In preparation for adding coordination between truncate operations and
busy dax-pages, extend xfs_break_layouts() to assume it must be called
with the mmap lock held. This locking scheme will be required for
coordinating the break of 'dax layouts' (non-idle dax (ZONE_DEVICE)
pages mapped into the file's address space).
Cc: "Darrick J. Wong" <darrick.wong@xxxxxxxxxx>
Cc: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Cc: Dave Chinner <david@xxxxxxxxxxxxx>
Suggested-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
---
fs/xfs/xfs_file.c | 14 +++++++++-----
fs/xfs/xfs_ioctl.c | 5 +----
fs/xfs/xfs_iops.c | 10 +++++++---
fs/xfs/xfs_pnfs.c | 6 ++++--
4 files changed, 21 insertions(+), 14 deletions(-)
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 9ea08326f876..ba969019bf26 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -350,9 +350,16 @@ xfs_file_aio_write_checks(
if (error <= 0)
return error;
+ xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
+ *iolock |= XFS_MMAPLOCK_EXCL;
error = xfs_break_layouts(inode, iolock);
- if (error)
+ if (error) {
+ *iolock &= ~XFS_MMAPLOCK_EXCL;
+ xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
return error;
+ }
+ xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
+ *iolock &= ~XFS_MMAPLOCK_EXCL;
/*
* For changing security info in file_remove_privs() we need i_rwsem
@@ -768,7 +775,7 @@ xfs_file_fallocate(
struct xfs_inode *ip = XFS_I(inode);
long error;
enum xfs_prealloc_flags flags = 0;
- uint iolock = XFS_IOLOCK_EXCL;
+ uint iolock = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
loff_t new_size = 0;
bool do_file_insert = false;
@@ -782,9 +789,6 @@ xfs_file_fallocate(
if (error)
goto out_unlock;
- xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
- iolock |= XFS_MMAPLOCK_EXCL;
-
if (mode & FALLOC_FL_PUNCH_HOLE) {
error = xfs_free_file_space(ip, offset, len);
if (error)
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 89fb1eb80aae..4151fade4bb1 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -614,7 +614,7 @@ xfs_ioc_space(
struct xfs_inode *ip = XFS_I(inode);
struct iattr iattr;
enum xfs_prealloc_flags flags = 0;
- uint iolock = XFS_IOLOCK_EXCL;
+ uint iolock = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
int error;
/*
@@ -648,9 +648,6 @@ xfs_ioc_space(
if (error)
goto out_unlock;
- xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
- iolock |= XFS_MMAPLOCK_EXCL;
-
switch (bf->l_whence) {
case 0: /*SEEK_SET*/
break;
diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index 951e84df5576..d23aa08426f9 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -1028,13 +1028,17 @@ xfs_vn_setattr(
if (iattr->ia_valid & ATTR_SIZE) {
struct xfs_inode *ip = XFS_I(d_inode(dentry));
- uint iolock = XFS_IOLOCK_EXCL;
+ uint iolock;
+
+ xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
+ iolock = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
error = xfs_break_layouts(d_inode(dentry), &iolock);
- if (error)
+ if (error) {
+ xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
return error;
+ }
- xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
error = xfs_vn_setattr_size(dentry, iattr);
xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
} else {
diff --git a/fs/xfs/xfs_pnfs.c b/fs/xfs/xfs_pnfs.c
index aa6c5c193f45..9fe661c2d59c 100644
--- a/fs/xfs/xfs_pnfs.c
+++ b/fs/xfs/xfs_pnfs.c
@@ -38,12 +38,14 @@ xfs_break_layouts(
struct xfs_inode *ip = XFS_I(inode);
int error;
- ASSERT(xfs_isilocked(ip, XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL));
+ ASSERT(xfs_isilocked(ip, XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL
+ | XFS_MMAPLOCK_EXCL));
while ((error = break_layout(inode, false) == -EWOULDBLOCK)) {
xfs_iunlock(ip, *iolock);
error = break_layout(inode, true);
- *iolock = XFS_IOLOCK_EXCL;
+ *iolock &= ~XFS_IOLOCK_SHARED;
+ *iolock |= XFS_IOLOCK_EXCL;
xfs_ilock(ip, *iolock);
}
--
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