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Date: Sun, 24 Apr 2016 00:27:58 -0400 From: Theodore Ts'o <tytso@....edu> To: Ext4 Developers List <linux-ext4@...r.kernel.org> Cc: Theodore Ts'o <tytso@....edu> Subject: [PATCH] ext4: refuse O_DIRECT opens for mode where DIO doesn't work Certain ext4 modes (encryption, data=journal, inline data) cause Direct I/O to be a no-op. Instead of making DIO fail silently, make the open with the O_DIRECT flag fail with EINVAL. This will avoid surprises to application programs, and also signal to xfstests not to try O_DIRECT tests for file system modes where it doesn't work (and could result in test failures). Signed-off-by: Theodore Ts'o <tytso@....edu> --- fs/ext4/file.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/fs/ext4/file.c b/fs/ext4/file.c index fa2208b..4113676 100644 --- a/fs/ext4/file.c +++ b/fs/ext4/file.c @@ -372,7 +372,12 @@ static int ext4_file_open(struct inode * inode, struct file * filp) return -EACCES; if (ext4_encryption_info(inode) == NULL) return -ENOKEY; + if (filp->f_flags & O_DIRECT) + return -EINVAL; } + if ((ext4_should_journal_data(inode) || ext4_has_inline_data(inode)) && + (filp->f_flags & O_DIRECT)) + return -EINVAL; dir = dget_parent(file_dentry(filp)); if (ext4_encrypted_inode(d_inode(dir)) && -- 2.5.0 -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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