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/*********************************************************
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* Copyright (C) 2006 VMware, Inc. All rights reserved.
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation version 2 and no later version.
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*********************************************************/
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#ifndef __COMPAT_FS_H__
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# define __COMPAT_FS_H__
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* 2.6.5+ kernels define FS_BINARY_MOUNTDATA. Since it didn't exist and
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* wasn't used prior, it's safe to define it to zero.
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#ifndef FS_BINARY_MOUNTDATA
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#define FS_BINARY_MOUNTDATA 0
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* MAX_LFS_FILESIZE wasn't defined until 2.5.4.
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#ifndef MAX_LFS_FILESIZE
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# include <linux/pagemap.h>
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# if BITS_PER_LONG == 32
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# define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG - 1)) - 1)
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# elif BITS_PER_LONG == 64
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# define MAX_LFS_FILESIZE 0x7fffffffffffffffUL
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* sendfile as a VFS op was born in 2.5.30. Unfortunately, it also changed
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* signatures, first in 2.5.47, then again in 2.5.70, then again in 2.6.8.
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* Luckily, the 2.6.8+ signature is the same as the 2.5.47 signature. And
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* as of 2.6.23-rc1 sendfile is gone, replaced by splice_read...
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* Let's not support sendfile from 2.5.30 to 2.5.47, because the 2.5.30
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* signature is much different and file_send_actor isn't externed.
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23)
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#define VMW_SENDFILE_NONE
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#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 8)
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#define VMW_SENDFILE_NEW
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#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 70)
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#define VMW_SENDFILE_OLD
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#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 47)
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#define VMW_SENDFILE_NEW
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#define VMW_SENDFILE_NONE
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* splice_read is there since 2.6.17, but let's avoid 2.6.17-rcX kernels...
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* After all nobody is using splice system call until 2.6.23 using it to
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 18)
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#define VMW_SPLICE_READ 1
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* Filesystems wishing to use generic page cache read/write routines are
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* supposed to implement aio_read and aio_write (calling into
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* generic_file_aio_read() and generic_file_aio_write() if necessary).
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* The VFS exports do_sync_read() and do_sync_write() as the "new"
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* generic_file_read() and generic_file_write(), but filesystems need not
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* actually implement read and write- the VFS will automatically call
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* do_sync_write() and do_sync_read() when applications invoke the standard
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* read() and write() system calls.
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* In 2.6.19, generic_file_read() and generic_file_write() were removed,
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* necessitating this change. AIO dates as far back as 2.5.42, but the API has
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* changed over time, so for simplicity, we'll only enable it from 2.6.19 and
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 19)
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* The alloc_inode and destroy_inode VFS ops didn't exist prior to 2.4.21.
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* Without these functions, file systems can't embed inodes.
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 4, 21)
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# define VMW_EMBED_INODE
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* iget() was removed from the VFS as of 2.6.25-rc1. The replacement for iget()
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* is iget_locked() which was added in 2.5.17.
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 17)
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# define VMW_USE_IGET_LOCKED
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* parent_ino was born in 2.5.5. For older kernels, let's use 2.5.5
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* implementation. It uses the dcache lock which is OK because per-dentry
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* locking appeared after 2.5.5.
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 5)
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#define compat_parent_ino(dentry) parent_ino(dentry)
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#define compat_parent_ino(dentry) \
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spin_lock(&dcache_lock); \
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res = dentry->d_parent->d_inode->i_ino; \
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spin_unlock(&dcache_lock); \
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* putname changed to __putname in 2.6.6.
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#define compat___getname() __getname()
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#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 6)
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#define compat___putname(name) putname(name)
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#define compat___putname(name) __putname(name)
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* inc_nlink, drop_nlink, and clear_nlink were added in 2.6.19.
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#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19)
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#define compat_inc_nlink(inode) ((inode)->i_nlink++)
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#define compat_drop_nlink(inode) ((inode)->i_nlink--)
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#define compat_clear_nlink(inode) ((inode)->i_nlink = 0)
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#define compat_inc_nlink(inode) inc_nlink(inode)
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#define compat_drop_nlink(inode) drop_nlink(inode)
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#define compat_clear_nlink(inode) clear_nlink(inode)
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* i_size_write and i_size_read were introduced in 2.6.0-test1
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* (though we'll look for them as of 2.6.1). They employ slightly different
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* locking in order to guarantee atomicity, depending on the length of a long,
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* whether the kernel is SMP, or whether the kernel is preemptible. Prior to
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* i_size_write and i_size_read, there was no such locking, so that's the
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* behavior we'll emulate.
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#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 1)
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#define compat_i_size_read(inode) ((inode)->i_size)
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#define compat_i_size_write(inode, size) ((inode)->i_size = size)
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#define compat_i_size_read(inode) i_size_read(inode)
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#define compat_i_size_write(inode, size) i_size_write(inode, size)
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* filemap_fdatawrite was introduced in 2.5.12. Prior to that, modules used
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* filemap_fdatasync instead. In 2.4.18, both filemap_fdatawrite and
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* filemap_fdatawait began returning status codes. Prior to that, they were
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* void functions, so we'll just have them return 0.
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#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 4, 18)
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#define compat_filemap_fdatawrite(mapping) \
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filemap_fdatasync(mapping); \
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#define compat_filemap_fdatawait(mapping) \
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filemap_fdatawait(mapping); \
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#elif LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 12)
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#define compat_filemap_fdatawrite(mapping) filemap_fdatasync(mapping)
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#define compat_filemap_fdatawait(mapping) filemap_fdatawait(mapping)
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#define compat_filemap_fdatawrite(mapping) filemap_fdatawrite(mapping)
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#define compat_filemap_fdatawait(mapping) filemap_fdatawait(mapping)
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* filemap_write_and_wait was introduced in 2.6.6 and exported for module use
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* in 2.6.16. It's really just a simple wrapper around filemap_fdatawrite and
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* and filemap_fdatawait, which initiates a flush of all dirty pages, then
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* waits for the pages to flush. The implementation here is a simplified form
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* of the one found in 2.6.20-rc3.
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* Unfortunately, it just isn't possible to implement this prior to 2.4.5, when
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* neither filemap_fdatawait nor filemap_fdatasync were exported for module
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* use. So we'll define it out and hope for the best.
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#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 4, 5)
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#define compat_filemap_write_and_wait(mapping)
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#elif LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 16)
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#define compat_filemap_write_and_wait(mapping) \
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if (mapping->nrpages) { \
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result = compat_filemap_fdatawrite(mapping); \
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if (result != -EIO) { \
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int result2 = compat_filemap_fdatawait(mapping); \
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#define compat_filemap_write_and_wait(mapping) filemap_write_and_wait(mapping)
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* invalidate_remote_inode was introduced in 2.6.0-test5. Prior to that,
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* filesystems wishing to invalidate pages belonging to an inode called
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* invalidate_inode_pages.
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#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0)
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#define compat_invalidate_remote_inode(inode) invalidate_inode_pages(inode)
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#define compat_invalidate_remote_inode(inode) invalidate_remote_inode(inode)
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#endif /* __COMPAT_FS_H__ */
added
removed
modules/linux/vmblock/include/compat_fs.h
