Add one flag for fuse_attr.flags indicating if DAX shall be enabled for
this file.
When the per-file DAX flag changes for an *opened* file, the state of
the file won't be updated until this file is closed and reopened later.
Currently it is not implemented yet to change per-file DAX flag inside
guest kernel, e.g., by chattr(1).
Signed-off-by: Jeffle Xu <jefflexu@xxxxxxxxxxxxxxxxx>
---
fs/fuse/dax.c | 28 ++++++++++++++++++++++++----
fs/fuse/file.c | 4 ++--
fs/fuse/fuse_i.h | 5 +++--
fs/fuse/inode.c | 4 +++-
include/uapi/linux/fuse.h | 5 +++++
5 files changed, 37 insertions(+), 9 deletions(-)
diff --git a/fs/fuse/dax.c b/fs/fuse/dax.c
index 4873d764cb66..ed5a430364bb 100644
--- a/fs/fuse/dax.c
+++ b/fs/fuse/dax.c
@@ -1341,7 +1341,7 @@ static const struct address_space_operations fuse_dax_file_aops = {
.invalidatepage = noop_invalidatepage,
};
-static bool fuse_should_enable_dax(struct inode *inode)
+static bool fuse_should_enable_dax(struct inode *inode, unsigned int flags)
{
struct fuse_conn *fc = get_fuse_conn(inode);
unsigned int mode;
@@ -1354,18 +1354,38 @@ static bool fuse_should_enable_dax(struct inode *inode)
if (mode == FUSE_DAX_MOUNT_NEVER)
return false;
- return true;
+ if (mode == FUSE_DAX_MOUNT_ALWAYS)
+ return true;
+
+ WARN_ON(mode != FUSE_DAX_MOUNT_INODE);
+ return flags & FUSE_ATTR_DAX;
}
-void fuse_dax_inode_init(struct inode *inode)
+void fuse_dax_inode_init(struct inode *inode, unsigned int flags)
{
- if (!fuse_should_enable_dax(inode))
+ if (!fuse_should_enable_dax(inode, flags))
return;
inode->i_flags |= S_DAX;
inode->i_data.a_ops = &fuse_dax_file_aops;
}
+void fuse_update_dax(struct inode *inode, unsigned int flags)
+{
+ bool oldstate, newstate;
+ struct fuse_conn *fc = get_fuse_conn(inode);
+
+ if (!IS_ENABLED(CONFIG_FUSE_DAX) || !fc->dax ||
+ fc->dax->mode != FUSE_DAX_MOUNT_INODE)
+ return;
+
+ oldstate = IS_DAX(inode);
+ newstate = flags & FUSE_ATTR_DAX;
+
+ if (oldstate != newstate)
+ d_mark_dontcache(inode);
+}
+
bool fuse_dax_check_alignment(struct fuse_conn *fc, unsigned int map_alignment)
{
if (fc->dax && (map_alignment > FUSE_DAX_SHIFT)) {
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 97f860cfc195..cf42af492146 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -3142,7 +3142,7 @@ static const struct address_space_operations fuse_file_aops = {
.write_end = fuse_write_end,
};
-void fuse_init_file_inode(struct inode *inode)
+void fuse_init_file_inode(struct inode *inode, struct fuse_attr *attr)
{
struct fuse_inode *fi = get_fuse_inode(inode);
@@ -3156,5 +3156,5 @@ void fuse_init_file_inode(struct inode *inode)
fi->writepages = RB_ROOT;
if (IS_ENABLED(CONFIG_FUSE_DAX))
- fuse_dax_inode_init(inode);
+ fuse_dax_inode_init(inode, attr->flags);
}
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index f29018323845..b0ecfffd0c7d 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -1000,7 +1000,7 @@ int fuse_notify_poll_wakeup(struct fuse_conn *fc,
/**
* Initialize file operations on a regular file
*/
-void fuse_init_file_inode(struct inode *inode);
+void fuse_init_file_inode(struct inode *inode, struct fuse_attr *attr);
/**
* Initialize inode operations on regular files and special files
@@ -1252,8 +1252,9 @@ int fuse_dax_conn_alloc(struct fuse_conn *fc, unsigned int mode,
struct dax_device *dax_dev);
void fuse_dax_conn_free(struct fuse_conn *fc);
bool fuse_dax_inode_alloc(struct super_block *sb, struct fuse_inode *fi);
-void fuse_dax_inode_init(struct inode *inode);
+void fuse_dax_inode_init(struct inode *inode, unsigned int flags);
void fuse_dax_inode_cleanup(struct inode *inode);
+void fuse_update_dax(struct inode *inode, unsigned int flags);
bool fuse_dax_check_alignment(struct fuse_conn *fc, unsigned int map_alignment);
void fuse_dax_cancel_work(struct fuse_conn *fc);
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index f6b46395edb2..47ebb1a394d2 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -269,6 +269,8 @@ void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
if (inval)
invalidate_inode_pages2(inode->i_mapping);
}
+
+ fuse_update_dax(inode, attr->flags);
}
static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr)
@@ -281,7 +283,7 @@ static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr)
inode->i_ctime.tv_nsec = attr->ctimensec;
if (S_ISREG(inode->i_mode)) {
fuse_init_common(inode);
- fuse_init_file_inode(inode);
+ fuse_init_file_inode(inode, attr);
} else if (S_ISDIR(inode->i_mode))
fuse_init_dir(inode);
else if (S_ISLNK(inode->i_mode))
diff --git a/include/uapi/linux/fuse.h b/include/uapi/linux/fuse.h
index 36ed092227fa..9ee088ddbe2a 100644
--- a/include/uapi/linux/fuse.h
+++ b/include/uapi/linux/fuse.h
@@ -184,6 +184,9 @@
*
* 7.34
* - add FUSE_SYNCFS
+ *
+ * 7.35
+ * - add FUSE_ATTR_DAX
*/
#ifndef _LINUX_FUSE_H
@@ -449,8 +452,10 @@ struct fuse_file_lock {
* fuse_attr flags
*
* FUSE_ATTR_SUBMOUNT: Object is a submount root
+ * FUSE_ATTR_DAX: Enable DAX for this file in per-file DAX mode
*/
#define FUSE_ATTR_SUBMOUNT (1 << 0)
+#define FUSE_ATTR_DAX (1 << 1)
/**
* Open flags
--
2.27.0
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