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NFS: Replace custom error reporting mechanism with generic one 

Replace the NFS custom error reporting mechanism with the generic
mapping_set_error().

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust 2019-04-07 13:59:05 -04:00 committed by Anna Schumaker
parent aded8d7b54
commit 6fbda89b25
4 changed files with 26 additions and 46 deletions
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25
fs/nfs/file.c
View File

@ -199,13 +199,6 @@ EXPORT_SYMBOL_GPL(nfs_file_mmap);
* Flush any dirty pages for this process, and check for write errors.
* The return status from this call provides a reliable indication of
* whether any write errors occurred for this process.
*
* Notice that it clears the NFS_CONTEXT_ERROR_WRITE before synching to
* disk, but it retrieves and clears ctx->error after synching, despite
* the two being set at the same time in nfs_context_set_write_error().
* This is because the former is used to notify the _next_ call to
* nfs_file_write() that a write error occurred, and hence cause it to
* fall back to doing a synchronous write.
*/
static int
nfs_file_fsync_commit(struct file *file, int datasync)
@ -220,11 +213,8 @@ nfs_file_fsync_commit(struct file *file, int datasync)
nfs_inc_stats(inode, NFSIOS_VFSFSYNC);
do_resend = test_and_clear_bit(NFS_CONTEXT_RESEND_WRITES, &ctx->flags);
status = nfs_commit_inode(inode, FLUSH_SYNC);
if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags)) {
ret = xchg(&ctx->error, 0);
if (ret)
goto out;
}
if (status == 0)
status = file_check_and_advance_wb_err(file);
if (status < 0) {
ret = status;
goto out;
@ -245,13 +235,7 @@ nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
trace_nfs_fsync_enter(inode);
do {
struct nfs_open_context *ctx = nfs_file_open_context(file);
ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
if (test_and_clear_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags)) {
int ret2 = xchg(&ctx->error, 0);
if (ret2)
ret = ret2;
}
ret = file_write_and_wait_range(file, start, end);
if (ret != 0)
break;
ret = nfs_file_fsync_commit(file, datasync);
@ -600,8 +584,7 @@ static int nfs_need_check_write(struct file *filp, struct inode *inode)
struct nfs_open_context *ctx;
ctx = nfs_file_open_context(filp);
if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags) ||
nfs_ctx_key_to_expire(ctx, inode))
if (nfs_ctx_key_to_expire(ctx, inode))
return 1;
return 0;
}

6
fs/nfs/internal.h
View File

@ -773,9 +773,3 @@ static inline bool nfs_error_is_fatal(int err)
}
}
static inline void nfs_context_set_write_error(struct nfs_open_context *ctx, int error)
{
ctx->error = error;
smp_wmb();
set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
}

40
fs/nfs/write.c
View File

@ -244,6 +244,12 @@ static void nfs_set_pageerror(struct address_space *mapping)
nfs_zap_mapping(mapping->host, mapping);
}
static void nfs_mapping_set_error(struct page *page, int error)
{
SetPageError(page);
mapping_set_error(page_file_mapping(page), error);
}
/*
* nfs_page_group_search_locked
* @head - head request of page group
@ -582,9 +588,9 @@ nfs_lock_and_join_requests(struct page *page)
return ERR_PTR(ret);
}
static void nfs_write_error_remove_page(struct nfs_page *req)
static void nfs_write_error(struct nfs_page *req, int error)
{
SetPageError(req->wb_page);
nfs_mapping_set_error(req->wb_page, error);
nfs_end_page_writeback(req);
nfs_release_request(req);
}
@ -608,6 +614,7 @@ nfs_error_is_fatal_on_server(int err)
static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,
struct page *page)
{
struct address_space *mapping;
struct nfs_page *req;
int ret = 0;
@ -621,19 +628,19 @@ static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,
nfs_set_page_writeback(page);
WARN_ON_ONCE(test_bit(PG_CLEAN, &req->wb_flags));
ret = req->wb_context->error;
/* If there is a fatal error that covers this write, just exit */
if (nfs_error_is_fatal_on_server(ret))
ret = 0;
mapping = page_file_mapping(page);
if (test_bit(AS_ENOSPC, &mapping->flags) ||
test_bit(AS_EIO, &mapping->flags))
goto out_launder;
ret = 0;
if (!nfs_pageio_add_request(pgio, req)) {
ret = pgio->pg_error;
/*
* Remove the problematic req upon fatal errors on the server
*/
if (nfs_error_is_fatal(ret)) {
nfs_context_set_write_error(req->wb_context, ret);
if (nfs_error_is_fatal_on_server(ret))
goto out_launder;
} else
@ -645,7 +652,7 @@ static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,
out:
return ret;
out_launder:
nfs_write_error_remove_page(req);
nfs_write_error(req, ret);
return 0;
}
@ -998,7 +1005,7 @@ static void nfs_write_completion(struct nfs_pgio_header *hdr)
if (test_bit(NFS_IOHDR_ERROR, &hdr->flags) &&
(hdr->good_bytes < bytes)) {
nfs_set_pageerror(page_file_mapping(req->wb_page));
nfs_context_set_write_error(req->wb_context, hdr->error);
nfs_mapping_set_error(req->wb_page, hdr->error);
goto remove_req;
}
if (nfs_write_need_commit(hdr)) {
@ -1422,14 +1429,10 @@ static void nfs_async_write_error(struct list_head *head, int error)
while (!list_empty(head)) {
req = nfs_list_entry(head->next);
nfs_list_remove_request(req);
if (nfs_error_is_fatal(error)) {
nfs_context_set_write_error(req->wb_context, error);
if (nfs_error_is_fatal_on_server(error)) {
nfs_write_error_remove_page(req);
continue;
}
}
nfs_redirty_request(req);
if (nfs_error_is_fatal(error))
nfs_write_error(req, error);
else
nfs_redirty_request(req);
}
}
@ -1843,9 +1846,10 @@ static void nfs_commit_release_pages(struct nfs_commit_data *data)
req->wb_bytes,
(long long)req_offset(req));
if (status < 0) {
nfs_context_set_write_error(req->wb_context, status);
if (req->wb_page)
if (req->wb_page) {
nfs_mapping_set_error(req->wb_page, status);
nfs_inode_remove_request(req);
}
dprintk_cont(", error = %d\n", status);
goto next;
}

1
include/linux/nfs_fs.h
View File

@ -76,7 +76,6 @@ struct nfs_open_context {
fmode_t mode;
unsigned long flags;
#define NFS_CONTEXT_ERROR_WRITE (0)
#define NFS_CONTEXT_RESEND_WRITES (1)
#define NFS_CONTEXT_BAD (2)
#define NFS_CONTEXT_UNLOCK (3)