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Diffstat (limited to 'doc/coreutils.texi')
| -rw-r--r-- | doc/coreutils.texi | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/doc/coreutils.texi b/doc/coreutils.texi index acec76e4c..90a54b268 100644 --- a/doc/coreutils.texi +++ b/doc/coreutils.texi @@ -7861,6 +7861,10 @@ same time. @opindex direct @cindex direct I/O Use direct I/O for data, avoiding the buffer cache. +Note that the kernel may impose restrictions on read or write buffer sizes. +For example, with an ext4 destination file system and a linux-based kernel, +using @samp{oflag=direct} will cause writes to fail with @code{EINVAL} if the +output buffer size is not a multiple of 512. @item directory @opindex directory |