dax_sem_{up,down}_write_sem() allow the ext2 dax semaphore to be
compiled out in the CONFIG_FS_DAX=n case. However there are still some
open coded uses of the semaphore. Add dax_sem_{up_read,down_read}() and
dax_sem_assert_held() helpers. Use them to convert all open-coded usages
of the semaphore to the helpers.
Cc: <stable@xxxxxxxxxxxxxxx>
Fixes: dee410792419 ("/dev/dax, core: file operations and dax-mmap")
Reviewed-by: Jan Kara <jack@xxxxxxx>
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
---
fs/ext2/ext2.h | 6 ++++++
fs/ext2/file.c | 5 ++---
fs/ext2/inode.c | 4 +---
3 files changed, 9 insertions(+), 6 deletions(-)
diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h
index 032295e1d386..203c31dfe549 100644
--- a/fs/ext2/ext2.h
+++ b/fs/ext2/ext2.h
@@ -711,9 +711,15 @@ struct ext2_inode_info {
#ifdef CONFIG_FS_DAX
#define dax_sem_down_write(ext2_inode) down_write(&(ext2_inode)->dax_sem)
#define dax_sem_up_write(ext2_inode) up_write(&(ext2_inode)->dax_sem)
+#define dax_sem_assert_held(ei) WARN_ON(!rwsem_is_locked(&(ei)->dax_sem))
+#define dax_sem_down_read(ext2_inode) down_read(&(ext2_inode)->dax_sem)
+#define dax_sem_up_read(ext2_inode) up_read(&(ext2_inode)->dax_sem)
#else
#define dax_sem_down_write(ext2_inode)
#define dax_sem_up_write(ext2_inode)
+#define dax_sem_assert_held(ext2_inode)
+#define dax_sem_down_read(ext2_inode)
+#define dax_sem_up_read(ext2_inode)
#endif
/*
diff --git a/fs/ext2/file.c b/fs/ext2/file.c
index 09640220fda8..1c7ea1bcddde 100644
--- a/fs/ext2/file.c
+++ b/fs/ext2/file.c
@@ -91,18 +91,17 @@ static ssize_t ext2_dax_write_iter(struct kiocb *iocb, struct iov_iter *from)
static int ext2_dax_fault(struct vm_fault *vmf)
{
struct inode *inode = file_inode(vmf->vma->vm_file);
- struct ext2_inode_info *ei = EXT2_I(inode);
int ret;
if (vmf->flags & FAULT_FLAG_WRITE) {
sb_start_pagefault(inode->i_sb);
file_update_time(vmf->vma->vm_file);
}
- down_read(&ei->dax_sem);
+ dax_sem_down_read(EXT2_I(inode));
ret = dax_iomap_fault(vmf, PE_SIZE_PTE, NULL, NULL, &ext2_iomap_ops);
- up_read(&ei->dax_sem);
+ dax_sem_up_read(EXT2_I(inode));
if (vmf->flags & FAULT_FLAG_WRITE)
sb_end_pagefault(inode->i_sb);
return ret;
diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index 9b2ac55ac34f..4783db0e4873 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -1187,9 +1187,7 @@ static void __ext2_truncate_blocks(struct inode *inode, loff_t offset)
blocksize = inode->i_sb->s_blocksize;
iblock = (offset + blocksize-1) >> EXT2_BLOCK_SIZE_BITS(inode->i_sb);
-#ifdef CONFIG_FS_DAX
- WARN_ON(!rwsem_is_locked(&ei->dax_sem));
-#endif
+ dax_sem_assert_held(ei);
n = ext2_block_to_path(inode, iblock, offsets, NULL);
if (n == 0)