Print the path name of the swapfile that failed to active to ease
debugging the problem and to avoid a scare if xfstests hits these
cases. Also reword one warning a bit, as the error is not about
a file being on multiple devices, but one that has at least an
extent outside the main device known to the VFS and swap code.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
fs/iomap/swapfile.c | 38 ++++++++++++++++++++++----------------
1 file changed, 22 insertions(+), 16 deletions(-)
diff --git a/fs/iomap/swapfile.c b/fs/iomap/swapfile.c
index a648dbf6991e4e..1dc63beae0c5b8 100644
--- a/fs/iomap/swapfile.c
+++ b/fs/iomap/swapfile.c
@@ -18,6 +18,7 @@ struct iomap_swapfile_info {
uint64_t highest_ppage; /* highest physical addr seen (pages) */
unsigned long nr_pages; /* number of pages collected */
int nr_extents; /* extent count */
+ struct file *file;
};
/*
@@ -70,6 +71,18 @@ static int iomap_swapfile_add_extent(struct iomap_swapfile_info *isi)
return 0;
}
+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);
+ return -EINVAL;
+}
+
/*
* Accumulate iomaps for this swap file. We have to accumulate iomaps because
* swap only cares about contiguous page-aligned physical extents and makes no
@@ -89,28 +102,20 @@ static loff_t iomap_swapfile_activate_actor(struct inode *inode, loff_t pos,
break;
case IOMAP_INLINE:
/* No inline data. */
- pr_err("swapon: file is inline\n");
- return -EINVAL;
+ return iomap_swapfile_fail(isi, "is inline");
default:
- pr_err("swapon: file has unallocated extents\n");
- return -EINVAL;
+ return iomap_swapfile_fail(isi, "has unallocated extents");
}
/* No uncommitted metadata or shared blocks. */
- if (iomap->flags & IOMAP_F_DIRTY) {
- pr_err("swapon: file is not committed\n");
- return -EINVAL;
- }
- if (iomap->flags & IOMAP_F_SHARED) {
- pr_err("swapon: file has shared extents\n");
- return -EINVAL;
- }
+ if (iomap->flags & IOMAP_F_DIRTY)
+ return iomap_swapfile_fail(isi, "is not committed");
+ if (iomap->flags & IOMAP_F_SHARED)
+ return iomap_swapfile_fail(isi, "has shared extents");
/* Only one bdev per swap file. */
- if (iomap->bdev != isi->sis->bdev) {
- pr_err("swapon: file is on multiple devices\n");
- return -EINVAL;
- }
+ if (iomap->bdev != isi->sis->bdev)
+ return iomap_swapfile_fail(isi, "outside the main device");
if (isi->iomap.length == 0) {
/* No accumulated extent, so just store it. */
@@ -139,6 +144,7 @@ int iomap_swapfile_activate(struct swap_info_struct *sis,
struct iomap_swapfile_info isi = {
.sis = sis,
.lowest_ppage = (sector_t)-1ULL,
+ .file = swap_file,
};
struct address_space *mapping = swap_file->f_mapping;
struct inode *inode = mapping->host;
--
2.30.1
