forked from luck/tmp_suning_uos_patched
nfs: switch to ->iterate_shared()
aside of the usual care about seeding dcache from readdir, we need to be careful about the pagecache evictions here. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
parent
9cf843e3f4
commit
9ac3d3e846
71
fs/nfs/dir.c
71
fs/nfs/dir.c
|
|
@ -57,7 +57,7 @@ static void nfs_readdir_clear_array(struct page*);
|
|||
const struct file_operations nfs_dir_operations = {
|
||||
.llseek = nfs_llseek_dir,
|
||||
.read = generic_read_dir,
|
||||
.iterate = nfs_readdir,
|
||||
.iterate_shared = nfs_readdir,
|
||||
.open = nfs_opendir,
|
||||
.release = nfs_closedir,
|
||||
.fsync = nfs_fsync_dir,
|
||||
|
|
@ -145,6 +145,7 @@ struct nfs_cache_array_entry {
|
|||
};
|
||||
|
||||
struct nfs_cache_array {
|
||||
atomic_t refcount;
|
||||
int size;
|
||||
int eof_index;
|
||||
u64 last_cookie;
|
||||
|
|
@ -200,11 +201,20 @@ void nfs_readdir_clear_array(struct page *page)
|
|||
int i;
|
||||
|
||||
array = kmap_atomic(page);
|
||||
for (i = 0; i < array->size; i++)
|
||||
kfree(array->array[i].string.name);
|
||||
if (atomic_dec_and_test(&array->refcount))
|
||||
for (i = 0; i < array->size; i++)
|
||||
kfree(array->array[i].string.name);
|
||||
kunmap_atomic(array);
|
||||
}
|
||||
|
||||
static bool grab_page(struct page *page)
|
||||
{
|
||||
struct nfs_cache_array *array = kmap_atomic(page);
|
||||
bool res = atomic_inc_not_zero(&array->refcount);
|
||||
kunmap_atomic(array);
|
||||
return res;
|
||||
}
|
||||
|
||||
/*
|
||||
* the caller is responsible for freeing qstr.name
|
||||
* when called by nfs_readdir_add_to_array, the strings will be freed in
|
||||
|
|
@ -470,6 +480,7 @@ static
|
|||
void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry)
|
||||
{
|
||||
struct qstr filename = QSTR_INIT(entry->name, entry->len);
|
||||
DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
|
||||
struct dentry *dentry;
|
||||
struct dentry *alias;
|
||||
struct inode *dir = d_inode(parent);
|
||||
|
|
@ -489,7 +500,13 @@ void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry)
|
|||
filename.hash = full_name_hash(filename.name, filename.len);
|
||||
|
||||
dentry = d_lookup(parent, &filename);
|
||||
if (dentry != NULL) {
|
||||
again:
|
||||
if (!dentry) {
|
||||
dentry = d_alloc_parallel(parent, &filename, &wq);
|
||||
if (IS_ERR(dentry))
|
||||
return;
|
||||
}
|
||||
if (!d_in_lookup(dentry)) {
|
||||
/* Is there a mountpoint here? If so, just exit */
|
||||
if (!nfs_fsid_equal(&NFS_SB(dentry->d_sb)->fsid,
|
||||
&entry->fattr->fsid))
|
||||
|
|
@ -503,26 +520,21 @@ void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry)
|
|||
} else {
|
||||
d_invalidate(dentry);
|
||||
dput(dentry);
|
||||
dentry = NULL;
|
||||
goto again;
|
||||
}
|
||||
}
|
||||
|
||||
dentry = d_alloc(parent, &filename);
|
||||
if (dentry == NULL)
|
||||
return;
|
||||
|
||||
inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr, entry->label);
|
||||
if (IS_ERR(inode))
|
||||
goto out;
|
||||
|
||||
alias = d_splice_alias(inode, dentry);
|
||||
if (IS_ERR(alias))
|
||||
goto out;
|
||||
else if (alias) {
|
||||
nfs_set_verifier(alias, nfs_save_change_attribute(dir));
|
||||
dput(alias);
|
||||
} else
|
||||
nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
|
||||
|
||||
d_lookup_done(dentry);
|
||||
if (alias) {
|
||||
if (IS_ERR(alias))
|
||||
goto out;
|
||||
dput(dentry);
|
||||
dentry = alias;
|
||||
}
|
||||
nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
|
||||
out:
|
||||
dput(dentry);
|
||||
}
|
||||
|
|
@ -643,6 +655,7 @@ int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page,
|
|||
goto out_label_free;
|
||||
}
|
||||
memset(array, 0, sizeof(struct nfs_cache_array));
|
||||
atomic_set(&array->refcount, 1);
|
||||
array->eof_index = -1;
|
||||
|
||||
status = nfs_readdir_alloc_pages(pages, array_size);
|
||||
|
|
@ -705,8 +718,7 @@ int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page* page)
|
|||
static
|
||||
void cache_page_release(nfs_readdir_descriptor_t *desc)
|
||||
{
|
||||
if (!desc->page->mapping)
|
||||
nfs_readdir_clear_array(desc->page);
|
||||
nfs_readdir_clear_array(desc->page);
|
||||
put_page(desc->page);
|
||||
desc->page = NULL;
|
||||
}
|
||||
|
|
@ -714,8 +726,16 @@ void cache_page_release(nfs_readdir_descriptor_t *desc)
|
|||
static
|
||||
struct page *get_cache_page(nfs_readdir_descriptor_t *desc)
|
||||
{
|
||||
return read_cache_page(file_inode(desc->file)->i_mapping,
|
||||
struct page *page;
|
||||
|
||||
for (;;) {
|
||||
page = read_cache_page(file_inode(desc->file)->i_mapping,
|
||||
desc->page_index, (filler_t *)nfs_readdir_filler, desc);
|
||||
if (IS_ERR(page) || grab_page(page))
|
||||
break;
|
||||
put_page(page);
|
||||
}
|
||||
return page;
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -934,13 +954,11 @@ static int nfs_readdir(struct file *file, struct dir_context *ctx)
|
|||
|
||||
static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int whence)
|
||||
{
|
||||
struct inode *inode = file_inode(filp);
|
||||
struct nfs_open_dir_context *dir_ctx = filp->private_data;
|
||||
|
||||
dfprintk(FILE, "NFS: llseek dir(%pD2, %lld, %d)\n",
|
||||
filp, offset, whence);
|
||||
|
||||
inode_lock(inode);
|
||||
switch (whence) {
|
||||
case 1:
|
||||
offset += filp->f_pos;
|
||||
|
|
@ -948,16 +966,13 @@ static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int whence)
|
|||
if (offset >= 0)
|
||||
break;
|
||||
default:
|
||||
offset = -EINVAL;
|
||||
goto out;
|
||||
return -EINVAL;
|
||||
}
|
||||
if (offset != filp->f_pos) {
|
||||
filp->f_pos = offset;
|
||||
dir_ctx->dir_cookie = 0;
|
||||
dir_ctx->duped = 0;
|
||||
}
|
||||
out:
|
||||
inode_unlock(inode);
|
||||
return offset;
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user