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-rw-r--r--fs/afs/write.c161
1 files changed, 101 insertions, 60 deletions
diff --git a/fs/afs/write.c b/fs/afs/write.c
index cb76566763db..7437806332d9 100644
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -194,11 +194,11 @@ int afs_write_end(struct file *file, struct address_space *mapping,
i_size = i_size_read(&vnode->vfs_inode);
if (maybe_i_size > i_size) {
- spin_lock(&vnode->wb_lock);
+ write_seqlock(&vnode->cb_lock);
i_size = i_size_read(&vnode->vfs_inode);
if (maybe_i_size > i_size)
i_size_write(&vnode->vfs_inode, maybe_i_size);
- spin_unlock(&vnode->wb_lock);
+ write_sequnlock(&vnode->cb_lock);
}
if (!PageUptodate(page)) {
@@ -349,82 +349,113 @@ static void afs_pages_written_back(struct afs_vnode *vnode,
}
/*
- * write to a file
+ * Find a key to use for the writeback. We cached the keys used to author the
+ * writes on the vnode. *_wbk will contain the last writeback key used or NULL
+ * and we need to start from there if it's set.
*/
-static int afs_store_data(struct address_space *mapping,
- pgoff_t first, pgoff_t last,
- unsigned offset, unsigned to)
+static int afs_get_writeback_key(struct afs_vnode *vnode,
+ struct afs_wb_key **_wbk)
{
- struct afs_vnode *vnode = AFS_FS_I(mapping->host);
- struct afs_fs_cursor fc;
- struct afs_status_cb *scb;
struct afs_wb_key *wbk = NULL;
struct list_head *p;
int ret = -ENOKEY, ret2;
- _enter("%s{%llx:%llu.%u},%lx,%lx,%x,%x",
- vnode->volume->name,
- vnode->fid.vid,
- vnode->fid.vnode,
- vnode->fid.unique,
- first, last, offset, to);
-
- scb = kzalloc(sizeof(struct afs_status_cb), GFP_NOFS);
- if (!scb)
- return -ENOMEM;
-
spin_lock(&vnode->wb_lock);
- p = vnode->wb_keys.next;
+ if (*_wbk)
+ p = (*_wbk)->vnode_link.next;
+ else
+ p = vnode->wb_keys.next;
- /* Iterate through the list looking for a valid key to use. */
-try_next_key:
while (p != &vnode->wb_keys) {
wbk = list_entry(p, struct afs_wb_key, vnode_link);
_debug("wbk %u", key_serial(wbk->key));
ret2 = key_validate(wbk->key);
- if (ret2 == 0)
- goto found_key;
+ if (ret2 == 0) {
+ refcount_inc(&wbk->usage);
+ _debug("USE WB KEY %u", key_serial(wbk->key));
+ break;
+ }
+
+ wbk = NULL;
if (ret == -ENOKEY)
ret = ret2;
p = p->next;
}
spin_unlock(&vnode->wb_lock);
- afs_put_wb_key(wbk);
- kfree(scb);
- _leave(" = %d [no keys]", ret);
- return ret;
+ if (*_wbk)
+ afs_put_wb_key(*_wbk);
+ *_wbk = wbk;
+ return 0;
+}
-found_key:
- refcount_inc(&wbk->usage);
- spin_unlock(&vnode->wb_lock);
+static void afs_store_data_success(struct afs_operation *op)
+{
+ struct afs_vnode *vnode = op->file[0].vnode;
- _debug("USE WB KEY %u", key_serial(wbk->key));
+ op->ctime = op->file[0].scb.status.mtime_client;
+ afs_vnode_commit_status(op, &op->file[0]);
+ if (op->error == 0) {
+ afs_pages_written_back(vnode, op->store.first, op->store.last);
+ afs_stat_v(vnode, n_stores);
+ atomic_long_add((op->store.last * PAGE_SIZE + op->store.last_to) -
+ (op->store.first * PAGE_SIZE + op->store.first_offset),
+ &afs_v2net(vnode)->n_store_bytes);
+ }
+}
- ret = -ERESTARTSYS;
- if (afs_begin_vnode_operation(&fc, vnode, wbk->key, false)) {
- afs_dataversion_t data_version = vnode->status.data_version + 1;
+static const struct afs_operation_ops afs_store_data_operation = {
+ .issue_afs_rpc = afs_fs_store_data,
+ .issue_yfs_rpc = yfs_fs_store_data,
+ .success = afs_store_data_success,
+};
- while (afs_select_fileserver(&fc)) {
- fc.cb_break = afs_calc_vnode_cb_break(vnode);
- afs_fs_store_data(&fc, mapping, first, last, offset, to, scb);
- }
+/*
+ * write to a file
+ */
+static int afs_store_data(struct address_space *mapping,
+ pgoff_t first, pgoff_t last,
+ unsigned offset, unsigned to)
+{
+ struct afs_vnode *vnode = AFS_FS_I(mapping->host);
+ struct afs_operation *op;
+ struct afs_wb_key *wbk = NULL;
+ int ret;
- afs_check_for_remote_deletion(&fc, vnode);
- afs_vnode_commit_status(&fc, vnode, fc.cb_break,
- &data_version, scb);
- if (fc.ac.error == 0)
- afs_pages_written_back(vnode, first, last);
- ret = afs_end_vnode_operation(&fc);
+ _enter("%s{%llx:%llu.%u},%lx,%lx,%x,%x",
+ vnode->volume->name,
+ vnode->fid.vid,
+ vnode->fid.vnode,
+ vnode->fid.unique,
+ first, last, offset, to);
+
+ ret = afs_get_writeback_key(vnode, &wbk);
+ if (ret) {
+ _leave(" = %d [no keys]", ret);
+ return ret;
}
- switch (ret) {
- case 0:
- afs_stat_v(vnode, n_stores);
- atomic_long_add((last * PAGE_SIZE + to) -
- (first * PAGE_SIZE + offset),
- &afs_v2net(vnode)->n_store_bytes);
- break;
+ op = afs_alloc_operation(wbk->key, vnode->volume);
+ if (IS_ERR(op)) {
+ afs_put_wb_key(wbk);
+ return -ENOMEM;
+ }
+
+ afs_op_set_vnode(op, 0, vnode);
+ op->file[0].dv_delta = 1;
+ op->store.mapping = mapping;
+ op->store.first = first;
+ op->store.last = last;
+ op->store.first_offset = offset;
+ op->store.last_to = to;
+ op->mtime = vnode->vfs_inode.i_mtime;
+ op->ops = &afs_store_data_operation;
+
+try_next_key:
+ afs_begin_vnode_operation(op);
+ afs_wait_for_operation(op);
+
+ switch (op->error) {
case -EACCES:
case -EPERM:
case -ENOKEY:
@@ -432,16 +463,19 @@ found_key:
case -EKEYREJECTED:
case -EKEYREVOKED:
_debug("next");
- spin_lock(&vnode->wb_lock);
- p = wbk->vnode_link.next;
- afs_put_wb_key(wbk);
- goto try_next_key;
+
+ ret = afs_get_writeback_key(vnode, &wbk);
+ if (ret == 0) {
+ key_put(op->key);
+ op->key = key_get(wbk->key);
+ goto try_next_key;
+ }
+ break;
}
afs_put_wb_key(wbk);
- kfree(scb);
- _leave(" = %d", ret);
- return ret;
+ _leave(" = %d", op->error);
+ return afs_put_operation(op);
}
/*
@@ -458,6 +492,7 @@ static int afs_write_back_from_locked_page(struct address_space *mapping,
unsigned long count, priv;
unsigned n, offset, to, f, t;
pgoff_t start, first, last;
+ loff_t i_size, end;
int loop, ret;
_enter(",%lx", primary_page->index);
@@ -558,7 +593,12 @@ no_more:
first = primary_page->index;
last = first + count - 1;
+ end = (loff_t)last * PAGE_SIZE + to;
+ i_size = i_size_read(&vnode->vfs_inode);
+
_debug("write back %lx[%u..] to %lx[..%u]", first, offset, last, to);
+ if (end > i_size)
+ to = i_size & ~PAGE_MASK;
ret = afs_store_data(mapping, first, last, offset, to);
switch (ret) {
@@ -811,6 +851,7 @@ vm_fault_t afs_page_mkwrite(struct vm_fault *vmf)
vmf->page->index, priv);
SetPagePrivate(vmf->page);
set_page_private(vmf->page, priv);
+ file_update_time(file);
sb_end_pagefault(inode->i_sb);
return VM_FAULT_LOCKED;