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ext4: return to starting transaction in ext4_dax_huge_fault()
[sfrench/cifs-2.6.git]
/
fs
/
ext4
/
file.c
diff --git
a/fs/ext4/file.c
b/fs/ext4/file.c
index cefa9835f275d9b062ae9b13765ea743edb53f64..831fd6beebf01bfa65c1c4a3ae505ed84bd35526 100644
(file)
--- a/
fs/ext4/file.c
+++ b/
fs/ext4/file.c
@@
-257,6
+257,7
@@
static int ext4_dax_huge_fault(struct vm_fault *vmf,
enum page_entry_size pe_size)
{
int result;
enum page_entry_size pe_size)
{
int result;
+ handle_t *handle = NULL;
struct inode *inode = file_inode(vmf->vma->vm_file);
struct super_block *sb = inode->i_sb;
bool write = vmf->flags & FAULT_FLAG_WRITE;
struct inode *inode = file_inode(vmf->vma->vm_file);
struct super_block *sb = inode->i_sb;
bool write = vmf->flags & FAULT_FLAG_WRITE;
@@
-264,12
+265,24
@@
static int ext4_dax_huge_fault(struct vm_fault *vmf,
if (write) {
sb_start_pagefault(sb);
file_update_time(vmf->vma->vm_file);
if (write) {
sb_start_pagefault(sb);
file_update_time(vmf->vma->vm_file);
+ down_read(&EXT4_I(inode)->i_mmap_sem);
+ handle = ext4_journal_start_sb(sb, EXT4_HT_WRITE_PAGE,
+ EXT4_DATA_TRANS_BLOCKS(sb));
+ } else {
+ down_read(&EXT4_I(inode)->i_mmap_sem);
}
}
- down_read(&EXT4_I(inode)->i_mmap_sem);
- result = dax_iomap_fault(vmf, pe_size, &ext4_iomap_ops);
- up_read(&EXT4_I(inode)->i_mmap_sem);
- if (write)
+ if (!IS_ERR(handle))
+ result = dax_iomap_fault(vmf, pe_size, &ext4_iomap_ops);
+ else
+ result = VM_FAULT_SIGBUS;
+ if (write) {
+ if (!IS_ERR(handle))
+ ext4_journal_stop(handle);
+ up_read(&EXT4_I(inode)->i_mmap_sem);
sb_end_pagefault(sb);
sb_end_pagefault(sb);
+ } else {
+ up_read(&EXT4_I(inode)->i_mmap_sem);
+ }
return result;
}
return result;
}