Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
new file mode 100644
index 0000000..e3e9d21
--- /dev/null
+++ b/fs/nfsd/vfs.c
@@ -0,0 +1,1859 @@
+#define MSNFS /* HACK HACK */
+/*
+ * linux/fs/nfsd/vfs.c
+ *
+ * File operations used by nfsd. Some of these have been ripped from
+ * other parts of the kernel because they weren't exported, others
+ * are partial duplicates with added or changed functionality.
+ *
+ * Note that several functions dget() the dentry upon which they want
+ * to act, most notably those that create directory entries. Response
+ * dentry's are dput()'d if necessary in the release callback.
+ * So if you notice code paths that apparently fail to dput() the
+ * dentry, don't worry--they have been taken care of.
+ *
+ * Copyright (C) 1995-1999 Olaf Kirch <okir@monad.swb.de>
+ * Zerocpy NFS support (C) 2002 Hirokazu Takahashi <taka@valinux.co.jp>
+ */
+
+#include <linux/config.h>
+#include <linux/string.h>
+#include <linux/time.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/mount.h>
+#include <linux/major.h>
+#include <linux/ext2_fs.h>
+#include <linux/proc_fs.h>
+#include <linux/stat.h>
+#include <linux/fcntl.h>
+#include <linux/net.h>
+#include <linux/unistd.h>
+#include <linux/slab.h>
+#include <linux/pagemap.h>
+#include <linux/in.h>
+#include <linux/module.h>
+#include <linux/namei.h>
+#include <linux/vfs.h>
+#include <linux/delay.h>
+#include <linux/sunrpc/svc.h>
+#include <linux/nfsd/nfsd.h>
+#ifdef CONFIG_NFSD_V3
+#include <linux/nfs3.h>
+#include <linux/nfsd/xdr3.h>
+#endif /* CONFIG_NFSD_V3 */
+#include <linux/nfsd/nfsfh.h>
+#include <linux/quotaops.h>
+#include <linux/dnotify.h>
+#ifdef CONFIG_NFSD_V4
+#include <linux/posix_acl.h>
+#include <linux/posix_acl_xattr.h>
+#include <linux/xattr_acl.h>
+#include <linux/xattr.h>
+#include <linux/nfs4.h>
+#include <linux/nfs4_acl.h>
+#include <linux/nfsd_idmap.h>
+#include <linux/security.h>
+#endif /* CONFIG_NFSD_V4 */
+
+#include <asm/uaccess.h>
+
+#define NFSDDBG_FACILITY NFSDDBG_FILEOP
+#define NFSD_PARANOIA
+
+
+/* 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.
+ */
+#define IS_ISMNDLK(i) (S_ISREG((i)->i_mode) && MANDATORY_LOCK(i))
+
+/*
+ * This is a cache of readahead params that help us choose the proper
+ * readahead strategy. Initially, we set all readahead parameters to 0
+ * and let the VFS handle things.
+ * If you increase the number of cached files very much, you'll need to
+ * add a hash table here.
+ */
+struct raparms {
+ struct raparms *p_next;
+ unsigned int p_count;
+ ino_t p_ino;
+ dev_t p_dev;
+ int p_set;
+ struct file_ra_state p_ra;
+};
+
+static struct raparms * raparml;
+static struct raparms * raparm_cache;
+
+/*
+ * Called from nfsd_lookup and encode_dirent. Check if we have crossed
+ * a mount point.
+ * Returns -EAGAIN leaving *dpp and *expp unchanged,
+ * or nfs_ok having possibly changed *dpp and *expp
+ */
+int
+nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp,
+ struct svc_export **expp)
+{
+ struct svc_export *exp = *expp, *exp2 = NULL;
+ struct dentry *dentry = *dpp;
+ struct vfsmount *mnt = mntget(exp->ex_mnt);
+ struct dentry *mounts = dget(dentry);
+ int err = nfs_ok;
+
+ while (follow_down(&mnt,&mounts)&&d_mountpoint(mounts));
+
+ exp2 = exp_get_by_name(exp->ex_client, mnt, mounts, &rqstp->rq_chandle);
+ if (IS_ERR(exp2)) {
+ err = PTR_ERR(exp2);
+ dput(mounts);
+ mntput(mnt);
+ goto out;
+ }
+ if (exp2 && ((exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2))) {
+ /* successfully crossed mount point */
+ exp_put(exp);
+ *expp = exp2;
+ dput(dentry);
+ *dpp = mounts;
+ } else {
+ if (exp2) exp_put(exp2);
+ dput(mounts);
+ }
+ mntput(mnt);
+out:
+ return err;
+}
+
+/*
+ * Look up one component of a pathname.
+ * N.B. After this call _both_ fhp and resfh need an fh_put
+ *
+ * If the lookup would cross a mountpoint, and the mounted filesystem
+ * is exported to the client with NFSEXP_NOHIDE, then the lookup is
+ * accepted as it stands and the mounted directory is
+ * returned. Otherwise the covered directory is returned.
+ * NOTE: this mountpoint crossing is not supported properly by all
+ * clients and is explicitly disallowed for NFSv3
+ * NeilBrown <neilb@cse.unsw.edu.au>
+ */
+int
+nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name,
+ int len, struct svc_fh *resfh)
+{
+ struct svc_export *exp;
+ struct dentry *dparent;
+ struct dentry *dentry;
+ int err;
+
+ dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name);
+
+ /* Obtain dentry and export. */
+ err = fh_verify(rqstp, fhp, S_IFDIR, MAY_EXEC);
+ if (err)
+ return err;
+
+ dparent = fhp->fh_dentry;
+ exp = fhp->fh_export;
+ exp_get(exp);
+
+ err = nfserr_acces;
+
+ /* Lookup the name, but don't follow links */
+ if (isdotent(name, len)) {
+ if (len==1)
+ dentry = dget(dparent);
+ else if (dparent != exp->ex_dentry) {
+ dentry = dget_parent(dparent);
+ } else if (!EX_NOHIDE(exp))
+ dentry = dget(dparent); /* .. == . just like at / */
+ else {
+ /* checking mountpoint crossing is very different when stepping up */
+ struct svc_export *exp2 = NULL;
+ struct dentry *dp;
+ struct vfsmount *mnt = mntget(exp->ex_mnt);
+ dentry = dget(dparent);
+ while(dentry == mnt->mnt_root && follow_up(&mnt, &dentry))
+ ;
+ dp = dget_parent(dentry);
+ dput(dentry);
+ dentry = dp;
+
+ exp2 = exp_parent(exp->ex_client, mnt, dentry,
+ &rqstp->rq_chandle);
+ if (IS_ERR(exp2)) {
+ err = PTR_ERR(exp2);
+ dput(dentry);
+ mntput(mnt);
+ goto out_nfserr;
+ }
+ if (!exp2) {
+ dput(dentry);
+ dentry = dget(dparent);
+ } else {
+ exp_put(exp);
+ exp = exp2;
+ }
+ mntput(mnt);
+ }
+ } else {
+ fh_lock(fhp);
+ dentry = lookup_one_len(name, dparent, len);
+ err = PTR_ERR(dentry);
+ if (IS_ERR(dentry))
+ goto out_nfserr;
+ /*
+ * check if we have crossed a mount point ...
+ */
+ if (d_mountpoint(dentry)) {
+ if ((err = nfsd_cross_mnt(rqstp, &dentry, &exp))) {
+ dput(dentry);
+ goto out_nfserr;
+ }
+ }
+ }
+ /*
+ * Note: we compose the file handle now, but as the
+ * dentry may be negative, it may need to be updated.
+ */
+ err = fh_compose(resfh, exp, dentry, fhp);
+ if (!err && !dentry->d_inode)
+ err = nfserr_noent;
+ dput(dentry);
+out:
+ exp_put(exp);
+ return err;
+
+out_nfserr:
+ err = nfserrno(err);
+ goto out;
+}
+
+/*
+ * Set various file attributes.
+ * N.B. After this call fhp needs an fh_put
+ */
+int
+nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap,
+ int check_guard, time_t guardtime)
+{
+ struct dentry *dentry;
+ struct inode *inode;
+ int accmode = MAY_SATTR;
+ int ftype = 0;
+ int imode;
+ int err;
+ int size_change = 0;
+
+ if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE))
+ accmode |= MAY_WRITE|MAY_OWNER_OVERRIDE;
+ if (iap->ia_valid & ATTR_SIZE)
+ ftype = S_IFREG;
+
+ /* Get inode */
+ err = fh_verify(rqstp, fhp, ftype, accmode);
+ if (err || !iap->ia_valid)
+ goto out;
+
+ dentry = fhp->fh_dentry;
+ inode = dentry->d_inode;
+
+ /* NFSv2 does not differentiate between "set-[ac]time-to-now"
+ * which only requires access, and "set-[ac]time-to-X" which
+ * requires ownership.
+ * So if it looks like it might be "set both to the same time which
+ * is close to now", and if inode_change_ok fails, then we
+ * convert to "set to now" instead of "set to explicit time"
+ *
+ * We only call inode_change_ok as the last test as technically
+ * it is not an interface that we should be using. It is only
+ * valid if the filesystem does not define it's own i_op->setattr.
+ */
+#define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
+#define MAX_TOUCH_TIME_ERROR (30*60)
+ if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET
+ && iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec
+ ) {
+ /* Looks probable. Now just make sure time is in the right ballpark.
+ * Solaris, at least, doesn't seem to care what the time request is.
+ * We require it be within 30 minutes of now.
+ */
+ time_t delta = iap->ia_atime.tv_sec - get_seconds();
+ if (delta<0) delta = -delta;
+ if (delta < MAX_TOUCH_TIME_ERROR &&
+ inode_change_ok(inode, iap) != 0) {
+ /* turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME
+ * this will cause notify_change to set these times to "now"
+ */
+ iap->ia_valid &= ~BOTH_TIME_SET;
+ }
+ }
+
+ /* The size case is special. It changes the file as well as the attributes. */
+ if (iap->ia_valid & ATTR_SIZE) {
+ if (iap->ia_size < inode->i_size) {
+ err = nfsd_permission(fhp->fh_export, dentry, MAY_TRUNC|MAY_OWNER_OVERRIDE);
+ if (err)
+ goto out;
+ }
+
+ /*
+ * If we are changing the size of the file, then
+ * we need to break all leases.
+ */
+ err = break_lease(inode, FMODE_WRITE | O_NONBLOCK);
+ if (err == -EWOULDBLOCK)
+ err = -ETIMEDOUT;
+ if (err) /* ENOMEM or EWOULDBLOCK */
+ goto out_nfserr;
+
+ err = get_write_access(inode);
+ if (err)
+ goto out_nfserr;
+
+ size_change = 1;
+ err = locks_verify_truncate(inode, NULL, iap->ia_size);
+ if (err) {
+ put_write_access(inode);
+ goto out_nfserr;
+ }
+ DQUOT_INIT(inode);
+ }
+
+ imode = inode->i_mode;
+ if (iap->ia_valid & ATTR_MODE) {
+ iap->ia_mode &= S_IALLUGO;
+ imode = iap->ia_mode |= (imode & ~S_IALLUGO);
+ }
+
+ /* Revoke setuid/setgid bit on chown/chgrp */
+ if ((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid)
+ iap->ia_valid |= ATTR_KILL_SUID;
+ if ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid)
+ iap->ia_valid |= 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);
+ err = notify_change(dentry, iap);
+ err = nfserrno(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(err);
+ goto out;
+}
+
+#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;
+ struct inode *inode = dentry->d_inode;
+
+ 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 = -EOPNOTSUPP;
+ if (inode->i_op && inode->i_op->setxattr) {
+ down(&inode->i_sem);
+ security_inode_setxattr(dentry, key, buf, len, 0);
+ error = inode->i_op->setxattr(dentry, key, buf, len, 0);
+ if (!error)
+ security_inode_post_setxattr(dentry, key, buf, len, 0);
+ up(&inode->i_sem);
+ }
+out:
+ kfree(buf);
+ return error;
+}
+
+int
+nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
+ struct nfs4_acl *acl)
+{
+ int 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 */, MAY_SATTR);
+ if (error)
+ goto out;
+
+ dentry = fhp->fh_dentry;
+ inode = dentry->d_inode;
+ if (S_ISDIR(inode->i_mode))
+ flags = NFS4_ACL_DIR;
+
+ error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags);
+ if (error == -EINVAL) {
+ error = nfserr_attrnotsupp;
+ goto out;
+ } else if (error < 0)
+ goto out_nfserr;
+
+ if (pacl) {
+ error = set_nfsv4_acl_one(dentry, pacl, XATTR_NAME_ACL_ACCESS);
+ if (error < 0)
+ goto out_nfserr;
+ }
+
+ if (dpacl) {
+ error = set_nfsv4_acl_one(dentry, dpacl, XATTR_NAME_ACL_DEFAULT);
+ if (error < 0)
+ goto out_nfserr;
+ }
+
+ error = nfs_ok;
+
+out:
+ posix_acl_release(pacl);
+ posix_acl_release(dpacl);
+ return (error);
+out_nfserr:
+ error = nfserrno(error);
+ goto out;
+}
+
+static struct posix_acl *
+_get_posix_acl(struct dentry *dentry, char *key)
+{
+ struct inode *inode = dentry->d_inode;
+ char *buf = NULL;
+ int buflen, error = 0;
+ struct posix_acl *pacl = NULL;
+
+ error = -EOPNOTSUPP;
+ if (inode->i_op == NULL)
+ goto out_err;
+ if (inode->i_op->getxattr == NULL)
+ goto out_err;
+
+ error = security_inode_getxattr(dentry, key);
+ if (error)
+ goto out_err;
+
+ buflen = inode->i_op->getxattr(dentry, key, NULL, 0);
+ if (buflen <= 0) {
+ error = buflen < 0 ? buflen : -ENODATA;
+ goto out_err;
+ }
+
+ buf = kmalloc(buflen, GFP_KERNEL);
+ if (buf == NULL) {
+ error = -ENOMEM;
+ goto out_err;
+ }
+
+ error = inode->i_op->getxattr(dentry, key, buf, buflen);
+ if (error < 0)
+ goto out_err;
+
+ pacl = posix_acl_from_xattr(buf, buflen);
+ out:
+ kfree(buf);
+ return pacl;
+ out_err:
+ pacl = ERR_PTR(error);
+ goto out;
+}
+
+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, XATTR_NAME_ACL_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, XATTR_NAME_ACL_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, MAY_READ },
+ { NFS3_ACCESS_EXECUTE, MAY_EXEC },
+ { NFS3_ACCESS_MODIFY, MAY_WRITE|MAY_TRUNC },
+ { NFS3_ACCESS_EXTEND, MAY_WRITE },
+
+ { 0, 0 }
+};
+
+static struct accessmap nfs3_diraccess[] = {
+ { NFS3_ACCESS_READ, MAY_READ },
+ { NFS3_ACCESS_LOOKUP, MAY_EXEC },
+ { NFS3_ACCESS_MODIFY, MAY_EXEC|MAY_WRITE|MAY_TRUNC },
+ { NFS3_ACCESS_EXTEND, MAY_EXEC|MAY_WRITE },
+ { NFS3_ACCESS_DELETE, MAY_REMOVE },
+
+ { 0, 0 }
+};
+
+static struct accessmap nfs3_anyaccess[] = {
+ /* Some clients - Solaris 2.6 at least, make an access call
+ * to the server to check for access for things like /dev/null
+ * (which really, the server doesn't care about). So
+ * We provide simple access checking for them, looking
+ * mainly at mode bits, and we make sure to ignore read-only
+ * filesystem checks
+ */
+ { NFS3_ACCESS_READ, MAY_READ },
+ { NFS3_ACCESS_EXECUTE, MAY_EXEC },
+ { NFS3_ACCESS_MODIFY, MAY_WRITE|MAY_LOCAL_ACCESS },
+ { NFS3_ACCESS_EXTEND, MAY_WRITE|MAY_LOCAL_ACCESS },
+
+ { 0, 0 }
+};
+
+int
+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;
+ unsigned int error;
+
+ error = fh_verify(rqstp, fhp, 0, MAY_NOP);
+ if (error)
+ goto out;
+
+ export = fhp->fh_export;
+ dentry = fhp->fh_dentry;
+
+ if (S_ISREG(dentry->d_inode->i_mode))
+ map = nfs3_regaccess;
+ else if (S_ISDIR(dentry->d_inode->i_mode))
+ map = nfs3_diraccess;
+ else
+ map = nfs3_anyaccess;
+
+
+ query = *access;
+ for (; map->access; map++) {
+ if (map->access & query) {
+ unsigned int err2;
+
+ sresult |= map->access;
+
+ err2 = nfsd_permission(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
+ */
+int
+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, err;
+
+ /*
+ * If we get here, then the client has already done an "open",
+ * and (hopefully) checked permission - so allow OWNER_OVERRIDE
+ * in case a chmod has now revoked permission.
+ */
+ err = fh_verify(rqstp, fhp, type, access | MAY_OWNER_OVERRIDE);
+ if (err)
+ goto out;
+
+ dentry = fhp->fh_dentry;
+ inode = dentry->d_inode;
+
+ /* Disallow write access to files with the append-only bit set
+ * or any access when mandatory locking enabled
+ */
+ err = nfserr_perm;
+ if (IS_APPEND(inode) && (access & MAY_WRITE))
+ goto out;
+ if (IS_ISMNDLK(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.
+ */
+ err = break_lease(inode, O_NONBLOCK | ((access & MAY_WRITE) ? FMODE_WRITE : 0));
+ if (err == -EWOULDBLOCK)
+ err = -ETIMEDOUT;
+ if (err) /* NOMEM or WOULDBLOCK */
+ goto out_nfserr;
+
+ if (access & MAY_WRITE) {
+ flags = O_WRONLY|O_LARGEFILE;
+
+ DQUOT_INIT(inode);
+ }
+ *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_mnt), flags);
+ if (IS_ERR(*filp))
+ err = PTR_ERR(*filp);
+out_nfserr:
+ if (err)
+ err = nfserrno(err);
+out:
+ return err;
+}
+
+/*
+ * Close a file.
+ */
+void
+nfsd_close(struct file *filp)
+{
+ fput(filp);
+}
+
+/*
+ * Sync a file
+ * As this calls fsync (not fdatasync) there is no need for a write_inode
+ * after it.
+ */
+static inline void nfsd_dosync(struct file *filp, struct dentry *dp,
+ struct file_operations *fop)
+{
+ struct inode *inode = dp->d_inode;
+ int (*fsync) (struct file *, struct dentry *, int);
+
+ filemap_fdatawrite(inode->i_mapping);
+ if (fop && (fsync = fop->fsync))
+ fsync(filp, dp, 0);
+ filemap_fdatawait(inode->i_mapping);
+}
+
+
+static void
+nfsd_sync(struct file *filp)
+{
+ struct inode *inode = filp->f_dentry->d_inode;
+ dprintk("nfsd: sync file %s\n", filp->f_dentry->d_name.name);
+ down(&inode->i_sem);
+ nfsd_dosync(filp, filp->f_dentry, filp->f_op);
+ up(&inode->i_sem);
+}
+
+static void
+nfsd_sync_dir(struct dentry *dp)
+{
+ nfsd_dosync(NULL, dp, dp->d_inode->i_fop);
+}
+
+/*
+ * Obtain the readahead parameters for the file
+ * specified by (dev, ino).
+ */
+static DEFINE_SPINLOCK(ra_lock);
+
+static inline struct raparms *
+nfsd_get_raparms(dev_t dev, ino_t ino)
+{
+ struct raparms *ra, **rap, **frap = NULL;
+ int depth = 0;
+
+ spin_lock(&ra_lock);
+ for (rap = &raparm_cache; (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(&ra_lock);
+ return NULL;
+ }
+ rap = frap;
+ ra = *frap;
+ ra->p_dev = dev;
+ ra->p_ino = ino;
+ ra->p_set = 0;
+found:
+ if (rap != &raparm_cache) {
+ *rap = ra->p_next;
+ ra->p_next = raparm_cache;
+ raparm_cache = ra;
+ }
+ ra->p_count++;
+ nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++;
+ spin_unlock(&ra_lock);
+ return ra;
+}
+
+/*
+ * Grab and keep cached pages assosiated with a file in the svc_rqst
+ * so that they can be passed to the netowork sendmsg/sendpage routines
+ * directrly. They will be released after the sending has completed.
+ */
+static int
+nfsd_read_actor(read_descriptor_t *desc, struct page *page, unsigned long offset , unsigned long size)
+{
+ unsigned long count = desc->count;
+ struct svc_rqst *rqstp = desc->arg.data;
+
+ if (size > count)
+ size = count;
+
+ if (rqstp->rq_res.page_len == 0) {
+ get_page(page);
+ rqstp->rq_respages[rqstp->rq_resused++] = page;
+ rqstp->rq_res.page_base = offset;
+ rqstp->rq_res.page_len = size;
+ } else if (page != rqstp->rq_respages[rqstp->rq_resused-1]) {
+ get_page(page);
+ rqstp->rq_respages[rqstp->rq_resused++] = page;
+ rqstp->rq_res.page_len += size;
+ } else {
+ rqstp->rq_res.page_len += size;
+ }
+
+ desc->count = count - size;
+ desc->written += size;
+ return size;
+}
+
+static inline int
+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;
+ int err;
+
+ err = nfserr_perm;
+ inode = file->f_dentry->d_inode;
+#ifdef MSNFS
+ if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
+ (!lock_may_read(inode, offset, *count)))
+ goto out;
+#endif
+
+ /* 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->sendfile) {
+ svc_pushback_unused_pages(rqstp);
+ err = file->f_op->sendfile(file, &offset, *count,
+ nfsd_read_actor, rqstp);
+ } else {
+ oldfs = get_fs();
+ set_fs(KERNEL_DS);
+ err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset);
+ set_fs(oldfs);
+ }
+
+ /* Write back readahead params */
+ if (ra) {
+ spin_lock(&ra_lock);
+ ra->p_ra = file->f_ra;
+ ra->p_set = 1;
+ ra->p_count--;
+ spin_unlock(&ra_lock);
+ }
+
+ if (err >= 0) {
+ nfsdstats.io_read += err;
+ *count = err;
+ err = 0;
+ dnotify_parent(file->f_dentry, DN_ACCESS);
+ } else
+ err = nfserrno(err);
+out:
+ return err;
+}
+
+static inline int
+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;
+ int err = 0;
+ int stable = *stablep;
+
+ err = nfserr_perm;
+
+#ifdef MSNFS
+ if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
+ (!lock_may_write(file->f_dentry->d_inode, offset, cnt)))
+ goto out;
+#endif
+
+ dentry = file->f_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 gathered writes have been configured for this volume,
+ * flushing the data to disk is handled separately below.
+ */
+
+ if (file->f_op->fsync == 0) {/* COMMIT3 cannot work */
+ stable = 2;
+ *stablep = 2; /* FILE_SYNC */
+ }
+
+ if (!EX_ISSYNC(exp))
+ stable = 0;
+ if (stable && !EX_WGATHER(exp))
+ file->f_flags |= O_SYNC;
+
+ /* Write the data. */
+ oldfs = get_fs(); set_fs(KERNEL_DS);
+ err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset);
+ set_fs(oldfs);
+ if (err >= 0) {
+ nfsdstats.io_write += cnt;
+ dnotify_parent(file->f_dentry, DN_MODIFY);
+ }
+
+ /* clear setuid/setgid flag after write */
+ if (err >= 0 && (inode->i_mode & (S_ISUID | S_ISGID))) {
+ struct iattr ia;
+ ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID;
+
+ down(&inode->i_sem);
+ notify_change(dentry, &ia);
+ up(&inode->i_sem);
+ }
+
+ if (err >= 0 && stable) {
+ static ino_t last_ino;
+ static dev_t last_dev;
+
+ /*
+ * Gathered writes: If another process is currently
+ * writing to the file, there's a high chance
+ * this is another nfsd (triggered by a bulk write
+ * from a client's biod). Rather than syncing the
+ * file with each write request, we sleep for 10 msec.
+ *
+ * I don't know if this roughly approximates
+ * C. Juszak's idea of gathered writes, but it's a
+ * nice and simple solution (IMHO), and it seems to
+ * work:-)
+ */
+ if (EX_WGATHER(exp)) {
+ if (atomic_read(&inode->i_writecount) > 1
+ || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) {
+ dprintk("nfsd: write defer %d\n", current->pid);
+ msleep(10);
+ dprintk("nfsd: write resume %d\n", current->pid);
+ }
+
+ if (inode->i_state & I_DIRTY) {
+ dprintk("nfsd: write sync %d\n", current->pid);
+ nfsd_sync(file);
+ }
+#if 0
+ wake_up(&inode->i_wait);
+#endif
+ }
+ last_ino = inode->i_ino;
+ last_dev = inode->i_sb->s_dev;
+ }
+
+ dprintk("nfsd: write complete err=%d\n", err);
+ if (err >= 0)
+ err = 0;
+ else
+ err = nfserrno(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
+ */
+int
+nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
+ loff_t offset, struct kvec *vec, int vlen,
+ unsigned long *count)
+{
+ int err;
+
+ if (file) {
+ err = nfsd_permission(fhp->fh_export, fhp->fh_dentry,
+ MAY_READ|MAY_OWNER_OVERRIDE);
+ if (err)
+ goto out;
+ err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count);
+ } else {
+ err = nfsd_open(rqstp, fhp, S_IFREG, MAY_READ, &file);
+ if (err)
+ goto out;
+ err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count);
+ nfsd_close(file);
+ }
+out:
+ return err;
+}
+
+/*
+ * Write data to a file.
+ * The stable flag requests synchronous writes.
+ * N.B. After this call fhp needs an fh_put
+ */
+int
+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)
+{
+ int err = 0;
+
+ if (file) {
+ err = nfsd_permission(fhp->fh_export, fhp->fh_dentry,
+ MAY_WRITE|MAY_OWNER_OVERRIDE);
+ if (err)
+ goto out;
+ err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt,
+ stablep);
+ } else {
+ err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file);
+ if (err)
+ goto out;
+
+ if (cnt)
+ err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen,
+ cnt, stablep);
+ nfsd_close(file);
+ }
+out:
+ return err;
+}
+
+#ifdef CONFIG_NFSD_V3
+/*
+ * Commit all pending writes to stable storage.
+ * Strictly speaking, we could sync just the indicated file region here,
+ * but there's currently no way we can ask the VFS to do so.
+ *
+ * Unfortunately we cannot lock the file to make sure we return full WCC
+ * data to the client, as locking happens lower down in the filesystem.
+ */
+int
+nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp,
+ loff_t offset, unsigned long count)
+{
+ struct file *file;
+ int err;
+
+ if ((u64)count > ~(u64)offset)
+ return nfserr_inval;
+
+ if ((err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file)) != 0)
+ return err;
+ if (EX_ISSYNC(fhp->fh_export)) {
+ if (file->f_op && file->f_op->fsync) {
+ nfsd_sync(file);
+ } else {
+ err = nfserr_notsupp;
+ }
+ }
+
+ nfsd_close(file);
+ return err;
+}
+#endif /* CONFIG_NFSD_V3 */
+
+/*
+ * 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
+ */
+int
+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;
+ int err;
+
+ err = nfserr_perm;
+ if (!flen)
+ goto out;
+ err = nfserr_exist;
+ if (isdotent(fname, flen))
+ goto out;
+
+ err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE);
+ if (err)
+ goto out;
+
+ dentry = fhp->fh_dentry;
+ dirp = dentry->d_inode;
+
+ err = nfserr_notdir;
+ if(!dirp->i_op || !dirp->i_op->lookup)
+ goto out;
+ /*
+ * Check whether the response file handle has been verified yet.
+ * If it has, the parent directory should already be locked.
+ */
+ if (!resfhp->fh_dentry) {
+ /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */
+ fh_lock(fhp);
+ dchild = lookup_one_len(fname, dentry, flen);
+ 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 = -EIO;
+ goto out;
+ }
+ }
+ /*
+ * Make sure the child dentry is still negative ...
+ */
+ err = nfserr_exist;
+ if (dchild->d_inode) {
+ dprintk("nfsd_create: dentry %s/%s not negative!\n",
+ dentry->d_name.name, dchild->d_name.name);
+ goto out;
+ }
+
+ if (!(iap->ia_valid & ATTR_MODE))
+ iap->ia_mode = 0;
+ iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type;
+
+ /*
+ * Get the dir op function pointer.
+ */
+ err = nfserr_perm;
+ switch (type) {
+ case S_IFREG:
+ err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
+ break;
+ case S_IFDIR:
+ err = vfs_mkdir(dirp, dchild, iap->ia_mode);
+ break;
+ case S_IFCHR:
+ case S_IFBLK:
+ case S_IFIFO:
+ case S_IFSOCK:
+ err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev);
+ break;
+ default:
+ printk("nfsd: bad file type %o in nfsd_create\n", type);
+ err = -EINVAL;
+ }
+ if (err < 0)
+ goto out_nfserr;
+
+ if (EX_ISSYNC(fhp->fh_export)) {
+ nfsd_sync_dir(dentry);
+ write_inode_now(dchild->d_inode, 1);
+ }
+
+
+ /* Set file attributes. Mode has already been set and
+ * setting uid/gid works only for root. Irix appears to
+ * send along the gid when it tries to implement setgid
+ * directories via NFS.
+ */
+ err = 0;
+ if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID|ATTR_MODE)) != 0)
+ err = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0);
+ /*
+ * 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(err);
+ goto out;
+}
+
+#ifdef CONFIG_NFSD_V3
+/*
+ * NFSv3 version of nfsd_create
+ */
+int
+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)
+{
+ struct dentry *dentry, *dchild = NULL;
+ struct inode *dirp;
+ int err;
+ __u32 v_mtime=0, v_atime=0;
+ int v_mode=0;
+
+ err = nfserr_perm;
+ if (!flen)
+ goto out;
+ err = nfserr_exist;
+ if (isdotent(fname, flen))
+ goto out;
+ if (!(iap->ia_valid & ATTR_MODE))
+ iap->ia_mode = 0;
+ err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE);
+ if (err)
+ goto out;
+
+ dentry = fhp->fh_dentry;
+ dirp = dentry->d_inode;
+
+ /* Get all the sanity checks out of the way before
+ * we lock the parent. */
+ err = nfserr_notdir;
+ if(!dirp->i_op || !dirp->i_op->lookup)
+ goto out;
+ fh_lock(fhp);
+
+ /*
+ * Compose the response file handle.
+ */
+ dchild = lookup_one_len(fname, dentry, flen);
+ 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) {
+ /* while the verifier would fit in mtime+atime,
+ * solaris7 gets confused (bugid 4218508) if these have
+ * the high bit set, so we use the mode as well
+ */
+ v_mtime = verifier[0]&0x7fffffff;
+ v_atime = verifier[1]&0x7fffffff;
+ v_mode = S_IFREG
+ | ((verifier[0]&0x80000000) >> (32-7)) /* u+x */
+ | ((verifier[1]&0x80000000) >> (32-9)) /* u+r */
+ ;
+ }
+
+ 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_mode == v_mode
+ && dchild->d_inode->i_size == 0 )
+ break;
+ /* fallthru */
+ case NFS3_CREATE_GUARDED:
+ err = nfserr_exist;
+ }
+ goto out;
+ }
+
+ err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
+ if (err < 0)
+ goto out_nfserr;
+
+ if (EX_ISSYNC(fhp->fh_export)) {
+ nfsd_sync_dir(dentry);
+ /* setattr will sync the child (or not) */
+ }
+
+ /*
+ * Update the filehandle to get the new inode info.
+ */
+ err = fh_update(resfhp);
+ if (err)
+ goto out;
+
+ if (createmode == NFS3_CREATE_EXCLUSIVE) {
+ /* Cram the verifier into atime/mtime/mode */
+ iap->ia_valid = ATTR_MTIME|ATTR_ATIME
+ | ATTR_MTIME_SET|ATTR_ATIME_SET
+ | ATTR_MODE;
+ /* 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;
+ iap->ia_mode = v_mode;
+ }
+
+ /* Set file attributes.
+ * Mode has already been set but we might need to reset it
+ * for CREATE_EXCLUSIVE
+ * Irix appears to send along the gid when it tries to
+ * implement setgid directories via NFS. Clear out all that cruft.
+ */
+ set_attr:
+ if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID)) != 0)
+ err = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0);
+
+ out:
+ fh_unlock(fhp);
+ if (dchild && !IS_ERR(dchild))
+ dput(dchild);
+ return err;
+
+ out_nfserr:
+ err = nfserrno(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
+ */
+int
+nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp)
+{
+ struct dentry *dentry;
+ struct inode *inode;
+ mm_segment_t oldfs;
+ int err;
+
+ err = fh_verify(rqstp, fhp, S_IFLNK, MAY_NOP);
+ if (err)
+ goto out;
+
+ dentry = fhp->fh_dentry;
+ inode = dentry->d_inode;
+
+ err = nfserr_inval;
+ if (!inode->i_op || !inode->i_op->readlink)
+ goto out;
+
+ touch_atime(fhp->fh_export->ex_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);
+ err = inode->i_op->readlink(dentry, buf, *lenp);
+ set_fs(oldfs);
+
+ if (err < 0)
+ goto out_nfserr;
+ *lenp = err;
+ err = 0;
+out:
+ return err;
+
+out_nfserr:
+ err = nfserrno(err);
+ goto out;
+}
+
+/*
+ * Create a symlink and look up its inode
+ * N.B. After this call _both_ fhp and resfhp need an fh_put
+ */
+int
+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;
+ int err, cerr;
+ umode_t mode;
+
+ err = nfserr_noent;
+ if (!flen || !plen)
+ goto out;
+ err = nfserr_exist;
+ if (isdotent(fname, flen))
+ goto out;
+
+ err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE);
+ if (err)
+ goto out;
+ fh_lock(fhp);
+ dentry = fhp->fh_dentry;
+ dnew = lookup_one_len(fname, dentry, flen);
+ err = PTR_ERR(dnew);
+ if (IS_ERR(dnew))
+ goto out_nfserr;
+
+ mode = S_IALLUGO;
+ /* Only the MODE ATTRibute is even vaguely meaningful */
+ if (iap && (iap->ia_valid & ATTR_MODE))
+ mode = iap->ia_mode & S_IALLUGO;
+
+ if (unlikely(path[plen] != 0)) {
+ char *path_alloced = kmalloc(plen+1, GFP_KERNEL);
+ if (path_alloced == NULL)
+ err = -ENOMEM;
+ else {
+ strncpy(path_alloced, path, plen);
+ path_alloced[plen] = 0;
+ err = vfs_symlink(dentry->d_inode, dnew, path_alloced, mode);
+ kfree(path_alloced);
+ }
+ } else
+ err = vfs_symlink(dentry->d_inode, dnew, path, mode);
+
+ if (!err) {
+ if (EX_ISSYNC(fhp->fh_export))
+ nfsd_sync_dir(dentry);
+ } else
+ err = nfserrno(err);
+ fh_unlock(fhp);
+
+ cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp);
+ dput(dnew);
+ if (err==0) err = cerr;
+out:
+ return err;
+
+out_nfserr:
+ err = nfserrno(err);
+ goto out;
+}
+
+/*
+ * Create a hardlink
+ * N.B. After this call _both_ ffhp and tfhp need an fh_put
+ */
+int
+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;
+ int err;
+
+ err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_CREATE);
+ if (err)
+ goto out;
+ err = fh_verify(rqstp, tfhp, -S_IFDIR, MAY_NOP);
+ if (err)
+ goto out;
+
+ err = nfserr_perm;
+ if (!len)
+ goto out;
+ err = nfserr_exist;
+ if (isdotent(name, len))
+ goto out;
+
+ fh_lock(ffhp);
+ ddir = ffhp->fh_dentry;
+ dirp = ddir->d_inode;
+
+ dnew = lookup_one_len(name, ddir, len);
+ err = PTR_ERR(dnew);
+ if (IS_ERR(dnew))
+ goto out_nfserr;
+
+ dold = tfhp->fh_dentry;
+ dest = dold->d_inode;
+
+ err = vfs_link(dold, dirp, dnew);
+ if (!err) {
+ if (EX_ISSYNC(ffhp->fh_export)) {
+ nfsd_sync_dir(ddir);
+ write_inode_now(dest, 1);
+ }
+ } else {
+ if (err == -EXDEV && rqstp->rq_vers == 2)
+ err = nfserr_acces;
+ else
+ err = nfserrno(err);
+ }
+
+ fh_unlock(ffhp);
+ dput(dnew);
+out:
+ return err;
+
+out_nfserr:
+ err = nfserrno(err);
+ goto out;
+}
+
+/*
+ * Rename a file
+ * N.B. After this call _both_ ffhp and tfhp need an fh_put
+ */
+int
+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;
+ int err;
+
+ err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_REMOVE);
+ if (err)
+ goto out;
+ err = fh_verify(rqstp, tfhp, S_IFDIR, MAY_CREATE);
+ if (err)
+ goto out;
+
+ fdentry = ffhp->fh_dentry;
+ fdir = fdentry->d_inode;
+
+ tdentry = tfhp->fh_dentry;
+ tdir = tdentry->d_inode;
+
+ err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev;
+ if (fdir->i_sb != tdir->i_sb)
+ 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);
+ err = PTR_ERR(odentry);
+ if (IS_ERR(odentry))
+ goto out_nfserr;
+
+ err = -ENOENT;
+ if (!odentry->d_inode)
+ goto out_dput_old;
+ err = -EINVAL;
+ if (odentry == trap)
+ goto out_dput_old;
+
+ ndentry = lookup_one_len(tname, tdentry, tlen);
+ err = PTR_ERR(ndentry);
+ if (IS_ERR(ndentry))
+ goto out_dput_old;
+ err = -ENOTEMPTY;
+ if (ndentry == trap)
+ goto out_dput_new;
+
+#ifdef MSNFS
+ if ((ffhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
+ ((atomic_read(&odentry->d_count) > 1)
+ || (atomic_read(&ndentry->d_count) > 1))) {
+ err = nfserr_perm;
+ } else
+#endif
+ err = vfs_rename(fdir, odentry, tdir, ndentry);
+ if (!err && EX_ISSYNC(tfhp->fh_export)) {
+ nfsd_sync_dir(tdentry);
+ nfsd_sync_dir(fdentry);
+ }
+
+ out_dput_new:
+ dput(ndentry);
+ out_dput_old:
+ dput(odentry);
+ out_nfserr:
+ if (err)
+ err = nfserrno(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
+ */
+int
+nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
+ char *fname, int flen)
+{
+ struct dentry *dentry, *rdentry;
+ struct inode *dirp;
+ int err;
+
+ err = nfserr_acces;
+ if (!flen || isdotent(fname, flen))
+ goto out;
+ err = fh_verify(rqstp, fhp, S_IFDIR, MAY_REMOVE);
+ if (err)
+ goto out;
+
+ fh_lock(fhp);
+ dentry = fhp->fh_dentry;
+ dirp = dentry->d_inode;
+
+ rdentry = lookup_one_len(fname, dentry, flen);
+ 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;
+
+ if (type != S_IFDIR) { /* It's UNLINK */
+#ifdef MSNFS
+ if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
+ (atomic_read(&rdentry->d_count) > 1)) {
+ err = nfserr_perm;
+ } else
+#endif
+ err = vfs_unlink(dirp, rdentry);
+ } else { /* It's RMDIR */
+ err = vfs_rmdir(dirp, rdentry);
+ }
+
+ dput(rdentry);
+
+ if (err)
+ goto out_nfserr;
+ if (EX_ISSYNC(fhp->fh_export))
+ nfsd_sync_dir(dentry);
+
+out:
+ return err;
+
+out_nfserr:
+ err = nfserrno(err);
+ goto out;
+}
+
+/*
+ * Read entries from a directory.
+ * The NFSv3/4 verifier we ignore for now.
+ */
+int
+nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp,
+ struct readdir_cd *cdp, encode_dent_fn func)
+{
+ int err;
+ struct file *file;
+ loff_t offset = *offsetp;
+
+ err = nfsd_open(rqstp, fhp, S_IFDIR, MAY_READ, &file);
+ if (err)
+ goto out;
+
+ offset = vfs_llseek(file, offset, 0);
+ if (offset < 0) {
+ err = nfserrno((int)offset);
+ goto out_close;
+ }
+
+ /*
+ * Read the directory entries. This silly loop is necessary because
+ * readdir() is not guaranteed to fill up the entire buffer, but
+ * may choose to do less.
+ */
+
+ do {
+ cdp->err = nfserr_eof; /* will be cleared on successful read */
+ err = vfs_readdir(file, (filldir_t) func, cdp);
+ } while (err >=0 && cdp->err == nfs_ok);
+ if (err)
+ err = nfserrno(err);
+ else
+ err = cdp->err;
+ *offsetp = vfs_llseek(file, 0, 1);
+
+ if (err == nfserr_eof || err == nfserr_toosmall)
+ err = nfs_ok; /* can still be found in ->err */
+out_close:
+ nfsd_close(file);
+out:
+ return err;
+}
+
+/*
+ * Get file system stats
+ * N.B. After this call fhp needs an fh_put
+ */
+int
+nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat)
+{
+ int err = fh_verify(rqstp, fhp, 0, MAY_NOP);
+ if (!err && vfs_statfs(fhp->fh_dentry->d_inode->i_sb,stat))
+ err = nfserr_io;
+ return err;
+}
+
+/*
+ * Check for a user's access permissions to this inode.
+ */
+int
+nfsd_permission(struct svc_export *exp, struct dentry *dentry, int acc)
+{
+ struct inode *inode = dentry->d_inode;
+ int err;
+
+ if (acc == MAY_NOP)
+ return 0;
+#if 0
+ dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n",
+ acc,
+ (acc & MAY_READ)? " read" : "",
+ (acc & MAY_WRITE)? " write" : "",
+ (acc & MAY_EXEC)? " exec" : "",
+ (acc & MAY_SATTR)? " sattr" : "",
+ (acc & MAY_TRUNC)? " trunc" : "",
+ (acc & MAY_LOCK)? " lock" : "",
+ (acc & MAY_OWNER_OVERRIDE)? " owneroverride" : "",
+ inode->i_mode,
+ IS_IMMUTABLE(inode)? " immut" : "",
+ IS_APPEND(inode)? " append" : "",
+ IS_RDONLY(inode)? " ro" : "");
+ dprintk(" owner %d/%d user %d/%d\n",
+ inode->i_uid, inode->i_gid, current->fsuid, current->fsgid);
+#endif
+
+ /* Normally we reject any write/sattr etc access on a read-only file
+ * system. But if it is IRIX doing check on write-access for a
+ * device special file, we ignore rofs.
+ */
+ if (!(acc & MAY_LOCAL_ACCESS))
+ if (acc & (MAY_WRITE | MAY_SATTR | MAY_TRUNC)) {
+ if (EX_RDONLY(exp) || IS_RDONLY(inode))
+ return nfserr_rofs;
+ if (/* (acc & MAY_WRITE) && */ IS_IMMUTABLE(inode))
+ return nfserr_perm;
+ }
+ if ((acc & MAY_TRUNC) && IS_APPEND(inode))
+ return nfserr_perm;
+
+ if (acc & MAY_LOCK) {
+ /* If we cannot rely on authentication in NLM requests,
+ * just allow locks, otherwise require read permission, or
+ * ownership
+ */
+ if (exp->ex_flags & NFSEXP_NOAUTHNLM)
+ return 0;
+ else
+ acc = MAY_READ | MAY_OWNER_OVERRIDE;
+ }
+ /*
+ * The file owner always gets access permission for accesses that
+ * would normally be checked at open time. This is to make
+ * file access work even when the client has done a fchmod(fd, 0).
+ *
+ * However, `cp foo bar' should fail nevertheless when bar is
+ * readonly. A sensible way to do this might be to reject all
+ * attempts to truncate a read-only file, because a creat() call
+ * always implies file truncation.
+ * ... but this isn't really fair. A process may reasonably call
+ * ftruncate on an open file descriptor on a file with perm 000.
+ * We must trust the client to do permission checking - using "ACCESS"
+ * with NFSv3.
+ */
+ if ((acc & MAY_OWNER_OVERRIDE) &&
+ inode->i_uid == current->fsuid)
+ return 0;
+
+ err = permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC), NULL);
+
+ /* Allow read access to binaries even when mode 111 */
+ if (err == -EACCES && S_ISREG(inode->i_mode) &&
+ acc == (MAY_READ | MAY_OWNER_OVERRIDE))
+ err = permission(inode, MAY_EXEC, NULL);
+
+ return err? nfserrno(err) : 0;
+}
+
+void
+nfsd_racache_shutdown(void)
+{
+ if (!raparm_cache)
+ return;
+ dprintk("nfsd: freeing readahead buffers.\n");
+ kfree(raparml);
+ raparm_cache = raparml = NULL;
+}
+/*
+ * Initialize readahead param cache
+ */
+int
+nfsd_racache_init(int cache_size)
+{
+ int i;
+
+ if (raparm_cache)
+ return 0;
+ raparml = kmalloc(sizeof(struct raparms) * cache_size, GFP_KERNEL);
+
+ if (raparml != NULL) {
+ dprintk("nfsd: allocating %d readahead buffers.\n",
+ cache_size);
+ memset(raparml, 0, sizeof(struct raparms) * cache_size);
+ for (i = 0; i < cache_size - 1; i++) {
+ raparml[i].p_next = raparml + i + 1;
+ }
+ raparm_cache = raparml;
+ } else {
+ printk(KERN_WARNING
+ "nfsd: Could not allocate memory read-ahead cache.\n");
+ return -ENOMEM;
+ }
+ nfsdstats.ra_size = cache_size;
+ return 0;
+}