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linux: fs: Add folio cache to address_space

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Add a simple folio cache array to struct address_space for U-Boot's
folio management, avoiding the need for Linux's XArray/radix tree
infrastructure.

Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
This commit is contained in:
Simon Glass
2025-12-30 08:35:37 -07:00
parent 1e8f07fe57
commit 24a1efb590
1 changed files with 10 additions and 0 deletions
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10
include/linux/fs.h
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@@ -50,6 +50,11 @@ struct path {
/* Buffer operations are in buffer_head.h */
#ifdef __UBOOT__
/* Maximum number of cached folios per address_space */
#define FOLIO_CACHE_MAX 64
#endif
/* address_space - extended for inode.c */
struct address_space {
struct inode *host;
@@ -58,6 +63,11 @@ struct address_space {
unsigned long writeback_index;
struct list_head i_private_list;
const struct address_space_operations *a_ops;
#ifdef __UBOOT__
/* Simple folio cache for U-Boot (no XA/radix tree) */
struct folio *folio_cache[FOLIO_CACHE_MAX];
int folio_cache_count;
#endif
};
/* block_device - minimal stub */