mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
1447 lines
33 KiB
1447 lines
33 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* linux/fs/9p/vfs_inode.c |
|
* |
|
* This file contains vfs inode ops for the 9P2000 protocol. |
|
* |
|
* Copyright (C) 2004 by Eric Van Hensbergen <[email protected]> |
|
* Copyright (C) 2002 by Ron Minnich <[email protected]> |
|
*/ |
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
|
|
|
#include <linux/module.h> |
|
#include <linux/errno.h> |
|
#include <linux/fs.h> |
|
#include <linux/file.h> |
|
#include <linux/pagemap.h> |
|
#include <linux/stat.h> |
|
#include <linux/string.h> |
|
#include <linux/inet.h> |
|
#include <linux/namei.h> |
|
#include <linux/idr.h> |
|
#include <linux/sched.h> |
|
#include <linux/slab.h> |
|
#include <linux/xattr.h> |
|
#include <linux/posix_acl.h> |
|
#include <net/9p/9p.h> |
|
#include <net/9p/client.h> |
|
|
|
#include "v9fs.h" |
|
#include "v9fs_vfs.h" |
|
#include "fid.h" |
|
#include "cache.h" |
|
#include "xattr.h" |
|
#include "acl.h" |
|
|
|
static const struct inode_operations v9fs_dir_inode_operations; |
|
static const struct inode_operations v9fs_dir_inode_operations_dotu; |
|
static const struct inode_operations v9fs_file_inode_operations; |
|
static const struct inode_operations v9fs_symlink_inode_operations; |
|
|
|
/** |
|
* unixmode2p9mode - convert unix mode bits to plan 9 |
|
* @v9ses: v9fs session information |
|
* @mode: mode to convert |
|
* |
|
*/ |
|
|
|
static u32 unixmode2p9mode(struct v9fs_session_info *v9ses, umode_t mode) |
|
{ |
|
int res; |
|
res = mode & 0777; |
|
if (S_ISDIR(mode)) |
|
res |= P9_DMDIR; |
|
if (v9fs_proto_dotu(v9ses)) { |
|
if (v9ses->nodev == 0) { |
|
if (S_ISSOCK(mode)) |
|
res |= P9_DMSOCKET; |
|
if (S_ISFIFO(mode)) |
|
res |= P9_DMNAMEDPIPE; |
|
if (S_ISBLK(mode)) |
|
res |= P9_DMDEVICE; |
|
if (S_ISCHR(mode)) |
|
res |= P9_DMDEVICE; |
|
} |
|
|
|
if ((mode & S_ISUID) == S_ISUID) |
|
res |= P9_DMSETUID; |
|
if ((mode & S_ISGID) == S_ISGID) |
|
res |= P9_DMSETGID; |
|
if ((mode & S_ISVTX) == S_ISVTX) |
|
res |= P9_DMSETVTX; |
|
} |
|
return res; |
|
} |
|
|
|
/** |
|
* p9mode2perm- convert plan9 mode bits to unix permission bits |
|
* @v9ses: v9fs session information |
|
* @stat: p9_wstat from which mode need to be derived |
|
* |
|
*/ |
|
static int p9mode2perm(struct v9fs_session_info *v9ses, |
|
struct p9_wstat *stat) |
|
{ |
|
int res; |
|
int mode = stat->mode; |
|
|
|
res = mode & S_IALLUGO; |
|
if (v9fs_proto_dotu(v9ses)) { |
|
if ((mode & P9_DMSETUID) == P9_DMSETUID) |
|
res |= S_ISUID; |
|
|
|
if ((mode & P9_DMSETGID) == P9_DMSETGID) |
|
res |= S_ISGID; |
|
|
|
if ((mode & P9_DMSETVTX) == P9_DMSETVTX) |
|
res |= S_ISVTX; |
|
} |
|
return res; |
|
} |
|
|
|
/** |
|
* p9mode2unixmode- convert plan9 mode bits to unix mode bits |
|
* @v9ses: v9fs session information |
|
* @stat: p9_wstat from which mode need to be derived |
|
* @rdev: major number, minor number in case of device files. |
|
* |
|
*/ |
|
static umode_t p9mode2unixmode(struct v9fs_session_info *v9ses, |
|
struct p9_wstat *stat, dev_t *rdev) |
|
{ |
|
int res; |
|
u32 mode = stat->mode; |
|
|
|
*rdev = 0; |
|
res = p9mode2perm(v9ses, stat); |
|
|
|
if ((mode & P9_DMDIR) == P9_DMDIR) |
|
res |= S_IFDIR; |
|
else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses))) |
|
res |= S_IFLNK; |
|
else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses)) |
|
&& (v9ses->nodev == 0)) |
|
res |= S_IFSOCK; |
|
else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses)) |
|
&& (v9ses->nodev == 0)) |
|
res |= S_IFIFO; |
|
else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses)) |
|
&& (v9ses->nodev == 0)) { |
|
char type = 0, ext[32]; |
|
int major = -1, minor = -1; |
|
|
|
strlcpy(ext, stat->extension, sizeof(ext)); |
|
sscanf(ext, "%c %i %i", &type, &major, &minor); |
|
switch (type) { |
|
case 'c': |
|
res |= S_IFCHR; |
|
break; |
|
case 'b': |
|
res |= S_IFBLK; |
|
break; |
|
default: |
|
p9_debug(P9_DEBUG_ERROR, "Unknown special type %c %s\n", |
|
type, stat->extension); |
|
} |
|
*rdev = MKDEV(major, minor); |
|
} else |
|
res |= S_IFREG; |
|
|
|
return res; |
|
} |
|
|
|
/** |
|
* v9fs_uflags2omode- convert posix open flags to plan 9 mode bits |
|
* @uflags: flags to convert |
|
* @extended: if .u extensions are active |
|
*/ |
|
|
|
int v9fs_uflags2omode(int uflags, int extended) |
|
{ |
|
int ret; |
|
|
|
ret = 0; |
|
switch (uflags&3) { |
|
default: |
|
case O_RDONLY: |
|
ret = P9_OREAD; |
|
break; |
|
|
|
case O_WRONLY: |
|
ret = P9_OWRITE; |
|
break; |
|
|
|
case O_RDWR: |
|
ret = P9_ORDWR; |
|
break; |
|
} |
|
|
|
if (extended) { |
|
if (uflags & O_EXCL) |
|
ret |= P9_OEXCL; |
|
|
|
if (uflags & O_APPEND) |
|
ret |= P9_OAPPEND; |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* v9fs_blank_wstat - helper function to setup a 9P stat structure |
|
* @wstat: structure to initialize |
|
* |
|
*/ |
|
|
|
void |
|
v9fs_blank_wstat(struct p9_wstat *wstat) |
|
{ |
|
wstat->type = ~0; |
|
wstat->dev = ~0; |
|
wstat->qid.type = ~0; |
|
wstat->qid.version = ~0; |
|
*((long long *)&wstat->qid.path) = ~0; |
|
wstat->mode = ~0; |
|
wstat->atime = ~0; |
|
wstat->mtime = ~0; |
|
wstat->length = ~0; |
|
wstat->name = NULL; |
|
wstat->uid = NULL; |
|
wstat->gid = NULL; |
|
wstat->muid = NULL; |
|
wstat->n_uid = INVALID_UID; |
|
wstat->n_gid = INVALID_GID; |
|
wstat->n_muid = INVALID_UID; |
|
wstat->extension = NULL; |
|
} |
|
|
|
/** |
|
* v9fs_alloc_inode - helper function to allocate an inode |
|
* |
|
*/ |
|
struct inode *v9fs_alloc_inode(struct super_block *sb) |
|
{ |
|
struct v9fs_inode *v9inode; |
|
v9inode = kmem_cache_alloc(v9fs_inode_cache, GFP_KERNEL); |
|
if (!v9inode) |
|
return NULL; |
|
#ifdef CONFIG_9P_FSCACHE |
|
v9inode->fscache = NULL; |
|
mutex_init(&v9inode->fscache_lock); |
|
#endif |
|
v9inode->writeback_fid = NULL; |
|
v9inode->cache_validity = 0; |
|
mutex_init(&v9inode->v_mutex); |
|
return &v9inode->vfs_inode; |
|
} |
|
|
|
/** |
|
* v9fs_free_inode - destroy an inode |
|
* |
|
*/ |
|
|
|
void v9fs_free_inode(struct inode *inode) |
|
{ |
|
kmem_cache_free(v9fs_inode_cache, V9FS_I(inode)); |
|
} |
|
|
|
int v9fs_init_inode(struct v9fs_session_info *v9ses, |
|
struct inode *inode, umode_t mode, dev_t rdev) |
|
{ |
|
int err = 0; |
|
|
|
inode_init_owner(&init_user_ns,inode, NULL, mode); |
|
inode->i_blocks = 0; |
|
inode->i_rdev = rdev; |
|
inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); |
|
inode->i_mapping->a_ops = &v9fs_addr_operations; |
|
inode->i_private = NULL; |
|
|
|
switch (mode & S_IFMT) { |
|
case S_IFIFO: |
|
case S_IFBLK: |
|
case S_IFCHR: |
|
case S_IFSOCK: |
|
if (v9fs_proto_dotl(v9ses)) { |
|
inode->i_op = &v9fs_file_inode_operations_dotl; |
|
} else if (v9fs_proto_dotu(v9ses)) { |
|
inode->i_op = &v9fs_file_inode_operations; |
|
} else { |
|
p9_debug(P9_DEBUG_ERROR, |
|
"special files without extended mode\n"); |
|
err = -EINVAL; |
|
goto error; |
|
} |
|
init_special_inode(inode, inode->i_mode, inode->i_rdev); |
|
break; |
|
case S_IFREG: |
|
if (v9fs_proto_dotl(v9ses)) { |
|
inode->i_op = &v9fs_file_inode_operations_dotl; |
|
if (v9ses->cache == CACHE_LOOSE || |
|
v9ses->cache == CACHE_FSCACHE) |
|
inode->i_fop = |
|
&v9fs_cached_file_operations_dotl; |
|
else if (v9ses->cache == CACHE_MMAP) |
|
inode->i_fop = &v9fs_mmap_file_operations_dotl; |
|
else |
|
inode->i_fop = &v9fs_file_operations_dotl; |
|
} else { |
|
inode->i_op = &v9fs_file_inode_operations; |
|
if (v9ses->cache == CACHE_LOOSE || |
|
v9ses->cache == CACHE_FSCACHE) |
|
inode->i_fop = |
|
&v9fs_cached_file_operations; |
|
else if (v9ses->cache == CACHE_MMAP) |
|
inode->i_fop = &v9fs_mmap_file_operations; |
|
else |
|
inode->i_fop = &v9fs_file_operations; |
|
} |
|
|
|
break; |
|
case S_IFLNK: |
|
if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { |
|
p9_debug(P9_DEBUG_ERROR, |
|
"extended modes used with legacy protocol\n"); |
|
err = -EINVAL; |
|
goto error; |
|
} |
|
|
|
if (v9fs_proto_dotl(v9ses)) |
|
inode->i_op = &v9fs_symlink_inode_operations_dotl; |
|
else |
|
inode->i_op = &v9fs_symlink_inode_operations; |
|
|
|
break; |
|
case S_IFDIR: |
|
inc_nlink(inode); |
|
if (v9fs_proto_dotl(v9ses)) |
|
inode->i_op = &v9fs_dir_inode_operations_dotl; |
|
else if (v9fs_proto_dotu(v9ses)) |
|
inode->i_op = &v9fs_dir_inode_operations_dotu; |
|
else |
|
inode->i_op = &v9fs_dir_inode_operations; |
|
|
|
if (v9fs_proto_dotl(v9ses)) |
|
inode->i_fop = &v9fs_dir_operations_dotl; |
|
else |
|
inode->i_fop = &v9fs_dir_operations; |
|
|
|
break; |
|
default: |
|
p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n", |
|
mode, mode & S_IFMT); |
|
err = -EINVAL; |
|
goto error; |
|
} |
|
error: |
|
return err; |
|
|
|
} |
|
|
|
/** |
|
* v9fs_get_inode - helper function to setup an inode |
|
* @sb: superblock |
|
* @mode: mode to setup inode with |
|
* |
|
*/ |
|
|
|
struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev) |
|
{ |
|
int err; |
|
struct inode *inode; |
|
struct v9fs_session_info *v9ses = sb->s_fs_info; |
|
|
|
p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode); |
|
|
|
inode = new_inode(sb); |
|
if (!inode) { |
|
pr_warn("%s (%d): Problem allocating inode\n", |
|
__func__, task_pid_nr(current)); |
|
return ERR_PTR(-ENOMEM); |
|
} |
|
err = v9fs_init_inode(v9ses, inode, mode, rdev); |
|
if (err) { |
|
iput(inode); |
|
return ERR_PTR(err); |
|
} |
|
return inode; |
|
} |
|
|
|
/** |
|
* v9fs_clear_inode - release an inode |
|
* @inode: inode to release |
|
* |
|
*/ |
|
void v9fs_evict_inode(struct inode *inode) |
|
{ |
|
struct v9fs_inode *v9inode = V9FS_I(inode); |
|
|
|
truncate_inode_pages_final(&inode->i_data); |
|
clear_inode(inode); |
|
filemap_fdatawrite(&inode->i_data); |
|
|
|
v9fs_cache_inode_put_cookie(inode); |
|
/* clunk the fid stashed in writeback_fid */ |
|
if (v9inode->writeback_fid) { |
|
p9_client_clunk(v9inode->writeback_fid); |
|
v9inode->writeback_fid = NULL; |
|
} |
|
} |
|
|
|
static int v9fs_test_inode(struct inode *inode, void *data) |
|
{ |
|
int umode; |
|
dev_t rdev; |
|
struct v9fs_inode *v9inode = V9FS_I(inode); |
|
struct p9_wstat *st = (struct p9_wstat *)data; |
|
struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); |
|
|
|
umode = p9mode2unixmode(v9ses, st, &rdev); |
|
/* don't match inode of different type */ |
|
if (inode_wrong_type(inode, umode)) |
|
return 0; |
|
|
|
/* compare qid details */ |
|
if (memcmp(&v9inode->qid.version, |
|
&st->qid.version, sizeof(v9inode->qid.version))) |
|
return 0; |
|
|
|
if (v9inode->qid.type != st->qid.type) |
|
return 0; |
|
|
|
if (v9inode->qid.path != st->qid.path) |
|
return 0; |
|
return 1; |
|
} |
|
|
|
static int v9fs_test_new_inode(struct inode *inode, void *data) |
|
{ |
|
return 0; |
|
} |
|
|
|
static int v9fs_set_inode(struct inode *inode, void *data) |
|
{ |
|
struct v9fs_inode *v9inode = V9FS_I(inode); |
|
struct p9_wstat *st = (struct p9_wstat *)data; |
|
|
|
memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); |
|
return 0; |
|
} |
|
|
|
static struct inode *v9fs_qid_iget(struct super_block *sb, |
|
struct p9_qid *qid, |
|
struct p9_wstat *st, |
|
int new) |
|
{ |
|
dev_t rdev; |
|
int retval; |
|
umode_t umode; |
|
unsigned long i_ino; |
|
struct inode *inode; |
|
struct v9fs_session_info *v9ses = sb->s_fs_info; |
|
int (*test)(struct inode *, void *); |
|
|
|
if (new) |
|
test = v9fs_test_new_inode; |
|
else |
|
test = v9fs_test_inode; |
|
|
|
i_ino = v9fs_qid2ino(qid); |
|
inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st); |
|
if (!inode) |
|
return ERR_PTR(-ENOMEM); |
|
if (!(inode->i_state & I_NEW)) |
|
return inode; |
|
/* |
|
* initialize the inode with the stat info |
|
* FIXME!! we may need support for stale inodes |
|
* later. |
|
*/ |
|
inode->i_ino = i_ino; |
|
umode = p9mode2unixmode(v9ses, st, &rdev); |
|
retval = v9fs_init_inode(v9ses, inode, umode, rdev); |
|
if (retval) |
|
goto error; |
|
|
|
v9fs_stat2inode(st, inode, sb, 0); |
|
v9fs_cache_inode_get_cookie(inode); |
|
unlock_new_inode(inode); |
|
return inode; |
|
error: |
|
iget_failed(inode); |
|
return ERR_PTR(retval); |
|
|
|
} |
|
|
|
struct inode * |
|
v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, |
|
struct super_block *sb, int new) |
|
{ |
|
struct p9_wstat *st; |
|
struct inode *inode = NULL; |
|
|
|
st = p9_client_stat(fid); |
|
if (IS_ERR(st)) |
|
return ERR_CAST(st); |
|
|
|
inode = v9fs_qid_iget(sb, &st->qid, st, new); |
|
p9stat_free(st); |
|
kfree(st); |
|
return inode; |
|
} |
|
|
|
/** |
|
* v9fs_at_to_dotl_flags- convert Linux specific AT flags to |
|
* plan 9 AT flag. |
|
* @flags: flags to convert |
|
*/ |
|
static int v9fs_at_to_dotl_flags(int flags) |
|
{ |
|
int rflags = 0; |
|
if (flags & AT_REMOVEDIR) |
|
rflags |= P9_DOTL_AT_REMOVEDIR; |
|
return rflags; |
|
} |
|
|
|
/** |
|
* v9fs_dec_count - helper functon to drop i_nlink. |
|
* |
|
* If a directory had nlink <= 2 (including . and ..), then we should not drop |
|
* the link count, which indicates the underlying exported fs doesn't maintain |
|
* nlink accurately. e.g. |
|
* - overlayfs sets nlink to 1 for merged dir |
|
* - ext4 (with dir_nlink feature enabled) sets nlink to 1 if a dir has more |
|
* than EXT4_LINK_MAX (65000) links. |
|
* |
|
* @inode: inode whose nlink is being dropped |
|
*/ |
|
static void v9fs_dec_count(struct inode *inode) |
|
{ |
|
if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2) |
|
drop_nlink(inode); |
|
} |
|
|
|
/** |
|
* v9fs_remove - helper function to remove files and directories |
|
* @dir: directory inode that is being deleted |
|
* @dentry: dentry that is being deleted |
|
* @flags: removing a directory |
|
* |
|
*/ |
|
|
|
static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags) |
|
{ |
|
struct inode *inode; |
|
int retval = -EOPNOTSUPP; |
|
struct p9_fid *v9fid, *dfid; |
|
struct v9fs_session_info *v9ses; |
|
|
|
p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n", |
|
dir, dentry, flags); |
|
|
|
v9ses = v9fs_inode2v9ses(dir); |
|
inode = d_inode(dentry); |
|
dfid = v9fs_parent_fid(dentry); |
|
if (IS_ERR(dfid)) { |
|
retval = PTR_ERR(dfid); |
|
p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval); |
|
return retval; |
|
} |
|
if (v9fs_proto_dotl(v9ses)) |
|
retval = p9_client_unlinkat(dfid, dentry->d_name.name, |
|
v9fs_at_to_dotl_flags(flags)); |
|
p9_client_clunk(dfid); |
|
if (retval == -EOPNOTSUPP) { |
|
/* Try the one based on path */ |
|
v9fid = v9fs_fid_clone(dentry); |
|
if (IS_ERR(v9fid)) |
|
return PTR_ERR(v9fid); |
|
retval = p9_client_remove(v9fid); |
|
} |
|
if (!retval) { |
|
/* |
|
* directories on unlink should have zero |
|
* link count |
|
*/ |
|
if (flags & AT_REMOVEDIR) { |
|
clear_nlink(inode); |
|
v9fs_dec_count(dir); |
|
} else |
|
v9fs_dec_count(inode); |
|
|
|
v9fs_invalidate_inode_attr(inode); |
|
v9fs_invalidate_inode_attr(dir); |
|
|
|
/* invalidate all fids associated with dentry */ |
|
/* NOTE: This will not include open fids */ |
|
dentry->d_op->d_release(dentry); |
|
} |
|
return retval; |
|
} |
|
|
|
/** |
|
* v9fs_create - Create a file |
|
* @v9ses: session information |
|
* @dir: directory that dentry is being created in |
|
* @dentry: dentry that is being created |
|
* @extension: 9p2000.u extension string to support devices, etc. |
|
* @perm: create permissions |
|
* @mode: open mode |
|
* |
|
*/ |
|
static struct p9_fid * |
|
v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, |
|
struct dentry *dentry, char *extension, u32 perm, u8 mode) |
|
{ |
|
int err; |
|
const unsigned char *name; |
|
struct p9_fid *dfid, *ofid = NULL, *fid = NULL; |
|
struct inode *inode; |
|
|
|
p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); |
|
|
|
err = 0; |
|
name = dentry->d_name.name; |
|
dfid = v9fs_parent_fid(dentry); |
|
if (IS_ERR(dfid)) { |
|
err = PTR_ERR(dfid); |
|
p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); |
|
return ERR_PTR(err); |
|
} |
|
|
|
/* clone a fid to use for creation */ |
|
ofid = clone_fid(dfid); |
|
if (IS_ERR(ofid)) { |
|
err = PTR_ERR(ofid); |
|
p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
|
p9_client_clunk(dfid); |
|
return ERR_PTR(err); |
|
} |
|
|
|
err = p9_client_fcreate(ofid, name, perm, mode, extension); |
|
if (err < 0) { |
|
p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); |
|
p9_client_clunk(dfid); |
|
goto error; |
|
} |
|
|
|
if (!(perm & P9_DMLINK)) { |
|
/* now walk from the parent so we can get unopened fid */ |
|
fid = p9_client_walk(dfid, 1, &name, 1); |
|
if (IS_ERR(fid)) { |
|
err = PTR_ERR(fid); |
|
p9_debug(P9_DEBUG_VFS, |
|
"p9_client_walk failed %d\n", err); |
|
fid = NULL; |
|
p9_client_clunk(dfid); |
|
goto error; |
|
} |
|
/* |
|
* instantiate inode and assign the unopened fid to the dentry |
|
*/ |
|
inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); |
|
if (IS_ERR(inode)) { |
|
err = PTR_ERR(inode); |
|
p9_debug(P9_DEBUG_VFS, |
|
"inode creation failed %d\n", err); |
|
p9_client_clunk(dfid); |
|
goto error; |
|
} |
|
v9fs_fid_add(dentry, fid); |
|
d_instantiate(dentry, inode); |
|
} |
|
p9_client_clunk(dfid); |
|
return ofid; |
|
error: |
|
if (ofid) |
|
p9_client_clunk(ofid); |
|
|
|
if (fid) |
|
p9_client_clunk(fid); |
|
|
|
return ERR_PTR(err); |
|
} |
|
|
|
/** |
|
* v9fs_vfs_create - VFS hook to create a regular file |
|
* |
|
* open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called |
|
* for mknod(2). |
|
* |
|
* @dir: directory inode that is being created |
|
* @dentry: dentry that is being deleted |
|
* @mode: create permissions |
|
* |
|
*/ |
|
|
|
static int |
|
v9fs_vfs_create(struct user_namespace *mnt_userns, struct inode *dir, |
|
struct dentry *dentry, umode_t mode, bool excl) |
|
{ |
|
struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); |
|
u32 perm = unixmode2p9mode(v9ses, mode); |
|
struct p9_fid *fid; |
|
|
|
/* P9_OEXCL? */ |
|
fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR); |
|
if (IS_ERR(fid)) |
|
return PTR_ERR(fid); |
|
|
|
v9fs_invalidate_inode_attr(dir); |
|
p9_client_clunk(fid); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* v9fs_vfs_mkdir - VFS mkdir hook to create a directory |
|
* @dir: inode that is being unlinked |
|
* @dentry: dentry that is being unlinked |
|
* @mode: mode for new directory |
|
* |
|
*/ |
|
|
|
static int v9fs_vfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir, |
|
struct dentry *dentry, umode_t mode) |
|
{ |
|
int err; |
|
u32 perm; |
|
struct p9_fid *fid; |
|
struct v9fs_session_info *v9ses; |
|
|
|
p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); |
|
err = 0; |
|
v9ses = v9fs_inode2v9ses(dir); |
|
perm = unixmode2p9mode(v9ses, mode | S_IFDIR); |
|
fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); |
|
if (IS_ERR(fid)) { |
|
err = PTR_ERR(fid); |
|
fid = NULL; |
|
} else { |
|
inc_nlink(dir); |
|
v9fs_invalidate_inode_attr(dir); |
|
} |
|
|
|
if (fid) |
|
p9_client_clunk(fid); |
|
|
|
return err; |
|
} |
|
|
|
/** |
|
* v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode |
|
* @dir: inode that is being walked from |
|
* @dentry: dentry that is being walked to? |
|
* @flags: lookup flags (unused) |
|
* |
|
*/ |
|
|
|
struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, |
|
unsigned int flags) |
|
{ |
|
struct dentry *res; |
|
struct v9fs_session_info *v9ses; |
|
struct p9_fid *dfid, *fid; |
|
struct inode *inode; |
|
const unsigned char *name; |
|
|
|
p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n", |
|
dir, dentry, dentry, flags); |
|
|
|
if (dentry->d_name.len > NAME_MAX) |
|
return ERR_PTR(-ENAMETOOLONG); |
|
|
|
v9ses = v9fs_inode2v9ses(dir); |
|
/* We can walk d_parent because we hold the dir->i_mutex */ |
|
dfid = v9fs_parent_fid(dentry); |
|
if (IS_ERR(dfid)) |
|
return ERR_CAST(dfid); |
|
|
|
/* |
|
* Make sure we don't use a wrong inode due to parallel |
|
* unlink. For cached mode create calls request for new |
|
* inode. But with cache disabled, lookup should do this. |
|
*/ |
|
name = dentry->d_name.name; |
|
fid = p9_client_walk(dfid, 1, &name, 1); |
|
p9_client_clunk(dfid); |
|
if (fid == ERR_PTR(-ENOENT)) |
|
inode = NULL; |
|
else if (IS_ERR(fid)) |
|
inode = ERR_CAST(fid); |
|
else if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) |
|
inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb); |
|
else |
|
inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); |
|
/* |
|
* If we had a rename on the server and a parallel lookup |
|
* for the new name, then make sure we instantiate with |
|
* the new name. ie look up for a/b, while on server somebody |
|
* moved b under k and client parallely did a lookup for |
|
* k/b. |
|
*/ |
|
res = d_splice_alias(inode, dentry); |
|
if (!IS_ERR(fid)) { |
|
if (!res) |
|
v9fs_fid_add(dentry, fid); |
|
else if (!IS_ERR(res)) |
|
v9fs_fid_add(res, fid); |
|
else |
|
p9_client_clunk(fid); |
|
} |
|
return res; |
|
} |
|
|
|
static int |
|
v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry, |
|
struct file *file, unsigned flags, umode_t mode) |
|
{ |
|
int err; |
|
u32 perm; |
|
struct v9fs_inode *v9inode; |
|
struct v9fs_session_info *v9ses; |
|
struct p9_fid *fid, *inode_fid; |
|
struct dentry *res = NULL; |
|
struct inode *inode; |
|
|
|
if (d_in_lookup(dentry)) { |
|
res = v9fs_vfs_lookup(dir, dentry, 0); |
|
if (IS_ERR(res)) |
|
return PTR_ERR(res); |
|
|
|
if (res) |
|
dentry = res; |
|
} |
|
|
|
/* Only creates */ |
|
if (!(flags & O_CREAT) || d_really_is_positive(dentry)) |
|
return finish_no_open(file, res); |
|
|
|
err = 0; |
|
|
|
v9ses = v9fs_inode2v9ses(dir); |
|
perm = unixmode2p9mode(v9ses, mode); |
|
fid = v9fs_create(v9ses, dir, dentry, NULL, perm, |
|
v9fs_uflags2omode(flags, |
|
v9fs_proto_dotu(v9ses))); |
|
if (IS_ERR(fid)) { |
|
err = PTR_ERR(fid); |
|
fid = NULL; |
|
goto error; |
|
} |
|
|
|
v9fs_invalidate_inode_attr(dir); |
|
inode = d_inode(dentry); |
|
v9inode = V9FS_I(inode); |
|
mutex_lock(&v9inode->v_mutex); |
|
if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) && |
|
!v9inode->writeback_fid && |
|
((flags & O_ACCMODE) != O_RDONLY)) { |
|
/* |
|
* clone a fid and add it to writeback_fid |
|
* we do it during open time instead of |
|
* page dirty time via write_begin/page_mkwrite |
|
* because we want write after unlink usecase |
|
* to work. |
|
*/ |
|
inode_fid = v9fs_writeback_fid(dentry); |
|
if (IS_ERR(inode_fid)) { |
|
err = PTR_ERR(inode_fid); |
|
mutex_unlock(&v9inode->v_mutex); |
|
goto error; |
|
} |
|
v9inode->writeback_fid = (void *) inode_fid; |
|
} |
|
mutex_unlock(&v9inode->v_mutex); |
|
err = finish_open(file, dentry, generic_file_open); |
|
if (err) |
|
goto error; |
|
|
|
file->private_data = fid; |
|
if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) |
|
v9fs_cache_inode_set_cookie(d_inode(dentry), file); |
|
v9fs_open_fid_add(inode, fid); |
|
|
|
file->f_mode |= FMODE_CREATED; |
|
out: |
|
dput(res); |
|
return err; |
|
|
|
error: |
|
if (fid) |
|
p9_client_clunk(fid); |
|
goto out; |
|
} |
|
|
|
/** |
|
* v9fs_vfs_unlink - VFS unlink hook to delete an inode |
|
* @i: inode that is being unlinked |
|
* @d: dentry that is being unlinked |
|
* |
|
*/ |
|
|
|
int v9fs_vfs_unlink(struct inode *i, struct dentry *d) |
|
{ |
|
return v9fs_remove(i, d, 0); |
|
} |
|
|
|
/** |
|
* v9fs_vfs_rmdir - VFS unlink hook to delete a directory |
|
* @i: inode that is being unlinked |
|
* @d: dentry that is being unlinked |
|
* |
|
*/ |
|
|
|
int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) |
|
{ |
|
return v9fs_remove(i, d, AT_REMOVEDIR); |
|
} |
|
|
|
/** |
|
* v9fs_vfs_rename - VFS hook to rename an inode |
|
* @old_dir: old dir inode |
|
* @old_dentry: old dentry |
|
* @new_dir: new dir inode |
|
* @new_dentry: new dentry |
|
* |
|
*/ |
|
|
|
int |
|
v9fs_vfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir, |
|
struct dentry *old_dentry, struct inode *new_dir, |
|
struct dentry *new_dentry, unsigned int flags) |
|
{ |
|
int retval; |
|
struct inode *old_inode; |
|
struct inode *new_inode; |
|
struct v9fs_session_info *v9ses; |
|
struct p9_fid *oldfid, *dfid; |
|
struct p9_fid *olddirfid; |
|
struct p9_fid *newdirfid; |
|
struct p9_wstat wstat; |
|
|
|
if (flags) |
|
return -EINVAL; |
|
|
|
p9_debug(P9_DEBUG_VFS, "\n"); |
|
retval = 0; |
|
old_inode = d_inode(old_dentry); |
|
new_inode = d_inode(new_dentry); |
|
v9ses = v9fs_inode2v9ses(old_inode); |
|
oldfid = v9fs_fid_lookup(old_dentry); |
|
if (IS_ERR(oldfid)) |
|
return PTR_ERR(oldfid); |
|
|
|
dfid = v9fs_parent_fid(old_dentry); |
|
olddirfid = clone_fid(dfid); |
|
if (dfid && !IS_ERR(dfid)) |
|
p9_client_clunk(dfid); |
|
|
|
if (IS_ERR(olddirfid)) { |
|
retval = PTR_ERR(olddirfid); |
|
goto done; |
|
} |
|
|
|
dfid = v9fs_parent_fid(new_dentry); |
|
newdirfid = clone_fid(dfid); |
|
p9_client_clunk(dfid); |
|
|
|
if (IS_ERR(newdirfid)) { |
|
retval = PTR_ERR(newdirfid); |
|
goto clunk_olddir; |
|
} |
|
|
|
down_write(&v9ses->rename_sem); |
|
if (v9fs_proto_dotl(v9ses)) { |
|
retval = p9_client_renameat(olddirfid, old_dentry->d_name.name, |
|
newdirfid, new_dentry->d_name.name); |
|
if (retval == -EOPNOTSUPP) |
|
retval = p9_client_rename(oldfid, newdirfid, |
|
new_dentry->d_name.name); |
|
if (retval != -EOPNOTSUPP) |
|
goto clunk_newdir; |
|
} |
|
if (old_dentry->d_parent != new_dentry->d_parent) { |
|
/* |
|
* 9P .u can only handle file rename in the same directory |
|
*/ |
|
|
|
p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n"); |
|
retval = -EXDEV; |
|
goto clunk_newdir; |
|
} |
|
v9fs_blank_wstat(&wstat); |
|
wstat.muid = v9ses->uname; |
|
wstat.name = new_dentry->d_name.name; |
|
retval = p9_client_wstat(oldfid, &wstat); |
|
|
|
clunk_newdir: |
|
if (!retval) { |
|
if (new_inode) { |
|
if (S_ISDIR(new_inode->i_mode)) |
|
clear_nlink(new_inode); |
|
else |
|
v9fs_dec_count(new_inode); |
|
} |
|
if (S_ISDIR(old_inode->i_mode)) { |
|
if (!new_inode) |
|
inc_nlink(new_dir); |
|
v9fs_dec_count(old_dir); |
|
} |
|
v9fs_invalidate_inode_attr(old_inode); |
|
v9fs_invalidate_inode_attr(old_dir); |
|
v9fs_invalidate_inode_attr(new_dir); |
|
|
|
/* successful rename */ |
|
d_move(old_dentry, new_dentry); |
|
} |
|
up_write(&v9ses->rename_sem); |
|
p9_client_clunk(newdirfid); |
|
|
|
clunk_olddir: |
|
p9_client_clunk(olddirfid); |
|
|
|
done: |
|
p9_client_clunk(oldfid); |
|
return retval; |
|
} |
|
|
|
/** |
|
* v9fs_vfs_getattr - retrieve file metadata |
|
* @path: Object to query |
|
* @stat: metadata structure to populate |
|
* @request_mask: Mask of STATX_xxx flags indicating the caller's interests |
|
* @flags: AT_STATX_xxx setting |
|
* |
|
*/ |
|
|
|
static int |
|
v9fs_vfs_getattr(struct user_namespace *mnt_userns, const struct path *path, |
|
struct kstat *stat, u32 request_mask, unsigned int flags) |
|
{ |
|
struct dentry *dentry = path->dentry; |
|
struct v9fs_session_info *v9ses; |
|
struct p9_fid *fid; |
|
struct p9_wstat *st; |
|
|
|
p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); |
|
v9ses = v9fs_dentry2v9ses(dentry); |
|
if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { |
|
generic_fillattr(&init_user_ns, d_inode(dentry), stat); |
|
return 0; |
|
} |
|
fid = v9fs_fid_lookup(dentry); |
|
if (IS_ERR(fid)) |
|
return PTR_ERR(fid); |
|
|
|
st = p9_client_stat(fid); |
|
p9_client_clunk(fid); |
|
if (IS_ERR(st)) |
|
return PTR_ERR(st); |
|
|
|
v9fs_stat2inode(st, d_inode(dentry), dentry->d_sb, 0); |
|
generic_fillattr(&init_user_ns, d_inode(dentry), stat); |
|
|
|
p9stat_free(st); |
|
kfree(st); |
|
return 0; |
|
} |
|
|
|
/** |
|
* v9fs_vfs_setattr - set file metadata |
|
* @dentry: file whose metadata to set |
|
* @iattr: metadata assignment structure |
|
* |
|
*/ |
|
|
|
static int v9fs_vfs_setattr(struct user_namespace *mnt_userns, |
|
struct dentry *dentry, struct iattr *iattr) |
|
{ |
|
int retval, use_dentry = 0; |
|
struct v9fs_session_info *v9ses; |
|
struct p9_fid *fid = NULL; |
|
struct p9_wstat wstat; |
|
|
|
p9_debug(P9_DEBUG_VFS, "\n"); |
|
retval = setattr_prepare(&init_user_ns, dentry, iattr); |
|
if (retval) |
|
return retval; |
|
|
|
retval = -EPERM; |
|
v9ses = v9fs_dentry2v9ses(dentry); |
|
if (iattr->ia_valid & ATTR_FILE) { |
|
fid = iattr->ia_file->private_data; |
|
WARN_ON(!fid); |
|
} |
|
if (!fid) { |
|
fid = v9fs_fid_lookup(dentry); |
|
use_dentry = 1; |
|
} |
|
if(IS_ERR(fid)) |
|
return PTR_ERR(fid); |
|
|
|
v9fs_blank_wstat(&wstat); |
|
if (iattr->ia_valid & ATTR_MODE) |
|
wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); |
|
|
|
if (iattr->ia_valid & ATTR_MTIME) |
|
wstat.mtime = iattr->ia_mtime.tv_sec; |
|
|
|
if (iattr->ia_valid & ATTR_ATIME) |
|
wstat.atime = iattr->ia_atime.tv_sec; |
|
|
|
if (iattr->ia_valid & ATTR_SIZE) |
|
wstat.length = iattr->ia_size; |
|
|
|
if (v9fs_proto_dotu(v9ses)) { |
|
if (iattr->ia_valid & ATTR_UID) |
|
wstat.n_uid = iattr->ia_uid; |
|
|
|
if (iattr->ia_valid & ATTR_GID) |
|
wstat.n_gid = iattr->ia_gid; |
|
} |
|
|
|
/* Write all dirty data */ |
|
if (d_is_reg(dentry)) |
|
filemap_write_and_wait(d_inode(dentry)->i_mapping); |
|
|
|
retval = p9_client_wstat(fid, &wstat); |
|
|
|
if (use_dentry) |
|
p9_client_clunk(fid); |
|
|
|
if (retval < 0) |
|
return retval; |
|
|
|
if ((iattr->ia_valid & ATTR_SIZE) && |
|
iattr->ia_size != i_size_read(d_inode(dentry))) |
|
truncate_setsize(d_inode(dentry), iattr->ia_size); |
|
|
|
v9fs_invalidate_inode_attr(d_inode(dentry)); |
|
|
|
setattr_copy(&init_user_ns, d_inode(dentry), iattr); |
|
mark_inode_dirty(d_inode(dentry)); |
|
return 0; |
|
} |
|
|
|
/** |
|
* v9fs_stat2inode - populate an inode structure with mistat info |
|
* @stat: Plan 9 metadata (mistat) structure |
|
* @inode: inode to populate |
|
* @sb: superblock of filesystem |
|
* @flags: control flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE) |
|
* |
|
*/ |
|
|
|
void |
|
v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, |
|
struct super_block *sb, unsigned int flags) |
|
{ |
|
umode_t mode; |
|
struct v9fs_session_info *v9ses = sb->s_fs_info; |
|
struct v9fs_inode *v9inode = V9FS_I(inode); |
|
|
|
set_nlink(inode, 1); |
|
|
|
inode->i_atime.tv_sec = stat->atime; |
|
inode->i_mtime.tv_sec = stat->mtime; |
|
inode->i_ctime.tv_sec = stat->mtime; |
|
|
|
inode->i_uid = v9ses->dfltuid; |
|
inode->i_gid = v9ses->dfltgid; |
|
|
|
if (v9fs_proto_dotu(v9ses)) { |
|
inode->i_uid = stat->n_uid; |
|
inode->i_gid = stat->n_gid; |
|
} |
|
if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { |
|
if (v9fs_proto_dotu(v9ses)) { |
|
unsigned int i_nlink; |
|
/* |
|
* Hadlink support got added later to the .u extension. |
|
* So there can be a server out there that doesn't |
|
* support this even with .u extension. That would |
|
* just leave us with stat->extension being an empty |
|
* string, though. |
|
*/ |
|
/* HARDLINKCOUNT %u */ |
|
if (sscanf(stat->extension, |
|
" HARDLINKCOUNT %u", &i_nlink) == 1) |
|
set_nlink(inode, i_nlink); |
|
} |
|
} |
|
mode = p9mode2perm(v9ses, stat); |
|
mode |= inode->i_mode & ~S_IALLUGO; |
|
inode->i_mode = mode; |
|
|
|
if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE)) |
|
v9fs_i_size_write(inode, stat->length); |
|
/* not real number of blocks, but 512 byte ones ... */ |
|
inode->i_blocks = (stat->length + 512 - 1) >> 9; |
|
v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; |
|
} |
|
|
|
/** |
|
* v9fs_qid2ino - convert qid into inode number |
|
* @qid: qid to hash |
|
* |
|
* BUG: potential for inode number collisions? |
|
*/ |
|
|
|
ino_t v9fs_qid2ino(struct p9_qid *qid) |
|
{ |
|
u64 path = qid->path + 2; |
|
ino_t i = 0; |
|
|
|
if (sizeof(ino_t) == sizeof(path)) |
|
memcpy(&i, &path, sizeof(ino_t)); |
|
else |
|
i = (ino_t) (path ^ (path >> 32)); |
|
|
|
return i; |
|
} |
|
|
|
/** |
|
* v9fs_vfs_get_link - follow a symlink path |
|
* @dentry: dentry for symlink |
|
* @inode: inode for symlink |
|
* @done: delayed call for when we are done with the return value |
|
*/ |
|
|
|
static const char *v9fs_vfs_get_link(struct dentry *dentry, |
|
struct inode *inode, |
|
struct delayed_call *done) |
|
{ |
|
struct v9fs_session_info *v9ses; |
|
struct p9_fid *fid; |
|
struct p9_wstat *st; |
|
char *res; |
|
|
|
if (!dentry) |
|
return ERR_PTR(-ECHILD); |
|
|
|
v9ses = v9fs_dentry2v9ses(dentry); |
|
fid = v9fs_fid_lookup(dentry); |
|
p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); |
|
|
|
if (IS_ERR(fid)) |
|
return ERR_CAST(fid); |
|
|
|
if (!v9fs_proto_dotu(v9ses)) |
|
return ERR_PTR(-EBADF); |
|
|
|
st = p9_client_stat(fid); |
|
p9_client_clunk(fid); |
|
if (IS_ERR(st)) |
|
return ERR_CAST(st); |
|
|
|
if (!(st->mode & P9_DMSYMLINK)) { |
|
p9stat_free(st); |
|
kfree(st); |
|
return ERR_PTR(-EINVAL); |
|
} |
|
res = st->extension; |
|
st->extension = NULL; |
|
if (strlen(res) >= PATH_MAX) |
|
res[PATH_MAX - 1] = '\0'; |
|
|
|
p9stat_free(st); |
|
kfree(st); |
|
set_delayed_call(done, kfree_link, res); |
|
return res; |
|
} |
|
|
|
/** |
|
* v9fs_vfs_mkspecial - create a special file |
|
* @dir: inode to create special file in |
|
* @dentry: dentry to create |
|
* @perm: mode to create special file |
|
* @extension: 9p2000.u format extension string representing special file |
|
* |
|
*/ |
|
|
|
static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, |
|
u32 perm, const char *extension) |
|
{ |
|
struct p9_fid *fid; |
|
struct v9fs_session_info *v9ses; |
|
|
|
v9ses = v9fs_inode2v9ses(dir); |
|
if (!v9fs_proto_dotu(v9ses)) { |
|
p9_debug(P9_DEBUG_ERROR, "not extended\n"); |
|
return -EPERM; |
|
} |
|
|
|
fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, |
|
P9_OREAD); |
|
if (IS_ERR(fid)) |
|
return PTR_ERR(fid); |
|
|
|
v9fs_invalidate_inode_attr(dir); |
|
p9_client_clunk(fid); |
|
return 0; |
|
} |
|
|
|
/** |
|
* v9fs_vfs_symlink - helper function to create symlinks |
|
* @dir: directory inode containing symlink |
|
* @dentry: dentry for symlink |
|
* @symname: symlink data |
|
* |
|
* See Also: 9P2000.u RFC for more information |
|
* |
|
*/ |
|
|
|
static int |
|
v9fs_vfs_symlink(struct user_namespace *mnt_userns, struct inode *dir, |
|
struct dentry *dentry, const char *symname) |
|
{ |
|
p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n", |
|
dir->i_ino, dentry, symname); |
|
|
|
return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname); |
|
} |
|
|
|
#define U32_MAX_DIGITS 10 |
|
|
|
/** |
|
* v9fs_vfs_link - create a hardlink |
|
* @old_dentry: dentry for file to link to |
|
* @dir: inode destination for new link |
|
* @dentry: dentry for link |
|
* |
|
*/ |
|
|
|
static int |
|
v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, |
|
struct dentry *dentry) |
|
{ |
|
int retval; |
|
char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */ |
|
struct p9_fid *oldfid; |
|
|
|
p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n", |
|
dir->i_ino, dentry, old_dentry); |
|
|
|
oldfid = v9fs_fid_clone(old_dentry); |
|
if (IS_ERR(oldfid)) |
|
return PTR_ERR(oldfid); |
|
|
|
sprintf(name, "%d\n", oldfid->fid); |
|
retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); |
|
if (!retval) { |
|
v9fs_refresh_inode(oldfid, d_inode(old_dentry)); |
|
v9fs_invalidate_inode_attr(dir); |
|
} |
|
p9_client_clunk(oldfid); |
|
return retval; |
|
} |
|
|
|
/** |
|
* v9fs_vfs_mknod - create a special file |
|
* @dir: inode destination for new link |
|
* @dentry: dentry for file |
|
* @mode: mode for creation |
|
* @rdev: device associated with special file |
|
* |
|
*/ |
|
|
|
static int |
|
v9fs_vfs_mknod(struct user_namespace *mnt_userns, struct inode *dir, |
|
struct dentry *dentry, umode_t mode, dev_t rdev) |
|
{ |
|
struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); |
|
int retval; |
|
char name[2 + U32_MAX_DIGITS + 1 + U32_MAX_DIGITS + 1]; |
|
u32 perm; |
|
|
|
p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n", |
|
dir->i_ino, dentry, mode, |
|
MAJOR(rdev), MINOR(rdev)); |
|
|
|
/* build extension */ |
|
if (S_ISBLK(mode)) |
|
sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); |
|
else if (S_ISCHR(mode)) |
|
sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); |
|
else |
|
*name = 0; |
|
|
|
perm = unixmode2p9mode(v9ses, mode); |
|
retval = v9fs_vfs_mkspecial(dir, dentry, perm, name); |
|
|
|
return retval; |
|
} |
|
|
|
int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode) |
|
{ |
|
int umode; |
|
dev_t rdev; |
|
struct p9_wstat *st; |
|
struct v9fs_session_info *v9ses; |
|
unsigned int flags; |
|
|
|
v9ses = v9fs_inode2v9ses(inode); |
|
st = p9_client_stat(fid); |
|
if (IS_ERR(st)) |
|
return PTR_ERR(st); |
|
/* |
|
* Don't update inode if the file type is different |
|
*/ |
|
umode = p9mode2unixmode(v9ses, st, &rdev); |
|
if (inode_wrong_type(inode, umode)) |
|
goto out; |
|
|
|
/* |
|
* We don't want to refresh inode->i_size, |
|
* because we may have cached data |
|
*/ |
|
flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ? |
|
V9FS_STAT2INODE_KEEP_ISIZE : 0; |
|
v9fs_stat2inode(st, inode, inode->i_sb, flags); |
|
out: |
|
p9stat_free(st); |
|
kfree(st); |
|
return 0; |
|
} |
|
|
|
static const struct inode_operations v9fs_dir_inode_operations_dotu = { |
|
.create = v9fs_vfs_create, |
|
.lookup = v9fs_vfs_lookup, |
|
.atomic_open = v9fs_vfs_atomic_open, |
|
.symlink = v9fs_vfs_symlink, |
|
.link = v9fs_vfs_link, |
|
.unlink = v9fs_vfs_unlink, |
|
.mkdir = v9fs_vfs_mkdir, |
|
.rmdir = v9fs_vfs_rmdir, |
|
.mknod = v9fs_vfs_mknod, |
|
.rename = v9fs_vfs_rename, |
|
.getattr = v9fs_vfs_getattr, |
|
.setattr = v9fs_vfs_setattr, |
|
}; |
|
|
|
static const struct inode_operations v9fs_dir_inode_operations = { |
|
.create = v9fs_vfs_create, |
|
.lookup = v9fs_vfs_lookup, |
|
.atomic_open = v9fs_vfs_atomic_open, |
|
.unlink = v9fs_vfs_unlink, |
|
.mkdir = v9fs_vfs_mkdir, |
|
.rmdir = v9fs_vfs_rmdir, |
|
.mknod = v9fs_vfs_mknod, |
|
.rename = v9fs_vfs_rename, |
|
.getattr = v9fs_vfs_getattr, |
|
.setattr = v9fs_vfs_setattr, |
|
}; |
|
|
|
static const struct inode_operations v9fs_file_inode_operations = { |
|
.getattr = v9fs_vfs_getattr, |
|
.setattr = v9fs_vfs_setattr, |
|
}; |
|
|
|
static const struct inode_operations v9fs_symlink_inode_operations = { |
|
.get_link = v9fs_vfs_get_link, |
|
.getattr = v9fs_vfs_getattr, |
|
.setattr = v9fs_vfs_setattr, |
|
}; |
|
|
|
|