* [PATCH] fs: clean up usage of noop_dirty_folio
@ 2023-08-19 12:42 Xueshi Hu
2023-08-21 11:16 ` Jan Kara
0 siblings, 1 reply; 4+ messages in thread
From: Xueshi Hu @ 2023-08-19 12:42 UTC (permalink / raw)
To: dan.j.williams, vishal.l.verma, dave.jiang, jayalk, daniel,
deller, bcrl, viro, brauner, jack, tytso, adilger.kernel, miklos,
mike.kravetz, muchun.song, djwong, willy, akpm, hughd
Cc: nvdimm, linux-cxl, linux-kernel, linux-fbdev, dri-devel,
linux-aio, linux-fsdevel, linux-ext4, linux-mm, linux-xfs,
Xueshi Hu
In folio_mark_dirty(), it will automatically fallback to
noop_dirty_folio() if a_ops->dirty_folio is not registered.
As anon_aops, dev_dax_aops and fb_deferred_io_aops becames empty, remove
them too.
Signed-off-by: Xueshi Hu <xueshi.hu@smartx.com>
---
drivers/dax/device.c | 5 -----
drivers/video/fbdev/core/fb_defio.c | 5 -----
fs/aio.c | 1 -
fs/ext2/inode.c | 1 -
fs/ext4/inode.c | 1 -
fs/fuse/dax.c | 1 -
fs/hugetlbfs/inode.c | 1 -
fs/libfs.c | 5 -----
fs/xfs/xfs_aops.c | 1 -
include/linux/pagemap.h | 1 -
mm/page-writeback.c | 6 +++---
mm/secretmem.c | 1 -
mm/shmem.c | 1 -
mm/swap_state.c | 1 -
14 files changed, 3 insertions(+), 28 deletions(-)
diff --git a/drivers/dax/device.c b/drivers/dax/device.c
index 30665a3ff6ea..018aa9f88ec7 100644
--- a/drivers/dax/device.c
+++ b/drivers/dax/device.c
@@ -345,10 +345,6 @@ static unsigned long dax_get_unmapped_area(struct file *filp,
return current->mm->get_unmapped_area(filp, addr, len, pgoff, flags);
}
-static const struct address_space_operations dev_dax_aops = {
- .dirty_folio = noop_dirty_folio,
-};
-
static int dax_open(struct inode *inode, struct file *filp)
{
struct dax_device *dax_dev = inode_dax(inode);
@@ -358,7 +354,6 @@ static int dax_open(struct inode *inode, struct file *filp)
dev_dbg(&dev_dax->dev, "trace\n");
inode->i_mapping = __dax_inode->i_mapping;
inode->i_mapping->host = __dax_inode;
- inode->i_mapping->a_ops = &dev_dax_aops;
filp->f_mapping = inode->i_mapping;
filp->f_wb_err = filemap_sample_wb_err(filp->f_mapping);
filp->f_sb_err = file_sample_sb_err(filp);
diff --git a/drivers/video/fbdev/core/fb_defio.c b/drivers/video/fbdev/core/fb_defio.c
index 274f5d0fa247..08be3592281f 100644
--- a/drivers/video/fbdev/core/fb_defio.c
+++ b/drivers/video/fbdev/core/fb_defio.c
@@ -221,10 +221,6 @@ static const struct vm_operations_struct fb_deferred_io_vm_ops = {
.page_mkwrite = fb_deferred_io_mkwrite,
};
-static const struct address_space_operations fb_deferred_io_aops = {
- .dirty_folio = noop_dirty_folio,
-};
-
int fb_deferred_io_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
vma->vm_ops = &fb_deferred_io_vm_ops;
@@ -307,7 +303,6 @@ void fb_deferred_io_open(struct fb_info *info,
{
struct fb_deferred_io *fbdefio = info->fbdefio;
- file->f_mapping->a_ops = &fb_deferred_io_aops;
fbdefio->open_count++;
}
EXPORT_SYMBOL_GPL(fb_deferred_io_open);
diff --git a/fs/aio.c b/fs/aio.c
index 77e33619de40..4cf386f9cb1c 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -484,7 +484,6 @@ static int aio_migrate_folio(struct address_space *mapping, struct folio *dst,
#endif
static const struct address_space_operations aio_ctx_aops = {
- .dirty_folio = noop_dirty_folio,
.migrate_folio = aio_migrate_folio,
};
diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index 75983215c7a1..ce191bdf1c78 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -971,7 +971,6 @@ const struct address_space_operations ext2_aops = {
static const struct address_space_operations ext2_dax_aops = {
.writepages = ext2_dax_writepages,
.direct_IO = noop_direct_IO,
- .dirty_folio = noop_dirty_folio,
};
/*
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 43775a6ca505..67c1710c01b0 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3561,7 +3561,6 @@ static const struct address_space_operations ext4_da_aops = {
static const struct address_space_operations ext4_dax_aops = {
.writepages = ext4_dax_writepages,
.direct_IO = noop_direct_IO,
- .dirty_folio = noop_dirty_folio,
.bmap = ext4_bmap,
.swap_activate = ext4_iomap_swap_activate,
};
diff --git a/fs/fuse/dax.c b/fs/fuse/dax.c
index 8e74f278a3f6..50ca767cbd5e 100644
--- a/fs/fuse/dax.c
+++ b/fs/fuse/dax.c
@@ -1326,7 +1326,6 @@ bool fuse_dax_inode_alloc(struct super_block *sb, struct fuse_inode *fi)
static const struct address_space_operations fuse_dax_file_aops = {
.writepages = fuse_dax_writepages,
.direct_IO = noop_direct_IO,
- .dirty_folio = noop_dirty_folio,
};
static bool fuse_should_enable_dax(struct inode *inode, unsigned int flags)
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 7b17ccfa039d..5404286f0c13 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -1266,7 +1266,6 @@ static void hugetlbfs_destroy_inode(struct inode *inode)
static const struct address_space_operations hugetlbfs_aops = {
.write_begin = hugetlbfs_write_begin,
.write_end = hugetlbfs_write_end,
- .dirty_folio = noop_dirty_folio,
.migrate_folio = hugetlbfs_migrate_folio,
.error_remove_page = hugetlbfs_error_remove_page,
};
diff --git a/fs/libfs.c b/fs/libfs.c
index 5b851315eeed..982f220a9ee3 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -627,7 +627,6 @@ const struct address_space_operations ram_aops = {
.read_folio = simple_read_folio,
.write_begin = simple_write_begin,
.write_end = simple_write_end,
- .dirty_folio = noop_dirty_folio,
};
EXPORT_SYMBOL(ram_aops);
@@ -1231,16 +1230,12 @@ EXPORT_SYMBOL(kfree_link);
struct inode *alloc_anon_inode(struct super_block *s)
{
- static const struct address_space_operations anon_aops = {
- .dirty_folio = noop_dirty_folio,
- };
struct inode *inode = new_inode_pseudo(s);
if (!inode)
return ERR_PTR(-ENOMEM);
inode->i_ino = get_next_ino();
- inode->i_mapping->a_ops = &anon_aops;
/*
* Mark the inode dirty from the very beginning,
diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index 451942fb38ec..300acea9ee63 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -590,6 +590,5 @@ const struct address_space_operations xfs_address_space_operations = {
const struct address_space_operations xfs_dax_aops = {
.writepages = xfs_dax_writepages,
- .dirty_folio = noop_dirty_folio,
.swap_activate = xfs_iomap_swapfile_activate,
};
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 716953ee1ebd..9de3be51dee2 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -1074,7 +1074,6 @@ bool folio_clear_dirty_for_io(struct folio *folio);
bool clear_page_dirty_for_io(struct page *page);
void folio_invalidate(struct folio *folio, size_t offset, size_t length);
int __set_page_dirty_nobuffers(struct page *page);
-bool noop_dirty_folio(struct address_space *mapping, struct folio *folio);
#ifdef CONFIG_MIGRATION
int filemap_migrate_folio(struct address_space *mapping, struct folio *dst,
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index d3f42009bb70..638ec965cf0b 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2588,13 +2588,12 @@ int do_writepages(struct address_space *mapping, struct writeback_control *wbc)
/*
* For address_spaces which do not use buffers nor write back.
*/
-bool noop_dirty_folio(struct address_space *mapping, struct folio *folio)
+static bool noop_dirty_folio(struct address_space *mapping, struct folio *folio)
{
if (!folio_test_dirty(folio))
return !folio_test_set_dirty(folio);
return false;
}
-EXPORT_SYMBOL(noop_dirty_folio);
/*
* Helper function for set_page_dirty family.
@@ -2799,7 +2798,8 @@ bool folio_mark_dirty(struct folio *folio)
*/
if (folio_test_reclaim(folio))
folio_clear_reclaim(folio);
- return mapping->a_ops->dirty_folio(mapping, folio);
+ if (mapping->a_ops->dirty_folio)
+ return mapping->a_ops->dirty_folio(mapping, folio);
}
return noop_dirty_folio(mapping, folio);
diff --git a/mm/secretmem.c b/mm/secretmem.c
index 86442a15d12f..3fe1c35f9c8d 100644
--- a/mm/secretmem.c
+++ b/mm/secretmem.c
@@ -157,7 +157,6 @@ static void secretmem_free_folio(struct folio *folio)
}
const struct address_space_operations secretmem_aops = {
- .dirty_folio = noop_dirty_folio,
.free_folio = secretmem_free_folio,
.migrate_folio = secretmem_migrate_folio,
};
diff --git a/mm/shmem.c b/mm/shmem.c
index f5af4b943e42..90a7c046894a 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -4088,7 +4088,6 @@ static int shmem_error_remove_page(struct address_space *mapping,
const struct address_space_operations shmem_aops = {
.writepage = shmem_writepage,
- .dirty_folio = noop_dirty_folio,
#ifdef CONFIG_TMPFS
.write_begin = shmem_write_begin,
.write_end = shmem_write_end,
diff --git a/mm/swap_state.c b/mm/swap_state.c
index f8ea7015bad4..3666439487db 100644
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -30,7 +30,6 @@
*/
static const struct address_space_operations swap_aops = {
.writepage = swap_writepage,
- .dirty_folio = noop_dirty_folio,
#ifdef CONFIG_MIGRATION
.migrate_folio = migrate_folio,
#endif
--
2.40.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] fs: clean up usage of noop_dirty_folio
2023-08-19 12:42 [PATCH] fs: clean up usage of noop_dirty_folio Xueshi Hu
@ 2023-08-21 11:16 ` Jan Kara
2023-08-21 12:20 ` Matthew Wilcox
0 siblings, 1 reply; 4+ messages in thread
From: Jan Kara @ 2023-08-21 11:16 UTC (permalink / raw)
To: Xueshi Hu
Cc: dan.j.williams, vishal.l.verma, dave.jiang, jayalk, daniel,
deller, bcrl, viro, brauner, jack, tytso, adilger.kernel, miklos,
mike.kravetz, muchun.song, djwong, willy, akpm, hughd, nvdimm,
linux-cxl, linux-kernel, linux-fbdev, dri-devel, linux-aio,
linux-fsdevel, linux-ext4, linux-mm, linux-xfs
On Sat 19-08-23 20:42:25, Xueshi Hu wrote:
> In folio_mark_dirty(), it will automatically fallback to
> noop_dirty_folio() if a_ops->dirty_folio is not registered.
>
> As anon_aops, dev_dax_aops and fb_deferred_io_aops becames empty, remove
> them too.
>
> Signed-off-by: Xueshi Hu <xueshi.hu@smartx.com>
Yeah, looks sensible to me but for some callbacks we are oscilating between
all users having to provide some callback and providing some default
behavior for NULL callback. I don't have a strong opinion either way so
feel free to add:
Reviewed-by: Jan Kara <jack@suse.cz>
But I guess let's see what Matthew thinks about this and what plans he has
so that we don't switch back again in the near future. Matthew?
Honza
> ---
> drivers/dax/device.c | 5 -----
> drivers/video/fbdev/core/fb_defio.c | 5 -----
> fs/aio.c | 1 -
> fs/ext2/inode.c | 1 -
> fs/ext4/inode.c | 1 -
> fs/fuse/dax.c | 1 -
> fs/hugetlbfs/inode.c | 1 -
> fs/libfs.c | 5 -----
> fs/xfs/xfs_aops.c | 1 -
> include/linux/pagemap.h | 1 -
> mm/page-writeback.c | 6 +++---
> mm/secretmem.c | 1 -
> mm/shmem.c | 1 -
> mm/swap_state.c | 1 -
> 14 files changed, 3 insertions(+), 28 deletions(-)
>
> diff --git a/drivers/dax/device.c b/drivers/dax/device.c
> index 30665a3ff6ea..018aa9f88ec7 100644
> --- a/drivers/dax/device.c
> +++ b/drivers/dax/device.c
> @@ -345,10 +345,6 @@ static unsigned long dax_get_unmapped_area(struct file *filp,
> return current->mm->get_unmapped_area(filp, addr, len, pgoff, flags);
> }
>
> -static const struct address_space_operations dev_dax_aops = {
> - .dirty_folio = noop_dirty_folio,
> -};
> -
> static int dax_open(struct inode *inode, struct file *filp)
> {
> struct dax_device *dax_dev = inode_dax(inode);
> @@ -358,7 +354,6 @@ static int dax_open(struct inode *inode, struct file *filp)
> dev_dbg(&dev_dax->dev, "trace\n");
> inode->i_mapping = __dax_inode->i_mapping;
> inode->i_mapping->host = __dax_inode;
> - inode->i_mapping->a_ops = &dev_dax_aops;
> filp->f_mapping = inode->i_mapping;
> filp->f_wb_err = filemap_sample_wb_err(filp->f_mapping);
> filp->f_sb_err = file_sample_sb_err(filp);
> diff --git a/drivers/video/fbdev/core/fb_defio.c b/drivers/video/fbdev/core/fb_defio.c
> index 274f5d0fa247..08be3592281f 100644
> --- a/drivers/video/fbdev/core/fb_defio.c
> +++ b/drivers/video/fbdev/core/fb_defio.c
> @@ -221,10 +221,6 @@ static const struct vm_operations_struct fb_deferred_io_vm_ops = {
> .page_mkwrite = fb_deferred_io_mkwrite,
> };
>
> -static const struct address_space_operations fb_deferred_io_aops = {
> - .dirty_folio = noop_dirty_folio,
> -};
> -
> int fb_deferred_io_mmap(struct fb_info *info, struct vm_area_struct *vma)
> {
> vma->vm_ops = &fb_deferred_io_vm_ops;
> @@ -307,7 +303,6 @@ void fb_deferred_io_open(struct fb_info *info,
> {
> struct fb_deferred_io *fbdefio = info->fbdefio;
>
> - file->f_mapping->a_ops = &fb_deferred_io_aops;
> fbdefio->open_count++;
> }
> EXPORT_SYMBOL_GPL(fb_deferred_io_open);
> diff --git a/fs/aio.c b/fs/aio.c
> index 77e33619de40..4cf386f9cb1c 100644
> --- a/fs/aio.c
> +++ b/fs/aio.c
> @@ -484,7 +484,6 @@ static int aio_migrate_folio(struct address_space *mapping, struct folio *dst,
> #endif
>
> static const struct address_space_operations aio_ctx_aops = {
> - .dirty_folio = noop_dirty_folio,
> .migrate_folio = aio_migrate_folio,
> };
>
> diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
> index 75983215c7a1..ce191bdf1c78 100644
> --- a/fs/ext2/inode.c
> +++ b/fs/ext2/inode.c
> @@ -971,7 +971,6 @@ const struct address_space_operations ext2_aops = {
> static const struct address_space_operations ext2_dax_aops = {
> .writepages = ext2_dax_writepages,
> .direct_IO = noop_direct_IO,
> - .dirty_folio = noop_dirty_folio,
> };
>
> /*
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index 43775a6ca505..67c1710c01b0 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -3561,7 +3561,6 @@ static const struct address_space_operations ext4_da_aops = {
> static const struct address_space_operations ext4_dax_aops = {
> .writepages = ext4_dax_writepages,
> .direct_IO = noop_direct_IO,
> - .dirty_folio = noop_dirty_folio,
> .bmap = ext4_bmap,
> .swap_activate = ext4_iomap_swap_activate,
> };
> diff --git a/fs/fuse/dax.c b/fs/fuse/dax.c
> index 8e74f278a3f6..50ca767cbd5e 100644
> --- a/fs/fuse/dax.c
> +++ b/fs/fuse/dax.c
> @@ -1326,7 +1326,6 @@ bool fuse_dax_inode_alloc(struct super_block *sb, struct fuse_inode *fi)
> static const struct address_space_operations fuse_dax_file_aops = {
> .writepages = fuse_dax_writepages,
> .direct_IO = noop_direct_IO,
> - .dirty_folio = noop_dirty_folio,
> };
>
> static bool fuse_should_enable_dax(struct inode *inode, unsigned int flags)
> diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
> index 7b17ccfa039d..5404286f0c13 100644
> --- a/fs/hugetlbfs/inode.c
> +++ b/fs/hugetlbfs/inode.c
> @@ -1266,7 +1266,6 @@ static void hugetlbfs_destroy_inode(struct inode *inode)
> static const struct address_space_operations hugetlbfs_aops = {
> .write_begin = hugetlbfs_write_begin,
> .write_end = hugetlbfs_write_end,
> - .dirty_folio = noop_dirty_folio,
> .migrate_folio = hugetlbfs_migrate_folio,
> .error_remove_page = hugetlbfs_error_remove_page,
> };
> diff --git a/fs/libfs.c b/fs/libfs.c
> index 5b851315eeed..982f220a9ee3 100644
> --- a/fs/libfs.c
> +++ b/fs/libfs.c
> @@ -627,7 +627,6 @@ const struct address_space_operations ram_aops = {
> .read_folio = simple_read_folio,
> .write_begin = simple_write_begin,
> .write_end = simple_write_end,
> - .dirty_folio = noop_dirty_folio,
> };
> EXPORT_SYMBOL(ram_aops);
>
> @@ -1231,16 +1230,12 @@ EXPORT_SYMBOL(kfree_link);
>
> struct inode *alloc_anon_inode(struct super_block *s)
> {
> - static const struct address_space_operations anon_aops = {
> - .dirty_folio = noop_dirty_folio,
> - };
> struct inode *inode = new_inode_pseudo(s);
>
> if (!inode)
> return ERR_PTR(-ENOMEM);
>
> inode->i_ino = get_next_ino();
> - inode->i_mapping->a_ops = &anon_aops;
>
> /*
> * Mark the inode dirty from the very beginning,
> diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
> index 451942fb38ec..300acea9ee63 100644
> --- a/fs/xfs/xfs_aops.c
> +++ b/fs/xfs/xfs_aops.c
> @@ -590,6 +590,5 @@ const struct address_space_operations xfs_address_space_operations = {
>
> const struct address_space_operations xfs_dax_aops = {
> .writepages = xfs_dax_writepages,
> - .dirty_folio = noop_dirty_folio,
> .swap_activate = xfs_iomap_swapfile_activate,
> };
> diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
> index 716953ee1ebd..9de3be51dee2 100644
> --- a/include/linux/pagemap.h
> +++ b/include/linux/pagemap.h
> @@ -1074,7 +1074,6 @@ bool folio_clear_dirty_for_io(struct folio *folio);
> bool clear_page_dirty_for_io(struct page *page);
> void folio_invalidate(struct folio *folio, size_t offset, size_t length);
> int __set_page_dirty_nobuffers(struct page *page);
> -bool noop_dirty_folio(struct address_space *mapping, struct folio *folio);
>
> #ifdef CONFIG_MIGRATION
> int filemap_migrate_folio(struct address_space *mapping, struct folio *dst,
> diff --git a/mm/page-writeback.c b/mm/page-writeback.c
> index d3f42009bb70..638ec965cf0b 100644
> --- a/mm/page-writeback.c
> +++ b/mm/page-writeback.c
> @@ -2588,13 +2588,12 @@ int do_writepages(struct address_space *mapping, struct writeback_control *wbc)
> /*
> * For address_spaces which do not use buffers nor write back.
> */
> -bool noop_dirty_folio(struct address_space *mapping, struct folio *folio)
> +static bool noop_dirty_folio(struct address_space *mapping, struct folio *folio)
> {
> if (!folio_test_dirty(folio))
> return !folio_test_set_dirty(folio);
> return false;
> }
> -EXPORT_SYMBOL(noop_dirty_folio);
>
> /*
> * Helper function for set_page_dirty family.
> @@ -2799,7 +2798,8 @@ bool folio_mark_dirty(struct folio *folio)
> */
> if (folio_test_reclaim(folio))
> folio_clear_reclaim(folio);
> - return mapping->a_ops->dirty_folio(mapping, folio);
> + if (mapping->a_ops->dirty_folio)
> + return mapping->a_ops->dirty_folio(mapping, folio);
> }
>
> return noop_dirty_folio(mapping, folio);
> diff --git a/mm/secretmem.c b/mm/secretmem.c
> index 86442a15d12f..3fe1c35f9c8d 100644
> --- a/mm/secretmem.c
> +++ b/mm/secretmem.c
> @@ -157,7 +157,6 @@ static void secretmem_free_folio(struct folio *folio)
> }
>
> const struct address_space_operations secretmem_aops = {
> - .dirty_folio = noop_dirty_folio,
> .free_folio = secretmem_free_folio,
> .migrate_folio = secretmem_migrate_folio,
> };
> diff --git a/mm/shmem.c b/mm/shmem.c
> index f5af4b943e42..90a7c046894a 100644
> --- a/mm/shmem.c
> +++ b/mm/shmem.c
> @@ -4088,7 +4088,6 @@ static int shmem_error_remove_page(struct address_space *mapping,
>
> const struct address_space_operations shmem_aops = {
> .writepage = shmem_writepage,
> - .dirty_folio = noop_dirty_folio,
> #ifdef CONFIG_TMPFS
> .write_begin = shmem_write_begin,
> .write_end = shmem_write_end,
> diff --git a/mm/swap_state.c b/mm/swap_state.c
> index f8ea7015bad4..3666439487db 100644
> --- a/mm/swap_state.c
> +++ b/mm/swap_state.c
> @@ -30,7 +30,6 @@
> */
> static const struct address_space_operations swap_aops = {
> .writepage = swap_writepage,
> - .dirty_folio = noop_dirty_folio,
> #ifdef CONFIG_MIGRATION
> .migrate_folio = migrate_folio,
> #endif
> --
> 2.40.1
>
--
Jan Kara <jack@suse.com>
SUSE Labs, CR
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] fs: clean up usage of noop_dirty_folio
2023-08-21 11:16 ` Jan Kara
@ 2023-08-21 12:20 ` Matthew Wilcox
2023-08-28 6:36 ` Christoph Hellwig
0 siblings, 1 reply; 4+ messages in thread
From: Matthew Wilcox @ 2023-08-21 12:20 UTC (permalink / raw)
To: Jan Kara
Cc: Xueshi Hu, dan.j.williams, vishal.l.verma, dave.jiang, jayalk,
daniel, deller, bcrl, viro, brauner, jack, tytso, adilger.kernel,
miklos, mike.kravetz, muchun.song, djwong, akpm, hughd, nvdimm,
linux-cxl, linux-kernel, linux-fbdev, dri-devel, linux-aio,
linux-fsdevel, linux-ext4, linux-mm, linux-xfs
On Mon, Aug 21, 2023 at 01:16:43PM +0200, Jan Kara wrote:
> On Sat 19-08-23 20:42:25, Xueshi Hu wrote:
> > In folio_mark_dirty(), it will automatically fallback to
> > noop_dirty_folio() if a_ops->dirty_folio is not registered.
> >
> > As anon_aops, dev_dax_aops and fb_deferred_io_aops becames empty, remove
> > them too.
> >
> > Signed-off-by: Xueshi Hu <xueshi.hu@smartx.com>
>
> Yeah, looks sensible to me but for some callbacks we are oscilating between
> all users having to provide some callback and providing some default
> behavior for NULL callback. I don't have a strong opinion either way so
> feel free to add:
>
> Reviewed-by: Jan Kara <jack@suse.cz>
>
> But I guess let's see what Matthew thinks about this and what plans he has
> so that we don't switch back again in the near future. Matthew?
I was hoping Christoph would weigh in ;-) I don't have a strong
feeling here, but it seems to me that a NULL ->dirty_folio() should mean
"do the noop thing" rather than "do the buffer_head thing" or "do the
filemap thing". In 0af573780b0b, the buffer_head default was removed.
I think enough time has passed that we're OK to change what a NULL
->dirty_folio means (plus we also changed the name of ->set_page_dirty()
to ->dirty_folio())
So Ack to the concept. One minor change I'd request:
-bool noop_dirty_folio(struct address_space *mapping, struct folio *folio)
+static bool noop_dirty_folio(struct address_space *mapping, struct folio *folio)
{
if (!folio_test_dirty(folio))
return !folio_test_set_dirty(folio);
return false;
}
-EXPORT_SYMBOL(noop_dirty_folio);
Please inline this into folio_mark_dirty() instead of calling it.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] fs: clean up usage of noop_dirty_folio
2023-08-21 12:20 ` Matthew Wilcox
@ 2023-08-28 6:36 ` Christoph Hellwig
0 siblings, 0 replies; 4+ messages in thread
From: Christoph Hellwig @ 2023-08-28 6:36 UTC (permalink / raw)
To: Matthew Wilcox
Cc: Jan Kara, Xueshi Hu, dan.j.williams, vishal.l.verma, dave.jiang,
jayalk, daniel, deller, bcrl, viro, brauner, jack, tytso,
adilger.kernel, miklos, mike.kravetz, muchun.song, djwong, akpm,
hughd, nvdimm, linux-cxl, linux-kernel, linux-fbdev, dri-devel,
linux-aio, linux-fsdevel, linux-ext4, linux-mm, linux-xfs
On Mon, Aug 21, 2023 at 01:20:33PM +0100, Matthew Wilcox wrote:
> I was hoping Christoph would weigh in ;-) I don't have a strong
I've enjoyed 2 weeks of almost uninterrupted vacation.
I agree with this patch and also your incremental improvements.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2023-08-28 6:37 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2023-08-19 12:42 [PATCH] fs: clean up usage of noop_dirty_folio Xueshi Hu
2023-08-21 11:16 ` Jan Kara
2023-08-21 12:20 ` Matthew Wilcox
2023-08-28 6:36 ` Christoph Hellwig
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