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Linux 5.12 compat: idmapped mounts

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In Linux 5.12, the filesystem API was modified to support ipmapped
mounts by adding a "struct user_namespace *" parameter to a number
functions and VFS handlers. This change adds the needed autoconf
macros to detect the new interfaces and updates the code appropriately.
This change does not add support for idmapped mounts, instead it
preserves the existing behavior by passing the initial user namespace
where needed.  A subsequent commit will be required to add support
for idmapped mounted.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Co-authored-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Coleman Kane <ckane@colemankane.org>
Closes #11712
This commit is contained in:
Coleman Kane
2021-03-20 00:00:59 -04:00
committed by GitHub
parent 330c6c0523
commit e2a8296131
22 changed files with 557 additions and 123 deletions
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module/os/linux/zfs/zpl_inode.c
+45 -4
View File
@@ -128,7 +128,12 @@ zpl_vap_init(vattr_t *vap, struct inode *dir, umode_t mode, cred_t *cr)
}
static int
#ifdef HAVE_IOPS_CREATE_USERNS
zpl_create(struct user_namespace *user_ns, struct inode *dir,
struct dentry *dentry, umode_t mode, bool flag)
#else
zpl_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool flag)
#endif
{
cred_t *cr = CRED();
znode_t *zp;
@@ -163,7 +168,12 @@ zpl_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool flag)
}
static int
#ifdef HAVE_IOPS_MKNOD_USERNS
zpl_mknod(struct user_namespace *user_ns, struct inode *dir,
struct dentry *dentry, umode_t mode,
#else
zpl_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
#endif
dev_t rdev)
{
cred_t *cr = CRED();
@@ -278,7 +288,12 @@ zpl_unlink(struct inode *dir, struct dentry *dentry)
}
static int
#ifdef HAVE_IOPS_MKDIR_USERNS
zpl_mkdir(struct user_namespace *user_ns, struct inode *dir,
struct dentry *dentry, umode_t mode)
#else
zpl_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
#endif
{
cred_t *cr = CRED();
vattr_t *vap;
@@ -338,8 +353,14 @@ zpl_rmdir(struct inode *dir, struct dentry *dentry)
}
static int
#ifdef HAVE_USERNS_IOPS_GETATTR
zpl_getattr_impl(struct user_namespace *user_ns,
const struct path *path, struct kstat *stat, u32 request_mask,
unsigned int query_flags)
#else
zpl_getattr_impl(const struct path *path, struct kstat *stat, u32 request_mask,
unsigned int query_flags)
#endif
{
int error;
fstrans_cookie_t cookie;
@@ -350,7 +371,11 @@ zpl_getattr_impl(const struct path *path, struct kstat *stat, u32 request_mask,
* XXX request_mask and query_flags currently ignored.
*/
error = -zfs_getattr_fast(path->dentry->d_inode, stat);
#ifdef HAVE_USERNS_IOPS_GETATTR
error = -zfs_getattr_fast(user_ns, path->dentry->d_inode, stat);
#else
error = -zfs_getattr_fast(kcred->user_ns, path->dentry->d_inode, stat);
#endif
spl_fstrans_unmark(cookie);
ASSERT3S(error, <=, 0);
@@ -359,7 +384,12 @@ zpl_getattr_impl(const struct path *path, struct kstat *stat, u32 request_mask,
ZPL_GETATTR_WRAPPER(zpl_getattr);
static int
#ifdef HAVE_SETATTR_PREPARE_USERNS
zpl_setattr(struct user_namespace *user_ns, struct dentry *dentry,
struct iattr *ia)
#else
zpl_setattr(struct dentry *dentry, struct iattr *ia)
#endif
{
struct inode *ip = dentry->d_inode;
cred_t *cr = CRED();
@@ -367,7 +397,7 @@ zpl_setattr(struct dentry *dentry, struct iattr *ia)
int error;
fstrans_cookie_t cookie;
error = setattr_prepare(dentry, ia);
error = zpl_setattr_prepare(kcred->user_ns, dentry, ia);
if (error)
return (error);
@@ -399,8 +429,14 @@ zpl_setattr(struct dentry *dentry, struct iattr *ia)
}
static int
#ifdef HAVE_IOPS_RENAME_USERNS
zpl_rename2(struct user_namespace *user_ns, struct inode *sdip,
struct dentry *sdentry, struct inode *tdip, struct dentry *tdentry,
unsigned int flags)
#else
zpl_rename2(struct inode *sdip, struct dentry *sdentry,
struct inode *tdip, struct dentry *tdentry, unsigned int flags)
#endif
{
cred_t *cr = CRED();
int error;
@@ -421,7 +457,7 @@ zpl_rename2(struct inode *sdip, struct dentry *sdentry,
return (error);
}
#ifndef HAVE_RENAME_WANTS_FLAGS
#if !defined(HAVE_RENAME_WANTS_FLAGS) && !defined(HAVE_IOPS_RENAME_USERNS)
static int
zpl_rename(struct inode *sdip, struct dentry *sdentry,
struct inode *tdip, struct dentry *tdentry)
@@ -431,7 +467,12 @@ zpl_rename(struct inode *sdip, struct dentry *sdentry,
#endif
static int
#ifdef HAVE_IOPS_SYMLINK_USERNS
zpl_symlink(struct user_namespace *user_ns, struct inode *dir,
struct dentry *dentry, const char *name)
#else
zpl_symlink(struct inode *dir, struct dentry *dentry, const char *name)
#endif
{
cred_t *cr = CRED();
vattr_t *vap;
@@ -678,7 +719,7 @@ const struct inode_operations zpl_dir_inode_operations = {
.mkdir = zpl_mkdir,
.rmdir = zpl_rmdir,
.mknod = zpl_mknod,
#ifdef HAVE_RENAME_WANTS_FLAGS
#if defined(HAVE_RENAME_WANTS_FLAGS) || defined(HAVE_IOPS_RENAME_USERNS)
.rename = zpl_rename2,
#else
.rename = zpl_rename,