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Commit 3ed65264 authored by David Chinner's avatar David Chinner Committed by Lachlan McIlroy
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[XFS] Implement fallocate. 



Implement the new generic callout for file preallocation. Atomically
change the file size if requested.

SGI-PV: 972756
SGI-Modid: xfs-linux-melb:xfs-kern:30009a

Signed-off-by: default avatarDavid Chinner <dgc@sgi.com>
Signed-off-by: default avatarChristoph Hellwig <hch@infradead.org>
Signed-off-by: default avatarLachlan McIlroy <lachlan@sgi.com>
parent 5d51eff4

fs/xfs/linux-2.6/xfs_iops.c

+43 −0
Original line number Diff line number Diff line
@@ -52,6 +52,7 @@ 
#include <linux/xattr.h>

#include <linux/namei.h>

#include <linux/security.h>

#include <linux/falloc.h>



/*

 * Bring the atime in the XFS inode uptodate.
@@ -794,6 +795,47 @@ xfs_vn_removexattr( 
	return namesp->attr_remove(vp, attr, xflags);

}



STATIC long

xfs_vn_fallocate(

	struct inode	*inode,

	int		mode,

	loff_t		offset,

	loff_t		len)

{

	long		error;

	loff_t		new_size = 0;

	xfs_flock64_t	bf;

	xfs_inode_t	*ip = XFS_I(inode);



	/* preallocation on directories not yet supported */

	error = -ENODEV;

	if (S_ISDIR(inode->i_mode))

		goto out_error;



	bf.l_whence = 0;

	bf.l_start = offset;

	bf.l_len = len;



	xfs_ilock(ip, XFS_IOLOCK_EXCL);

	error = xfs_change_file_space(ip, XFS_IOC_RESVSP, &bf,

						0, NULL, ATTR_NOLOCK);

	if (!error && !(mode & FALLOC_FL_KEEP_SIZE) &&

	    offset + len > i_size_read(inode))

		new_size = offset + len;



	/* Change file size if needed */

	if (new_size) {

		bhv_vattr_t	va;



		va.va_mask = XFS_AT_SIZE;

		va.va_size = new_size;

		error = xfs_setattr(ip, &va, ATTR_NOLOCK, NULL);

	}



	xfs_iunlock(ip, XFS_IOLOCK_EXCL);

out_error:

	return error;

}



const struct inode_operations xfs_inode_operations = {

	.permission		= xfs_vn_permission,
@@ -804,6 +846,7 @@ const struct inode_operations xfs_inode_operations = { 
	.getxattr		= xfs_vn_getxattr,

	.listxattr		= xfs_vn_listxattr,

	.removexattr		= xfs_vn_removexattr,

	.fallocate		= xfs_vn_fallocate,

};



const struct inode_operations xfs_dir_inode_operations = {