[PATCH] NFS: Clean up readdir changes.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index fceef29..b38a57e 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -51,8 +51,10 @@
static int nfs_rename(struct inode *, struct dentry *,
struct inode *, struct dentry *);
static int nfs_fsync_dir(struct file *, struct dentry *, int);
+static loff_t nfs_llseek_dir(struct file *, loff_t, int);
struct file_operations nfs_dir_operations = {
+ .llseek = nfs_llseek_dir,
.read = generic_read_dir,
.readdir = nfs_readdir,
.open = nfs_opendir,
@@ -141,9 +143,8 @@
struct page *page;
unsigned long page_index;
u32 *ptr;
- u64 target_cookie;
- int target_index;
- int current_index;
+ u64 *dir_cookie;
+ loff_t current_index;
struct nfs_entry *entry;
decode_dirent_t decode;
int plus;
@@ -227,7 +228,7 @@
/*
* Given a pointer to a buffer that has already been filled by a call
- * to readdir, find the next entry with cookie 'desc->target_cookie'.
+ * to readdir, find the next entry with cookie '*desc->dir_cookie'.
*
* If the end of the buffer has been reached, return -EAGAIN, if not,
* return the offset within the buffer of the next entry to be
@@ -241,8 +242,8 @@
status;
while((status = dir_decode(desc)) == 0) {
- dfprintk(VFS, "NFS: found cookie %Lu\n", (long long)entry->cookie);
- if (entry->prev_cookie == desc->target_cookie)
+ dfprintk(VFS, "NFS: found cookie %Lu\n", (unsigned long long)entry->cookie);
+ if (entry->prev_cookie == *desc->dir_cookie)
break;
if (loop_count++ > 200) {
loop_count = 0;
@@ -255,7 +256,7 @@
/*
* Given a pointer to a buffer that has already been filled by a call
- * to readdir, find the entry at offset 'desc->target_index'.
+ * to readdir, find the entry at offset 'desc->file->f_pos'.
*
* If the end of the buffer has been reached, return -EAGAIN, if not,
* return the offset within the buffer of the next entry to be
@@ -273,10 +274,10 @@
if (status)
break;
- dfprintk(VFS, "NFS: found cookie %Lu at index %d\n", (long long)entry->cookie, desc->current_index);
+ dfprintk(VFS, "NFS: found cookie %Lu at index %Ld\n", (unsigned long long)entry->cookie, desc->current_index);
- if (desc->target_index == desc->current_index) {
- desc->target_cookie = entry->cookie;
+ if (desc->file->f_pos == desc->current_index) {
+ *desc->dir_cookie = entry->cookie;
break;
}
desc->current_index++;
@@ -314,7 +315,7 @@
/* NOTE: Someone else may have changed the READDIRPLUS flag */
desc->page = page;
desc->ptr = kmap(page); /* matching kunmap in nfs_do_filldir */
- if (desc->target_cookie)
+ if (*desc->dir_cookie != 0)
status = find_dirent(desc);
else
status = find_dirent_index(desc);
@@ -332,8 +333,8 @@
* Recurse through the page cache pages, and return a
* filled nfs_entry structure of the next directory entry if possible.
*
- * The target for the search is 'desc->target_cookie' if non-0,
- * 'desc->target_index' otherwise
+ * The target for the search is '*desc->dir_cookie' if non-0,
+ * 'desc->file->f_pos' otherwise
*/
static inline
int readdir_search_pagecache(nfs_readdir_descriptor_t *desc)
@@ -341,18 +342,15 @@
int loop_count = 0;
int res;
- if (desc->target_cookie)
- dfprintk(VFS, "NFS: readdir_search_pagecache() searching for cookie %Lu\n", (long long)desc->target_cookie);
- else
- dfprintk(VFS, "NFS: readdir_search_pagecache() searching for cookie number %d\n", desc->target_index);
-
/* Always search-by-index from the beginning of the cache */
- if (!(desc->target_cookie)) {
+ if (*desc->dir_cookie == 0) {
+ dfprintk(VFS, "NFS: readdir_search_pagecache() searching for offset %Ld\n", (long long)desc->file->f_pos);
desc->page_index = 0;
desc->entry->cookie = desc->entry->prev_cookie = 0;
desc->entry->eof = 0;
desc->current_index = 0;
- }
+ } else
+ dfprintk(VFS, "NFS: readdir_search_pagecache() searching for cookie %Lu\n", (unsigned long long)*desc->dir_cookie);
for (;;) {
res = find_dirent_page(desc);
@@ -386,7 +384,6 @@
struct file *file = desc->file;
struct nfs_entry *entry = desc->entry;
struct dentry *dentry = NULL;
- struct nfs_open_context *ctx = file->private_data;
unsigned long fileid;
int loop_count = 0,
res;
@@ -415,7 +412,7 @@
if (res < 0)
break;
file->f_pos++;
- desc->target_cookie = entry->cookie;
+ *desc->dir_cookie = entry->cookie;
if (dir_decode(desc) != 0) {
desc->page_index ++;
break;
@@ -425,12 +422,10 @@
schedule();
}
}
- ctx->dir_pos = file->f_pos;
- ctx->dir_cookie = desc->target_cookie;
dir_page_release(desc);
if (dentry != NULL)
dput(dentry);
- dfprintk(VFS, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n", (long long)desc->target_cookie, res);
+ dfprintk(VFS, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n", (unsigned long long)*desc->dir_cookie, res);
return res;
}
@@ -456,14 +451,14 @@
struct page *page = NULL;
int status;
- dfprintk(VFS, "NFS: uncached_readdir() searching for cookie %Lu\n", (long long)desc->target_cookie);
+ dfprintk(VFS, "NFS: uncached_readdir() searching for cookie %Lu\n", (unsigned long long)*desc->dir_cookie);
page = alloc_page(GFP_HIGHUSER);
if (!page) {
status = -ENOMEM;
goto out;
}
- desc->error = NFS_PROTO(inode)->readdir(file->f_dentry, cred, desc->target_cookie,
+ desc->error = NFS_PROTO(inode)->readdir(file->f_dentry, cred, *desc->dir_cookie,
page,
NFS_SERVER(inode)->dtsize,
desc->plus);
@@ -472,7 +467,7 @@
desc->ptr = kmap(page); /* matching kunmap in nfs_do_filldir */
if (desc->error >= 0) {
if ((status = dir_decode(desc)) == 0)
- desc->entry->prev_cookie = desc->target_cookie;
+ desc->entry->prev_cookie = *desc->dir_cookie;
} else
status = -EIO;
if (status < 0)
@@ -501,7 +496,6 @@
{
struct dentry *dentry = filp->f_dentry;
struct inode *inode = dentry->d_inode;
- struct nfs_open_context *ctx = filp->private_data;
nfs_readdir_descriptor_t my_desc,
*desc = &my_desc;
struct nfs_entry my_entry;
@@ -519,21 +513,16 @@
/*
* filp->f_pos points to the dirent entry number.
- * ctx->dir_pos has the number of the cached cookie. We have
+ * *desc->dir_cookie has the cookie for the next entry. We have
* to either find the entry with the appropriate number or
* revalidate the cookie.
*/
memset(desc, 0, sizeof(*desc));
desc->file = filp;
+ desc->dir_cookie = &((struct nfs_open_context *)filp->private_data)->dir_cookie;
desc->decode = NFS_PROTO(inode)->decode_dirent;
desc->plus = NFS_USE_READDIRPLUS(inode);
- desc->target_index = filp->f_pos;
-
- if (filp->f_pos == ctx->dir_pos)
- desc->target_cookie = ctx->dir_cookie;
- else
- desc->target_cookie = 0;
my_entry.cookie = my_entry.prev_cookie = 0;
my_entry.eof = 0;
@@ -546,7 +535,7 @@
if (res == -EBADCOOKIE) {
/* This means either end of directory */
- if (desc->target_cookie && desc->entry->cookie != desc->target_cookie) {
+ if (*desc->dir_cookie && desc->entry->cookie != *desc->dir_cookie) {
/* Or that the server has 'lost' a cookie */
res = uncached_readdir(desc, dirent, filldir);
if (res >= 0)
@@ -579,6 +568,28 @@
return 0;
}
+loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int origin)
+{
+ down(&filp->f_dentry->d_inode->i_sem);
+ switch (origin) {
+ case 1:
+ offset += filp->f_pos;
+ case 0:
+ if (offset >= 0)
+ break;
+ default:
+ offset = -EINVAL;
+ goto out;
+ }
+ if (offset != filp->f_pos) {
+ filp->f_pos = offset;
+ ((struct nfs_open_context *)filp->private_data)->dir_cookie = 0;
+ }
+out:
+ up(&filp->f_dentry->d_inode->i_sem);
+ return offset;
+}
+
/*
* All directory operations under NFS are synchronous, so fsync()
* is a dummy operation.