Commit a528a241 authored by Souptick Joarder's avatar Souptick Joarder Committed by David Sterba

btrfs: change return type of btrfs_page_mkwrite to vm_fault_t

Use the new return type vm_fault_t for fault handler. For now, this is
just documenting that the function returns a VM_FAULT value rather than
an errno. Once all instances are converted, vm_fault_t will become a
distinct type.

Reference commit 1c8f4220 ("mm: change return type to vm_fault_t")

vmf_error() is the newly introduced inline function in 4.17-rc6.
Signed-off-by: default avatarSouptick Joarder <jrdr.linux@gmail.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 9d311e11
......@@ -3197,7 +3197,7 @@ int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
size_t size, struct bio *bio,
unsigned long bio_flags);
void btrfs_set_range_writeback(void *private_data, u64 start, u64 end);
int btrfs_page_mkwrite(struct vm_fault *vmf);
vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf);
int btrfs_readpage(struct file *file, struct page *page);
void btrfs_evict_inode(struct inode *inode);
int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
......
......@@ -8872,7 +8872,7 @@ static void btrfs_invalidatepage(struct page *page, unsigned int offset,
* beyond EOF, then the page is guaranteed safe against truncation until we
* unlock the page.
*/
int btrfs_page_mkwrite(struct vm_fault *vmf)
vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf)
{
struct page *page = vmf->page;
struct inode *inode = file_inode(vmf->vma->vm_file);
......@@ -8884,7 +8884,8 @@ int btrfs_page_mkwrite(struct vm_fault *vmf)
char *kaddr;
unsigned long zero_start;
loff_t size;
int ret;
vm_fault_t ret;
int ret2;
int reserved = 0;
u64 reserved_space;
u64 page_start;
......@@ -8906,17 +8907,14 @@ int btrfs_page_mkwrite(struct vm_fault *vmf)
* end up waiting indefinitely to get a lock on the page currently
* being processed by btrfs_page_mkwrite() function.
*/
ret = btrfs_delalloc_reserve_space(inode, &data_reserved, page_start,
ret2 = btrfs_delalloc_reserve_space(inode, &data_reserved, page_start,
reserved_space);
if (!ret) {
ret = file_update_time(vmf->vma->vm_file);
if (!ret2) {
ret2 = file_update_time(vmf->vma->vm_file);
reserved = 1;
}
if (ret) {
if (ret == -ENOMEM)
ret = VM_FAULT_OOM;
else /* -ENOSPC, -EIO, etc */
ret = VM_FAULT_SIGBUS;
if (ret2) {
ret = vmf_error(ret2);
if (reserved)
goto out;
goto out_noreserve;
......@@ -8975,15 +8973,15 @@ int btrfs_page_mkwrite(struct vm_fault *vmf)
EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG,
0, 0, &cached_state);
ret = btrfs_set_extent_delalloc(inode, page_start, end, 0,
ret2 = btrfs_set_extent_delalloc(inode, page_start, end, 0,
&cached_state, 0);
if (ret) {
if (ret2) {
unlock_extent_cached(io_tree, page_start, page_end,
&cached_state);
ret = VM_FAULT_SIGBUS;
goto out_unlock;
}
ret = 0;
ret2 = 0;
/* page is wholly or partially inside EOF */
if (page_start + PAGE_SIZE > size)
......@@ -9008,7 +9006,7 @@ int btrfs_page_mkwrite(struct vm_fault *vmf)
unlock_extent_cached(io_tree, page_start, page_end, &cached_state);
out_unlock:
if (!ret) {
if (!ret2) {
btrfs_delalloc_release_extents(BTRFS_I(inode), PAGE_SIZE, true);
sb_end_pagefault(inode->i_sb);
extent_changeset_free(data_reserved);
......
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