Commit 3ed65264 authored by David Chinner's avatar David Chinner Committed by Lachlan McIlroy

[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
...@@ -52,6 +52,7 @@ ...@@ -52,6 +52,7 @@
#include <linux/xattr.h> #include <linux/xattr.h>
#include <linux/namei.h> #include <linux/namei.h>
#include <linux/security.h> #include <linux/security.h>
#include <linux/falloc.h>
/* /*
* Bring the atime in the XFS inode uptodate. * Bring the atime in the XFS inode uptodate.
...@@ -794,6 +795,47 @@ xfs_vn_removexattr( ...@@ -794,6 +795,47 @@ xfs_vn_removexattr(
return namesp->attr_remove(vp, attr, xflags); 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 = { const struct inode_operations xfs_inode_operations = {
.permission = xfs_vn_permission, .permission = xfs_vn_permission,
...@@ -804,6 +846,7 @@ const struct inode_operations xfs_inode_operations = { ...@@ -804,6 +846,7 @@ const struct inode_operations xfs_inode_operations = {
.getxattr = xfs_vn_getxattr, .getxattr = xfs_vn_getxattr,
.listxattr = xfs_vn_listxattr, .listxattr = xfs_vn_listxattr,
.removexattr = xfs_vn_removexattr, .removexattr = xfs_vn_removexattr,
.fallocate = xfs_vn_fallocate,
}; };
const struct inode_operations xfs_dir_inode_operations = { const struct inode_operations xfs_dir_inode_operations = {
......
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