49eb1f4806
Primary purpose of change: to support the mmap implementation, VM must know both (a) about some block metadata for FS cache blocks, i.e. inode numbers and inode offsets where applicable; and (b) know about *all* cache blocks, i.e. also of the FS primary caches and not just the blocks that spill into the secondary one. This changes the interface and VM data structures. This change is only for the interface (libminixfs) and VM data structures; the filesystem code is unmodified, so although the secondary cache will be used as normal, blocks will not be annotated with inode information until the FS is modified to provide this information. Until it is modified, mmap of files will fail gracefully on such filesystems. This is indicated to VFS/VM by returning ENOSYS for REQ_PEEK. Change-Id: I1d2df6c485e6c5e89eb28d9055076cc02629594e
33 lines
1.1 KiB
C
33 lines
1.1 KiB
C
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#ifndef _MEMTYPE_H
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#define _MEMTYPE_H 1
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struct vmproc;
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struct vir_region;
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struct phys_region;
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typedef void (*vfs_callback_t)(struct vmproc *vmp, message *m,
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void *, void *);
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typedef struct mem_type {
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char *name; /* human-readable name */
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int (*ev_new)(struct vir_region *region);
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void (*ev_delete)(struct vir_region *region);
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int (*ev_reference)(struct phys_region *pr, struct phys_region *newpr);
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int (*ev_unreference)(struct phys_region *pr);
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int (*ev_pagefault)(struct vmproc *vmp, struct vir_region *region,
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struct phys_region *ph, int write, vfs_callback_t cb, void *, int);
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int (*ev_resize)(struct vmproc *vmp, struct vir_region *vr, vir_bytes len);
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void (*ev_split)(struct vmproc *vmp, struct vir_region *vr,
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struct vir_region *r1, struct vir_region *r2);
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int (*writable)(struct phys_region *pr);
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int (*ev_sanitycheck)(struct phys_region *pr, char *file, int line);
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int (*ev_copy)(struct vir_region *vr, struct vir_region *newvr);
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int (*ev_lowshrink)(struct vir_region *vr, vir_bytes len);
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u32_t (*regionid)(struct vir_region *vr);
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int (*refcount)(struct vir_region *vr);
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} mem_type_t;
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#endif
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