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authorOmar Sandoval <osandov@fb.com>2018-05-16 11:13:34 -0700
committerDarrick J. Wong <darrick.wong@oracle.com>2018-05-16 11:13:34 -0700
commitec601924df0f8fc4f66ac04eaa6bccde87b2f569 (patch)
treed76095559d4e0ed673eaee92e9b9da096e5a774f
parentf7664b31975bd893190708e76b2c424328f0c49b (diff)
iomap: provide more useful errors for invalid swap files
Currently, for an invalid swap file, we print the same error message regardless of the reason. This isn't very useful for an admin, who will likely want to know why exactly they can't use their swap file. So, let's add specific error messages for each reason, and also move the bdev check after the flags checks, since the latter are more fundamental. Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Omar Sandoval <osandov@fb.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
-rw-r--r--fs/iomap.c40
1 files changed, 24 insertions, 16 deletions
diff --git a/fs/iomap.c b/fs/iomap.c
index d193390a1c20..89517442e296 100644
--- a/fs/iomap.c
+++ b/fs/iomap.c
@@ -1214,26 +1214,37 @@ static loff_t iomap_swapfile_activate_actor(struct inode *inode, loff_t pos,
struct iomap_swapfile_info *isi = data;
int error;
+ /* No inline data. */
+ if (iomap->flags & IOMAP_F_DATA_INLINE) {
+ pr_err("swapon: file is inline\n");
+ return -EINVAL;
+ }
+
/* Skip holes. */
if (iomap->type == IOMAP_HOLE)
goto out;
- /* Only one bdev per swap file. */
- if (iomap->bdev != isi->sis->bdev)
- goto err;
-
/* Only real or unwritten extents. */
- if (iomap->type != IOMAP_MAPPED && iomap->type != IOMAP_UNWRITTEN)
- goto err;
+ if (iomap->type != IOMAP_MAPPED && iomap->type != IOMAP_UNWRITTEN) {
+ pr_err("swapon: file has unallocated extents\n");
+ return -EINVAL;
+ }
- /* No uncommitted metadata or shared blocks or inline data. */
- if (iomap->flags & (IOMAP_F_DIRTY | IOMAP_F_SHARED |
- IOMAP_F_DATA_INLINE))
- goto err;
+ /* 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;
+ }
- /* No null physical addresses. */
- if (iomap->addr == IOMAP_NULL_ADDR)
- goto err;
+ /* Only one bdev per swap file. */
+ if (iomap->bdev != isi->sis->bdev) {
+ pr_err("swapon: file is on multiple devices\n");
+ return -EINVAL;
+ }
if (isi->iomap.length == 0) {
/* No accumulated extent, so just store it. */
@@ -1250,9 +1261,6 @@ static loff_t iomap_swapfile_activate_actor(struct inode *inode, loff_t pos,
}
out:
return count;
-err:
- pr_err("swapon: file cannot be used for swap\n");
- return -EINVAL;
}
/*