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linprocfs: Rework according to the new ABI altroot facility

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By 3d2fec7d the ABI prefix path added to the struct pwd.
Use it in the mounts, mountinfo filler functions.

Differential revision:	https://reviews.freebsd.org/D39438
MFC after:		2 month
This commit is contained in:
Dmitry Chagin 2023-05-29 11:18:37 +03:00
parent d706d02edb
commit a482fffc7e
1 changed files with 23 additions and 29 deletions
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52
sys/compat/linprocfs/linprocfs.c
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@ -526,29 +526,26 @@ _sbuf_mntoptions_helper(struct sbuf *sb, uint64_t f_flags)
static int
linprocfs_domtab(PFS_FILL_ARGS)
{
struct nameidata nd;
const char *lep, *mntto, *mntfrom, *fstype;
const char *mntto, *mntfrom, *fstype;
char *dlep, *flep;
struct vnode *vp;
struct pwd *pwd;
size_t lep_len;
int error;
struct statfs *buf, *sp;
size_t count;
/* resolve symlinks etc. in the emulation tree prefix */
/*
* Ideally, this would use the current chroot rather than some
* hardcoded path.
* Resolve emulation tree prefix
*/
NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, linux_emul_path);
flep = NULL;
error = namei(&nd);
lep = linux_emul_path;
if (error == 0) {
if (vn_fullpath(nd.ni_vp, &dlep, &flep) == 0)
lep = dlep;
vrele(nd.ni_vp);
}
lep_len = strlen(lep);
pwd = pwd_hold(td);
vp = pwd->pwd_adir;
error = vn_fullpath_global(vp, &dlep, &flep);
pwd_drop(pwd);
if (error != 0)
return (error);
lep_len = strlen(dlep);
buf = NULL;
error = kern_getfsstat(td, &buf, SIZE_T_MAX, &count,
@ -567,7 +564,7 @@ linprocfs_domtab(PFS_FILL_ARGS)
}
/* determine mount point */
if (strncmp(mntto, lep, lep_len) == 0 && mntto[lep_len] == '/')
if (strncmp(mntto, dlep, lep_len) == 0 && mntto[lep_len] == '/')
mntto += lep_len;
sbuf_printf(sb, "%s %s %s ", mntfrom, mntto, fstype);
@ -584,28 +581,25 @@ linprocfs_domtab(PFS_FILL_ARGS)
static int
linprocfs_doprocmountinfo(PFS_FILL_ARGS)
{
struct nameidata nd;
const char *mntfrom, *mntto, *fstype;
const char *lep;
char *dlep, *flep;
struct statfs *buf, *sp;
size_t count, lep_len;
struct vnode *vp;
struct pwd *pwd;
int error;
/*
* Ideally, this would use the current chroot rather than some
* hardcoded path.
* Resolve emulation tree prefix
*/
NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, linux_emul_path);
flep = NULL;
error = namei(&nd);
lep = linux_emul_path;
if (error == 0) {
if (vn_fullpath(nd.ni_vp, &dlep, &flep) == 0)
lep = dlep;
vrele(nd.ni_vp);
}
lep_len = strlen(lep);
pwd = pwd_hold(td);
vp = pwd->pwd_adir;
error = vn_fullpath_global(vp, &dlep, &flep);
pwd_drop(pwd);
if (error != 0)
return (error);
lep_len = strlen(dlep);
buf = NULL;
error = kern_getfsstat(td, &buf, SIZE_T_MAX, &count,
@ -620,7 +614,7 @@ linprocfs_doprocmountinfo(PFS_FILL_ARGS)
continue;
}
if (strncmp(mntto, lep, lep_len) == 0 && mntto[lep_len] == '/')
if (strncmp(mntto, dlep, lep_len) == 0 && mntto[lep_len] == '/')
mntto += lep_len;
#if 0
/*