#include <linux/mount.h>
#include <linux/sched.h>
#include <linux/vmalloc.h>
+#include <linux/kmemleak.h>
#include "delegation.h"
#include "iostat.h"
static
struct nfs_cache_array *nfs_readdir_get_array(struct page *page)
{
+ void *ptr;
if (page == NULL)
return ERR_PTR(-EIO);
- return (struct nfs_cache_array *)kmap(page);
+ ptr = kmap(page);
+ if (ptr == NULL)
+ return ERR_PTR(-ENOMEM);
+ return ptr;
}
static
{
struct nfs_cache_array *array = nfs_readdir_get_array(page);
int i;
+
+ if (IS_ERR(array))
+ return PTR_ERR(array);
for (i = 0; i < array->size; i++)
kfree(array->array[i].string.name);
nfs_readdir_release_array(page);
string->name = kmemdup(name, len, GFP_KERNEL);
if (string->name == NULL)
return -ENOMEM;
+ /*
+ * Avoid a kmemleak false positive. The pointer to the name is stored
+ * in a page cache page which kmemleak does not scan.
+ */
+ kmemleak_not_leak(string->name);
string->hash = full_name_hash(name, len);
return 0;
}
if (IS_ERR(array))
return PTR_ERR(array);
- ret = -EIO;
+ ret = -ENOSPC;
if (array->size >= MAX_READDIR_ARRAY)
goto out;
if (ret)
goto out;
array->last_cookie = entry->cookie;
+ array->size++;
if (entry->eof == 1)
array->eof_index = array->size;
- array->size++;
out:
nfs_readdir_release_array(page);
return ret;
if (diff < 0)
goto out_eof;
if (diff >= array->size) {
- if (array->eof_index > 0)
+ if (array->eof_index >= 0)
goto out_eof;
desc->current_index += array->size;
return -EAGAIN;
index = (unsigned int)diff;
*desc->dir_cookie = array->array[index].cookie;
desc->cache_entry_index = index;
- if (index == array->eof_index)
- desc->eof = 1;
return 0;
out_eof:
desc->eof = 1;
int status = -EAGAIN;
for (i = 0; i < array->size; i++) {
- if (i == array->eof_index) {
- desc->eof = 1;
- status = -EBADCOOKIE;
- }
if (array->array[i].cookie == *desc->dir_cookie) {
desc->cache_entry_index = i;
status = 0;
- break;
+ goto out;
}
}
-
+ if (i == array->eof_index) {
+ desc->eof = 1;
+ status = -EBADCOOKIE;
+ }
+out:
return status;
}
/* Perform conversion from xdr to cache array */
static
-void nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry,
+int nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry,
void *xdr_page, struct page *page, unsigned int buflen)
{
struct xdr_stream stream;
struct xdr_buf buf;
__be32 *ptr = xdr_page;
- int status;
struct nfs_cache_array *array;
+ unsigned int count = 0;
+ int status;
buf.head->iov_base = xdr_page;
buf.head->iov_len = buflen;
do {
status = xdr_decode(desc, entry, &stream);
- if (status != 0)
+ if (status != 0) {
+ if (status == -EAGAIN)
+ status = 0;
break;
+ }
+
+ count++;
- if (nfs_readdir_add_to_array(entry, page) == -1)
- break;
if (desc->plus == 1)
nfs_prime_dcache(desc->file->f_path.dentry, entry);
+
+ status = nfs_readdir_add_to_array(entry, page);
+ if (status != 0)
+ break;
} while (!entry->eof);
- if (status == -EBADCOOKIE && entry->eof) {
+ if (count == 0 || (status == -EBADCOOKIE && entry->eof == 1)) {
array = nfs_readdir_get_array(page);
- array->eof_index = array->size - 1;
- status = 0;
- nfs_readdir_release_array(page);
+ if (!IS_ERR(array)) {
+ array->eof_index = array->size;
+ status = 0;
+ nfs_readdir_release_array(page);
+ } else
+ status = PTR_ERR(array);
}
+ return status;
}
static
struct nfs_entry entry;
struct file *file = desc->file;
struct nfs_cache_array *array;
- int status = 0;
+ int status = -ENOMEM;
unsigned int array_size = ARRAY_SIZE(pages);
entry.prev_cookie = 0;
goto out;
array = nfs_readdir_get_array(page);
+ if (IS_ERR(array)) {
+ status = PTR_ERR(array);
+ goto out;
+ }
memset(array, 0, sizeof(struct nfs_cache_array));
array->eof_index = -1;
if (!pages_ptr)
goto out_release_array;
do {
+ unsigned int pglen;
status = nfs_readdir_xdr_filler(pages, desc, &entry, file, inode);
if (status < 0)
break;
- nfs_readdir_page_filler(desc, &entry, pages_ptr, page, array_size * PAGE_SIZE);
- } while (array->eof_index < 0 && array->size < MAX_READDIR_ARRAY);
+ pglen = status;
+ status = nfs_readdir_page_filler(desc, &entry, pages_ptr, page, pglen);
+ if (status < 0) {
+ if (status == -ENOSPC)
+ status = 0;
+ break;
+ }
+ } while (array->eof_index < 0);
nfs_readdir_free_large_page(pages_ptr, pages, array_size);
out_release_array:
int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page* page)
{
struct inode *inode = desc->file->f_path.dentry->d_inode;
+ int ret;
- if (nfs_readdir_xdr_to_array(desc, page, inode) < 0)
+ ret = nfs_readdir_xdr_to_array(desc, page, inode);
+ if (ret < 0)
goto error;
SetPageUptodate(page);
return 0;
error:
unlock_page(page);
- return -EIO;
+ return ret;
}
static
static
struct page *get_cache_page(nfs_readdir_descriptor_t *desc)
{
- struct page *page;
- page = read_cache_page(desc->file->f_path.dentry->d_inode->i_mapping,
+ return read_cache_page(desc->file->f_path.dentry->d_inode->i_mapping,
desc->page_index, (filler_t *)nfs_readdir_filler, desc);
- if (IS_ERR(page))
- desc->eof = 1;
- return page;
}
/*
static inline
int readdir_search_pagecache(nfs_readdir_descriptor_t *desc)
{
- int res = -EAGAIN;
+ int res;
+ if (desc->page_index == 0)
+ desc->current_index = 0;
while (1) {
res = find_cache_page(desc);
if (res != -EAGAIN)
int res = 0;
struct nfs_cache_array *array = NULL;
unsigned int d_type = DT_UNKNOWN;
- struct dentry *dentry = NULL;
array = nfs_readdir_get_array(desc->page);
+ if (IS_ERR(array)) {
+ res = PTR_ERR(array);
+ goto out;
+ }
for (i = desc->cache_entry_index; i < array->size; i++) {
d_type = DT_UNKNOWN;
*desc->dir_cookie = array->array[i+1].cookie;
else
*desc->dir_cookie = array->last_cookie;
- if (i == array->eof_index) {
- desc->eof = 1;
- break;
- }
}
+ if (i == array->eof_index)
+ desc->eof = 1;
nfs_readdir_release_array(desc->page);
+out:
cache_page_release(desc);
- if (dentry != NULL)
- dput(dentry);
dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n",
(unsigned long long)*desc->dir_cookie, res);
return res;
goto out;
}
+ desc->page_index = 0;
+ desc->page = page;
+
if (nfs_readdir_xdr_to_array(desc, page, inode) == -1) {
status = -EIO;
goto out_release;
}
- desc->page_index = 0;
- desc->page = page;
status = nfs_do_filldir(desc, dirent, filldir);
out:
res = NULL;
goto out;
/* This turned out not to be a regular file */
- case -EISDIR:
case -ENOTDIR:
goto no_open;
case -ELOOP:
if (!(nd->intent.open.flags & O_NOFOLLOW))
goto no_open;
+ /* case -EISDIR: */
/* case -EINVAL: */
default:
res = ERR_CAST(inode);
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