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Date: Fri, 23 Feb 2018 16:43:27 -0800
From: Dan Williams <dan.j.williams@...el.com>
To: linux-nvdimm@...ts.01.org
Cc: "Darrick J. Wong" <darrick.wong@...cle.com>,
linux-kernel@...r.kernel.org, stable@...r.kernel.org,
linux-xfs@...r.kernel.org, linux-mm@...ck.org,
linux-fsdevel@...r.kernel.org,
kbuild test robot <fengguang.wu@...el.com>
Subject: [PATCH v3 3/6] xfs, dax: introduce IS_FSDAX()
Given that S_DAX is non-zero in the FS_DAX=n + DEV_DAX=y case, another
mechanism besides the plain IS_DAX() check to compile out dead
filesystem-dax code paths. Without IS_FSDAX() xfs will fail at link time
with:
ERROR: "dax_finish_sync_fault" [fs/xfs/xfs.ko] undefined!
ERROR: "dax_iomap_fault" [fs/xfs/xfs.ko] undefined!
ERROR: "dax_iomap_rw" [fs/xfs/xfs.ko] undefined!
This compile failure was previously hidden by the fact that S_DAX was
erroneously defined to '0' in the FS_DAX=n + DEV_DAX=y case.
Cc: "Darrick J. Wong" <darrick.wong@...cle.com>
Cc: linux-xfs@...r.kernel.org
Cc: <stable@...r.kernel.org>
Reported-by: kbuild test robot <fengguang.wu@...el.com>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
---
fs/xfs/xfs_file.c | 14 +++++++-------
fs/xfs/xfs_ioctl.c | 4 ++--
fs/xfs/xfs_iomap.c | 6 +++---
fs/xfs/xfs_reflink.c | 2 +-
include/linux/fs.h | 2 ++
5 files changed, 15 insertions(+), 13 deletions(-)
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 9ea08326f876..46a098b90fd0 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -288,7 +288,7 @@ xfs_file_read_iter(
if (XFS_FORCED_SHUTDOWN(mp))
return -EIO;
- if (IS_DAX(inode))
+ if (IS_FSDAX(inode))
ret = xfs_file_dax_read(iocb, to);
else if (iocb->ki_flags & IOCB_DIRECT)
ret = xfs_file_dio_aio_read(iocb, to);
@@ -726,7 +726,7 @@ xfs_file_write_iter(
if (XFS_FORCED_SHUTDOWN(ip->i_mount))
return -EIO;
- if (IS_DAX(inode))
+ if (IS_FSDAX(inode))
ret = xfs_file_dax_write(iocb, from);
else if (iocb->ki_flags & IOCB_DIRECT) {
/*
@@ -1045,7 +1045,7 @@ __xfs_filemap_fault(
}
xfs_ilock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
- if (IS_DAX(inode)) {
+ if (IS_FSDAX(inode)) {
pfn_t pfn;
ret = dax_iomap_fault(vmf, pe_size, &pfn, NULL, &xfs_iomap_ops);
@@ -1070,7 +1070,7 @@ xfs_filemap_fault(
{
/* DAX can shortcut the normal fault path on write faults! */
return __xfs_filemap_fault(vmf, PE_SIZE_PTE,
- IS_DAX(file_inode(vmf->vma->vm_file)) &&
+ IS_FSDAX(file_inode(vmf->vma->vm_file)) &&
(vmf->flags & FAULT_FLAG_WRITE));
}
@@ -1079,7 +1079,7 @@ xfs_filemap_huge_fault(
struct vm_fault *vmf,
enum page_entry_size pe_size)
{
- if (!IS_DAX(file_inode(vmf->vma->vm_file)))
+ if (!IS_FSDAX(file_inode(vmf->vma->vm_file)))
return VM_FAULT_FALLBACK;
/* DAX can shortcut the normal fault path on write faults! */
@@ -1124,12 +1124,12 @@ xfs_file_mmap(
* We don't support synchronous mappings for non-DAX files. At least
* until someone comes with a sensible use case.
*/
- if (!IS_DAX(file_inode(filp)) && (vma->vm_flags & VM_SYNC))
+ if (!IS_FSDAX(file_inode(filp)) && (vma->vm_flags & VM_SYNC))
return -EOPNOTSUPP;
file_accessed(filp);
vma->vm_ops = &xfs_file_vm_ops;
- if (IS_DAX(file_inode(filp)))
+ if (IS_FSDAX(file_inode(filp)))
vma->vm_flags |= VM_MIXEDMAP | VM_HUGEPAGE;
return 0;
}
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 89fb1eb80aae..234279ff66ce 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -1108,9 +1108,9 @@ xfs_ioctl_setattr_dax_invalidate(
}
/* If the DAX state is not changing, we have nothing to do here. */
- if ((fa->fsx_xflags & FS_XFLAG_DAX) && IS_DAX(inode))
+ if ((fa->fsx_xflags & FS_XFLAG_DAX) && IS_FSDAX(inode))
return 0;
- if (!(fa->fsx_xflags & FS_XFLAG_DAX) && !IS_DAX(inode))
+ if (!(fa->fsx_xflags & FS_XFLAG_DAX) && !IS_FSDAX(inode))
return 0;
/* lock, flush and invalidate mapping in preparation for flag change */
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index 66e1edbfb2b2..cf794d429aec 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -241,7 +241,7 @@ xfs_iomap_write_direct(
* the reserve block pool for bmbt block allocation if there is no space
* left but we need to do unwritten extent conversion.
*/
- if (IS_DAX(VFS_I(ip))) {
+ if (IS_FSDAX(VFS_I(ip))) {
bmapi_flags = XFS_BMAPI_CONVERT | XFS_BMAPI_ZERO;
if (imap->br_state == XFS_EXT_UNWRITTEN) {
tflags |= XFS_TRANS_RESERVE;
@@ -952,7 +952,7 @@ static inline bool imap_needs_alloc(struct inode *inode,
return !nimaps ||
imap->br_startblock == HOLESTARTBLOCK ||
imap->br_startblock == DELAYSTARTBLOCK ||
- (IS_DAX(inode) && imap->br_state == XFS_EXT_UNWRITTEN);
+ (IS_FSDAX(inode) && imap->br_state == XFS_EXT_UNWRITTEN);
}
static inline bool need_excl_ilock(struct xfs_inode *ip, unsigned flags)
@@ -988,7 +988,7 @@ xfs_file_iomap_begin(
return -EIO;
if (((flags & (IOMAP_WRITE | IOMAP_DIRECT)) == IOMAP_WRITE) &&
- !IS_DAX(inode) && !xfs_get_extsz_hint(ip)) {
+ !IS_FSDAX(inode) && !xfs_get_extsz_hint(ip)) {
/* Reserve delalloc blocks for regular writeback. */
return xfs_file_iomap_begin_delay(inode, offset, length, iomap);
}
diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
index 270246943a06..a126e00e05e3 100644
--- a/fs/xfs/xfs_reflink.c
+++ b/fs/xfs/xfs_reflink.c
@@ -1351,7 +1351,7 @@ xfs_reflink_remap_range(
goto out_unlock;
/* Don't share DAX file data for now. */
- if (IS_DAX(inode_in) || IS_DAX(inode_out))
+ if (IS_FSDAX(inode_in) || IS_FSDAX(inode_out))
goto out_unlock;
ret = vfs_clone_file_prep_inodes(inode_in, pos_in, inode_out, pos_out,
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 79c413985305..a4310a95011b 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1909,6 +1909,8 @@ static inline bool sb_rdonly(const struct super_block *sb) { return sb->s_flags
#define IS_WHITEOUT(inode) (S_ISCHR(inode->i_mode) && \
(inode)->i_rdev == WHITEOUT_DEV)
+#define IS_FSDAX(inode) (IS_ENABLED(CONFIG_FS_DAX) && IS_DAX(inode))
+
static inline bool HAS_UNMAPPED_ID(struct inode *inode)
{
return !uid_valid(inode->i_uid) || !gid_valid(inode->i_gid);
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