From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- include/linux/shmem_fs.h | 164 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 164 insertions(+) create mode 100644 include/linux/shmem_fs.h (limited to 'include/linux/shmem_fs.h') diff --git a/include/linux/shmem_fs.h b/include/linux/shmem_fs.h new file mode 100644 index 000000000..d500ea967 --- /dev/null +++ b/include/linux/shmem_fs.h @@ -0,0 +1,164 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __SHMEM_FS_H +#define __SHMEM_FS_H + +#include +#include +#include +#include +#include +#include +#include + +/* 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 vm_area_struct *vma, struct inode *inode, + pgoff_t index, bool shmem_huge_force); +static inline bool shmem_huge_enabled(struct vm_area_struct *vma, + bool shmem_huge_force) +{ + return shmem_is_huge(vma, file_inode(vma->vm_file), vma->vm_pgoff, + shmem_huge_force); +} +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); + +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 -- cgit v1.2.3