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NFS: Ensure we check all allocation return values in new readdir code 

Also some clean ups.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2010-10-23 14:53:23 -04:00
parent 82f2e5472e
commit 4a201d6e3f
1 changed files with 37 additions and 24 deletions
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61
fs/nfs/dir.c
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@ -225,33 +225,42 @@ int nfs_readdir_clear_array(struct page *page, gfp_t mask)
* nfs_clear_readdir_array()
*/
static
void nfs_readdir_make_qstr(struct qstr *string, const char *name, unsigned int len)
int nfs_readdir_make_qstr(struct qstr *string, const char *name, unsigned int len)
{
string->len = len;
string->name = kmemdup(name, len, GFP_KERNEL);
string->hash = full_name_hash(string->name, string->len);
if (string->name == NULL)
return -ENOMEM;
string->hash = full_name_hash(name, len);
return 0;
}
static
int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page)
{
struct nfs_cache_array *array = nfs_readdir_get_array(page);
struct nfs_cache_array_entry *cache_entry;
int ret;
if (IS_ERR(array))
return PTR_ERR(array);
if (array->size >= MAX_READDIR_ARRAY) {
nfs_readdir_release_array(page);
return -EIO;
}
ret = -EIO;
if (array->size >= MAX_READDIR_ARRAY)
goto out;
array->array[array->size].cookie = entry->prev_cookie;
cache_entry = &array->array[array->size];
cache_entry->cookie = entry->prev_cookie;
cache_entry->ino = entry->ino;
ret = nfs_readdir_make_qstr(&cache_entry->string, entry->name, entry->len);
if (ret)
goto out;
array->last_cookie = entry->cookie;
array->array[array->size].ino = entry->ino;
nfs_readdir_make_qstr(&array->array[array->size].string, entry->name, entry->len);
if (entry->eof == 1)
array->eof_index = array->size;
array->size++;
out:
nfs_readdir_release_array(page);
return 0;
return ret;
}
static
@ -388,21 +397,24 @@ int nfs_same_file(struct dentry *dentry, struct nfs_entry *entry)
static
void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry)
{
struct qstr filename;
struct dentry *dentry = NULL;
struct dentry *alias = NULL;
struct qstr filename = {
.len = entry->len,
.name = entry->name,
};
struct dentry *dentry;
struct dentry *alias;
struct inode *dir = parent->d_inode;
struct inode *inode;
nfs_readdir_make_qstr(&filename, entry->name, entry->len);
if (filename.len == 1 && filename.name[0] == '.')
dentry = dget(parent);
else if (filename.len == 2 && filename.name[0] == '.'
&& filename.name[1] == '.')
dentry = dget_parent(parent);
else
dentry = d_lookup(parent, &filename);
if (filename.name[0] == '.') {
if (filename.len == 1)
return;
if (filename.len == 2 && filename.name[1] == '.')
return;
}
filename.hash = full_name_hash(filename.name, filename.len);
dentry = d_lookup(parent, &filename);
if (dentry != NULL) {
if (nfs_same_file(dentry, entry)) {
nfs_refresh_inode(dentry->d_inode, entry->fattr);
@ -414,6 +426,9 @@ void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry)
}
dentry = d_alloc(parent, &filename);
if (dentry == NULL)
return;
dentry->d_op = NFS_PROTO(dir)->dentry_ops;
inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr);
if (IS_ERR(inode))
@ -430,8 +445,6 @@ void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry)
out:
dput(dentry);
kfree(filename.name);
return;
}
/* Perform conversion from xdr to cache array */
@ -508,7 +521,7 @@ void *nfs_readdir_large_page(struct page **pages, unsigned int npages)
pages[i] = page;
}
ptr = vm_map_ram(pages, NFS_MAX_READDIR_PAGES, 0, PAGE_KERNEL);
ptr = vm_map_ram(pages, npages, 0, PAGE_KERNEL);
if (!IS_ERR_OR_NULL(ptr))
return ptr;
out_freepages: