From: "Matthew Wilcox (Oracle)" <[email protected]> The page cache needs to know whether the filesystem supports pages > PAGE_SIZE.
Signed-off-by: Matthew Wilcox (Oracle) <[email protected]> --- fs/inode.c | 2 ++ include/linux/fs.h | 1 + include/linux/pagemap.h | 6 ++++++ 3 files changed, 9 insertions(+) diff --git a/fs/inode.c b/fs/inode.c index 93d9252a00ab..a92947d63098 100644 --- a/fs/inode.c +++ b/fs/inode.c @@ -181,6 +181,8 @@ int inode_init_always(struct super_block *sb, struct inode *inode) mapping->a_ops = &empty_aops; mapping->host = inode; mapping->flags = 0; + if (sb->s_type->fs_flags & FS_LARGE_PAGES) + __set_bit(AS_LARGE_PAGES, &mapping->flags); mapping->wb_err = 0; atomic_set(&mapping->i_mmap_writable, 0); #ifdef CONFIG_READ_ONLY_THP_FOR_FS diff --git a/include/linux/fs.h b/include/linux/fs.h index 55c743925c40..777783c8760b 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2241,6 +2241,7 @@ struct file_system_type { #define FS_HAS_SUBTYPE 4 #define FS_USERNS_MOUNT 8 /* Can be mounted by userns root */ #define FS_DISALLOW_NOTIFY_PERM 16 /* Disable fanotify permission events */ +#define FS_LARGE_PAGES 8192 /* Remove once all fs converted */ #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() during rename() internally. */ int (*init_fs_context)(struct fs_context *); const struct fs_parameter_spec *parameters; diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index 36bfc9d855bb..ea869a7fda7a 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -29,6 +29,7 @@ enum mapping_flags { AS_EXITING = 4, /* final truncate in progress */ /* writeback related tags are not used */ AS_NO_WRITEBACK_TAGS = 5, + AS_LARGE_PAGES = 6, /* large pages supported */ }; /** @@ -116,6 +117,11 @@ static inline void mapping_set_gfp_mask(struct address_space *m, gfp_t mask) m->gfp_mask = mask; } +static inline bool mapping_large_pages(struct address_space *mapping) +{ + return test_bit(AS_LARGE_PAGES, &mapping->flags); +} + void release_pages(struct page **pages, int nr); /* -- 2.26.2
