From: trondmy@kernel.org
To: linux-nfs@vger.kernel.org
Subject: [PATCH 08/12] NFS: Simplify struct nfs_cache_array_entry
Date: Mon, 2 Nov 2020 13:06:54 -0500 [thread overview]
Message-ID: <20201102180658.6218-9-trondmy@kernel.org> (raw)
In-Reply-To: <20201102180658.6218-8-trondmy@kernel.org>
From: Trond Myklebust <trond.myklebust@hammerspace.com>
We don't need to store a hash, so replace struct qstr with a simple
const char pointer and length.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
---
fs/nfs/dir.c | 46 +++++++++++++++++++++++++---------------------
1 file changed, 25 insertions(+), 21 deletions(-)
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index a91f9ea87611..c82f1bde4f13 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -133,7 +133,8 @@ nfs_closedir(struct inode *inode, struct file *filp)
struct nfs_cache_array_entry {
u64 cookie;
u64 ino;
- struct qstr string;
+ const char *name;
+ unsigned int name_len;
unsigned char d_type;
};
@@ -192,7 +193,7 @@ void nfs_readdir_clear_array(struct page *page)
array = kmap_atomic(page);
for (i = 0; i < array->size; i++)
- kfree(array->array[i].string.name);
+ kfree(array->array[i].name);
nfs_readdir_array_init(array);
kunmap_atomic(array);
}
@@ -213,20 +214,17 @@ static bool nfs_readdir_array_is_full(struct nfs_cache_array *array)
* when called by nfs_readdir_add_to_array, the strings will be freed in
* nfs_clear_readdir_array()
*/
-static
-int nfs_readdir_make_qstr(struct qstr *string, const char *name, unsigned int len)
+static const char *nfs_readdir_copy_name(const char *name, unsigned int len)
{
- string->len = len;
- string->name = kmemdup_nul(name, len, GFP_KERNEL);
- if (string->name == NULL)
- return -ENOMEM;
+ const char *ret = kmemdup_nul(name, len, GFP_KERNEL);
+
/*
* 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(NULL, name, len);
- return 0;
+ if (ret != NULL)
+ kmemleak_not_leak(ret);
+ return ret;
}
/*
@@ -249,27 +247,34 @@ static int nfs_readdir_array_can_expand(struct nfs_cache_array *array)
static
int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page)
{
- struct nfs_cache_array *array = kmap(page);
+ struct nfs_cache_array *array;
struct nfs_cache_array_entry *cache_entry;
+ const char *name;
int ret;
+ name = nfs_readdir_copy_name(entry->name, entry->len);
+ if (!name)
+ return -ENOMEM;
+
+ array = kmap_atomic(page);
ret = nfs_readdir_array_can_expand(array);
- if (ret)
+ if (ret) {
+ kfree(name);
goto out;
+ }
cache_entry = &array->array[array->size];
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;
+ cache_entry->name_len = entry->len;
+ cache_entry->name = name;
array->last_cookie = entry->cookie;
array->size++;
if (entry->eof != 0)
nfs_readdir_array_set_eof(array);
out:
- kunmap(page);
+ kunmap_atomic(array);
return ret;
}
@@ -409,9 +414,8 @@ int nfs_readdir_search_for_cookie(struct nfs_cache_array *array, nfs_readdir_des
if (printk_ratelimit()) {
pr_notice("NFS: directory %pD2 contains a readdir loop."
"Please contact your server vendor. "
- "The file: %.*s has duplicate cookie %llu\n",
- desc->file, array->array[i].string.len,
- array->array[i].string.name, desc->dir_cookie);
+ "The file: %s has duplicate cookie %llu\n",
+ desc->file, array->array[i].name, desc->dir_cookie);
}
status = -ELOOP;
goto out;
@@ -882,7 +886,7 @@ int nfs_do_filldir(nfs_readdir_descriptor_t *desc)
struct nfs_cache_array_entry *ent;
ent = &array->array[i];
- if (!dir_emit(desc->ctx, ent->string.name, ent->string.len,
+ if (!dir_emit(desc->ctx, ent->name, ent->name_len,
nfs_compat_user_ino64(ent->ino), ent->d_type)) {
desc->eof = true;
break;
--
2.28.0
next prev parent reply other threads:[~2020-11-02 18:17 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-02 18:06 [PATCH 00/12] Readdir enhancements trondmy
2020-11-02 18:06 ` [PATCH 01/12] NFS: Ensure contents of struct nfs_open_dir_context are consistent trondmy
2020-11-02 18:06 ` [PATCH 02/12] NFS: Clean up readdir struct nfs_cache_array trondmy
2020-11-02 18:06 ` [PATCH 03/12] NFS: Clean up nfs_readdir_page_filler() trondmy
2020-11-02 18:06 ` [PATCH 04/12] NFS: Clean up directory array handling trondmy
2020-11-02 18:06 ` [PATCH 05/12] NFS: Don't discard readdir results trondmy
2020-11-02 18:06 ` [PATCH 06/12] NFS: Remove unnecessary kmap in nfs_readdir_xdr_to_array() trondmy
2020-11-02 18:06 ` [PATCH 07/12] NFS: Replace kmap() with kmap_atomic() in nfs_readdir_search_array() trondmy
2020-11-02 18:06 ` trondmy [this message]
2020-11-02 18:06 ` [PATCH 09/12] NFS: Support larger readdir buffers trondmy
2020-11-02 18:06 ` [PATCH 10/12] NFS: More readdir cleanups trondmy
2020-11-02 18:06 ` [PATCH 11/12] NFS: nfs_do_filldir() does not return a value trondmy
2020-11-02 18:06 ` [PATCH 12/12] NFS: Reduce readdir stack usage trondmy
2020-11-03 14:18 ` [PATCH 03/12] NFS: Clean up nfs_readdir_page_filler() Benjamin Coddington
2020-11-03 14:24 ` Benjamin Coddington
2020-11-03 13:35 ` [PATCH 02/12] NFS: Clean up readdir struct nfs_cache_array Benjamin Coddington
2020-11-03 14:09 ` Benjamin Coddington
2020-11-03 14:34 ` Benjamin Coddington
2020-11-02 20:40 ` [PATCH 00/12] Readdir enhancements David Wysochanski
2020-11-02 21:32 ` Trond Myklebust
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