[PATCH 15/18] ext4: Simplify error handling in ext4_dax_huge_fault()
From: Jan Kara <hidden>
Date: 2017-11-01 15:36:44
Also in:
linux-api, linux-fsdevel, linux-mm, linux-xfs, nvdimm
Subsystem:
ext4 file system, filesystems (vfs and infrastructure), the rest · Maintainers:
"Theodore Ts'o", Alexander Viro, Christian Brauner, Linus Torvalds
If transaction starting fails, just bail out of the function immediately instead of checking for that condition throughout the function. Reviewed-by: Ross Zwisler <ross.zwisler-VuQAYsv1563Yd54FQh9/CA@public.gmane.org> Signed-off-by: Jan Kara <redacted> --- fs/ext4/file.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-)
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 3cec0b95672f..208adfc3e673 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c@@ -302,16 +302,17 @@ static int ext4_dax_huge_fault(struct vm_fault *vmf, down_read(&EXT4_I(inode)->i_mmap_sem); handle = ext4_journal_start_sb(sb, EXT4_HT_WRITE_PAGE, EXT4_DATA_TRANS_BLOCKS(sb)); + if (IS_ERR(handle)) { + up_read(&EXT4_I(inode)->i_mmap_sem); + sb_end_pagefault(sb); + return VM_FAULT_SIGBUS; + } } else { down_read(&EXT4_I(inode)->i_mmap_sem); } - if (!IS_ERR(handle)) - result = dax_iomap_fault(vmf, pe_size, NULL, &ext4_iomap_ops); - else - result = VM_FAULT_SIGBUS; + result = dax_iomap_fault(vmf, pe_size, NULL, &ext4_iomap_ops); if (write) { - if (!IS_ERR(handle)) - ext4_journal_stop(handle); + ext4_journal_stop(handle); up_read(&EXT4_I(inode)->i_mmap_sem); sb_end_pagefault(sb); } else {
--
2.12.3