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Message-Id: <20240815092429.103356-5-aleksandr.mikhalitsyn@canonical.com>
Date: Thu, 15 Aug 2024 11:24:21 +0200
From: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@...onical.com>
To: mszeredi@...hat.com
Cc: brauner@...nel.org,
stgraber@...raber.org,
linux-fsdevel@...r.kernel.org,
Seth Forshee <sforshee@...nel.org>,
Miklos Szeredi <miklos@...redi.hu>,
Amir Goldstein <amir73il@...il.com>,
Bernd Schubert <bschubert@....com>,
Alexander Mikhalitsyn <aleksandr.mikhalitsyn@...onical.com>,
linux-kernel@...r.kernel.org
Subject: [PATCH v3 04/11] fs/fuse: support idmapped getattr inode op
We have to:
- pass an idmapping to the generic_fillattr()
to properly handle UIG/GID mapping for the userspace.
- pass -/- to fuse_fillattr() (analog of generic_fillattr() in fuse).
Difference between these two is that generic_fillattr() takes all
the stat() data from the inode directly, while fuse_fillattr() codepath
takes a fresh data just from the userspace reply on the FUSE_GETATTR request.
In some cases we can just pass &nop_mnt_idmap, because idmapping won't
be used in these codepaths. For example, when 3rd argument of fuse_do_getattr()
is NULL then idmap argument is not used.
Cc: Christian Brauner <brauner@...nel.org>
Cc: Seth Forshee <sforshee@...nel.org>
Cc: Miklos Szeredi <miklos@...redi.hu>
Cc: Amir Goldstein <amir73il@...il.com>
Cc: Bernd Schubert <bschubert@....com>
Cc: <linux-fsdevel@...r.kernel.org>
Signed-off-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@...onical.com>
---
v2:
- pass idmap in more cases to make code easier to understand
---
fs/fuse/dir.c | 44 ++++++++++++++++++++++++--------------------
1 file changed, 24 insertions(+), 20 deletions(-)
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 1e45c6157af4..a5bf8c18a0ae 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -1157,18 +1157,22 @@ static int fuse_link(struct dentry *entry, struct inode *newdir,
return err;
}
-static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr,
- struct kstat *stat)
+static void fuse_fillattr(struct mnt_idmap *idmap, struct inode *inode,
+ struct fuse_attr *attr, struct kstat *stat)
{
unsigned int blkbits;
struct fuse_conn *fc = get_fuse_conn(inode);
+ vfsuid_t vfsuid = make_vfsuid(idmap, fc->user_ns,
+ make_kuid(fc->user_ns, attr->uid));
+ vfsgid_t vfsgid = make_vfsgid(idmap, fc->user_ns,
+ make_kgid(fc->user_ns, attr->gid));
stat->dev = inode->i_sb->s_dev;
stat->ino = attr->ino;
stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777);
stat->nlink = attr->nlink;
- stat->uid = make_kuid(fc->user_ns, attr->uid);
- stat->gid = make_kgid(fc->user_ns, attr->gid);
+ stat->uid = vfsuid_into_kuid(vfsuid);
+ stat->gid = vfsgid_into_kgid(vfsgid);
stat->rdev = inode->i_rdev;
stat->atime.tv_sec = attr->atime;
stat->atime.tv_nsec = attr->atimensec;
@@ -1207,8 +1211,8 @@ static void fuse_statx_to_attr(struct fuse_statx *sx, struct fuse_attr *attr)
attr->blksize = sx->blksize;
}
-static int fuse_do_statx(struct inode *inode, struct file *file,
- struct kstat *stat)
+static int fuse_do_statx(struct mnt_idmap *idmap, struct inode *inode,
+ struct file *file, struct kstat *stat)
{
int err;
struct fuse_attr attr;
@@ -1261,15 +1265,15 @@ static int fuse_do_statx(struct inode *inode, struct file *file,
stat->result_mask = sx->mask & (STATX_BASIC_STATS | STATX_BTIME);
stat->btime.tv_sec = sx->btime.tv_sec;
stat->btime.tv_nsec = min_t(u32, sx->btime.tv_nsec, NSEC_PER_SEC - 1);
- fuse_fillattr(inode, &attr, stat);
+ fuse_fillattr(idmap, inode, &attr, stat);
stat->result_mask |= STATX_TYPE;
}
return 0;
}
-static int fuse_do_getattr(struct inode *inode, struct kstat *stat,
- struct file *file)
+static int fuse_do_getattr(struct mnt_idmap *idmap, struct inode *inode,
+ struct kstat *stat, struct file *file)
{
int err;
struct fuse_getattr_in inarg;
@@ -1308,15 +1312,15 @@ static int fuse_do_getattr(struct inode *inode, struct kstat *stat,
ATTR_TIMEOUT(&outarg),
attr_version);
if (stat)
- fuse_fillattr(inode, &outarg.attr, stat);
+ fuse_fillattr(idmap, inode, &outarg.attr, stat);
}
}
return err;
}
-static int fuse_update_get_attr(struct inode *inode, struct file *file,
- struct kstat *stat, u32 request_mask,
- unsigned int flags)
+static int fuse_update_get_attr(struct mnt_idmap *idmap, struct inode *inode,
+ struct file *file, struct kstat *stat,
+ u32 request_mask, unsigned int flags)
{
struct fuse_inode *fi = get_fuse_inode(inode);
struct fuse_conn *fc = get_fuse_conn(inode);
@@ -1347,17 +1351,17 @@ static int fuse_update_get_attr(struct inode *inode, struct file *file,
forget_all_cached_acls(inode);
/* Try statx if BTIME is requested */
if (!fc->no_statx && (request_mask & ~STATX_BASIC_STATS)) {
- err = fuse_do_statx(inode, file, stat);
+ err = fuse_do_statx(idmap, inode, file, stat);
if (err == -ENOSYS) {
fc->no_statx = 1;
err = 0;
goto retry;
}
} else {
- err = fuse_do_getattr(inode, stat, file);
+ err = fuse_do_getattr(idmap, inode, stat, file);
}
} else if (stat) {
- generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
+ generic_fillattr(idmap, request_mask, inode, stat);
stat->mode = fi->orig_i_mode;
stat->ino = fi->orig_ino;
if (test_bit(FUSE_I_BTIME, &fi->state)) {
@@ -1371,7 +1375,7 @@ static int fuse_update_get_attr(struct inode *inode, struct file *file,
int fuse_update_attributes(struct inode *inode, struct file *file, u32 mask)
{
- return fuse_update_get_attr(inode, file, NULL, mask, 0);
+ return fuse_update_get_attr(&nop_mnt_idmap, inode, file, NULL, mask, 0);
}
int fuse_reverse_inval_entry(struct fuse_conn *fc, u64 parent_nodeid,
@@ -1515,7 +1519,7 @@ static int fuse_perm_getattr(struct inode *inode, int mask)
return -ECHILD;
forget_all_cached_acls(inode);
- return fuse_do_getattr(inode, NULL, NULL);
+ return fuse_do_getattr(&nop_mnt_idmap, inode, NULL, NULL);
}
/*
@@ -2094,7 +2098,7 @@ static int fuse_setattr(struct mnt_idmap *idmap, struct dentry *entry,
* ia_mode calculation may have used stale i_mode.
* Refresh and recalculate.
*/
- ret = fuse_do_getattr(inode, NULL, file);
+ ret = fuse_do_getattr(idmap, inode, NULL, file);
if (ret)
return ret;
@@ -2151,7 +2155,7 @@ static int fuse_getattr(struct mnt_idmap *idmap,
return -EACCES;
}
- return fuse_update_get_attr(inode, NULL, stat, request_mask, flags);
+ return fuse_update_get_attr(idmap, inode, NULL, stat, request_mask, flags);
}
static const struct inode_operations fuse_dir_inode_operations = {
--
2.34.1
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