Among the FUSE_INIT phase, server/client shall negotiate if supporting
per-file DAX.
Requirements for server:
- capable of handling SETFLAGS/FSSETXATTR ioctl and storing
FS_DAX_FL/FS_XFLAG_DAX persistently.
- set FUSE_ATTR_DAX if the file capable of per-file DAX when replying
FUSE_LOOKUP request accordingly.
Requirements for client:
- capable of handling per-file DAX when receiving FUSE_ATTR_DAX.
Signed-off-by: Jeffle Xu <jefflexu@xxxxxxxxxxxxxxxxx>
---
fs/fuse/fuse_i.h | 3 +++
fs/fuse/inode.c | 12 ++++++++----
2 files changed, 11 insertions(+), 4 deletions(-)
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index a23dd8d0c181..0b21e76a379a 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -770,6 +770,9 @@ struct fuse_conn {
/* Propagate syncfs() to server */
unsigned int sync_fs:1;
+ /* Does the filesystem support per-file DAX? */
+ unsigned int perfile_dax:1;
+
/** The number of requests waiting for completion */
atomic_t num_waiting;
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 0bc0d8af81e1..9d302079281c 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -1087,10 +1087,12 @@ static void process_init_reply(struct fuse_mount *fm, struct fuse_args *args,
min_t(unsigned int, fc->max_pages_limit,
max_t(unsigned int, arg->max_pages, 1));
}
- if (IS_ENABLED(CONFIG_FUSE_DAX) &&
- arg->flags & FUSE_MAP_ALIGNMENT &&
- !fuse_dax_check_alignment(fc, arg->map_alignment)) {
- ok = false;
+ if (IS_ENABLED(CONFIG_FUSE_DAX)) {
+ if (arg->flags & FUSE_MAP_ALIGNMENT &&
+ !fuse_dax_check_alignment(fc, arg->map_alignment))
+ ok = false;
+ if (arg->flags & FUSE_PERFILE_DAX)
+ fc->perfile_dax = 1;
}
if (arg->flags & FUSE_HANDLE_KILLPRIV_V2) {
fc->handle_killpriv_v2 = 1;
@@ -1145,6 +1147,8 @@ void fuse_send_init(struct fuse_mount *fm)
#ifdef CONFIG_FUSE_DAX
if (fm->fc->dax)
ia->in.flags |= FUSE_MAP_ALIGNMENT;
+ if (fm->fc->dax_mode == FUSE_DAX_INODE)
+ ia->in.flags |= FUSE_PERFILE_DAX;
#endif
if (fm->fc->auto_submounts)
ia->in.flags |= FUSE_SUBMOUNTS;
--
2.27.0
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