167 строки
6.2 KiB
C
167 строки
6.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __SHMEM_FS_H
|
|
#define __SHMEM_FS_H
|
|
|
|
#include <linux/file.h>
|
|
#include <linux/swap.h>
|
|
#include <linux/mempolicy.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/percpu_counter.h>
|
|
#include <linux/xattr.h>
|
|
#include <linux/fs_parser.h>
|
|
|
|
/* inode in-kernel data */
|
|
|
|
struct shmem_inode_info {
|
|
spinlock_t lock;
|
|
unsigned int seals; /* shmem seals */
|
|
unsigned long flags;
|
|
unsigned long alloced; /* data pages alloced to file */
|
|
unsigned long swapped; /* subtotal assigned to swap */
|
|
pgoff_t fallocend; /* highest fallocate endindex */
|
|
struct list_head shrinklist; /* shrinkable hpage inodes */
|
|
struct list_head swaplist; /* chain of maybes on swap */
|
|
struct shared_policy policy; /* NUMA memory alloc policy */
|
|
struct simple_xattrs xattrs; /* list of xattrs */
|
|
atomic_t stop_eviction; /* hold when working on inode */
|
|
struct timespec64 i_crtime; /* file creation time */
|
|
unsigned int fsflags; /* flags for FS_IOC_[SG]ETFLAGS */
|
|
struct inode vfs_inode;
|
|
};
|
|
|
|
#define SHMEM_FL_USER_VISIBLE FS_FL_USER_VISIBLE
|
|
#define SHMEM_FL_USER_MODIFIABLE \
|
|
(FS_IMMUTABLE_FL | FS_APPEND_FL | FS_NODUMP_FL | FS_NOATIME_FL)
|
|
#define SHMEM_FL_INHERITED (FS_NODUMP_FL | FS_NOATIME_FL)
|
|
|
|
struct shmem_sb_info {
|
|
unsigned long max_blocks; /* How many blocks are allowed */
|
|
struct percpu_counter used_blocks; /* How many are allocated */
|
|
unsigned long max_inodes; /* How many inodes are allowed */
|
|
unsigned long free_inodes; /* How many are left for allocation */
|
|
raw_spinlock_t stat_lock; /* Serialize shmem_sb_info changes */
|
|
umode_t mode; /* Mount mode for root directory */
|
|
unsigned char huge; /* Whether to try for hugepages */
|
|
kuid_t uid; /* Mount uid for root directory */
|
|
kgid_t gid; /* Mount gid for root directory */
|
|
bool full_inums; /* If i_ino should be uint or ino_t */
|
|
ino_t next_ino; /* The next per-sb inode number to use */
|
|
ino_t __percpu *ino_batch; /* The next per-cpu inode number to use */
|
|
struct mempolicy *mpol; /* default memory policy for mappings */
|
|
spinlock_t shrinklist_lock; /* Protects shrinklist */
|
|
struct list_head shrinklist; /* List of shinkable inodes */
|
|
unsigned long shrinklist_len; /* Length of shrinklist */
|
|
};
|
|
|
|
static inline struct shmem_inode_info *SHMEM_I(struct inode *inode)
|
|
{
|
|
return container_of(inode, struct shmem_inode_info, vfs_inode);
|
|
}
|
|
|
|
/*
|
|
* Functions in mm/shmem.c called directly from elsewhere:
|
|
*/
|
|
extern const struct fs_parameter_spec shmem_fs_parameters[];
|
|
extern void shmem_init(void);
|
|
extern int shmem_init_fs_context(struct fs_context *fc);
|
|
extern struct file *shmem_file_setup(const char *name,
|
|
loff_t size, unsigned long flags);
|
|
extern struct file *shmem_kernel_file_setup(const char *name, loff_t size,
|
|
unsigned long flags);
|
|
extern struct file *shmem_file_setup_with_mnt(struct vfsmount *mnt,
|
|
const char *name, loff_t size, unsigned long flags);
|
|
extern int shmem_zero_setup(struct vm_area_struct *);
|
|
extern unsigned long shmem_get_unmapped_area(struct file *, unsigned long addr,
|
|
unsigned long len, unsigned long pgoff, unsigned long flags);
|
|
extern int shmem_lock(struct file *file, int lock, struct ucounts *ucounts);
|
|
#ifdef CONFIG_SHMEM
|
|
extern const struct address_space_operations shmem_aops;
|
|
static inline bool shmem_mapping(struct address_space *mapping)
|
|
{
|
|
return mapping->a_ops == &shmem_aops;
|
|
}
|
|
#else
|
|
static inline bool shmem_mapping(struct address_space *mapping)
|
|
{
|
|
return false;
|
|
}
|
|
#endif /* CONFIG_SHMEM */
|
|
extern void shmem_unlock_mapping(struct address_space *mapping);
|
|
extern struct page *shmem_read_mapping_page_gfp(struct address_space *mapping,
|
|
pgoff_t index, gfp_t gfp_mask);
|
|
extern void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end);
|
|
int shmem_unuse(unsigned int type);
|
|
|
|
extern bool shmem_is_huge(struct inode *inode, pgoff_t index, bool shmem_huge_force,
|
|
struct mm_struct *mm, unsigned long vm_flags);
|
|
extern unsigned long shmem_swap_usage(struct vm_area_struct *vma);
|
|
extern unsigned long shmem_partial_swap_usage(struct address_space *mapping,
|
|
pgoff_t start, pgoff_t end);
|
|
|
|
/* Flag allocation requirements to shmem_get_folio */
|
|
enum sgp_type {
|
|
SGP_READ, /* don't exceed i_size, don't allocate page */
|
|
SGP_NOALLOC, /* similar, but fail on hole or use fallocated page */
|
|
SGP_CACHE, /* don't exceed i_size, may allocate page */
|
|
SGP_WRITE, /* may exceed i_size, may allocate !Uptodate page */
|
|
SGP_FALLOC, /* like SGP_WRITE, but make existing page Uptodate */
|
|
};
|
|
|
|
int shmem_get_folio(struct inode *inode, pgoff_t index, struct folio **foliop,
|
|
enum sgp_type sgp);
|
|
struct folio *shmem_read_folio_gfp(struct address_space *mapping,
|
|
pgoff_t index, gfp_t gfp);
|
|
|
|
static inline struct folio *shmem_read_folio(struct address_space *mapping,
|
|
pgoff_t index)
|
|
{
|
|
return shmem_read_folio_gfp(mapping, index, mapping_gfp_mask(mapping));
|
|
}
|
|
|
|
static inline struct page *shmem_read_mapping_page(
|
|
struct address_space *mapping, pgoff_t index)
|
|
{
|
|
return shmem_read_mapping_page_gfp(mapping, index,
|
|
mapping_gfp_mask(mapping));
|
|
}
|
|
|
|
static inline bool shmem_file(struct file *file)
|
|
{
|
|
if (!IS_ENABLED(CONFIG_SHMEM))
|
|
return false;
|
|
if (!file || !file->f_mapping)
|
|
return false;
|
|
return shmem_mapping(file->f_mapping);
|
|
}
|
|
|
|
/*
|
|
* If fallocate(FALLOC_FL_KEEP_SIZE) has been used, there may be pages
|
|
* beyond i_size's notion of EOF, which fallocate has committed to reserving:
|
|
* which split_huge_page() must therefore not delete. This use of a single
|
|
* "fallocend" per inode errs on the side of not deleting a reservation when
|
|
* in doubt: there are plenty of cases when it preserves unreserved pages.
|
|
*/
|
|
static inline pgoff_t shmem_fallocend(struct inode *inode, pgoff_t eof)
|
|
{
|
|
return max(eof, SHMEM_I(inode)->fallocend);
|
|
}
|
|
|
|
extern bool shmem_charge(struct inode *inode, long pages);
|
|
extern void shmem_uncharge(struct inode *inode, long pages);
|
|
|
|
#ifdef CONFIG_USERFAULTFD
|
|
#ifdef CONFIG_SHMEM
|
|
extern int shmem_mfill_atomic_pte(struct mm_struct *dst_mm, pmd_t *dst_pmd,
|
|
struct vm_area_struct *dst_vma,
|
|
unsigned long dst_addr,
|
|
unsigned long src_addr,
|
|
bool zeropage, bool wp_copy,
|
|
struct page **pagep);
|
|
#else /* !CONFIG_SHMEM */
|
|
#define shmem_mfill_atomic_pte(dst_mm, dst_pmd, dst_vma, dst_addr, \
|
|
src_addr, zeropage, wp_copy, pagep) ({ BUG(); 0; })
|
|
#endif /* CONFIG_SHMEM */
|
|
#endif /* CONFIG_USERFAULTFD */
|
|
|
|
#endif
|