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NFS: Fix up fsync() when the server rebooted 

Don't clear the NFS_CONTEXT_RESEND_WRITES flag until after calling
nfs_commit_inode(). Otherwise, if nfs_commit_inode() returns an
error, we end up with dirty pages in the page cache, but no tag
to tell us that those pages need resending.

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 2020-01-06 15:25:03 -05:00 committed by Anna Schumaker
parent b32d285539
commit 2197e9b06c
1 changed files with 16 additions and 21 deletions
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33
fs/nfs/file.c
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@ -204,44 +204,39 @@ EXPORT_SYMBOL_GPL(nfs_file_mmap);
static int
nfs_file_fsync_commit(struct file *file, int datasync)
{
struct nfs_open_context *ctx = nfs_file_open_context(file);
struct inode *inode = file_inode(file);
int do_resend, status;
int ret = 0;
int ret;
dprintk("NFS: fsync file(%pD2) datasync %d\n", file, 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 (status == 0)
status = file_check_and_advance_wb_err(file);
if (status < 0) {
ret = status;
goto out;
}
do_resend |= test_bit(NFS_CONTEXT_RESEND_WRITES, &ctx->flags);
if (do_resend)
ret = -EAGAIN;
out:
ret = nfs_commit_inode(inode, FLUSH_SYNC);
if (ret < 0)
return ret;
return file_check_and_advance_wb_err(file);
}
int
nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
{
int ret;
struct nfs_open_context *ctx = nfs_file_open_context(file);
struct inode *inode = file_inode(file);
int ret;
trace_nfs_fsync_enter(inode);
do {
for (;;) {
ret = file_write_and_wait_range(file, start, end);
if (ret != 0)
break;
ret = nfs_file_fsync_commit(file, datasync);
if (!ret)
if (ret != 0)
break;
ret = pnfs_sync_inode(inode, !!datasync);
if (ret != 0)
break;
if (!test_and_clear_bit(NFS_CONTEXT_RESEND_WRITES, &ctx->flags))
break;
/*
* If nfs_file_fsync_commit detected a server reboot, then
* resend all dirty pages that might have been covered by
@ -249,7 +244,7 @@ nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
*/
start = 0;
end = LLONG_MAX;
} while (ret == -EAGAIN);
}
trace_nfs_fsync_exit(inode, ret);
return ret;