#include <linux/pagemap.h>
#include <linux/smp_lock.h>
#include <linux/namei.h>
+#include <linux/vserver/xid.h>
+
+#include "delegation.h"
#define NFS_PARANOIA 1
/* #define NFS_DEBUG_VERBOSE 1 */
static int nfs_opendir(struct inode *, struct file *);
static int nfs_readdir(struct file *, void *, filldir_t);
static struct dentry *nfs_lookup(struct inode *, struct dentry *, struct nameidata *);
-static int nfs_cached_lookup(struct inode *, struct dentry *,
- struct nfs_fh *, struct nfs_fattr *);
static int nfs_create(struct inode *, struct dentry *, int, struct nameidata *);
static int nfs_mkdir(struct inode *, struct dentry *, int);
static int nfs_rmdir(struct inode *, struct dentry *);
static int nfs_mknod(struct inode *, struct dentry *, int, dev_t);
static int nfs_rename(struct inode *, struct dentry *,
struct inode *, struct dentry *);
+static int nfs_fsync_dir(struct file *, struct dentry *, int);
struct file_operations nfs_dir_operations = {
.read = generic_read_dir,
.readdir = nfs_readdir,
.open = nfs_opendir,
.release = nfs_release,
+ .fsync = nfs_fsync_dir,
};
struct inode_operations nfs_dir_inode_operations = {
return res;
}
-static unsigned int nfs_type2dtype[] = {
- DT_UNKNOWN,
- DT_REG,
- DT_DIR,
- DT_BLK,
- DT_CHR,
- DT_LNK,
- DT_SOCK,
- DT_UNKNOWN,
- DT_FIFO
-};
-
-static inline
-unsigned int nfs_type_to_d_type(enum nfs_ftype type)
+static inline unsigned int dt_type(struct inode *inode)
{
- return nfs_type2dtype[type];
+ return (inode->i_mode >> 12) & 15;
}
+static struct dentry *nfs_readdir_lookup(nfs_readdir_descriptor_t *desc);
+
/*
* Once we've found the start of the dirent within a page: fill 'er up...
*/
{
struct file *file = desc->file;
struct nfs_entry *entry = desc->entry;
+ struct dentry *dentry = NULL;
unsigned long fileid;
int loop_count = 0,
res;
* retrieving the current dirent on the server */
fileid = nfs_fileid_to_ino_t(entry->ino);
+ /* Get a dentry if we have one */
+ if (dentry != NULL)
+ dput(dentry);
+ dentry = nfs_readdir_lookup(desc);
+
/* Use readdirplus info */
- if (desc->plus && (entry->fattr->valid & NFS_ATTR_FATTR))
- d_type = nfs_type_to_d_type(entry->fattr->type);
+ if (dentry != NULL && dentry->d_inode != NULL) {
+ d_type = dt_type(dentry->d_inode);
+ fileid = dentry->d_inode->i_ino;
+ }
res = filldir(dirent, entry->name, entry->len,
entry->prev_cookie, fileid, d_type);
}
}
dir_page_release(desc);
-
+ if (dentry != NULL)
+ dput(dentry);
dfprintk(VFS, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n", (long long)desc->target, res);
return res;
}
return 0;
}
+/*
+ * All directory operations under NFS are synchronous, so fsync()
+ * is a dummy operation.
+ */
+int nfs_fsync_dir(struct file *filp, struct dentry *dentry, int datasync)
+{
+ return 0;
+}
+
/*
* A check for whether or not the parent directory has changed.
* In the case it has, we assume that the dentries are untrustworthy
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;
+ verifier = nfs_save_change_attribute(dir);
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)
+ if (nfs_compare_fh(NFS_FH(inode), &fhandle))
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:
static struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
{
+ struct dentry *res;
struct inode *inode = NULL;
int error;
struct nfs_fh fhandle;
dfprintk(VFS, "NFS: lookup(%s/%s)\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
- error = -ENAMETOOLONG;
+ res = ERR_PTR(-ENAMETOOLONG);
if (dentry->d_name.len > NFS_SERVER(dir)->namelen)
goto out;
- error = -ENOMEM;
+ res = ERR_PTR(-ENOMEM);
dentry->d_op = NFS_PROTO(dir)->dentry_ops;
lock_kernel();
if (nfs_is_exclusive_create(dir, nd))
goto no_entry;
- error = nfs_cached_lookup(dir, dentry, &fhandle, &fattr);
- if (error != 0) {
- error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name,
- &fhandle, &fattr);
- if (error == -ENOENT)
- goto no_entry;
- if (error != 0)
- goto out_unlock;
+ error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, &fhandle, &fattr);
+ if (error == -ENOENT)
+ goto no_entry;
+ if (error < 0) {
+ res = ERR_PTR(error);
+ goto out_unlock;
}
- error = -EACCES;
+ res = ERR_PTR(-EACCES);
inode = nfs_fhget(dentry->d_sb, &fhandle, &fattr);
if (!inode)
goto out_unlock;
+ vx_propagate_xid(nd, inode);
no_entry:
- error = 0;
- d_add(dentry, inode);
+ res = d_add_unique(dentry, inode);
+ if (res != NULL)
+ dentry = res;
nfs_renew_times(dentry);
nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
out_unlock:
unlock_kernel();
out:
- BUG_ON(error > 0);
- return ERR_PTR(error);
+ return res;
}
#ifdef CONFIG_NFS_V4
static struct dentry *nfs_atomic_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
{
+ struct dentry *res = NULL;
struct inode *inode = NULL;
- int error = 0;
/* Check that we are indeed trying to open this file */
if (!is_atomic_open(dir, nd))
goto no_open;
if (dentry->d_name.len > NFS_SERVER(dir)->namelen) {
- error = -ENAMETOOLONG;
+ res = ERR_PTR(-ENAMETOOLONG);
goto out;
}
dentry->d_op = NFS_PROTO(dir)->dentry_ops;
inode = nfs4_atomic_open(dir, dentry, nd);
unlock_kernel();
if (IS_ERR(inode)) {
- error = PTR_ERR(inode);
+ int error = PTR_ERR(inode);
switch (error) {
/* Make a negative dentry */
case -ENOENT:
/* case -EISDIR: */
/* case -EINVAL: */
default:
+ res = ERR_PTR(error);
goto out;
}
}
no_entry:
- d_add(dentry, inode);
+ res = d_add_unique(dentry, inode);
+ if (res != NULL)
+ dentry = res;
nfs_renew_times(dentry);
nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
out:
- BUG_ON(error > 0);
- return ERR_PTR(error);
+ return res;
no_open:
return nfs_lookup(dir, dentry, nd);
}
unsigned long verifier;
int openflags, ret = 0;
- /* NFS only supports OPEN for regular files */
- if (inode && !S_ISREG(inode->i_mode))
- goto no_open;
parent = dget_parent(dentry);
dir = parent->d_inode;
if (!is_atomic_open(dir, nd))
goto no_open;
+ /* We can't create new files in nfs_open_revalidate(), so we
+ * optimize away revalidation of negative dentries.
+ */
+ if (inode == NULL)
+ goto out;
+ /* NFS only supports OPEN on regular files */
+ if (!S_ISREG(inode->i_mode))
+ goto no_open;
openflags = nd->intent.open.flags;
- if (openflags & O_CREAT) {
- /* If this is a negative dentry, just drop it */
- if (!inode)
- goto out;
- /* If this is exclusive open, just revalidate */
- if (openflags & O_EXCL)
- goto no_open;
- }
+ /* We cannot do exclusive creation on a positive dentry */
+ if ((openflags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL))
+ goto no_open;
/* We can't create new files, or truncate existing ones here */
openflags &= ~(O_CREAT|O_TRUNC);
return ret;
no_open:
dput(parent);
+ if (inode != NULL && nfs_have_delegation(inode, FMODE_READ))
+ return 1;
return nfs_lookup_revalidate(dentry, nd);
}
#endif /* CONFIG_NFSV4 */
-static inline
-int find_dirent_name(nfs_readdir_descriptor_t *desc, struct page *page, struct dentry *dentry)
+static struct dentry *nfs_readdir_lookup(nfs_readdir_descriptor_t *desc)
{
+ struct dentry *parent = desc->file->f_dentry;
+ struct inode *dir = parent->d_inode;
struct nfs_entry *entry = desc->entry;
- int status;
-
- while((status = dir_decode(desc)) == 0) {
- if (entry->len != dentry->d_name.len)
- continue;
- if (memcmp(entry->name, dentry->d_name.name, entry->len))
- continue;
- if (!(entry->fattr->valid & NFS_ATTR_FATTR))
- continue;
- break;
- }
- return status;
-}
-
-/*
- * Use the cached Readdirplus results in order to avoid a LOOKUP call
- * whenever we believe that the parent directory has not changed.
- *
- * We assume that any file creation/rename changes the directory mtime.
- * As this results in a page cache invalidation whenever it occurs,
- * we don't require any other tests for cache coherency.
- */
-static
-int nfs_cached_lookup(struct inode *dir, struct dentry *dentry,
- struct nfs_fh *fh, struct nfs_fattr *fattr)
-{
- nfs_readdir_descriptor_t desc;
- struct nfs_server *server;
- struct nfs_entry entry;
- struct page *page;
- unsigned long timestamp;
- int res;
-
- if (!NFS_USE_READDIRPLUS(dir))
- return -ENOENT;
- server = NFS_SERVER(dir);
- /* Don't use readdirplus unless the cache is stable */
- if ((server->flags & NFS_MOUNT_NOAC) != 0
- || nfs_caches_unstable(dir)
- || nfs_attribute_timeout(dir))
- return -ENOENT;
- if ((NFS_FLAGS(dir) & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA)) != 0)
- return -ENOENT;
- timestamp = NFS_I(dir)->readdir_timestamp;
-
- entry.fh = fh;
- entry.fattr = fattr;
-
- desc.decode = NFS_PROTO(dir)->decode_dirent;
- desc.entry = &entry;
- desc.page_index = 0;
- desc.plus = 1;
-
- for(;(page = find_get_page(dir->i_mapping, desc.page_index)); desc.page_index++) {
-
- res = -EIO;
- if (PageUptodate(page)) {
- void * kaddr = kmap_atomic(page, KM_USER0);
- desc.ptr = kaddr;
- res = find_dirent_name(&desc, page, dentry);
- kunmap_atomic(kaddr, KM_USER0);
- }
- page_cache_release(page);
+ struct dentry *dentry, *alias;
+ struct qstr name = {
+ .name = entry->name,
+ .len = entry->len,
+ };
+ struct inode *inode;
- if (res == 0)
- goto out_found;
- if (res != -EAGAIN)
+ switch (name.len) {
+ case 2:
+ if (name.name[0] == '.' && name.name[1] == '.')
+ return dget_parent(parent);
break;
+ case 1:
+ if (name.name[0] == '.')
+ return dget(parent);
}
- return -ENOENT;
- out_found:
- fattr->timestamp = timestamp;
- return 0;
+ name.hash = full_name_hash(name.name, name.len);
+ dentry = d_lookup(parent, &name);
+ if (dentry != NULL)
+ return dentry;
+ if (!desc->plus || !(entry->fattr->valid & NFS_ATTR_FATTR))
+ return NULL;
+ /* Note: caller is already holding the dir->i_sem! */
+ dentry = d_alloc(parent, &name);
+ if (dentry == NULL)
+ return NULL;
+ dentry->d_op = NFS_PROTO(dir)->dentry_ops;
+ inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr);
+ if (!inode) {
+ dput(dentry);
+ return NULL;
+ }
+ alias = d_add_unique(dentry, inode);
+ if (alias != NULL) {
+ dput(dentry);
+ dentry = alias;
+ }
+ nfs_renew_times(dentry);
+ nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
+ return dentry;
}
/*
/* We may have been initialized further down */
if (dentry->d_inode)
return 0;
- if (fhandle->size == 0 || !(fattr->valid & NFS_ATTR_FATTR)) {
+ if (fhandle->size == 0) {
struct inode *dir = dentry->d_parent->d_inode;
error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr);
if (error)
goto out_err;
}
+ if (!(fattr->valid & NFS_ATTR_FATTR)) {
+ struct nfs_server *server = NFS_SB(dentry->d_sb);
+ error = server->rpc_ops->getattr(server, fhandle, fattr);
+ if (error < 0)
+ goto out_err;
+ }
inode = nfs_fhget(dentry->d_sb, fhandle, fattr);
if (inode) {
d_instantiate(dentry, inode);
if (nd && (nd->flags & LOOKUP_CREATE))
open_flags = nd->intent.open.flags;
- /*
- * 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.
- */
lock_kernel();
nfs_begin_data_update(dir);
- inode = NFS_PROTO(dir)->create(dir, &dentry->d_name, &attr, open_flags);
+ inode = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags);
nfs_end_data_update(dir);
if (!IS_ERR(inode)) {
d_instantiate(dentry, inode);
dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s)\n", dir->i_sb->s_id,
dir->i_ino, dentry->d_name.name, symname);
- error = -ENAMETOOLONG;
- switch (NFS_PROTO(dir)->version) {
- case 2:
- if (strlen(symname) > NFS2_MAXPATHLEN)
- goto out;
- break;
- case 3:
- if (strlen(symname) > NFS3_MAXPATHLEN)
- goto out;
- default:
- break;
- }
-
#ifdef NFS_PARANOIA
if (dentry->d_inode)
printk("nfs_proc_symlink: %s/%s not negative!\n",
d_drop(dentry);
}
unlock_kernel();
-
-out:
return error;
}
goto go_ahead;
if (S_ISDIR(new_inode->i_mode))
goto out;
- else if (atomic_read(&new_dentry->d_count) > 1) {
+ else if (atomic_read(&new_dentry->d_count) > 2) {
int err;
/* copy the target dentry's name */
dentry = d_alloc(new_dentry->d_parent,
new_inode = NULL;
/* instantiate the replacement target */
d_instantiate(new_dentry, NULL);
- }
-
+ } else if (atomic_read(&new_dentry->d_count) > 1) {
/* 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,
return error;
}
-int
-nfs_permission(struct inode *inode, int mask, struct nameidata *nd)
+int nfs_access_get_cached(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res)
+{
+ struct nfs_access_entry *cache = &NFS_I(inode)->cache_access;
+
+ if (cache->cred != cred
+ || time_after(jiffies, cache->jiffies + NFS_ATTRTIMEO(inode))
+ || (NFS_FLAGS(inode) & NFS_INO_INVALID_ACCESS))
+ return -ENOENT;
+ memcpy(res, cache, sizeof(*res));
+ return 0;
+}
+
+void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set)
+{
+ struct nfs_access_entry *cache = &NFS_I(inode)->cache_access;
+
+ if (cache->cred != set->cred) {
+ if (cache->cred)
+ put_rpccred(cache->cred);
+ cache->cred = get_rpccred(set->cred);
+ NFS_FLAGS(inode) &= ~NFS_INO_INVALID_ACCESS;
+ }
+ cache->jiffies = set->jiffies;
+ cache->mask = set->mask;
+}
+
+static int nfs_do_access(struct inode *inode, struct rpc_cred *cred, int mask)
+{
+ struct nfs_access_entry cache;
+ int status;
+
+ status = nfs_access_get_cached(inode, cred, &cache);
+ if (status == 0)
+ goto out;
+
+ /* Be clever: ask server to check for all possible rights */
+ cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
+ cache.cred = cred;
+ cache.jiffies = jiffies;
+ status = NFS_PROTO(inode)->access(inode, &cache);
+ if (status != 0)
+ return status;
+ nfs_access_add_cache(inode, &cache);
+out:
+ if ((cache.mask & mask) == mask)
+ return 0;
+ return -EACCES;
+}
+
+int nfs_permission(struct inode *inode, int mask, struct nameidata *nd)
{
- struct nfs_access_cache *cache = &NFS_I(inode)->cache_access;
struct rpc_cred *cred;
- int mode = inode->i_mode;
int res;
if (mask == 0)
return 0;
- if (mask & MAY_WRITE) {
- /*
- *
- * Nobody gets write access to a read-only fs.
- *
- */
- if (IS_RDONLY(inode) &&
- (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)))
- return -EROFS;
- /*
- *
- * Nobody gets write access to an immutable file.
- *
- */
- if (IS_IMMUTABLE(inode))
- return -EACCES;
- }
/* Are we checking permissions on anything other than lookup/execute? */
if ((mask & MAY_EXEC) == 0) {
/* We only need to check permissions on file open() and access() */
goto out_notsup;
cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
- if (cache->cred == cred
- && time_before(jiffies, cache->jiffies + NFS_ATTRTIMEO(inode))
- && !(NFS_FLAGS(inode) & NFS_INO_INVALID_ATTR)) {
- if (!(res = cache->err)) {
- /* Is the mask a subset of an accepted mask? */
- if ((cache->mask & mask) == mask)
- goto out;
- } else {
- /* ...or is it a superset of a rejected mask? */
- if ((cache->mask & mask) == cache->mask)
- goto out;
- }
- }
-
- res = NFS_PROTO(inode)->access(inode, cred, mask);
- if (!res || res == -EACCES)
- goto add_cache;
-out:
+ res = nfs_do_access(inode, cred, mask);
put_rpccred(cred);
unlock_kernel();
return res;
out_notsup:
nfs_revalidate_inode(NFS_SERVER(inode), inode);
- res = vfs_permission(inode, mask);
- unlock_kernel();
- return res;
-add_cache:
- cache->jiffies = jiffies;
- if (cache->cred)
- put_rpccred(cache->cred);
- cache->cred = cred;
- cache->mask = mask;
- cache->err = res;
+ res = generic_permission(inode, mask, NULL);
unlock_kernel();
return res;
}
git://git.onelab.eu / linux-2.6.git / blobdiff