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fs: Add FOP_HUGE_PAGES

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Instead of checking for specific file_operations, add a bit to
file_operations which denotes a file that only contain hugetlb pages.
This lets us make hugetlbfs_file_operations static, and removes
is_file_shm_hugepages() completely.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Link: https://lore.kernel.org/r/20240407201122.3783877-1-willy@infradead.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2024-04-09 10:41:33 +02:00 committed by Christian Brauner
parent 629171657a
commit 886b94d25a
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GPG Key ID: 91C61BC06578DCA2
5 changed files with 10 additions and 20 deletions
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5
fs/hugetlbfs/inode.c
View File

@ -40,7 +40,7 @@
#include <linux/sched/mm.h>
static const struct address_space_operations hugetlbfs_aops;
const struct file_operations hugetlbfs_file_operations;
static const struct file_operations hugetlbfs_file_operations;
static const struct inode_operations hugetlbfs_dir_inode_operations;
static const struct inode_operations hugetlbfs_inode_operations;
@ -1301,13 +1301,14 @@ static void init_once(void *foo)
inode_init_once(&ei->vfs_inode);
}
const struct file_operations hugetlbfs_file_operations = {
static const struct file_operations hugetlbfs_file_operations = {
.read_iter = hugetlbfs_read_iter,
.mmap = hugetlbfs_file_mmap,
.fsync = noop_fsync,
.get_unmapped_area = hugetlb_get_unmapped_area,
.llseek = default_llseek,
.fallocate = hugetlbfs_fallocate,
.fop_flags = FOP_HUGE_PAGES,
};
static const struct inode_operations hugetlbfs_dir_inode_operations = {

2
include/linux/fs.h
View File

@ -2052,6 +2052,8 @@ struct file_operations {
#define FOP_MMAP_SYNC ((__force fop_flags_t)(1 << 2))
/* Supports non-exclusive O_DIRECT writes from multiple threads */
#define FOP_DIO_PARALLEL_WRITE ((__force fop_flags_t)(1 << 3))
/* Contains huge pages */
#define FOP_HUGE_PAGES ((__force fop_flags_t)(1 << 4))
/* Wrap a directory iterator that needs exclusive inode access */
int wrap_directory_iterator(struct file *, struct dir_context *,

8
include/linux/hugetlb.h
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@ -554,17 +554,13 @@ static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
}
extern const struct file_operations hugetlbfs_file_operations;
extern const struct vm_operations_struct hugetlb_vm_ops;
struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
int creat_flags, int page_size_log);
static inline bool is_file_hugepages(struct file *file)
static inline bool is_file_hugepages(const struct file *file)
{
if (file->f_op == &hugetlbfs_file_operations)
return true;
return is_file_shm_hugepages(file);
return file->f_op->fop_flags & FOP_HUGE_PAGES;
}
static inline struct hstate *hstate_inode(struct inode *i)

5
include/linux/shm.h
View File

@ -16,7 +16,6 @@ struct sysv_shm {
long do_shmat(int shmid, char __user *shmaddr, int shmflg, unsigned long *addr,
unsigned long shmlba);
bool is_file_shm_hugepages(struct file *file);
void exit_shm(struct task_struct *task);
#define shm_init_task(task) INIT_LIST_HEAD(&(task)->sysvshm.shm_clist)
#else
@ -30,10 +29,6 @@ static inline long do_shmat(int shmid, char __user *shmaddr,
{
return -ENOSYS;
}
static inline bool is_file_shm_hugepages(struct file *file)
{
return false;
}
static inline void exit_shm(struct task_struct *task)
{
}

10
ipc/shm.c
View File

@ -662,8 +662,8 @@ static const struct file_operations shm_file_operations = {
};
/*
* shm_file_operations_huge is now identical to shm_file_operations,
* but we keep it distinct for the sake of is_file_shm_hugepages().
* shm_file_operations_huge is now identical to shm_file_operations
* except for fop_flags
*/
static const struct file_operations shm_file_operations_huge = {
.mmap = shm_mmap,
@ -672,13 +672,9 @@ static const struct file_operations shm_file_operations_huge = {
.get_unmapped_area = shm_get_unmapped_area,
.llseek = noop_llseek,
.fallocate = shm_fallocate,
.fop_flags = FOP_HUGE_PAGES,
};
bool is_file_shm_hugepages(struct file *file)
{
return file->f_op == &shm_file_operations_huge;
}
static const struct vm_operations_struct shm_vm_ops = {
.open = shm_open, /* callback for a new vm-area open */
.close = shm_close, /* callback for when the vm-area is released */