forked from Minki/linux
a87e84b5cd
* 'for-2.6.32' of git://linux-nfs.org/~bfields/linux: (68 commits) nfsd4: nfsv4 clients should cross mountpoints nfsd: revise 4.1 status documentation sunrpc/cache: avoid variable over-loading in cache_defer_req sunrpc/cache: use list_del_init for the list_head entries in cache_deferred_req nfsd: return success for non-NFS4 nfs4_state_start nfsd41: Refactor create_client() nfsd41: modify nfsd4.1 backchannel to use new xprt class nfsd41: Backchannel: Implement cb_recall over NFSv4.1 nfsd41: Backchannel: cb_sequence callback nfsd41: Backchannel: Setup sequence information nfsd41: Backchannel: Server backchannel RPC wait queue nfsd41: Backchannel: Add sequence arguments to callback RPC arguments nfsd41: Backchannel: callback infrastructure nfsd4: use common rpc_cred for all callbacks nfsd4: allow nfs4 state startup to fail SUNRPC: Defer the auth_gss upcall when the RPC call is asynchronous nfsd4: fix null dereference creating nfsv4 callback client nfsd4: fix whitespace in NFSPROC4_CLNT_CB_NULL definition nfsd41: sunrpc: add new xprt class for nfsv4.1 backchannel sunrpc/cache: simplify cache_fresh_locked and cache_fresh_unlocked. ...
2283 lines
54 KiB
C
2283 lines
54 KiB
C
#define MSNFS /* HACK HACK */
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/*
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* linux/fs/nfsd/vfs.c
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*
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* File operations used by nfsd. Some of these have been ripped from
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* other parts of the kernel because they weren't exported, others
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* are partial duplicates with added or changed functionality.
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*
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* Note that several functions dget() the dentry upon which they want
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* to act, most notably those that create directory entries. Response
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* dentry's are dput()'d if necessary in the release callback.
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* So if you notice code paths that apparently fail to dput() the
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* dentry, don't worry--they have been taken care of.
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*
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* Copyright (C) 1995-1999 Olaf Kirch <okir@monad.swb.de>
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* Zerocpy NFS support (C) 2002 Hirokazu Takahashi <taka@valinux.co.jp>
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*/
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#include <linux/string.h>
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#include <linux/time.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/file.h>
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#include <linux/mount.h>
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#include <linux/major.h>
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#include <linux/splice.h>
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#include <linux/proc_fs.h>
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#include <linux/stat.h>
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#include <linux/fcntl.h>
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#include <linux/net.h>
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#include <linux/unistd.h>
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#include <linux/slab.h>
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#include <linux/pagemap.h>
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#include <linux/in.h>
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#include <linux/module.h>
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#include <linux/namei.h>
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#include <linux/vfs.h>
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#include <linux/delay.h>
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#include <linux/sunrpc/svc.h>
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#include <linux/nfsd/nfsd.h>
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#ifdef CONFIG_NFSD_V3
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#include <linux/nfs3.h>
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#include <linux/nfsd/xdr3.h>
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#endif /* CONFIG_NFSD_V3 */
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#include <linux/nfsd/nfsfh.h>
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#include <linux/quotaops.h>
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#include <linux/fsnotify.h>
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#include <linux/posix_acl.h>
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#include <linux/posix_acl_xattr.h>
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#include <linux/xattr.h>
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#ifdef CONFIG_NFSD_V4
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#include <linux/nfs4.h>
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#include <linux/nfs4_acl.h>
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#include <linux/nfsd_idmap.h>
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#include <linux/security.h>
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#endif /* CONFIG_NFSD_V4 */
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#include <linux/jhash.h>
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#include <linux/ima.h>
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#include <asm/uaccess.h>
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#define NFSDDBG_FACILITY NFSDDBG_FILEOP
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/*
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* This is a cache of readahead params that help us choose the proper
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* readahead strategy. Initially, we set all readahead parameters to 0
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* and let the VFS handle things.
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* If you increase the number of cached files very much, you'll need to
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* add a hash table here.
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*/
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struct raparms {
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struct raparms *p_next;
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unsigned int p_count;
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ino_t p_ino;
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dev_t p_dev;
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int p_set;
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struct file_ra_state p_ra;
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unsigned int p_hindex;
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};
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struct raparm_hbucket {
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struct raparms *pb_head;
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spinlock_t pb_lock;
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} ____cacheline_aligned_in_smp;
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#define RAPARM_HASH_BITS 4
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#define RAPARM_HASH_SIZE (1<<RAPARM_HASH_BITS)
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#define RAPARM_HASH_MASK (RAPARM_HASH_SIZE-1)
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static struct raparm_hbucket raparm_hash[RAPARM_HASH_SIZE];
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static inline int
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nfsd_v4client(struct svc_rqst *rq)
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{
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return rq->rq_prog == NFS_PROGRAM && rq->rq_vers == 4;
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}
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/*
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* Called from nfsd_lookup and encode_dirent. Check if we have crossed
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* a mount point.
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* Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged,
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* or nfs_ok having possibly changed *dpp and *expp
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*/
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int
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nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp,
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struct svc_export **expp)
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{
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struct svc_export *exp = *expp, *exp2 = NULL;
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struct dentry *dentry = *dpp;
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struct path path = {.mnt = mntget(exp->ex_path.mnt),
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.dentry = dget(dentry)};
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int err = 0;
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while (d_mountpoint(path.dentry) && follow_down(&path))
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;
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exp2 = rqst_exp_get_by_name(rqstp, &path);
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if (IS_ERR(exp2)) {
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if (PTR_ERR(exp2) != -ENOENT)
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err = PTR_ERR(exp2);
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path_put(&path);
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goto out;
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}
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if (nfsd_v4client(rqstp) ||
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(exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) {
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/* successfully crossed mount point */
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/*
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* This is subtle: path.dentry is *not* on path.mnt
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* at this point. The only reason we are safe is that
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* original mnt is pinned down by exp, so we should
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* put path *before* putting exp
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*/
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*dpp = path.dentry;
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path.dentry = dentry;
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*expp = exp2;
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exp2 = exp;
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}
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path_put(&path);
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exp_put(exp2);
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out:
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return err;
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}
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__be32
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nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp,
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const char *name, unsigned int len,
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struct svc_export **exp_ret, struct dentry **dentry_ret)
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{
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struct svc_export *exp;
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struct dentry *dparent;
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struct dentry *dentry;
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__be32 err;
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int host_err;
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dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name);
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/* Obtain dentry and export. */
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err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC);
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if (err)
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return err;
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dparent = fhp->fh_dentry;
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exp = fhp->fh_export;
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exp_get(exp);
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/* Lookup the name, but don't follow links */
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if (isdotent(name, len)) {
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if (len==1)
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dentry = dget(dparent);
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else if (dparent != exp->ex_path.dentry)
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dentry = dget_parent(dparent);
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else if (!EX_NOHIDE(exp))
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dentry = dget(dparent); /* .. == . just like at / */
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else {
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/* checking mountpoint crossing is very different when stepping up */
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struct svc_export *exp2 = NULL;
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struct dentry *dp;
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struct path path = {.mnt = mntget(exp->ex_path.mnt),
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.dentry = dget(dparent)};
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while (path.dentry == path.mnt->mnt_root &&
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follow_up(&path))
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;
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dp = dget_parent(path.dentry);
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dput(path.dentry);
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path.dentry = dp;
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exp2 = rqst_exp_parent(rqstp, &path);
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if (PTR_ERR(exp2) == -ENOENT) {
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dentry = dget(dparent);
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} else if (IS_ERR(exp2)) {
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host_err = PTR_ERR(exp2);
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path_put(&path);
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goto out_nfserr;
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} else {
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dentry = dget(path.dentry);
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exp_put(exp);
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exp = exp2;
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}
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path_put(&path);
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}
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} else {
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fh_lock(fhp);
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dentry = lookup_one_len(name, dparent, len);
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host_err = PTR_ERR(dentry);
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if (IS_ERR(dentry))
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goto out_nfserr;
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/*
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* check if we have crossed a mount point ...
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*/
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if (d_mountpoint(dentry)) {
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if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) {
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dput(dentry);
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goto out_nfserr;
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}
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}
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}
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*dentry_ret = dentry;
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*exp_ret = exp;
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return 0;
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out_nfserr:
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exp_put(exp);
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return nfserrno(host_err);
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}
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/*
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* Look up one component of a pathname.
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* N.B. After this call _both_ fhp and resfh need an fh_put
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*
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* If the lookup would cross a mountpoint, and the mounted filesystem
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* is exported to the client with NFSEXP_NOHIDE, then the lookup is
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* accepted as it stands and the mounted directory is
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* returned. Otherwise the covered directory is returned.
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* NOTE: this mountpoint crossing is not supported properly by all
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* clients and is explicitly disallowed for NFSv3
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* NeilBrown <neilb@cse.unsw.edu.au>
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*/
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__be32
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nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name,
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unsigned int len, struct svc_fh *resfh)
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{
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struct svc_export *exp;
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struct dentry *dentry;
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__be32 err;
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err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry);
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if (err)
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return err;
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err = check_nfsd_access(exp, rqstp);
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if (err)
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goto out;
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/*
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* Note: we compose the file handle now, but as the
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* dentry may be negative, it may need to be updated.
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*/
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err = fh_compose(resfh, exp, dentry, fhp);
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if (!err && !dentry->d_inode)
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err = nfserr_noent;
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out:
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dput(dentry);
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exp_put(exp);
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return err;
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}
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/*
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* Set various file attributes.
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* N.B. After this call fhp needs an fh_put
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*/
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__be32
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nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap,
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int check_guard, time_t guardtime)
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{
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struct dentry *dentry;
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struct inode *inode;
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int accmode = NFSD_MAY_SATTR;
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int ftype = 0;
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__be32 err;
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int host_err;
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int size_change = 0;
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if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE))
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accmode |= NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE;
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if (iap->ia_valid & ATTR_SIZE)
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ftype = S_IFREG;
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/* Get inode */
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err = fh_verify(rqstp, fhp, ftype, accmode);
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if (err)
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goto out;
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dentry = fhp->fh_dentry;
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inode = dentry->d_inode;
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/* Ignore any mode updates on symlinks */
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if (S_ISLNK(inode->i_mode))
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iap->ia_valid &= ~ATTR_MODE;
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if (!iap->ia_valid)
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goto out;
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|
|
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/*
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* NFSv2 does not differentiate between "set-[ac]time-to-now"
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* which only requires access, and "set-[ac]time-to-X" which
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* requires ownership.
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* So if it looks like it might be "set both to the same time which
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* is close to now", and if inode_change_ok fails, then we
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* convert to "set to now" instead of "set to explicit time"
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*
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* We only call inode_change_ok as the last test as technically
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* it is not an interface that we should be using. It is only
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* valid if the filesystem does not define it's own i_op->setattr.
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*/
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#define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
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#define MAX_TOUCH_TIME_ERROR (30*60)
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if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET &&
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iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) {
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/*
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* Looks probable.
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*
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* Now just make sure time is in the right ballpark.
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* Solaris, at least, doesn't seem to care what the time
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* request is. We require it be within 30 minutes of now.
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*/
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time_t delta = iap->ia_atime.tv_sec - get_seconds();
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if (delta < 0)
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delta = -delta;
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if (delta < MAX_TOUCH_TIME_ERROR &&
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inode_change_ok(inode, iap) != 0) {
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/*
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* Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME.
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* This will cause notify_change to set these times
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* to "now"
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*/
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iap->ia_valid &= ~BOTH_TIME_SET;
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}
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}
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|
|
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/*
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* The size case is special.
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* It changes the file as well as the attributes.
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*/
|
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if (iap->ia_valid & ATTR_SIZE) {
|
|
if (iap->ia_size < inode->i_size) {
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err = nfsd_permission(rqstp, fhp->fh_export, dentry,
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NFSD_MAY_TRUNC|NFSD_MAY_OWNER_OVERRIDE);
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|
if (err)
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goto out;
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|
}
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|
|
|
/*
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|
* If we are changing the size of the file, then
|
|
* we need to break all leases.
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|
*/
|
|
host_err = break_lease(inode, FMODE_WRITE | O_NONBLOCK);
|
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if (host_err == -EWOULDBLOCK)
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host_err = -ETIMEDOUT;
|
|
if (host_err) /* ENOMEM or EWOULDBLOCK */
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goto out_nfserr;
|
|
|
|
host_err = get_write_access(inode);
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|
if (host_err)
|
|
goto out_nfserr;
|
|
|
|
size_change = 1;
|
|
host_err = locks_verify_truncate(inode, NULL, iap->ia_size);
|
|
if (host_err) {
|
|
put_write_access(inode);
|
|
goto out_nfserr;
|
|
}
|
|
vfs_dq_init(inode);
|
|
}
|
|
|
|
/* 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_uid != inode->i_uid) ||
|
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((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_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);
|
|
}
|
|
}
|
|
|
|
/* Change the attributes. */
|
|
|
|
iap->ia_valid |= ATTR_CTIME;
|
|
|
|
err = nfserr_notsync;
|
|
if (!check_guard || guardtime == inode->i_ctime.tv_sec) {
|
|
fh_lock(fhp);
|
|
host_err = notify_change(dentry, iap);
|
|
err = nfserrno(host_err);
|
|
fh_unlock(fhp);
|
|
}
|
|
if (size_change)
|
|
put_write_access(inode);
|
|
if (!err)
|
|
if (EX_ISSYNC(fhp->fh_export))
|
|
write_inode_now(inode, 1);
|
|
out:
|
|
return err;
|
|
|
|
out_nfserr:
|
|
err = nfserrno(host_err);
|
|
goto out;
|
|
}
|
|
|
|
#if defined(CONFIG_NFSD_V2_ACL) || \
|
|
defined(CONFIG_NFSD_V3_ACL) || \
|
|
defined(CONFIG_NFSD_V4)
|
|
static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf)
|
|
{
|
|
ssize_t buflen;
|
|
ssize_t ret;
|
|
|
|
buflen = vfs_getxattr(dentry, key, NULL, 0);
|
|
if (buflen <= 0)
|
|
return buflen;
|
|
|
|
*buf = kmalloc(buflen, GFP_KERNEL);
|
|
if (!*buf)
|
|
return -ENOMEM;
|
|
|
|
ret = vfs_getxattr(dentry, key, *buf, buflen);
|
|
if (ret < 0)
|
|
kfree(*buf);
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
#if defined(CONFIG_NFSD_V4)
|
|
static int
|
|
set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key)
|
|
{
|
|
int len;
|
|
size_t buflen;
|
|
char *buf = NULL;
|
|
int error = 0;
|
|
|
|
buflen = posix_acl_xattr_size(pacl->a_count);
|
|
buf = kmalloc(buflen, GFP_KERNEL);
|
|
error = -ENOMEM;
|
|
if (buf == NULL)
|
|
goto out;
|
|
|
|
len = posix_acl_to_xattr(pacl, buf, buflen);
|
|
if (len < 0) {
|
|
error = len;
|
|
goto out;
|
|
}
|
|
|
|
error = vfs_setxattr(dentry, key, buf, len, 0);
|
|
out:
|
|
kfree(buf);
|
|
return error;
|
|
}
|
|
|
|
__be32
|
|
nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
|
|
struct nfs4_acl *acl)
|
|
{
|
|
__be32 error;
|
|
int host_error;
|
|
struct dentry *dentry;
|
|
struct inode *inode;
|
|
struct posix_acl *pacl = NULL, *dpacl = NULL;
|
|
unsigned int flags = 0;
|
|
|
|
/* Get inode */
|
|
error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, NFSD_MAY_SATTR);
|
|
if (error)
|
|
return error;
|
|
|
|
dentry = fhp->fh_dentry;
|
|
inode = dentry->d_inode;
|
|
if (S_ISDIR(inode->i_mode))
|
|
flags = NFS4_ACL_DIR;
|
|
|
|
host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags);
|
|
if (host_error == -EINVAL) {
|
|
return nfserr_attrnotsupp;
|
|
} else if (host_error < 0)
|
|
goto out_nfserr;
|
|
|
|
host_error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS);
|
|
if (host_error < 0)
|
|
goto out_release;
|
|
|
|
if (S_ISDIR(inode->i_mode))
|
|
host_error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT);
|
|
|
|
out_release:
|
|
posix_acl_release(pacl);
|
|
posix_acl_release(dpacl);
|
|
out_nfserr:
|
|
if (host_error == -EOPNOTSUPP)
|
|
return nfserr_attrnotsupp;
|
|
else
|
|
return nfserrno(host_error);
|
|
}
|
|
|
|
static struct posix_acl *
|
|
_get_posix_acl(struct dentry *dentry, char *key)
|
|
{
|
|
void *buf = NULL;
|
|
struct posix_acl *pacl = NULL;
|
|
int buflen;
|
|
|
|
buflen = nfsd_getxattr(dentry, key, &buf);
|
|
if (!buflen)
|
|
buflen = -ENODATA;
|
|
if (buflen <= 0)
|
|
return ERR_PTR(buflen);
|
|
|
|
pacl = posix_acl_from_xattr(buf, buflen);
|
|
kfree(buf);
|
|
return pacl;
|
|
}
|
|
|
|
int
|
|
nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
int error = 0;
|
|
struct posix_acl *pacl = NULL, *dpacl = NULL;
|
|
unsigned int flags = 0;
|
|
|
|
pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS);
|
|
if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA)
|
|
pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
|
|
if (IS_ERR(pacl)) {
|
|
error = PTR_ERR(pacl);
|
|
pacl = NULL;
|
|
goto out;
|
|
}
|
|
|
|
if (S_ISDIR(inode->i_mode)) {
|
|
dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT);
|
|
if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA)
|
|
dpacl = NULL;
|
|
else if (IS_ERR(dpacl)) {
|
|
error = PTR_ERR(dpacl);
|
|
dpacl = NULL;
|
|
goto out;
|
|
}
|
|
flags = NFS4_ACL_DIR;
|
|
}
|
|
|
|
*acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags);
|
|
if (IS_ERR(*acl)) {
|
|
error = PTR_ERR(*acl);
|
|
*acl = NULL;
|
|
}
|
|
out:
|
|
posix_acl_release(pacl);
|
|
posix_acl_release(dpacl);
|
|
return error;
|
|
}
|
|
|
|
#endif /* defined(CONFIG_NFS_V4) */
|
|
|
|
#ifdef CONFIG_NFSD_V3
|
|
/*
|
|
* Check server access rights to a file system object
|
|
*/
|
|
struct accessmap {
|
|
u32 access;
|
|
int how;
|
|
};
|
|
static struct accessmap nfs3_regaccess[] = {
|
|
{ NFS3_ACCESS_READ, 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 (S_ISREG(dentry->d_inode->i_mode))
|
|
map = nfs3_regaccess;
|
|
else if (S_ISDIR(dentry->d_inode->i_mode))
|
|
map = nfs3_diraccess;
|
|
else
|
|
map = nfs3_anyaccess;
|
|
|
|
|
|
query = *access;
|
|
for (; map->access; map++) {
|
|
if (map->access & query) {
|
|
__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;
|
|
}
|
|
#endif /* CONFIG_NFSD_V3 */
|
|
|
|
|
|
|
|
/*
|
|
* Open an existing file or directory.
|
|
* The access argument indicates the type of open (read/write/lock)
|
|
* N.B. After this call fhp needs an fh_put
|
|
*/
|
|
__be32
|
|
nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
|
|
int access, struct file **filp)
|
|
{
|
|
struct dentry *dentry;
|
|
struct inode *inode;
|
|
int flags = O_RDONLY|O_LARGEFILE;
|
|
__be32 err;
|
|
int host_err;
|
|
|
|
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.
|
|
*/
|
|
err = fh_verify(rqstp, fhp, type, access | NFSD_MAY_OWNER_OVERRIDE);
|
|
if (err)
|
|
goto out;
|
|
|
|
dentry = fhp->fh_dentry;
|
|
inode = dentry->d_inode;
|
|
|
|
/* Disallow write access to files with the append-only bit set
|
|
* or any access when mandatory locking enabled
|
|
*/
|
|
err = nfserr_perm;
|
|
if (IS_APPEND(inode) && (access & 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;
|
|
|
|
/*
|
|
* Check to see if there are any leases on this file.
|
|
* This may block while leases are broken.
|
|
*/
|
|
host_err = break_lease(inode, O_NONBLOCK | ((access & NFSD_MAY_WRITE) ? FMODE_WRITE : 0));
|
|
if (host_err == -EWOULDBLOCK)
|
|
host_err = -ETIMEDOUT;
|
|
if (host_err) /* NOMEM or WOULDBLOCK */
|
|
goto out_nfserr;
|
|
|
|
if (access & NFSD_MAY_WRITE) {
|
|
if (access & NFSD_MAY_READ)
|
|
flags = O_RDWR|O_LARGEFILE;
|
|
else
|
|
flags = O_WRONLY|O_LARGEFILE;
|
|
|
|
vfs_dq_init(inode);
|
|
}
|
|
*filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_path.mnt),
|
|
flags, current_cred());
|
|
if (IS_ERR(*filp))
|
|
host_err = PTR_ERR(*filp);
|
|
else
|
|
ima_counts_get(*filp);
|
|
out_nfserr:
|
|
err = nfserrno(host_err);
|
|
out:
|
|
validate_process_creds();
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Close a file.
|
|
*/
|
|
void
|
|
nfsd_close(struct file *filp)
|
|
{
|
|
fput(filp);
|
|
}
|
|
|
|
/*
|
|
* Sync a file
|
|
* As this calls fsync (not fdatasync) there is no need for a write_inode
|
|
* after it.
|
|
*/
|
|
static inline int nfsd_dosync(struct file *filp, struct dentry *dp,
|
|
const struct file_operations *fop)
|
|
{
|
|
struct inode *inode = dp->d_inode;
|
|
int (*fsync) (struct file *, struct dentry *, int);
|
|
int err;
|
|
|
|
err = filemap_fdatawrite(inode->i_mapping);
|
|
if (err == 0 && fop && (fsync = fop->fsync))
|
|
err = fsync(filp, dp, 0);
|
|
if (err == 0)
|
|
err = filemap_fdatawait(inode->i_mapping);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
nfsd_sync(struct file *filp)
|
|
{
|
|
int err;
|
|
struct inode *inode = filp->f_path.dentry->d_inode;
|
|
dprintk("nfsd: sync file %s\n", filp->f_path.dentry->d_name.name);
|
|
mutex_lock(&inode->i_mutex);
|
|
err=nfsd_dosync(filp, filp->f_path.dentry, filp->f_op);
|
|
mutex_unlock(&inode->i_mutex);
|
|
|
|
return err;
|
|
}
|
|
|
|
int
|
|
nfsd_sync_dir(struct dentry *dp)
|
|
{
|
|
return nfsd_dosync(NULL, dp, dp->d_inode->i_fop);
|
|
}
|
|
|
|
/*
|
|
* Obtain the readahead parameters for the file
|
|
* specified by (dev, ino).
|
|
*/
|
|
|
|
static inline struct raparms *
|
|
nfsd_get_raparms(dev_t dev, ino_t ino)
|
|
{
|
|
struct raparms *ra, **rap, **frap = NULL;
|
|
int depth = 0;
|
|
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*11/10;
|
|
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);
|
|
return ra;
|
|
}
|
|
|
|
/*
|
|
* 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_respages + rqstp->rq_resused;
|
|
struct page *page = buf->page;
|
|
size_t size;
|
|
int ret;
|
|
|
|
ret = buf->ops->confirm(pipe, buf);
|
|
if (unlikely(ret))
|
|
return ret;
|
|
|
|
size = sd->len;
|
|
|
|
if (rqstp->rq_res.page_len == 0) {
|
|
get_page(page);
|
|
put_page(*pp);
|
|
*pp = page;
|
|
rqstp->rq_resused++;
|
|
rqstp->rq_res.page_base = buf->offset;
|
|
rqstp->rq_res.page_len = size;
|
|
} else if (page != pp[-1]) {
|
|
get_page(page);
|
|
if (*pp)
|
|
put_page(*pp);
|
|
*pp = page;
|
|
rqstp->rq_resused++;
|
|
rqstp->rq_res.page_len += size;
|
|
} else
|
|
rqstp->rq_res.page_len += size;
|
|
|
|
return size;
|
|
}
|
|
|
|
static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe,
|
|
struct splice_desc *sd)
|
|
{
|
|
return __splice_from_pipe(pipe, sd, nfsd_splice_actor);
|
|
}
|
|
|
|
static inline int svc_msnfs(struct svc_fh *ffhp)
|
|
{
|
|
#ifdef MSNFS
|
|
return (ffhp->fh_export->ex_flags & NFSEXP_MSNFS);
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
static __be32
|
|
nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
|
|
loff_t offset, struct kvec *vec, int vlen, unsigned long *count)
|
|
{
|
|
struct inode *inode;
|
|
struct raparms *ra;
|
|
mm_segment_t oldfs;
|
|
__be32 err;
|
|
int host_err;
|
|
|
|
err = nfserr_perm;
|
|
inode = file->f_path.dentry->d_inode;
|
|
|
|
if (svc_msnfs(fhp) && !lock_may_read(inode, offset, *count))
|
|
goto out;
|
|
|
|
/* Get readahead parameters */
|
|
ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino);
|
|
|
|
if (ra && ra->p_set)
|
|
file->f_ra = ra->p_ra;
|
|
|
|
if (file->f_op->splice_read && rqstp->rq_splice_ok) {
|
|
struct splice_desc sd = {
|
|
.len = 0,
|
|
.total_len = *count,
|
|
.pos = offset,
|
|
.u.data = rqstp,
|
|
};
|
|
|
|
rqstp->rq_resused = 1;
|
|
host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor);
|
|
} else {
|
|
oldfs = get_fs();
|
|
set_fs(KERNEL_DS);
|
|
host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset);
|
|
set_fs(oldfs);
|
|
}
|
|
|
|
/* Write back readahead params */
|
|
if (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);
|
|
}
|
|
|
|
if (host_err >= 0) {
|
|
nfsdstats.io_read += host_err;
|
|
*count = host_err;
|
|
err = 0;
|
|
fsnotify_access(file->f_path.dentry);
|
|
} else
|
|
err = nfserrno(host_err);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static void kill_suid(struct dentry *dentry)
|
|
{
|
|
struct iattr ia;
|
|
ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV;
|
|
|
|
mutex_lock(&dentry->d_inode->i_mutex);
|
|
notify_change(dentry, &ia);
|
|
mutex_unlock(&dentry->d_inode->i_mutex);
|
|
}
|
|
|
|
/*
|
|
* 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->f_path.dentry->d_inode;
|
|
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 = nfsd_sync(file);
|
|
}
|
|
last_ino = inode->i_ino;
|
|
last_dev = inode->i_sb->s_dev;
|
|
return err;
|
|
}
|
|
|
|
static __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 dentry *dentry;
|
|
struct inode *inode;
|
|
mm_segment_t oldfs;
|
|
__be32 err = 0;
|
|
int host_err;
|
|
int stable = *stablep;
|
|
int use_wgather;
|
|
|
|
#ifdef MSNFS
|
|
err = nfserr_perm;
|
|
|
|
if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
|
|
(!lock_may_write(file->f_path.dentry->d_inode, offset, *cnt)))
|
|
goto out;
|
|
#endif
|
|
|
|
dentry = file->f_path.dentry;
|
|
inode = dentry->d_inode;
|
|
exp = fhp->fh_export;
|
|
|
|
/*
|
|
* Request sync writes if
|
|
* - the sync export option has been set, or
|
|
* - the client requested O_SYNC behavior (NFSv3 feature).
|
|
* - The file system doesn't support fsync().
|
|
* When NFSv2 gathered writes have been configured for this volume,
|
|
* flushing the data to disk is handled separately below.
|
|
*/
|
|
use_wgather = (rqstp->rq_vers == 2) && EX_WGATHER(exp);
|
|
|
|
if (!file->f_op->fsync) {/* COMMIT3 cannot work */
|
|
stable = 2;
|
|
*stablep = 2; /* FILE_SYNC */
|
|
}
|
|
|
|
if (!EX_ISSYNC(exp))
|
|
stable = 0;
|
|
if (stable && !use_wgather) {
|
|
spin_lock(&file->f_lock);
|
|
file->f_flags |= O_SYNC;
|
|
spin_unlock(&file->f_lock);
|
|
}
|
|
|
|
/* Write the data. */
|
|
oldfs = get_fs(); set_fs(KERNEL_DS);
|
|
host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset);
|
|
set_fs(oldfs);
|
|
if (host_err < 0)
|
|
goto out_nfserr;
|
|
*cnt = host_err;
|
|
nfsdstats.io_write += host_err;
|
|
fsnotify_modify(file->f_path.dentry);
|
|
|
|
/* clear setuid/setgid flag after write */
|
|
if (inode->i_mode & (S_ISUID | S_ISGID))
|
|
kill_suid(dentry);
|
|
|
|
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);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Read data from a file. count must contain the requested read count
|
|
* on entry. On return, *count contains the number of bytes actually read.
|
|
* N.B. After this call fhp needs an fh_put
|
|
*/
|
|
__be32
|
|
nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
|
|
loff_t offset, struct kvec *vec, int vlen,
|
|
unsigned long *count)
|
|
{
|
|
__be32 err;
|
|
|
|
if (file) {
|
|
err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
|
|
NFSD_MAY_READ|NFSD_MAY_OWNER_OVERRIDE);
|
|
if (err)
|
|
goto out;
|
|
err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count);
|
|
} else {
|
|
err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
|
|
if (err)
|
|
goto out;
|
|
err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count);
|
|
nfsd_close(file);
|
|
}
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Write data to a file.
|
|
* The stable flag requests synchronous writes.
|
|
* N.B. After this call fhp needs an fh_put
|
|
*/
|
|
__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;
|
|
|
|
if (file) {
|
|
err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
|
|
NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE);
|
|
if (err)
|
|
goto out;
|
|
err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt,
|
|
stablep);
|
|
} else {
|
|
err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file);
|
|
if (err)
|
|
goto out;
|
|
|
|
if (cnt)
|
|
err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen,
|
|
cnt, stablep);
|
|
nfsd_close(file);
|
|
}
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
#ifdef CONFIG_NFSD_V3
|
|
/*
|
|
* Commit all pending writes to stable storage.
|
|
* Strictly speaking, we could sync just the indicated file region here,
|
|
* but there's currently no way we can ask the VFS to do so.
|
|
*
|
|
* Unfortunately we cannot lock the file to make sure we return full WCC
|
|
* data to the client, as locking happens lower down in the filesystem.
|
|
*/
|
|
__be32
|
|
nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp,
|
|
loff_t offset, unsigned long count)
|
|
{
|
|
struct file *file;
|
|
__be32 err;
|
|
|
|
if ((u64)count > ~(u64)offset)
|
|
return nfserr_inval;
|
|
|
|
err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file);
|
|
if (err)
|
|
return err;
|
|
if (EX_ISSYNC(fhp->fh_export)) {
|
|
if (file->f_op && file->f_op->fsync) {
|
|
err = nfserrno(nfsd_sync(file));
|
|
} else {
|
|
err = nfserr_notsupp;
|
|
}
|
|
}
|
|
|
|
nfsd_close(file);
|
|
return err;
|
|
}
|
|
#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 (current_fsuid() != 0)
|
|
iap->ia_valid &= ~(ATTR_UID|ATTR_GID);
|
|
if (iap->ia_valid)
|
|
return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0);
|
|
return 0;
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/*
|
|
* Create a file (regular, directory, device, fifo); UNIX sockets
|
|
* not yet implemented.
|
|
* If the response fh has been verified, the parent directory should
|
|
* already be locked. Note that the parent directory is left locked.
|
|
*
|
|
* N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp
|
|
*/
|
|
__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;
|
|
__be32 err2;
|
|
int host_err;
|
|
|
|
err = nfserr_perm;
|
|
if (!flen)
|
|
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;
|
|
|
|
dentry = fhp->fh_dentry;
|
|
dirp = dentry->d_inode;
|
|
|
|
err = nfserr_notdir;
|
|
if (!dirp->i_op->lookup)
|
|
goto out;
|
|
/*
|
|
* Check whether the response file handle has been verified yet.
|
|
* If it has, the parent directory should already be locked.
|
|
*/
|
|
if (!resfhp->fh_dentry) {
|
|
/* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */
|
|
fh_lock_nested(fhp, I_MUTEX_PARENT);
|
|
dchild = lookup_one_len(fname, dentry, flen);
|
|
host_err = PTR_ERR(dchild);
|
|
if (IS_ERR(dchild))
|
|
goto out_nfserr;
|
|
err = fh_compose(resfhp, fhp->fh_export, dchild, fhp);
|
|
if (err)
|
|
goto out;
|
|
} else {
|
|
/* called from nfsd_proc_create */
|
|
dchild = dget(resfhp->fh_dentry);
|
|
if (!fhp->fh_locked) {
|
|
/* not actually possible */
|
|
printk(KERN_ERR
|
|
"nfsd_create: parent %s/%s not locked!\n",
|
|
dentry->d_parent->d_name.name,
|
|
dentry->d_name.name);
|
|
err = nfserr_io;
|
|
goto out;
|
|
}
|
|
}
|
|
/*
|
|
* Make sure the child dentry is still negative ...
|
|
*/
|
|
err = nfserr_exist;
|
|
if (dchild->d_inode) {
|
|
dprintk("nfsd_create: dentry %s/%s not negative!\n",
|
|
dentry->d_name.name, dchild->d_name.name);
|
|
goto out;
|
|
}
|
|
|
|
if (!(iap->ia_valid & ATTR_MODE))
|
|
iap->ia_mode = 0;
|
|
iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type;
|
|
|
|
err = nfserr_inval;
|
|
if (!S_ISREG(type) && !S_ISDIR(type) && !special_file(type)) {
|
|
printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n",
|
|
type);
|
|
goto out;
|
|
}
|
|
|
|
host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
|
|
if (host_err)
|
|
goto out_nfserr;
|
|
|
|
/*
|
|
* Get the dir op function pointer.
|
|
*/
|
|
err = 0;
|
|
switch (type) {
|
|
case S_IFREG:
|
|
host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
|
|
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;
|
|
}
|
|
if (host_err < 0) {
|
|
mnt_drop_write(fhp->fh_export->ex_path.mnt);
|
|
goto out_nfserr;
|
|
}
|
|
|
|
if (EX_ISSYNC(fhp->fh_export)) {
|
|
err = nfserrno(nfsd_sync_dir(dentry));
|
|
write_inode_now(dchild->d_inode, 1);
|
|
}
|
|
|
|
err2 = nfsd_create_setattr(rqstp, resfhp, iap);
|
|
if (err2)
|
|
err = err2;
|
|
mnt_drop_write(fhp->fh_export->ex_path.mnt);
|
|
/*
|
|
* Update the file handle to get the new inode info.
|
|
*/
|
|
if (!err)
|
|
err = fh_update(resfhp);
|
|
out:
|
|
if (dchild && !IS_ERR(dchild))
|
|
dput(dchild);
|
|
return err;
|
|
|
|
out_nfserr:
|
|
err = nfserrno(host_err);
|
|
goto out;
|
|
}
|
|
|
|
#ifdef CONFIG_NFSD_V3
|
|
/*
|
|
* NFSv3 version of nfsd_create
|
|
*/
|
|
__be32
|
|
nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp,
|
|
char *fname, int flen, struct iattr *iap,
|
|
struct svc_fh *resfhp, int createmode, u32 *verifier,
|
|
int *truncp, int *created)
|
|
{
|
|
struct dentry *dentry, *dchild = NULL;
|
|
struct inode *dirp;
|
|
__be32 err;
|
|
__be32 err2;
|
|
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_CREATE);
|
|
if (err)
|
|
goto out;
|
|
|
|
dentry = fhp->fh_dentry;
|
|
dirp = dentry->d_inode;
|
|
|
|
/* Get all the sanity checks out of the way before
|
|
* we lock the parent. */
|
|
err = nfserr_notdir;
|
|
if (!dirp->i_op->lookup)
|
|
goto out;
|
|
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;
|
|
|
|
err = fh_compose(resfhp, fhp->fh_export, dchild, fhp);
|
|
if (err)
|
|
goto out;
|
|
|
|
if (createmode == NFS3_CREATE_EXCLUSIVE) {
|
|
/* 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;
|
|
}
|
|
|
|
host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
|
|
if (host_err)
|
|
goto out_nfserr;
|
|
if (dchild->d_inode) {
|
|
err = 0;
|
|
|
|
switch (createmode) {
|
|
case NFS3_CREATE_UNCHECKED:
|
|
if (! S_ISREG(dchild->d_inode->i_mode))
|
|
err = nfserr_exist;
|
|
else if (truncp) {
|
|
/* in nfsv4, we need to treat this case a little
|
|
* differently. we don't want to truncate the
|
|
* file now; this would be wrong if the OPEN
|
|
* fails for some other reason. furthermore,
|
|
* if the size is nonzero, we should ignore it
|
|
* according to spec!
|
|
*/
|
|
*truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size;
|
|
}
|
|
else {
|
|
iap->ia_valid &= ATTR_SIZE;
|
|
goto set_attr;
|
|
}
|
|
break;
|
|
case NFS3_CREATE_EXCLUSIVE:
|
|
if ( dchild->d_inode->i_mtime.tv_sec == v_mtime
|
|
&& dchild->d_inode->i_atime.tv_sec == v_atime
|
|
&& dchild->d_inode->i_size == 0 )
|
|
break;
|
|
/* fallthru */
|
|
case NFS3_CREATE_GUARDED:
|
|
err = nfserr_exist;
|
|
}
|
|
mnt_drop_write(fhp->fh_export->ex_path.mnt);
|
|
goto out;
|
|
}
|
|
|
|
host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
|
|
if (host_err < 0) {
|
|
mnt_drop_write(fhp->fh_export->ex_path.mnt);
|
|
goto out_nfserr;
|
|
}
|
|
if (created)
|
|
*created = 1;
|
|
|
|
if (EX_ISSYNC(fhp->fh_export)) {
|
|
err = nfserrno(nfsd_sync_dir(dentry));
|
|
/* setattr will sync the child (or not) */
|
|
}
|
|
|
|
nfsd_check_ignore_resizing(iap);
|
|
|
|
if (createmode == NFS3_CREATE_EXCLUSIVE) {
|
|
/* 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:
|
|
err2 = nfsd_create_setattr(rqstp, resfhp, iap);
|
|
if (err2)
|
|
err = err2;
|
|
|
|
mnt_drop_write(fhp->fh_export->ex_path.mnt);
|
|
/*
|
|
* 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);
|
|
return err;
|
|
|
|
out_nfserr:
|
|
err = nfserrno(host_err);
|
|
goto out;
|
|
}
|
|
#endif /* CONFIG_NFSD_V3 */
|
|
|
|
/*
|
|
* Read a symlink. On entry, *lenp must contain the maximum path length that
|
|
* fits into the buffer. On return, it contains the true length.
|
|
* N.B. After this call fhp needs an fh_put
|
|
*/
|
|
__be32
|
|
nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp)
|
|
{
|
|
struct dentry *dentry;
|
|
struct inode *inode;
|
|
mm_segment_t oldfs;
|
|
__be32 err;
|
|
int host_err;
|
|
|
|
err = fh_verify(rqstp, fhp, S_IFLNK, NFSD_MAY_NOP);
|
|
if (err)
|
|
goto out;
|
|
|
|
dentry = fhp->fh_dentry;
|
|
inode = dentry->d_inode;
|
|
|
|
err = nfserr_inval;
|
|
if (!inode->i_op->readlink)
|
|
goto out;
|
|
|
|
touch_atime(fhp->fh_export->ex_path.mnt, dentry);
|
|
/* 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 = inode->i_op->readlink(dentry, 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;
|
|
}
|
|
|
|
/*
|
|
* 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, int plen,
|
|
struct svc_fh *resfhp,
|
|
struct iattr *iap)
|
|
{
|
|
struct dentry *dentry, *dnew;
|
|
__be32 err, cerr;
|
|
int host_err;
|
|
|
|
err = nfserr_noent;
|
|
if (!flen || !plen)
|
|
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;
|
|
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 = mnt_want_write(fhp->fh_export->ex_path.mnt);
|
|
if (host_err)
|
|
goto out_nfserr;
|
|
|
|
if (unlikely(path[plen] != 0)) {
|
|
char *path_alloced = kmalloc(plen+1, GFP_KERNEL);
|
|
if (path_alloced == NULL)
|
|
host_err = -ENOMEM;
|
|
else {
|
|
strncpy(path_alloced, path, plen);
|
|
path_alloced[plen] = 0;
|
|
host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced);
|
|
kfree(path_alloced);
|
|
}
|
|
} else
|
|
host_err = vfs_symlink(dentry->d_inode, dnew, path);
|
|
|
|
if (!host_err) {
|
|
if (EX_ISSYNC(fhp->fh_export))
|
|
host_err = nfsd_sync_dir(dentry);
|
|
}
|
|
err = nfserrno(host_err);
|
|
fh_unlock(fhp);
|
|
|
|
mnt_drop_write(fhp->fh_export->ex_path.mnt);
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* 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, *dest;
|
|
__be32 err;
|
|
int host_err;
|
|
|
|
err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE);
|
|
if (err)
|
|
goto out;
|
|
err = fh_verify(rqstp, tfhp, -S_IFDIR, NFSD_MAY_NOP);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = nfserr_perm;
|
|
if (!len)
|
|
goto out;
|
|
err = nfserr_exist;
|
|
if (isdotent(name, len))
|
|
goto out;
|
|
|
|
fh_lock_nested(ffhp, I_MUTEX_PARENT);
|
|
ddir = ffhp->fh_dentry;
|
|
dirp = ddir->d_inode;
|
|
|
|
dnew = lookup_one_len(name, ddir, len);
|
|
host_err = PTR_ERR(dnew);
|
|
if (IS_ERR(dnew))
|
|
goto out_nfserr;
|
|
|
|
dold = tfhp->fh_dentry;
|
|
dest = dold->d_inode;
|
|
|
|
host_err = mnt_want_write(tfhp->fh_export->ex_path.mnt);
|
|
if (host_err) {
|
|
err = nfserrno(host_err);
|
|
goto out_dput;
|
|
}
|
|
host_err = vfs_link(dold, dirp, dnew);
|
|
if (!host_err) {
|
|
if (EX_ISSYNC(ffhp->fh_export)) {
|
|
err = nfserrno(nfsd_sync_dir(ddir));
|
|
write_inode_now(dest, 1);
|
|
}
|
|
err = 0;
|
|
} else {
|
|
if (host_err == -EXDEV && rqstp->rq_vers == 2)
|
|
err = nfserr_acces;
|
|
else
|
|
err = nfserrno(host_err);
|
|
}
|
|
mnt_drop_write(tfhp->fh_export->ex_path.mnt);
|
|
out_dput:
|
|
dput(dnew);
|
|
out_unlock:
|
|
fh_unlock(ffhp);
|
|
out:
|
|
return err;
|
|
|
|
out_nfserr:
|
|
err = nfserrno(host_err);
|
|
goto out_unlock;
|
|
}
|
|
|
|
/*
|
|
* 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 = fdentry->d_inode;
|
|
|
|
tdentry = tfhp->fh_dentry;
|
|
tdir = tdentry->d_inode;
|
|
|
|
err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev;
|
|
if (ffhp->fh_export != tfhp->fh_export)
|
|
goto out;
|
|
|
|
err = nfserr_perm;
|
|
if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen))
|
|
goto out;
|
|
|
|
/* cannot use fh_lock as we need deadlock protective ordering
|
|
* so do it by hand */
|
|
trap = lock_rename(tdentry, fdentry);
|
|
ffhp->fh_locked = tfhp->fh_locked = 1;
|
|
fill_pre_wcc(ffhp);
|
|
fill_pre_wcc(tfhp);
|
|
|
|
odentry = lookup_one_len(fname, fdentry, flen);
|
|
host_err = PTR_ERR(odentry);
|
|
if (IS_ERR(odentry))
|
|
goto out_nfserr;
|
|
|
|
host_err = -ENOENT;
|
|
if (!odentry->d_inode)
|
|
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;
|
|
|
|
if (svc_msnfs(ffhp) &&
|
|
((atomic_read(&odentry->d_count) > 1)
|
|
|| (atomic_read(&ndentry->d_count) > 1))) {
|
|
host_err = -EPERM;
|
|
goto out_dput_new;
|
|
}
|
|
|
|
host_err = -EXDEV;
|
|
if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt)
|
|
goto out_dput_new;
|
|
host_err = mnt_want_write(ffhp->fh_export->ex_path.mnt);
|
|
if (host_err)
|
|
goto out_dput_new;
|
|
|
|
host_err = vfs_rename(fdir, odentry, tdir, ndentry);
|
|
if (!host_err && EX_ISSYNC(tfhp->fh_export)) {
|
|
host_err = nfsd_sync_dir(tdentry);
|
|
if (!host_err)
|
|
host_err = nfsd_sync_dir(fdentry);
|
|
}
|
|
|
|
mnt_drop_write(ffhp->fh_export->ex_path.mnt);
|
|
|
|
out_dput_new:
|
|
dput(ndentry);
|
|
out_dput_old:
|
|
dput(odentry);
|
|
out_nfserr:
|
|
err = nfserrno(host_err);
|
|
|
|
/* we cannot reply on fh_unlock on the two filehandles,
|
|
* as that would do the wrong thing if the two directories
|
|
* were the same, so again we do it by hand
|
|
*/
|
|
fill_post_wcc(ffhp);
|
|
fill_post_wcc(tfhp);
|
|
unlock_rename(tdentry, fdentry);
|
|
ffhp->fh_locked = tfhp->fh_locked = 0;
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Unlink a file or directory
|
|
* N.B. After this call fhp needs an fh_put
|
|
*/
|
|
__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;
|
|
|
|
fh_lock_nested(fhp, I_MUTEX_PARENT);
|
|
dentry = fhp->fh_dentry;
|
|
dirp = dentry->d_inode;
|
|
|
|
rdentry = lookup_one_len(fname, dentry, flen);
|
|
host_err = PTR_ERR(rdentry);
|
|
if (IS_ERR(rdentry))
|
|
goto out_nfserr;
|
|
|
|
if (!rdentry->d_inode) {
|
|
dput(rdentry);
|
|
err = nfserr_noent;
|
|
goto out;
|
|
}
|
|
|
|
if (!type)
|
|
type = rdentry->d_inode->i_mode & S_IFMT;
|
|
|
|
host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
|
|
if (host_err)
|
|
goto out_nfserr;
|
|
|
|
if (type != S_IFDIR) { /* It's UNLINK */
|
|
#ifdef MSNFS
|
|
if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
|
|
(atomic_read(&rdentry->d_count) > 1)) {
|
|
host_err = -EPERM;
|
|
} else
|
|
#endif
|
|
host_err = vfs_unlink(dirp, rdentry);
|
|
} else { /* It's RMDIR */
|
|
host_err = vfs_rmdir(dirp, rdentry);
|
|
}
|
|
|
|
dput(rdentry);
|
|
|
|
if (host_err)
|
|
goto out_drop;
|
|
if (EX_ISSYNC(fhp->fh_export))
|
|
host_err = nfsd_sync_dir(dentry);
|
|
|
|
out_drop:
|
|
mnt_drop_write(fhp->fh_export->ex_path.mnt);
|
|
out_nfserr:
|
|
err = nfserrno(host_err);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* 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 {
|
|
char *dirent;
|
|
size_t used;
|
|
int full;
|
|
};
|
|
|
|
static int nfsd_buffered_filldir(void *__buf, const char *name, int namlen,
|
|
loff_t offset, u64 ino, unsigned int d_type)
|
|
{
|
|
struct readdir_data *buf = __buf;
|
|
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;
|
|
}
|
|
|
|
static __be32 nfsd_buffered_readdir(struct file *file, filldir_t func,
|
|
struct readdir_cd *cdp, loff_t *offsetp)
|
|
{
|
|
struct readdir_data buf;
|
|
struct buffered_dirent *de;
|
|
int host_err;
|
|
int size;
|
|
loff_t offset;
|
|
|
|
buf.dirent = (void *)__get_free_page(GFP_KERNEL);
|
|
if (!buf.dirent)
|
|
return nfserrno(-ENOMEM);
|
|
|
|
offset = *offsetp;
|
|
|
|
while (1) {
|
|
struct inode *dir_inode = file->f_path.dentry->d_inode;
|
|
unsigned int reclen;
|
|
|
|
cdp->err = nfserr_eof; /* will be cleared on successful read */
|
|
buf.used = 0;
|
|
buf.full = 0;
|
|
|
|
host_err = vfs_readdir(file, nfsd_buffered_filldir, &buf);
|
|
if (buf.full)
|
|
host_err = 0;
|
|
|
|
if (host_err < 0)
|
|
break;
|
|
|
|
size = buf.used;
|
|
|
|
if (!size)
|
|
break;
|
|
|
|
/*
|
|
* Various filldir functions may end up calling back into
|
|
* lookup_one_len() and the file system's ->lookup() method.
|
|
* These expect i_mutex to be held, as it would within readdir.
|
|
*/
|
|
host_err = mutex_lock_killable(&dir_inode->i_mutex);
|
|
if (host_err)
|
|
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);
|
|
}
|
|
mutex_unlock(&dir_inode->i_mutex);
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* 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, filldir_t func)
|
|
{
|
|
__be32 err;
|
|
struct file *file;
|
|
loff_t offset = *offsetp;
|
|
|
|
err = nfsd_open(rqstp, fhp, S_IFDIR, NFSD_MAY_READ, &file);
|
|
if (err)
|
|
goto out;
|
|
|
|
offset = vfs_llseek(file, offset, 0);
|
|
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:
|
|
nfsd_close(file);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* 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 = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access);
|
|
if (!err && vfs_statfs(fhp->fh_dentry,stat))
|
|
err = nfserr_io;
|
|
return err;
|
|
}
|
|
|
|
static int exp_rdonly(struct svc_rqst *rqstp, struct svc_export *exp)
|
|
{
|
|
return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY;
|
|
}
|
|
|
|
/*
|
|
* 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 = dentry->d_inode;
|
|
struct path path;
|
|
int err;
|
|
|
|
if (acc == 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) &&
|
|
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))
|
|
err = inode_permission(inode, MAY_EXEC);
|
|
if (err)
|
|
goto nfsd_out;
|
|
|
|
/* Do integrity (permission) checking now, but defer incrementing
|
|
* IMA counts to the actual file open.
|
|
*/
|
|
path.mnt = exp->ex_path.mnt;
|
|
path.dentry = dentry;
|
|
err = ima_path_check(&path, acc & (MAY_READ | MAY_WRITE | MAY_EXEC),
|
|
IMA_COUNT_LEAVE);
|
|
nfsd_out:
|
|
return err? nfserrno(err) : 0;
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|
|
/*
|
|
* 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);
|
|
if (nperbucket < 2)
|
|
nperbucket = 2;
|
|
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;
|
|
}
|
|
|
|
#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
|
|
struct posix_acl *
|
|
nfsd_get_posix_acl(struct svc_fh *fhp, int type)
|
|
{
|
|
struct inode *inode = fhp->fh_dentry->d_inode;
|
|
char *name;
|
|
void *value = NULL;
|
|
ssize_t size;
|
|
struct posix_acl *acl;
|
|
|
|
if (!IS_POSIXACL(inode))
|
|
return ERR_PTR(-EOPNOTSUPP);
|
|
|
|
switch (type) {
|
|
case ACL_TYPE_ACCESS:
|
|
name = POSIX_ACL_XATTR_ACCESS;
|
|
break;
|
|
case ACL_TYPE_DEFAULT:
|
|
name = POSIX_ACL_XATTR_DEFAULT;
|
|
break;
|
|
default:
|
|
return ERR_PTR(-EOPNOTSUPP);
|
|
}
|
|
|
|
size = nfsd_getxattr(fhp->fh_dentry, name, &value);
|
|
if (size < 0)
|
|
return ERR_PTR(size);
|
|
|
|
acl = posix_acl_from_xattr(value, size);
|
|
kfree(value);
|
|
return acl;
|
|
}
|
|
|
|
int
|
|
nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl)
|
|
{
|
|
struct inode *inode = fhp->fh_dentry->d_inode;
|
|
char *name;
|
|
void *value = NULL;
|
|
size_t size;
|
|
int error;
|
|
|
|
if (!IS_POSIXACL(inode) ||
|
|
!inode->i_op->setxattr || !inode->i_op->removexattr)
|
|
return -EOPNOTSUPP;
|
|
switch(type) {
|
|
case ACL_TYPE_ACCESS:
|
|
name = POSIX_ACL_XATTR_ACCESS;
|
|
break;
|
|
case ACL_TYPE_DEFAULT:
|
|
name = POSIX_ACL_XATTR_DEFAULT;
|
|
break;
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
if (acl && acl->a_count) {
|
|
size = posix_acl_xattr_size(acl->a_count);
|
|
value = kmalloc(size, GFP_KERNEL);
|
|
if (!value)
|
|
return -ENOMEM;
|
|
error = posix_acl_to_xattr(acl, value, size);
|
|
if (error < 0)
|
|
goto getout;
|
|
size = error;
|
|
} else
|
|
size = 0;
|
|
|
|
error = mnt_want_write(fhp->fh_export->ex_path.mnt);
|
|
if (error)
|
|
goto getout;
|
|
if (size)
|
|
error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0);
|
|
else {
|
|
if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT)
|
|
error = 0;
|
|
else {
|
|
error = vfs_removexattr(fhp->fh_dentry, name);
|
|
if (error == -ENODATA)
|
|
error = 0;
|
|
}
|
|
}
|
|
mnt_drop_write(fhp->fh_export->ex_path.mnt);
|
|
|
|
getout:
|
|
kfree(value);
|
|
return error;
|
|
}
|
|
#endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */
|