	 * Check whether the response file handle has been verified yet.
	 * If it has, the parent directory should already be locked.
	 */
	if (!resfhp->fh_dentry) {
		/* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */
P
Peter Zijlstra 已提交
1217
		fh_lock_nested(fhp, I_MUTEX_PARENT);
L
Linus Torvalds 已提交
1218
		dchild = lookup_one_len(fname, dentry, flen);
1219
		host_err = PTR_ERR(dchild);
L
Linus Torvalds 已提交
1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233
		if (IS_ERR(dchild))
			goto out_nfserr;
		err = fh_compose(resfhp, fhp->fh_export, dchild, fhp);
		if (err)
			goto out;
	} else {
		/* called from nfsd_proc_create */
		dchild = dget(resfhp->fh_dentry);
		if (!fhp->fh_locked) {
			/* not actually possible */
			printk(KERN_ERR
				"nfsd_create: parent %s/%s not locked!\n",
				dentry->d_parent->d_name.name,
				dentry->d_name.name);
A
Al Viro 已提交
1234
			err = nfserr_io;
L
Linus Torvalds 已提交
1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254
			goto out;
		}
	}
	/*
	 * Make sure the child dentry is still negative ...
	 */
	err = nfserr_exist;
	if (dchild->d_inode) {
		dprintk("nfsd_create: dentry %s/%s not negative!\n",
			dentry->d_name.name, dchild->d_name.name);
		goto out; 
	}

	if (!(iap->ia_valid & ATTR_MODE))
		iap->ia_mode = 0;
	iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type;

	/*
	 * Get the dir op function pointer.
	 */
1255
	err = 0;
L
Linus Torvalds 已提交
1256 1257
	switch (type) {
	case S_IFREG:
1258 1259 1260
		host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
		if (host_err)
			goto out_nfserr;
1261
		host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
L
Linus Torvalds 已提交
1262 1263
		break;
	case S_IFDIR:
1264 1265 1266
		host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
		if (host_err)
			goto out_nfserr;
1267
		host_err = vfs_mkdir(dirp, dchild, iap->ia_mode);
L
Linus Torvalds 已提交
1268 1269 1270 1271 1272
		break;
	case S_IFCHR:
	case S_IFBLK:
	case S_IFIFO:
	case S_IFSOCK:
1273 1274 1275
		host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
		if (host_err)
			goto out_nfserr;
1276
		host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev);
L
Linus Torvalds 已提交
1277 1278 1279
		break;
	default:
	        printk("nfsd: bad file type %o in nfsd_create\n", type);
1280
		host_err = -EINVAL;
1281
		goto out_nfserr;
L
Linus Torvalds 已提交
1282
	}
1283 1284
	if (host_err < 0) {
		mnt_drop_write(fhp->fh_export->ex_path.mnt);
L
Linus Torvalds 已提交
1285
		goto out_nfserr;
1286
	}
L
Linus Torvalds 已提交
1287 1288

	if (EX_ISSYNC(fhp->fh_export)) {
1289
		err = nfserrno(nfsd_sync_dir(dentry));
L
Linus Torvalds 已提交
1290 1291 1292 1293
		write_inode_now(dchild->d_inode, 1);
	}


1294 1295 1296
	err2 = nfsd_create_setattr(rqstp, resfhp, iap);
	if (err2)
		err = err2;
1297
	mnt_drop_write(fhp->fh_export->ex_path.mnt);
L
Linus Torvalds 已提交
1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308
	/*
	 * Update the file handle to get the new inode info.
	 */
	if (!err)
		err = fh_update(resfhp);
out:
	if (dchild && !IS_ERR(dchild))
		dput(dchild);
	return err;

out_nfserr:
1309
	err = nfserrno(host_err);
L
Linus Torvalds 已提交
1310 1311 1312 1313 1314 1315 1316
	goto out;
}

#ifdef CONFIG_NFSD_V3
/*
 * NFSv3 version of nfsd_create
 */
1317
__be32
L
Linus Torvalds 已提交
1318 1319 1320
nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp,
		char *fname, int flen, struct iattr *iap,
		struct svc_fh *resfhp, int createmode, u32 *verifier,
1321
	        int *truncp, int *created)
L
Linus Torvalds 已提交
1322 1323 1324
{
	struct dentry	*dentry, *dchild = NULL;
	struct inode	*dirp;
1325
	__be32		err;
1326
	__be32		err2;
1327
	int		host_err;
L
Linus Torvalds 已提交
1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349
	__u32		v_mtime=0, v_atime=0;

	err = nfserr_perm;
	if (!flen)
		goto out;
	err = nfserr_exist;
	if (isdotent(fname, flen))
		goto out;
	if (!(iap->ia_valid & ATTR_MODE))
		iap->ia_mode = 0;
	err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE);
	if (err)
		goto out;

	dentry = fhp->fh_dentry;
	dirp = dentry->d_inode;

	/* Get all the sanity checks out of the way before
	 * we lock the parent. */
	err = nfserr_notdir;
	if(!dirp->i_op || !dirp->i_op->lookup)
		goto out;
P
Peter Zijlstra 已提交
1350
	fh_lock_nested(fhp, I_MUTEX_PARENT);
L
Linus Torvalds 已提交
1351 1352 1353 1354 1355

	/*
	 * Compose the response file handle.
	 */
	dchild = lookup_one_len(fname, dentry, flen);
1356
	host_err = PTR_ERR(dchild);
L
Linus Torvalds 已提交
1357 1358 1359 1360 1361 1362 1363 1364
	if (IS_ERR(dchild))
		goto out_nfserr;

	err = fh_compose(resfhp, fhp->fh_export, dchild, fhp);
	if (err)
		goto out;

	if (createmode == NFS3_CREATE_EXCLUSIVE) {
1365
		/* solaris7 gets confused (bugid 4218508) if these have
1366 1367 1368 1369
		 * the high bit set, so just clear the high bits. If this is
		 * ever changed to use different attrs for storing the
		 * verifier, then do_open_lookup() will also need to be fixed
		 * accordingly.
L
Linus Torvalds 已提交
1370 1371 1372 1373 1374
		 */
		v_mtime = verifier[0]&0x7fffffff;
		v_atime = verifier[1]&0x7fffffff;
	}
	
1375 1376 1377
	host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
	if (host_err)
		goto out_nfserr;
L
Linus Torvalds 已提交
1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408
	if (dchild->d_inode) {
		err = 0;

		switch (createmode) {
		case NFS3_CREATE_UNCHECKED:
			if (! S_ISREG(dchild->d_inode->i_mode))
				err = nfserr_exist;
			else if (truncp) {
				/* in nfsv4, we need to treat this case a little
				 * differently.  we don't want to truncate the
				 * file now; this would be wrong if the OPEN
				 * fails for some other reason.  furthermore,
				 * if the size is nonzero, we should ignore it
				 * according to spec!
				 */
				*truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size;
			}
			else {
				iap->ia_valid &= ATTR_SIZE;
				goto set_attr;
			}
			break;
		case NFS3_CREATE_EXCLUSIVE:
			if (   dchild->d_inode->i_mtime.tv_sec == v_mtime
			    && dchild->d_inode->i_atime.tv_sec == v_atime
			    && dchild->d_inode->i_size  == 0 )
				break;
			 /* fallthru */
		case NFS3_CREATE_GUARDED:
			err = nfserr_exist;
		}
1409
		mnt_drop_write(fhp->fh_export->ex_path.mnt);
L
Linus Torvalds 已提交
1410 1411 1412
		goto out;
	}

1413
	host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
1414 1415
	if (host_err < 0) {
		mnt_drop_write(fhp->fh_export->ex_path.mnt);
L
Linus Torvalds 已提交
1416
		goto out_nfserr;
1417
	}
1418 1419
	if (created)
		*created = 1;
L
Linus Torvalds 已提交
1420 1421

	if (EX_ISSYNC(fhp->fh_export)) {
1422
		err = nfserrno(nfsd_sync_dir(dentry));
L
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1423 1424 1425 1426
		/* setattr will sync the child (or not) */
	}

	if (createmode == NFS3_CREATE_EXCLUSIVE) {
1427
		/* Cram the verifier into atime/mtime */
L
Linus Torvalds 已提交
1428
		iap->ia_valid = ATTR_MTIME|ATTR_ATIME
1429
			| ATTR_MTIME_SET|ATTR_ATIME_SET;
L
Linus Torvalds 已提交
1430 1431 1432 1433 1434 1435 1436 1437
		/* XXX someone who knows this better please fix it for nsec */ 
		iap->ia_mtime.tv_sec = v_mtime;
		iap->ia_atime.tv_sec = v_atime;
		iap->ia_mtime.tv_nsec = 0;
		iap->ia_atime.tv_nsec = 0;
	}

 set_attr:
1438 1439 1440
	err2 = nfsd_create_setattr(rqstp, resfhp, iap);
	if (err2)
		err = err2;
1441

1442
	mnt_drop_write(fhp->fh_export->ex_path.mnt);
1443 1444 1445 1446 1447
	/*
	 * Update the filehandle to get the new inode info.
	 */
	if (!err)
		err = fh_update(resfhp);
L
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1448 1449 1450 1451 1452 1453 1454 1455

 out:
	fh_unlock(fhp);
	if (dchild && !IS_ERR(dchild))
		dput(dchild);
 	return err;
 
 out_nfserr:
1456
	err = nfserrno(host_err);
L
Linus Torvalds 已提交
1457 1458 1459 1460 1461 1462 1463 1464 1465
	goto out;
}
#endif /* CONFIG_NFSD_V3 */

/*
 * Read a symlink. On entry, *lenp must contain the maximum path length that
 * fits into the buffer. On return, it contains the true length.
 * N.B. After this call fhp needs an fh_put
 */
1466
__be32
L
Linus Torvalds 已提交
1467 1468 1469 1470 1471
nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp)
{
	struct dentry	*dentry;
	struct inode	*inode;
	mm_segment_t	oldfs;
1472 1473
	__be32		err;
	int		host_err;
L
Linus Torvalds 已提交
1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485

	err = fh_verify(rqstp, fhp, S_IFLNK, MAY_NOP);
	if (err)
		goto out;

	dentry = fhp->fh_dentry;
	inode = dentry->d_inode;

	err = nfserr_inval;
	if (!inode->i_op || !inode->i_op->readlink)
		goto out;

1486
	touch_atime(fhp->fh_export->ex_path.mnt, dentry);
L
Linus Torvalds 已提交
1487 1488 1489 1490 1491
	/* N.B. Why does this call need a get_fs()??
	 * Remove the set_fs and watch the fireworks:-) --okir
	 */

	oldfs = get_fs(); set_fs(KERNEL_DS);
1492
	host_err = inode->i_op->readlink(dentry, buf, *lenp);
L
Linus Torvalds 已提交
1493 1494
	set_fs(oldfs);

1495
	if (host_err < 0)
L
Linus Torvalds 已提交
1496
		goto out_nfserr;
1497
	*lenp = host_err;
L
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1498 1499 1500 1501 1502
	err = 0;
out:
	return err;

out_nfserr:
1503
	err = nfserrno(host_err);
L
Linus Torvalds 已提交
1504 1505 1506 1507 1508 1509 1510
	goto out;
}

/*
 * Create a symlink and look up its inode
 * N.B. After this call _both_ fhp and resfhp need an fh_put
 */
1511
__be32
L
Linus Torvalds 已提交
1512 1513 1514 1515 1516 1517 1518
nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp,
				char *fname, int flen,
				char *path,  int plen,
				struct svc_fh *resfhp,
				struct iattr *iap)
{
	struct dentry	*dentry, *dnew;
1519 1520
	__be32		err, cerr;
	int		host_err;
L
Linus Torvalds 已提交
1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535
	umode_t		mode;

	err = nfserr_noent;
	if (!flen || !plen)
		goto out;
	err = nfserr_exist;
	if (isdotent(fname, flen))
		goto out;

	err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE);
	if (err)
		goto out;
	fh_lock(fhp);
	dentry = fhp->fh_dentry;
	dnew = lookup_one_len(fname, dentry, flen);
1536
	host_err = PTR_ERR(dnew);
L
Linus Torvalds 已提交
1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547
	if (IS_ERR(dnew))
		goto out_nfserr;

	mode = S_IALLUGO;
	/* Only the MODE ATTRibute is even vaguely meaningful */
	if (iap && (iap->ia_valid & ATTR_MODE))
		mode = iap->ia_mode & S_IALLUGO;

	if (unlikely(path[plen] != 0)) {
		char *path_alloced = kmalloc(plen+1, GFP_KERNEL);
		if (path_alloced == NULL)
1548
			host_err = -ENOMEM;
L
Linus Torvalds 已提交
1549 1550 1551
		else {
			strncpy(path_alloced, path, plen);
			path_alloced[plen] = 0;
1552
			host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced, mode);
L
Linus Torvalds 已提交
1553 1554 1555
			kfree(path_alloced);
		}
	} else
1556
		host_err = vfs_symlink(dentry->d_inode, dnew, path, mode);
L
Linus Torvalds 已提交
1557

1558
	if (!host_err) {
L
Linus Torvalds 已提交
1559
		if (EX_ISSYNC(fhp->fh_export))
1560 1561 1562
			host_err = nfsd_sync_dir(dentry);
	}
	err = nfserrno(host_err);
L
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1563 1564 1565 1566 1567 1568 1569 1570 1571
	fh_unlock(fhp);

	cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp);
	dput(dnew);
	if (err==0) err = cerr;
out:
	return err;

out_nfserr:
1572
	err = nfserrno(host_err);
L
Linus Torvalds 已提交
1573 1574 1575 1576 1577 1578 1579
	goto out;
}

/*
 * Create a hardlink
 * N.B. After this call _both_ ffhp and tfhp need an fh_put
 */
1580
__be32
L
Linus Torvalds 已提交
1581 1582 1583 1584 1585
nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp,
				char *name, int len, struct svc_fh *tfhp)
{
	struct dentry	*ddir, *dnew, *dold;
	struct inode	*dirp, *dest;
1586 1587
	__be32		err;
	int		host_err;
L
Linus Torvalds 已提交
1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602

	err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_CREATE);
	if (err)
		goto out;
	err = fh_verify(rqstp, tfhp, -S_IFDIR, MAY_NOP);
	if (err)
		goto out;

	err = nfserr_perm;
	if (!len)
		goto out;
	err = nfserr_exist;
	if (isdotent(name, len))
		goto out;

P
Peter Zijlstra 已提交
1603
	fh_lock_nested(ffhp, I_MUTEX_PARENT);
L
Linus Torvalds 已提交
1604 1605 1606 1607
	ddir = ffhp->fh_dentry;
	dirp = ddir->d_inode;

	dnew = lookup_one_len(name, ddir, len);
1608
	host_err = PTR_ERR(dnew);
L
Linus Torvalds 已提交
1609 1610 1611 1612 1613 1614
	if (IS_ERR(dnew))
		goto out_nfserr;

	dold = tfhp->fh_dentry;
	dest = dold->d_inode;

1615 1616
	host_err = vfs_link(dold, dirp, dnew);
	if (!host_err) {
L
Linus Torvalds 已提交
1617
		if (EX_ISSYNC(ffhp->fh_export)) {
1618
			err = nfserrno(nfsd_sync_dir(ddir));
L
Linus Torvalds 已提交
1619 1620
			write_inode_now(dest, 1);
		}
1621
		err = 0;
L
Linus Torvalds 已提交
1622
	} else {
1623
		if (host_err == -EXDEV && rqstp->rq_vers == 2)
L
Linus Torvalds 已提交
1624 1625
			err = nfserr_acces;
		else
1626
			err = nfserrno(host_err);
L
Linus Torvalds 已提交
1627 1628 1629
	}

	dput(dnew);
1630 1631
out_unlock:
	fh_unlock(ffhp);
L
Linus Torvalds 已提交
1632 1633 1634 1635
out:
	return err;

out_nfserr:
1636
	err = nfserrno(host_err);
1637
	goto out_unlock;
L
Linus Torvalds 已提交
1638 1639 1640 1641 1642 1643
}

/*
 * Rename a file
 * N.B. After this call _both_ ffhp and tfhp need an fh_put
 */
1644
__be32
L
Linus Torvalds 已提交
1645 1646 1647 1648 1649
nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen,
			    struct svc_fh *tfhp, char *tname, int tlen)
{
	struct dentry	*fdentry, *tdentry, *odentry, *ndentry, *trap;
	struct inode	*fdir, *tdir;
1650 1651
	__be32		err;
	int		host_err;
L
Linus Torvalds 已提交
1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666

	err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_REMOVE);
	if (err)
		goto out;
	err = fh_verify(rqstp, tfhp, S_IFDIR, MAY_CREATE);
	if (err)
		goto out;

	fdentry = ffhp->fh_dentry;
	fdir = fdentry->d_inode;

	tdentry = tfhp->fh_dentry;
	tdir = tdentry->d_inode;

	err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev;
1667
	if (ffhp->fh_export != tfhp->fh_export)
L
Linus Torvalds 已提交
1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681
		goto out;

	err = nfserr_perm;
	if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen))
		goto out;

	/* cannot use fh_lock as we need deadlock protective ordering
	 * so do it by hand */
	trap = lock_rename(tdentry, fdentry);
	ffhp->fh_locked = tfhp->fh_locked = 1;
	fill_pre_wcc(ffhp);
	fill_pre_wcc(tfhp);

	odentry = lookup_one_len(fname, fdentry, flen);
1682
	host_err = PTR_ERR(odentry);
L
Linus Torvalds 已提交
1683 1684 1685
	if (IS_ERR(odentry))
		goto out_nfserr;

1686
	host_err = -ENOENT;
L
Linus Torvalds 已提交
1687 1688
	if (!odentry->d_inode)
		goto out_dput_old;
1689
	host_err = -EINVAL;
L
Linus Torvalds 已提交
1690 1691 1692 1693
	if (odentry == trap)
		goto out_dput_old;

	ndentry = lookup_one_len(tname, tdentry, tlen);
1694
	host_err = PTR_ERR(ndentry);
L
Linus Torvalds 已提交
1695 1696
	if (IS_ERR(ndentry))
		goto out_dput_old;
1697
	host_err = -ENOTEMPTY;
L
Linus Torvalds 已提交
1698 1699 1700 1701 1702 1703 1704
	if (ndentry == trap)
		goto out_dput_new;

#ifdef MSNFS
	if ((ffhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
		((atomic_read(&odentry->d_count) > 1)
		 || (atomic_read(&ndentry->d_count) > 1))) {
1705
			host_err = -EPERM;
L
Linus Torvalds 已提交
1706 1707
	} else
#endif
1708 1709 1710 1711 1712
	host_err = vfs_rename(fdir, odentry, tdir, ndentry);
	if (!host_err && EX_ISSYNC(tfhp->fh_export)) {
		host_err = nfsd_sync_dir(tdentry);
		if (!host_err)
			host_err = nfsd_sync_dir(fdentry);
L
Linus Torvalds 已提交
1713 1714 1715 1716 1717 1718 1719
	}

 out_dput_new:
	dput(ndentry);
 out_dput_old:
	dput(odentry);
 out_nfserr:
1720
	err = nfserrno(host_err);
L
Linus Torvalds 已提交
1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738

	/* we cannot reply on fh_unlock on the two filehandles,
	 * as that would do the wrong thing if the two directories
	 * were the same, so again we do it by hand
	 */
	fill_post_wcc(ffhp);
	fill_post_wcc(tfhp);
	unlock_rename(tdentry, fdentry);
	ffhp->fh_locked = tfhp->fh_locked = 0;

out:
	return err;
}

/*
 * Unlink a file or directory
 * N.B. After this call fhp needs an fh_put
 */
1739
__be32
L
Linus Torvalds 已提交
1740 1741 1742 1743 1744
nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
				char *fname, int flen)
{
	struct dentry	*dentry, *rdentry;
	struct inode	*dirp;
1745 1746
	__be32		err;
	int		host_err;
L
Linus Torvalds 已提交
1747 1748 1749 1750 1751 1752 1753 1754

	err = nfserr_acces;
	if (!flen || isdotent(fname, flen))
		goto out;
	err = fh_verify(rqstp, fhp, S_IFDIR, MAY_REMOVE);
	if (err)
		goto out;

P
Peter Zijlstra 已提交
1755
	fh_lock_nested(fhp, I_MUTEX_PARENT);
L
Linus Torvalds 已提交
1756 1757 1758 1759
	dentry = fhp->fh_dentry;
	dirp = dentry->d_inode;

	rdentry = lookup_one_len(fname, dentry, flen);
1760
	host_err = PTR_ERR(rdentry);
L
Linus Torvalds 已提交
1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772
	if (IS_ERR(rdentry))
		goto out_nfserr;

	if (!rdentry->d_inode) {
		dput(rdentry);
		err = nfserr_noent;
		goto out;
	}

	if (!type)
		type = rdentry->d_inode->i_mode & S_IFMT;

1773 1774 1775 1776
	host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
	if (host_err)
		goto out_nfserr;

L
Linus Torvalds 已提交
1777 1778 1779 1780
	if (type != S_IFDIR) { /* It's UNLINK */
#ifdef MSNFS
		if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
			(atomic_read(&rdentry->d_count) > 1)) {
1781
			host_err = -EPERM;
L
Linus Torvalds 已提交
1782 1783
		} else
#endif
1784
		host_err = vfs_unlink(dirp, rdentry);
L
Linus Torvalds 已提交
1785
	} else { /* It's RMDIR */
1786
		host_err = vfs_rmdir(dirp, rdentry);
L
Linus Torvalds 已提交
1787 1788 1789 1790
	}

	dput(rdentry);

1791
	if (host_err)
1792
		goto out_drop;
1793 1794
	if (EX_ISSYNC(fhp->fh_export))
		host_err = nfsd_sync_dir(dentry);
L
Linus Torvalds 已提交
1795

1796 1797
out_drop:
	mnt_drop_write(fhp->fh_export->ex_path.mnt);
L
Linus Torvalds 已提交
1798
out_nfserr:
1799
	err = nfserrno(host_err);
1800 1801
out:
	return err;
L
Linus Torvalds 已提交
1802 1803 1804 1805 1806 1807
}

/*
 * Read entries from a directory.
 * The  NFSv3/4 verifier we ignore for now.
 */
1808
__be32
L
Linus Torvalds 已提交
1809
nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, 
1810
	     struct readdir_cd *cdp, filldir_t func)
L
Linus Torvalds 已提交
1811
{
1812 1813
	__be32		err;
	int 		host_err;
L
Linus Torvalds 已提交
1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834
	struct file	*file;
	loff_t		offset = *offsetp;

	err = nfsd_open(rqstp, fhp, S_IFDIR, MAY_READ, &file);
	if (err)
		goto out;

	offset = vfs_llseek(file, offset, 0);
	if (offset < 0) {
		err = nfserrno((int)offset);
		goto out_close;
	}

	/*
	 * Read the directory entries. This silly loop is necessary because
	 * readdir() is not guaranteed to fill up the entire buffer, but
	 * may choose to do less.
	 */

	do {
		cdp->err = nfserr_eof; /* will be cleared on successful read */
1835
		host_err = vfs_readdir(file, func, cdp);
1836 1837 1838
	} while (host_err >=0 && cdp->err == nfs_ok);
	if (host_err)
		err = nfserrno(host_err);
L
Linus Torvalds 已提交
1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854
	else
		err = cdp->err;
	*offsetp = vfs_llseek(file, 0, 1);

	if (err == nfserr_eof || err == nfserr_toosmall)
		err = nfs_ok; /* can still be found in ->err */
out_close:
	nfsd_close(file);
out:
	return err;
}

/*
 * Get file system stats
 * N.B. After this call fhp needs an fh_put
 */
1855
__be32
L
Linus Torvalds 已提交
1856 1857
nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat)
{
1858
	__be32 err = fh_verify(rqstp, fhp, 0, MAY_NOP);
1859
	if (!err && vfs_statfs(fhp->fh_dentry,stat))
L
Linus Torvalds 已提交
1860 1861 1862 1863
		err = nfserr_io;
	return err;
}

J
J. Bruce Fields 已提交
1864
static int exp_rdonly(struct svc_rqst *rqstp, struct svc_export *exp)
1865
{
J
J. Bruce Fields 已提交
1866
	return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY;
1867 1868
}

L
Linus Torvalds 已提交
1869 1870 1871
/*
 * Check for a user's access permissions to this inode.
 */
1872
__be32
1873 1874
nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp,
					struct dentry *dentry, int acc)
L
Linus Torvalds 已提交
1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904
{
	struct inode	*inode = dentry->d_inode;
	int		err;

	if (acc == MAY_NOP)
		return 0;
#if 0
	dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n",
		acc,
		(acc & MAY_READ)?	" read"  : "",
		(acc & MAY_WRITE)?	" write" : "",
		(acc & MAY_EXEC)?	" exec"  : "",
		(acc & MAY_SATTR)?	" sattr" : "",
		(acc & MAY_TRUNC)?	" trunc" : "",
		(acc & MAY_LOCK)?	" lock"  : "",
		(acc & MAY_OWNER_OVERRIDE)? " owneroverride" : "",
		inode->i_mode,
		IS_IMMUTABLE(inode)?	" immut" : "",
		IS_APPEND(inode)?	" append" : "",
		IS_RDONLY(inode)?	" ro" : "");
	dprintk("      owner %d/%d user %d/%d\n",
		inode->i_uid, inode->i_gid, current->fsuid, current->fsgid);
#endif

	/* Normally we reject any write/sattr etc access on a read-only file
	 * system.  But if it is IRIX doing check on write-access for a 
	 * device special file, we ignore rofs.
	 */
	if (!(acc & MAY_LOCAL_ACCESS))
		if (acc & (MAY_WRITE | MAY_SATTR | MAY_TRUNC)) {
J
J. Bruce Fields 已提交
1905
			if (exp_rdonly(rqstp, exp) || IS_RDONLY(inode))
L
Linus Torvalds 已提交
1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953
				return nfserr_rofs;
			if (/* (acc & MAY_WRITE) && */ IS_IMMUTABLE(inode))
				return nfserr_perm;
		}
	if ((acc & MAY_TRUNC) && IS_APPEND(inode))
		return nfserr_perm;

	if (acc & MAY_LOCK) {
		/* If we cannot rely on authentication in NLM requests,
		 * just allow locks, otherwise require read permission, or
		 * ownership
		 */
		if (exp->ex_flags & NFSEXP_NOAUTHNLM)
			return 0;
		else
			acc = MAY_READ | MAY_OWNER_OVERRIDE;
	}
	/*
	 * The file owner always gets access permission for accesses that
	 * would normally be checked at open time. This is to make
	 * file access work even when the client has done a fchmod(fd, 0).
	 *
	 * However, `cp foo bar' should fail nevertheless when bar is
	 * readonly. A sensible way to do this might be to reject all
	 * attempts to truncate a read-only file, because a creat() call
	 * always implies file truncation.
	 * ... but this isn't really fair.  A process may reasonably call
	 * ftruncate on an open file descriptor on a file with perm 000.
	 * We must trust the client to do permission checking - using "ACCESS"
	 * with NFSv3.
	 */
	if ((acc & MAY_OWNER_OVERRIDE) &&
	    inode->i_uid == current->fsuid)
		return 0;

	err = permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC), NULL);

	/* Allow read access to binaries even when mode 111 */
	if (err == -EACCES && S_ISREG(inode->i_mode) &&
	    acc == (MAY_READ | MAY_OWNER_OVERRIDE))
		err = permission(inode, MAY_EXEC, NULL);

	return err? nfserrno(err) : 0;
}

void
nfsd_racache_shutdown(void)
{
1954
	if (!raparml)
L
Linus Torvalds 已提交
1955 1956 1957
		return;
	dprintk("nfsd: freeing readahead buffers.\n");
	kfree(raparml);
1958
	raparml = NULL;
L
Linus Torvalds 已提交
1959 1960 1961 1962 1963 1964 1965 1966
}
/*
 * Initialize readahead param cache
 */
int
nfsd_racache_init(int cache_size)
{
	int	i;
1967 1968
	int	j = 0;
	int	nperbucket;
L
Linus Torvalds 已提交
1969

1970 1971

	if (raparml)
L
Linus Torvalds 已提交
1972
		return 0;
1973 1974
	if (cache_size < 2*RAPARM_HASH_SIZE)
		cache_size = 2*RAPARM_HASH_SIZE;
1975 1976 1977
	raparml = kcalloc(cache_size, sizeof(struct raparms), GFP_KERNEL);

	if (!raparml) {
L
Linus Torvalds 已提交
1978
		printk(KERN_WARNING
1979
			"nfsd: Could not allocate memory read-ahead cache.\n");
L
Linus Torvalds 已提交
1980 1981
		return -ENOMEM;
	}
1982 1983 1984 1985 1986 1987

	dprintk("nfsd: allocating %d readahead buffers.\n", cache_size);
	for (i = 0 ; i < RAPARM_HASH_SIZE ; i++) {
		raparm_hash[i].pb_head = NULL;
		spin_lock_init(&raparm_hash[i].pb_lock);
	}
1988
	nperbucket = DIV_ROUND_UP(cache_size, RAPARM_HASH_SIZE);
1989 1990 1991 1992 1993 1994 1995
	for (i = 0; i < cache_size - 1; i++) {
		if (i % nperbucket == 0)
			raparm_hash[j++].pb_head = raparml + i;
		if (i % nperbucket < nperbucket-1)
			raparml[i].p_next = raparml + i + 1;
	}

L
Linus Torvalds 已提交
1996 1997 1998
	nfsdstats.ra_size = cache_size;
	return 0;
}
1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009

#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
struct posix_acl *
nfsd_get_posix_acl(struct svc_fh *fhp, int type)
{
	struct inode *inode = fhp->fh_dentry->d_inode;
	char *name;
	void *value = NULL;
	ssize_t size;
	struct posix_acl *acl;

2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020
	if (!IS_POSIXACL(inode))
		return ERR_PTR(-EOPNOTSUPP);

	switch (type) {
	case ACL_TYPE_ACCESS:
		name = POSIX_ACL_XATTR_ACCESS;
		break;
	case ACL_TYPE_DEFAULT:
		name = POSIX_ACL_XATTR_DEFAULT;
		break;
	default:
2021 2022 2023
		return ERR_PTR(-EOPNOTSUPP);
	}

2024 2025 2026
	size = nfsd_getxattr(fhp->fh_dentry, name, &value);
	if (size < 0)
		return ERR_PTR(size);
2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046

	acl = posix_acl_from_xattr(value, size);
	kfree(value);
	return acl;
}

int
nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl)
{
	struct inode *inode = fhp->fh_dentry->d_inode;
	char *name;
	void *value = NULL;
	size_t size;
	int error;

	if (!IS_POSIXACL(inode) || !inode->i_op ||
	    !inode->i_op->setxattr || !inode->i_op->removexattr)
		return -EOPNOTSUPP;
	switch(type) {
		case ACL_TYPE_ACCESS:
2047
			name = POSIX_ACL_XATTR_ACCESS;
2048 2049
			break;
		case ACL_TYPE_DEFAULT:
2050
			name = POSIX_ACL_XATTR_DEFAULT;
2051 2052 2053 2054 2055 2056
			break;
		default:
			return -EOPNOTSUPP;
	}

	if (acl && acl->a_count) {
2057
		size = posix_acl_xattr_size(acl->a_count);
2058 2059 2060
		value = kmalloc(size, GFP_KERNEL);
		if (!value)
			return -ENOMEM;
2061 2062
		error = posix_acl_to_xattr(acl, value, size);
		if (error < 0)
2063
			goto getout;
2064
		size = error;
2065 2066 2067 2068
	} else
		size = 0;

	if (size)
2069
		error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0);
2070 2071 2072 2073
	else {
		if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT)
			error = 0;
		else {
2074
			error = vfs_removexattr(fhp->fh_dentry, name);
2075 2076 2077 2078 2079 2080 2081 2082 2083 2084
			if (error == -ENODATA)
				error = 0;
		}
	}

getout:
	kfree(value);
	return error;
}
#endif  /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */