static long nfs42_fallocate(struct file *filep, int mode, loff_t offset, loff_t len)
{
struct inode *inode = file_inode(filep);
long ret;
if (!S_ISREG(inode->i_mode))
return -EOPNOTSUPP;
if ((mode != 0) && (mode != (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE)))
return -EOPNOTSUPP;
ret = inode_newsize_ok(inode, offset + len);
if (ret < 0)
return ret;
mutex_lock(&inode->i_mutex);
if (mode & FALLOC_FL_PUNCH_HOLE)
ret = nfs42_proc_deallocate(filep, offset, len);
else
ret = nfs42_proc_allocate(filep, offset, len);
mutex_unlock(&inode->i_mutex);
nfs_zap_caches(inode);
return ret;
}
/*
* Following a failed create operation, we drop the dentry rather
* than retain a negative dentry. This avoids a problem in the event
* that the operation succeeded on the server, but an error in the
* reply path made it appear to have failed.
*/
static int nfs_create(struct inode *dir, struct dentry *dentry, int mode)
{
struct iattr attr;
struct nfs_fattr fattr;
struct nfs_fh fhandle;
int error;
dfprintk(VFS, "NFS: create(%x/%ld, %s\n",
dir->i_dev, dir->i_ino, dentry->d_name.name);
attr.ia_mode = mode;
attr.ia_valid = ATTR_MODE;
/*
* The 0 argument passed into the create function should one day
* contain the O_EXCL flag if requested. This allows NFSv3 to
* select the appropriate create strategy. Currently open_namei
* does not pass the create flags.
*/
nfs_zap_caches(dir);
error = NFS_PROTO(dir)->create(dir, &dentry->d_name,
&attr, 0, &fhandle, &fattr);
if (!error)
error = nfs_instantiate(dentry, &fhandle, &fattr);
else
d_drop(dentry);
return error;
}
/*
* See comments for nfs_proc_create regarding failed operations.
*/
static int nfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
{
struct iattr attr;
struct nfs_fattr fattr;
struct nfs_fh fhandle;
int error;
dfprintk(VFS, "NFS: mkdir(%x/%ld, %s\n",
dir->i_dev, dir->i_ino, dentry->d_name.name);
attr.ia_valid = ATTR_MODE;
attr.ia_mode = mode | S_IFDIR;
#if 0
/*
* Always drop the dentry, we can't always depend on
* the fattr returned by the server (AIX seems to be
* broken). We're better off doing another lookup than
* depending on potentially bogus information.
*/
d_drop(dentry);
#endif
nfs_zap_caches(dir);
error = NFS_PROTO(dir)->mkdir(dir, &dentry->d_name, &attr, &fhandle,
&fattr);
if (!error)
error = nfs_instantiate(dentry, &fhandle, &fattr);
else
d_drop(dentry);
return error;
}
/*
* This is called every time the dcache has a lookup hit,
* and we should check whether we can really trust that
* lookup.
*
* NOTE! The hit can be a negative hit too, don't assume
* we have an inode!
*
* If the parent directory is seen to have changed, we throw out the
* cached dentry and do a new lookup.
*/
static int nfs_lookup_revalidate(struct dentry * dentry, int flags)
{
struct inode *dir;
struct inode *inode;
int error;
struct nfs_fh fhandle;
struct nfs_fattr fattr;
lock_kernel();
dir = dentry->d_parent->d_inode;
inode = dentry->d_inode;
if (!inode) {
if (nfs_neg_need_reval(dir, dentry))
goto out_bad;
goto out_valid;
}
if (is_bad_inode(inode)) {
dfprintk(VFS, "nfs_lookup_validate: %s/%s has dud inode\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
goto out_bad;
}
/* Force a full look up iff the parent directory has changed */
if (nfs_check_verifier(dir, dentry)) {
if (nfs_lookup_verify_inode(inode, flags))
goto out_bad;
goto out_valid;
}
if (NFS_STALE(inode))
goto out_bad;
error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, &fhandle, &fattr);
if (error)
goto out_bad;
if (memcmp(NFS_FH(inode), &fhandle, sizeof(struct nfs_fh))!= 0)
goto out_bad;
if ((error = nfs_refresh_inode(inode, &fattr)) != 0)
goto out_bad;
nfs_renew_times(dentry);
out_valid:
unlock_kernel();
return 1;
out_bad:
NFS_CACHEINV(dir);
if (inode && S_ISDIR(inode->i_mode)) {
/* Purge readdir caches. */
nfs_zap_caches(inode);
/* If we have submounts, don't unhash ! */
if (have_submounts(dentry))
goto out_valid;
shrink_dcache_parent(dentry);
}
d_drop(dentry);
unlock_kernel();
return 0;
}
static int do_setlk(struct file *filp, int cmd, struct file_lock *fl)
{
struct inode *inode = filp->f_mapping->host;
int status;
/*
* Flush all pending writes before doing anything
* with locks..
*/
status = nfs_sync_mapping(filp->f_mapping);
if (status != 0)
goto out;
/* Use local locking if mounted with "-onolock" */
if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM))
status = NFS_PROTO(inode)->lock(filp, cmd, fl);
else
status = do_vfs_lock(filp, fl);
if (status < 0)
goto out;
/*
* Make sure we clear the cache whenever we try to get the lock.
* This makes locking act as a cache coherency point.
*/
nfs_sync_mapping(filp->f_mapping);
if (!nfs_have_delegation(inode, FMODE_READ))
nfs_zap_caches(inode);
out:
return status;
}
/*
* Invalidate, but do not unhash, the inode
*/
static void
nfs_invalidate_inode(struct inode *inode)
{
umode_t save_mode = inode->i_mode;
make_bad_inode(inode);
inode->i_mode = save_mode;
nfs_inval(inode);
nfs_zap_caches(inode);
}
static int do_setlk(struct file *filp, int cmd, struct file_lock *fl)
{
struct inode *inode = filp->f_mapping->host;
sigset_t oldset;
int status;
rpc_clnt_sigmask(NFS_CLIENT(inode), &oldset);
/*
* Flush all pending writes before doing anything
* with locks..
*/
status = filemap_fdatawrite(filp->f_mapping);
if (status == 0) {
down(&inode->i_sem);
status = nfs_wb_all(inode);
up(&inode->i_sem);
if (status == 0)
status = filemap_fdatawait(filp->f_mapping);
}
if (status < 0)
goto out;
lock_kernel();
/* Use local locking if mounted with "-onolock" */
if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) {
status = NFS_PROTO(inode)->lock(filp, cmd, fl);
/* If we were signalled we still need to ensure that
* we clean up any state on the server. We therefore
* record the lock call as having succeeded in order to
* ensure that locks_remove_posix() cleans it out when
* the process exits.
*/
if (status == -EINTR || status == -ERESTARTSYS)
do_vfs_lock(filp, fl);
} else
status = do_vfs_lock(filp, fl);
unlock_kernel();
if (status < 0)
goto out;
/*
* Make sure we clear the cache whenever we try to get the lock.
* This makes locking act as a cache coherency point.
*/
filemap_fdatawrite(filp->f_mapping);
down(&inode->i_sem);
nfs_wb_all(inode); /* we may have slept */
up(&inode->i_sem);
filemap_fdatawait(filp->f_mapping);
nfs_zap_caches(inode);
out:
rpc_clnt_sigunmask(NFS_CLIENT(inode), &oldset);
return status;
}
static int nfs_rmdir(struct inode *dir, struct dentry *dentry)
{
int error;
dfprintk(VFS, "NFS: rmdir(%x/%ld, %s\n",
dir->i_dev, dir->i_ino, dentry->d_name.name);
nfs_zap_caches(dir);
error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name);
if (!error)
dentry->d_inode->i_nlink = 0;
return error;
}
/*
* Remove a file after making sure there are no pending writes,
* and after checking that the file has only one user.
*
* We invalidate the attribute cache and free the inode prior to the operation
* to avoid possible races if the server reuses the inode.
*/
static int nfs_safe_remove(struct dentry *dentry)
{
struct inode *dir = dentry->d_parent->d_inode;
struct inode *inode = dentry->d_inode;
int error = -EBUSY, rehash = 0;
dfprintk(VFS, "NFS: safe_remove(%s/%s)\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
/*
* Unhash the dentry while we remove the file ...
*/
if (!d_unhashed(dentry)) {
d_drop(dentry);
rehash = 1;
}
if (atomic_read(&dentry->d_count) > 1) {
#ifdef NFS_PARANOIA
printk("nfs_safe_remove: %s/%s busy, d_count=%d\n",
dentry->d_parent->d_name.name, dentry->d_name.name,
atomic_read(&dentry->d_count));
#endif
goto out;
}
/* If the dentry was sillyrenamed, we simply call d_delete() */
if (dentry->d_flags & DCACHE_NFSFS_RENAMED) {
error = 0;
goto out_delete;
}
nfs_zap_caches(dir);
if (inode)
NFS_CACHEINV(inode);
error = NFS_PROTO(dir)->remove(dir, &dentry->d_name);
if (error < 0)
goto out;
if (inode)
inode->i_nlink--;
out_delete:
/*
* Free the inode
*/
d_delete(dentry);
out:
if (rehash)
d_rehash(dentry);
return error;
}
static int
nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
{
struct iattr attr;
struct nfs_fattr sym_attr;
struct nfs_fh sym_fh;
struct qstr qsymname;
unsigned int maxlen;
int error;
dfprintk(VFS, "NFS: symlink(%x/%ld, %s, %s)\n",
dir->i_dev, dir->i_ino, dentry->d_name.name, symname);
error = -ENAMETOOLONG;
maxlen = (NFS_PROTO(dir)->version==2) ? NFS2_MAXPATHLEN : NFS3_MAXPATHLEN;
if (strlen(symname) > maxlen)
goto out;
#ifdef NFS_PARANOIA
if (dentry->d_inode)
printk("nfs_proc_symlink: %s/%s not negative!\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
#endif
/*
* Fill in the sattr for the call.
* Note: SunOS 4.1.2 crashes if the mode isn't initialized!
*/
attr.ia_valid = ATTR_MODE;
attr.ia_mode = S_IFLNK | S_IRWXUGO;
qsymname.name = symname;
qsymname.len = strlen(symname);
nfs_zap_caches(dir);
error = NFS_PROTO(dir)->symlink(dir, &dentry->d_name, &qsymname,
&attr, &sym_fh, &sym_attr);
if (!error) {
error = nfs_instantiate(dentry, &sym_fh, &sym_attr);
} else {
if (error == -EEXIST)
printk("nfs_proc_symlink: %s/%s already exists??\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
d_drop(dentry);
}
out:
return error;
}
static int do_setlk(struct file *filp, int cmd, struct file_lock *fl)
{
struct inode *inode = filp->f_mapping->host;
int status;
/*
* Flush all pending writes before doing anything
* with locks..
*/
status = filemap_fdatawrite(filp->f_mapping);
if (status == 0) {
down(&inode->i_sem);
status = nfs_wb_all(inode);
up(&inode->i_sem);
if (status == 0)
status = filemap_fdatawait(filp->f_mapping);
}
if (status < 0)
return status;
lock_kernel();
status = NFS_PROTO(inode)->lock(filp, cmd, fl);
/* If we were signalled we still need to ensure that
* we clean up any state on the server. We therefore
* record the lock call as having succeeded in order to
* ensure that locks_remove_posix() cleans it out when
* the process exits.
*/
if (status == -EINTR || status == -ERESTARTSYS)
posix_lock_file(filp, fl);
unlock_kernel();
if (status < 0)
return status;
/*
* Make sure we clear the cache whenever we try to get the lock.
* This makes locking act as a cache coherency point.
*/
filemap_fdatawrite(filp->f_mapping);
down(&inode->i_sem);
nfs_wb_all(inode); /* we may have slept */
up(&inode->i_sem);
filemap_fdatawait(filp->f_mapping);
nfs_zap_caches(inode);
return 0;
}
/* Now we cache directories properly, by stuffing the dirent
* data directly in the page cache.
*
* Inode invalidation due to refresh etc. takes care of
* _everything_, no sloppy entry flushing logic, no extraneous
* copying, network direct to page cache, the way it was meant
* to be.
*
* NOTE: Dirent information verification is done always by the
* page-in of the RPC reply, nowhere else, this simplies
* things substantially.
*/
static
int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page *page)
{
struct file *file = desc->file;
struct inode *inode = file->f_dentry->d_inode;
struct rpc_cred *cred = nfs_file_cred(file);
unsigned long timestamp;
int error;
dfprintk(VFS, "NFS: nfs_readdir_filler() reading cookie %Lu into page %lu.\n", (long long)desc->entry->cookie, page->index);
again:
timestamp = jiffies;
error = NFS_PROTO(inode)->readdir(file->f_dentry, cred, desc->entry->cookie, page,
NFS_SERVER(inode)->dtsize, desc->plus);
if (error < 0) {
/* We requested READDIRPLUS, but the server doesn't grok it */
if (error == -ENOTSUPP && desc->plus) {
NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS;
NFS_FLAGS(inode) &= ~NFS_INO_ADVISE_RDPLUS;
desc->plus = 0;
goto again;
}
goto error;
}
SetPageUptodate(page);
NFS_FLAGS(inode) |= NFS_INO_INVALID_ATIME;
/* Ensure consistent page alignment of the data.
* Note: assumes we have exclusive access to this mapping either
* throught inode->i_sem or some other mechanism.
*/
if (page->index == 0) {
invalidate_inode_pages(inode->i_mapping);
NFS_I(inode)->readdir_timestamp = timestamp;
}
unlock_page(page);
return 0;
error:
SetPageError(page);
unlock_page(page);
nfs_zap_caches(inode);
desc->error = error;
return -EIO;
}
static int
do_setlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
{
struct inode *inode = filp->f_mapping->host;
int status;
/*
* Flush all pending writes before doing anything
* with locks..
*/
status = nfs_sync_mapping(filp->f_mapping);
if (status != 0)
goto out;
/*
* Use local locking if mounted with "-onolock" or with appropriate
* "-olocal_lock="
*/
if (!is_local)
status = NFS_PROTO(inode)->lock(filp, cmd, fl);
else
status = do_vfs_lock(filp, fl);
if (status < 0)
goto out;
/*
* Revalidate the cache if the server has time stamps granular
* enough to detect subsecond changes. Otherwise, clear the
* cache to prevent missing any changes.
*
* This makes locking act as a cache coherency point.
*/
nfs_sync_mapping(filp->f_mapping);
if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) {
if (is_time_granular(&NFS_SERVER(inode)->time_delta))
__nfs_revalidate_inode(NFS_SERVER(inode), inode);
else
nfs_zap_caches(inode);
}
out:
return status;
}
static int
nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
{
struct inode *inode = old_dentry->d_inode;
int error;
dfprintk(VFS, "NFS: link(%s/%s -> %s/%s)\n",
old_dentry->d_parent->d_name.name, old_dentry->d_name.name,
dentry->d_parent->d_name.name, dentry->d_name.name);
/*
* Drop the dentry in advance to force a new lookup.
* Since nfs_proc_link doesn't return a file handle,
* we can't use the existing dentry.
*/
d_drop(dentry);
nfs_zap_caches(dir);
NFS_CACHEINV(inode);
error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name);
return error;
}
static int do_setlk(struct file *filp, int cmd, struct file_lock *fl)
{
struct inode *inode = filp->f_mapping->host;
int status;
/*
* Flush all pending writes before doing anything
* with locks..
*/
status = nfs_sync_mapping(filp->f_mapping);
if (status != 0)
goto out;
lock_kernel();
/* Use local locking if mounted with "-onolock" */
if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) {
status = NFS_PROTO(inode)->lock(filp, cmd, fl);
/* If we were signalled we still need to ensure that
* we clean up any state on the server. We therefore
* record the lock call as having succeeded in order to
* ensure that locks_remove_posix() cleans it out when
* the process exits.
*/
if (status == -EINTR || status == -ERESTARTSYS)
do_vfs_lock(filp, fl);
} else
status = do_vfs_lock(filp, fl);
unlock_kernel();
if (status < 0)
goto out;
/*
* Make sure we clear the cache whenever we try to get the lock.
* This makes locking act as a cache coherency point.
*/
nfs_sync_mapping(filp->f_mapping);
nfs_zap_caches(inode);
out:
return status;
}
/*
* See comments for nfs_proc_create regarding failed operations.
*/
static int nfs_mknod(struct inode *dir, struct dentry *dentry, int mode, int rdev)
{
struct iattr attr;
struct nfs_fattr fattr;
struct nfs_fh fhandle;
int error;
dfprintk(VFS, "NFS: mknod(%x/%ld, %s\n",
dir->i_dev, dir->i_ino, dentry->d_name.name);
attr.ia_mode = mode;
attr.ia_valid = ATTR_MODE;
nfs_zap_caches(dir);
error = NFS_PROTO(dir)->mknod(dir, &dentry->d_name, &attr, rdev,
&fhandle, &fattr);
if (!error)
error = nfs_instantiate(dentry, &fhandle, &fattr);
else
d_drop(dentry);
return error;
}
/*
* RENAME
* FIXME: Some nfsds, like the Linux user space nfsd, may generate a
* different file handle for the same inode after a rename (e.g. when
* moving to a different directory). A fail-safe method to do so would
* be to look up old_dir/old_name, create a link to new_dir/new_name and
* rename the old file using the sillyrename stuff. This way, the original
* file in old_dir will go away when the last process iput()s the inode.
*
* FIXED.
*
* It actually works quite well. One needs to have the possibility for
* at least one ".nfs..." file in each directory the file ever gets
* moved or linked to which happens automagically with the new
* implementation that only depends on the dcache stuff instead of
* using the inode layer
*
* Unfortunately, things are a little more complicated than indicated
* above. For a cross-directory move, we want to make sure we can get
* rid of the old inode after the operation. This means there must be
* no pending writes (if it's a file), and the use count must be 1.
* If these conditions are met, we can drop the dentries before doing
* the rename.
*/
static int nfs_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry)
{
struct inode *old_inode = old_dentry->d_inode;
struct inode *new_inode = new_dentry->d_inode;
struct dentry *dentry = NULL, *rehash = NULL;
int error = -EBUSY;
/*
* To prevent any new references to the target during the rename,
* we unhash the dentry and free the inode in advance.
*/
if (!d_unhashed(new_dentry)) {
d_drop(new_dentry);
rehash = new_dentry;
}
dfprintk(VFS, "NFS: rename(%s/%s -> %s/%s, ct=%d)\n",
old_dentry->d_parent->d_name.name, old_dentry->d_name.name,
new_dentry->d_parent->d_name.name, new_dentry->d_name.name,
atomic_read(&new_dentry->d_count));
/*
* First check whether the target is busy ... we can't
* safely do _any_ rename if the target is in use.
*
* For files, make a copy of the dentry and then do a
* silly-rename. If the silly-rename succeeds, the
* copied dentry is hashed and becomes the new target.
*/
if (!new_inode)
goto go_ahead;
if (S_ISDIR(new_inode->i_mode))
goto out;
else if (atomic_read(&new_dentry->d_count) > 1) {
int err;
/* copy the target dentry's name */
dentry = d_alloc(new_dentry->d_parent,
&new_dentry->d_name);
if (!dentry)
goto out;
/* silly-rename the existing target ... */
err = nfs_sillyrename(new_dir, new_dentry);
if (!err) {
new_dentry = rehash = dentry;
new_inode = NULL;
/* instantiate the replacement target */
d_instantiate(new_dentry, NULL);
}
/* dentry still busy? */
if (atomic_read(&new_dentry->d_count) > 1) {
#ifdef NFS_PARANOIA
printk("nfs_rename: target %s/%s busy, d_count=%d\n",
new_dentry->d_parent->d_name.name,
new_dentry->d_name.name,
atomic_read(&new_dentry->d_count));
#endif
goto out;
}
}
go_ahead:
/*
* ... prune child dentries and writebacks if needed.
*/
if (atomic_read(&old_dentry->d_count) > 1) {
nfs_wb_all(old_inode);
shrink_dcache_parent(old_dentry);
}
if (new_inode)
d_delete(new_dentry);
nfs_zap_caches(new_dir);
nfs_zap_caches(old_dir);
error = NFS_PROTO(old_dir)->rename(old_dir, &old_dentry->d_name,
new_dir, &new_dentry->d_name);
out:
if (rehash)
d_rehash(rehash);
if (!error && !S_ISDIR(old_inode->i_mode))
d_move(old_dentry, new_dentry);
/* new dentry created? */
if (dentry)
dput(dentry);
return error;
}
/*
* This is called every time the dcache has a lookup hit,
* and we should check whether we can really trust that
* lookup.
*
* NOTE! The hit can be a negative hit too, don't assume
* we have an inode!
*
* If the parent directory is seen to have changed, we throw out the
* cached dentry and do a new lookup.
*/
static int nfs_lookup_revalidate(struct dentry * dentry, struct nameidata *nd)
{
struct inode *dir;
struct inode *inode;
struct dentry *parent;
int error;
struct nfs_fh fhandle;
struct nfs_fattr fattr;
unsigned long verifier;
int isopen = 0;
parent = dget_parent(dentry);
lock_kernel();
dir = parent->d_inode;
inode = dentry->d_inode;
if (nd && !(nd->flags & LOOKUP_CONTINUE) && (nd->flags & LOOKUP_OPEN))
isopen = 1;
if (!inode) {
if (nfs_neg_need_reval(dir, dentry, nd))
goto out_bad;
goto out_valid;
}
if (is_bad_inode(inode)) {
dfprintk(VFS, "nfs_lookup_validate: %s/%s has dud inode\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
goto out_bad;
}
/* Revalidate parent directory attribute cache */
nfs_revalidate_inode(NFS_SERVER(dir), dir);
/* Force a full look up iff the parent directory has changed */
if (nfs_check_verifier(dir, dentry)) {
if (nfs_lookup_verify_inode(inode, isopen))
goto out_zap_parent;
goto out_valid;
}
/*
* Note: we're not holding inode->i_sem and so may be racing with
* operations that change the directory. We therefore save the
* change attribute *before* we do the RPC call.
*/
verifier = nfs_save_change_attribute(dir);
error = nfs_cached_lookup(dir, dentry, &fhandle, &fattr);
if (!error) {
if (memcmp(NFS_FH(inode), &fhandle, sizeof(struct nfs_fh))!= 0)
goto out_bad;
if (nfs_lookup_verify_inode(inode, isopen))
goto out_zap_parent;
goto out_valid_renew;
}
if (NFS_STALE(inode))
goto out_bad;
error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, &fhandle, &fattr);
if (error)
goto out_bad;
if (memcmp(NFS_FH(inode), &fhandle, sizeof(struct nfs_fh))!= 0)
goto out_bad;
if ((error = nfs_refresh_inode(inode, &fattr)) != 0)
goto out_bad;
out_valid_renew:
nfs_renew_times(dentry);
nfs_set_verifier(dentry, verifier);
out_valid:
unlock_kernel();
dput(parent);
return 1;
out_zap_parent:
nfs_zap_caches(dir);
out_bad:
NFS_CACHEINV(dir);
if (inode && S_ISDIR(inode->i_mode)) {
/* Purge readdir caches. */
nfs_zap_caches(inode);
/* If we have submounts, don't unhash ! */
if (have_submounts(dentry))
goto out_valid;
shrink_dcache_parent(dentry);
}
d_drop(dentry);
unlock_kernel();
dput(parent);
return 0;
}
static int nfs_sillyrename(struct inode *dir, struct dentry *dentry)
{
static unsigned int sillycounter;
const int i_inosize = sizeof(dir->i_ino)*2;
const int countersize = sizeof(sillycounter)*2;
const int slen = strlen(".nfs") + i_inosize + countersize;
char silly[slen+1];
struct qstr qsilly;
struct dentry *sdentry;
int error = -EIO;
dfprintk(VFS, "NFS: silly-rename(%s/%s, ct=%d)\n",
dentry->d_parent->d_name.name, dentry->d_name.name,
atomic_read(&dentry->d_count));
if (atomic_read(&dentry->d_count) == 1)
goto out; /* No need to silly rename. */
#ifdef NFS_PARANOIA
if (!dentry->d_inode)
printk("NFS: silly-renaming %s/%s, negative dentry??\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
#endif
/*
* We don't allow a dentry to be silly-renamed twice.
*/
error = -EBUSY;
if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
goto out;
sprintf(silly, ".nfs%*.*lx",
i_inosize, i_inosize, dentry->d_inode->i_ino);
sdentry = NULL;
do {
char *suffix = silly + slen - countersize;
dput(sdentry);
sillycounter++;
sprintf(suffix, "%*.*x", countersize, countersize, sillycounter);
dfprintk(VFS, "trying to rename %s to %s\n",
dentry->d_name.name, silly);
sdentry = lookup_one_len(silly, dentry->d_parent, slen);
/*
* N.B. Better to return EBUSY here ... it could be
* dangerous to delete the file while it's in use.
*/
if (IS_ERR(sdentry))
goto out;
} while(sdentry->d_inode != NULL); /* need negative lookup */
nfs_zap_caches(dir);
qsilly.name = silly;
qsilly.len = strlen(silly);
error = NFS_PROTO(dir)->rename(dir, &dentry->d_name, dir, &qsilly);
if (!error) {
nfs_renew_times(dentry);
d_move(dentry, sdentry);
error = nfs_async_unlink(dentry);
/* If we return 0 we don't unlink */
}
dput(sdentry);
out:
return error;
}
/*
* Lock a (portion of) a file
*/
int
nfs_lock(struct file *filp, int cmd, struct file_lock *fl)
{
struct inode * inode = filp->f_dentry->d_inode;
int status = 0;
dprintk("NFS: nfs_lock(f=%4x/%ld, t=%x, fl=%x, r=%Ld:%Ld)\n",
inode->i_dev, inode->i_ino,
fl->fl_type, fl->fl_flags,
(long long)fl->fl_start, (long long)fl->fl_end);
if (!inode)
return -EINVAL;
/* No mandatory locks over NFS */
if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
return -ENOLCK;
/* Fake OK code if mounted without NLM support */
if (NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM) {
if (cmd == F_GETLK)
status = LOCK_USE_CLNT;
goto out_ok;
}
/*
* No BSD flocks over NFS allowed.
* Note: we could try to fake a POSIX lock request here by
* using ((u32) filp | 0x80000000) or some such as the pid.
* Not sure whether that would be unique, though, or whether
* that would break in other places.
*/
if (!fl->fl_owner || (fl->fl_flags & (FL_POSIX|FL_BROKEN)) != FL_POSIX)
return -ENOLCK;
/*
* Flush all pending writes before doing anything
* with locks..
*/
down(&filp->f_dentry->d_inode->i_sem);
status = nfs_wb_all(inode);
up(&filp->f_dentry->d_inode->i_sem);
if (status < 0)
return status;
if ((status = nlmclnt_proc(inode, cmd, fl)) < 0)
return status;
else
status = 0;
/*
* Make sure we clear the cache whenever we try to get the lock.
* This makes locking act as a cache coherency point.
*/
out_ok:
if ((cmd == F_SETLK || cmd == F_SETLKW) && fl->fl_type != F_UNLCK) {
down(&filp->f_dentry->d_inode->i_sem);
nfs_wb_all(inode); /* we may have slept */
nfs_zap_caches(inode);
up(&filp->f_dentry->d_inode->i_sem);
}
return status;
}
/* The file offset position is now represented as a true offset into the
* page cache as is the case in most of the other filesystems.
*/
static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
struct dentry *dentry = filp->f_dentry;
struct inode *inode = dentry->d_inode;
nfs_readdir_descriptor_t my_desc,
*desc = &my_desc;
struct nfs_entry my_entry;
struct nfs_fh fh;
struct nfs_fattr fattr;
long res;
lock_kernel();
res = nfs_revalidate_inode(NFS_SERVER(inode), inode);
if (res < 0) {
unlock_kernel();
return res;
}
/*
* filp->f_pos points to the file offset in the page cache.
* but if the cache has meanwhile been zapped, we need to
* read from the last dirent to revalidate f_pos
* itself.
*/
memset(desc, 0, sizeof(*desc));
desc->file = filp;
desc->target = filp->f_pos;
desc->decode = NFS_PROTO(inode)->decode_dirent;
desc->plus = NFS_USE_READDIRPLUS(inode);
my_entry.cookie = my_entry.prev_cookie = 0;
my_entry.eof = 0;
my_entry.fh = &fh;
my_entry.fattr = &fattr;
desc->entry = &my_entry;
while(!desc->entry->eof) {
res = readdir_search_pagecache(desc);
if (res == -EBADCOOKIE) {
/* This means either end of directory */
if (desc->entry->cookie != desc->target) {
/* Or that the server has 'lost' a cookie */
res = uncached_readdir(desc, dirent, filldir);
if (res >= 0)
continue;
}
res = 0;
break;
}
if (res == -ETOOSMALL && desc->plus) {
NFS_FLAGS(inode) &= ~NFS_INO_ADVISE_RDPLUS;
nfs_zap_caches(inode);
desc->plus = 0;
desc->entry->eof = 0;
continue;
}
if (res < 0)
break;
res = nfs_do_filldir(desc, dirent, filldir);
if (res < 0) {
res = 0;
break;
}
}
unlock_kernel();
if (desc->error < 0)
return desc->error;
if (res < 0)
return res;
return 0;
}