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linux/fs/9p/vfs_inode_dotl.c
Dominique Martinet be2ca38253 Revert "fs/9p: simplify iget to remove unnecessary paths" 
This reverts commit 724a08450f.

This code simplification introduced significant regressions on servers
that do not remap inode numbers when exporting multiple underlying
filesystems with colliding inodes, as can be illustrated with simple
tmpfs exports in qemu with remapping disabled:
```
# host side
cd /tmp/linux-test
mkdir m1 m2
mount -t tmpfs tmpfs m1
mount -t tmpfs tmpfs m2
mkdir m1/dir m2/dir
echo foo > m1/dir/foo
echo bar > m2/dir/bar

# guest side
# started with -virtfs local,path=/tmp/linux-test,mount_tag=tmp,security_model=mapped-file
mount -t 9p -o trans=virtio,debug=1 tmp /mnt/t

ls /mnt/t/m1/dir
# foo
ls /mnt/t/m2/dir
# bar (works ok if directry isn't open)

# cd to keep first dir's inode alive
cd /mnt/t/m1/dir
ls /mnt/t/m2/dir
# foo (should be bar)
```
Other examples can be crafted with regular files with fscache enabled,
in which case I/Os just happen to the wrong file leading to
corruptions, or guest failing to boot with:
  | VFS: Lookup of 'com.android.runtime' in 9p 9p would have caused loop

In theory, we'd want the servers to be smart enough and ensure they
never send us two different files with the same 'qid.path', but while
qemu has an option to remap that is recommended (and qemu prints a
warning if this case happens), there are many other servers which do
not (kvmtool, nfs-ganesha, probably diod...), we should at least ensure
we don't cause regressions on this:
- assume servers can't be trusted and operations that should get a 'new'
inode properly do so. commit d05dcfdf5e (" fs/9p: mitigate inode
collisions") attempted to do this, but v9fs_fid_iget_dotl() was not
called so some higher level of caching got in the way; this needs to be
fixed properly before we can re-apply the patches.
- if we ever want to really simplify this code, we will need to add some
negotiation with the server at mount time where the server could claim
they handle this properly, at which point we could optimize this out.
(but that might not be needed at all if we properly handle the 'new'
check?)

Fixes: 724a08450f ("fs/9p: simplify iget to remove unnecessary paths")
Reported-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/all/20240408141436.GA17022@redhat.com/
Link: https://lkml.kernel.org/r/20240923100508.GA32066@willie-the-truck
Cc: stable@vger.kernel.org # v6.9+
Message-ID: <20241024-revert_iget-v1-4-4cac63d25f72@codewreck.org>
Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
2024-10-25 06:26:09 +09:00

954 lines
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// SPDX-License-Identifier: GPL-2.0-only
/*
* This file contains vfs inode ops for the 9P2000.L protocol.
*
* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
*/
#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/namei.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 int
v9fs_vfs_mknod_dotl(struct mnt_idmap *idmap, struct inode *dir,
struct dentry *dentry, umode_t omode, dev_t rdev);
/**
* v9fs_get_fsgid_for_create - Helper function to get the gid for a new object
* @dir_inode: The directory inode
*
* Helper function to get the gid for creating a
* new file system object. This checks the S_ISGID to determine the owning
* group of the new file system object.
*/
static kgid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
{
BUG_ON(dir_inode == NULL);
if (dir_inode->i_mode & S_ISGID) {
/* set_gid bit is set.*/
return dir_inode->i_gid;
}
return current_fsgid();
}
static int v9fs_test_inode_dotl(struct inode *inode, void *data)
{
struct v9fs_inode *v9inode = V9FS_I(inode);
struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
/* don't match inode of different type */
if (inode_wrong_type(inode, st->st_mode))
return 0;
if (inode->i_generation != st->st_gen)
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;
}
/* Always get a new inode */
static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)
{
return 0;
}
static int v9fs_set_inode_dotl(struct inode *inode, void *data)
{
struct v9fs_inode *v9inode = V9FS_I(inode);
struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
inode->i_generation = st->st_gen;
return 0;
}
static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
struct p9_qid *qid,
struct p9_fid *fid,
struct p9_stat_dotl *st,
int new)
{
int retval;
struct inode *inode;
struct v9fs_session_info *v9ses = sb->s_fs_info;
int (*test)(struct inode *inode, void *data);
if (new)
test = v9fs_test_new_inode_dotl;
else
test = v9fs_test_inode_dotl;
inode = iget5_locked(sb, QID2INO(qid), test, v9fs_set_inode_dotl, 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 = QID2INO(qid);
retval = v9fs_init_inode(v9ses, inode,
st->st_mode, new_decode_dev(st->st_rdev));
if (retval)
goto error;
v9fs_stat2inode_dotl(st, inode, 0);
v9fs_set_netfs_context(inode);
v9fs_cache_inode_get_cookie(inode);
retval = v9fs_get_acl(inode, fid);
if (retval)
goto error;
unlock_new_inode(inode);
return inode;
error:
iget_failed(inode);
return ERR_PTR(retval);
}
struct inode *
v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
struct super_block *sb, int new)
{
struct p9_stat_dotl *st;
struct inode *inode = NULL;
st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
if (IS_ERR(st))
return ERR_CAST(st);
inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
kfree(st);
return inode;
}
struct dotl_openflag_map {
int open_flag;
int dotl_flag;
};
static int v9fs_mapped_dotl_flags(int flags)
{
int i;
int rflags = 0;
struct dotl_openflag_map dotl_oflag_map[] = {
{ O_CREAT, P9_DOTL_CREATE },
{ O_EXCL, P9_DOTL_EXCL },
{ O_NOCTTY, P9_DOTL_NOCTTY },
{ O_APPEND, P9_DOTL_APPEND },
{ O_NONBLOCK, P9_DOTL_NONBLOCK },
{ O_DSYNC, P9_DOTL_DSYNC },
{ FASYNC, P9_DOTL_FASYNC },
{ O_DIRECT, P9_DOTL_DIRECT },
{ O_LARGEFILE, P9_DOTL_LARGEFILE },
{ O_DIRECTORY, P9_DOTL_DIRECTORY },
{ O_NOFOLLOW, P9_DOTL_NOFOLLOW },
{ O_NOATIME, P9_DOTL_NOATIME },
{ O_CLOEXEC, P9_DOTL_CLOEXEC },
{ O_SYNC, P9_DOTL_SYNC},
};
for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
if (flags & dotl_oflag_map[i].open_flag)
rflags |= dotl_oflag_map[i].dotl_flag;
}
return rflags;
}
/**
* v9fs_open_to_dotl_flags- convert Linux specific open flags to
* plan 9 open flag.
* @flags: flags to convert
*/
int v9fs_open_to_dotl_flags(int flags)
{
int rflags = 0;
/*
* We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
* and P9_DOTL_NOACCESS
*/
rflags |= flags & O_ACCMODE;
rflags |= v9fs_mapped_dotl_flags(flags);
return rflags;
}
/**
* v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
* @idmap: The user namespace of the mount
* @dir: directory inode that is being created
* @dentry: dentry that is being deleted
* @omode: create permissions
* @excl: True if the file must not yet exist
*
*/
static int
v9fs_vfs_create_dotl(struct mnt_idmap *idmap, struct inode *dir,
struct dentry *dentry, umode_t omode, bool excl)
{
return v9fs_vfs_mknod_dotl(idmap, dir, dentry, omode, 0);
}
static int
v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
struct file *file, unsigned int flags, umode_t omode)
{
int err = 0;
kgid_t gid;
umode_t mode;
int p9_omode = v9fs_open_to_dotl_flags(flags);
const unsigned char *name = NULL;
struct p9_qid qid;
struct inode *inode;
struct p9_fid *fid = NULL;
struct p9_fid *dfid = NULL, *ofid = NULL;
struct v9fs_session_info *v9ses;
struct posix_acl *pacl = NULL, *dacl = NULL;
struct dentry *res = NULL;
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);
v9ses = v9fs_inode2v9ses(dir);
name = dentry->d_name.name;
p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%x\n",
name, flags, omode);
dfid = v9fs_parent_fid(dentry);
if (IS_ERR(dfid)) {
err = PTR_ERR(dfid);
p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
goto out;
}
/* 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);
goto out;
}
gid = v9fs_get_fsgid_for_create(dir);
mode = omode;
/* Update mode based on ACL value */
err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
if (err) {
p9_debug(P9_DEBUG_VFS, "Failed to get acl values in create %d\n",
err);
goto out;
}
if ((v9ses->cache & CACHE_WRITEBACK) && (p9_omode & P9_OWRITE)) {
p9_omode = (p9_omode & ~P9_OWRITE) | P9_ORDWR;
p9_debug(P9_DEBUG_CACHE,
"write-only file with writeback enabled, creating w/ O_RDWR\n");
}
err = p9_client_create_dotl(ofid, name, p9_omode, mode, gid, &qid);
if (err < 0) {
p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in create %d\n",
err);
goto out;
}
v9fs_invalidate_inode_attr(dir);
/* instantiate inode and assign the unopened fid to the dentry */
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);
goto out;
}
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);
goto out;
}
/* Now set the ACL based on the default value */
v9fs_set_create_acl(inode, fid, dacl, pacl);
v9fs_fid_add(dentry, &fid);
d_instantiate(dentry, inode);
/* Since we are opening a file, assign the open fid to the file */
err = finish_open(file, dentry, generic_file_open);
if (err)
goto out;
file->private_data = ofid;
#ifdef CONFIG_9P_FSCACHE
if (v9ses->cache & CACHE_FSCACHE) {
struct v9fs_inode *v9inode = V9FS_I(inode);
fscache_use_cookie(v9fs_inode_cookie(v9inode),
file->f_mode & FMODE_WRITE);
}
#endif
v9fs_fid_add_modes(ofid, v9ses->flags, v9ses->cache, flags);
v9fs_open_fid_add(inode, &ofid);
file->f_mode |= FMODE_CREATED;
out:
p9_fid_put(dfid);
p9_fid_put(ofid);
p9_fid_put(fid);
v9fs_put_acl(dacl, pacl);
dput(res);
return err;
}
/**
* v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
* @idmap: The idmap of the mount
* @dir: inode that is being unlinked
* @dentry: dentry that is being unlinked
* @omode: mode for new directory
*
*/
static int v9fs_vfs_mkdir_dotl(struct mnt_idmap *idmap,
struct inode *dir, struct dentry *dentry,
umode_t omode)
{
int err;
struct v9fs_session_info *v9ses;
struct p9_fid *fid = NULL, *dfid = NULL;
kgid_t gid;
const unsigned char *name;
umode_t mode;
struct inode *inode;
struct p9_qid qid;
struct posix_acl *dacl = NULL, *pacl = NULL;
p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
v9ses = v9fs_inode2v9ses(dir);
omode |= S_IFDIR;
if (dir->i_mode & S_ISGID)
omode |= S_ISGID;
dfid = v9fs_parent_fid(dentry);
if (IS_ERR(dfid)) {
err = PTR_ERR(dfid);
p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
goto error;
}
gid = v9fs_get_fsgid_for_create(dir);
mode = omode;
/* Update mode based on ACL value */
err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
if (err) {
p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
err);
goto error;
}
name = dentry->d_name.name;
err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
if (err < 0)
goto error;
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);
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);
goto error;
}
v9fs_fid_add(dentry, &fid);
v9fs_set_create_acl(inode, fid, dacl, pacl);
d_instantiate(dentry, inode);
err = 0;
inc_nlink(dir);
v9fs_invalidate_inode_attr(dir);
error:
p9_fid_put(fid);
v9fs_put_acl(dacl, pacl);
p9_fid_put(dfid);
return err;
}
static int
v9fs_vfs_getattr_dotl(struct mnt_idmap *idmap,
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 inode *inode = d_inode(dentry);
struct p9_stat_dotl *st;
p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
v9ses = v9fs_dentry2v9ses(dentry);
if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) {
generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
return 0;
} else if (v9ses->cache) {
if (S_ISREG(inode->i_mode)) {
int retval = filemap_fdatawrite(inode->i_mapping);
if (retval)
p9_debug(P9_DEBUG_ERROR,
"flushing writeback during getattr returned %d\n", retval);
}
}
fid = v9fs_fid_lookup(dentry);
if (IS_ERR(fid))
return PTR_ERR(fid);
/* Ask for all the fields in stat structure. Server will return
* whatever it supports
*/
st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
p9_fid_put(fid);
if (IS_ERR(st))
return PTR_ERR(st);
v9fs_stat2inode_dotl(st, d_inode(dentry), 0);
generic_fillattr(&nop_mnt_idmap, request_mask, d_inode(dentry), stat);
/* Change block size to what the server returned */
stat->blksize = st->st_blksize;
kfree(st);
return 0;
}
/*
* Attribute flags.
*/
#define P9_ATTR_MODE (1 << 0)
#define P9_ATTR_UID (1 << 1)
#define P9_ATTR_GID (1 << 2)
#define P9_ATTR_SIZE (1 << 3)
#define P9_ATTR_ATIME (1 << 4)
#define P9_ATTR_MTIME (1 << 5)
#define P9_ATTR_CTIME (1 << 6)
#define P9_ATTR_ATIME_SET (1 << 7)
#define P9_ATTR_MTIME_SET (1 << 8)
struct dotl_iattr_map {
int iattr_valid;
int p9_iattr_valid;
};
static int v9fs_mapped_iattr_valid(int iattr_valid)
{
int i;
int p9_iattr_valid = 0;
struct dotl_iattr_map dotl_iattr_map[] = {
{ ATTR_MODE, P9_ATTR_MODE },
{ ATTR_UID, P9_ATTR_UID },
{ ATTR_GID, P9_ATTR_GID },
{ ATTR_SIZE, P9_ATTR_SIZE },
{ ATTR_ATIME, P9_ATTR_ATIME },
{ ATTR_MTIME, P9_ATTR_MTIME },
{ ATTR_CTIME, P9_ATTR_CTIME },
{ ATTR_ATIME_SET, P9_ATTR_ATIME_SET },
{ ATTR_MTIME_SET, P9_ATTR_MTIME_SET },
};
for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
if (iattr_valid & dotl_iattr_map[i].iattr_valid)
p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
}
return p9_iattr_valid;
}
/**
* v9fs_vfs_setattr_dotl - set file metadata
* @idmap: idmap of the mount
* @dentry: file whose metadata to set
* @iattr: metadata assignment structure
*
*/
int v9fs_vfs_setattr_dotl(struct mnt_idmap *idmap,
struct dentry *dentry, struct iattr *iattr)
{
int retval, use_dentry = 0;
struct inode *inode = d_inode(dentry);
struct v9fs_session_info __maybe_unused *v9ses;
struct p9_fid *fid = NULL;
struct p9_iattr_dotl p9attr = {
.uid = INVALID_UID,
.gid = INVALID_GID,
};
p9_debug(P9_DEBUG_VFS, "\n");
retval = setattr_prepare(&nop_mnt_idmap, dentry, iattr);
if (retval)
return retval;
v9ses = v9fs_dentry2v9ses(dentry);
p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
if (iattr->ia_valid & ATTR_MODE)
p9attr.mode = iattr->ia_mode;
if (iattr->ia_valid & ATTR_UID)
p9attr.uid = iattr->ia_uid;
if (iattr->ia_valid & ATTR_GID)
p9attr.gid = iattr->ia_gid;
if (iattr->ia_valid & ATTR_SIZE)
p9attr.size = iattr->ia_size;
if (iattr->ia_valid & ATTR_ATIME_SET) {
p9attr.atime_sec = iattr->ia_atime.tv_sec;
p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
}
if (iattr->ia_valid & ATTR_MTIME_SET) {
p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
}
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);
/* Write all dirty data */
if (S_ISREG(inode->i_mode)) {
retval = filemap_fdatawrite(inode->i_mapping);
if (retval < 0)
p9_debug(P9_DEBUG_ERROR,
"Flushing file prior to setattr failed: %d\n", retval);
}
retval = p9_client_setattr(fid, &p9attr);
if (retval < 0) {
if (use_dentry)
p9_fid_put(fid);
return retval;
}
if ((iattr->ia_valid & ATTR_SIZE) && iattr->ia_size !=
i_size_read(inode)) {
truncate_setsize(inode, iattr->ia_size);
netfs_resize_file(netfs_inode(inode), iattr->ia_size, true);
#ifdef CONFIG_9P_FSCACHE
if (v9ses->cache & CACHE_FSCACHE)
fscache_resize_cookie(v9fs_inode_cookie(V9FS_I(inode)),
iattr->ia_size);
#endif
}
v9fs_invalidate_inode_attr(inode);
setattr_copy(&nop_mnt_idmap, inode, iattr);
mark_inode_dirty(inode);
if (iattr->ia_valid & ATTR_MODE) {
/* We also want to update ACL when we update mode bits */
retval = v9fs_acl_chmod(inode, fid);
if (retval < 0) {
if (use_dentry)
p9_fid_put(fid);
return retval;
}
}
if (use_dentry)
p9_fid_put(fid);
return 0;
}
/**
* v9fs_stat2inode_dotl - populate an inode structure with stat info
* @stat: stat structure
* @inode: inode to populate
* @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
*
*/
void
v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode,
unsigned int flags)
{
umode_t mode;
struct v9fs_inode *v9inode = V9FS_I(inode);
if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
inode_set_atime(inode, stat->st_atime_sec,
stat->st_atime_nsec);
inode_set_mtime(inode, stat->st_mtime_sec,
stat->st_mtime_nsec);
inode_set_ctime(inode, stat->st_ctime_sec,
stat->st_ctime_nsec);
inode->i_uid = stat->st_uid;
inode->i_gid = stat->st_gid;
set_nlink(inode, stat->st_nlink);
mode = stat->st_mode & S_IALLUGO;
mode |= inode->i_mode & ~S_IALLUGO;
inode->i_mode = mode;
v9inode->netfs.remote_i_size = stat->st_size;
if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
v9fs_i_size_write(inode, stat->st_size);
inode->i_blocks = stat->st_blocks;
} else {
if (stat->st_result_mask & P9_STATS_ATIME) {
inode_set_atime(inode, stat->st_atime_sec,
stat->st_atime_nsec);
}
if (stat->st_result_mask & P9_STATS_MTIME) {
inode_set_mtime(inode, stat->st_mtime_sec,
stat->st_mtime_nsec);
}
if (stat->st_result_mask & P9_STATS_CTIME) {
inode_set_ctime(inode, stat->st_ctime_sec,
stat->st_ctime_nsec);
}
if (stat->st_result_mask & P9_STATS_UID)
inode->i_uid = stat->st_uid;
if (stat->st_result_mask & P9_STATS_GID)
inode->i_gid = stat->st_gid;
if (stat->st_result_mask & P9_STATS_NLINK)
set_nlink(inode, stat->st_nlink);
if (stat->st_result_mask & P9_STATS_MODE) {
mode = stat->st_mode & S_IALLUGO;
mode |= inode->i_mode & ~S_IALLUGO;
inode->i_mode = mode;
}
if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) &&
stat->st_result_mask & P9_STATS_SIZE) {
v9inode->netfs.remote_i_size = stat->st_size;
v9fs_i_size_write(inode, stat->st_size);
}
if (stat->st_result_mask & P9_STATS_BLOCKS)
inode->i_blocks = stat->st_blocks;
}
if (stat->st_result_mask & P9_STATS_GEN)
inode->i_generation = stat->st_gen;
/* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
* because the inode structure does not have fields for them.
*/
v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
}
static int
v9fs_vfs_symlink_dotl(struct mnt_idmap *idmap, struct inode *dir,
struct dentry *dentry, const char *symname)
{
int err;
kgid_t gid;
const unsigned char *name;
struct p9_qid qid;
struct p9_fid *dfid;
struct p9_fid *fid = NULL;
name = dentry->d_name.name;
p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
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;
}
gid = v9fs_get_fsgid_for_create(dir);
/* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
err = p9_client_symlink(dfid, name, symname, gid, &qid);
if (err < 0) {
p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
goto error;
}
v9fs_invalidate_inode_attr(dir);
error:
p9_fid_put(fid);
p9_fid_put(dfid);
return err;
}
/**
* v9fs_vfs_link_dotl - create a hardlink for dotl
* @old_dentry: dentry for file to link to
* @dir: inode destination for new link
* @dentry: dentry for link
*
*/
static int
v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
struct dentry *dentry)
{
int err;
struct p9_fid *dfid, *oldfid;
struct v9fs_session_info *v9ses;
p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n",
dir->i_ino, old_dentry, dentry);
v9ses = v9fs_inode2v9ses(dir);
dfid = v9fs_parent_fid(dentry);
if (IS_ERR(dfid))
return PTR_ERR(dfid);
oldfid = v9fs_fid_lookup(old_dentry);
if (IS_ERR(oldfid)) {
p9_fid_put(dfid);
return PTR_ERR(oldfid);
}
err = p9_client_link(dfid, oldfid, dentry->d_name.name);
p9_fid_put(dfid);
p9_fid_put(oldfid);
if (err < 0) {
p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
return err;
}
v9fs_invalidate_inode_attr(dir);
if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) {
/* Get the latest stat info from server. */
struct p9_fid *fid;
fid = v9fs_fid_lookup(old_dentry);
if (IS_ERR(fid))
return PTR_ERR(fid);
v9fs_refresh_inode_dotl(fid, d_inode(old_dentry));
p9_fid_put(fid);
}
ihold(d_inode(old_dentry));
d_instantiate(dentry, d_inode(old_dentry));
return err;
}
/**
* v9fs_vfs_mknod_dotl - create a special file
* @idmap: The idmap of the mount
* @dir: inode destination for new link
* @dentry: dentry for file
* @omode: mode for creation
* @rdev: device associated with special file
*
*/
static int
v9fs_vfs_mknod_dotl(struct mnt_idmap *idmap, struct inode *dir,
struct dentry *dentry, umode_t omode, dev_t rdev)
{
int err;
kgid_t gid;
const unsigned char *name;
umode_t mode;
struct v9fs_session_info *v9ses;
struct p9_fid *fid = NULL, *dfid = NULL;
struct inode *inode;
struct p9_qid qid;
struct posix_acl *dacl = NULL, *pacl = NULL;
p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n",
dir->i_ino, dentry, omode,
MAJOR(rdev), MINOR(rdev));
v9ses = v9fs_inode2v9ses(dir);
dfid = v9fs_parent_fid(dentry);
if (IS_ERR(dfid)) {
err = PTR_ERR(dfid);
p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
goto error;
}
gid = v9fs_get_fsgid_for_create(dir);
mode = omode;
/* Update mode based on ACL value */
err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
if (err) {
p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
err);
goto error;
}
name = dentry->d_name.name;
err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
if (err < 0)
goto error;
v9fs_invalidate_inode_attr(dir);
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);
goto error;
}
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);
goto error;
}
v9fs_set_create_acl(inode, fid, dacl, pacl);
v9fs_fid_add(dentry, &fid);
d_instantiate(dentry, inode);
err = 0;
error:
p9_fid_put(fid);
v9fs_put_acl(dacl, pacl);
p9_fid_put(dfid);
return err;
}
/**
* v9fs_vfs_get_link_dotl - follow a symlink path
* @dentry: dentry for symlink
* @inode: inode for symlink
* @done: destructor for return value
*/
static const char *
v9fs_vfs_get_link_dotl(struct dentry *dentry,
struct inode *inode,
struct delayed_call *done)
{
struct p9_fid *fid;
char *target;
int retval;
if (!dentry)
return ERR_PTR(-ECHILD);
p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
fid = v9fs_fid_lookup(dentry);
if (IS_ERR(fid))
return ERR_CAST(fid);
retval = p9_client_readlink(fid, &target);
p9_fid_put(fid);
if (retval)
return ERR_PTR(retval);
set_delayed_call(done, kfree_link, target);
return target;
}
int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
{
struct p9_stat_dotl *st;
struct v9fs_session_info *v9ses;
unsigned int flags;
v9ses = v9fs_inode2v9ses(inode);
st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
if (IS_ERR(st))
return PTR_ERR(st);
/*
* Don't update inode if the file type is different
*/
if (inode_wrong_type(inode, st->st_mode))
goto out;
/*
* We don't want to refresh inode->i_size,
* because we may have cached data
*/
flags = (v9ses->cache & CACHE_LOOSE) ?
V9FS_STAT2INODE_KEEP_ISIZE : 0;
v9fs_stat2inode_dotl(st, inode, flags);
out:
kfree(st);
return 0;
}
const struct inode_operations v9fs_dir_inode_operations_dotl = {
.create = v9fs_vfs_create_dotl,
.atomic_open = v9fs_vfs_atomic_open_dotl,
.lookup = v9fs_vfs_lookup,
.link = v9fs_vfs_link_dotl,
.symlink = v9fs_vfs_symlink_dotl,
.unlink = v9fs_vfs_unlink,
.mkdir = v9fs_vfs_mkdir_dotl,
.rmdir = v9fs_vfs_rmdir,
.mknod = v9fs_vfs_mknod_dotl,
.rename = v9fs_vfs_rename,
.getattr = v9fs_vfs_getattr_dotl,
.setattr = v9fs_vfs_setattr_dotl,
.listxattr = v9fs_listxattr,
.get_inode_acl = v9fs_iop_get_inode_acl,
.get_acl = v9fs_iop_get_acl,
.set_acl = v9fs_iop_set_acl,
};
const struct inode_operations v9fs_file_inode_operations_dotl = {
.getattr = v9fs_vfs_getattr_dotl,
.setattr = v9fs_vfs_setattr_dotl,
.listxattr = v9fs_listxattr,
.get_inode_acl = v9fs_iop_get_inode_acl,
.get_acl = v9fs_iop_get_acl,
.set_acl = v9fs_iop_set_acl,
};
const struct inode_operations v9fs_symlink_inode_operations_dotl = {
.get_link = v9fs_vfs_get_link_dotl,
.getattr = v9fs_vfs_getattr_dotl,
.setattr = v9fs_vfs_setattr_dotl,
.listxattr = v9fs_listxattr,
};
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