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mirror_zfs/module/os/linux/zfs/zpl_inode.c
Sanjeev Bagewadi 20232ecfaa Support for longnames for files/directories (Linux part) 
This patch adds the ability for zfs to support file/dir name up to 1023
bytes. This number is chosen so we can support up to 255 4-byte
characters. This new feature is represented by the new feature flag
feature@longname.

A new dataset property "longname" is also introduced to toggle longname
support for each dataset individually. This property can be disabled,
even if it contains longname files. In such case, new file cannot be
created with longname but existing longname files can still be looked
up.

Note that, to my knowledge native Linux filesystems don't support name
longer than 255 bytes. So there might be programs not able to work with
longname.

Note that NFS server may needs to use exportfs_get_name to reconnect
dentries, and the buffer being passed is limit to NAME_MAX+1 (256). So
NFS may not work when longname is enabled.

Note, FreeBSD vfs layer imposes a limit of 255 name lengh, so even
though we add code to support it here, it won't actually work.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Signed-off-by: Chunwei Chen <david.chen@nutanix.com>
Closes #15921
2024-10-01 13:40:27 -07:00

852 lines
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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or https://opensource.org/licenses/CDDL-1.0.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2011, Lawrence Livermore National Security, LLC.
* Copyright (c) 2015 by Chunwei Chen. All rights reserved.
*/
#include <sys/sysmacros.h>
#include <sys/zfs_ctldir.h>
#include <sys/zfs_vfsops.h>
#include <sys/zfs_vnops.h>
#include <sys/zfs_znode.h>
#include <sys/dmu_objset.h>
#include <sys/vfs.h>
#include <sys/zpl.h>
#include <sys/file.h>
static struct dentry *
zpl_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
{
cred_t *cr = CRED();
struct inode *ip;
znode_t *zp;
int error;
fstrans_cookie_t cookie;
pathname_t *ppn = NULL;
pathname_t pn;
int zfs_flags = 0;
zfsvfs_t *zfsvfs = dentry->d_sb->s_fs_info;
dsl_dataset_t *ds = dmu_objset_ds(zfsvfs->z_os);
size_t dlen = dlen(dentry);
/*
* If z_longname is disabled, disallow create or rename of names
* longer than ZAP_MAXNAMELEN.
*
* This is needed in cases where longname was enabled first and some
* files/dirs with names > ZAP_MAXNAMELEN were created. And later
* longname was disabled. In such a case allow access to existing
* longnames. But disallow creation newer longnamed entities.
*/
if (!zfsvfs->z_longname && (dlen >= ZAP_MAXNAMELEN)) {
/*
* If this is for create or rename fail it.
*/
if (!dsl_dataset_feature_is_active(ds, SPA_FEATURE_LONGNAME) ||
(flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET)))
return (ERR_PTR(-ENAMETOOLONG));
}
if (dlen >= ZAP_MAXNAMELEN_NEW) {
return (ERR_PTR(-ENAMETOOLONG));
}
crhold(cr);
cookie = spl_fstrans_mark();
/* If we are a case insensitive fs, we need the real name */
if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE) {
zfs_flags = FIGNORECASE;
pn_alloc(&pn);
ppn = &pn;
}
error = -zfs_lookup(ITOZ(dir), dname(dentry), &zp,
zfs_flags, cr, NULL, ppn);
spl_fstrans_unmark(cookie);
ASSERT3S(error, <=, 0);
crfree(cr);
spin_lock(&dentry->d_lock);
dentry->d_time = jiffies;
spin_unlock(&dentry->d_lock);
if (error) {
/*
* If we have a case sensitive fs, we do not want to
* insert negative entries, so return NULL for ENOENT.
* Fall through if the error is not ENOENT. Also free memory.
*/
if (ppn) {
pn_free(ppn);
if (error == -ENOENT)
return (NULL);
}
if (error == -ENOENT)
return (d_splice_alias(NULL, dentry));
else
return (ERR_PTR(error));
}
ip = ZTOI(zp);
/*
* If we are case insensitive, call the correct function
* to install the name.
*/
if (ppn) {
struct dentry *new_dentry;
struct qstr ci_name;
if (strcmp(dname(dentry), pn.pn_buf) == 0) {
new_dentry = d_splice_alias(ip, dentry);
} else {
ci_name.name = pn.pn_buf;
ci_name.len = strlen(pn.pn_buf);
new_dentry = d_add_ci(dentry, ip, &ci_name);
}
pn_free(ppn);
return (new_dentry);
} else {
return (d_splice_alias(ip, dentry));
}
}
void
zpl_vap_init(vattr_t *vap, struct inode *dir, umode_t mode, cred_t *cr,
zidmap_t *mnt_ns)
{
vap->va_mask = ATTR_MODE;
vap->va_mode = mode;
vap->va_uid = zfs_vfsuid_to_uid(mnt_ns,
zfs_i_user_ns(dir), crgetuid(cr));
if (dir->i_mode & S_ISGID) {
vap->va_gid = KGID_TO_SGID(dir->i_gid);
if (S_ISDIR(mode))
vap->va_mode |= S_ISGID;
} else {
vap->va_gid = zfs_vfsgid_to_gid(mnt_ns,
zfs_i_user_ns(dir), crgetgid(cr));
}
}
static inline bool
is_nametoolong(struct dentry *dentry)
{
zfsvfs_t *zfsvfs = dentry->d_sb->s_fs_info;
size_t dlen = dlen(dentry);
return ((!zfsvfs->z_longname && dlen >= ZAP_MAXNAMELEN) ||
dlen >= ZAP_MAXNAMELEN_NEW);
}
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)
#elif defined(HAVE_IOPS_CREATE_IDMAP)
zpl_create(struct mnt_idmap *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;
vattr_t *vap;
int error;
fstrans_cookie_t cookie;
#if !(defined(HAVE_IOPS_CREATE_USERNS) || defined(HAVE_IOPS_CREATE_IDMAP))
zidmap_t *user_ns = kcred->user_ns;
#endif
if (is_nametoolong(dentry)) {
return (-ENAMETOOLONG);
}
crhold(cr);
vap = kmem_zalloc(sizeof (vattr_t), KM_SLEEP);
zpl_vap_init(vap, dir, mode, cr, user_ns);
cookie = spl_fstrans_mark();
error = -zfs_create(ITOZ(dir), dname(dentry), vap, 0,
mode, &zp, cr, 0, NULL, user_ns);
if (error == 0) {
error = zpl_xattr_security_init(ZTOI(zp), dir, &dentry->d_name);
if (error == 0)
error = zpl_init_acl(ZTOI(zp), dir);
if (error) {
(void) zfs_remove(ITOZ(dir), dname(dentry), cr, 0);
remove_inode_hash(ZTOI(zp));
iput(ZTOI(zp));
} else {
d_instantiate(dentry, ZTOI(zp));
}
}
spl_fstrans_unmark(cookie);
kmem_free(vap, sizeof (vattr_t));
crfree(cr);
ASSERT3S(error, <=, 0);
return (error);
}
static int
#ifdef HAVE_IOPS_MKNOD_USERNS
zpl_mknod(struct user_namespace *user_ns, struct inode *dir,
struct dentry *dentry, umode_t mode,
#elif defined(HAVE_IOPS_MKNOD_IDMAP)
zpl_mknod(struct mnt_idmap *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();
znode_t *zp;
vattr_t *vap;
int error;
fstrans_cookie_t cookie;
#if !(defined(HAVE_IOPS_MKNOD_USERNS) || defined(HAVE_IOPS_MKNOD_IDMAP))
zidmap_t *user_ns = kcred->user_ns;
#endif
if (is_nametoolong(dentry)) {
return (-ENAMETOOLONG);
}
/*
* We currently expect Linux to supply rdev=0 for all sockets
* and fifos, but we want to know if this behavior ever changes.
*/
if (S_ISSOCK(mode) || S_ISFIFO(mode))
ASSERT(rdev == 0);
crhold(cr);
vap = kmem_zalloc(sizeof (vattr_t), KM_SLEEP);
zpl_vap_init(vap, dir, mode, cr, user_ns);
vap->va_rdev = rdev;
cookie = spl_fstrans_mark();
error = -zfs_create(ITOZ(dir), dname(dentry), vap, 0,
mode, &zp, cr, 0, NULL, user_ns);
if (error == 0) {
error = zpl_xattr_security_init(ZTOI(zp), dir, &dentry->d_name);
if (error == 0)
error = zpl_init_acl(ZTOI(zp), dir);
if (error) {
(void) zfs_remove(ITOZ(dir), dname(dentry), cr, 0);
remove_inode_hash(ZTOI(zp));
iput(ZTOI(zp));
} else {
d_instantiate(dentry, ZTOI(zp));
}
}
spl_fstrans_unmark(cookie);
kmem_free(vap, sizeof (vattr_t));
crfree(cr);
ASSERT3S(error, <=, 0);
return (error);
}
static int
#ifdef HAVE_TMPFILE_IDMAP
zpl_tmpfile(struct mnt_idmap *userns, struct inode *dir,
struct file *file, umode_t mode)
#elif !defined(HAVE_TMPFILE_DENTRY)
zpl_tmpfile(struct user_namespace *userns, struct inode *dir,
struct file *file, umode_t mode)
#else
#ifdef HAVE_TMPFILE_USERNS
zpl_tmpfile(struct user_namespace *userns, struct inode *dir,
struct dentry *dentry, umode_t mode)
#else
zpl_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
#endif
#endif
{
cred_t *cr = CRED();
struct inode *ip;
vattr_t *vap;
int error;
fstrans_cookie_t cookie;
#if !(defined(HAVE_TMPFILE_USERNS) || defined(HAVE_TMPFILE_IDMAP))
zidmap_t *userns = kcred->user_ns;
#endif
crhold(cr);
vap = kmem_zalloc(sizeof (vattr_t), KM_SLEEP);
/*
* The VFS does not apply the umask, therefore it is applied here
* when POSIX ACLs are not enabled.
*/
if (!IS_POSIXACL(dir))
mode &= ~current_umask();
zpl_vap_init(vap, dir, mode, cr, userns);
cookie = spl_fstrans_mark();
error = -zfs_tmpfile(dir, vap, 0, mode, &ip, cr, 0, NULL, userns);
if (error == 0) {
/* d_tmpfile will do drop_nlink, so we should set it first */
set_nlink(ip, 1);
#ifndef HAVE_TMPFILE_DENTRY
d_tmpfile(file, ip);
error = zpl_xattr_security_init(ip, dir,
&file->f_path.dentry->d_name);
#else
d_tmpfile(dentry, ip);
error = zpl_xattr_security_init(ip, dir, &dentry->d_name);
#endif
if (error == 0)
error = zpl_init_acl(ip, dir);
#ifndef HAVE_TMPFILE_DENTRY
error = finish_open_simple(file, error);
#endif
/*
* don't need to handle error here, file is already in
* unlinked set.
*/
}
spl_fstrans_unmark(cookie);
kmem_free(vap, sizeof (vattr_t));
crfree(cr);
ASSERT3S(error, <=, 0);
return (error);
}
static int
zpl_unlink(struct inode *dir, struct dentry *dentry)
{
cred_t *cr = CRED();
int error;
fstrans_cookie_t cookie;
zfsvfs_t *zfsvfs = dentry->d_sb->s_fs_info;
crhold(cr);
cookie = spl_fstrans_mark();
error = -zfs_remove(ITOZ(dir), dname(dentry), cr, 0);
/*
* For a CI FS we must invalidate the dentry to prevent the
* creation of negative entries.
*/
if (error == 0 && zfsvfs->z_case == ZFS_CASE_INSENSITIVE)
d_invalidate(dentry);
spl_fstrans_unmark(cookie);
crfree(cr);
ASSERT3S(error, <=, 0);
return (error);
}
static int
#ifdef HAVE_IOPS_MKDIR_USERNS
zpl_mkdir(struct user_namespace *user_ns, struct inode *dir,
struct dentry *dentry, umode_t mode)
#elif defined(HAVE_IOPS_MKDIR_IDMAP)
zpl_mkdir(struct mnt_idmap *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;
znode_t *zp;
int error;
fstrans_cookie_t cookie;
#if !(defined(HAVE_IOPS_MKDIR_USERNS) || defined(HAVE_IOPS_MKDIR_IDMAP))
zidmap_t *user_ns = kcred->user_ns;
#endif
if (is_nametoolong(dentry)) {
return (-ENAMETOOLONG);
}
crhold(cr);
vap = kmem_zalloc(sizeof (vattr_t), KM_SLEEP);
zpl_vap_init(vap, dir, mode | S_IFDIR, cr, user_ns);
cookie = spl_fstrans_mark();
error = -zfs_mkdir(ITOZ(dir), dname(dentry), vap, &zp, cr, 0, NULL,
user_ns);
if (error == 0) {
error = zpl_xattr_security_init(ZTOI(zp), dir, &dentry->d_name);
if (error == 0)
error = zpl_init_acl(ZTOI(zp), dir);
if (error) {
(void) zfs_rmdir(ITOZ(dir), dname(dentry), NULL, cr, 0);
remove_inode_hash(ZTOI(zp));
iput(ZTOI(zp));
} else {
d_instantiate(dentry, ZTOI(zp));
}
}
spl_fstrans_unmark(cookie);
kmem_free(vap, sizeof (vattr_t));
crfree(cr);
ASSERT3S(error, <=, 0);
return (error);
}
static int
zpl_rmdir(struct inode *dir, struct dentry *dentry)
{
cred_t *cr = CRED();
int error;
fstrans_cookie_t cookie;
zfsvfs_t *zfsvfs = dentry->d_sb->s_fs_info;
crhold(cr);
cookie = spl_fstrans_mark();
error = -zfs_rmdir(ITOZ(dir), dname(dentry), NULL, cr, 0);
/*
* For a CI FS we must invalidate the dentry to prevent the
* creation of negative entries.
*/
if (error == 0 && zfsvfs->z_case == ZFS_CASE_INSENSITIVE)
d_invalidate(dentry);
spl_fstrans_unmark(cookie);
crfree(cr);
ASSERT3S(error, <=, 0);
return (error);
}
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)
#elif defined(HAVE_IDMAP_IOPS_GETATTR)
zpl_getattr_impl(struct mnt_idmap *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;
struct inode *ip = path->dentry->d_inode;
znode_t *zp __maybe_unused = ITOZ(ip);
cookie = spl_fstrans_mark();
/*
* XXX query_flags currently ignored.
*/
#ifdef HAVE_GENERIC_FILLATTR_IDMAP_REQMASK
error = -zfs_getattr_fast(user_ns, request_mask, ip, stat);
#elif (defined(HAVE_USERNS_IOPS_GETATTR) || defined(HAVE_IDMAP_IOPS_GETATTR))
error = -zfs_getattr_fast(user_ns, ip, stat);
#else
error = -zfs_getattr_fast(kcred->user_ns, ip, stat);
#endif
#ifdef STATX_BTIME
if (request_mask & STATX_BTIME) {
stat->btime = zp->z_btime;
stat->result_mask |= STATX_BTIME;
}
#endif
#ifdef STATX_ATTR_IMMUTABLE
if (zp->z_pflags & ZFS_IMMUTABLE)
stat->attributes |= STATX_ATTR_IMMUTABLE;
stat->attributes_mask |= STATX_ATTR_IMMUTABLE;
#endif
#ifdef STATX_ATTR_APPEND
if (zp->z_pflags & ZFS_APPENDONLY)
stat->attributes |= STATX_ATTR_APPEND;
stat->attributes_mask |= STATX_ATTR_APPEND;
#endif
#ifdef STATX_ATTR_NODUMP
if (zp->z_pflags & ZFS_NODUMP)
stat->attributes |= STATX_ATTR_NODUMP;
stat->attributes_mask |= STATX_ATTR_NODUMP;
#endif
spl_fstrans_unmark(cookie);
ASSERT3S(error, <=, 0);
return (error);
}
ZPL_GETATTR_WRAPPER(zpl_getattr);
static int
#ifdef HAVE_USERNS_IOPS_SETATTR
zpl_setattr(struct user_namespace *user_ns, struct dentry *dentry,
struct iattr *ia)
#elif defined(HAVE_IDMAP_IOPS_SETATTR)
zpl_setattr(struct mnt_idmap *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();
vattr_t *vap;
int error;
fstrans_cookie_t cookie;
#ifdef HAVE_SETATTR_PREPARE_USERNS
error = zpl_setattr_prepare(user_ns, dentry, ia);
#elif defined(HAVE_SETATTR_PREPARE_IDMAP)
error = zpl_setattr_prepare(user_ns, dentry, ia);
#else
error = zpl_setattr_prepare(zfs_init_idmap, dentry, ia);
#endif
if (error)
return (error);
crhold(cr);
vap = kmem_zalloc(sizeof (vattr_t), KM_SLEEP);
vap->va_mask = ia->ia_valid & ATTR_IATTR_MASK;
vap->va_mode = ia->ia_mode;
if (ia->ia_valid & ATTR_UID)
#ifdef HAVE_IATTR_VFSID
vap->va_uid = zfs_vfsuid_to_uid(user_ns, zfs_i_user_ns(ip),
__vfsuid_val(ia->ia_vfsuid));
#else
vap->va_uid = KUID_TO_SUID(ia->ia_uid);
#endif
if (ia->ia_valid & ATTR_GID)
#ifdef HAVE_IATTR_VFSID
vap->va_gid = zfs_vfsgid_to_gid(user_ns, zfs_i_user_ns(ip),
__vfsgid_val(ia->ia_vfsgid));
#else
vap->va_gid = KGID_TO_SGID(ia->ia_gid);
#endif
vap->va_size = ia->ia_size;
vap->va_atime = ia->ia_atime;
vap->va_mtime = ia->ia_mtime;
vap->va_ctime = ia->ia_ctime;
if (vap->va_mask & ATTR_ATIME)
zpl_inode_set_atime_to_ts(ip,
zpl_inode_timestamp_truncate(ia->ia_atime, ip));
cookie = spl_fstrans_mark();
#ifdef HAVE_USERNS_IOPS_SETATTR
error = -zfs_setattr(ITOZ(ip), vap, 0, cr, user_ns);
#elif defined(HAVE_IDMAP_IOPS_SETATTR)
error = -zfs_setattr(ITOZ(ip), vap, 0, cr, user_ns);
#else
error = -zfs_setattr(ITOZ(ip), vap, 0, cr, zfs_init_idmap);
#endif
if (!error && (ia->ia_valid & ATTR_MODE))
error = zpl_chmod_acl(ip);
spl_fstrans_unmark(cookie);
kmem_free(vap, sizeof (vattr_t));
crfree(cr);
ASSERT3S(error, <=, 0);
return (error);
}
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 rflags)
#elif defined(HAVE_IOPS_RENAME_IDMAP)
zpl_rename2(struct mnt_idmap *user_ns, struct inode *sdip,
struct dentry *sdentry, struct inode *tdip, struct dentry *tdentry,
unsigned int rflags)
#else
zpl_rename2(struct inode *sdip, struct dentry *sdentry,
struct inode *tdip, struct dentry *tdentry, unsigned int rflags)
#endif
{
cred_t *cr = CRED();
vattr_t *wo_vap = NULL;
int error;
fstrans_cookie_t cookie;
#if !(defined(HAVE_IOPS_RENAME_USERNS) || defined(HAVE_IOPS_RENAME_IDMAP))
zidmap_t *user_ns = kcred->user_ns;
#endif
if (is_nametoolong(tdentry)) {
return (-ENAMETOOLONG);
}
crhold(cr);
if (rflags & RENAME_WHITEOUT) {
wo_vap = kmem_zalloc(sizeof (vattr_t), KM_SLEEP);
zpl_vap_init(wo_vap, sdip, S_IFCHR, cr, user_ns);
wo_vap->va_rdev = makedevice(0, 0);
}
cookie = spl_fstrans_mark();
error = -zfs_rename(ITOZ(sdip), dname(sdentry), ITOZ(tdip),
dname(tdentry), cr, 0, rflags, wo_vap, user_ns);
spl_fstrans_unmark(cookie);
if (wo_vap)
kmem_free(wo_vap, sizeof (vattr_t));
crfree(cr);
ASSERT3S(error, <=, 0);
return (error);
}
#if !defined(HAVE_IOPS_RENAME_USERNS) && \
!defined(HAVE_RENAME_WANTS_FLAGS) && \
!defined(HAVE_IOPS_RENAME_IDMAP)
static int
zpl_rename(struct inode *sdip, struct dentry *sdentry,
struct inode *tdip, struct dentry *tdentry)
{
return (zpl_rename2(sdip, sdentry, tdip, tdentry, 0));
}
#endif
static int
#ifdef HAVE_IOPS_SYMLINK_USERNS
zpl_symlink(struct user_namespace *user_ns, struct inode *dir,
struct dentry *dentry, const char *name)
#elif defined(HAVE_IOPS_SYMLINK_IDMAP)
zpl_symlink(struct mnt_idmap *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;
znode_t *zp;
int error;
fstrans_cookie_t cookie;
#if !(defined(HAVE_IOPS_SYMLINK_USERNS) || defined(HAVE_IOPS_SYMLINK_IDMAP))
zidmap_t *user_ns = kcred->user_ns;
#endif
if (is_nametoolong(dentry)) {
return (-ENAMETOOLONG);
}
crhold(cr);
vap = kmem_zalloc(sizeof (vattr_t), KM_SLEEP);
zpl_vap_init(vap, dir, S_IFLNK | S_IRWXUGO, cr, user_ns);
cookie = spl_fstrans_mark();
error = -zfs_symlink(ITOZ(dir), dname(dentry), vap,
(char *)name, &zp, cr, 0, user_ns);
if (error == 0) {
error = zpl_xattr_security_init(ZTOI(zp), dir, &dentry->d_name);
if (error) {
(void) zfs_remove(ITOZ(dir), dname(dentry), cr, 0);
remove_inode_hash(ZTOI(zp));
iput(ZTOI(zp));
} else {
d_instantiate(dentry, ZTOI(zp));
}
}
spl_fstrans_unmark(cookie);
kmem_free(vap, sizeof (vattr_t));
crfree(cr);
ASSERT3S(error, <=, 0);
return (error);
}
static void
zpl_put_link(void *ptr)
{
kmem_free(ptr, MAXPATHLEN);
}
static int
zpl_get_link_common(struct dentry *dentry, struct inode *ip, char **link)
{
fstrans_cookie_t cookie;
cred_t *cr = CRED();
int error;
crhold(cr);
*link = NULL;
struct iovec iov;
iov.iov_len = MAXPATHLEN;
iov.iov_base = kmem_zalloc(MAXPATHLEN, KM_SLEEP);
zfs_uio_t uio;
zfs_uio_iovec_init(&uio, &iov, 1, 0, UIO_SYSSPACE, MAXPATHLEN - 1, 0);
cookie = spl_fstrans_mark();
error = -zfs_readlink(ip, &uio, cr);
spl_fstrans_unmark(cookie);
crfree(cr);
if (error)
kmem_free(iov.iov_base, MAXPATHLEN);
else
*link = iov.iov_base;
return (error);
}
static const char *
zpl_get_link(struct dentry *dentry, struct inode *inode,
struct delayed_call *done)
{
char *link = NULL;
int error;
if (!dentry)
return (ERR_PTR(-ECHILD));
error = zpl_get_link_common(dentry, inode, &link);
if (error)
return (ERR_PTR(error));
set_delayed_call(done, zpl_put_link, link);
return (link);
}
static int
zpl_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
{
cred_t *cr = CRED();
struct inode *ip = old_dentry->d_inode;
int error;
fstrans_cookie_t cookie;
if (is_nametoolong(dentry)) {
return (-ENAMETOOLONG);
}
if (ip->i_nlink >= ZFS_LINK_MAX)
return (-EMLINK);
crhold(cr);
zpl_inode_set_ctime_to_ts(ip, current_time(ip));
/* Must have an existing ref, so igrab() cannot return NULL */
VERIFY3P(igrab(ip), !=, NULL);
cookie = spl_fstrans_mark();
error = -zfs_link(ITOZ(dir), ITOZ(ip), dname(dentry), cr, 0);
if (error) {
iput(ip);
goto out;
}
d_instantiate(dentry, ip);
out:
spl_fstrans_unmark(cookie);
crfree(cr);
ASSERT3S(error, <=, 0);
return (error);
}
const struct inode_operations zpl_inode_operations = {
.setattr = zpl_setattr,
.getattr = zpl_getattr,
.listxattr = zpl_xattr_list,
#if defined(CONFIG_FS_POSIX_ACL)
.set_acl = zpl_set_acl,
#if defined(HAVE_GET_INODE_ACL)
.get_inode_acl = zpl_get_acl,
#else
.get_acl = zpl_get_acl,
#endif /* HAVE_GET_INODE_ACL */
#endif /* CONFIG_FS_POSIX_ACL */
};
const struct inode_operations zpl_dir_inode_operations = {
.create = zpl_create,
.lookup = zpl_lookup,
.link = zpl_link,
.unlink = zpl_unlink,
.symlink = zpl_symlink,
.mkdir = zpl_mkdir,
.rmdir = zpl_rmdir,
.mknod = zpl_mknod,
#if defined(HAVE_RENAME_WANTS_FLAGS) || defined(HAVE_IOPS_RENAME_USERNS)
.rename = zpl_rename2,
#elif defined(HAVE_IOPS_RENAME_IDMAP)
.rename = zpl_rename2,
#else
.rename = zpl_rename,
#endif
.tmpfile = zpl_tmpfile,
.setattr = zpl_setattr,
.getattr = zpl_getattr,
.listxattr = zpl_xattr_list,
#if defined(CONFIG_FS_POSIX_ACL)
.set_acl = zpl_set_acl,
#if defined(HAVE_GET_INODE_ACL)
.get_inode_acl = zpl_get_acl,
#else
.get_acl = zpl_get_acl,
#endif /* HAVE_GET_INODE_ACL */
#endif /* CONFIG_FS_POSIX_ACL */
};
const struct inode_operations zpl_symlink_inode_operations = {
.get_link = zpl_get_link,
.setattr = zpl_setattr,
.getattr = zpl_getattr,
.listxattr = zpl_xattr_list,
};
const struct inode_operations zpl_special_inode_operations = {
.setattr = zpl_setattr,
.getattr = zpl_getattr,
.listxattr = zpl_xattr_list,
#if defined(CONFIG_FS_POSIX_ACL)
.set_acl = zpl_set_acl,
#if defined(HAVE_GET_INODE_ACL)
.get_inode_acl = zpl_get_acl,
#else
.get_acl = zpl_get_acl,
#endif /* HAVE_GET_INODE_ACL */
#endif /* CONFIG_FS_POSIX_ACL */
};
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