Release 4.10 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/fs.h>
#include <linux/file.h>
#include <linux/splice.h>
#include <linux/falloc.h>
#include <linux/fcntl.h>
#include <linux/namei.h>
#include <linux/delay.h>
#include <linux/fsnotify.h>
#include <linux/posix_acl_xattr.h>
#include <linux/xattr.h>
#include <linux/jhash.h>
#include <linux/ima.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/exportfs.h>
#include <linux/writeback.h>
#include <linux/security.h>

#ifdef CONFIG_NFSD_V3
#include "xdr3.h"
#endif /* CONFIG_NFSD_V3 */

#ifdef CONFIG_NFSD_V4
#include "../internal.h"
#include "acl.h"
#include "idmap.h"
#endif /* CONFIG_NFSD_V4 */

#include "nfsd.h"
#include "vfs.h"
#include "trace.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;
	
unsigned int		p_hindex;
};


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


#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];

/* 
 * Called from nfsd_lookup and encode_dirent. Check if we have crossed 
 * a mount point.
 * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged,
 *  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;
	struct path path = {.mnt = mntget(exp->ex_path.mnt),
			    .dentry = dget(dentry)};
	int err = 0;

	err = follow_down(&path);
	if (err < 0)
		goto out;

	exp2 = rqst_exp_get_by_name(rqstp, &path);
	if (IS_ERR(exp2)) {
		err = PTR_ERR(exp2);
		/*
                 * We normally allow NFS clients to continue
                 * "underneath" a mountpoint that is not exported.
                 * The exception is V4ROOT, where no traversal is ever
                 * allowed without an explicit export of the new
                 * directory.
                 */
		if (err == -ENOENT && !(exp->ex_flags & NFSEXP_V4ROOT))
			err = 0;
		path_put(&path);
		goto out;
	}
	if (nfsd_v4client(rqstp) ||
		(exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) {
		/* successfully crossed mount point */
		/*
                 * This is subtle: path.dentry is *not* on path.mnt
                 * at this point.  The only reason we are safe is that
                 * original mnt is pinned down by exp, so we should
                 * put path *before* putting exp
                 */
		*dpp = path.dentry;
		path.dentry = dentry;
		*expp = exp2;
		exp2 = exp;
	}
	path_put(&path);
	exp_put(exp2);
out:
	return err;
}

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j. bruce fields
20
9.57%
2
16.67%
david howells
david howells
11
5.26%
1
8.33%
steve dickson
steve dickson
5
2.39%
1
8.33%
jan blunck
jan blunck
3
1.44%
1
8.33%
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209
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12
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static void follow_to_parent(struct path *path)
{
	struct dentry *dp;

	while (path->dentry == path->mnt->mnt_root && follow_up(path))
		;
	dp = dget_parent(path->dentry);
	dput(path->dentry);
	path->dentry = dp;
}

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static int nfsd_lookup_parent(struct svc_rqst *rqstp, struct dentry *dparent, struct svc_export **exp, struct dentry **dentryp)
{
	struct svc_export *exp2;
	struct path path = {.mnt = mntget((*exp)->ex_path.mnt),
			    .dentry = dget(dparent)};

	follow_to_parent(&path);

	exp2 = rqst_exp_parent(rqstp, &path);
	if (PTR_ERR(exp2) == -ENOENT) {
		*dentryp = dget(dparent);
	} else if (IS_ERR(exp2)) {
		path_put(&path);
		return PTR_ERR(exp2);
	} else {
		*dentryp = dget(path.dentry);
		exp_put(*exp);
		*exp = exp2;
	}
	path_put(&path);
	return 0;
}

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/*
 * For nfsd purposes, we treat V4ROOT exports as though there was an
 * export at *every* directory.
 */


int nfsd_mountpoint(struct dentry *dentry, struct svc_export *exp)
{
	if (d_mountpoint(dentry))
		return 1;
	if (nfsd4_is_junction(dentry))
		return 1;
	if (!(exp->ex_flags & NFSEXP_V4ROOT))
		return 0;
	return d_inode(dentry) != NULL;
}

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1
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__be32

nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp,
		   const char *name, unsigned int len,
		   struct svc_export **exp_ret, struct dentry **dentry_ret)
{
	struct svc_export	*exp;
	struct dentry		*dparent;
	struct dentry		*dentry;
	int			host_err;

	dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name);

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

	/* Lookup the name, but don't follow links */
	if (isdotent(name, len)) {
		if (len==1)
			dentry = dget(dparent);
		else if (dparent != exp->ex_path.dentry)
			dentry = dget_parent(dparent);
		else if (!EX_NOHIDE(exp) && !nfsd_v4client(rqstp))
			dentry = dget(dparent); /* .. == . just like at / */
		else {
			/* checking mountpoint crossing is very different when stepping up */
			host_err = nfsd_lookup_parent(rqstp, dparent, &exp, &dentry);
			if (host_err)
				goto out_nfserr;
		}
	} else {
		/*
                 * In the nfsd4_open() case, this may be held across
                 * subsequent open and delegation acquisition which may
                 * need to take the child's i_mutex:
                 */
		fh_lock_nested(fhp, I_MUTEX_PARENT);
		dentry = lookup_one_len(name, dparent, len);
		host_err = PTR_ERR(dentry);
		if (IS_ERR(dentry))
			goto out_nfserr;
		if (nfsd_mountpoint(dentry, exp)) {
			/*
                         * We don't need the i_mutex after all.  It's
                         * still possible we could open this (regular
                         * files can be mountpoints too), but the
                         * i_mutex is just there to prevent renames of
                         * something that we might be about to delegate,
                         * and a mountpoint won't be renamed:
                         */
			fh_unlock(fhp);
			if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) {
				dput(dentry);
				goto out_nfserr;
			}
		}
	}
	*dentry_ret = dentry;
	*exp_ret = exp;
	return 0;

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

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j. bruce fields
64
22.54%
7
18.92%
neil brown
neil brown
33
11.62%
6
16.22%
al viro
al viro
17
5.99%
4
10.81%
linus torvalds
linus torvalds
14
4.93%
2
5.41%
andrew morton
andrew morton
3
1.06%
2
5.41%
jan blunck
jan blunck
3
1.06%
1
2.70%
kinglong mee
kinglong mee
2
0.70%
1
2.70%
chuck lever
chuck lever
1
0.35%
1
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284
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37
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/*
 * 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,
				unsigned int len, struct svc_fh *resfh)
{
	struct svc_export	*exp;
	struct dentry		*dentry;
	__be32 err;

	err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC);
	if (err)
		return err;
	err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry);
	if (err)
		return err;
	err = check_nfsd_access(exp, rqstp);
	if (err)
		goto out;
	/*
         * 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 && d_really_is_negative(dentry))
		err = nfserr_noent;
out:
	dput(dentry);
	exp_put(exp);
	return err;
}

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27
18.37%
6
42.86%
andy adamson
andy adamson
18
12.24%
1
7.14%
andrew morton
andrew morton
10
6.80%
2
14.29%
david howells
david howells
3
2.04%
1
7.14%
linus torvalds
linus torvalds
2
1.36%
1
7.14%
chuck lever
chuck lever
1
0.68%
1
7.14%
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147
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14
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/*
 * Commit metadata changes to stable storage.
 */

static int

commit_metadata(struct svc_fh *fhp)
{
	struct inode *inode = d_inode(fhp->fh_dentry);
	const struct export_operations *export_ops = inode->i_sb->s_export_op;

	if (!EX_ISSYNC(fhp->fh_export))
		return 0;

	if (export_ops->commit_metadata)
		return export_ops->commit_metadata(inode);
	return sync_inode_metadata(inode, 1);
}

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5
7.14%
1
33.33%
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david howells
3
4.29%
1
33.33%
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70
100.00%
3
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/*
 * Go over the attributes and take care of the small differences between
 * NFS semantics and what Linux expects.
 */

static void

nfsd_sanitize_attrs(struct inode *inode, struct iattr *iap)
{
	/* sanitize the mode change */
	if (iap->ia_valid & ATTR_MODE) {
		iap->ia_mode &= S_IALLUGO;
		iap->ia_mode |= (inode->i_mode & ~S_IALLUGO);
	}

	/* Revoke setuid/setgid on chown */
	if (!S_ISDIR(inode->i_mode) &&
	    ((iap->ia_valid & ATTR_UID) || (iap->ia_valid & ATTR_GID))) {
		iap->ia_valid |= ATTR_KILL_PRIV;
		if (iap->ia_valid & ATTR_MODE) {
			/* we're setting mode too, just clear the s*id bits */
			iap->ia_mode &= ~S_ISUID;
			if (iap->ia_mode & S_IXGRP)
				iap->ia_mode &= ~S_ISGID;
		} else {
			/* set ATTR_KILL_* bits and let VFS handle it */
			iap->ia_valid |= (ATTR_KILL_SUID | ATTR_KILL_SGID);
		}
	}
}

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jeff layton
56
43.08%
3
37.50%
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sachin prabhu
10
7.69%
1
12.50%
christoph hellwig
christoph hellwig
6
4.62%
1
12.50%
al viro
al viro
1
0.77%
1
12.50%
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130
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8
100.00%


static __be32

nfsd_get_write_access(struct svc_rqst *rqstp, struct svc_fh *fhp,
		struct iattr *iap)
{
	struct inode *inode = d_inode(fhp->fh_dentry);
	int host_err;

	if (iap->ia_size < inode->i_size) {
		__be32 err;

		err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
				NFSD_MAY_TRUNC | NFSD_MAY_OWNER_OVERRIDE);
		if (err)
			return err;
	}

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

	host_err = locks_verify_truncate(inode, NULL, iap->ia_size);
	if (host_err)
		goto out_put_write_access;
	return 0;

out_put_write_access:
	put_write_access(inode);
out_nfserrno:
	return nfserrno(host_err);
}

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/*
 * Set various file attributes.  After this call fhp needs an fh_put.
 */

__be32

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 = NFSD_MAY_SATTR;
	umode_t		ftype = 0;
	__be32		err;
	int		host_err;
	bool		get_write_count;
	int		size_change = 0;

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

	/* Callers that do fh_verify should do the fh_want_write: */
	get_write_count = !fhp->fh_dentry;

	/* Get inode */
	err = fh_verify(rqstp, fhp, ftype, accmode);
	if (err)
		goto out;
	if (get_write_count) {
		host_err = fh_want_write(fhp);
		if (host_err)
			return nfserrno(host_err);
	}

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

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

	if (!iap->ia_valid)
		goto out;

	nfsd_sanitize_attrs(inode, iap);

	/*
         * The size case is special, it changes the file in addition to the
         * attributes.
         */
	if (iap->ia_valid & ATTR_SIZE) {
		err = nfsd_get_write_access(rqstp, fhp, iap);
		if (err)
			goto out;
		size_change = 1;

		/*
                 * RFC5661, Section 18.30.4:
                 *   Changing the size of a file with SETATTR indirectly
                 *   changes the time_modify and change attributes.
                 *
                 * (and similar for the older RFCs)
                 */
		if (iap->ia_size != i_size_read(inode))
			iap->ia_valid |= ATTR_MTIME;
	}

	iap->ia_valid |= ATTR_CTIME;

	if (check_guard && guardtime != inode->i_ctime.tv_sec) {
		err = nfserr_notsync;
		goto out_put_write_access;
	}

	fh_lock(fhp);
	host_err = notify_change(dentry, iap, NULL);
	fh_unlock(fhp);
	err = nfserrno(host_err);

out_put_write_access:
	if (size_change)
		put_write_access(inode);
	if (!err)
		err = nfserrno(commit_metadata(fhp));
out:
	return err;
}

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christoph hellwig
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56.40%
5
29.41%
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j. bruce fields
113
34.45%
3
17.65%
pre-git
pre-git
17
5.18%
4
23.53%
al viro
al viro
8
2.44%
2
11.76%
david howells
david howells
3
0.91%
1
5.88%
linus torvalds
linus torvalds
1
0.30%
1
5.88%
trond myklebust
trond myklebust
1
0.30%
1
5.88%
Total
328
100.00%
17
100.00%

#if defined(CONFIG_NFSD_V4)
/*
 * NFS junction information is stored in an extended attribute.
 */

#define NFSD_JUNCTION_XATTR_NAME	XATTR_TRUSTED_PREFIX "junction.nfs"

/**
 * nfsd4_is_junction - Test if an object could be an NFS junction
 *
 * @dentry: object to test
 *
 * Returns 1 if "dentry" appears to contain NFS junction information.
 * Otherwise 0 is returned.
 */


int nfsd4_is_junction(struct dentry *dentry)
{
	struct inode *inode = d_inode(dentry);

	if (inode == NULL)
		return 0;
	if (inode->i_mode & S_IXUGO)
		return 0;
	if (!(inode->i_mode & S_ISVTX))
		return 0;
	if (vfs_getxattr(dentry, NFSD_JUNCTION_XATTR_NAME, NULL, 0) <= 0)
		return 0;
	return 1;
}
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christoph hellwig
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92.00%
2
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david howells
3
4.00%
1
25.00%
krishna kumar
krishna kumar
3
4.00%
1
25.00%
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75
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#ifdef CONFIG_NFSD_V4_SECURITY_LABEL


__be32 nfsd4_set_nfs4_label(struct svc_rqst *rqstp, struct svc_fh *fhp,
		struct xdr_netobj *label)
{
	__be32 error;
	int host_error;
	struct dentry *dentry;

	error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, NFSD_MAY_SATTR);
	if (error)
		return error;

	dentry = fhp->fh_dentry;

	inode_lock(d_inode(dentry));
	host_error = security_inode_setsecctx(dentry, label->data, label->len);
	inode_unlock(d_inode(dentry));
	return nfserrno(host_error);
}
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neil brown
41
43.16%
1
20.00%
david howells
david howells
6
6.32%
1
20.00%
al viro
al viro
2
2.11%
1
20.00%
eric w. biederman
eric w. biederman
1
1.05%
1
20.00%
Total
95
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5
100.00%

#else


__be32 nfsd4_set_nfs4_label(struct svc_rqst *rqstp, struct svc_fh *fhp,
		struct xdr_netobj *label)
{
	return nfserr_notsupp;
}
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30.43%
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al viro
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4.35%
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#endif



__be32 nfsd4_clone_file_range(struct file *src, u64 src_pos, struct file *dst,
		u64 dst_pos, u64 count)
{
	return nfserrno(do_clone_file_range(src, src_pos, dst, dst_pos, count));
}

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97.56%
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amir goldstein
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ssize_t nfsd_copy_file_range(struct file *src, u64 src_pos, struct file *dst,
			     u64 dst_pos, u64 count)
{

	/*
         * Limit copy to 4MB to prevent indefinitely blocking an nfsd
         * thread and client rpc slot.  The choice of 4MB is somewhat
         * arbitrary.  We might instead base this on r/wsize, or make it
         * tunable, or use a time instead of a byte limit, or implement
         * asynchronous copy.  In theory a client could also recognize a
         * limit like this and pipeline multiple COPY requests.
         */
	count = min_t(u64, count, 1 << 22);
	return vfs_copy_file_range(src, src_pos, dst, dst_pos, count, 0);
}

Contributors
Person
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anna schumaker
anna schumaker
54
100.00%
1
100.00%
Total
54
100.00%
1
100.00%



__be32 nfsd4_vfs_fallocate(struct svc_rqst *rqstp, struct svc_fh *fhp,
			   struct file *file, loff_t offset, loff_t len,
			   int flags)
{
	int error;

	if (!S_ISREG(file_inode(file)->i_mode))
		return nfserr_inval;

	error = vfs_fallocate(file, flags, offset, len);
	if (!error)
		error = commit_metadata(fhp);

	return nfserrno(error);
}
Contributors
Person
Tokens
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Commits
CommitProp
anna schumaker
anna schumaker
79
100.00%
1
100.00%
Total
79
100.00%
1
100.00%

#endif /* defined(CONFIG_NFSD_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,	NFSD_MAY_READ			},
    {	NFS3_ACCESS_EXECUTE,	NFSD_MAY_EXEC			},
    {	NFS3_ACCESS_MODIFY,	NFSD_MAY_WRITE|NFSD_MAY_TRUNC	},
    {	NFS3_ACCESS_EXTEND,	NFSD_MAY_WRITE			},

    {	0,			0				}
};


static struct accessmap	nfs3_diraccess[] = {
    {	NFS3_ACCESS_READ,	NFSD_MAY_READ			},
    {	NFS3_ACCESS_LOOKUP,	NFSD_MAY_EXEC			},
    {	NFS3_ACCESS_MODIFY,	NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC},
    {	NFS3_ACCESS_EXTEND,	NFSD_MAY_EXEC|NFSD_MAY_WRITE	},
    {	NFS3_ACCESS_DELETE,	NFSD_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,	NFSD_MAY_READ			},
    {	NFS3_ACCESS_EXECUTE,	NFSD_MAY_EXEC			},
    {	NFS3_ACCESS_MODIFY,	NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS	},
    {	NFS3_ACCESS_EXTEND,	NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS	},

    {	0,			0				}
};


__be32

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;
	__be32			error;

	error = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP);
	if (error)
		goto out;

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

	if (d_is_reg(dentry))
		map = nfs3_regaccess;
	else if (d_is_dir(dentry))
		map = nfs3_diraccess;
	else
		map = nfs3_anyaccess;


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

			sresult |= map->access;

			err2 = nfsd_permission(rqstp, export, dentry, map->how);
			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;
}
Contributors
Person
Tokens
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CommitProp
christoph hellwig
christoph hellwig
148
67.89%
1
20.00%
neil brown
neil brown
66
30.28%
2
40.00%
david howells
david howells
2
0.92%
1
20.00%
j. bruce fields
j. bruce fields
2
0.92%
1
20.00%
Total
218
100.00%
5
100.00%

#endif /* CONFIG_NFSD_V3 */



static int nfsd_open_break_lease(struct inode *inode, int access)
{
	unsigned int mode;

	if (access & NFSD_MAY_NOT_BREAK_LEASE)
		return 0;
	mode = (access & NFSD_MAY_WRITE) ? O_WRONLY : O_RDONLY;
	return break_lease(inode, mode | O_NONBLOCK);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph hellwig
christoph hellwig
32
65.31%
2
50.00%
neil brown
neil brown
16
32.65%
1
25.00%
eric w. biederman
eric w. biederman
1
2.04%
1
25.00%
Total
49
100.00%
4
100.00%

/*
 * Open an existing file or directory.
 * The may_flags argument indicates the type of open (read/write/lock)
 * and additional flags.
 * N.B. After this call fhp needs an fh_put
 */

__be32

nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type,
			int may_flags, struct file **filp)
{
	struct path	path;
	struct inode	*inode;
	struct file	*file;
	int		flags = O_RDONLY|O_LARGEFILE;
	__be32		err;
	int		host_err = 0;

	validate_process_creds();

	/*
         * 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.
         *
         * Arguably we should also allow the owner override for
         * directories, but we never have and it doesn't seem to have
         * caused anyone a problem.  If we were to change this, note
         * also that our filldir callbacks would need a variant of
         * lookup_one_len that doesn't check permissions.
         */
	if (type == S_IFREG)
		may_flags |= NFSD_MAY_OWNER_OVERRIDE;
	err = fh_verify(rqstp, fhp, type, may_flags);
	if (err)
		goto out;

	path.mnt = fhp->fh_export->ex_path.mnt;
	path.dentry = fhp->fh_dentry;
	inode = d_inode(path.dentry);

	/* 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) && (may_flags & NFSD_MAY_WRITE))
		goto out;
	/*
         * 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))
		goto out;

	if (!inode->i_fop)
		goto out;

	host_err = nfsd_open_break_lease(inode, may_flags);
	if (host_err) /* NOMEM or WOULDBLOCK */
		goto out_nfserr;

	if (may_flags & NFSD_MAY_WRITE) {
		if (may_flags & NFSD_MAY_READ)
			flags = O_RDWR|O_LARGEFILE;
		else
			flags = O_WRONLY|O_LARGEFILE;
	}

	file = dentry_open(&path, flags, current_cred());
	if (IS_ERR(file)) {
		host_err = PTR_ERR(file);
		goto out_nfserr;
	}

	host_err = ima_file_check(file, may_flags, 0);
	if (host_err) {
		fput(file);
		goto out_nfserr;
	}

	if (may_flags & NFSD_MAY_64BIT_COOKIE)
		file->f_mode |= FMODE_64BITHASH;
	else
		file->f_mode |= FMODE_32BITHASH;

	*filp = file;
out_nfserr:
	err = nfserrno(host_err);
out:
	validate_process_creds();
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph hellwig
christoph hellwig
177
56.73%
2
33.33%
neil brown
neil brown
98
31.41%
1
16.67%
kinglong mee
kinglong mee
32
10.26%
1
16.67%
david howells
david howells
3
0.96%
1
16.67%
dmitry kasatkin
dmitry kasatkin
2
0.64%
1
16.67%
Total
312
100.00%
6
100.00%


struct raparms *

nfsd_init_raparms(struct file *file)
{
	struct inode *inode = file_inode(file);
	dev_t dev = inode->i_sb->s_dev;
	ino_t ino = inode->i_ino;
	struct raparms	*ra, **rap, **frap = NULL;
	int depth = 0;
	unsigned int hash;
	struct raparm_hbucket *rab;

	hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK;
	rab = &raparm_hash[hash];

	spin_lock(&rab->pb_lock);
	for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) {
		if (ra->p_ino == ino && ra->p_dev == dev)
			goto found;
		depth++;
		if (ra->p_count == 0)
			frap = rap;
	}
	depth = nfsdstats.ra_size;
	if (!frap) {	
		spin_unlock(&rab->pb_lock);
		return NULL;
	}
	rap = frap;
	ra = *frap;
	ra->p_dev = dev;
	ra->p_ino = ino;
	ra->p_set = 0;
	ra->p_hindex = hash;
found:
	if (rap != &rab->pb_head) {
		*rap = ra->p_next;
		ra->p_next   = rab->pb_head;
		rab->pb_head = ra;
	}
	ra->p_count++;
	nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++;
	spin_unlock(&rab->pb_lock);

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

Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph hellwig
christoph hellwig
206
71.53%
2
40.00%
j. bruce fields
j. bruce fields
37
12.85%
1
20.00%
david quigley
david quigley
29
10.07%
1
20.00%
neil brown
neil brown
16
5.56%
1
20.00%
Total
288
100.00%
5
100.00%



void nfsd_put_raparams(struct file *file, struct raparms *ra)
{
	struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex];

	spin_lock(&rab->pb_lock);
	ra->p_ra = file->f_ra;
	ra->p_set = 1;
	ra->p_count--;
	spin_unlock(&rab->pb_lock);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph hellwig
christoph hellwig
63
100.00%
1
100.00%
Total
63
100.00%
1
100.00%

/*
 * 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.
 */

static int

nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
		  struct splice_desc *sd)
{
	struct svc_rqst *rqstp = sd->u.data;
	struct page **pp = rqstp->rq_next_page;
	struct page *page = buf->page;
	size_t size;

	size = sd->len;

	if (rqstp->rq_res.page_len == 0) {
		get_page(page);
		put_page(*rqstp->rq_next_page);
		*(rqstp->rq_next_page++) = page;
		rqstp->rq_res.page_base = buf->offset;
		rqstp->rq_res.page_len = size;
	} else if (page != pp[-1]) {
		get_page(page);
		if (*rqstp->rq_next_page)
			put_page(*rqstp->rq_next_page);
		*(rqstp->rq_next_page++) = page;
		rqstp->rq_res.page_len += size;
	} else
		rqstp->rq_res.page_len += size;

	return size;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph hellwig
christoph hellwig
142
80.68%
1
25.00%
neil brown
neil brown
32
18.18%
1
25.00%
david shaw
david shaw
1
0.57%
1
25.00%
j. bruce fields
j. bruce fields
1
0.57%
1
25.00%
Total
176
100.00%
4
100.00%



static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe,
				    struct splice_desc *sd)
{
	return __splice_from_pipe(pipe, sd, nfsd_splice_actor);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph hellwig
christoph hellwig
19
73.08%
1
25.00%
neil brown
neil brown
4
15.38%
1
25.00%
pre-git
pre-git
3
11.54%
2
50.00%
Total
26
100.00%
4
100.00%


static __be32

nfsd_finish_read(struct file *file, unsigned long *count, int host_err)
{
	if (host_err >= 0) {
		nfsdstats.io_read += host_err;
		*count = host_err;
		fsnotify_access(file);
		return 0;
	} else 
		return nfserrno(host_err);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
j. bruce fields
j. bruce fields
51
96.23%
1
33.33%
jeff layton
jeff layton
1
1.89%
1
33.33%
al viro
al viro
1
1.89%
1
33.33%
Total
53
100.00%
3
100.00%



__be32 nfsd_splice_read(struct svc_rqst *rqstp,
		     struct file *file, loff_t offset, unsigned long *count)
{
	struct splice_desc sd = {
		.len		= 0,
		.total_len	= *count,
		.pos		= offset,
		.u.data		= rqstp,
        };
	int host_err;

	rqstp->rq_next_page = rqstp->rq_respages + 1;
	host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor);
	return nfsd_finish_read(file, count, host_err);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph hellwig
christoph hellwig
45
51.72%
1
12.50%
pre-git
pre-git
19
21.84%
2
25.00%
j. bruce fields
j. bruce fields
15
17.24%
1
12.50%
trond myklebust
trond myklebust
5
5.75%
1
12.50%
andrew morton
andrew morton
1
1.15%
1
12.50%
jeff layton
jeff layton
1
1.15%
1
12.50%
miklos szeredi
miklos szeredi
1
1.15%
1
12.50%
Total
87
100.00%
8
100.00%



__be32 nfsd_readv(struct file *file, loff_t offset, struct kvec *vec, int vlen,
		unsigned long *count)
{
	mm_segment_t oldfs;
	int host_err;

	oldfs = get_fs();
	set_fs(KERNEL_DS);
	host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset, 0);
	set_fs(oldfs);
	return nfsd_finish_read(file, count, host_err);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
j. bruce fields
j. bruce fields
39
49.37%
1
12.50%
christoph hellwig
christoph hellwig
32
40.51%
3
37.50%
pre-git
pre-git
5
6.33%
2
25.00%
trond myklebust
trond myklebust
2
2.53%
1
12.50%
jeff layton
jeff layton
1
1.27%
1
12.50%
Total
79
100.00%
8
100.00%


static __be32

nfsd_vfs_read(struct svc_rqst *rqstp, struct file *file,
	      loff_t offset, struct kvec *vec, int vlen, unsigned long *count)
{
	if (file->f_op->splice_read && test_bit(RQ_SPLICE_OK, &rqstp->rq_flags))
		return nfsd_splice_read(rqstp, file, offset, count);
	else
		return nfsd_readv(file, offset, vec, vlen, count);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
j. bruce fields
j. bruce fields
59
76.62%
1
16.67%
jeff layton
jeff layton
7
9.09%
1
16.67%
pre-git
pre-git
6
7.79%
1
16.67%
christoph hellwig
christoph hellwig
3
3.90%
1
16.67%
yamamoto takashi
yamamoto takashi
1
1.30%
1
16.67%
neil brown
neil brown
1
1.30%
1
16.67%
Total
77
100.00%
6
100.00%

/*
 * 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:-)
 *
 * Note: we do this only in the NFSv2 case, since v3 and higher have a
 * better tool (separate unstable writes and commits) for solving this
 * problem.
 */


static int wait_for_concurrent_writes(struct file *file)
{
	struct inode *inode = file_inode(file);
	static ino_t last_ino;
	static dev_t last_dev;
	int err = 0;

	if (atomic_read(&inode->i_writecount) > 1
	    || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) {
		dprintk("nfsd: write defer %d\n", task_pid_nr(current));
		msleep(10);
		dprintk("nfsd: write resume %d\n", task_pid_nr(current));
	}

	if (inode->i_state & I_DIRTY) {
		dprintk("nfsd: write sync %d\n", task_pid_nr(current));
		err = vfs_fsync(file, 0);
	}
	last_ino = inode->i_ino;
	last_dev = inode->i_sb->s_dev;
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph hellwig
christoph hellwig
121
89.63%
1
50.00%
wengang wang
wengang wang
14
10.37%
1
50.00%
Total
135
100.00%
2
100.00%


__be32

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 inode		*inode;
	mm_segment_t		oldfs;
	__be32			err = 0;
	int			host_err;
	int			stable = *stablep;
	int			use_wgather;
	loff_t			pos = offset;
	unsigned int		pflags = current->flags;
	int			flags = 0;

	if (test_bit(RQ_LOCAL, &rqstp->rq_flags))
		/*
                 * We want less throttling in balance_dirty_pages()
                 * and shrink_inactive_list() so that nfs to
                 * localhost doesn't cause nfsd to lock up due to all
                 * the client's dirty pages or its congested queue.
                 */
		current->flags |= PF_LESS_THROTTLE;

	inode = file_inode(file);
	exp   = fhp->fh_export;

	use_wgather = (rqstp->rq_vers == 2) && EX_WGATHER(exp);

	if (!EX_ISSYNC(exp))
		stable = 0;

	if (stable && !use_wgather)
		flags |= RWF_SYNC;

	/* Write the data. */
	oldfs = get_fs(); set_fs(KERNEL_DS);
	host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &pos, flags);
	set_fs(oldfs);
	if (host_err < 0)
		goto out_nfserr;
	*cnt = host_err;
	nfsdstats.io_write += host_err;
	fsnotify_modify(file);

	if (stable && use_wgather)
		host_err = wait_for_concurrent_writes(file);

out_nfserr:
	dprintk("nfsd: write complete host_err=%d\n", host_err);
	if (host_err >= 0)
		err = 0;
	else
		err = nfserrno(host_err);
	if (test_bit(RQ_LOCAL, &rqstp->rq_flags))
		tsk_restore_flags(current, pflags, PF_LESS_THROTTLE);
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph hellwig
christoph hellwig
148
51.93%
3
14.29%
pre-git
pre-git
59
20.70%
8
38.10%
neil brown
neil brown
34
11.93%
1
4.76%
jeff layton
jeff layton
14
4.91%
1
4.76%
al viro
al viro
8
2.81%
2
9.52%
jan kara
jan kara
8
2.81%
1
4.76%
miklos szeredi
miklos szeredi
8
2.81%
1
4.76%
j. bruce fields
j. bruce fields
2
0.70%
1
4.76%
andrew morton
andrew morton
2
0.70%
1
4.76%
dave hansen
dave hansen
1
0.35%
1
4.76%
linus torvalds
linus torvalds
1
0.35%
1
4.76%
Total
285
100.00%
21
100.00%

/*
 * 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
 */


__be32 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp,
	loff_t offset, struct kvec *vec, int vlen, unsigned long *count)
{
	struct file *file;
	struct raparms	*ra;
	__be32 err;

	trace_read_start(rqstp, fhp, offset, vlen);
	err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
	if (err)
		return err;

	ra = nfsd_init_raparms(file);

	trace_read_opened(rqstp, fhp, offset, vlen);
	err = nfsd_vfs_read(rqstp, file, offset, vec, vlen, count);
	trace_read_io_done(rqstp, fhp, offset, vlen);

	if (ra)
		nfsd_put_raparams(file, ra);
	fput(file);

	trace_read_done(rqstp, fhp, offset, vlen);

	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
j. bruce fields
j. bruce fields
84
54.55%
1
20.00%
jeff layton
jeff layton
44
28.57%
1
20.00%
christoph hellwig
christoph hellwig
25
16.23%
2
40.00%
mi jinlong
mi jinlong
1
0.65%
1
20.00%
Total
154
100.00%
5
100.00%

/*
 * Write data to a file.
 * The stable flag requests synchronous writes.
 * N.B. After this call fhp needs an fh_put
 */

__be32

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)
{
	__be32			err = 0;

	trace_write_start(rqstp, fhp, offset, vlen);

	if (file) {
		err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
				NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE);
		if (err)
			goto out;
		trace_write_opened(rqstp, fhp, offset, vlen);
		err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt,
				stablep);
		trace_write_io_done(rqstp, fhp, offset, vlen);
	} else {
		err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file);
		if (err)
			goto out;

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

Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph hellwig
christoph hellwig
110
48.89%
2
25.00%
jeff layton
jeff layton
66
29.33%
1
12.50%
pre-git
pre-git
26
11.56%
2
25.00%
sachin prabhu
sachin prabhu
19
8.44%
1
12.50%
linus torvalds
linus torvalds
2
0.89%
1
12.50%
kendrick m. smith
kendrick m. smith
2
0.89%
1
12.50%
Total
225
100.00%
8
100.00%

#ifdef CONFIG_NFSD_V3
/*
 * Commit all pending writes to stable storage.
 *
 * Note: we only guarantee that data that lies within the range specified
 * by the 'offset' and 'count' parameters will be synced.
 *
 * 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.
 */

__be32

nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp,
               loff_t offset, unsigned long count)
{
	struct file	*file;
	loff_t		end = LLONG_MAX;
	__be32		err = nfserr_inval;

	if (offset < 0)
		goto out;
	if (count != 0) {
		end = offset + (loff_t)count - 1;
		if (end < offset)
			goto out;
	}

	err = nfsd_open(rqstp, fhp, S_IFREG,
			NFSD_MAY_WRITE|NFSD_MAY_NOT_BREAK_LEASE, &file);
	if (err)
		goto out;
	if (EX_ISSYNC(fhp->fh_export)) {
		int err2 = vfs_fsync_range(file, offset, end, 0);

		if (err2 != -EINVAL)
			err = nfserrno(err2);
		else
			err = nfserr_notsupp;
	}

	fput(file);
out:
	return err;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph hellwig
christoph hellwig
105
68.63%
2
16.67%
pre-git
pre-git
19
12.42%
4
33.33%
neil brown
neil brown
10
6.54%
1
8.33%
yamamoto takashi
yamamoto takashi
6
3.92%
1
8.33%
mi jinlong
mi jinlong
6
3.92%
1
8.33%
ben meyers
ben meyers
4
2.61%
1
8.33%
dave hansen
dave hansen
2
1.31%
1
8.33%
trond myklebust
trond myklebust
1
0.65%
1
8.33%
Total
153
100.00%
12
100.00%

#endif /* CONFIG_NFSD_V3 */


static __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 (!uid_eq(current_fsuid(), GLOBAL_ROOT_UID))
		iap->ia_valid &= ~(ATTR_UID|ATTR_GID);
	if (iap->ia_valid)
		return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0);
	/* Callers expect file metadata to be committed here */
	return nfserrno(commit_metadata(resfhp));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph hellwig
christoph hellwig
63
74.12%
1
12.50%
pre-git
pre-git
6
7.06%
2
25.00%
trond myklebust
trond myklebust
5
5.88%
1
12.50%
yamamoto takashi
yamamoto takashi
3
3.53%
1
12.50%
jeff layton
jeff layton
3
3.53%
1
12.50%
andrew morton
andrew morton
3
3.53%
1
12.50%
jan kara
jan kara
2
2.35%
1
12.50%
Total
85
100.00%
8
100.00%

/* HPUX client sometimes creates a file in mode 000, and sets size to 0.
 * setting size to 0 may fail for some specific file systems by the permission
 * checking which requires WRITE permission but the mode is 000.
 * we ignore the resizing(to 0) on the just new created file, since the size is
 * 0 after file created.
 *
 * call this only after vfs_create() is called.
 * */

static void

nfsd_check_ignore_resizing(struct iattr *iap)
{
	if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0))
		iap->ia_valid &= ~ATTR_SIZE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph hellwig
christoph hellwig
36
100.00%
1
100.00%
Total
36
100.00%
1
100.00%

/* The parent directory should already be locked: */

__be32

nfsd_create_locked(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;
	struct inode	*dirp;
	__be32		err;
	__be32		err2;
	int		host_err;

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

	dchild = dget(resfhp->fh_dentry);
	if (!fhp->fh_locked) {
		WARN_ONCE(1, "nfsd_create: parent %pd2 not locked!\n",
				dentry);
		err = nfserr_io;
		goto out;
	}

	err = nfsd_permission(rqstp, fhp->fh_export, dentry, NFSD_MAY_CREATE);
	if (err)
		goto out;

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

	err = 0;
	host_err = 0;
	switch (type) {
	case S_IFREG:
		host_err = vfs_create(dirp, dchild, iap->ia_mode, true);
		if (!host_err)
			nfsd_check_ignore_resizing(iap);
		break;
	case S_IFDIR:
		host_err = vfs_mkdir(dirp, dchild, iap->ia_mode);
		break;
	case S_IFCHR:
	case S_IFBLK:
	case S_IFIFO:
	case S_IFSOCK:
		host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev);
		break;
	default:
		printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n",
		       type);
		host_err = -EINVAL;
	}
	if (host_err < 0)
		goto out_nfserr;

	err = nfsd_create_setattr(rqstp, resfhp, iap);

	/*
         * nfsd_create_setattr already committed the child.  Transactional
         * filesystems had a chance to commit changes for both parent and
         * child simultaneously making the following commit_metadata a
         * noop.
         */
	err2 = nfserrno(commit_metadata(fhp));
	if (err2)
		err = err2;
	/*
         * Update the file handle to get the new inode info.
         */
	if (!err)
		err = fh_update(resfhp);
out:
	dput(dchild);
	return err;

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

Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph hellwig
christoph hellwig
173
51.49%
1
5.00%
pre-git
pre-git
83
24.70%
8
40.00%
oleg drokin
oleg drokin
22
6.55%
1
5.00%
j. bruce fields
j. bruce fields
19
5.65%
2
10.00%
neil brown
neil brown
10
2.98%
1
5.00%
jan kara
jan kara
9
2.68%
1
5.00%
al viro
al viro
7
2.08%
1
5.00%
ben meyers
ben meyers
6
1.79%
1
5.00%
david howells
david howells
3
0.89%
1
5.00%
andrew morton
andrew morton
2
0.60%
1
5.00%
linus torvalds
linus torvalds
1
0.30%
1
5.00%
yamamoto takashi
yamamoto takashi
1
0.30%
1
5.00%
Total
336
100.00%
20
100.00%

/*
 * Create a filesystem object (regular, directory, special).
 * Note that the parent directory is left locked.
 *
 * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp
 */

__be32

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;
	__be32		err;
	int		host_err;

	if (isdotent(fname, flen))
		return nfserr_exist;

	err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_NOP);
	if (err)
		return err;

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

	host_err = fh_want_write(fhp);
	if (host_err)
		return nfserrno(host_err);

	fh_lock_nested(fhp, I_MUTEX_PARENT);
	dchild = lookup_one_len(fname, dentry, flen);
	host_err = PTR_ERR(dchild);
	if (IS_ERR(dchild))
		return nfserrno(host_err);
	err = fh_compose(resfhp, fhp->fh_export, dchild, fhp);
	/*
         * We unconditionally drop our ref to dchild as fh_compose will have
         * already grabbed its own ref for it.
         */
	dput(dchild);
	if (err)
		return err;
	return nfsd_create_locked(rqstp, fhp, fname, flen, iap, type,
					rdev, resfhp);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
j. bruce fields
j. bruce fields
202
97.58%
2
66.67%
josef bacik
josef bacik
5
2.42%
1
33.33%
Total
207
100.00%
3
100.00%

#ifdef CONFIG_NFSD_V3

/*
 * NFSv3 and NFSv4 version of nfsd_create
 */

__be32

do_nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
		char *fname, int flen, struct iattr *iap,
		struct svc_fh *resfhp, int createmode, u32 *verifier,
	        bool *truncp, bool *created)
{
	struct dentry	*dentry, *dchild = NULL;
	struct inode	*dirp;
	__be32		err;
	int		host_err;
	__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, NFSD_MAY_EXEC);
	if (err)
		goto out;

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

	host_err = fh_want_write(fhp);
	if (host_err)
		goto out_nfserr;

	fh_lock_nested(fhp, I_MUTEX_PARENT);

	/*
         * Compose the response file handle.
         */
	dchild = lookup_one_len(fname, dentry, flen);
	host_err = PTR_ERR(dchild);
	if (IS_ERR(dchild))
		goto out_nfserr;

	/* If file doesn't exist, check for permissions to create one */
	if (d_really_is_negative(dchild)) {
		err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE);
		if (err)
			goto out;
	}

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

	if (nfsd_create_is_exclusive(createmode)) {
		/* solaris7 gets confused (bugid 4218508) if these have
                 * 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.
                 */
		v_mtime = verifier[0]&0x7fffffff;
		v_atime = verifier[1]&0x7fffffff;
	}
	
	if (d_really_is_positive(dchild)) {
		err = 0;

		switch (createmode) {
		case NFS3_CREATE_UNCHECKED:
			if (! d_is_reg(dchild))
				goto out;
			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 (   d_inode(dchild)->i_mtime.tv_sec == v_mtime
			    && d_inode(dchild)->i_atime.tv_sec == v_atime
			    && d_inode(dchild)->i_size  == 0 ) {
				if (created)
					*created = 1;
				break;
			}
		case NFS4_CREATE_EXCLUSIVE4_1:
			if (   d_inode(dchild)->i_mtime.tv_sec == v_mtime
			    && d_inode(dchild)->i_atime.tv_sec == v_atime
			    && d_inode(dchild)->i_size  == 0 ) {
				if (created)
					*created = 1;
				goto set_attr;
			}
			 /* fallthru */
		case NFS3_CREATE_GUARDED:
			err = nfserr_exist;
		}
		fh_drop_write(fhp);
		goto out;
	}

	host_err = vfs_create(dirp, dchild, iap->ia_mode, true);
	if (host_err < 0) {
		fh_drop_write(fhp);
		goto out_nfserr;
	}
	if (created)
		*created = 1;

	nfsd_check_ignore_resizing(iap);

	if (nfsd_create_is_exclusive(createmode)) {
		/* Cram the verifier into atime/mtime */
		iap->ia_valid = ATTR_MTIME|ATTR_ATIME
			| ATTR_MTIME_SET|ATTR_ATIME_SET;
		/* 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:
	err = nfsd_create_setattr(rqstp, resfhp, iap);

	/*
         * nfsd_create_setattr already committed the child
         * (and possibly also the parent).
         */
	if (!err)
		err = nfserrno(commit_metadata(fhp));

	/*
         * Update the filehandle to get the new inode info.
         */
	if (!err)
		err = fh_update(resfhp);

 out:
	fh_unlock(fhp);
	if (dchild && !IS_ERR(dchild))
		dput(dchild);
	fh_drop_write(fhp);
 	return err;
 
 out_nfserr:
	err = nfserrno(host_err);
	goto out;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph hellwig
christoph hellwig
430
65.85%
1
4.55%
pre-git
pre-git
132
20.21%
7
31.82%
david howells
david howells
28
4.29%
2
9.09%
jan kara
jan kara
20
3.06%
1
4.55%
j. bruce fields
j. bruce fields
17
2.60%
3
13.64%
ben meyers
ben meyers
11
1.68%
1
4.55%
al viro
al viro
6
0.92%
1
4.55%
casey bodley
casey bodley
3
0.46%
1
4.55%
yamamoto takashi
yamamoto takashi
2
0.31%
1
4.55%
dave hansen
dave hansen
1
0.15%
1
4.55%
neil brown
neil brown
1
0.15%
1
4.55%
david m. richter
david m. richter
1
0.15%
1
4.55%
trond myklebust
trond myklebust
1
0.15%
1
4.55%
Total
653
100.00%
22
100.00%

#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
 */

__be32

nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp)
{
	mm_segment_t	oldfs;
	__be32		err;
	int		host_err;
	struct path path;

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

	path.mnt = fhp->fh_export->ex_path.mnt;
	path.dentry = fhp->fh_dentry;

	err = nfserr_inval;
	if (!d_is_symlink(path.dentry))
		goto out;

	touch_atime(&path);
	/* 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);
	host_err = vfs_readlink(path.dentry, (char __user *)buf, *lenp);
	set_fs(oldfs);

	if (host_err < 0)
		goto out_nfserr;
	*lenp = host_err;
	err = 0;
out:
	return err;

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

Contributors
Person
Tokens
Prop
Commits
CommitProp
pre-git
pre-git
75
44.38%
8
61.54%
christoph hellwig
christoph hellwig
75
44.38%
1
7.69%
miklos szeredi
miklos szeredi
7
4.14%
1
7.69%
al viro
al viro
6
3.55%
1
7.69%
jan kara
jan kara
5
2.96%
1
7.69%
linus torvalds
linus torvalds
1
0.59%
1
7.69%
Total
169
100.00%
13
100.00%

/*
 * Create a symlink and look up its inode
 * N.B. After this call _both_ fhp and resfhp need an fh_put
 */

__be32

nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp,
				char *fname, int flen,
				char *path,
				struct svc_fh *resfhp)
{
	struct dentry	*dentry, *dnew;
	__be32		err, cerr;
	int		host_err;

	err = nfserr_noent;
	if (!flen || path[0] == '\0')
		goto out;
	err = nfserr_exist;
	if (isdotent(fname, flen))
		goto out;

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

	host_err = fh_want_write(fhp);
	if (host_err)
		goto out_nfserr;

	fh_lock(fhp);
	dentry = fhp->fh_dentry;
	dnew = lookup_one_len(fname, dentry, flen);
	host_err = PTR_ERR(dnew);
	if (IS_ERR(dnew))
		goto out_nfserr;

	host_err = vfs_symlink(d_inode(dentry), dnew, path);
	err = nfserrno(host_err);
	if (!err)
		err = nfserrno(commit_metadata(fhp));
	fh_unlock(fhp);

	fh_drop_write(fhp);

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

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

Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph hellwig
christoph hellwig
163
65.73%
1
7.14%
pre-git
pre-git
36
14.52%
5
35.71%
j. bruce fields
j. bruce fields
17
6.85%
3
21.43%
al viro
al viro
16
6.45%
2
14.29%
dave hansen
dave hansen
10
4.03%
1
7.14%
david howells
david howells
3
1.21%
1
7.14%
jan kara
jan kara
3
1.21%
1
7.14%
Total
248
100.00%
14
100.00%

/*
 * Create a hardlink
 * N.B. After this call _both_ ffhp and tfhp need an fh_put
 */

__be32

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;
	__be32		err;
	int		host_err;

	err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE);
	if (err)
		goto out;
	err = fh_verify(rqstp, tfhp, 0, NFSD_MAY_NOP);
	if (err)
		goto out;
	err = nfserr_isdir;
	if (d_is_dir(tfhp->fh_dentry))
		goto out;
	err = nfserr_perm;
	if (!len)
		goto out;
	err = nfserr_exist;
	if (isdotent(name, len))
		goto out;

	host_err = fh_want_write(tfhp);
	if (host_err) {
		err = nfserrno(host_err);
		goto out;
	}

	fh_lock_nested(ffhp, I_MUTEX_PARENT);
	ddir = ffhp->fh_dentry;
	dirp = d_inode(ddir);

	dnew = lookup_one_len(name, ddir, len);
	host_err = PTR_ERR(dnew);
	if (IS_ERR(dnew))
		goto out_nfserr;

	dold = tfhp->fh_dentry;

	err = nfserr_noent;
	if (d_really_is_negative(dold))
		goto out_dput;
	host_err = vfs_link(dold, dirp, dnew, NULL);
	if (!host_err) {
		err = nfserrno(commit_metadata(ffhp));
		if (!err)
			err = nfserrno(commit_metadata(tfhp));
	} else {
		if (host_err == -EXDEV && rqstp->rq_vers == 2)
			err = nfserr_acces;
		else
			err = nfserrno(host_err);
	}
out_dput:
	dput(dnew);
out_unlock:
	fh_unlock(ffhp);
	fh_drop_write(tfhp);
out:
	return err;

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

Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph hellwig
christoph hellwig
173
51.95%
1
5.00%
pre-git
pre-git
113
33.93%
9
45.00%
jan kara
jan kara
12
3.60%
1
5.00%
al viro
al viro
9
2.70%
1
5.00%
david howells
david howells
7
2.10%
2
10.00%
j. bruce fields
j. bruce fields
7
2.10%
2
10.00%
yamamoto takashi
yamamoto takashi
5
1.50%
1
5.00%
peter zijlstra
peter zijlstra
3
0.90%
1
5.00%
dave hansen
dave hansen
2
0.60%
1
5.00%
linus torvalds
linus torvalds
2
0.60%
1
5.00%
Total
333
100.00%
20
100.00%

/*
 * Rename a file
 * N.B. After this call _both_ ffhp and tfhp need an fh_put
 */

__be32

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;
	__be32		err;
	int		host_err;

	err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_REMOVE);
	if (err)
		goto out;
	err = fh_verify(rqstp, tfhp, S_IFDIR, NFSD_MAY_CREATE);
	if (err)
		goto out;

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

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

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

	host_err = fh_want_write(ffhp);
	if (host_err) {
		err = nfserrno(host_err);
		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 = true;
	fill_pre_wcc(ffhp);
	fill_pre_wcc(tfhp);

	odentry = lookup_one_len(fname, fdentry, flen);
	host_err = PTR_ERR(odentry);
	if (IS_ERR(odentry))
		goto out_nfserr;

	host_err = -ENOENT;
	if (d_really_is_negative(odentry))
		goto out_dput_old;
	host_err = -EINVAL;
	if (odentry == trap)
		goto out_dput_old;

	ndentry = lookup_one_len(tname, tdentry, tlen);
	host_err = PTR_ERR(ndentry);
	if (IS_ERR(ndentry))
		goto out_dput_old;
	host_err = -ENOTEMPTY;
	if (ndentry == trap)
		goto out_dput_new;

	host_err = -EXDEV;
	if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt)
		goto out_dput_new;
	if (ffhp->fh_export->ex_path.dentry != tfhp->fh_export->ex_path.dentry)
		goto out_dput_new;

	host_err = vfs_rename(fdir, odentry, tdir, ndentry, NULL, 0);
	if (!host_err) {
		host_err = commit_metadata(tfhp);
		if (!host_err)
			host_err = commit_metadata(ffhp);
	}
 out_dput_new:
	dput(ndentry);
 out_dput_old:
	dput(odentry);
 out_nfserr:
	err = nfserrno(host_err);
	/*
         * We cannot rely 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 = false;
	fh_drop_write(ffhp);

out:
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph hellwig
christoph hellwig
330
71.27%
1
11.11%
david woodhouse
david woodhouse
107
23.11%
3
33.33%
al viro
al viro
12
2.59%
1
11.11%
david howells
david howells
9
1.94%
1
11.11%
jeff layton
jeff layton
2
0.43%
1
11.11%
miklos szeredi
miklos szeredi
2
0.43%
1
11.11%
j. bruce fields
j. bruce fields
1
0.22%
1
11.11%
Total
463
100.00%
9
100.00%

/*
 * Unlink a file or directory
 * N.B. After this call fhp needs an fh_put
 */

__be32

nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
				char *fname, int flen)
{
	struct dentry	*dentry, *rdentry;
	struct inode	*dirp;
	__be32		err;
	int		host_err;

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

	host_err = fh_want_write(fhp);
	if (host_err)
		goto out_nfserr;

	fh_lock_nested(fhp, I_MUTEX_PARENT);
	dentry = fhp->fh_dentry;
	dirp = d_inode(dentry);

	rdentry = lookup_one_len(fname, dentry, flen);
	host_err = PTR_ERR(rdentry);
	if (IS_ERR(rdentry))
		goto out_nfserr;

	if (d_really_is_negative(rdentry)) {
		dput(rdentry);
		err = nfserr_noent;
		goto out;
	}

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

	if (type != S_IFDIR)
		host_err = vfs_unlink(dirp, rdentry, NULL);
	else
		host_err = vfs_rmdir(dirp, rdentry);
	if (!host_err)
		host_err = commit_metadata(fhp);
	dput(rdentry);

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

Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph hellwig
christoph hellwig
153
63.75%
1
7.69%
pre-git
pre-git
56
23.33%
4
30.77%
neil brown
neil brown
15
6.25%
4
30.77%
david howells
david howells
9
3.75%
1
7.69%
bernd schubert
bernd schubert
5
2.08%
1
7.69%
kendrick m. smith
kendrick m. smith
1
0.42%
1
7.69%
al viro
al viro
1
0.42%
1
7.69%
Total
240
100.00%
13
100.00%

/*
 * We do this buffering because we must not call back into the file
 * system's ->lookup() method from the filldir callback. That may well
 * deadlock a number of file systems.
 *
 * This is based heavily on the implementation of same in XFS.
 */

struct buffered_dirent {
	
u64		ino;
	
loff_t		offset;
	
int		namlen;
	
unsigned int	d_type;
	
char		name[];
};


struct readdir_data {
	
struct dir_context ctx;
	
char		*dirent;
	
size_t		used;
	
int		full;
};



static int nfsd_buffered_filldir(struct dir_context *ctx, const char *name,
				 int namlen, loff_t offset, u64 ino,
				 unsigned int d_type)
{
	struct readdir_data *buf =
		container_of(ctx, struct readdir_data, ctx);
	struct buffered_dirent *de = (void *)(buf->dirent + buf->used);
	unsigned int reclen;

	reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64));
	if (buf->used + reclen > PAGE_SIZE) {
		buf->full = 1;
		return -EINVAL;
	}

	de->namlen = namlen;
	de->offset = offset;
	de->ino = ino;
	de->d_type = d_type;
	memcpy(de->name, name, namlen);
	buf->used += reclen;

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph hellwig
christoph hellwig
113
74.83%
2
25.00%
pre-git
pre-git
14
9.27%
3
37.50%
miklos szeredi
miklos szeredi
12
7.95%
1
12.50%
takashi iwai
takashi iwai
10
6.62%
1
12.50%
j. bruce fields
j. bruce fields
2
1.32%
1
12.50%
Total
151
100.00%
8
100.00%



static __be32 nfsd_buffered_readdir(struct file *file, nfsd_filldir_t func,
				    struct readdir_cd *cdp, loff_t *offsetp)
{
	struct buffered_dirent *de;
	int host_err;
	int size;
	loff_t offset;
	struct readdir_data buf = {
		.ctx.actor = nfsd_buffered_filldir,
		.dirent = (void *)__get_free_page(GFP_KERNEL)
	};

	if (!buf.dirent)
		return nfserrno(-ENOMEM);

	offset = *offsetp;

	while (1) {
		unsigned int reclen;

		cdp->err = nfserr_eof; /* will be cleared on successful read */
		buf.used = 0;
		buf.full = 0;

		host_err = iterate_dir(file, &buf.ctx);
		if (buf.full)
			host_err = 0;

		if (host_err < 0)
			break;

		size = buf.used;

		if (!size)
			break;

		de = (struct buffered_dirent *)buf.dirent;
		while (size > 0) {
			offset = de->offset;

			if (func(cdp, de->name, de->namlen, de->offset,
				 de->ino, de->d_type))
				break;

			if (cdp->err != nfs_ok)
				break;

			reclen = ALIGN(sizeof(*de) + de->namlen,
				       sizeof(u64));
			size -= reclen;
			de = (struct buffered_dirent *)((char *)de + reclen);
		}
		if (size > 0) /* We bailed out early */
			break;

		offset = vfs_llseek(file, 0, SEEK_CUR);
	}

	free_page((unsigned long)(buf.dirent));

	if (host_err)
		return nfserrno(host_err);

	*offsetp = offset;
	return cdp->err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph hellwig
christoph hellwig
229
74.84%
1
5.88%
pre-git
pre-git
55
17.97%
5
29.41%
j. bruce fields
j. bruce fields
8
2.61%
4
23.53%
jeff layton
jeff layton
5
1.63%
1
5.88%
neil brown
neil brown
3
0.98%
2
11.76%
dave hansen
dave hansen
2
0.65%
1
5.88%
eric w. biederman
eric w. biederman
2
0.65%
1
5.88%
al viro
al viro
1
0.33%
1
5.88%
miklos szeredi
miklos szeredi
1
0.33%
1
5.88%
Total
306
100.00%
17
100.00%

/*
 * Read entries from a directory.
 * The  NFSv3/4 verifier we ignore for now.
 */

__be32

nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, 
	     struct readdir_cd *cdp, nfsd_filldir_t func)
{
	__be32		err;
	struct file	*file;
	loff_t		offset = *offsetp;
	int             may_flags = NFSD_MAY_READ;

	/* NFSv2 only supports 32 bit cookies */
	if (rqstp->rq_vers > 2)
		may_flags |= NFSD_MAY_64BIT_COOKIE;

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

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

	err = nfsd_buffered_readdir(file, func, cdp, offsetp);

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

Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph hellwig
christoph hellwig
120
77.92%
2
25.00%
pre-git
pre-git
19
12.34%
2
25.00%
greg banks
greg banks
10
6.49%
1
12.50%
jeff layton
jeff layton
3
1.95%
1
12.50%
miklos szeredi
miklos szeredi
1
0.65%
1
12.50%
yan burman
yan burman
1
0.65%
1
12.50%
Total
154
100.00%
8
100.00%

/*
 * Get file system stats
 * N.B. After this call fhp needs an fh_put
 */

__be32

nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat, int access)
{
	__be32 err;

	err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access);
	if (!err) {
		struct path path = {
			.mnt	= fhp->fh_export->ex_path.mnt,
			.dentry	= fhp->fh_dentry,
                };
		if (vfs_statfs(&path, stat))
			err = nfserr_io;
	}
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph hellwig
christoph hellwig
69
77.53%
1
20.00%
jeff layton
jeff layton
11
12.36%
1
20.00%
greg banks
greg banks
5
5.62%
1
20.00%
pre-git
pre-git
4
4.49%
2
40.00%
Total
89
100.00%
5
100.00%



static int exp_rdonly(struct svc_rqst *rqstp, struct svc_export *exp)
{
	return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph hellwig
christoph hellwig
24
92.31%
1
50.00%
andreas gruenbacher
andreas gruenbacher
2
7.69%
1
50.00%
Total
26
100.00%
2
100.00%

/*
 * Check for a user's access permissions to this inode.
 */

__be32

nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp,
					struct dentry *dentry, int acc)
{
	struct inode	*inode = d_inode(dentry);
	int		err;

	if ((acc & NFSD_MAY_MASK) == NFSD_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 & NFSD_MAY_READ)?  " read"  : "",
                (acc & NFSD_MAY_WRITE)? " write" : "",
                (acc & NFSD_MAY_EXEC)?  " exec"  : "",
                (acc & NFSD_MAY_SATTR)? " sattr" : "",
                (acc & NFSD_MAY_TRUNC)? " trunc" : "",
                (acc & NFSD_MAY_LOCK)?  " lock"  : "",
                (acc & NFSD_MAY_OWNER_OVERRIDE)? " owneroverride" : "",
                inode->i_mode,
                IS_IMMUTABLE(inode)?    " immut" : "",
                IS_APPEND(inode)?       " append" : "",
                __mnt_is_readonly(exp->ex_path.mnt)?    " 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 & NFSD_MAY_LOCAL_ACCESS))
		if (acc & (NFSD_MAY_WRITE | NFSD_MAY_SATTR | NFSD_MAY_TRUNC)) {
			if (exp_rdonly(rqstp, exp) ||
			    __mnt_is_readonly(exp->ex_path.mnt))
				return nfserr_rofs;
			if (/* (acc & NFSD_MAY_WRITE) && */ IS_IMMUTABLE(inode))
				return nfserr_perm;
		}
	if ((acc & NFSD_MAY_TRUNC) && IS_APPEND(inode))
		return nfserr_perm;

	if (acc & NFSD_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 = NFSD_MAY_READ | NFSD_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 & NFSD_MAY_OWNER_OVERRIDE) &&
	    uid_eq(inode->i_uid, current_fsuid()))
		return 0;

	/* This assumes  NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */
	err = inode_permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC));

	/* Allow read access to binaries even when mode 111 */
	if (err == -EACCES && S_ISREG(inode->i_mode) &&
	     (acc == (NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE) ||
	      acc == (NFSD_MAY_READ | NFSD_MAY_READ_IF_EXEC)))
		err = inode_permission(inode, MAY_EXEC);

	return err? nfserrno(err) : 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph hellwig
christoph hellwig
191
77.64%
2
50.00%
andreas gruenbacher
andreas gruenbacher
52
21.14%
1
25.00%
david howells
david howells
3
1.22%
1
25.00%
Total
246
100.00%
4
100.00%


void

nfsd_racache_shutdown(void)
{
	struct raparms *raparm, *last_raparm;
	unsigned int i;

	dprintk("nfsd: freeing readahead buffers.\n");

	for (i = 0; i < RAPARM_HASH_SIZE; i++) {
		raparm = raparm_hash[i].pb_head;
		while(raparm) {
			last_raparm = raparm;
			raparm = raparm->p_next;
			kfree(last_raparm);
		}
		raparm_hash[i].pb_head = NULL;
	}
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph hellwig
christoph hellwig
56
71.79%
1
50.00%
andreas gruenbacher
andreas gruenbacher
22
28.21%
1
50.00%
Total
78
100.00%
2
100.00%

/*
 * Initialize readahead param cache
 */

int

nfsd_racache_init(int cache_size)
{
	int	i;
	int	j = 0;
	int	nperbucket;
	struct raparms **raparm = NULL;


	if (raparm_hash[0].pb_head)
		return 0;
	nperbucket = DIV_ROUND_UP(cache_size, RAPARM_HASH_SIZE);
	nperbucket = max(2, nperbucket);
	cache_size = nperbucket * RAPARM_HASH_SIZE;

	dprintk("nfsd: allocating %d readahead buffers.\n", cache_size);

	for (i = 0; i < RAPARM_HASH_SIZE; i++) {
		spin_lock_init(&raparm_hash[i].pb_lock);

		raparm = &raparm_hash[i].pb_head;
		for (j = 0; j < nperbucket; j++) {
			*raparm = kzalloc(sizeof(struct raparms), GFP_KERNEL);
			if (!*raparm)
				goto out_nomem;
			raparm = &(*raparm)->p_next;
		}
		*raparm = NULL;
	}

	nfsdstats.ra_size = cache_size;
	return 0;

out_nomem:
	dprintk("nfsd: kmalloc failed, freeing readahead buffers\n");
	nfsd_racache_shutdown();
	return -ENOMEM;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph hellwig
christoph hellwig
132
72.53%
1
20.00%
andreas gruenbacher
andreas gruenbacher
39
21.43%
1
20.00%
kinglong mee
kinglong mee
5
2.75%
1
20.00%
dave hansen
dave hansen
4
2.20%
1
20.00%
florin malita
florin malita
2
1.10%
1
20.00%
Total
182
100.00%
5
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph hellwig
christoph hellwig
4509
51.71%
16
7.80%
j. bruce fields
j. bruce fields
1238
14.20%
36
17.56%
pre-git
pre-git
1020
11.70%
35
17.07%
neil brown
neil brown
549
6.30%
22
10.73%
jeff layton
jeff layton
217
2.49%
10
4.88%
al viro
al viro
139
1.59%
13
6.34%
anna schumaker
anna schumaker
136
1.56%
2
0.98%
andreas gruenbacher
andreas gruenbacher
117
1.34%
1
0.49%
david woodhouse
david woodhouse
107
1.23%
3
1.46%
david howells
david howells
99
1.14%
3
1.46%
ben meyers
ben meyers
90
1.03%
1
0.49%
jan kara
jan kara
59
0.68%
1
0.49%
greg banks
greg banks
50
0.57%
1
0.49%
kinglong mee
kinglong mee
39
0.45%
3
1.46%
miklos szeredi
miklos szeredi
32
0.37%
5
2.44%
david quigley
david quigley
32
0.37%
1
0.49%
sachin prabhu
sachin prabhu
29
0.33%
2
0.98%
andrew morton
andrew morton
26
0.30%
8
3.90%
linus torvalds
linus torvalds
25
0.29%
4
1.95%
trond myklebust
trond myklebust
25
0.29%
4
1.95%
oleg drokin
oleg drokin
22
0.25%
1
0.49%
dave hansen
dave hansen
22
0.25%
6
2.93%
andy adamson
andy adamson
18
0.21%
1
0.49%
yamamoto takashi
yamamoto takashi
18
0.21%
1
0.49%
boaz harrosh
boaz harrosh
17
0.19%
1
0.49%
wengang wang
wengang wang
14
0.16%
1
0.49%
takashi iwai
takashi iwai
10
0.11%
1
0.49%
mi jinlong
mi jinlong
7
0.08%
1
0.49%
jan blunck
jan blunck
6
0.07%
1
0.49%
bernd schubert
bernd schubert
5
0.06%
1
0.49%
josef bacik
josef bacik
5
0.06%
1
0.49%
steve dickson
steve dickson
5
0.06%
1
0.49%
eric w. biederman
eric w. biederman
4
0.05%
2
0.98%
casey bodley
casey bodley
3
0.03%
1
0.49%
krishna kumar
krishna kumar
3
0.03%
1
0.49%
peter zijlstra
peter zijlstra
3
0.03%
1
0.49%
tejun heo
tejun heo
3
0.03%
1
0.49%
kendrick m. smith
kendrick m. smith
3
0.03%
2
0.98%
florin malita
florin malita
2
0.02%
1
0.49%
mimi zohar
mimi zohar
2
0.02%
1
0.49%
chuck lever
chuck lever
2
0.02%
1
0.49%
dmitry kasatkin
dmitry kasatkin
2
0.02%
1
0.49%
amir goldstein
amir goldstein
1
0.01%
1
0.49%
david shaw
david shaw
1
0.01%
1
0.49%
yan burman
yan burman
1
0.01%
1
0.49%
david m. richter
david m. richter
1
0.01%
1
0.49%
jens axboe
jens axboe
1
0.01%
1
0.49%
Total
8719
100.00%
205
100.00%
Directory: fs/nfsd

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