Viewing: add-and-use-a-per-mapping-stable-writes-flag-rhel9.patch
Index: linux-5.14.0-162.23.1.el9_1/block/bdev.c
===================================================================
--- linux-5.14.0-162.23.1.el9_1.orig/block/bdev.c
+++ linux-5.14.0-162.23.1.el9_1/block/bdev.c
@@ -506,6 +506,8 @@ struct block_device *bdev_alloc(struct g
void bdev_add(struct block_device *bdev, dev_t dev)
{
+ if (bdev_stable_writes(bdev))
+ mapping_set_stable_writes(bdev->bd_inode->i_mapping);
bdev->bd_dev = dev;
bdev->bd_inode->i_rdev = dev;
bdev->bd_inode->i_ino = dev;
Index: linux-5.14.0-162.23.1.el9_1/fs/inode.c
===================================================================
--- linux-5.14.0-162.23.1.el9_1.orig/fs/inode.c
+++ linux-5.14.0-162.23.1.el9_1/fs/inode.c
@@ -192,6 +192,8 @@ int inode_init_always(struct super_block
lockdep_set_class_and_name(&mapping->invalidate_lock,
&sb->s_type->invalidate_lock_key,
"mapping.invalidate_lock");
+ if (sb->s_iflags & SB_I_STABLE_WRITES)
+ mapping_set_stable_writes(mapping);
inode->i_private = NULL;
inode->i_mapping = mapping;
INIT_HLIST_HEAD(&inode->i_dentry); /* buggered by rcu freeing */
Index: linux-5.14.0-162.23.1.el9_1/include/linux/pagemap.h
===================================================================
--- linux-5.14.0-162.23.1.el9_1.orig/include/linux/pagemap.h
+++ linux-5.14.0-162.23.1.el9_1/include/linux/pagemap.h
@@ -147,6 +147,8 @@ enum mapping_flags {
/* writeback related tags are not used */
AS_NO_WRITEBACK_TAGS = 5,
AS_LARGE_FOLIO_SUPPORT = 6,
+ AS_STABLE_WRITES, /* must wait for writeback before modifying
+ folio contents */
};
/**
@@ -217,6 +219,21 @@ static inline int mapping_use_writeback_
return !test_bit(AS_NO_WRITEBACK_TAGS, &mapping->flags);
}
+static inline bool mapping_stable_writes(const struct address_space *mapping)
+{
+ return test_bit(AS_STABLE_WRITES, &mapping->flags);
+}
+
+static inline void mapping_set_stable_writes(struct address_space *mapping)
+{
+ set_bit(AS_STABLE_WRITES, &mapping->flags);
+}
+
+static inline void mapping_clear_stable_writes(struct address_space *mapping)
+{
+ clear_bit(AS_STABLE_WRITES, &mapping->flags);
+}
+
static inline gfp_t mapping_gfp_mask(struct address_space * mapping)
{
return mapping->gfp_mask;
Index: linux-5.14.0-162.23.1.el9_1/mm/page-writeback.c
===================================================================
--- linux-5.14.0-162.23.1.el9_1.orig/mm/page-writeback.c
+++ linux-5.14.0-162.23.1.el9_1/mm/page-writeback.c
@@ -2965,7 +2965,7 @@ EXPORT_SYMBOL_GPL(folio_wait_writeback_k
*/
void folio_wait_stable(struct folio *folio)
{
- if (folio_inode(folio)->i_sb->s_iflags & SB_I_STABLE_WRITES)
+ if (mapping_stable_writes(folio_mapping(folio)))
folio_wait_writeback(folio);
}
EXPORT_SYMBOL_GPL(folio_wait_stable);
