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kernel-ark/fs/nfsd/vfs.c
NeilBrown 15b7a1b86d [PATCH] knfsd: fix setattr-on-symlink error return 
This is a somewhat cosmetic fix to keep the SpecFS validation test from
complaining.

SpecFS want's to try chmod on symlinks, and ext3 and reiser (at least) return
ENOTSUPP.

Probably both sides are being silly, but it is easiest to simply make it a
non-issue and filter out chmod requests on symlinks at the nfsd level.

Signed-off-by: Olaf Kirch <okir@suse.de>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-07 07:53:47 -08:00

1970 lines
46 KiB
C
Raw Blame History

#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/fsnotify.h>
#include <linux/posix_acl.h>
#include <linux/posix_acl_xattr.h>
#ifdef CONFIG_NFSD_V4
#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)
goto out;
dentry = fhp->fh_dentry;
inode = dentry->d_inode;
/* Ignore any mode updates on symlinks */
if (S_ISLNK(inode->i_mode))
iap->ia_valid &= ~ATTR_MODE;
if (!iap->ia_valid)
goto out;
/* 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, POSIX_ACL_XATTR_ACCESS);
if (error < 0)
goto out_nfserr;
}
if (dpacl) {
error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_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, 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, 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);
}
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;
fsnotify_access(file->f_dentry);
} 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;
fsnotify_modify(file->f_dentry);
}
/* 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;
}
#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) || !inode->i_op || !inode->i_op->getxattr)
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 = inode->i_op->getxattr(fhp->fh_dentry, name, NULL, 0);
if (size < 0) {
acl = ERR_PTR(size);
goto getout;
} else if (size > 0) {
value = kmalloc(size, GFP_KERNEL);
if (!value) {
acl = ERR_PTR(-ENOMEM);
goto getout;
}
size = inode->i_op->getxattr(fhp->fh_dentry, name, value, size);
if (size < 0) {
acl = ERR_PTR(size);
goto getout;
}
}
acl = posix_acl_from_xattr(value, size);
getout:
kfree(value);
return acl;
}
int
nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl)
{
struct inode *inode = fhp->fh_dentry->d_inode;
char *name;
void *value = NULL;
size_t size;
int error;
if (!IS_POSIXACL(inode) || !inode->i_op ||
!inode->i_op->setxattr || !inode->i_op->removexattr)
return -EOPNOTSUPP;
switch(type) {
case ACL_TYPE_ACCESS:
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;
size = posix_acl_to_xattr(acl, value, size);
if (size < 0) {
error = size;
goto getout;
}
} else
size = 0;
if (!fhp->fh_locked)
fh_lock(fhp); /* unlocking is done automatically */
if (size)
error = inode->i_op->setxattr(fhp->fh_dentry, name,
value, size, 0);
else {
if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT)
error = 0;
else {
error = inode->i_op->removexattr(fhp->fh_dentry, name);
if (error == -ENODATA)
error = 0;
}
}
getout:
kfree(value);
return error;
}
#endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */
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