Ything-RepoMirrors/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-01-24 23:16:46 +00:00
Code Issues Packages Projects Releases Wiki Activity

mm/filemap: introduce generic_file_*_mmap_prepare() helpers

Browse Source 
Since commit c84bf6dd2b ("mm: introduce new .mmap_prepare() file
callback"), the f_op->mmap() hook has been deprecated in favour of
f_op->mmap_prepare().

The generic mmap handlers are very simple, so we can very easily convert
these in advance of converting file systems which use them.

This patch does so.

Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Link: https://lore.kernel.org/30622c1f0b98c66840bc8c02668bda276a810b70.1750099179.git.lorenzo.stoakes@oracle.com
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Lorenzo Stoakes
2025-06-16 20:33:26 +01:00
committed by Christian Brauner
parent 6528d29b46
commit 5b44297bcf
2 changed files with 33 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
include/linux/fs.h
View File

@@ -3393,8 +3393,10 @@ extern void inode_add_lru(struct inode *inode);
extern int sb_set_blocksize(struct super_block *, int);
extern int sb_min_blocksize(struct super_block *, int);
extern int generic_file_mmap(struct file *, struct vm_area_struct *);
extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
int generic_file_mmap(struct file *, struct vm_area_struct *);
int generic_file_mmap_prepare(struct vm_area_desc *desc);
int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
int generic_file_readonly_mmap_prepare(struct vm_area_desc *desc);
extern ssize_t generic_write_checks(struct kiocb *, struct iov_iter *);
int generic_write_checks_count(struct kiocb *iocb, loff_t *count);
extern int generic_write_check_limits(struct file *file, loff_t pos,

29
mm/filemap.c
View File

@@ -3814,6 +3814,18 @@ int generic_file_mmap(struct file *file, struct vm_area_struct *vma)
return 0;
}
int generic_file_mmap_prepare(struct vm_area_desc *desc)
{
struct file *file = desc->file;
struct address_space *mapping = file->f_mapping;
if (!mapping->a_ops->read_folio)
return -ENOEXEC;
file_accessed(file);
desc->vm_ops = &generic_file_vm_ops;
return 0;
}
/*
* This is for filesystems which do not implement ->writepage.
*/
@@ -3823,6 +3835,13 @@ int generic_file_readonly_mmap(struct file *file, struct vm_area_struct *vma)
return -EINVAL;
return generic_file_mmap(file, vma);
}
int generic_file_readonly_mmap_prepare(struct vm_area_desc *desc)
{
if (is_shared_maywrite(desc->vm_flags))
return -EINVAL;
return generic_file_mmap_prepare(desc);
}
#else
vm_fault_t filemap_page_mkwrite(struct vm_fault *vmf)
{
@@ -3832,15 +3851,25 @@ int generic_file_mmap(struct file *file, struct vm_area_struct *vma)
{
return -ENOSYS;
}
int generic_file_mmap_prepare(struct vm_area_desc *desc)
{
return -ENOSYS;
}
int generic_file_readonly_mmap(struct file *file, struct vm_area_struct *vma)
{
return -ENOSYS;
}
int generic_file_readonly_mmap_prepare(struct vm_area_desc *desc)
{
return -ENOSYS;
}
#endif /* CONFIG_MMU */
EXPORT_SYMBOL(filemap_page_mkwrite);
EXPORT_SYMBOL(generic_file_mmap);
EXPORT_SYMBOL(generic_file_mmap_prepare);
EXPORT_SYMBOL(generic_file_readonly_mmap);
EXPORT_SYMBOL(generic_file_readonly_mmap_prepare);
static struct folio *do_read_cache_folio(struct address_space *mapping,
pgoff_t index, filler_t filler, struct file *file, gfp_t gfp)