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Subject[PATCH v5 07/39] fs: Add a filesystem flag for large pages
Date
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>

The page cache needs to know whether the filesystem supports pages >
PAGE_SIZE.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
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
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