aboutsummaryrefslogtreecommitdiff
path: root/fs/nfs/dir.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/nfs/dir.c')
-rw-r--r--fs/nfs/dir.c220
1 files changed, 123 insertions, 97 deletions
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 07ac3847e56..996dd8989a9 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -34,6 +34,7 @@
#include <linux/mount.h>
#include <linux/sched.h>
#include <linux/vmalloc.h>
+#include <linux/kmemleak.h>
#include "delegation.h"
#include "iostat.h"
@@ -56,7 +57,7 @@ static int nfs_rename(struct inode *, struct dentry *,
struct inode *, struct dentry *);
static int nfs_fsync_dir(struct file *, int);
static loff_t nfs_llseek_dir(struct file *, loff_t, int);
-static int nfs_readdir_clear_array(struct page*, gfp_t);
+static void nfs_readdir_clear_array(struct page*);
const struct file_operations nfs_dir_operations = {
.llseek = nfs_llseek_dir,
@@ -82,8 +83,8 @@ const struct inode_operations nfs_dir_inode_operations = {
.setattr = nfs_setattr,
};
-const struct address_space_operations nfs_dir_addr_space_ops = {
- .releasepage = nfs_readdir_clear_array,
+const struct address_space_operations nfs_dir_aops = {
+ .freepage = nfs_readdir_clear_array,
};
#ifdef CONFIG_NFS_V3
@@ -161,6 +162,7 @@ struct nfs_cache_array_entry {
u64 cookie;
u64 ino;
struct qstr string;
+ unsigned char d_type;
};
struct nfs_cache_array {
@@ -170,14 +172,13 @@ struct nfs_cache_array {
struct nfs_cache_array_entry array[0];
};
-#define MAX_READDIR_ARRAY ((PAGE_SIZE - sizeof(struct nfs_cache_array)) / sizeof(struct nfs_cache_array_entry))
-
typedef __be32 * (*decode_dirent_t)(struct xdr_stream *, struct nfs_entry *, struct nfs_server *, int);
typedef struct {
struct file *file;
struct page *page;
unsigned long page_index;
u64 *dir_cookie;
+ u64 last_cookie;
loff_t current_index;
decode_dirent_t decode;
@@ -194,9 +195,13 @@ typedef struct {
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
@@ -209,14 +214,15 @@ void nfs_readdir_release_array(struct page *page)
* we are freeing strings created by nfs_add_to_readdir_array()
*/
static
-int nfs_readdir_clear_array(struct page *page, gfp_t mask)
+void nfs_readdir_clear_array(struct page *page)
{
- struct nfs_cache_array *array = nfs_readdir_get_array(page);
+ struct nfs_cache_array *array;
int i;
+
+ array = kmap_atomic(page, KM_USER0);
for (i = 0; i < array->size; i++)
kfree(array->array[i].string.name);
- nfs_readdir_release_array(page);
- return 0;
+ kunmap_atomic(array, KM_USER0);
}
/*
@@ -231,6 +237,11 @@ int nfs_readdir_make_qstr(struct qstr *string, const char *name, unsigned int le
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;
}
@@ -244,20 +255,24 @@ int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page)
if (IS_ERR(array))
return PTR_ERR(array);
- ret = -EIO;
- if (array->size >= MAX_READDIR_ARRAY)
- goto out;
cache_entry = &array->array[array->size];
+
+ /* Check that this entry lies within the page bounds */
+ ret = -ENOSPC;
+ if ((char *)&cache_entry[1] - (char *)page_address(page) > PAGE_SIZE)
+ goto out;
+
cache_entry->cookie = entry->prev_cookie;
cache_entry->ino = entry->ino;
+ cache_entry->d_type = entry->d_type;
ret = nfs_readdir_make_qstr(&cache_entry->string, entry->name, entry->len);
if (ret)
goto out;
array->last_cookie = entry->cookie;
- if (entry->eof == 1)
- array->eof_index = array->size;
array->size++;
+ if (entry->eof != 0)
+ array->eof_index = array->size;
out:
nfs_readdir_release_array(page);
return ret;
@@ -272,7 +287,7 @@ int nfs_readdir_search_for_pos(struct nfs_cache_array *array, nfs_readdir_descri
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;
@@ -281,8 +296,6 @@ int nfs_readdir_search_for_pos(struct nfs_cache_array *array, nfs_readdir_descri
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;
@@ -296,17 +309,16 @@ int nfs_readdir_search_for_cookie(struct nfs_cache_array *array, nfs_readdir_des
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;
+ return 0;
}
}
-
+ if (array->eof_index >= 0) {
+ status = -EBADCOOKIE;
+ if (*desc->dir_cookie == array->last_cookie)
+ desc->eof = 1;
+ }
return status;
}
@@ -314,10 +326,7 @@ static
int nfs_readdir_search_array(nfs_readdir_descriptor_t *desc)
{
struct nfs_cache_array *array;
- int status = -EBADCOOKIE;
-
- if (desc->dir_cookie == NULL)
- goto out;
+ int status;
array = nfs_readdir_get_array(desc->page);
if (IS_ERR(array)) {
@@ -330,6 +339,10 @@ int nfs_readdir_search_array(nfs_readdir_descriptor_t *desc)
else
status = nfs_readdir_search_for_cookie(array, desc);
+ if (status == -EAGAIN) {
+ desc->last_cookie = array->last_cookie;
+ desc->page_index++;
+ }
nfs_readdir_release_array(desc->page);
out:
return status;
@@ -381,13 +394,9 @@ int xdr_decode(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry, struct x
static
int nfs_same_file(struct dentry *dentry, struct nfs_entry *entry)
{
- struct nfs_inode *node;
if (dentry->d_inode == NULL)
goto different;
- node = NFS_I(dentry->d_inode);
- if (node->fh.size != entry->fh->size)
- goto different;
- if (strncmp(node->fh.data, entry->fh->data, node->fh.size) != 0)
+ if (nfs_compare_fh(entry->fh, NFS_FH(dentry->d_inode)) != 0)
goto different;
return 1;
different:
@@ -449,14 +458,15 @@ out:
/* 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;
@@ -471,21 +481,32 @@ void nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *e
do {
status = xdr_decode(desc, entry, &stream);
- if (status != 0)
+ if (status != 0) {
+ if (status == -EAGAIN)
+ status = 0;
break;
+ }
- if (nfs_readdir_add_to_array(entry, page) == -1)
- break;
- if (desc->plus == 1)
+ count++;
+
+ if (desc->plus != 0)
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 != 0)) {
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
@@ -537,11 +558,11 @@ int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page,
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;
- entry.cookie = *desc->dir_cookie;
+ entry.cookie = desc->last_cookie;
entry.eof = 0;
entry.fh = nfs_alloc_fhandle();
entry.fattr = nfs_alloc_fattr();
@@ -549,6 +570,10 @@ int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page,
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;
@@ -556,12 +581,19 @@ int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page,
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:
@@ -582,8 +614,10 @@ static
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);
@@ -595,12 +629,14 @@ int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page* page)
return 0;
error:
unlock_page(page);
- return -EIO;
+ return ret;
}
static
void cache_page_release(nfs_readdir_descriptor_t *desc)
{
+ if (!desc->page->mapping)
+ nfs_readdir_clear_array(desc->page);
page_cache_release(desc->page);
desc->page = NULL;
}
@@ -608,12 +644,8 @@ void cache_page_release(nfs_readdir_descriptor_t *desc)
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;
}
/*
@@ -629,9 +661,8 @@ int find_cache_page(nfs_readdir_descriptor_t *desc)
return PTR_ERR(desc->page);
res = nfs_readdir_search_array(desc);
- if (res == 0)
- return 0;
- cache_page_release(desc);
+ if (res != 0)
+ cache_page_release(desc);
return res;
}
@@ -639,22 +670,18 @@ int find_cache_page(nfs_readdir_descriptor_t *desc)
static inline
int readdir_search_pagecache(nfs_readdir_descriptor_t *desc)
{
- int res = -EAGAIN;
+ int res;
- while (1) {
- res = find_cache_page(desc);
- if (res != -EAGAIN)
- break;
- desc->page_index++;
+ if (desc->page_index == 0) {
+ desc->current_index = 0;
+ desc->last_cookie = 0;
}
+ do {
+ res = find_cache_page(desc);
+ } while (res == -EAGAIN);
return res;
}
-static inline unsigned int dt_type(struct inode *inode)
-{
- return (inode->i_mode >> 12) & 15;
-}
-
/*
* Once we've found the start of the dirent within a page: fill 'er up...
*/
@@ -666,35 +693,35 @@ int nfs_do_filldir(nfs_readdir_descriptor_t *desc, void *dirent,
int i = 0;
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;
+ struct nfs_cache_array_entry *ent;
- res = filldir(dirent, array->array[i].string.name,
- array->array[i].string.len, file->f_pos,
- nfs_compat_user_ino64(array->array[i].ino), d_type);
- if (res < 0)
+ ent = &array->array[i];
+ if (filldir(dirent, ent->string.name, ent->string.len,
+ file->f_pos, nfs_compat_user_ino64(ent->ino),
+ ent->d_type) < 0) {
+ desc->eof = 1;
break;
+ }
file->f_pos++;
- desc->cache_entry_index = i;
if (i < (array->size-1))
*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 (array->eof_index >= 0)
+ 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;
@@ -729,13 +756,14 @@ int uncached_readdir(nfs_readdir_descriptor_t *desc, void *dirent,
goto out;
}
- if (nfs_readdir_xdr_to_array(desc, page, inode) == -1) {
- status = -EIO;
- goto out_release;
- }
-
desc->page_index = 0;
+ desc->last_cookie = *desc->dir_cookie;
desc->page = page;
+
+ status = nfs_readdir_xdr_to_array(desc, page, inode);
+ if (status < 0)
+ goto out_release;
+
status = nfs_do_filldir(desc, dirent, filldir);
out:
@@ -757,7 +785,7 @@ static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
struct inode *inode = dentry->d_inode;
nfs_readdir_descriptor_t my_desc,
*desc = &my_desc;
- int res = -ENOMEM;
+ int res;
dfprintk(FILE, "NFS: readdir(%s/%s) starting at cookie %llu\n",
dentry->d_parent->d_name.name, dentry->d_name.name,
@@ -782,18 +810,18 @@ static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
if (res < 0)
goto out;
- while (desc->eof != 1) {
+ do {
res = readdir_search_pagecache(desc);
if (res == -EBADCOOKIE) {
+ res = 0;
/* This means either end of directory */
if (*desc->dir_cookie && desc->eof == 0) {
/* Or that the server has 'lost' a cookie */
res = uncached_readdir(desc, dirent, filldir);
- if (res >= 0)
+ if (res == 0)
continue;
}
- res = 0;
break;
}
if (res == -ETOOSMALL && desc->plus) {
@@ -808,11 +836,9 @@ static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
break;
res = nfs_do_filldir(desc, dirent, filldir);
- if (res < 0) {
- res = 0;
+ if (res < 0)
break;
- }
- }
+ } while (!desc->eof);
out:
nfs_unblock_sillyrename(dentry);
if (res > 0)
@@ -1345,12 +1371,12 @@ static struct dentry *nfs_atomic_lookup(struct inode *dir, struct dentry *dentry
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);