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Release 4.12 include/linux/shmem_fs.h

Directory: include/linux
#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>

/* 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 */
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 */
struct inode		vfs_inode;

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 */
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 */
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); }


Linus Torvalds2496.00%266.67%
Neil Brown14.00%133.33%

/* * Functions in mm/shmem.c called directly from elsewhere: */ extern int shmem_init(void); extern int shmem_fill_super(struct super_block *sb, void *data, int silent); 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 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 user_struct *user); #ifdef CONFIG_SHMEM extern bool shmem_mapping(struct address_space *mapping); #else
static inline bool shmem_mapping(struct address_space *mapping) { return false; }


Hugh Dickins15100.00%1100.00%

#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); extern int shmem_unuse(swp_entry_t entry, struct page *page); 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_getpage */ enum sgp_type { SGP_READ, /* don't exceed i_size, don't allocate page */ SGP_CACHE, /* don't exceed i_size, may allocate page */ SGP_NOHUGE, /* like SGP_CACHE, but no huge pages */ SGP_HUGE, /* like SGP_CACHE, huge pages preferred */ SGP_WRITE, /* may exceed i_size, may allocate !Uptodate page */ SGP_FALLOC, /* like SGP_WRITE, but make existing page Uptodate */ }; extern int shmem_getpage(struct inode *inode, pgoff_t index, struct page **pagep, enum sgp_type sgp);
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)); }


Hugh Dickins30100.00%1100.00%

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); }


Kirill A. Shutemov44100.00%1100.00%

extern bool shmem_charge(struct inode *inode, long pages); extern void shmem_uncharge(struct inode *inode, long pages); #ifdef CONFIG_TMPFS extern int shmem_add_seals(struct file *file, unsigned int seals); extern int shmem_get_seals(struct file *file); extern long shmem_fcntl(struct file *file, unsigned int cmd, unsigned long arg); #else
static inline long shmem_fcntl(struct file *f, unsigned int c, unsigned long a) { return -EINVAL; }


David Herrmann24100.00%1100.00%

#endif #ifdef CONFIG_TRANSPARENT_HUGE_PAGECACHE extern bool shmem_huge_enabled(struct vm_area_struct *vma); #else
static inline bool shmem_huge_enabled(struct vm_area_struct *vma) { return false; }


Kirill A. Shutemov15100.00%1100.00%

#endif #ifdef CONFIG_SHMEM extern int shmem_mcopy_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, struct page **pagep); #else #define shmem_mcopy_atomic_pte(dst_mm, dst_pte, dst_vma, dst_addr, \ src_addr, pagep) ({ BUG(); 0; }) #endif #endif

Overall Contributors

Hugh Dickins19727.67%1027.78%
Kirill A. Shutemov18025.28%513.89%
David Herrmann8111.38%12.78%
Mike Rapoport578.01%12.78%
Linus Torvalds (pre-git)466.46%12.78%
Linus Torvalds304.21%38.33%
Vlastimil Babka283.93%25.56%
Kay Sievers233.23%12.78%
Eric Paris212.95%25.56%
Andrew Morton152.11%25.56%
Johannes Weiner101.40%12.78%
Aristeu Sergio Rozanski Filho60.84%12.78%
Tim Chen60.84%12.78%
Lee Schermerhorn50.70%12.78%
Dave Jones30.42%12.78%
Eric W. Biedermann20.28%12.78%
Neil Brown10.14%12.78%
Robin Holt10.14%12.78%
Directory: include/linux
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