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Merge branch 'xfs-mmap-lock' into for-next

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This commit is contained in:
Dave Chinner
2015-02-24 10:27:47 +11:00
parent 4225441a1e 723cac4847
commit 88e8fda99a
8 changed files with 216 additions and 113 deletions
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70
fs/xfs/xfs_file.c
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@@ -847,6 +847,9 @@ xfs_file_fallocate(
if (error)
goto out_unlock;
xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
iolock |= XFS_MMAPLOCK_EXCL;
if (mode & FALLOC_FL_PUNCH_HOLE) {
error = xfs_free_file_space(ip, offset, len);
if (error)
@@ -996,20 +999,6 @@ xfs_file_mmap(
return 0;
}
/*
* mmap()d file has taken write protection fault and is being made
* writable. We can set the page state up correctly for a writable
* page, which means we can do correct delalloc accounting (ENOSPC
* checking!) and unwritten extent mapping.
*/
STATIC int
xfs_vm_page_mkwrite(
struct vm_area_struct *vma,
struct vm_fault *vmf)
{
return block_page_mkwrite(vma, vmf, xfs_get_blocks);
}
/*
* This type is designed to indicate the type of offset we would like
* to search from page cache for xfs_seek_hole_data().
@@ -1385,6 +1374,55 @@ xfs_file_llseek(
}
}
/*
* Locking for serialisation of IO during page faults. This results in a lock
* ordering of:
*
* mmap_sem (MM)
* i_mmap_lock (XFS - truncate serialisation)
* page_lock (MM)
* i_lock (XFS - extent map serialisation)
*/
STATIC int
xfs_filemap_fault(
struct vm_area_struct *vma,
struct vm_fault *vmf)
{
struct xfs_inode *ip = XFS_I(vma->vm_file->f_mapping->host);
int error;
trace_xfs_filemap_fault(ip);
xfs_ilock(ip, XFS_MMAPLOCK_SHARED);
error = filemap_fault(vma, vmf);
xfs_iunlock(ip, XFS_MMAPLOCK_SHARED);
return error;
}
/*
* mmap()d file has taken write protection fault and is being made writable. We
* can set the page state up correctly for a writable page, which means we can
* do correct delalloc accounting (ENOSPC checking!) and unwritten extent
* mapping.
*/
STATIC int
xfs_filemap_page_mkwrite(
struct vm_area_struct *vma,
struct vm_fault *vmf)
{
struct xfs_inode *ip = XFS_I(vma->vm_file->f_mapping->host);
int error;
trace_xfs_filemap_page_mkwrite(ip);
xfs_ilock(ip, XFS_MMAPLOCK_SHARED);
error = block_page_mkwrite(vma, vmf, xfs_get_blocks);
xfs_iunlock(ip, XFS_MMAPLOCK_SHARED);
return error;
}
const struct file_operations xfs_file_operations = {
.llseek = xfs_file_llseek,
.read = new_sync_read,
@@ -1417,7 +1455,7 @@ const struct file_operations xfs_dir_file_operations = {
};
static const struct vm_operations_struct xfs_file_vm_ops = {
.fault = filemap_fault,
.fault = xfs_filemap_fault,
.map_pages = filemap_map_pages,
.page_mkwrite = xfs_vm_page_mkwrite,
.page_mkwrite = xfs_filemap_page_mkwrite,
};