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linux-hardened/fs/9p/vfs_inode_dotl.c
M. Mohan Kumar b6f4bee02f fs/9p: Fix atomic_open 
Return EEXISTS if requested file already exists, without this patch open
call will always succeed even if the file exists and user specified
O_CREAT|O_EXCL.

Following test code can be used to verify this patch. Without this patch
executing following test code on 9p mount will result in printing 'test case
failed' always.

main()
{
        int fd;

        /* first create the file */
        fd = open("./file", O_CREAT|O_WRONLY);
        if (fd < 0) {
                perror("open");
                return -1;
        }
        close(fd);

        /* Now opening same file with O_CREAT|O_EXCL should fail */
        fd = open("./file", O_CREAT|O_EXCL);
        if (fd < 0 && errno == EEXIST)
	        printf("test case pass\n");
        else
	        printf("test case failed\n");
        close(fd);
        return 0;
}

Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2013-02-10 16:29:59 -06:00

1038 lines
26 KiB
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/*
* linux/fs/9p/vfs_inode_dotl.c
*
* 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>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to:
* Free Software Foundation
* 51 Franklin Street, Fifth Floor
* Boston, MA 02111-1301 USA
*
*/
#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 int
v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
dev_t rdev);
/**
* v9fs_get_fsgid_for_create - 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 gid_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->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
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;
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;
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_dotl;
else
test = v9fs_test_inode_dotl;
i_ino = v9fs_qid2ino(qid);
inode = iget5_locked(sb, i_ino, 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 = i_ino;
retval = v9fs_init_inode(v9ses, inode,
st->st_mode, new_decode_dev(st->st_rdev));
if (retval)
goto error;
v9fs_stat2inode_dotl(st, inode);
#ifdef CONFIG_9P_FSCACHE
v9fs_cache_inode_get_cookie(inode);
#endif
retval = v9fs_get_acl(inode, fid);
if (retval)
goto error;
unlock_new_inode(inode);
return inode;
error:
unlock_new_inode(inode);
iput(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.
* @dir: directory inode that is being created
* @dentry: dentry that is being deleted
* @mode: create permissions
*
*/
static int
v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
bool excl)
{
return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
}
static int
v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
struct file *file, unsigned flags, umode_t omode,
int *opened)
{
int err = 0;
gid_t gid;
umode_t mode;
char *name = NULL;
struct p9_qid qid;
struct inode *inode;
struct p9_fid *fid = NULL;
struct v9fs_inode *v9inode;
struct p9_fid *dfid, *ofid, *inode_fid;
struct v9fs_session_info *v9ses;
struct posix_acl *pacl = NULL, *dacl = NULL;
struct dentry *res = NULL;
if (d_unhashed(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))
return finish_no_open(file, res);
else if (dentry->d_inode) {
if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
return -EEXIST;
else
return finish_no_open(file, res);
}
v9ses = v9fs_inode2v9ses(dir);
name = (char *) dentry->d_name.name;
p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n",
name, flags, omode);
dfid = v9fs_fid_lookup(dentry->d_parent);
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 = p9_client_walk(dfid, 0, NULL, 1);
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 creat %d\n",
err);
goto error;
}
err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
mode, gid, &qid);
if (err < 0) {
p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n",
err);
goto error;
}
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);
fid = NULL;
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;
}
err = v9fs_fid_add(dentry, fid);
if (err < 0)
goto error;
d_instantiate(dentry, inode);
/* Now set the ACL based on the default value */
v9fs_set_create_acl(dentry, &dacl, &pacl);
v9inode = V9FS_I(inode);
mutex_lock(&v9inode->v_mutex);
if (v9ses->cache && !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 err_clunk_old_fid;
}
v9inode->writeback_fid = (void *) inode_fid;
}
mutex_unlock(&v9inode->v_mutex);
/* Since we are opening a file, assign the open fid to the file */
err = finish_open(file, dentry, generic_file_open, opened);
if (err)
goto err_clunk_old_fid;
file->private_data = ofid;
#ifdef CONFIG_9P_FSCACHE
if (v9ses->cache)
v9fs_cache_inode_set_cookie(inode, file);
#endif
*opened |= FILE_CREATED;
out:
dput(res);
return err;
error:
if (fid)
p9_client_clunk(fid);
err_clunk_old_fid:
if (ofid)
p9_client_clunk(ofid);
v9fs_set_create_acl(NULL, &dacl, &pacl);
goto out;
}
/**
* v9fs_vfs_mkdir_dotl - 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_dotl(struct inode *dir,
struct dentry *dentry, umode_t omode)
{
int err;
struct v9fs_session_info *v9ses;
struct p9_fid *fid = NULL, *dfid = NULL;
gid_t gid;
char *name;
umode_t mode;
struct inode *inode;
struct p9_qid qid;
struct dentry *dir_dentry;
struct posix_acl *dacl = NULL, *pacl = NULL;
p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
err = 0;
v9ses = v9fs_inode2v9ses(dir);
omode |= S_IFDIR;
if (dir->i_mode & S_ISGID)
omode |= S_ISGID;
dir_dentry = dentry->d_parent;
dfid = v9fs_fid_lookup(dir_dentry);
if (IS_ERR(dfid)) {
err = PTR_ERR(dfid);
p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
dfid = NULL;
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 = (char *) dentry->d_name.name;
err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
if (err < 0)
goto error;
/* instantiate inode and assign the unopened fid to the dentry */
if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
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;
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;
}
err = v9fs_fid_add(dentry, fid);
if (err < 0)
goto error;
d_instantiate(dentry, inode);
fid = NULL;
} else {
/*
* Not in cached mode. No need to populate
* inode with stat. We need to get an inode
* so that we can set the acl with dentry
*/
inode = v9fs_get_inode(dir->i_sb, mode, 0);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
goto error;
}
d_instantiate(dentry, inode);
}
/* Now set the ACL based on the default value */
v9fs_set_create_acl(dentry, &dacl, &pacl);
inc_nlink(dir);
v9fs_invalidate_inode_attr(dir);
error:
if (fid)
p9_client_clunk(fid);
v9fs_set_create_acl(NULL, &dacl, &pacl);
return err;
}
static int
v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
struct kstat *stat)
{
int err;
struct v9fs_session_info *v9ses;
struct p9_fid *fid;
struct p9_stat_dotl *st;
p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
err = -EPERM;
v9ses = v9fs_dentry2v9ses(dentry);
if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
generic_fillattr(dentry->d_inode, stat);
return 0;
}
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);
if (IS_ERR(st))
return PTR_ERR(st);
v9fs_stat2inode_dotl(st, dentry->d_inode);
generic_fillattr(dentry->d_inode, 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
* @dentry: file whose metadata to set
* @iattr: metadata assignment structure
*
*/
int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
{
int retval;
struct v9fs_session_info *v9ses;
struct p9_fid *fid;
struct p9_iattr_dotl p9attr;
p9_debug(P9_DEBUG_VFS, "\n");
retval = inode_change_ok(dentry->d_inode, iattr);
if (retval)
return retval;
p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
p9attr.mode = iattr->ia_mode;
p9attr.uid = iattr->ia_uid;
p9attr.gid = iattr->ia_gid;
p9attr.size = iattr->ia_size;
p9attr.atime_sec = iattr->ia_atime.tv_sec;
p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
retval = -EPERM;
v9ses = v9fs_dentry2v9ses(dentry);
fid = v9fs_fid_lookup(dentry);
if (IS_ERR(fid))
return PTR_ERR(fid);
/* Write all dirty data */
if (S_ISREG(dentry->d_inode->i_mode))
filemap_write_and_wait(dentry->d_inode->i_mapping);
retval = p9_client_setattr(fid, &p9attr);
if (retval < 0)
return retval;
if ((iattr->ia_valid & ATTR_SIZE) &&
iattr->ia_size != i_size_read(dentry->d_inode))
truncate_setsize(dentry->d_inode, iattr->ia_size);
v9fs_invalidate_inode_attr(dentry->d_inode);
setattr_copy(dentry->d_inode, iattr);
mark_inode_dirty(dentry->d_inode);
if (iattr->ia_valid & ATTR_MODE) {
/* We also want to update ACL when we update mode bits */
retval = v9fs_acl_chmod(dentry);
if (retval < 0)
return retval;
}
return 0;
}
/**
* v9fs_stat2inode_dotl - populate an inode structure with stat info
* @stat: stat structure
* @inode: inode to populate
* @sb: superblock of filesystem
*
*/
void
v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
{
umode_t mode;
struct v9fs_inode *v9inode = V9FS_I(inode);
if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
inode->i_atime.tv_sec = stat->st_atime_sec;
inode->i_atime.tv_nsec = stat->st_atime_nsec;
inode->i_mtime.tv_sec = stat->st_mtime_sec;
inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
inode->i_ctime.tv_sec = stat->st_ctime_sec;
inode->i_ctime.tv_nsec = 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;
i_size_write(inode, stat->st_size);
inode->i_blocks = stat->st_blocks;
} else {
if (stat->st_result_mask & P9_STATS_ATIME) {
inode->i_atime.tv_sec = stat->st_atime_sec;
inode->i_atime.tv_nsec = stat->st_atime_nsec;
}
if (stat->st_result_mask & P9_STATS_MTIME) {
inode->i_mtime.tv_sec = stat->st_mtime_sec;
inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
}
if (stat->st_result_mask & P9_STATS_CTIME) {
inode->i_ctime.tv_sec = stat->st_ctime_sec;
inode->i_ctime.tv_nsec = 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) {
inode->i_mode = stat->st_mode;
if ((S_ISBLK(inode->i_mode)) ||
(S_ISCHR(inode->i_mode)))
init_special_inode(inode, inode->i_mode,
inode->i_rdev);
}
if (stat->st_result_mask & P9_STATS_RDEV)
inode->i_rdev = new_decode_dev(stat->st_rdev);
if (stat->st_result_mask & P9_STATS_SIZE)
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 inode *dir, struct dentry *dentry,
const char *symname)
{
int err;
gid_t gid;
char *name;
struct p9_qid qid;
struct inode *inode;
struct p9_fid *dfid;
struct p9_fid *fid = NULL;
struct v9fs_session_info *v9ses;
name = (char *) dentry->d_name.name;
p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
v9ses = v9fs_inode2v9ses(dir);
dfid = v9fs_fid_lookup(dentry->d_parent);
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, (char *)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);
if (v9ses->cache) {
/* Now walk from the parent so we can get an 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;
goto error;
}
/* instantiate inode and assign the unopened fid to 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;
}
err = v9fs_fid_add(dentry, fid);
if (err < 0)
goto error;
d_instantiate(dentry, inode);
fid = NULL;
} else {
/* Not in cached mode. No need to populate inode with stat */
inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
goto error;
}
d_instantiate(dentry, inode);
}
error:
if (fid)
p9_client_clunk(fid);
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;
char *name;
struct dentry *dir_dentry;
struct p9_fid *dfid, *oldfid;
struct v9fs_session_info *v9ses;
p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
dir->i_ino, old_dentry->d_name.name, dentry->d_name.name);
v9ses = v9fs_inode2v9ses(dir);
dir_dentry = dentry->d_parent;
dfid = v9fs_fid_lookup(dir_dentry);
if (IS_ERR(dfid))
return PTR_ERR(dfid);
oldfid = v9fs_fid_lookup(old_dentry);
if (IS_ERR(oldfid))
return PTR_ERR(oldfid);
name = (char *) dentry->d_name.name;
err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
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_LOOSE || v9ses->cache == CACHE_FSCACHE) {
/* 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, old_dentry->d_inode);
}
ihold(old_dentry->d_inode);
d_instantiate(dentry, old_dentry->d_inode);
return err;
}
/**
* v9fs_vfs_mknod_dotl - 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_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
dev_t rdev)
{
int err;
gid_t gid;
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 dentry *dir_dentry;
struct posix_acl *dacl = NULL, *pacl = NULL;
p9_debug(P9_DEBUG_VFS, " %lu,%s mode: %hx MAJOR: %u MINOR: %u\n",
dir->i_ino, dentry->d_name.name, omode,
MAJOR(rdev), MINOR(rdev));
if (!new_valid_dev(rdev))
return -EINVAL;
v9ses = v9fs_inode2v9ses(dir);
dir_dentry = dentry->d_parent;
dfid = v9fs_fid_lookup(dir_dentry);
if (IS_ERR(dfid)) {
err = PTR_ERR(dfid);
p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
dfid = NULL;
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 = (char *) 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);
/* instantiate inode and assign the unopened fid to the dentry */
if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
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;
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;
}
err = v9fs_fid_add(dentry, fid);
if (err < 0)
goto error;
d_instantiate(dentry, inode);
fid = NULL;
} else {
/*
* Not in cached mode. No need to populate inode with stat.
* socket syscall returns a fd, so we need instantiate
*/
inode = v9fs_get_inode(dir->i_sb, mode, rdev);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
goto error;
}
d_instantiate(dentry, inode);
}
/* Now set the ACL based on the default value */
v9fs_set_create_acl(dentry, &dacl, &pacl);
error:
if (fid)
p9_client_clunk(fid);
v9fs_set_create_acl(NULL, &dacl, &pacl);
return err;
}
/**
* v9fs_vfs_follow_link_dotl - follow a symlink path
* @dentry: dentry for symlink
* @nd: nameidata
*
*/
static void *
v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
{
int retval;
struct p9_fid *fid;
char *link = __getname();
char *target;
p9_debug(P9_DEBUG_VFS, "%s\n", dentry->d_name.name);
if (!link) {
link = ERR_PTR(-ENOMEM);
goto ndset;
}
fid = v9fs_fid_lookup(dentry);
if (IS_ERR(fid)) {
__putname(link);
link = ERR_CAST(fid);
goto ndset;
}
retval = p9_client_readlink(fid, &target);
if (!retval) {
strcpy(link, target);
kfree(target);
goto ndset;
}
__putname(link);
link = ERR_PTR(retval);
ndset:
nd_set_link(nd, link);
return NULL;
}
int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
{
loff_t i_size;
struct p9_stat_dotl *st;
struct v9fs_session_info *v9ses;
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->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
goto out;
spin_lock(&inode->i_lock);
/*
* We don't want to refresh inode->i_size,
* because we may have cached data
*/
i_size = inode->i_size;
v9fs_stat2inode_dotl(st, inode);
if (v9ses->cache)
inode->i_size = i_size;
spin_unlock(&inode->i_lock);
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,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.removexattr = generic_removexattr,
.listxattr = v9fs_listxattr,
.get_acl = v9fs_iop_get_acl,
};
const struct inode_operations v9fs_file_inode_operations_dotl = {
.getattr = v9fs_vfs_getattr_dotl,
.setattr = v9fs_vfs_setattr_dotl,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.removexattr = generic_removexattr,
.listxattr = v9fs_listxattr,
.get_acl = v9fs_iop_get_acl,
};
const struct inode_operations v9fs_symlink_inode_operations_dotl = {
.readlink = generic_readlink,
.follow_link = v9fs_vfs_follow_link_dotl,
.put_link = v9fs_vfs_put_link,
.getattr = v9fs_vfs_getattr_dotl,
.setattr = v9fs_vfs_setattr_dotl,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.removexattr = generic_removexattr,
.listxattr = v9fs_listxattr,
};
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