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memfd: export memfd_{add,get}_seals()

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Patch series "mm: memfd_luo: preserve file seals", v2.

This series adds support for preserving file seals when preserving a memfd
using LUO.  Patch 1 exports some memfd seal manipulation functions and
patch 2 adds support for preserving them.  Since it makes changes to the
serialized data structure for memfd, it also bumps the version number.


This patch (of 2):

Support for preserving file seals will be added to memfd preservation
using the Live Update Orchestrator (LUO).  Export memfd_{add,get}_seals)()
so memfd_luo can use them to manipulate the seals.

Link: https://lkml.kernel.org/r/20260216185946.1215770-1-pratyush@kernel.org
Link: https://lkml.kernel.org/r/20260216185946.1215770-2-pratyush@kernel.org
Signed-off-by: Pratyush Yadav (Google) <pratyush@kernel.org>
Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Tested-by: Samiullah Khawaja <skhawaja@google.com>
Cc: Alexander Graf <graf@amazon.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Pratyush Yadav (Google)
2026-02-16 19:59:32 +01:00
committed by Andrew Morton
parent 1df1a1b950
commit 1beb9b7223
2 changed files with 14 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
include/linux/memfd.h
View File

@@ -18,6 +18,8 @@ struct folio *memfd_alloc_folio(struct file *memfd, pgoff_t idx);
*/
int memfd_check_seals_mmap(struct file *file, vm_flags_t *vm_flags_ptr);
struct file *memfd_alloc_file(const char *name, unsigned int flags);
int memfd_get_seals(struct file *file);
int memfd_add_seals(struct file *file, unsigned int seals);
#else
static inline long memfd_fcntl(struct file *f, unsigned int c, unsigned int a)
{
@@ -37,6 +39,16 @@ static inline struct file *memfd_alloc_file(const char *name, unsigned int flags
{
return ERR_PTR(-EINVAL);
}
static inline int memfd_get_seals(struct file *file)
{
return -EINVAL;
}
static inline int memfd_add_seals(struct file *file, unsigned int seals)
{
return -EINVAL;
}
#endif
#endif /* __LINUX_MEMFD_H */

4
mm/memfd.c
View File

@@ -227,7 +227,7 @@ static unsigned int *memfd_file_seals_ptr(struct file *file)
F_SEAL_WRITE | \
F_SEAL_FUTURE_WRITE)
static int memfd_add_seals(struct file *file, unsigned int seals)
int memfd_add_seals(struct file *file, unsigned int seals)
{
struct inode *inode = file_inode(file);
unsigned int *file_seals;
@@ -309,7 +309,7 @@ unlock:
return error;
}
static int memfd_get_seals(struct file *file)
int memfd_get_seals(struct file *file)
{
unsigned int *seals = memfd_file_seals_ptr(file);