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Date: Tue, 7 Dec 2010 17:16:48 -0500
From: Trond Myklebust <Trond.Myklebust@...app.com>
To: linux-nfs@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] NFS: Readdir cleanups
No functional changes, but clarify the code.
Signed-off-by: Trond Myklebust <Trond.Myklebust@...app.com>
---
fs/nfs/dir.c | 47 +++++++++++++++++------------------------------
1 files changed, 17 insertions(+), 30 deletions(-)
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index ad2fde2..996dd89 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -271,7 +271,7 @@ int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page)
goto out;
array->last_cookie = entry->cookie;
array->size++;
- if (entry->eof == 1)
+ if (entry->eof != 0)
array->eof_index = array->size;
out:
nfs_readdir_release_array(page);
@@ -311,16 +311,14 @@ int nfs_readdir_search_for_cookie(struct nfs_cache_array *array, nfs_readdir_des
for (i = 0; i < array->size; i++) {
if (array->array[i].cookie == *desc->dir_cookie) {
desc->cache_entry_index = i;
- status = 0;
- goto out;
+ return 0;
}
}
- if (i == array->eof_index) {
+ if (array->eof_index >= 0) {
status = -EBADCOOKIE;
if (*desc->dir_cookie == array->last_cookie)
desc->eof = 1;
}
-out:
return status;
}
@@ -328,10 +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)) {
@@ -344,8 +339,10 @@ int nfs_readdir_search_array(nfs_readdir_descriptor_t *desc)
else
status = nfs_readdir_search_for_cookie(array, desc);
- if (status == -EAGAIN)
+ if (status == -EAGAIN) {
desc->last_cookie = array->last_cookie;
+ desc->page_index++;
+ }
nfs_readdir_release_array(desc->page);
out:
return status;
@@ -492,7 +489,7 @@ int nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *en
count++;
- if (desc->plus == 1)
+ if (desc->plus != 0)
nfs_prime_dcache(desc->file->f_path.dentry, entry);
status = nfs_readdir_add_to_array(entry, page);
@@ -500,7 +497,7 @@ int nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *en
break;
} while (!entry->eof);
- if (count == 0 || (status == -EBADCOOKIE && entry->eof == 1)) {
+ if (count == 0 || (status == -EBADCOOKIE && entry->eof != 0)) {
array = nfs_readdir_get_array(page);
if (!IS_ERR(array)) {
array->eof_index = array->size;
@@ -664,9 +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;
}
@@ -680,20 +676,12 @@ int readdir_search_pagecache(nfs_readdir_descriptor_t *desc)
desc->current_index = 0;
desc->last_cookie = 0;
}
- while (1) {
+ do {
res = find_cache_page(desc);
- if (res != -EAGAIN)
- break;
- desc->page_index++;
- }
+ } 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...
*/
@@ -723,13 +711,12 @@ int nfs_do_filldir(nfs_readdir_descriptor_t *desc, void *dirent,
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)
+ if (array->eof_index >= 0)
desc->eof = 1;
nfs_readdir_release_array(desc->page);
@@ -798,7 +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,
@@ -823,7 +810,7 @@ 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) {
@@ -851,7 +838,7 @@ static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
res = nfs_do_filldir(desc, dirent, filldir);
if (res < 0)
break;
- }
+ } while (!desc->eof);
out:
nfs_unblock_sillyrename(dentry);
if (res > 0)
--
1.7.3.2
--
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