[PATCH RFC 07/13] iomap: simplify iomap_swapfile_fail() with '%pD' specifier

From: Jia He
Date: Wed Jul 14 2021 - 23:16:29 EST


After the behavior of '%pD' is change to print the full path of file,
iomap_swapfile_fail() can be simplified.

Given the space with proper length would be allocated in vprintk_store(),
the kmalloc() is not required any more.

Besides, the previous number postfix of '%pD' in format string is
pointless.

Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: "Darrick J. Wong" <djwong@xxxxxxxxxx>
Cc: linux-xfs@xxxxxxxxxxxxxxx
Cc: linux-fsdevel@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Suggested-by: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Signed-off-by: Jia He <justin.he@xxxxxxx>
---
fs/iomap/direct-io.c | 2 +-
fs/iomap/swapfile.c | 8 +-------
2 files changed, 2 insertions(+), 8 deletions(-)

diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c
index 9398b8c31323..e876a5f9d888 100644
--- a/fs/iomap/direct-io.c
+++ b/fs/iomap/direct-io.c
@@ -426,7 +426,7 @@ iomap_dio_actor(struct inode *inode, loff_t pos, loff_t length,
* iomap_apply() call in the DIO path, then it will see the
* DELALLOC block that the page-mkwrite allocated.
*/
- pr_warn_ratelimited("Direct I/O collision with buffered writes! File: %pD4 Comm: %.20s\n",
+ pr_warn_ratelimited("Direct I/O collision with buffered writes! File: %pD Comm: %.20s\n",
dio->iocb->ki_filp, current->comm);
return -EIO;
default:
diff --git a/fs/iomap/swapfile.c b/fs/iomap/swapfile.c
index 6250ca6a1f85..17032c14e466 100644
--- a/fs/iomap/swapfile.c
+++ b/fs/iomap/swapfile.c
@@ -73,13 +73,7 @@ static int iomap_swapfile_add_extent(struct iomap_swapfile_info *isi)

static int iomap_swapfile_fail(struct iomap_swapfile_info *isi, const char *str)
{
- char *buf, *p = ERR_PTR(-ENOMEM);
-
- buf = kmalloc(PATH_MAX, GFP_KERNEL);
- if (buf)
- p = file_path(isi->file, buf, PATH_MAX);
- pr_err("swapon: file %s %s\n", IS_ERR(p) ? "<unknown>" : p, str);
- kfree(buf);
+ pr_err("swapon: file %pD %s\n", isi->file, str);
return -EINVAL;
}

--
2.17.1