static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
unsigned int flags)
{
int err;
struct fuse_entry_out outarg;
struct inode *inode;
struct dentry *newent;
bool outarg_valid = true;
fuse_lock_inode(dir);
err = fuse_lookup_name(dir->i_sb, get_node_id(dir), &entry->d_name,
&outarg, &inode);
fuse_unlock_inode(dir);
if (err == -ENOENT) {
outarg_valid = false;
err = 0;
}
if (err)
goto out_err;
err = -EIO;
if (inode && get_node_id(inode) == FUSE_ROOT_ID)
goto out_iput;
newent = d_splice_alias(inode, entry);
err = PTR_ERR(newent);
if (IS_ERR(newent))
goto out_err;
entry = newent ? newent : entry;
if (outarg_valid)
fuse_change_entry_timeout(entry, &outarg);
else
fuse_invalidate_entry_cache(entry);
fuse_advise_use_readdirplus(dir);
return newent;
out_iput:
iput(inode);
out_err:
return ERR_PTR(err);
}
/***** Get inode using directory and name */
static struct dentry *msdos_lookup(struct inode *dir, struct dentry *dentry,
struct nameidata *nd)
{
struct super_block *sb = dir->i_sb;
struct fat_slot_info sinfo;
struct inode *inode;
int err;
char szBuffer[20];
int len = min((int)dentry->d_name.len, 19);
memset(szBuffer, 0, 20);
__memcpy(szBuffer, dentry->d_name.name, len);
printk (KERN_INFO "myfat: msdos_lookup, dir is %s\n", szBuffer);
lock_super(sb);
err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo);
if (err) {
if (err == -ENOENT) {
inode = NULL;
goto out;
}
goto error;
}
inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); // by rzq: hold the reference count
brelse(sinfo.bh);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
goto error;
}
out:
unlock_super(sb);
dentry->d_op = &msdos_dentry_operations;
dentry = d_splice_alias(inode, dentry);
if (dentry)
dentry->d_op = &msdos_dentry_operations;
return dentry;
error:
unlock_super(sb);
return ERR_PTR(err);
}
/* access routines: lookup, readlink, permission */
static struct dentry *coda_lookup(struct inode *dir, struct dentry *entry, struct nameidata *nd)
{
struct inode *inode = NULL;
struct CodaFid resfid = { { 0, } };
int type = 0;
int error = 0;
const char *name = entry->d_name.name;
size_t length = entry->d_name.len;
if (length > CODA_MAXNAMLEN) {
printk(KERN_ERR "name too long: lookup, %s (%*s)\n",
coda_i2s(dir), (int)length, name);
return ERR_PTR(-ENAMETOOLONG);
}
/* control object, create inode on the fly */
if (coda_isroot(dir) && coda_iscontrol(name, length)) {
error = coda_cnode_makectl(&inode, dir->i_sb);
type = CODA_NOCACHE;
goto exit;
}
lock_kernel();
error = venus_lookup(dir->i_sb, coda_i2f(dir), name, length,
&type, &resfid);
if (!error)
error = coda_cnode_make(&inode, &resfid, dir->i_sb);
unlock_kernel();
if (error && error != -ENOENT)
return ERR_PTR(error);
exit:
entry->d_op = &coda_dentry_operations;
if (inode && (type & CODA_NOCACHE))
coda_flag_inode(inode, C_VATTR | C_PURGE);
return d_splice_alias(inode, entry);
}
static struct dentry *
ospfs_dir_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *ignore)
{
// Find the OSPFS inode corresponding to 'dir'
ospfs_inode_t *dir_oi = ospfs_inode(dir->i_ino);
struct inode *entry_inode = NULL;
int entry_off;
// Make sure filename is not too long
if (dentry->d_name.len > OSPFS_MAXNAMELEN)
return (struct dentry *) ERR_PTR(-ENAMETOOLONG);
// Mark with our operations
dentry->d_op = &ospfs_dentry_ops;
// Search through the directory block
for (entry_off = 0; entry_off < dir_oi->oi_size;
entry_off += OSPFS_DIRENTRY_SIZE) {
// Find the OSPFS inode for the entry
ospfs_direntry_t *od = ospfs_inode_data(dir_oi, entry_off);
// Set 'entry_inode' if we find the file we are looking for
if (od->od_ino > 0
&& strlen(od->od_name) == dentry->d_name.len
&& memcmp(od->od_name, dentry->d_name.name, dentry->d_name.len) == 0) {
entry_inode = ospfs_mk_linux_inode(dir->i_sb, od->od_ino);
if (!entry_inode)
return (struct dentry *) ERR_PTR(-EINVAL);
break;
}
}
// We return a dentry whether or not the file existed.
// The file exists if and only if 'entry_inode != NULL'.
// If the file doesn't exist, the dentry is called a "negative dentry".
// d_splice_alias() attaches the inode to the dentry.
// If it returns a new dentry, we need to set its operations.
if ((dentry = d_splice_alias(entry_inode, dentry)))
dentry->d_op = &ospfs_dentry_ops;
return dentry;
}
static struct dentry *ext2_lookup(struct inode * dir, struct dentry *dentry, struct nameidata *nd)
{
struct inode * inode;
ino_t ino;
if (dentry->d_name.len > EXT2_NAME_LEN)
return ERR_PTR(-ENAMETOOLONG);
ino = ext2_inode_by_name(dir, dentry);
inode = NULL;
if (ino) {
inode = iget(dir->i_sb, ino);
if (!inode)
return ERR_PTR(-EACCES);
}
if (inode)
return d_splice_alias(inode, dentry);
d_add(dentry, inode);
return NULL;
}
static struct dentry *hmfs_lookup(struct inode *dir, struct dentry *dentry,
unsigned int flags)
{
struct inode *inode = NULL;
struct hmfs_dir_entry *de;
if (dentry->d_name.len > HMFS_NAME_LEN)
return ERR_PTR(-ENAMETOOLONG);
inode_read_lock(dir);
de = hmfs_find_entry(dir, &dentry->d_name, NULL, NULL);
inode_read_unlock(dir);
if (de) {
inode = hmfs_iget(dir->i_sb, de->ino);
if (IS_ERR(inode))
return ERR_CAST(inode);
}
return d_splice_alias(inode, dentry);
}
static struct dentry *tux3_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
{
struct buffer_head *buffer;
struct inode *inode;
tux_dirent *entry;
entry = tux_find_dirent(dir, dentry->d_name.name, dentry->d_name.len, &buffer);
if (IS_ERR(entry)) {
if (PTR_ERR(entry) != -ENOENT)
return ERR_PTR(PTR_ERR(entry));
inode = NULL;
goto out;
}
inode = tux3_iget(dir->i_sb, from_be_u64(entry->inum));
brelse(buffer);
if (IS_ERR(inode))
return ERR_PTR(PTR_ERR(inode));
out:
return d_splice_alias(inode, dentry);
}
/* We keep the dirent list sorted in increasing order of name hash,
and we use the same hash function as the dentries. Makes this
nice and simple
*/
static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
struct nameidata *nd)
{
struct jffs2_inode_info *dir_f;
struct jffs2_sb_info *c;
struct jffs2_full_dirent *fd = NULL, *fd_list;
uint32_t ino = 0;
struct inode *inode = NULL;
D1(printk(KERN_DEBUG "jffs2_lookup()\n"));
if (target->d_name.len > JFFS2_MAX_NAME_LEN)
return ERR_PTR(-ENAMETOOLONG);
dir_f = JFFS2_INODE_INFO(dir_i);
c = JFFS2_SB_INFO(dir_i->i_sb);
mutex_lock(&dir_f->sem);
/* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) {
if (fd_list->nhash == target->d_name.hash &&
(!fd || fd_list->version > fd->version) &&
strlen(fd_list->name) == target->d_name.len &&
!strncmp(fd_list->name, target->d_name.name, target->d_name.len)) {
fd = fd_list;
}
}
if (fd)
ino = fd->ino;
mutex_unlock(&dir_f->sem);
if (ino) {
inode = jffs2_iget(dir_i->i_sb, ino);
if (IS_ERR(inode)) {
printk(KERN_WARNING "iget() failed for ino #%u\n", ino);
return ERR_CAST(inode);
}
}
return d_splice_alias(inode, target);
}
/* We keep the dirent list sorted in increasing order of name hash,
and we use the same hash function as the dentries. Makes this
nice and simple
*/
static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
unsigned int flags)
{
struct jffs2_inode_info *dir_f;
struct jffs2_full_dirent *fd = NULL, *fd_list;
uint32_t ino = 0;
struct inode *inode = NULL;
unsigned int nhash;
jffs2_dbg(1, "jffs2_lookup()\n");
if (target->d_name.len > JFFS2_MAX_NAME_LEN)
return ERR_PTR(-ENAMETOOLONG);
dir_f = JFFS2_INODE_INFO(dir_i);
/* The 'nhash' on the fd_list is not the same as the dentry hash */
nhash = full_name_hash(NULL, target->d_name.name, target->d_name.len);
mutex_lock(&dir_f->sem);
/* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= nhash; fd_list = fd_list->next) {
if (fd_list->nhash == nhash &&
(!fd || fd_list->version > fd->version) &&
strlen(fd_list->name) == target->d_name.len &&
!strncmp(fd_list->name, target->d_name.name, target->d_name.len)) {
fd = fd_list;
}
}
if (fd)
ino = fd->ino;
mutex_unlock(&dir_f->sem);
if (ino) {
inode = jffs2_iget(dir_i->i_sb, ino);
if (IS_ERR(inode))
pr_warn("iget() failed for ino #%u\n", ino);
}
return d_splice_alias(inode, target);
}
static struct dentry *ext2_lookup(struct inode * dir, struct dentry *dentry, unsigned int flags)
{
struct inode * inode;
ino_t ino;
if (dentry->d_name.len > EXT2_NAME_LEN)
return ERR_PTR(-ENAMETOOLONG);
ino = ext2_inode_by_name(dir, &dentry->d_name);
inode = NULL;
if (ino) {
inode = ext2_iget(dir->i_sb, ino);
if (inode == ERR_PTR(-ESTALE)) {
ext2_error(dir->i_sb, __func__,
"deleted inode referenced: %lu",
(unsigned long) ino);
return ERR_PTR(-EIO);
}
}
return d_splice_alias(inode, dentry);
}
static struct dentry *reiserfs_lookup(struct inode *dir, struct dentry *dentry,
unsigned int flags)
{
int retval;
struct inode *inode = NULL;
struct reiserfs_dir_entry de;
INITIALIZE_PATH(path_to_entry);
if (REISERFS_MAX_NAME(dir->i_sb->s_blocksize) < dentry->d_name.len)
return ERR_PTR(-ENAMETOOLONG);
reiserfs_write_lock(dir->i_sb);
de.de_gen_number_bit_string = NULL;
retval =
reiserfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len,
&path_to_entry, &de);
pathrelse(&path_to_entry);
if (retval == NAME_FOUND) {
inode = reiserfs_iget(dir->i_sb,
(struct cpu_key *)&de.de_dir_id);
if (!inode || IS_ERR(inode)) {
reiserfs_write_unlock(dir->i_sb);
return ERR_PTR(-EACCES);
}
/*
* Propagate the private flag so we know we're
* in the priv tree
*/
if (IS_PRIVATE(dir))
inode->i_flags |= S_PRIVATE;
}
reiserfs_write_unlock(dir->i_sb);
if (retval == IO_ERROR) {
return ERR_PTR(-EIO);
}
return d_splice_alias(inode, dentry);
}
STATIC struct dentry *
xfs_vn_lookup(
struct inode *dir,
struct dentry *dentry,
struct nameidata *nd)
{
bhv_vnode_t *cvp;
int error;
if (dentry->d_name.len >= MAXNAMELEN)
return ERR_PTR(-ENAMETOOLONG);
error = xfs_lookup(XFS_I(dir), dentry, &cvp);
if (unlikely(error)) {
if (unlikely(error != ENOENT))
return ERR_PTR(-error);
d_add(dentry, NULL);
return NULL;
}
return d_splice_alias(vn_to_inode(cvp), dentry);
}
static struct dentry *tux3_lookup(struct inode *dir, struct dentry *dentry,
unsigned int flags)
{
struct buffer_head *buffer;
struct inode *inode;
tux_dirent *entry;
inum_t inum;
entry = tux_find_dirent(dir, &dentry->d_name, &buffer);
if (IS_ERR(entry)) {
if (PTR_ERR(entry) != -ENOENT)
return ERR_CAST(entry);
inode = NULL;
goto out;
}
inum = be64_to_cpu(entry->inum);
blockput(buffer);
inode = tux3_iget(tux_sb(dir->i_sb), inum);
out:
return d_splice_alias(inode, dentry);
}
STATIC struct dentry *
linvfs_lookup(
struct inode *dir,
struct dentry *dentry,
struct nameidata *nd)
{
struct vnode *vp = LINVFS_GET_VP(dir), *cvp;
int error;
if (dentry->d_name.len >= MAXNAMELEN)
return ERR_PTR(-ENAMETOOLONG);
VOP_LOOKUP(vp, dentry, &cvp, 0, NULL, NULL, error);
if (error) {
if (unlikely(error != ENOENT))
return ERR_PTR(-error);
d_add(dentry, NULL);
return NULL;
}
return d_splice_alias(LINVFS_GET_IP(cvp), dentry);
}
STATIC struct dentry *
xfs_vn_ci_lookup(
struct inode *dir,
struct dentry *dentry,
struct nameidata *nd)
{
struct xfs_inode *ip;
struct xfs_name xname;
struct xfs_name ci_name;
struct qstr dname;
int error;
if (dentry->d_name.len >= MAXNAMELEN)
return ERR_PTR(-ENAMETOOLONG);
xfs_dentry_to_name(&xname, dentry);
error = xfs_lookup(XFS_I(dir), &xname, &ip, &ci_name);
if (unlikely(error)) {
if (unlikely(error != ENOENT))
return ERR_PTR(-error);
/*
* call d_add(dentry, NULL) here when d_drop_negative_children
* is called in xfs_vn_mknod (ie. allow negative dentries
* with CI filesystems).
*/
return NULL;
}
/* if exact match, just splice and exit */
if (!ci_name.name)
return d_splice_alias(VFS_I(ip), dentry);
/* else case-insensitive match... */
dname.name = ci_name.name;
dname.len = ci_name.len;
dentry = d_add_ci(dentry, VFS_I(ip), &dname);
kmem_free(ci_name.name);
return dentry;
}
static struct dentry *kernfs_iop_lookup(struct inode *dir,
struct dentry *dentry,
unsigned int flags)
{
struct dentry *ret;
struct kernfs_node *parent = dentry->d_parent->d_fsdata;
struct kernfs_node *kn;
struct inode *inode;
const void *ns = NULL;
mutex_lock(&kernfs_mutex);
if (kernfs_ns_enabled(parent))
ns = kernfs_info(dir->i_sb)->ns;
kn = kernfs_find_ns(parent, dentry->d_name.name, ns);
/* no such entry */
if (!kn || !kernfs_active(kn)) {
ret = NULL;
goto out_unlock;
}
kernfs_get(kn);
dentry->d_fsdata = kn;
/* attach dentry and inode */
inode = kernfs_get_inode(dir->i_sb, kn);
if (!inode) {
ret = ERR_PTR(-ENOMEM);
goto out_unlock;
}
/* instantiate and hash dentry */
ret = d_splice_alias(inode, dentry);
out_unlock:
mutex_unlock(&kernfs_mutex);
return ret;
}
static struct dentry *jfs_lookup(struct inode *dip, struct dentry *dentry, struct nameidata *nd)
{
struct btstack btstack;
ino_t inum;
struct inode *ip;
struct component_name key;
const char *name = dentry->d_name.name;
int len = dentry->d_name.len;
int rc;
jfs_info("jfs_lookup: name = %s", name);
if ((name[0] == '.') && (len == 1))
inum = dip->i_ino;
else if (strcmp(name, "..") == 0)
inum = PARENT(dip);
else {
if ((rc = get_UCSname(&key, dentry)))
return ERR_PTR(rc);
rc = dtSearch(dip, &key, &inum, &btstack, JFS_LOOKUP);
free_UCSname(&key);
if (rc == -ENOENT) {
d_add(dentry, NULL);
return NULL;
} else if (rc) {
jfs_err("jfs_lookup: dtSearch returned %d", rc);
return ERR_PTR(rc);
}
}
ip = jfs_iget(dip->i_sb, inum);
if (IS_ERR(ip)) {
jfs_err("jfs_lookup: iget failed on inum %d", (uint) inum);
return ERR_CAST(ip);
}
return d_splice_alias(ip, dentry);
}
static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
struct file *file, int *opened)
{
struct inode *inode;
struct dentry *d;
struct gfs2_holder gh;
struct gfs2_glock *gl;
int error;
inode = gfs2_lookupi(dir, &dentry->d_name, 0);
if (!inode)
return NULL;
if (IS_ERR(inode))
return ERR_CAST(inode);
gl = GFS2_I(inode)->i_gl;
error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
if (error) {
iput(inode);
return ERR_PTR(error);
}
d = d_splice_alias(inode, dentry);
if (IS_ERR(d)) {
iput(inode);
gfs2_glock_dq_uninit(&gh);
return d;
}
if (file && S_ISREG(inode->i_mode))
error = finish_open(file, dentry, gfs2_open_common, opened);
gfs2_glock_dq_uninit(&gh);
if (error) {
dput(d);
return ERR_PTR(error);
}
return d;
}
static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
unsigned int flags)
{
struct inode *inode = NULL;
struct f2fs_dir_entry *de;
struct page *page;
if (dentry->d_name.len > F2FS_NAME_LEN)
return ERR_PTR(-ENAMETOOLONG);
de = f2fs_find_entry(dir, &dentry->d_name, &page);
if (de) {
nid_t ino = le32_to_cpu(de->ino);
f2fs_dentry_kunmap(dir, page);
f2fs_put_page(page, 0);
inode = f2fs_iget(dir->i_sb, ino);
if (IS_ERR(inode))
return ERR_CAST(inode);
}
return d_splice_alias(inode, dentry);
}
/***** Get inode using directory and name */
static struct dentry *msdos_lookup(struct inode *dir, struct dentry *dentry,
struct nameidata *nd)
{
struct super_block *sb = dir->i_sb;
struct fat_slot_info sinfo;
struct inode *inode;
int err;
lock_super(sb);
err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo);
if (err) {
if (err == -ENOENT) {
inode = NULL;
goto out;
}
goto error;
}
inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
brelse(sinfo.bh);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
goto error;
}
out:
unlock_super(sb);
dentry->d_op = &msdos_dentry_operations;
dentry = d_splice_alias(inode, dentry);
if (dentry)
dentry->d_op = &msdos_dentry_operations;
return dentry;
error:
unlock_super(sb);
return ERR_PTR(err);
}
/***** Get inode using directory and name */
static struct dentry *vxext_lookup(struct inode *dir, struct dentry *dentry,
unsigned int flags)
{
struct super_block *sb = dir->i_sb;
struct fat_slot_info sinfo;
struct inode *inode;
int err;
mutex_lock(&MSDOS_SB(sb)->s_lock);
err = vxext_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo);
switch (err) {
case -ENOENT:
inode = NULL;
break;
case 0:
inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
brelse(sinfo.bh);
break;
default:
inode = ERR_PTR(err);
}
mutex_unlock(&MSDOS_SB(sb)->s_lock);
return d_splice_alias(inode, dentry);
}
STATIC struct dentry *
xfs_vn_lookup(
struct inode *dir,
struct dentry *dentry,
struct nameidata *nd)
{
struct xfs_inode *cip;
struct xfs_name name;
int error;
if (dentry->d_name.len >= MAXNAMELEN)
return ERR_PTR(-ENAMETOOLONG);
xfs_dentry_to_name(&name, dentry);
error = xfs_lookup(XFS_I(dir), &name, &cip, NULL);
if (unlikely(error)) {
if (unlikely(error != ENOENT))
return ERR_PTR(-error);
d_add(dentry, NULL);
return NULL;
}
return d_splice_alias(VFS_I(cip), dentry);
}
static struct dentry *msdos_lookup(struct inode *dir, struct dentry *dentry,
struct nameidata *nd)
{
struct super_block *sb = dir->i_sb;
struct fat_slot_info sinfo;
struct inode *inode;
int err;
lock_super(sb);
err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo);
switch (err) {
case -ENOENT:
inode = NULL;
break;
case 0:
inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
brelse(sinfo.bh);
break;
default:
inode = ERR_PTR(err);
}
unlock_super(sb);
return d_splice_alias(inode, dentry);
}
/*
* hfs_lookup()
*/
static struct dentry *hfs_lookup(struct inode *dir, struct dentry *dentry,
unsigned int flags)
{
hfs_cat_rec rec;
struct hfs_find_data fd;
struct inode *inode = NULL;
int res;
res = hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd);
if (res)
return ERR_PTR(res);
hfs_cat_build_key(dir->i_sb, fd.search_key, dir->i_ino, &dentry->d_name);
res = hfs_brec_read(&fd, &rec, sizeof(rec));
if (res) {
if (res != -ENOENT)
inode = ERR_PTR(res);
} else {
inode = hfs_iget(dir->i_sb, &fd.search_key->cat, &rec);
if (!inode)
inode = ERR_PTR(-EACCES);
}
hfs_find_exit(&fd);
return d_splice_alias(inode, dentry);
}
static struct dentry *ntfs_lookup(struct inode *dir_ino, struct dentry *dent,
struct nameidata *nd)
{
ntfs_volume *vol = NTFS_SB(dir_ino->i_sb);
struct inode *dent_inode;
ntfschar *uname;
ntfs_name *name = NULL;
MFT_REF mref;
unsigned long dent_ino;
int uname_len;
ntfs_debug("Looking up %s in directory inode 0x%lx.",
dent->d_name.name, dir_ino->i_ino);
uname_len = ntfs_nlstoucs(vol, dent->d_name.name, dent->d_name.len,
&uname);
if (uname_len < 0) {
if (uname_len != -ENAMETOOLONG)
ntfs_error(vol->sb, "Failed to convert name to "
"Unicode.");
return ERR_PTR(uname_len);
}
mref = ntfs_lookup_inode_by_name(NTFS_I(dir_ino), uname, uname_len,
&name);
kmem_cache_free(ntfs_name_cache, uname);
if (!IS_ERR_MREF(mref)) {
dent_ino = MREF(mref);
ntfs_debug("Found inode 0x%lx. Calling ntfs_iget.", dent_ino);
dent_inode = ntfs_iget(vol->sb, dent_ino);
if (likely(!IS_ERR(dent_inode))) {
if (is_bad_inode(dent_inode) || MSEQNO(mref) ==
NTFS_I(dent_inode)->seq_no ||
dent_ino == FILE_MFT) {
if (!name) {
ntfs_debug("Done. (Case 1.)");
return d_splice_alias(dent_inode, dent);
}
goto handle_name;
}
ntfs_error(vol->sb, "Found stale reference to inode "
"0x%lx (reference sequence number = "
"0x%x, inode sequence number = 0x%x), "
"returning -EIO. Run chkdsk.",
dent_ino, MSEQNO(mref),
NTFS_I(dent_inode)->seq_no);
iput(dent_inode);
dent_inode = ERR_PTR(-EIO);
} else
ntfs_error(vol->sb, "ntfs_iget(0x%lx) failed with "
"error code %li.", dent_ino,
PTR_ERR(dent_inode));
kfree(name);
return (struct dentry *)dent_inode;
}
if (MREF_ERR(mref) == -ENOENT) {
ntfs_debug("Entry was not found, adding negative dentry.");
d_add(dent, NULL);
ntfs_debug("Done.");
return NULL;
}
ntfs_error(vol->sb, "ntfs_lookup_ino_by_name() failed with error "
"code %i.", -MREF_ERR(mref));
return ERR_PTR(MREF_ERR(mref));
handle_name:
{
MFT_RECORD *m;
ntfs_attr_search_ctx *ctx;
ntfs_inode *ni = NTFS_I(dent_inode);
int err;
struct qstr nls_name;
nls_name.name = NULL;
if (name->type != FILE_NAME_DOS) {
ntfs_debug("Case 2.");
nls_name.len = (unsigned)ntfs_ucstonls(vol,
(ntfschar*)&name->name, name->len,
(unsigned char**)&nls_name.name, 0);
kfree(name);
} else {
FILE_NAME_ATTR *fn;
ntfs_debug("Case 3.");
kfree(name);
ni = NTFS_I(dent_inode);
m = map_mft_record(ni);
if (IS_ERR(m)) {
err = PTR_ERR(m);
m = NULL;
ctx = NULL;
goto err_out;
}
ctx = ntfs_attr_get_search_ctx(ni, m);
if (unlikely(!ctx)) {
err = -ENOMEM;
goto err_out;
}
do {
ATTR_RECORD *a;
u32 val_len;
err = ntfs_attr_lookup(AT_FILE_NAME, NULL, 0, 0, 0,
NULL, 0, ctx);
if (unlikely(err)) {
ntfs_error(vol->sb, "Inode corrupt: No WIN32 "
"namespace counterpart to DOS "
"file name. Run chkdsk.");
if (err == -ENOENT)
err = -EIO;
goto err_out;
}
a = ctx->attr;
if (a->non_resident || a->flags)
goto eio_err_out;
val_len = le32_to_cpu(a->data.resident.value_length);
if (le16_to_cpu(a->data.resident.value_offset) +
val_len > le32_to_cpu(a->length))
goto eio_err_out;
fn = (FILE_NAME_ATTR*)((u8*)ctx->attr + le16_to_cpu(
ctx->attr->data.resident.value_offset));
if ((u32)(fn->file_name_length * sizeof(ntfschar) +
sizeof(FILE_NAME_ATTR)) > val_len)
goto eio_err_out;
} while (fn->file_name_type != FILE_NAME_WIN32);
nls_name.len = (unsigned)ntfs_ucstonls(vol,
(ntfschar*)&fn->file_name, fn->file_name_length,
(unsigned char**)&nls_name.name, 0);
ntfs_attr_put_search_ctx(ctx);
unmap_mft_record(ni);
}
m = NULL;
ctx = NULL;
if ((signed)nls_name.len < 0) {
err = (signed)nls_name.len;
goto err_out;
}
nls_name.hash = full_name_hash(nls_name.name, nls_name.len);
dent = d_add_ci(dent, dent_inode, &nls_name);
kfree(nls_name.name);
return dent;
eio_err_out:
ntfs_error(vol->sb, "Illegal file name attribute. Run chkdsk.");
err = -EIO;
err_out:
if (ctx)
ntfs_attr_put_search_ctx(ctx);
if (m)
unmap_mft_record(ni);
iput(dent_inode);
ntfs_error(vol->sb, "Failed, returning error code %i.", err);
return ERR_PTR(err);
}
}
static struct dentry *squashfs_lookup(struct inode *dir, struct dentry *dentry,
unsigned int flags)
{
const unsigned char *name = dentry->d_name.name;
int len = dentry->d_name.len;
struct inode *inode = NULL;
struct squashfs_sb_info *msblk = dir->i_sb->s_fs_info;
struct squashfs_dir_header dirh;
struct squashfs_dir_entry *dire;
u64 block = squashfs_i(dir)->start + msblk->directory_table;
int offset = squashfs_i(dir)->offset;
int err, length;
unsigned int dir_count, size;
TRACE("Entered squashfs_lookup [%llx:%x]\n", block, offset);
dire = kmalloc(sizeof(*dire) + SQUASHFS_NAME_LEN + 1, GFP_KERNEL);
if (dire == NULL) {
ERROR("Failed to allocate squashfs_dir_entry\n");
return ERR_PTR(-ENOMEM);
}
if (len > SQUASHFS_NAME_LEN) {
err = -ENAMETOOLONG;
goto failed;
}
length = get_dir_index_using_name(dir->i_sb, &block, &offset,
squashfs_i(dir)->dir_idx_start,
squashfs_i(dir)->dir_idx_offset,
squashfs_i(dir)->dir_idx_cnt, name, len);
while (length < i_size_read(dir)) {
/*
* Read directory header.
*/
err = squashfs_read_metadata(dir->i_sb, &dirh, &block,
&offset, sizeof(dirh));
if (err < 0)
goto read_failure;
length += sizeof(dirh);
dir_count = le32_to_cpu(dirh.count) + 1;
if (dir_count > SQUASHFS_DIR_COUNT)
goto data_error;
while (dir_count--) {
/*
* Read directory entry.
*/
err = squashfs_read_metadata(dir->i_sb, dire, &block,
&offset, sizeof(*dire));
if (err < 0)
goto read_failure;
size = le16_to_cpu(dire->size) + 1;
/* size should never be larger than SQUASHFS_NAME_LEN */
if (size > SQUASHFS_NAME_LEN)
goto data_error;
err = squashfs_read_metadata(dir->i_sb, dire->name,
&block, &offset, size);
if (err < 0)
goto read_failure;
length += sizeof(*dire) + size;
if (name[0] < dire->name[0])
goto exit_lookup;
if (len == size && !strncmp(name, dire->name, len)) {
unsigned int blk, off, ino_num;
long long ino;
blk = le32_to_cpu(dirh.start_block);
off = le16_to_cpu(dire->offset);
ino_num = le32_to_cpu(dirh.inode_number) +
(short) le16_to_cpu(dire->inode_number);
ino = SQUASHFS_MKINODE(blk, off);
TRACE("calling squashfs_iget for directory "
"entry %s, inode %x:%x, %d\n", name,
blk, off, ino_num);
inode = squashfs_iget(dir->i_sb, ino, ino_num);
goto exit_lookup;
}
}
}
exit_lookup:
kfree(dire);
return d_splice_alias(inode, dentry);
data_error:
err = -EIO;
read_failure:
ERROR("Unable to read directory block [%llx:%x]\n",
squashfs_i(dir)->start + msblk->directory_table,
squashfs_i(dir)->offset);
failed:
kfree(dire);
return ERR_PTR(err);
}
/*
* Attempt to resolve an object name (dentry->d_name), parent handle, and
* fsid into a handle for the object.
*/
static struct dentry *orangefs_lookup(struct inode *dir, struct dentry *dentry,
unsigned int flags)
{
struct orangefs_inode_s *parent = ORANGEFS_I(dir);
struct orangefs_kernel_op_s *new_op;
struct inode *inode;
struct dentry *res;
int ret = -EINVAL;
/*
* in theory we could skip a lookup here (if the intent is to
* create) in order to avoid a potentially failed lookup, but
* leaving it in can skip a valid lookup and try to create a file
* that already exists (e.g. the vfs already handles checking for
* -EEXIST on O_EXCL opens, which is broken if we skip this lookup
* in the create path)
*/
gossip_debug(GOSSIP_NAME_DEBUG, "%s called on %s\n",
__func__, dentry->d_name.name);
if (dentry->d_name.len > (ORANGEFS_NAME_MAX - 1))
return ERR_PTR(-ENAMETOOLONG);
new_op = op_alloc(ORANGEFS_VFS_OP_LOOKUP);
if (!new_op)
return ERR_PTR(-ENOMEM);
new_op->upcall.req.lookup.sym_follow = ORANGEFS_LOOKUP_LINK_NO_FOLLOW;
gossip_debug(GOSSIP_NAME_DEBUG, "%s:%s:%d using parent %pU\n",
__FILE__,
__func__,
__LINE__,
&parent->refn.khandle);
new_op->upcall.req.lookup.parent_refn = parent->refn;
strncpy(new_op->upcall.req.lookup.d_name, dentry->d_name.name,
ORANGEFS_NAME_MAX);
gossip_debug(GOSSIP_NAME_DEBUG,
"%s: doing lookup on %s under %pU,%d\n",
__func__,
new_op->upcall.req.lookup.d_name,
&new_op->upcall.req.lookup.parent_refn.khandle,
new_op->upcall.req.lookup.parent_refn.fs_id);
ret = service_operation(new_op, __func__, get_interruptible_flag(dir));
gossip_debug(GOSSIP_NAME_DEBUG,
"Lookup Got %pU, fsid %d (ret=%d)\n",
&new_op->downcall.resp.lookup.refn.khandle,
new_op->downcall.resp.lookup.refn.fs_id,
ret);
if (ret < 0) {
if (ret == -ENOENT) {
/*
* if no inode was found, add a negative dentry to
* dcache anyway; if we don't, we don't hold expected
* lookup semantics and we most noticeably break
* during directory renames.
*
* however, if the operation failed or exited, do not
* add the dentry (e.g. in the case that a touch is
* issued on a file that already exists that was
* interrupted during this lookup -- no need to add
* another negative dentry for an existing file)
*/
gossip_debug(GOSSIP_NAME_DEBUG,
"orangefs_lookup: Adding *negative* dentry "
"%p for %s\n",
dentry,
dentry->d_name.name);
d_add(dentry, NULL);
res = NULL;
goto out;
}
/* must be a non-recoverable error */
res = ERR_PTR(ret);
goto out;
}
dentry->d_time = jiffies + dcache_timeout_msecs*HZ/1000;
inode = orangefs_iget(dir->i_sb, &new_op->downcall.resp.lookup.refn);
if (IS_ERR(inode)) {
gossip_debug(GOSSIP_NAME_DEBUG,
"error %ld from iget\n", PTR_ERR(inode));
res = ERR_CAST(inode);
goto out;
}
ORANGEFS_I(inode)->getattr_time = jiffies - 1;
gossip_debug(GOSSIP_NAME_DEBUG,
"%s:%s:%d "
"Found good inode [%lu] with count [%d]\n",
__FILE__,
__func__,
__LINE__,
inode->i_ino,
(int)atomic_read(&inode->i_count));
/* update dentry/inode pair into dcache */
res = d_splice_alias(inode, dentry);
gossip_debug(GOSSIP_NAME_DEBUG,
"Lookup success (inode ct = %d)\n",
(int)atomic_read(&inode->i_count));
out:
op_release(new_op);
return res;
}
static int fuse_direntplus_link(struct file *file,
struct fuse_direntplus *direntplus,
u64 attr_version)
{
struct fuse_entry_out *o = &direntplus->entry_out;
struct fuse_dirent *dirent = &direntplus->dirent;
struct dentry *parent = file->f_path.dentry;
struct qstr name = QSTR_INIT(dirent->name, dirent->namelen);
struct dentry *dentry;
struct dentry *alias;
struct inode *dir = d_inode(parent);
struct fuse_conn *fc;
struct inode *inode;
DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
if (!o->nodeid) {
/*
* Unlike in the case of fuse_lookup, zero nodeid does not mean
* ENOENT. Instead, it only means the userspace filesystem did
* not want to return attributes/handle for this entry.
*
* So do nothing.
*/
return 0;
}
if (name.name[0] == '.') {
/*
* We could potentially refresh the attributes of the directory
* and its parent?
*/
if (name.len == 1)
return 0;
if (name.name[1] == '.' && name.len == 2)
return 0;
}
if (invalid_nodeid(o->nodeid))
return -EIO;
if (!fuse_valid_type(o->attr.mode))
return -EIO;
fc = get_fuse_conn(dir);
name.hash = full_name_hash(parent, name.name, name.len);
dentry = d_lookup(parent, &name);
if (!dentry) {
retry:
dentry = d_alloc_parallel(parent, &name, &wq);
if (IS_ERR(dentry))
return PTR_ERR(dentry);
}
if (!d_in_lookup(dentry)) {
struct fuse_inode *fi;
inode = d_inode(dentry);
if (!inode ||
get_node_id(inode) != o->nodeid ||
((o->attr.mode ^ inode->i_mode) & S_IFMT)) {
d_invalidate(dentry);
dput(dentry);
goto retry;
}
if (is_bad_inode(inode)) {
dput(dentry);
return -EIO;
}
fi = get_fuse_inode(inode);
spin_lock(&fc->lock);
fi->nlookup++;
spin_unlock(&fc->lock);
forget_all_cached_acls(inode);
fuse_change_attributes(inode, &o->attr,
entry_attr_timeout(o),
attr_version);
/*
* The other branch comes via fuse_iget()
* which bumps nlookup inside
*/
} else {
inode = fuse_iget(dir->i_sb, o->nodeid, o->generation,
&o->attr, entry_attr_timeout(o),
attr_version);
if (!inode)
inode = ERR_PTR(-ENOMEM);
alias = d_splice_alias(inode, dentry);
d_lookup_done(dentry);
if (alias) {
dput(dentry);
dentry = alias;
}
if (IS_ERR(dentry))
return PTR_ERR(dentry);
}
if (fc->readdirplus_auto)
set_bit(FUSE_I_INIT_RDPLUS, &get_fuse_inode(inode)->state);
fuse_change_entry_timeout(dentry, o);
dput(dentry);
return 0;
}
static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
struct gfs2_inode *ip, struct gfs2_diradd *da)
{
struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
int error;
if (da->nr_blocks) {
error = gfs2_quota_lock_check(dip);
if (error)
goto fail_quota_locks;
error = gfs2_inplace_reserve(dip, &ap);
if (error)
goto fail_quota_locks;
error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
if (error)
goto fail_ipreserv;
} else {
error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
if (error)
goto fail_quota_locks;
}
error = gfs2_dir_add(&dip->i_inode, name, ip, da);
if (error)
goto fail_end_trans;
fail_end_trans:
gfs2_trans_end(sdp);
fail_ipreserv:
gfs2_inplace_release(dip);
fail_quota_locks:
gfs2_quota_unlock(dip);
return error;
}
static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
void *fs_info)
{
const struct xattr *xattr;
int err = 0;
for (xattr = xattr_array; xattr->name != NULL; xattr++) {
err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
xattr->value_len, 0,
GFS2_EATYPE_SECURITY);
if (err < 0)
break;
}
return err;
}
static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip,
const struct qstr *qstr)
{
return security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr,
&gfs2_initxattrs, NULL);
}
/**
* gfs2_create_inode - Create a new inode
* @dir: The parent directory
* @dentry: The new dentry
* @file: If non-NULL, the file which is being opened
* @mode: The permissions on the new inode
* @dev: For device nodes, this is the device number
* @symname: For symlinks, this is the link destination
* @size: The initial size of the inode (ignored for directories)
*
* Returns: 0 on success, or error code
*/
static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
struct file *file,
umode_t mode, dev_t dev, const char *symname,
unsigned int size, int excl, int *opened)
{
const struct qstr *name = &dentry->d_name;
struct posix_acl *default_acl, *acl;
struct gfs2_holder ghs[2];
struct inode *inode = NULL;
struct gfs2_inode *dip = GFS2_I(dir), *ip;
struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
struct gfs2_glock *io_gl;
struct dentry *d;
int error;
u32 aflags = 0;
struct gfs2_diradd da = { .bh = NULL, };
if (!name->len || name->len > GFS2_FNAMESIZE)
return -ENAMETOOLONG;
error = gfs2_rs_alloc(dip);
if (error)
return error;
error = gfs2_rindex_update(sdp);
if (error)
return error;
error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
if (error)
goto fail;
error = create_ok(dip, name, mode);
if (error)
goto fail_gunlock;
inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
error = PTR_ERR(inode);
if (!IS_ERR(inode)) {
d = d_splice_alias(inode, dentry);
error = PTR_ERR(d);
if (IS_ERR(d)) {
inode = ERR_CAST(d);
goto fail_gunlock;
}
error = 0;
if (file) {
if (S_ISREG(inode->i_mode)) {
WARN_ON(d != NULL);
error = finish_open(file, dentry, gfs2_open_common, opened);
} else {
error = finish_no_open(file, d);
}
} else {
dput(d);
}
gfs2_glock_dq_uninit(ghs);
return error;
} else if (error != -ENOENT) {
goto fail_gunlock;
}
error = gfs2_diradd_alloc_required(dir, name, &da);
if (error < 0)
goto fail_gunlock;
inode = new_inode(sdp->sd_vfs);
error = -ENOMEM;
if (!inode)
goto fail_gunlock;
error = posix_acl_create(dir, &mode, &default_acl, &acl);
if (error)
goto fail_free_vfs_inode;
ip = GFS2_I(inode);
error = gfs2_rs_alloc(ip);
if (error)
goto fail_free_acls;
inode->i_mode = mode;
set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
inode->i_rdev = dev;
inode->i_size = size;
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
gfs2_set_inode_blocks(inode, 1);
munge_mode_uid_gid(dip, inode);
ip->i_goal = dip->i_goal;
ip->i_diskflags = 0;
ip->i_eattr = 0;
ip->i_height = 0;
ip->i_depth = 0;
ip->i_entries = 0;
switch(mode & S_IFMT) {
case S_IFREG:
if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
gfs2_tune_get(sdp, gt_new_files_jdata))
ip->i_diskflags |= GFS2_DIF_JDATA;
gfs2_set_aops(inode);
break;
case S_IFDIR:
ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
ip->i_diskflags |= GFS2_DIF_JDATA;
ip->i_entries = 2;
break;
}
gfs2_set_inode_flags(inode);
if ((GFS2_I(sdp->sd_root_dir->d_inode) == dip) ||
(dip->i_diskflags & GFS2_DIF_TOPDIR))
aflags |= GFS2_AF_ORLOV;
error = alloc_dinode(ip, aflags);
if (error)
goto fail_free_inode;
error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
if (error)
goto fail_free_inode;
ip->i_gl->gl_object = ip;
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
if (error)
goto fail_free_inode;
error = gfs2_trans_begin(sdp, RES_DINODE, 0);
if (error)
goto fail_gunlock2;
init_dinode(dip, ip, symname);
gfs2_trans_end(sdp);
error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
if (error)
goto fail_gunlock2;
error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
if (error)
goto fail_gunlock2;
ip->i_iopen_gh.gh_gl->gl_object = ip;
gfs2_glock_put(io_gl);
gfs2_set_iop(inode);
insert_inode_hash(inode);
if (default_acl) {
error = gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
posix_acl_release(default_acl);
}
if (acl) {
if (!error)
error = gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
posix_acl_release(acl);
}
if (error)
goto fail_gunlock3;
error = gfs2_security_init(dip, ip, name);
if (error)
goto fail_gunlock3;
error = link_dinode(dip, name, ip, &da);
if (error)
goto fail_gunlock3;
mark_inode_dirty(inode);
d_instantiate(dentry, inode);
if (file) {
*opened |= FILE_CREATED;
error = finish_open(file, dentry, gfs2_open_common, opened);
}
gfs2_glock_dq_uninit(ghs);
gfs2_glock_dq_uninit(ghs + 1);
return error;
fail_gunlock3:
gfs2_glock_dq_uninit(ghs + 1);
if (ip->i_gl)
gfs2_glock_put(ip->i_gl);
goto fail_gunlock;
fail_gunlock2:
gfs2_glock_dq_uninit(ghs + 1);
fail_free_inode:
if (ip->i_gl)
gfs2_glock_put(ip->i_gl);
gfs2_rs_delete(ip, NULL);
fail_free_acls:
if (default_acl)
posix_acl_release(default_acl);
if (acl)
posix_acl_release(acl);
fail_free_vfs_inode:
free_inode_nonrcu(inode);
inode = NULL;
fail_gunlock:
gfs2_dir_no_add(&da);
gfs2_glock_dq_uninit(ghs);
if (inode && !IS_ERR(inode)) {
clear_nlink(inode);
mark_inode_dirty(inode);
set_bit(GIF_ALLOC_FAILED, &GFS2_I(inode)->i_flags);
iput(inode);
}
fail:
return error;
}
/**
* gfs2_create - Create a file
* @dir: The directory in which to create the file
* @dentry: The dentry of the new file
* @mode: The mode of the new file
*
* Returns: errno
*/
static int gfs2_create(struct inode *dir, struct dentry *dentry,
umode_t mode, bool excl)
{
return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL);
}
/**
* __gfs2_lookup - Look up a filename in a directory and return its inode
* @dir: The directory inode
* @dentry: The dentry of the new inode
* @file: File to be opened
* @opened: atomic_open flags
*
*
* Returns: errno
*/
static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
struct file *file, int *opened)
{
struct inode *inode;
struct dentry *d;
struct gfs2_holder gh;
struct gfs2_glock *gl;
int error;
inode = gfs2_lookupi(dir, &dentry->d_name, 0);
if (!inode)
return NULL;
if (IS_ERR(inode))
return ERR_CAST(inode);
gl = GFS2_I(inode)->i_gl;
error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
if (error) {
iput(inode);
return ERR_PTR(error);
}
d = d_splice_alias(inode, dentry);
if (IS_ERR(d)) {
gfs2_glock_dq_uninit(&gh);
return d;
}
if (file && S_ISREG(inode->i_mode))
error = finish_open(file, dentry, gfs2_open_common, opened);
gfs2_glock_dq_uninit(&gh);
if (error) {
dput(d);
return ERR_PTR(error);
}
return d;
}
static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
unsigned flags)
{
return __gfs2_lookup(dir, dentry, NULL, NULL);
}
/**
* gfs2_link - Link to a file
* @old_dentry: The inode to link
* @dir: Add link to this directory
* @dentry: The name of the link
*
* Link the inode in "old_dentry" into the directory "dir" with the
* name in "dentry".
*
* Returns: errno
*/
static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
struct dentry *dentry)
{
struct gfs2_inode *dip = GFS2_I(dir);
struct gfs2_sbd *sdp = GFS2_SB(dir);
struct inode *inode = old_dentry->d_inode;
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_holder ghs[2];
struct buffer_head *dibh;
struct gfs2_diradd da = { .bh = NULL, };
int error;
if (S_ISDIR(inode->i_mode))
return -EPERM;
error = gfs2_rs_alloc(dip);
if (error)
return error;
gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
error = gfs2_glock_nq(ghs); /* parent */
if (error)
goto out_parent;
error = gfs2_glock_nq(ghs + 1); /* child */
if (error)
goto out_child;
error = -ENOENT;
if (inode->i_nlink == 0)
goto out_gunlock;
error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
if (error)
goto out_gunlock;
error = gfs2_dir_check(dir, &dentry->d_name, NULL);
switch (error) {
case -ENOENT:
break;
case 0:
error = -EEXIST;
default:
goto out_gunlock;
}
error = -EINVAL;
if (!dip->i_inode.i_nlink)
goto out_gunlock;
error = -EFBIG;
if (dip->i_entries == (u32)-1)
goto out_gunlock;
error = -EPERM;
if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
goto out_gunlock;
error = -EINVAL;
if (!ip->i_inode.i_nlink)
goto out_gunlock;
error = -EMLINK;
if (ip->i_inode.i_nlink == (u32)-1)
goto out_gunlock;
error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
if (error < 0)
goto out_gunlock;
if (da.nr_blocks) {
struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
error = gfs2_quota_lock_check(dip);
if (error)
goto out_gunlock;
error = gfs2_inplace_reserve(dip, &ap);
if (error)
goto out_gunlock_q;
error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
if (error)
goto out_ipres;
} else {
error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
if (error)
goto out_ipres;
}
error = gfs2_meta_inode_buffer(ip, &dibh);
if (error)
goto out_end_trans;
error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
if (error)
goto out_brelse;
gfs2_trans_add_meta(ip->i_gl, dibh);
inc_nlink(&ip->i_inode);
ip->i_inode.i_ctime = CURRENT_TIME;
ihold(inode);
d_instantiate(dentry, inode);
mark_inode_dirty(inode);
out_brelse:
brelse(dibh);
out_end_trans:
gfs2_trans_end(sdp);
out_ipres:
if (da.nr_blocks)
gfs2_inplace_release(dip);
out_gunlock_q:
if (da.nr_blocks)
gfs2_quota_unlock(dip);
out_gunlock:
gfs2_dir_no_add(&da);
gfs2_glock_dq(ghs + 1);
out_child:
gfs2_glock_dq(ghs);
out_parent:
gfs2_holder_uninit(ghs);
gfs2_holder_uninit(ghs + 1);
return error;
}
/*
* gfs2_unlink_ok - check to see that a inode is still in a directory
* @dip: the directory
* @name: the name of the file
* @ip: the inode
*
* Assumes that the lock on (at least) @dip is held.
*
* Returns: 0 if the parent/child relationship is correct, errno if it isn't
*/
static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
const struct gfs2_inode *ip)
{
int error;
if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
return -EPERM;
if ((dip->i_inode.i_mode & S_ISVTX) &&
!uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
!uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
return -EPERM;
if (IS_APPEND(&dip->i_inode))
return -EPERM;
error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
if (error)
return error;
error = gfs2_dir_check(&dip->i_inode, name, ip);
if (error)
return error;
return 0;
}
struct dentry *f2fs_get_parent(struct dentry *child)
{
struct qstr dotdot = {.len = 2, .name = ".."};
unsigned long ino = f2fs_inode_by_name(child->d_inode, &dotdot);
if (!ino)
return ERR_PTR(-ENOENT);
return d_obtain_alias(f2fs_iget(child->d_inode->i_sb, ino));
}
static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
struct nameidata *nd)
{
struct inode *inode = NULL;
struct f2fs_dir_entry *de;
struct page *page;
if (dentry->d_name.len > F2FS_NAME_LEN)
return ERR_PTR(-ENAMETOOLONG);
de = f2fs_find_entry(dir, &dentry->d_name, &page);
if (de) {
nid_t ino = le32_to_cpu(de->ino);
kunmap(page);
f2fs_put_page(page, 0);
inode = f2fs_iget(dir->i_sb, ino);
if (IS_ERR(inode))
return ERR_CAST(inode);
stat_inc_inline_inode(inode);
}
return d_splice_alias(inode, dentry);
}
static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
struct inode *inode = dentry->d_inode;
struct f2fs_dir_entry *de;
struct page *page;
int err = -ENOENT;
trace_f2fs_unlink_enter(dir, dentry);
f2fs_balance_fs(sbi);
de = f2fs_find_entry(dir, &dentry->d_name, &page);
if (!de)
goto fail;
f2fs_lock_op(sbi);
err = acquire_orphan_inode(sbi);
if (err) {
f2fs_unlock_op(sbi);
kunmap(page);
f2fs_put_page(page, 0);
goto fail;
}
f2fs_delete_entry(de, page, inode);
f2fs_unlock_op(sbi);
/* In order to evict this inode, we set it dirty */
mark_inode_dirty(inode);
fail:
trace_f2fs_unlink_exit(inode, err);
return err;
}
static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
const char *symname)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
struct inode *inode;
size_t symlen = strlen(symname) + 1;
int err;
f2fs_balance_fs(sbi);
inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
if (IS_ERR(inode))
return PTR_ERR(inode);
inode->i_op = &f2fs_symlink_inode_operations;
inode->i_mapping->a_ops = &f2fs_dblock_aops;
f2fs_lock_op(sbi);
err = f2fs_add_link(dentry, inode);
f2fs_unlock_op(sbi);
if (err)
goto out;
err = page_symlink(inode, symname, symlen);
alloc_nid_done(sbi, inode->i_ino);
d_instantiate(dentry, inode);
unlock_new_inode(inode);
return err;
out:
clear_nlink(inode);
iget_failed(inode);
alloc_nid_failed(sbi, inode->i_ino);
return err;
}
static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
struct inode *inode;
int err;
f2fs_balance_fs(sbi);
inode = f2fs_new_inode(dir, S_IFDIR | mode);
if (IS_ERR(inode))
return PTR_ERR(inode);
inode->i_op = &f2fs_dir_inode_operations;
inode->i_fop = &f2fs_dir_operations;
inode->i_mapping->a_ops = &f2fs_dblock_aops;
mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
set_inode_flag(F2FS_I(inode), FI_INC_LINK);
f2fs_lock_op(sbi);
err = f2fs_add_link(dentry, inode);
f2fs_unlock_op(sbi);
if (err)
goto out_fail;
alloc_nid_done(sbi, inode->i_ino);
d_instantiate(dentry, inode);
unlock_new_inode(inode);
return 0;
out_fail:
clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
clear_nlink(inode);
iget_failed(inode);
alloc_nid_failed(sbi, inode->i_ino);
return err;
}
static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
{
struct inode *inode = dentry->d_inode;
if (f2fs_empty_dir(inode))
return f2fs_unlink(dir, dentry);
return -ENOTEMPTY;
}
static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
umode_t mode, dev_t rdev)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
struct inode *inode;
int err = 0;
if (!new_valid_dev(rdev))
return -EINVAL;
f2fs_balance_fs(sbi);
inode = f2fs_new_inode(dir, mode);
if (IS_ERR(inode))
return PTR_ERR(inode);
init_special_inode(inode, inode->i_mode, rdev);
inode->i_op = &f2fs_special_inode_operations;
f2fs_lock_op(sbi);
err = f2fs_add_link(dentry, inode);
f2fs_unlock_op(sbi);
if (err)
goto out;
alloc_nid_done(sbi, inode->i_ino);
d_instantiate(dentry, inode);
unlock_new_inode(inode);
return 0;
out:
clear_nlink(inode);
iget_failed(inode);
alloc_nid_failed(sbi, inode->i_ino);
return err;
}
static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
struct inode *old_inode = old_dentry->d_inode;
struct inode *new_inode = new_dentry->d_inode;
struct page *old_dir_page;
struct page *old_page, *new_page;
struct f2fs_dir_entry *old_dir_entry = NULL;
struct f2fs_dir_entry *old_entry;
struct f2fs_dir_entry *new_entry;
int err = -ENOENT;
f2fs_balance_fs(sbi);
old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
if (!old_entry)
goto out;
if (S_ISDIR(old_inode->i_mode)) {
err = -EIO;
old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
if (!old_dir_entry)
goto out_old;
}
if (new_inode) {
err = -ENOTEMPTY;
if (old_dir_entry && !f2fs_empty_dir(new_inode))
goto out_dir;
err = -ENOENT;
new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
&new_page);
if (!new_entry)
goto out_dir;
f2fs_lock_op(sbi);
err = acquire_orphan_inode(sbi);
if (err)
goto put_out_dir;
if (update_dent_inode(old_inode, &new_dentry->d_name)) {
release_orphan_inode(sbi);
goto put_out_dir;
}
f2fs_set_link(new_dir, new_entry, new_page, old_inode);
new_inode->i_ctime = CURRENT_TIME;
down_write(&F2FS_I(new_inode)->i_sem);
if (old_dir_entry)
drop_nlink(new_inode);
drop_nlink(new_inode);
up_write(&F2FS_I(new_inode)->i_sem);
mark_inode_dirty(new_inode);
if (!new_inode->i_nlink)
add_orphan_inode(sbi, new_inode->i_ino);
else
release_orphan_inode(sbi);
update_inode_page(old_inode);
update_inode_page(new_inode);
} else {
f2fs_lock_op(sbi);
err = f2fs_add_link(new_dentry, old_inode);
if (err) {
f2fs_unlock_op(sbi);
goto out_dir;
}
if (old_dir_entry) {
inc_nlink(new_dir);
update_inode_page(new_dir);
}
}
down_write(&F2FS_I(old_inode)->i_sem);
file_lost_pino(old_inode);
up_write(&F2FS_I(old_inode)->i_sem);
old_inode->i_ctime = CURRENT_TIME;
mark_inode_dirty(old_inode);
f2fs_delete_entry(old_entry, old_page, NULL);
if (old_dir_entry) {
if (old_dir != new_dir) {
f2fs_set_link(old_inode, old_dir_entry,
old_dir_page, new_dir);
update_inode_page(old_inode);
} else {
kunmap(old_dir_page);
f2fs_put_page(old_dir_page, 0);
}
drop_nlink(old_dir);
mark_inode_dirty(old_dir);
update_inode_page(old_dir);
}
f2fs_unlock_op(sbi);
return 0;
put_out_dir:
f2fs_unlock_op(sbi);
kunmap(new_page);
f2fs_put_page(new_page, 0);
out_dir:
if (old_dir_entry) {
kunmap(old_dir_page);
f2fs_put_page(old_dir_page, 0);
}
out_old:
kunmap(old_page);
f2fs_put_page(old_page, 0);
out:
return err;
}
const struct inode_operations f2fs_dir_inode_operations = {
.create = f2fs_create,
.lookup = f2fs_lookup,
.link = f2fs_link,
.unlink = f2fs_unlink,
.symlink = f2fs_symlink,
.mkdir = f2fs_mkdir,
.rmdir = f2fs_rmdir,
.mknod = f2fs_mknod,
.rename = f2fs_rename,
.getattr = f2fs_getattr,
.setattr = f2fs_setattr,
.get_acl = f2fs_get_acl,
#ifdef CONFIG_F2FS_FS_XATTR
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.listxattr = f2fs_listxattr,
.removexattr = generic_removexattr,
#endif
};
const struct inode_operations f2fs_symlink_inode_operations = {
.readlink = generic_readlink,
.follow_link = page_follow_link_light,
.put_link = page_put_link,
.getattr = f2fs_getattr,
.setattr = f2fs_setattr,
#ifdef CONFIG_F2FS_FS_XATTR
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.listxattr = f2fs_listxattr,
.removexattr = generic_removexattr,
#endif
};
const struct inode_operations f2fs_special_inode_operations = {
.getattr = f2fs_getattr,
.setattr = f2fs_setattr,
.get_acl = f2fs_get_acl,
#ifdef CONFIG_F2FS_FS_XATTR
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.listxattr = f2fs_listxattr,
.removexattr = generic_removexattr,
#endif
};
