cregit-Linux how code gets into the kernel

Release 4.11 fs/nfsd/nfsfh.c

Directory: fs/nfsd
/*
 * NFS server file handle treatment.
 *
 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
 * Portions Copyright (C) 1999 G. Allen Morris III <gam3@acm.org>
 * Extensive rewrite by Neil Brown <neilb@cse.unsw.edu.au> Southern-Spring 1999
 * ... and again Southern-Winter 2001 to support export_operations
 */

#include <linux/exportfs.h>

#include <linux/sunrpc/svcauth_gss.h>
#include "nfsd.h"
#include "vfs.h"
#include "auth.h"


#define NFSDDBG_FACILITY		NFSDDBG_FH


/*
 * our acceptability function.
 * if NOSUBTREECHECK, accept anything
 * if not, require that we can walk up to exp->ex_dentry
 * doing some checks on the 'x' bits
 */



static int nfsd_acceptable(void *expv, struct dentry *dentry)
{
	struct svc_export *exp = expv;
	int rv;
	struct dentry *tdentry;
	struct dentry *parent;

	if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
		return 1;

	tdentry = dget(dentry);
	while (tdentry != exp->ex_path.dentry && !IS_ROOT(tdentry)) {
		/* make sure parents give x permission to user */
		int err;
		parent = dget_parent(tdentry);
		err = inode_permission(d_inode(parent), MAY_EXEC);
		if (err < 0) {
			dput(parent);
			break;
		}
		dput(tdentry);
		tdentry = parent;
	}
	if (tdentry != exp->ex_path.dentry)
		dprintk("nfsd_acceptable failed at %p %pd\n", tdentry, tdentry);
	rv = (tdentry == exp->ex_path.dentry);
	dput(tdentry);
	return rv;
}


Contributors
PersonTokensPropCommitsCommitProp
Neil Brown11070.51%333.33%


Al Viro3321.15%333.33%


Jan Blunck95.77%111.11%


David Howells31.92%111.11%


Andrew Morton10.64%111.11%


Total156100.00%9100.00%



/* Type check. The correct error return for type mismatches does not seem to be
 * generally agreed upon. SunOS seems to use EISDIR if file isn't S_IFREG; a
 * comment in the NFSv3 spec says this is incorrect (implementation notes for
 * the write call).
 */


static inline __be32

nfsd_mode_check(struct svc_rqst *rqstp, struct dentry *dentry,
		umode_t requested)
{
	umode_t mode = d_inode(dentry)->i_mode & S_IFMT;

	if (requested == 0) /* the caller doesn't care */
		return nfs_ok;
	if (mode == requested) {
		if (mode == S_IFDIR && !d_can_lookup(dentry)) {
			WARN_ON_ONCE(1);
			return nfserr_notdir;
		}
		return nfs_ok;
	}
	/*
         * v4 has an error more specific than err_notdir which we should
         * return in preference to err_notdir:
         */
	if (rqstp->rq_vers == 4 && mode == S_IFLNK)
		return nfserr_symlink;
	if (requested == S_IFDIR)
		return nfserr_notdir;
	if (mode == S_IFDIR)
		return nfserr_isdir;
	return nfserr_inval;
}


Contributors
PersonTokensPropCommitsCommitProp
J. Bruce Fields5750.89%240.00%


Neil Brown5347.32%120.00%


Al Viro21.79%240.00%


Total112100.00%5100.00%






static __be32 nfsd_setuser_and_check_port(struct svc_rqst *rqstp,
					  struct svc_export *exp)
{
	int flags = nfsexp_flags(rqstp, exp);

	/* Check if the request originated from a secure port. */
	if (!test_bit(RQ_SECURE, &rqstp->rq_flags) && !(flags & NFSEXP_INSECURE_PORT)) {
		RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
		dprintk("nfsd: request from insecure port %s!\n",
		        svc_print_addr(rqstp, buf, sizeof(buf)));
		return nfserr_perm;
	}

	/* Set user creds for this exportpoint */
	return nfserrno(nfsd_setuser(rqstp, exp));
}


Contributors
PersonTokensPropCommitsCommitProp
J. Bruce Fields7486.05%360.00%


Jeff Layton78.14%120.00%


Pavel Emelyanov55.81%120.00%


Total86100.00%5100.00%






static inline __be32 check_pseudo_root(struct svc_rqst *rqstp,
	struct dentry *dentry, struct svc_export *exp)
{
	if (!(exp->ex_flags & NFSEXP_V4ROOT))
		return nfs_ok;
	/*
         * v2/v3 clients have no need for the V4ROOT export--they use
         * the mount protocl instead; also, further V4ROOT checks may be
         * in v4-specific code, in which case v2/v3 clients could bypass
         * them.
         */
	if (!nfsd_v4client(rqstp))
		return nfserr_stale;
	/*
         * We're exposing only the directories and symlinks that have to be
         * traversed on the way to real exports:
         */
	if (unlikely(!d_is_dir(dentry) &&
		     !d_is_symlink(dentry)))
		return nfserr_stale;
	/*
         * A pseudoroot export gives permission to access only one
         * single directory; the kernel has to make another upcall
         * before granting access to anything else under it:
         */
	if (unlikely(dentry != exp->ex_path.dentry))
		return nfserr_stale;
	return nfs_ok;
}


Contributors
PersonTokensPropCommitsCommitProp
Steve Dickson8797.75%150.00%


David Howells22.25%150.00%


Total89100.00%2100.00%



/*
 * Use the given filehandle to look up the corresponding export and
 * dentry.  On success, the results are used to set fh_export and
 * fh_dentry.
 */



static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp)
{
	struct knfsd_fh	*fh = &fhp->fh_handle;
	struct fid *fid = NULL, sfid;
	struct svc_export *exp;
	struct dentry *dentry;
	int fileid_type;
	int data_left = fh->fh_size/4;
	__be32 error;

	error = nfserr_stale;
	if (rqstp->rq_vers > 2)
		error = nfserr_badhandle;
	if (rqstp->rq_vers == 4 && fh->fh_size == 0)
		return nfserr_nofilehandle;

	if (fh->fh_version == 1) {
		int len;

		if (--data_left < 0)
			return error;
		if (fh->fh_auth_type != 0)
			return error;
		len = key_len(fh->fh_fsid_type) / 4;
		if (len == 0)
			return error;
		if  (fh->fh_fsid_type == FSID_MAJOR_MINOR) {
			/* deprecated, convert to type 3 */
			len = key_len(FSID_ENCODE_DEV)/4;
			fh->fh_fsid_type = FSID_ENCODE_DEV;
			/*
                         * struct knfsd_fh uses host-endian fields, which are
                         * sometimes used to hold net-endian values. This
                         * confuses sparse, so we must use __force here to
                         * keep it from complaining.
                         */
			fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl((__force __be32)fh->fh_fsid[0]),
							ntohl((__force __be32)fh->fh_fsid[1])));
			fh->fh_fsid[1] = fh->fh_fsid[2];
		}
		data_left -= len;
		if (data_left < 0)
			return error;
		exp = rqst_exp_find(rqstp, fh->fh_fsid_type, fh->fh_fsid);
		fid = (struct fid *)(fh->fh_fsid + len);
	} else {
		__u32 tfh[2];
		dev_t xdev;
		ino_t xino;

		if (fh->fh_size != NFS_FHSIZE)
			return error;
		/* assume old filehandle format */
		xdev = old_decode_dev(fh->ofh_xdev);
		xino = u32_to_ino_t(fh->ofh_xino);
		mk_fsid(FSID_DEV, tfh, xdev, xino, 0, NULL);
		exp = rqst_exp_find(rqstp, FSID_DEV, tfh);
	}

	error = nfserr_stale;
	if (PTR_ERR(exp) == -ENOENT)
		return error;

	if (IS_ERR(exp))
		return nfserrno(PTR_ERR(exp));

	if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) {
		/* Elevate privileges so that the lack of 'r' or 'x'
                 * permission on some parent directory will
                 * not stop exportfs_decode_fh from being able
                 * to reconnect a directory into the dentry cache.
                 * The same problem can affect "SUBTREECHECK" exports,
                 * but as nfsd_acceptable depends on correct
                 * access control settings being in effect, we cannot
                 * fix that case easily.
                 */
		struct cred *new = prepare_creds();
		if (!new) {
			error =  nfserrno(-ENOMEM);
			goto out;
		}
		new->cap_effective =
			cap_raise_nfsd_set(new->cap_effective,
					   new->cap_permitted);
		put_cred(override_creds(new));
		put_cred(new);
	} else {
		error = nfsd_setuser_and_check_port(rqstp, exp);
		if (error)
			goto out;
	}

	/*
         * Look up the dentry using the NFS file handle.
         */
	error = nfserr_stale;
	if (rqstp->rq_vers > 2)
		error = nfserr_badhandle;

	if (fh->fh_version != 1) {
		sfid.i32.ino = fh->ofh_ino;
		sfid.i32.gen = fh->ofh_generation;
		sfid.i32.parent_ino = fh->ofh_dirino;
		fid = &sfid;
		data_left = 3;
		if (fh->ofh_dirino == 0)
			fileid_type = FILEID_INO32_GEN;
		else
			fileid_type = FILEID_INO32_GEN_PARENT;
	} else
		fileid_type = fh->fh_fileid_type;

	if (fileid_type == FILEID_ROOT)
		dentry = dget(exp->ex_path.dentry);
	else {
		dentry = exportfs_decode_fh(exp->ex_path.mnt, fid,
				data_left, fileid_type,
				nfsd_acceptable, exp);
	}
	if (dentry == NULL)
		goto out;
	if (IS_ERR(dentry)) {
		if (PTR_ERR(dentry) != -EINVAL)
			error = nfserrno(PTR_ERR(dentry));
		goto out;
	}

	if (d_is_dir(dentry) &&
			(dentry->d_flags & DCACHE_DISCONNECTED)) {
		printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %pd2\n",
				dentry);
	}

	fhp->fh_dentry = dentry;
	fhp->fh_export = exp;
	return 0;
out:
	exp_put(exp);
	return error;
}


Contributors
PersonTokensPropCommitsCommitProp
Neil Brown23734.80%1027.03%


Linus Torvalds (pre-git)22432.89%513.51%


J. Bruce Fields7611.16%616.22%


Christoph Hellwig466.75%38.11%


David Howells385.58%38.11%


Kendrick M. Smith213.08%25.41%


Linus Torvalds111.62%25.41%


Jeff Layton91.32%12.70%


Kinglong Mee81.17%12.70%


Jan Blunck60.88%12.70%


Al Viro50.73%38.11%


Total681100.00%37100.00%



/**
 * fh_verify - filehandle lookup and access checking
 * @rqstp: pointer to current rpc request
 * @fhp: filehandle to be verified
 * @type: expected type of object pointed to by filehandle
 * @access: type of access needed to object
 *
 * Look up a dentry from the on-the-wire filehandle, check the client's
 * access to the export, and set the current task's credentials.
 *
 * Regardless of success or failure of fh_verify(), fh_put() should be
 * called on @fhp when the caller is finished with the filehandle.
 *
 * fh_verify() may be called multiple times on a given filehandle, for
 * example, when processing an NFSv4 compound.  The first call will look
 * up a dentry using the on-the-wire filehandle.  Subsequent calls will
 * skip the lookup and just perform the other checks and possibly change
 * the current task's credentials.
 *
 * @type specifies the type of object expected using one of the S_IF*
 * constants defined in include/linux/stat.h.  The caller may use zero
 * to indicate that it doesn't care, or a negative integer to indicate
 * that it expects something not of the given type.
 *
 * @access is formed from the NFSD_MAY_* constants defined in
 * fs/nfsd/vfs.h.
 */


__be32

fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, int access)
{
	struct svc_export *exp;
	struct dentry	*dentry;
	__be32		error;

	dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp));

	if (!fhp->fh_dentry) {
		error = nfsd_set_fh_dentry(rqstp, fhp);
		if (error)
			goto out;
	}
	dentry = fhp->fh_dentry;
	exp = fhp->fh_export;
	/*
         * We still have to do all these permission checks, even when
         * fh_dentry is already set:
         *      - fh_verify may be called multiple times with different
         *        "access" arguments (e.g. nfsd_proc_create calls
         *        fh_verify(...,NFSD_MAY_EXEC) first, then later (in
         *        nfsd_create) calls fh_verify(...,NFSD_MAY_CREATE).
         *      - in the NFSv4 case, the filehandle may have been filled
         *        in by fh_compose, and given a dentry, but further
         *        compound operations performed with that filehandle
         *        still need permissions checks.  In the worst case, a
         *        mountpoint crossing may have changed the export
         *        options, and we may now need to use a different uid
         *        (for example, if different id-squashing options are in
         *        effect on the new filesystem).
         */
	error = check_pseudo_root(rqstp, dentry, exp);
	if (error)
		goto out;

	error = nfsd_setuser_and_check_port(rqstp, exp);
	if (error)
		goto out;

	error = nfsd_mode_check(rqstp, dentry, type);
	if (error)
		goto out;

	/*
         * pseudoflavor restrictions are not enforced on NLM,
         * which clients virtually always use auth_sys for,
         * even while using RPCSEC_GSS for NFS.
         */
	if (access & NFSD_MAY_LOCK || access & NFSD_MAY_BYPASS_GSS)
		goto skip_pseudoflavor_check;
	/*
         * Clients may expect to be able to use auth_sys during mount,
         * even if they use gss for everything else; see section 2.3.2
         * of rfc 2623.
         */
	if (access & NFSD_MAY_BYPASS_GSS_ON_ROOT
			&& exp->ex_path.dentry == dentry)
		goto skip_pseudoflavor_check;

	error = check_nfsd_access(exp, rqstp);
	if (error)
		goto out;

skip_pseudoflavor_check:
	/* Finally, check access permissions. */
	error = nfsd_permission(rqstp, exp, dentry, access);

	if (error) {
		dprintk("fh_verify: %pd2 permission failure, "
			"acc=%x, error=%d\n",
			dentry,
			access, ntohl(error));
	}
out:
	if (error == nfserr_stale)
		nfsdstats.fh_stale++;
	return error;
}



Contributors
PersonTokensPropCommitsCommitProp
J. Bruce Fields12653.62%936.00%


Linus Torvalds (pre-git)4318.30%416.00%


Neil Brown239.79%416.00%


Steve Dickson187.66%14.00%


Andy Adamson166.81%14.00%


Al Viro52.13%312.00%


Kendrick M. Smith20.85%14.00%


David Howells10.43%14.00%


Miklos Szeredi10.43%14.00%


Total235100.00%25100.00%



/*
 * Compose a file handle for an NFS reply.
 *
 * Note that when first composed, the dentry may not yet have
 * an inode.  In this case a call to fh_update should be made
 * before the fh goes out on the wire ...
 */



static void _fh_update(struct svc_fh *fhp, struct svc_export *exp,
		struct dentry *dentry)
{
	if (dentry != exp->ex_path.dentry) {
		struct fid *fid = (struct fid *)
			(fhp->fh_handle.fh_fsid + fhp->fh_handle.fh_size/4 - 1);
		int maxsize = (fhp->fh_maxsize - fhp->fh_handle.fh_size)/4;
		int subtreecheck = !(exp->ex_flags & NFSEXP_NOSUBTREECHECK);

		fhp->fh_handle.fh_fileid_type =
			exportfs_encode_fh(dentry, fid, &maxsize, subtreecheck);
		fhp->fh_handle.fh_size += maxsize * 4;
	} else {
		fhp->fh_handle.fh_fileid_type = FILEID_ROOT;
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Christoph Hellwig9372.09%225.00%


Linus Torvalds (pre-git)1914.73%112.50%


Neil Brown107.75%225.00%


Linus Torvalds43.10%225.00%


Jan Blunck32.33%112.50%


Total129100.00%8100.00%



/*
 * for composing old style file handles
 */



static inline void _fh_update_old(struct dentry *dentry,
				  struct svc_export *exp,
				  struct knfsd_fh *fh)
{
	fh->ofh_ino = ino_t_to_u32(d_inode(dentry)->i_ino);
	fh->ofh_generation = d_inode(dentry)->i_generation;
	if (d_is_dir(dentry) ||
	    (exp->ex_flags & NFSEXP_NOSUBTREECHECK))
		fh->ofh_dirino = 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds6088.24%125.00%


David Howells710.29%250.00%


Neil Brown11.47%125.00%


Total68100.00%4100.00%






static bool is_root_export(struct svc_export *exp)
{
	return exp->ex_path.dentry == exp->ex_path.dentry->d_sb->s_root;
}


Contributors
PersonTokensPropCommitsCommitProp
J. Bruce Fields28100.00%1100.00%


Total28100.00%1100.00%






static struct super_block *exp_sb(struct svc_export *exp)
{
	return exp->ex_path.dentry->d_sb;
}


Contributors
PersonTokensPropCommitsCommitProp
J. Bruce Fields2195.45%150.00%


Al Viro14.55%150.00%


Total22100.00%2100.00%






static bool fsid_type_ok_for_exp(u8 fsid_type, struct svc_export *exp)
{
	switch (fsid_type) {
	case FSID_DEV:
		if (!old_valid_dev(exp_sb(exp)->s_dev))
			return 0;
		/* FALL THROUGH */
	case FSID_MAJOR_MINOR:
	case FSID_ENCODE_DEV:
		return exp_sb(exp)->s_type->fs_flags & FS_REQUIRES_DEV;
	case FSID_NUM:
		return exp->ex_flags & NFSEXP_FSID;
	case FSID_UUID8:
	case FSID_UUID16:
		if (!is_root_export(exp))
			return 0;
		/* fall through */
	case FSID_UUID4_INUM:
	case FSID_UUID16_INUM:
		return exp->ex_uuid != NULL;
	}
	return 1;
}



Contributors
PersonTokensPropCommitsCommitProp
J. Bruce Fields102100.00%1100.00%


Total102100.00%1100.00%






static void set_version_and_fsid_type(struct svc_fh *fhp, struct svc_export *exp, struct svc_fh *ref_fh)
{
	u8 version;
	u8 fsid_type;
retry:
	version = 1;
	if (ref_fh && ref_fh->fh_export == exp) {
		version = ref_fh->fh_handle.fh_version;
		fsid_type = ref_fh->fh_handle.fh_fsid_type;

		ref_fh = NULL;

		switch (version) {
		case 0xca:
			fsid_type = FSID_DEV;
			break;
		case 1:
			break;
		default:
			goto retry;
		}

		/*
                 * As the fsid -> filesystem mapping was guided by
                 * user-space, there is no guarantee that the filesystem
                 * actually supports that fsid type. If it doesn't we
                 * loop around again without ref_fh set.
                 */
		if (!fsid_type_ok_for_exp(fsid_type, exp))
			goto retry;
	} else if (exp->ex_flags & NFSEXP_FSID) {
		fsid_type = FSID_NUM;
	} else if (exp->ex_uuid) {
		if (fhp->fh_maxsize >= 64) {
			if (is_root_export(exp))
				fsid_type = FSID_UUID16;
			else
				fsid_type = FSID_UUID16_INUM;
		} else {
			if (is_root_export(exp))
				fsid_type = FSID_UUID8;
			else
				fsid_type = FSID_UUID4_INUM;
		}
	} else if (!old_valid_dev(exp_sb(exp)->s_dev))
		/* for newer device numbers, we must use a newer fsid format */
		fsid_type = FSID_ENCODE_DEV;
	else
		fsid_type = FSID_DEV;
	fhp->fh_handle.fh_version = version;
	if (version)
		fhp->fh_handle.fh_fsid_type = fsid_type;
}


Contributors
PersonTokensPropCommitsCommitProp
Neil Brown11955.61%535.71%


J. Bruce Fields4320.09%214.29%


Steve Dickson157.01%17.14%


Linus Torvalds (pre-git)157.01%214.29%


Al Viro104.67%17.14%


Bruce W Allan62.80%17.14%


Kendrick M. Smith31.40%17.14%


Linus Torvalds31.40%17.14%


Total214100.00%14100.00%





__be32

fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry,
	   struct svc_fh *ref_fh)
{
	/* ref_fh is a reference file handle.
         * if it is non-null and for the same filesystem, then we should compose
         * a filehandle which is of the same version, where possible.
         * Currently, that means that if ref_fh->fh_handle.fh_version == 0xca
         * Then create a 32byte filehandle using nfs_fhbase_old
         *
         */

	struct inode * inode = d_inode(dentry);
	dev_t ex_dev = exp_sb(exp)->s_dev;

	dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %pd2, ino=%ld)\n",
		MAJOR(ex_dev), MINOR(ex_dev),
		(long) d_inode(exp->ex_path.dentry)->i_ino,
		dentry,
		(inode ? inode->i_ino : 0));

	/* Choose filehandle version and fsid type based on
         * the reference filehandle (if it is in the same export)
         * or the export options.
         */
	set_version_and_fsid_type(fhp, exp, ref_fh);

	if (ref_fh == fhp)
		fh_put(ref_fh);

	if (fhp->fh_locked || fhp->fh_dentry) {
		printk(KERN_ERR "fh_compose: fh %pd2 not initialized!\n",
		       dentry);
	}
	if (fhp->fh_maxsize < NFS_FHSIZE)
		printk(KERN_ERR "fh_compose: called with maxsize %d! %pd2\n",
		       fhp->fh_maxsize,
		       dentry);

	fhp->fh_dentry = dget(dentry); /* our internal copy */
	fhp->fh_export = exp_get(exp);

	if (fhp->fh_handle.fh_version == 0xca) {
		/* old style filehandle please */
		memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE);
		fhp->fh_handle.fh_size = NFS_FHSIZE;
		fhp->fh_handle.ofh_dcookie = 0xfeebbaca;
		fhp->fh_handle.ofh_dev =  old_encode_dev(ex_dev);
		fhp->fh_handle.ofh_xdev = fhp->fh_handle.ofh_dev;
		fhp->fh_handle.ofh_xino =
			ino_t_to_u32(d_inode(exp->ex_path.dentry)->i_ino);
		fhp->fh_handle.ofh_dirino = ino_t_to_u32(parent_ino(dentry));
		if (inode)
			_fh_update_old(dentry, exp, &fhp->fh_handle);
	} else {
		fhp->fh_handle.fh_size =
			key_len(fhp->fh_handle.fh_fsid_type) + 4;
		fhp->fh_handle.fh_auth_type = 0;

		mk_fsid(fhp->fh_handle.fh_fsid_type,
			fhp->fh_handle.fh_fsid,
			ex_dev,
			d_inode(exp->ex_path.dentry)->i_ino,
			exp->ex_fsid, exp->ex_uuid);

		if (inode)
			_fh_update(fhp, exp, dentry);
		if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID) {
			fh_put(fhp);
			return nfserr_opnotsupp;
		}
	}

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
J. Bruce Fields10326.89%28.00%


Linus Torvalds10126.37%14.00%


Linus Torvalds (pre-git)8321.67%416.00%


Neil Brown287.31%728.00%


Christoph Hellwig205.22%28.00%


Al Viro143.66%312.00%


David Howells123.13%14.00%


Kendrick M. Smith112.87%14.00%


Jan Blunck61.57%14.00%


Andrew Morton30.78%14.00%


Namjae Jeon10.26%14.00%


Kinglong Mee10.26%14.00%


Total383100.00%25100.00%



/*
 * Update file handle information after changing a dentry.
 * This is only called by nfsd_create, nfsd_create_v3 and nfsd_proc_create
 */


__be32

fh_update(struct svc_fh *fhp)
{
	struct dentry *dentry;

	if (!fhp->fh_dentry)
		goto out_bad;

	dentry = fhp->fh_dentry;
	if (d_really_is_negative(dentry))
		goto out_negative;
	if (fhp->fh_handle.fh_version != 1) {
		_fh_update_old(dentry, fhp->fh_export, &fhp->fh_handle);
	} else {
		if (fhp->fh_handle.fh_fileid_type != FILEID_ROOT)
			return 0;

		_fh_update(fhp, fhp->fh_export, dentry);
		if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID)
			return nfserr_opnotsupp;
	}
	return 0;
out_bad:
	printk(KERN_ERR "fh_update: fh not verified!\n");
	return nfserr_serverfault;
out_negative:
	printk(KERN_ERR "fh_update: %pd2 still negative!\n",
		dentry);
	return nfserr_serverfault;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)7253.73%640.00%


Linus Torvalds3223.88%213.33%


Neil Brown128.96%16.67%


J. Bruce Fields96.72%16.67%


David Howells32.24%16.67%


Christoph Hellwig32.24%16.67%


Al Viro21.49%213.33%


Namjae Jeon10.75%16.67%


Total134100.00%15100.00%



/*
 * Release a file handle.
 */


void

fh_put(struct svc_fh *fhp)
{
	struct dentry * dentry = fhp->fh_dentry;
	struct svc_export * exp = fhp->fh_export;
	if (dentry) {
		fh_unlock(fhp);
		fhp->fh_dentry = NULL;
		dput(dentry);
		fh_clear_wcc(fhp);
	}
	fh_drop_write(fhp);
	if (exp) {
		exp_put(exp);
		fhp->fh_export = NULL;
	}
	return;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)4253.85%758.33%


Neil Brown2532.05%18.33%


Jan Kara56.41%18.33%


Jeff Layton33.85%18.33%


Kendrick M. Smith22.56%18.33%


Stanislav Kinsbursky11.28%18.33%


Total78100.00%12100.00%



/*
 * Shorthand for dprintk()'s
 */



char * SVCFH_fmt(struct svc_fh *fhp)
{
	struct knfsd_fh *fh = &fhp->fh_handle;

	static char buf[80];
	sprintf(buf, "%d: %08x %08x %08x %08x %08x %08x",
		fh->fh_size,
		fh->fh_base.fh_pad[0],
		fh->fh_base.fh_pad[1],
		fh->fh_base.fh_pad[2],
		fh->fh_base.fh_pad[3],
		fh->fh_base.fh_pad[4],
		fh->fh_base.fh_pad[5]);
	return buf;
}


Contributors
PersonTokensPropCommitsCommitProp
Andrew Morton96100.00%1100.00%


Total96100.00%1100.00%






enum fsid_source fsid_source(struct svc_fh *fhp)
{
	if (fhp->fh_handle.fh_version != 1)
		return FSIDSOURCE_DEV;
	switch(fhp->fh_handle.fh_fsid_type) {
	case FSID_DEV:
	case FSID_ENCODE_DEV:
	case FSID_MAJOR_MINOR:
		if (exp_sb(fhp->fh_export)->s_type->fs_flags & FS_REQUIRES_DEV)
			return FSIDSOURCE_DEV;
		break;
	case FSID_NUM:
		if (fhp->fh_export->ex_flags & NFSEXP_FSID)
			return FSIDSOURCE_FSID;
		break;
	default:
		break;
	}
	/* either a UUID type filehandle, or the filehandle doesn't
         * match the export.
         */
	if (fhp->fh_export->ex_flags & NFSEXP_FSID)
		return FSIDSOURCE_FSID;
	if (fhp->fh_export->ex_uuid)
		return FSIDSOURCE_UUID;
	return FSIDSOURCE_DEV;
}

Contributors
PersonTokensPropCommitsCommitProp
Neil Brown10697.25%266.67%


J. Bruce Fields32.75%133.33%


Total109100.00%3100.00%




Overall Contributors
PersonTokensPropCommitsCommitProp
Neil Brown72626.39%2019.23%


J. Bruce Fields65023.63%2322.12%


Linus Torvalds (pre-git)50718.43%1312.50%


Linus Torvalds2127.71%65.77%


Christoph Hellwig1656.00%43.85%


Steve Dickson1204.36%21.92%


Andrew Morton1013.67%32.88%


Al Viro722.62%98.65%


David Howells662.40%43.85%


Kendrick M. Smith391.42%54.81%


Jan Blunck240.87%10.96%


Jeff Layton190.69%32.88%


Andy Adamson190.69%10.96%


Kinglong Mee90.33%21.92%


Bruce W Allan60.22%10.96%


Pavel Emelyanov50.18%10.96%


Jan Kara50.18%10.96%


Namjae Jeon20.07%10.96%


Miklos Szeredi10.04%10.96%


Oleg Drokin10.04%10.96%


Boaz Harrosh10.04%10.96%


Stanislav Kinsbursky10.04%10.96%


Total2751100.00%104100.00%


Directory: fs/nfsd



Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.