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https://github.com/torvalds/linux
synced 2024-09-21 03:28:37 +00:00
NFS: add readdir cache array
This patch adds the readdir cache array and functions to retreive the array stored on a cache page, clear the array by freeing allocated memory, add an entry to the array, and search the array for a given cookie. It then modifies readdir to make use of the new cache array. With the new cache array method, we no longer need some of this code. Finally, nfs_llseek_dir() will set file->f_pos to a value greater than 0 and desc->dir_cookie to zero. When we see this, readdir needs to find the file at position file->f_pos from the start of the directory. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Bryan Schumaker
Trond Myklebust
parent
8c7597f6ce
commit
d1bacf9eb2
640
fs/nfs/dir.c
640
fs/nfs/dir.c
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@ -55,6 +55,7 @@ static int nfs_rename(struct inode *, struct dentry *,
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struct inode *, struct dentry *);
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static int nfs_fsync_dir(struct file *, int);
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static loff_t nfs_llseek_dir(struct file *, loff_t, int);
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static int nfs_readdir_clear_array(struct page*, gfp_t);
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const struct file_operations nfs_dir_operations = {
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.llseek = nfs_llseek_dir,
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@ -80,6 +81,10 @@ const struct inode_operations nfs_dir_inode_operations = {
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.setattr = nfs_setattr,
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};
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const struct address_space_operations nfs_dir_addr_space_ops = {
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.releasepage = nfs_readdir_clear_array,
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};
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#ifdef CONFIG_NFS_V3
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const struct inode_operations nfs3_dir_inode_operations = {
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.create = nfs_create,
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@ -151,51 +156,188 @@ nfs_opendir(struct inode *inode, struct file *filp)
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return res;
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}
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struct nfs_cache_array_entry {
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u64 cookie;
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u64 ino;
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struct qstr string;
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};
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struct nfs_cache_array {
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unsigned int size;
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int eof_index;
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u64 last_cookie;
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struct nfs_cache_array_entry array[0];
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};
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#define MAX_READDIR_ARRAY ((PAGE_SIZE - sizeof(struct nfs_cache_array)) / sizeof(struct nfs_cache_array_entry))
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typedef __be32 * (*decode_dirent_t)(__be32 *, struct nfs_entry *, int);
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typedef struct {
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struct file *file;
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struct page *page;
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unsigned long page_index;
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__be32 *ptr;
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u64 *dir_cookie;
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loff_t current_index;
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struct nfs_entry *entry;
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decode_dirent_t decode;
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int plus;
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unsigned long timestamp;
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unsigned long gencount;
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int timestamp_valid;
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unsigned int cache_entry_index;
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unsigned int plus:1;
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unsigned int eof:1;
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} nfs_readdir_descriptor_t;
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/* Now we cache directories properly, by stuffing the dirent
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* data directly in the page cache.
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*
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* Inode invalidation due to refresh etc. takes care of
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* _everything_, no sloppy entry flushing logic, no extraneous
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* copying, network direct to page cache, the way it was meant
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* to be.
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*
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* NOTE: Dirent information verification is done always by the
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* page-in of the RPC reply, nowhere else, this simplies
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* things substantially.
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/*
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* The caller is responsible for calling nfs_readdir_release_array(page)
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*/
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static
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int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page *page)
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struct nfs_cache_array *nfs_readdir_get_array(struct page *page)
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{
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if (page == NULL)
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return ERR_PTR(-EIO);
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return (struct nfs_cache_array *)kmap(page);
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}
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static
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void nfs_readdir_release_array(struct page *page)
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{
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kunmap(page);
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}
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/*
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* we are freeing strings created by nfs_add_to_readdir_array()
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*/
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static
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int nfs_readdir_clear_array(struct page *page, gfp_t mask)
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{
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struct nfs_cache_array *array = nfs_readdir_get_array(page);
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int i;
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for (i = 0; i < array->size; i++)
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kfree(array->array[i].string.name);
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nfs_readdir_release_array(page);
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return 0;
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}
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/*
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* the caller is responsible for freeing qstr.name
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* when called by nfs_readdir_add_to_array, the strings will be freed in
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* nfs_clear_readdir_array()
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*/
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static
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void nfs_readdir_make_qstr(struct qstr *string, const char *name, unsigned int len)
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{
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string->len = len;
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string->name = kmemdup(name, len, GFP_KERNEL);
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string->hash = full_name_hash(string->name, string->len);
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}
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static
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int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page)
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{
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struct nfs_cache_array *array = nfs_readdir_get_array(page);
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if (IS_ERR(array))
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return PTR_ERR(array);
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if (array->size >= MAX_READDIR_ARRAY) {
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nfs_readdir_release_array(page);
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return -EIO;
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}
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array->array[array->size].cookie = entry->prev_cookie;
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array->last_cookie = entry->cookie;
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array->array[array->size].ino = entry->ino;
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nfs_readdir_make_qstr(&array->array[array->size].string, entry->name, entry->len);
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if (entry->eof == 1)
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array->eof_index = array->size;
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array->size++;
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nfs_readdir_release_array(page);
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return 0;
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}
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static
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int nfs_readdir_search_for_pos(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc)
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{
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loff_t diff = desc->file->f_pos - desc->current_index;
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unsigned int index;
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if (diff < 0)
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goto out_eof;
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if (diff >= array->size) {
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if (array->eof_index > 0)
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goto out_eof;
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desc->current_index += array->size;
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return -EAGAIN;
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}
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index = (unsigned int)diff;
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*desc->dir_cookie = array->array[index].cookie;
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desc->cache_entry_index = index;
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if (index == array->eof_index)
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desc->eof = 1;
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return 0;
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out_eof:
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desc->eof = 1;
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return -EBADCOOKIE;
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}
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static
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int nfs_readdir_search_for_cookie(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc)
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{
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int i;
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int status = -EAGAIN;
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for (i = 0; i < array->size; i++) {
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if (i == array->eof_index) {
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desc->eof = 1;
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status = -EBADCOOKIE;
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}
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if (array->array[i].cookie == *desc->dir_cookie) {
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desc->cache_entry_index = i;
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status = 0;
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break;
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}
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}
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return status;
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}
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static
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int nfs_readdir_search_array(nfs_readdir_descriptor_t *desc)
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{
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struct nfs_cache_array *array;
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int status = -EBADCOOKIE;
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if (desc->dir_cookie == NULL)
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goto out;
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array = nfs_readdir_get_array(desc->page);
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if (IS_ERR(array)) {
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status = PTR_ERR(array);
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goto out;
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}
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if (*desc->dir_cookie == 0)
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status = nfs_readdir_search_for_pos(array, desc);
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else
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status = nfs_readdir_search_for_cookie(array, desc);
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nfs_readdir_release_array(desc->page);
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out:
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return status;
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}
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/* Fill a page with xdr information before transferring to the cache page */
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static
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int nfs_readdir_xdr_filler(struct page *xdr_page, nfs_readdir_descriptor_t *desc,
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struct nfs_entry *entry, struct file *file, struct inode *inode)
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{
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struct file *file = desc->file;
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struct inode *inode = file->f_path.dentry->d_inode;
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struct rpc_cred *cred = nfs_file_cred(file);
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unsigned long timestamp, gencount;
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int error;
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dfprintk(DIRCACHE, "NFS: %s: reading cookie %Lu into page %lu\n",
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__func__, (long long)desc->entry->cookie,
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page->index);
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again:
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timestamp = jiffies;
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gencount = nfs_inc_attr_generation_counter();
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error = NFS_PROTO(inode)->readdir(file->f_path.dentry, cred, desc->entry->cookie, page,
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error = NFS_PROTO(inode)->readdir(file->f_path.dentry, cred, entry->cookie, xdr_page,
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NFS_SERVER(inode)->dtsize, desc->plus);
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if (error < 0) {
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/* We requested READDIRPLUS, but the server doesn't grok it */
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@ -209,12 +351,93 @@ int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page *page)
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}
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desc->timestamp = timestamp;
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desc->gencount = gencount;
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desc->timestamp_valid = 1;
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error:
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return error;
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}
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/* Fill in an entry based on the xdr code stored in desc->page */
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static
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int xdr_decode(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry, __be32 **ptr)
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{
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__be32 *p = *ptr;
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p = desc->decode(p, entry, desc->plus);
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if (IS_ERR(p))
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return PTR_ERR(p);
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*ptr = p;
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entry->fattr->time_start = desc->timestamp;
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entry->fattr->gencount = desc->gencount;
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return 0;
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}
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/* Perform conversion from xdr to cache array */
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static
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void nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry,
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struct page *xdr_page, struct page *page)
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{
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__be32 *ptr = kmap(xdr_page);
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while (xdr_decode(desc, entry, &ptr) == 0) {
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if (nfs_readdir_add_to_array(entry, page) == -1)
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break;
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}
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kunmap(xdr_page);
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}
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static
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int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page, struct inode *inode)
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{
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struct page *xdr_page;
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struct nfs_entry entry;
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struct file *file = desc->file;
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struct nfs_cache_array *array;
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int status = 0;
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entry.prev_cookie = 0;
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entry.cookie = *desc->dir_cookie;
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entry.eof = 0;
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entry.fh = nfs_alloc_fhandle();
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entry.fattr = nfs_alloc_fattr();
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if (entry.fh == NULL || entry.fattr == NULL)
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goto out;
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array = nfs_readdir_get_array(page);
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memset(array, 0, sizeof(struct nfs_cache_array));
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array->eof_index = -1;
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xdr_page = alloc_page(GFP_KERNEL);
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if (!xdr_page)
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goto out_release_array;
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do {
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status = nfs_readdir_xdr_filler(xdr_page, desc, &entry, file, inode);
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if (status < 0)
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break;
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nfs_readdir_page_filler(desc, &entry, xdr_page, page);
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} while (array->eof_index < 0 && array->size < MAX_READDIR_ARRAY);
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put_page(xdr_page);
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out_release_array:
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nfs_readdir_release_array(page);
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out:
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nfs_free_fattr(entry.fattr);
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nfs_free_fhandle(entry.fh);
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return status;
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}
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/*
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* Now we cache directories properly, by converting xdr information
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* to an array that can be used for lookups later. This results in
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* fewer cache pages, since we can store more information on each page.
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* We only need to convert from xdr once so future lookups are much simpler
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*/
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static
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int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page* page)
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{
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struct inode *inode = desc->file->f_path.dentry->d_inode;
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if (nfs_readdir_xdr_to_array(desc, page, inode) == -1)
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goto error;
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SetPageUptodate(page);
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/* Ensure consistent page alignment of the data.
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* Note: assumes we have exclusive access to this mapping either
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* through inode->i_mutex or some other mechanism.
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*/
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if (invalidate_inode_pages2_range(inode->i_mapping, page->index + 1, -1) < 0) {
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/* Should never happen */
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nfs_zap_mapping(inode, inode->i_mapping);
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@ -226,173 +449,59 @@ int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page *page)
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return -EIO;
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}
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static inline
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int dir_decode(nfs_readdir_descriptor_t *desc)
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static
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void cache_page_release(nfs_readdir_descriptor_t *desc)
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{
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__be32 *p = desc->ptr;
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p = desc->decode(p, desc->entry, desc->plus);
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if (IS_ERR(p))
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return PTR_ERR(p);
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desc->ptr = p;
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if (desc->timestamp_valid) {
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desc->entry->fattr->time_start = desc->timestamp;
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desc->entry->fattr->gencount = desc->gencount;
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} else
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desc->entry->fattr->valid &= ~NFS_ATTR_FATTR;
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return 0;
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}
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static inline
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void dir_page_release(nfs_readdir_descriptor_t *desc)
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{
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kunmap(desc->page);
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page_cache_release(desc->page);
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desc->page = NULL;
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desc->ptr = NULL;
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}
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/*
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* Given a pointer to a buffer that has already been filled by a call
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* to readdir, find the next entry with cookie '*desc->dir_cookie'.
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*
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* If the end of the buffer has been reached, return -EAGAIN, if not,
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* return the offset within the buffer of the next entry to be
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* read.
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*/
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static inline
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int find_dirent(nfs_readdir_descriptor_t *desc)
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static
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struct page *get_cache_page(nfs_readdir_descriptor_t *desc)
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{
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struct nfs_entry *entry = desc->entry;
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int loop_count = 0,
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status;
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while((status = dir_decode(desc)) == 0) {
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dfprintk(DIRCACHE, "NFS: %s: examining cookie %Lu\n",
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__func__, (unsigned long long)entry->cookie);
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if (entry->prev_cookie == *desc->dir_cookie)
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break;
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if (loop_count++ > 200) {
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loop_count = 0;
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schedule();
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}
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}
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return status;
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struct page *page;
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page = read_cache_page(desc->file->f_path.dentry->d_inode->i_mapping,
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desc->page_index, (filler_t *)nfs_readdir_filler, desc);
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if (IS_ERR(page))
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desc->eof = 1;
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return page;
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}
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|
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/*
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* Given a pointer to a buffer that has already been filled by a call
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* to readdir, find the entry at offset 'desc->file->f_pos'.
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*
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* If the end of the buffer has been reached, return -EAGAIN, if not,
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* return the offset within the buffer of the next entry to be
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* read.
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* Returns 0 if desc->dir_cookie was found on page desc->page_index
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*/
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static inline
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int find_dirent_index(nfs_readdir_descriptor_t *desc)
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static
|
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int find_cache_page(nfs_readdir_descriptor_t *desc)
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{
|
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struct nfs_entry *entry = desc->entry;
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int loop_count = 0,
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status;
|
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int res;
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|
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for(;;) {
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status = dir_decode(desc);
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if (status)
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break;
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desc->page = get_cache_page(desc);
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if (IS_ERR(desc->page))
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return PTR_ERR(desc->page);
|
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|
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dfprintk(DIRCACHE, "NFS: found cookie %Lu at index %Ld\n",
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(unsigned long long)entry->cookie, desc->current_index);
|
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|
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if (desc->file->f_pos == desc->current_index) {
|
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*desc->dir_cookie = entry->cookie;
|
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break;
|
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}
|
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desc->current_index++;
|
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if (loop_count++ > 200) {
|
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loop_count = 0;
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schedule();
|
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}
|
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}
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return status;
|
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res = nfs_readdir_search_array(desc);
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if (res == 0)
|
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return 0;
|
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cache_page_release(desc);
|
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return res;
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}
|
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|
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/*
|
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* Find the given page, and call find_dirent() or find_dirent_index in
|
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* order to try to return the next entry.
|
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*/
|
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static inline
|
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int find_dirent_page(nfs_readdir_descriptor_t *desc)
|
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{
|
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struct inode *inode = desc->file->f_path.dentry->d_inode;
|
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struct page *page;
|
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int status;
|
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|
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dfprintk(DIRCACHE, "NFS: %s: searching page %ld for target %Lu\n",
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__func__, desc->page_index,
|
||||
(long long) *desc->dir_cookie);
|
||||
|
||||
/* If we find the page in the page_cache, we cannot be sure
|
||||
* how fresh the data is, so we will ignore readdir_plus attributes.
|
||||
*/
|
||||
desc->timestamp_valid = 0;
|
||||
page = read_cache_page(inode->i_mapping, desc->page_index,
|
||||
(filler_t *)nfs_readdir_filler, desc);
|
||||
if (IS_ERR(page)) {
|
||||
status = PTR_ERR(page);
|
||||
goto out;
|
||||
}
|
||||
|
||||
/* NOTE: Someone else may have changed the READDIRPLUS flag */
|
||||
desc->page = page;
|
||||
desc->ptr = kmap(page); /* matching kunmap in nfs_do_filldir */
|
||||
if (*desc->dir_cookie != 0)
|
||||
status = find_dirent(desc);
|
||||
else
|
||||
status = find_dirent_index(desc);
|
||||
if (status < 0)
|
||||
dir_page_release(desc);
|
||||
out:
|
||||
dfprintk(DIRCACHE, "NFS: %s: returns %d\n", __func__, status);
|
||||
return status;
|
||||
}
|
||||
|
||||
/*
|
||||
* 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->dir_cookie' if non-0,
|
||||
* 'desc->file->f_pos' otherwise
|
||||
*/
|
||||
/* Search for desc->dir_cookie from the beginning of the page cache */
|
||||
static inline
|
||||
int readdir_search_pagecache(nfs_readdir_descriptor_t *desc)
|
||||
{
|
||||
int loop_count = 0;
|
||||
int res;
|
||||
int res = -EAGAIN;
|
||||
desc->page_index = 0;
|
||||
|
||||
/* Always search-by-index from the beginning of the cache */
|
||||
if (*desc->dir_cookie == 0) {
|
||||
dfprintk(DIRCACHE, "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(DIRCACHE, "NFS: readdir_search_pagecache() searching for cookie %Lu\n",
|
||||
(unsigned long long)*desc->dir_cookie);
|
||||
if (*desc->dir_cookie == 0)
|
||||
desc->cache_entry_index = 0;
|
||||
|
||||
for (;;) {
|
||||
res = find_dirent_page(desc);
|
||||
while (1) {
|
||||
res = find_cache_page(desc);
|
||||
if (res != -EAGAIN)
|
||||
break;
|
||||
/* Align to beginning of next page */
|
||||
desc->page_index ++;
|
||||
if (loop_count++ > 200) {
|
||||
loop_count = 0;
|
||||
schedule();
|
||||
}
|
||||
desc->page_index++;
|
||||
}
|
||||
|
||||
dfprintk(DIRCACHE, "NFS: %s: returns %d\n", __func__, res);
|
||||
return res;
|
||||
}
|
||||
|
||||
|
|
@ -401,8 +510,6 @@ static inline unsigned int dt_type(struct inode *inode)
|
|||
return (inode->i_mode >> 12) & 15;
|
||||
}
|
||||
|
||||
static struct dentry *nfs_readdir_lookup(nfs_readdir_descriptor_t *desc);
|
||||
|
||||
/*
|
||||
* Once we've found the start of the dirent within a page: fill 'er up...
|
||||
*/
|
||||
|
|
@ -411,49 +518,36 @@ int nfs_do_filldir(nfs_readdir_descriptor_t *desc, void *dirent,
|
|||
filldir_t filldir)
|
||||
{
|
||||
struct file *file = desc->file;
|
||||
struct nfs_entry *entry = desc->entry;
|
||||
struct dentry *dentry = NULL;
|
||||
u64 fileid;
|
||||
int loop_count = 0,
|
||||
res;
|
||||
int i = 0;
|
||||
int res = 0;
|
||||
struct nfs_cache_array *array = NULL;
|
||||
unsigned int d_type = DT_UNKNOWN;
|
||||
struct dentry *dentry = NULL;
|
||||
|
||||
dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling starting @ cookie %Lu\n",
|
||||
(unsigned long long)entry->cookie);
|
||||
array = nfs_readdir_get_array(desc->page);
|
||||
|
||||
for(;;) {
|
||||
unsigned d_type = DT_UNKNOWN;
|
||||
/* Note: entry->prev_cookie contains the cookie for
|
||||
* retrieving the current dirent on the server */
|
||||
fileid = entry->ino;
|
||||
for (i = desc->cache_entry_index; i < array->size; i++) {
|
||||
d_type = DT_UNKNOWN;
|
||||
|
||||
/* Get a dentry if we have one */
|
||||
if (dentry != NULL)
|
||||
dput(dentry);
|
||||
dentry = nfs_readdir_lookup(desc);
|
||||
|
||||
/* Use readdirplus info */
|
||||
if (dentry != NULL && dentry->d_inode != NULL) {
|
||||
d_type = dt_type(dentry->d_inode);
|
||||
fileid = NFS_FILEID(dentry->d_inode);
|
||||
}
|
||||
|
||||
res = filldir(dirent, entry->name, entry->len,
|
||||
file->f_pos, nfs_compat_user_ino64(fileid),
|
||||
d_type);
|
||||
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)
|
||||
break;
|
||||
file->f_pos++;
|
||||
*desc->dir_cookie = entry->cookie;
|
||||
if (dir_decode(desc) != 0) {
|
||||
desc->page_index ++;
|
||||
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 (loop_count++ > 200) {
|
||||
loop_count = 0;
|
||||
schedule();
|
||||
}
|
||||
}
|
||||
dir_page_release(desc);
|
||||
|
||||
nfs_readdir_release_array(desc->page);
|
||||
cache_page_release(desc);
|
||||
if (dentry != NULL)
|
||||
dput(dentry);
|
||||
dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n",
|
||||
|
|
@ -477,12 +571,9 @@ static inline
|
|||
int uncached_readdir(nfs_readdir_descriptor_t *desc, void *dirent,
|
||||
filldir_t filldir)
|
||||
{
|
||||
struct file *file = desc->file;
|
||||
struct inode *inode = file->f_path.dentry->d_inode;
|
||||
struct rpc_cred *cred = nfs_file_cred(file);
|
||||
struct page *page = NULL;
|
||||
int status;
|
||||
unsigned long timestamp, gencount;
|
||||
struct inode *inode = desc->file->f_path.dentry->d_inode;
|
||||
|
||||
dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %Lu\n",
|
||||
(unsigned long long)*desc->dir_cookie);
|
||||
|
|
@ -492,38 +583,21 @@ int uncached_readdir(nfs_readdir_descriptor_t *desc, void *dirent,
|
|||
status = -ENOMEM;
|
||||
goto out;
|
||||
}
|
||||
timestamp = jiffies;
|
||||
gencount = nfs_inc_attr_generation_counter();
|
||||
status = NFS_PROTO(inode)->readdir(file->f_path.dentry, cred,
|
||||
*desc->dir_cookie, page,
|
||||
NFS_SERVER(inode)->dtsize,
|
||||
desc->plus);
|
||||
desc->page = page;
|
||||
desc->ptr = kmap(page); /* matching kunmap in nfs_do_filldir */
|
||||
if (status >= 0) {
|
||||
desc->timestamp = timestamp;
|
||||
desc->gencount = gencount;
|
||||
desc->timestamp_valid = 1;
|
||||
if ((status = dir_decode(desc)) == 0)
|
||||
desc->entry->prev_cookie = *desc->dir_cookie;
|
||||
} else
|
||||
status = -EIO;
|
||||
if (status < 0)
|
||||
goto out_release;
|
||||
|
||||
if (nfs_readdir_xdr_to_array(desc, page, inode) == -1) {
|
||||
status = -EIO;
|
||||
goto out_release;
|
||||
}
|
||||
|
||||
desc->page = page;
|
||||
status = nfs_do_filldir(desc, dirent, filldir);
|
||||
|
||||
/* Reset read descriptor so it searches the page cache from
|
||||
* the start upon the next call to readdir_search_pagecache() */
|
||||
desc->page_index = 0;
|
||||
desc->entry->cookie = desc->entry->prev_cookie = 0;
|
||||
desc->entry->eof = 0;
|
||||
out:
|
||||
dfprintk(DIRCACHE, "NFS: %s: returns %d\n",
|
||||
__func__, status);
|
||||
return status;
|
||||
out_release:
|
||||
dir_page_release(desc);
|
||||
cache_page_release(desc);
|
||||
goto out;
|
||||
}
|
||||
|
||||
|
|
@ -537,7 +611,6 @@ 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;
|
||||
struct nfs_entry my_entry;
|
||||
int res = -ENOMEM;
|
||||
|
||||
dfprintk(FILE, "NFS: readdir(%s/%s) starting at cookie %llu\n",
|
||||
|
|
@ -558,26 +631,17 @@ static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
|
|||
desc->decode = NFS_PROTO(inode)->decode_dirent;
|
||||
desc->plus = NFS_USE_READDIRPLUS(inode);
|
||||
|
||||
my_entry.cookie = my_entry.prev_cookie = 0;
|
||||
my_entry.eof = 0;
|
||||
my_entry.fh = nfs_alloc_fhandle();
|
||||
my_entry.fattr = nfs_alloc_fattr();
|
||||
if (my_entry.fh == NULL || my_entry.fattr == NULL)
|
||||
goto out_alloc_failed;
|
||||
|
||||
desc->entry = &my_entry;
|
||||
|
||||
nfs_block_sillyrename(dentry);
|
||||
res = nfs_revalidate_mapping(inode, filp->f_mapping);
|
||||
if (res < 0)
|
||||
goto out;
|
||||
|
||||
while(!desc->entry->eof) {
|
||||
while (desc->eof != 1) {
|
||||
res = readdir_search_pagecache(desc);
|
||||
|
||||
if (res == -EBADCOOKIE) {
|
||||
/* This means either end of directory */
|
||||
if (*desc->dir_cookie && desc->entry->cookie != *desc->dir_cookie) {
|
||||
if (*desc->dir_cookie && desc->eof == 0) {
|
||||
/* Or that the server has 'lost' a cookie */
|
||||
res = uncached_readdir(desc, dirent, filldir);
|
||||
if (res >= 0)
|
||||
|
|
@ -590,7 +654,7 @@ static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
|
|||
clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags);
|
||||
nfs_zap_caches(inode);
|
||||
desc->plus = 0;
|
||||
desc->entry->eof = 0;
|
||||
desc->eof = 0;
|
||||
continue;
|
||||
}
|
||||
if (res < 0)
|
||||
|
|
@ -606,9 +670,6 @@ static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
|
|||
nfs_unblock_sillyrename(dentry);
|
||||
if (res > 0)
|
||||
res = 0;
|
||||
out_alloc_failed:
|
||||
nfs_free_fattr(my_entry.fattr);
|
||||
nfs_free_fhandle(my_entry.fh);
|
||||
dfprintk(FILE, "NFS: readdir(%s/%s) returns %d\n",
|
||||
dentry->d_parent->d_name.name, dentry->d_name.name,
|
||||
res);
|
||||
|
|
@ -1292,81 +1353,6 @@ static int nfs_open_create(struct inode *dir, struct dentry *dentry, int mode,
|
|||
|
||||
#endif /* CONFIG_NFSV4 */
|
||||
|
||||
static struct dentry *nfs_readdir_lookup(nfs_readdir_descriptor_t *desc)
|
||||
{
|
||||
struct dentry *parent = desc->file->f_path.dentry;
|
||||
struct inode *dir = parent->d_inode;
|
||||
struct nfs_entry *entry = desc->entry;
|
||||
struct dentry *dentry, *alias;
|
||||
struct qstr name = {
|
||||
.name = entry->name,
|
||||
.len = entry->len,
|
||||
};
|
||||
struct inode *inode;
|
||||
unsigned long verf = nfs_save_change_attribute(dir);
|
||||
|
||||
switch (name.len) {
|
||||
case 2:
|
||||
if (name.name[0] == '.' && name.name[1] == '.')
|
||||
return dget_parent(parent);
|
||||
break;
|
||||
case 1:
|
||||
if (name.name[0] == '.')
|
||||
return dget(parent);
|
||||
}
|
||||
|
||||
spin_lock(&dir->i_lock);
|
||||
if (NFS_I(dir)->cache_validity & NFS_INO_INVALID_DATA) {
|
||||
spin_unlock(&dir->i_lock);
|
||||
return NULL;
|
||||
}
|
||||
spin_unlock(&dir->i_lock);
|
||||
|
||||
name.hash = full_name_hash(name.name, name.len);
|
||||
dentry = d_lookup(parent, &name);
|
||||
if (dentry != NULL) {
|
||||
/* Is this a positive dentry that matches the readdir info? */
|
||||
if (dentry->d_inode != NULL &&
|
||||
(NFS_FILEID(dentry->d_inode) == entry->ino ||
|
||||
d_mountpoint(dentry))) {
|
||||
if (!desc->plus || entry->fh->size == 0)
|
||||
return dentry;
|
||||
if (nfs_compare_fh(NFS_FH(dentry->d_inode),
|
||||
entry->fh) == 0)
|
||||
goto out_renew;
|
||||
}
|
||||
/* No, so d_drop to allow one to be created */
|
||||
d_drop(dentry);
|
||||
dput(dentry);
|
||||
}
|
||||
if (!desc->plus || !(entry->fattr->valid & NFS_ATTR_FATTR))
|
||||
return NULL;
|
||||
if (name.len > NFS_SERVER(dir)->namelen)
|
||||
return NULL;
|
||||
/* Note: caller is already holding the dir->i_mutex! */
|
||||
dentry = d_alloc(parent, &name);
|
||||
if (dentry == NULL)
|
||||
return NULL;
|
||||
dentry->d_op = NFS_PROTO(dir)->dentry_ops;
|
||||
inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr);
|
||||
if (IS_ERR(inode)) {
|
||||
dput(dentry);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
alias = d_materialise_unique(dentry, inode);
|
||||
if (alias != NULL) {
|
||||
dput(dentry);
|
||||
if (IS_ERR(alias))
|
||||
return NULL;
|
||||
dentry = alias;
|
||||
}
|
||||
|
||||
out_renew:
|
||||
nfs_set_verifier(dentry, verf);
|
||||
return dentry;
|
||||
}
|
||||
|
||||
/*
|
||||
* Code common to create, mkdir, and mknod.
|
||||
*/
|
||||
|
|
|
|||
Loading…
Reference in a new issue