[Virtio-fs] [PATCH v5 2/3] virtiofsd: Track submounts
Greg Kurz
groug at kaod.org
Mon Feb 14 13:58:19 UTC 2022
If
Support for FUSE_SYNCFS requires the server to track submounts
that may exist under the shared directory. lo_do_lookup() already knows
how to detect them : it is a directory with a different device ID or
mount ID than its parent. Use the same logic and record the information
under the lo_inode structure.
Signed-off-by: Greg Kurz <groug at kaod.org>
---
tools/virtiofsd/passthrough_ll.c | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)
diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough_ll.c
index 2bf5d40df531..e94c4e6f8635 100644
--- a/tools/virtiofsd/passthrough_ll.c
+++ b/tools/virtiofsd/passthrough_ll.c
@@ -118,6 +118,7 @@ struct lo_inode {
GHashTable *posix_locks; /* protected by lo_inode->plock_mutex */
mode_t filetype;
+ bool is_submount;
};
struct lo_cred {
@@ -1017,6 +1018,7 @@ static int lo_do_lookup(fuse_req_t req, fuse_ino_t parent, const char *name,
struct lo_data *lo = lo_data(req);
struct lo_inode *inode = NULL;
struct lo_inode *dir = lo_inode(req, parent);
+ bool is_submount;
if (inodep) {
*inodep = NULL; /* in case there is an error */
@@ -1051,8 +1053,10 @@ static int lo_do_lookup(fuse_req_t req, fuse_ino_t parent, const char *name,
goto out_err;
}
- if (S_ISDIR(e->attr.st_mode) && lo->announce_submounts &&
- (e->attr.st_dev != dir->key.dev || mnt_id != dir->key.mnt_id)) {
+ is_submount = S_ISDIR(e->attr.st_mode) &&
+ (e->attr.st_dev != dir->key.dev || mnt_id != dir->key.mnt_id);
+
+ if (is_submount && lo->announce_submounts) {
e->attr_flags |= FUSE_ATTR_SUBMOUNT;
}
@@ -1079,6 +1083,7 @@ static int lo_do_lookup(fuse_req_t req, fuse_ino_t parent, const char *name,
inode->key.ino = e->attr.st_ino;
inode->key.dev = e->attr.st_dev;
inode->key.mnt_id = mnt_id;
+ inode->is_submount = is_submount;
if (lo->posix_lock) {
pthread_mutex_init(&inode->plock_mutex, NULL);
inode->posix_locks = g_hash_table_new_full(
@@ -1100,8 +1105,9 @@ static int lo_do_lookup(fuse_req_t req, fuse_ino_t parent, const char *name,
lo_inode_put(lo, &dir);
- fuse_log(FUSE_LOG_DEBUG, " %lli/%s -> %lli\n", (unsigned long long)parent,
- name, (unsigned long long)e->ino);
+ fuse_log(FUSE_LOG_DEBUG, " %lli/%s -> %lli%s\n",
+ (unsigned long long) parent, name, (unsigned long long) e->ino,
+ is_submount ? " (submount)" : "");
return 0;
--
2.34.1
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