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Diffstat (limited to 'fs/nfs/dir.c')
-rw-r--r--fs/nfs/dir.c83
1 files changed, 58 insertions, 25 deletions
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index e180033e35cf..1320288ff9ec 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -58,7 +58,7 @@ 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,
@@ -162,6 +162,17 @@ typedef struct {
bool eof;
} nfs_readdir_descriptor_t;
+static
+void nfs_readdir_init_array(struct page *page)
+{
+ struct nfs_cache_array *array;
+
+ array = kmap_atomic(page);
+ memset(array, 0, sizeof(struct nfs_cache_array));
+ array->eof_index = -1;
+ kunmap_atomic(array);
+}
+
/*
* we are freeing strings created by nfs_add_to_readdir_array()
*/
@@ -174,6 +185,7 @@ 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);
+ array->size = 0;
kunmap_atomic(array);
}
@@ -186,7 +198,7 @@ static
int nfs_readdir_make_qstr(struct qstr *string, const char *name, unsigned int len)
{
string->len = len;
- string->name = kmemdup(name, len, GFP_KERNEL);
+ string->name = kmemdup_nul(name, len, GFP_KERNEL);
if (string->name == NULL)
return -ENOMEM;
/*
@@ -437,7 +449,8 @@ void nfs_force_use_readdirplus(struct inode *dir)
if (nfs_server_capable(dir, NFS_CAP_READDIRPLUS) &&
!list_empty(&nfsi->open_files)) {
set_bit(NFS_INO_ADVISE_RDPLUS, &nfsi->flags);
- invalidate_mapping_pages(dir->i_mapping, 0, -1);
+ invalidate_mapping_pages(dir->i_mapping,
+ nfsi->page_index + 1, -1);
}
}
@@ -610,6 +623,8 @@ int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page,
int status = -ENOMEM;
unsigned int array_size = ARRAY_SIZE(pages);
+ nfs_readdir_init_array(page);
+
entry.prev_cookie = 0;
entry.cookie = desc->last_cookie;
entry.eof = 0;
@@ -626,8 +641,6 @@ int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page,
}
array = kmap(page);
- memset(array, 0, sizeof(struct nfs_cache_array));
- array->eof_index = -1;
status = nfs_readdir_alloc_pages(pages, array_size);
if (status < 0)
@@ -682,6 +695,7 @@ int nfs_readdir_filler(void *data, struct page* page)
unlock_page(page);
return 0;
error:
+ nfs_readdir_clear_array(page);
unlock_page(page);
return ret;
}
@@ -689,8 +703,6 @@ int nfs_readdir_filler(void *data, struct page* page)
static
void cache_page_release(nfs_readdir_descriptor_t *desc)
{
- if (!desc->page->mapping)
- nfs_readdir_clear_array(desc->page);
put_page(desc->page);
desc->page = NULL;
}
@@ -704,19 +716,32 @@ struct page *get_cache_page(nfs_readdir_descriptor_t *desc)
/*
* Returns 0 if desc->dir_cookie was found on page desc->page_index
+ * and locks the page to prevent removal from the page cache.
*/
static
-int find_cache_page(nfs_readdir_descriptor_t *desc)
+int find_and_lock_cache_page(nfs_readdir_descriptor_t *desc)
{
+ struct inode *inode = file_inode(desc->file);
+ struct nfs_inode *nfsi = NFS_I(inode);
int res;
desc->page = get_cache_page(desc);
if (IS_ERR(desc->page))
return PTR_ERR(desc->page);
-
- res = nfs_readdir_search_array(desc);
+ res = lock_page_killable(desc->page);
if (res != 0)
- cache_page_release(desc);
+ goto error;
+ res = -EAGAIN;
+ if (desc->page->mapping != NULL) {
+ res = nfs_readdir_search_array(desc);
+ if (res == 0) {
+ nfsi->page_index = desc->page_index;
+ return 0;
+ }
+ }
+ unlock_page(desc->page);
+error:
+ cache_page_release(desc);
return res;
}
@@ -731,7 +756,7 @@ int readdir_search_pagecache(nfs_readdir_descriptor_t *desc)
desc->last_cookie = 0;
}
do {
- res = find_cache_page(desc);
+ res = find_and_lock_cache_page(desc);
} while (res == -EAGAIN);
return res;
}
@@ -770,7 +795,6 @@ int nfs_do_filldir(nfs_readdir_descriptor_t *desc)
desc->eof = true;
kunmap(desc->page);
- cache_page_release(desc);
dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n",
(unsigned long long)*desc->dir_cookie, res);
return res;
@@ -816,13 +840,13 @@ int uncached_readdir(nfs_readdir_descriptor_t *desc)
status = nfs_do_filldir(desc);
+ out_release:
+ nfs_readdir_clear_array(desc->page);
+ cache_page_release(desc);
out:
dfprintk(DIRCACHE, "NFS: %s: returns %d\n",
__func__, status);
return status;
- out_release:
- cache_page_release(desc);
- goto out;
}
/* The file offset position represents the dirent entry number. A
@@ -887,6 +911,8 @@ static int nfs_readdir(struct file *file, struct dir_context *ctx)
break;
res = nfs_do_filldir(desc);
+ unlock_page(desc->page);
+ cache_page_release(desc);
if (res < 0)
break;
} while (!desc->eof);
@@ -1142,10 +1168,17 @@ nfs_lookup_revalidate_dentry(struct inode *dir, struct dentry *dentry,
if (fhandle == NULL || fattr == NULL || IS_ERR(label))
goto out;
- ret = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, label);
+ ret = NFS_PROTO(dir)->lookup(dir, dentry, fhandle, fattr, label);
if (ret < 0) {
- if (ret == -ESTALE || ret == -ENOENT)
+ switch (ret) {
+ case -ESTALE:
+ case -ENOENT:
ret = 0;
+ break;
+ case -ETIMEDOUT:
+ if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL)
+ ret = 1;
+ }
goto out;
}
ret = 0;
@@ -1408,7 +1441,7 @@ struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, unsigned in
goto out;
trace_nfs_lookup_enter(dir, dentry, flags);
- error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, label);
+ error = NFS_PROTO(dir)->lookup(dir, dentry, fhandle, fattr, label);
if (error == -ENOENT)
goto no_entry;
if (error < 0) {
@@ -1683,7 +1716,7 @@ nfs_add_or_obtain(struct dentry *dentry, struct nfs_fh *fhandle,
d_drop(dentry);
if (fhandle->size == 0) {
- error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, NULL);
+ error = NFS_PROTO(dir)->lookup(dir, dentry, fhandle, fattr, NULL);
if (error)
goto out_error;
}
@@ -2312,11 +2345,11 @@ static int nfs_access_get_cached(struct inode *inode, const struct cred *cred, s
/* Found an entry, is our attribute cache valid? */
if (!nfs_check_cache_invalid(inode, NFS_INO_INVALID_ACCESS))
break;
+ if (!retry)
+ break;
err = -ECHILD;
if (!may_block)
goto out;
- if (!retry)
- goto out_zap;
spin_unlock(&inode->i_lock);
err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
if (err)
@@ -2353,7 +2386,7 @@ static int nfs_access_get_cached_rcu(struct inode *inode, const struct cred *cre
lh = rcu_dereference(nfsi->access_cache_entry_lru.prev);
cache = list_entry(lh, struct nfs_access_entry, lru);
if (lh == &nfsi->access_cache_entry_lru ||
- cred != cache->cred)
+ cred_fscmp(cred, cache->cred) != 0)
cache = NULL;
if (cache == NULL)
goto out;
@@ -2476,7 +2509,7 @@ static int nfs_do_access(struct inode *inode, const struct cred *cred, int mask)
{
struct nfs_access_entry cache;
bool may_block = (mask & MAY_NOT_BLOCK) == 0;
- int cache_mask;
+ int cache_mask = -1;
int status;
trace_nfs_access_enter(inode);
@@ -2515,7 +2548,7 @@ out_cached:
if ((mask & ~cache_mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) != 0)
status = -EACCES;
out:
- trace_nfs_access_exit(inode, status);
+ trace_nfs_access_exit(inode, mask, cache_mask, status);
return status;
}
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-25 03:53:03 +0300