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-rw-r--r--fs/xfs/xfs_vnodeops.c22
1 files changed, 19 insertions, 3 deletions
diff --git a/fs/xfs/xfs_vnodeops.c b/fs/xfs/xfs_vnodeops.c
index 6c18745..9b6c94e 100644
--- a/fs/xfs/xfs_vnodeops.c
+++ b/fs/xfs/xfs_vnodeops.c
@@ -2315,17 +2315,33 @@ xfs_change_file_space(
case XFS_IOC_ALLOCSP64:
case XFS_IOC_FREESP:
case XFS_IOC_FREESP64:
+ /*
+ * These operations actually do IO when extending the file, but
+ * the allocation is done seperately to the zeroing that is
+ * done. This set of operations need to be serialised against
+ * other IO operations, such as truncate and buffered IO. We
+ * need to take the IOLOCK here to serialise the allocation and
+ * zeroing IO to prevent other IOLOCK holders (e.g. getbmap,
+ * truncate, direct IO) from racing against the transient
+ * allocated but not written state we can have here.
+ */
+ xfs_ilock(ip, XFS_IOLOCK_EXCL);
if (startoffset > fsize) {
error = xfs_alloc_file_space(ip, fsize,
- startoffset - fsize, 0, attr_flags);
- if (error)
+ startoffset - fsize, 0,
+ attr_flags | XFS_ATTR_NOLOCK);
+ if (error) {
+ xfs_iunlock(ip, XFS_IOLOCK_EXCL);
break;
+ }
}
iattr.ia_valid = ATTR_SIZE;
iattr.ia_size = startoffset;
- error = xfs_setattr_size(ip, &iattr, attr_flags);
+ error = xfs_setattr_size(ip, &iattr,
+ attr_flags | XFS_ATTR_NOLOCK);
+ xfs_iunlock(ip, XFS_IOLOCK_EXCL);
if (error)
return error;
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