2005-04-17 05:20:36 +07:00
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#ifndef _LINUX_RAMFS_H
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#define _LINUX_RAMFS_H
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2010-03-04 21:32:18 +07:00
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struct inode *ramfs_get_inode(struct super_block *sb, const struct inode *dir,
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2011-07-26 14:16:55 +07:00
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umode_t mode, dev_t dev);
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2010-07-25 14:46:36 +07:00
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extern struct dentry *ramfs_mount(struct file_system_type *fs_type,
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int flags, const char *dev_name, void *data);
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2005-04-17 05:20:36 +07:00
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2013-04-30 05:06:12 +07:00
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#ifdef CONFIG_MMU
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static inline int
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ramfs_nommu_expand_for_mapping(struct inode *inode, size_t newsize)
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{
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return 0;
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}
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#else
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2008-10-03 04:50:16 +07:00
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extern int ramfs_nommu_expand_for_mapping(struct inode *inode, size_t newsize);
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[PATCH] NOMMU: Provide shared-writable mmap support on ramfs
The attached patch makes ramfs support shared-writable mmaps by:
(1) Attempting to perform a contiguous block allocation to the requested size
when truncate attempts to increase the file from zero size, such as
happens when:
fd = shm_open("/file/on/ramfs", ...):
ftruncate(fd, size_requested);
addr = mmap(NULL, subsize, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_SHARED,
fd, offset);
(2) Permitting any shared-writable mapping over any contiguous set of extant
pages. get_unmapped_area() will return the address into the actual ramfs
pages. The mapping may start anywhere and be of any size, but may not go
over the end of file. Multiple mappings may overlap in any way.
(3) Not permitting a file to be shrunk if it would truncate any shared
mappings (private mappings are copied).
Thus this patch provides support for POSIX shared memory on NOMMU kernels,
with certain limitations such as there being a large enough block of pages
available to support the allocation and it only working on directly mappable
filesystems.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-06 15:11:41 +07:00
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extern unsigned long ramfs_nommu_get_unmapped_area(struct file *file,
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unsigned long addr,
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unsigned long len,
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unsigned long pgoff,
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unsigned long flags);
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extern int ramfs_nommu_mmap(struct file *file, struct vm_area_struct *vma);
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#endif
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2006-03-28 16:56:42 +07:00
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extern const struct file_operations ramfs_file_operations;
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2009-09-28 01:29:37 +07:00
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extern const struct vm_operations_struct generic_file_vm_ops;
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2013-09-12 04:26:10 +07:00
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extern int __init init_ramfs_fs(void);
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2005-04-17 05:20:36 +07:00
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2010-03-17 03:55:21 +07:00
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int ramfs_fill_super(struct super_block *sb, void *data, int silent);
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2005-04-17 05:20:36 +07:00
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#endif
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