| Message ID | 20230828075449.262510-1-xueshi.hu@smartx.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [v2] fs: clean up usage of noop_dirty_folio | expand |
On Mon 28-08-23 15:54:49, Xueshi Hu wrote: > In folio_mark_dirty(), it can 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> Looks good to me. Feel free to add: Reviewed-by: Jan Kara <jack@suse.cz> Honza > --- > Changes in v2: > - make noop_dirty_folio() inline as suggested by Matthew > - v1: https://lore.kernel.org/linux-mm/ZOxAfrz9etoVUfLQ@infradead.org/T/#m073d45909b1df03ff09f382557dc4e84d0607c49 > > 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 | 18 +++++------------- > mm/secretmem.c | 1 - > mm/shmem.c | 1 - > mm/swap_state.c | 1 - > 14 files changed, 5 insertions(+), 38 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..d2d739109bfe 100644 > --- a/mm/page-writeback.c > +++ b/mm/page-writeback.c > @@ -2585,17 +2585,6 @@ int do_writepages(struct address_space *mapping, struct writeback_control *wbc) > return ret; > } > > -/* > - * For address_spaces which do not use buffers nor write back. > - */ > -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. > * > @@ -2799,10 +2788,13 @@ 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); > + if (!folio_test_dirty(folio)) > + return !folio_test_set_dirty(folio); > + return false; > } > EXPORT_SYMBOL(folio_mark_dirty); > > 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 d963c747dabc..9bdef68a088a 100644 > --- a/mm/shmem.c > +++ b/mm/shmem.c > @@ -4090,7 +4090,6 @@ 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 >
Looks good:
Reviewed-by: Christoph Hellwig <hch@lst.de>
On Mon, Aug 28, 2023 at 03:54:49PM +0800, Xueshi Hu wrote: > In folio_mark_dirty(), it can 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> Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
On Mon, Aug 28, 2023 at 03:54:49PM +0800, Xueshi Hu wrote: > In folio_mark_dirty(), it can 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. I'd put the last sentence as 'In dev_dax_aops and fb_deferred_io_aops replacing .dirty_folio with NULL makes them identical to default (empty_aops) and since we never compare ->a_ops pointer with either of those, we can remove them completely'. There could've been places like #define is_fb_deferred(mapping) (mapping)->a_ops == fb_deferred_io_aops and those would've been broken by that. The fact that there's nothing of that sort in the tree ought to be mentioned in commit message. Note that we *do* have places where method table comparisons are used in predicates like that, so it's not a pure theory; sure, missing that would've probably ended up with broken build, but that can easily be dependent upon the config (and that, alas, is also not a pure theory - BTDT). In this case the change is correct, fortunately... Other than that part of commit message - Acked-by: Al Viro <viro@zeniv.linux.org.uk>
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..d2d739109bfe 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -2585,17 +2585,6 @@ int do_writepages(struct address_space *mapping, struct writeback_control *wbc) return ret; } -/* - * For address_spaces which do not use buffers nor write back. - */ -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. * @@ -2799,10 +2788,13 @@ 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); + if (!folio_test_dirty(folio)) + return !folio_test_set_dirty(folio); + return false; } EXPORT_SYMBOL(folio_mark_dirty); 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 d963c747dabc..9bdef68a088a 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -4090,7 +4090,6 @@ 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
In folio_mark_dirty(), it can 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> --- Changes in v2: - make noop_dirty_folio() inline as suggested by Matthew - v1: https://lore.kernel.org/linux-mm/ZOxAfrz9etoVUfLQ@infradead.org/T/#m073d45909b1df03ff09f382557dc4e84d0607c49 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 | 18 +++++------------- mm/secretmem.c | 1 - mm/shmem.c | 1 - mm/swap_state.c | 1 - 14 files changed, 5 insertions(+), 38 deletions(-)