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Remove definition checking on get_cred_rcu and can_umount functions to simplify path unloading logic in kernel Makefile.

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ShirkNeko
2025-04-11 03:46:21 +08:00
parent 6988b3d506
commit 610313d7d6
1 changed files with 0 additions and 54 deletions
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54
kernel/Makefile
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@@ -189,60 +189,6 @@ ifneq ($(shell grep -Eq "^int path_umount" $(srctree)/fs/internal.h; echo $$?),0
$(shell sed -i '/^extern void __init mnt_init/a int path_umount(struct path *path, int flags);' $(srctree)/fs/internal.h;)
endif
ifneq ($(shell grep -Eq "get_cred_rcu" $(srctree)/include/linux/cred.h; echo $$?),0)
GET_CRED_RCU = static inline const struct cred *get_cred_rcu(const struct cred *cred)\n\
{\n\t\
struct cred *nonconst_cred = (struct cred *) cred;\n\t\
if (!cred)\n\t\t\
return NULL;\n\t\
if (!atomic_inc_not_zero(&nonconst_cred->usage))\n\t\t\
return NULL;\n\t\
validate_creds(cred);\n\t\
return cred;\n\
}\n
$(shell sed -i '/^static inline void put_cred/i $(GET_CRED_RCU)' $(srctree)/include/linux/cred.h;)
endif
ifneq ($(shell grep -Eq "^static int can_umount" $(srctree)/fs/namespace.c; echo $$?),0)
CAN_UMOUNT = static int can_umount(const struct path *path, int flags)\n\
{\n\t\
struct mount *mnt = real_mount(path->mnt);\n\t\
if (flags & ~(MNT_FORCE | MNT_DETACH | MNT_EXPIRE | UMOUNT_NOFOLLOW))\n\t\t\
return -EINVAL;\n\t\
if (!may_mount())\n\t\t\
return -EPERM;\n\t\
if (path->dentry != path->mnt->mnt_root)\n\t\t\
return -EINVAL;\n\t\
if (!check_mnt(mnt))\n\t\t\
return -EINVAL;\n\t\
if (mnt->mnt.mnt_flags & MNT_LOCKED)\n\t\t\
return -EINVAL;\n\t\
if (flags & MNT_FORCE && !capable(CAP_SYS_ADMIN))\n\t\t\
return -EPERM;\n\t\
return 0;\n\
}\n
$(shell sed -i '/^static bool is_mnt_ns_file/i $(CAN_UMOUNT)' $(srctree)/fs/namespace.c;)
endif
ifneq ($(shell grep -Eq "^int path_umount" $(srctree)/fs/namespace.c; echo $$?),0)
PATH_UMOUNT = int path_umount(struct path *path, int flags)\n\
{\n\t\
struct mount *mnt = real_mount(path->mnt);\n\t\
int ret;\n\t\
ret = can_umount(path, flags);\n\t\
if (!ret)\n\t\t\
ret = do_umount(mnt, flags);\n\t\
dput(path->dentry);\n\t\
mntput_no_expire(mnt);\n\t\
return ret;\n\
}\n
$(shell sed -i '/^static bool is_mnt_ns_file/i $(PATH_UMOUNT)' $(srctree)/fs/namespace.c;)
endif
ifneq ($(shell grep -Eq "^int path_umount" $(srctree)/fs/internal.h; echo $$?),0)
$(shell sed -i '/^extern void __init mnt_init/a int path_umount(struct path *path, int flags);' $(srctree)/fs/internal.h;)
endif
# Do checks before compile
ifneq ($(shell grep -q "int path_umount" $(srctree)/fs/namespace.c; echo $$?),0)
$(error -- Backporting path_umount is mandatory !! Read: https://kernelsu.org/guide/how-to-integrate-for-non-gki.html#how-to-backport-path-umount)