git: c51660a62251 - main - fusefs: exterrorize fuse_vnops.c
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Date: Fri, 04 Jul 2025 07:32:02 UTC
The branch main has been updated by arrowd:
URL: https://cgit.FreeBSD.org/src/commit/?id=c51660a62251b37ecb7e9a5a7609097fd13d6385
commit c51660a62251b37ecb7e9a5a7609097fd13d6385
Author: Gleb Popov <arrowd@FreeBSD.org>
AuthorDate: 2025-06-17 10:11:14 +0000
Commit: Gleb Popov <arrowd@FreeBSD.org>
CommitDate: 2025-07-04 07:14:21 +0000
fusefs: exterrorize fuse_vnops.c
Approved by: asomers
Pull Request: https://github.com/freebsd/freebsd-src/pull/1727
---
sys/fs/fuse/fuse_vnops.c | 197 +++++++++++++++++++++++++++++------------------
1 file changed, 123 insertions(+), 74 deletions(-)
diff --git a/sys/fs/fuse/fuse_vnops.c b/sys/fs/fuse/fuse_vnops.c
index f3a9d80208b7..ae28617537fd 100644
--- a/sys/fs/fuse/fuse_vnops.c
+++ b/sys/fs/fuse/fuse_vnops.c
@@ -89,6 +89,8 @@
#include <sys/buf.h>
#include <sys/sysctl.h>
#include <sys/vmmeter.h>
+#define EXTERR_CATEGORY EXTERR_CAT_FUSE
+#include <sys/exterrvar.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
@@ -439,7 +441,8 @@ fuse_vnop_access(struct vop_access_args *ap)
if (vnode_isvroot(vp)) {
return 0;
}
- return ENXIO;
+ return (EXTERROR(ENXIO, "This FUSE session is about "
+ "to be closed"));
}
if (!(data->dataflags & FSESS_INITED)) {
if (vnode_isvroot(vp)) {
@@ -448,7 +451,8 @@ fuse_vnop_access(struct vop_access_args *ap)
return 0;
}
}
- return EBADF;
+ return (EXTERROR(EBADF, "Access denied until FUSE session "
+ "is initialized"));
}
if (vnode_islnk(vp)) {
return 0;
@@ -489,7 +493,8 @@ fuse_vnop_advlock(struct vop_advlock_args *ap)
dataflags = fuse_get_mpdata(vnode_mount(vp))->dataflags;
if (fuse_isdeadfs(vp)) {
- return ENXIO;
+ return (EXTERROR(ENXIO, "This FUSE session is about "
+ "to be closed"));
}
switch(ap->a_op) {
@@ -506,7 +511,7 @@ fuse_vnop_advlock(struct vop_advlock_args *ap)
op = FUSE_SETLK;
break;
default:
- return EINVAL;
+ return (EXTERROR(EINVAL, "Unsupported lock flags"));
}
if (!(dataflags & FSESS_POSIX_LOCKS))
@@ -534,14 +539,14 @@ fuse_vnop_advlock(struct vop_advlock_args *ap)
size = vattr.va_size;
if (size > OFF_MAX ||
(fl->l_start > 0 && size > OFF_MAX - fl->l_start)) {
- err = EOVERFLOW;
+ err = EXTERROR(EOVERFLOW, "Offset is too large");
goto out;
}
start = size + fl->l_start;
break;
default:
- return (EINVAL);
+ return (EXTERROR(EINVAL, "Unsupported offset type"));
}
err = fuse_filehandle_get_anyflags(vp, &fufh, cred, pid);
@@ -603,7 +608,8 @@ fuse_vnop_allocate(struct vop_allocate_args *ap)
int err;
if (fuse_isdeadfs(vp))
- return (ENXIO);
+ return (EXTERROR(ENXIO, "This FUSE session is about "
+ "to be closed"));
switch (vp->v_type) {
case VFIFO:
@@ -619,7 +625,8 @@ fuse_vnop_allocate(struct vop_allocate_args *ap)
return (EROFS);
if (fsess_not_impl(mp, FUSE_FALLOCATE))
- return (EINVAL);
+ return (EXTERROR(EINVAL, "This server does not implement "
+ "FUSE_FALLOCATE"));
io.uio_offset = *offset;
io.uio_resid = *len;
@@ -649,13 +656,14 @@ fuse_vnop_allocate(struct vop_allocate_args *ap)
if (err == ENOSYS) {
fsess_set_notimpl(mp, FUSE_FALLOCATE);
- err = EINVAL;
+ err = EXTERROR(EINVAL, "This server does not implement "
+ "FUSE_ALLOCATE");
} else if (err == EOPNOTSUPP) {
/*
* The file system server does not support FUSE_FALLOCATE with
* the supplied mode for this particular file.
*/
- err = EINVAL;
+ err = EXTERROR(EINVAL, "This file can't be pre-allocated");
} else if (!err) {
*offset += *len;
*len = 0;
@@ -701,7 +709,8 @@ fuse_vnop_bmap(struct vop_bmap_args *ap)
int maxrun;
if (fuse_isdeadfs(vp)) {
- return ENXIO;
+ return (EXTERROR(ENXIO, "This FUSE session is about "
+ "to be closed"));
}
mp = vnode_mount(vp);
@@ -868,19 +877,21 @@ fuse_vnop_copy_file_range(struct vop_copy_file_range_args *ap)
pid_t pid;
int err;
- err = ENOSYS;
if (mp == NULL || mp != vnode_mount(outvp))
- goto fallback;
+ return (EXTERROR(ENOSYS, "Mount points do not match"));
if (incred->cr_uid != outcred->cr_uid)
- goto fallback;
+ return (EXTERROR(ENOSYS, "FUSE_COPY_FILE_RANGE does not "
+ "support different credentials for infd and outfd"));
if (incred->cr_groups[0] != outcred->cr_groups[0])
- goto fallback;
+ return (EXTERROR(ENOSYS, "FUSE_COPY_FILE_RANGE does not "
+ "support different credentials for infd and outfd"));
/* Caller busied mp, mnt_data can be safely accessed. */
if (fsess_not_impl(mp, FUSE_COPY_FILE_RANGE))
- goto fallback;
+ return (EXTERROR(ENOSYS, "This daemon does not "
+ "implement COPY_FILE_RANGE"));
if (ap->a_fsizetd == NULL)
td = curthread;
@@ -890,7 +901,7 @@ fuse_vnop_copy_file_range(struct vop_copy_file_range_args *ap)
vn_lock_pair(invp, false, LK_SHARED, outvp, false, LK_EXCLUSIVE);
if (invp->v_data == NULL || outvp->v_data == NULL) {
- err = EBADF;
+ err = EXTERROR(EBADF, "vnode got reclaimed");
goto unlock;
}
@@ -954,7 +965,6 @@ unlock:
if (err == ENOSYS)
fsess_set_notimpl(mp, FUSE_COPY_FILE_RANGE);
-fallback:
/*
* No need to call vn_rlimit_fsizex_res before return, since the uio is
@@ -1022,7 +1032,8 @@ fuse_vnop_create(struct vop_create_args *ap)
int flags;
if (fuse_isdeadfs(dvp))
- return ENXIO;
+ return (EXTERROR(ENXIO, "This FUSE session is about "
+ "to be closed"));
/* FUSE expects sockets to be created with FUSE_MKNOD */
if (vap->va_type == VSOCK)
@@ -1038,7 +1049,7 @@ fuse_vnop_create(struct vop_create_args *ap)
bzero(&fdi, sizeof(fdi));
if (vap->va_type != VREG)
- return (EINVAL);
+ return (EXTERROR(EINVAL, "Only regular files can be created"));
if (fsess_not_impl(mp, FUSE_CREATE) || vap->va_type == VSOCK) {
/* Fallback to FUSE_MKNOD/FUSE_OPEN */
@@ -1219,8 +1230,8 @@ fuse_vnop_getattr(struct vop_getattr_args *ap)
if (!(dataflags & FSESS_INITED)) {
if (!vnode_isvroot(vp)) {
fdata_set_dead(fuse_get_mpdata(vnode_mount(vp)));
- err = ENOTCONN;
- return err;
+ return (EXTERROR(ENOTCONN, "FUSE daemon is not "
+ "initialized"));
} else {
goto fake;
}
@@ -1349,10 +1360,11 @@ fuse_vnop_link(struct vop_link_args *ap)
int err;
if (fuse_isdeadfs(vp)) {
- return ENXIO;
+ return (EXTERROR(ENXIO, "This FUSE session is about "
+ "to be closed"));
}
if (vnode_mount(tdvp) != vnode_mount(vp)) {
- return EXDEV;
+ return (EXDEV);
}
/*
@@ -1362,7 +1374,7 @@ fuse_vnop_link(struct vop_link_args *ap)
* validating that nlink does not overflow.
*/
if (vap != NULL && vap->va_nlink >= FUSE_LINK_MAX)
- return EMLINK;
+ return (EMLINK);
fli.oldnodeid = VTOI(vp);
fdisp_init(&fdi, 0);
@@ -1374,12 +1386,13 @@ fuse_vnop_link(struct vop_link_args *ap)
feo = fdi.answ;
if (fli.oldnodeid != feo->nodeid) {
+ static const char exterr[] = "Server assigned wrong inode "
+ "for a hard link.";
struct fuse_data *data = fuse_get_mpdata(vnode_mount(vp));
- fuse_warn(data, FSESS_WARN_ILLEGAL_INODE,
- "Assigned wrong inode for a hard link.");
+ fuse_warn(data, FSESS_WARN_ILLEGAL_INODE, exterr);
fuse_vnode_clear_attr_cache(vp);
fuse_vnode_clear_attr_cache(tdvp);
- err = EIO;
+ err = EXTERROR(EIO, exterr);
goto out;
}
@@ -1456,7 +1469,8 @@ fuse_vnop_lookup(struct vop_lookup_args *ap)
if (fuse_isdeadfs(dvp)) {
*vpp = NULL;
- return ENXIO;
+ return (EXTERROR(ENXIO, "This FUSE session is about "
+ "to be closed"));
}
if (!vnode_isdir(dvp))
return ENOTDIR;
@@ -1476,7 +1490,8 @@ fuse_vnop_lookup(struct vop_lookup_args *ap)
* Since the file system doesn't support ".." lookups,
* we have no way to find this entry.
*/
- return ESTALE;
+ return (EXTERROR(ESTALE, "This server does not support "
+ "'..' lookups"));
}
nid = VTOFUD(dvp)->parent_nid;
if (nid == 0)
@@ -1599,11 +1614,11 @@ fuse_vnop_lookup(struct vop_lookup_args *ap)
vref(dvp);
*vpp = dvp;
} else {
+ static const char exterr[] = "Server assigned "
+ "same inode to both parent and child.";
fuse_warn(fuse_get_mpdata(mp),
- FSESS_WARN_ILLEGAL_INODE,
- "Assigned same inode to both parent and "
- "child.");
- err = EIO;
+ FSESS_WARN_ILLEGAL_INODE, exterr);
+ err = EXTERROR(EIO, exterr);
}
} else {
@@ -1691,7 +1706,8 @@ fuse_vnop_mkdir(struct vop_mkdir_args *ap)
struct fuse_mkdir_in fmdi;
if (fuse_isdeadfs(dvp)) {
- return ENXIO;
+ return (EXTERROR(ENXIO, "This FUSE session is about "
+ "to be closed"));
}
fmdi.mode = MAKEIMODE(vap->va_type, vap->va_mode);
fmdi.umask = curthread->td_proc->p_pd->pd_cmask;
@@ -1718,7 +1734,8 @@ fuse_vnop_mknod(struct vop_mknod_args *ap)
struct vattr *vap = ap->a_vap;
if (fuse_isdeadfs(dvp))
- return ENXIO;
+ return (EXTERROR(ENXIO, "This FUSE session is about "
+ "to be closed"));
return fuse_internal_mknod(dvp, vpp, cnp, vap);
}
@@ -1742,11 +1759,13 @@ fuse_vnop_open(struct vop_open_args *ap)
pid_t pid = td->td_proc->p_pid;
if (fuse_isdeadfs(vp))
- return ENXIO;
+ return (EXTERROR(ENXIO, "This FUSE session is about "
+ "to be closed"));
if (vp->v_type == VCHR || vp->v_type == VBLK || vp->v_type == VFIFO)
- return (EOPNOTSUPP);
+ return (EXTERROR(EOPNOTSUPP, "Unsupported vnode type",
+ vp->v_type));
if ((a_mode & (FREAD | FWRITE | FEXEC)) == 0)
- return EINVAL;
+ return (EXTERROR(EINVAL, "Illegal mode", a_mode));
if (fuse_filehandle_validrw(vp, a_mode, cred, pid)) {
fuse_vnode_open(vp, 0, td);
@@ -1828,7 +1847,8 @@ fuse_vnop_pathconf(struct vop_pathconf_args *ap)
return (0);
} else if (fsess_not_impl(mp, FUSE_LSEEK)) {
/* FUSE_LSEEK is not implemented */
- return (EINVAL);
+ return (EXTERROR(EINVAL, "This server does not "
+ "implement FUSE_LSEEK"));
} else {
return (err);
}
@@ -1862,7 +1882,8 @@ fuse_vnop_read(struct vop_read_args *ap)
MPASS(vp->v_type == VREG || vp->v_type == VDIR);
if (fuse_isdeadfs(vp)) {
- return ENXIO;
+ return (EXTERROR(ENXIO, "This FUSE session is about "
+ "to be closed"));
}
if (VTOFUD(vp)->flag & FN_DIRECTIO) {
@@ -1939,10 +1960,11 @@ fuse_vnop_readdir(struct vop_readdir_args *ap)
if (ap->a_eofflag)
*ap->a_eofflag = 0;
if (fuse_isdeadfs(vp)) {
- return ENXIO;
+ return (EXTERROR(ENXIO, "This FUSE session is about "
+ "to be closed"));
}
if (uio_resid(uio) < sizeof(struct dirent))
- return EINVAL;
+ return (EXTERROR(EINVAL, "Buffer is too small"));
tresid = uio->uio_resid;
err = fuse_filehandle_get_dir(vp, &fufh, cred, pid);
@@ -2012,7 +2034,8 @@ fuse_vnop_readlink(struct vop_readlink_args *ap)
int err;
if (fuse_isdeadfs(vp)) {
- return ENXIO;
+ return (EXTERROR(ENXIO, "This FUSE session is about "
+ "to be closed"));
}
if (!vnode_islnk(vp)) {
return EINVAL;
@@ -2023,10 +2046,11 @@ fuse_vnop_readlink(struct vop_readlink_args *ap)
goto out;
}
if (strnlen(fdi.answ, fdi.iosize) + 1 < fdi.iosize) {
+ static const char exterr[] = "Server returned an embedded NUL "
+ "from FUSE_READLINK.";
struct fuse_data *data = fuse_get_mpdata(vnode_mount(vp));
- fuse_warn(data, FSESS_WARN_READLINK_EMBEDDED_NUL,
- "Returned an embedded NUL from FUSE_READLINK.");
- err = EIO;
+ fuse_warn(data, FSESS_WARN_READLINK_EMBEDDED_NUL, exterr);
+ err = EXTERROR(EIO, exterr);
goto out;
}
if (((char *)fdi.answ)[0] == '/' &&
@@ -2110,10 +2134,11 @@ fuse_vnop_remove(struct vop_remove_args *ap)
int err;
if (fuse_isdeadfs(vp)) {
- return ENXIO;
+ return (EXTERROR(ENXIO, "This FUSE session is about "
+ "to be closed"));
}
if (vnode_isdir(vp)) {
- return EPERM;
+ return (EXTERROR(EPERM, "vnode is a directory"));
}
err = fuse_internal_remove(dvp, vp, cnp, FUSE_UNLINK);
@@ -2146,12 +2171,13 @@ fuse_vnop_rename(struct vop_rename_args *ap)
int err = 0;
if (fuse_isdeadfs(fdvp)) {
- return ENXIO;
+ return (EXTERROR(ENXIO, "This FUSE session is about "
+ "to be closed"));
}
if (fvp->v_mount != tdvp->v_mount ||
(tvp && fvp->v_mount != tvp->v_mount)) {
SDT_PROBE2(fusefs, , vnops, trace, 1, "cross-device rename");
- err = EXDEV;
+ err = EXTERROR(EXDEV, "Cross-device rename");
goto out;
}
cache_purge(fvp);
@@ -2222,10 +2248,12 @@ fuse_vnop_rmdir(struct vop_rmdir_args *ap)
int err;
if (fuse_isdeadfs(vp)) {
- return ENXIO;
+ return (EXTERROR(ENXIO, "This FUSE session is about "
+ "to be closed"));
}
if (VTOFUD(vp) == VTOFUD(dvp)) {
- return EINVAL;
+ return (EXTERROR(EINVAL, "Directory to be removed "
+ "contains itself"));
}
err = fuse_internal_remove(dvp, vp, ap->a_cnp, FUSE_RMDIR);
@@ -2262,7 +2290,8 @@ fuse_vnop_setattr(struct vop_setattr_args *ap)
checkperm = dataflags & FSESS_DEFAULT_PERMISSIONS;
if (fuse_isdeadfs(vp)) {
- return ENXIO;
+ return (EXTERROR(ENXIO, "This FUSE session is about "
+ "to be closed"));
}
if (vap->va_uid != (uid_t)VNOVAL) {
@@ -2427,7 +2456,8 @@ fuse_vnop_symlink(struct vop_symlink_args *ap)
size_t len;
if (fuse_isdeadfs(dvp)) {
- return ENXIO;
+ return (EXTERROR(ENXIO, "This FUSE session is about "
+ "to be closed"));
}
/*
* Unlike the other creator type calls, here we have to create a message
@@ -2473,7 +2503,8 @@ fuse_vnop_write(struct vop_write_args *ap)
MPASS(vp->v_type == VREG || vp->v_type == VDIR);
if (fuse_isdeadfs(vp)) {
- return ENXIO;
+ return (EXTERROR(ENXIO, "This FUSE session is about "
+ "to be closed"));
}
if (VTOFUD(vp)->flag & FN_DIRECTIO) {
@@ -2626,10 +2657,12 @@ fuse_vnop_getextattr(struct vop_getextattr_args *ap)
int err;
if (fuse_isdeadfs(vp))
- return (ENXIO);
+ return (EXTERROR(ENXIO, "This FUSE session is about "
+ "to be closed"));
if (fsess_not_impl(mp, FUSE_GETXATTR))
- return EOPNOTSUPP;
+ return (EXTERROR(EOPNOTSUPP, "This server does not implement "
+ "extended attributes"));
err = fuse_extattr_check_cred(vp, ap->a_attrnamespace, cred, td, VREAD);
if (err)
@@ -2667,7 +2700,8 @@ fuse_vnop_getextattr(struct vop_getextattr_args *ap)
if (err != 0) {
if (err == ENOSYS) {
fsess_set_notimpl(mp, FUSE_GETXATTR);
- err = EOPNOTSUPP;
+ err = (EXTERROR(EOPNOTSUPP, "This server does not "
+ "implement extended attributes"));
}
goto out;
}
@@ -2713,10 +2747,12 @@ fuse_vnop_setextattr(struct vop_setextattr_args *ap)
int err;
if (fuse_isdeadfs(vp))
- return (ENXIO);
+ return (EXTERROR(ENXIO, "This FUSE session is about "
+ "to be closed"));
if (fsess_not_impl(mp, FUSE_SETXATTR))
- return EOPNOTSUPP;
+ return (EXTERROR(EOPNOTSUPP, "This server does not implement "
+ "setting extended attributes"));
if (vfs_isrdonly(mp))
return EROFS;
@@ -2728,9 +2764,11 @@ fuse_vnop_setextattr(struct vop_setextattr_args *ap)
* return EOPNOTSUPP.
*/
if (fsess_not_impl(mp, FUSE_REMOVEXATTR))
- return (EOPNOTSUPP);
+ return (EXTERROR(EOPNOTSUPP, "This server does not "
+ "implement removing extended attributess"));
else
- return (EINVAL);
+ return (EXTERROR(EINVAL, "DELETEEXTATTR should be used "
+ "to remove extattrs"));
}
err = fuse_extattr_check_cred(vp, ap->a_attrnamespace, cred, td,
@@ -2776,7 +2814,8 @@ fuse_vnop_setextattr(struct vop_setextattr_args *ap)
if (err == ENOSYS) {
fsess_set_notimpl(mp, FUSE_SETXATTR);
- err = EOPNOTSUPP;
+ err = EXTERROR(EOPNOTSUPP, "This server does not implement "
+ "setting extended attributes");
}
if (err == ERESTART) {
/* Can't restart after calling uiomove */
@@ -2887,10 +2926,12 @@ fuse_vnop_listextattr(struct vop_listextattr_args *ap)
int err;
if (fuse_isdeadfs(vp))
- return (ENXIO);
+ return (EXTERROR(ENXIO, "This FUSE session is about "
+ "to be closed"));
if (fsess_not_impl(mp, FUSE_LISTXATTR))
- return EOPNOTSUPP;
+ return (EXTERROR(EOPNOTSUPP, "This server does not implement "
+ "extended attributes"));
err = fuse_extattr_check_cred(vp, ap->a_attrnamespace, cred, td, VREAD);
if (err)
@@ -2918,7 +2959,8 @@ fuse_vnop_listextattr(struct vop_listextattr_args *ap)
if (err != 0) {
if (err == ENOSYS) {
fsess_set_notimpl(mp, FUSE_LISTXATTR);
- err = EOPNOTSUPP;
+ err = EXTERROR(EOPNOTSUPP, "This server does not "
+ "implement extended attributes");
}
goto out;
}
@@ -3018,7 +3060,8 @@ fuse_vnop_deallocate(struct vop_deallocate_args *ap)
bool closefufh = false;
if (fuse_isdeadfs(vp))
- return (ENXIO);
+ return (EXTERROR(ENXIO, "This FUSE session is about "
+ "to be closed"));
if (vfs_isrdonly(mp))
return (EROFS);
@@ -3124,10 +3167,12 @@ fuse_vnop_deleteextattr(struct vop_deleteextattr_args *ap)
int err;
if (fuse_isdeadfs(vp))
- return (ENXIO);
+ return (EXTERROR(ENXIO, "This FUSE session is about "
+ "to be closed"));
if (fsess_not_impl(mp, FUSE_REMOVEXATTR))
- return EOPNOTSUPP;
+ return (EXTERROR(EOPNOTSUPP, "This server does not implement "
+ "removing extended attributes"));
if (vfs_isrdonly(mp))
return EROFS;
@@ -3156,7 +3201,8 @@ fuse_vnop_deleteextattr(struct vop_deleteextattr_args *ap)
err = fdisp_wait_answ(&fdi);
if (err == ENOSYS) {
fsess_set_notimpl(mp, FUSE_REMOVEXATTR);
- err = EOPNOTSUPP;
+ err = EXTERROR(EOPNOTSUPP, "This server does not implement "
+ "removing extended attributes");
}
fdisp_destroy(&fdi);
@@ -3210,7 +3256,8 @@ fuse_vnop_vptofh(struct vop_vptofh_args *ap)
/* NFS requires lookups for "." and ".." */
SDT_PROBE2(fusefs, , vnops, trace, 1,
"VOP_VPTOFH without FUSE_EXPORT_SUPPORT");
- return EOPNOTSUPP;
+ return (EXTERROR(EOPNOTSUPP, "This server is "
+ "missing FUSE_EXPORT_SUPPORT"));
}
if ((mp->mnt_flag & MNT_EXPORTED) &&
fsess_is_impl(mp, FUSE_OPENDIR))
@@ -3228,7 +3275,8 @@ fuse_vnop_vptofh(struct vop_vptofh_args *ap)
*/
SDT_PROBE2(fusefs, , vnops, trace, 1,
"VOP_VPTOFH with FUSE_OPENDIR");
- return EOPNOTSUPP;
+ return (EXTERROR(EOPNOTSUPP, "This server implements "
+ "FUSE_OPENDIR so is not compatible with getfh"));
}
err = fuse_internal_getattr(vp, &va, curthread->td_ucred, curthread);
@@ -3242,6 +3290,7 @@ fuse_vnop_vptofh(struct vop_vptofh_args *ap)
if (fvdat->generation <= UINT32_MAX)
fhp->gen = fvdat->generation;
else
- return EOVERFLOW;
+ return (EXTERROR(EOVERFLOW, "inode generation "
+ "number overflow"));
return (0);
}