/*
* Find the dentry that matches "name". If there isn't one, create one. If it's
* a negative dentry or the uniqueid changed, then drop it and recreate it.
*/
static struct dentry *
cifs_readdir_lookup(struct dentry *parent, struct qstr *name,
struct cifs_fattr *fattr)
{
struct dentry *dentry, *alias;
struct inode *inode;
struct super_block *sb = parent->d_inode->i_sb;
cFYI(1, "For %s", name->name);
if (parent->d_op && parent->d_op->d_hash)
parent->d_op->d_hash(parent, parent->d_inode, name);
else
name->hash = full_name_hash(name->name, name->len);
dentry = d_lookup(parent, name);
if (dentry) {
inode = dentry->d_inode;
/* update inode in place if i_ino didn't change */
if (inode && CIFS_I(inode)->uniqueid == fattr->cf_uniqueid) {
cifs_fattr_to_inode(inode, fattr);
return dentry;
}
d_drop(dentry);
dput(dentry);
}
/*
* If we know that the inode will need to be revalidated immediately,
* then don't create a new dentry for it. We'll end up doing an on
* the wire call either way and this spares us an invalidation.
*/
if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL)
return NULL;
dentry = d_alloc(parent, name);
if (dentry == NULL)
return NULL;
inode = cifs_iget(sb, fattr);
if (!inode) {
dput(dentry);
return NULL;
}
alias = d_materialise_unique(dentry, inode);
if (alias != NULL) {
dput(dentry);
if (IS_ERR(alias))
return NULL;
dentry = alias;
}
return dentry;
}
/*
* Attempt to preload the dcache with the results from the FIND_FIRST/NEXT
*
* Find the dentry that matches "name". If there isn't one, create one. If it's
* a negative dentry or the uniqueid changed, then drop it and recreate it.
*/
static void
cifs_prime_dcache(struct dentry *parent, struct qstr *name,
struct cifs_fattr *fattr)
{
struct dentry *dentry, *alias;
struct inode *inode;
struct super_block *sb = parent->d_inode->i_sb;
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
cFYI(1, "%s: for %s", __func__, name->name);
dentry = d_hash_and_lookup(parent, name);
if (unlikely(IS_ERR(dentry)))
return;
if (dentry) {
int err;
inode = dentry->d_inode;
if (inode) {
/*
* If we're generating inode numbers, then we don't
* want to clobber the existing one with the one that
* the readdir code created.
*/
if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM))
fattr->cf_uniqueid = CIFS_I(inode)->uniqueid;
/* update inode in place if i_ino didn't change */
if (CIFS_I(inode)->uniqueid == fattr->cf_uniqueid) {
cifs_fattr_to_inode(inode, fattr);
goto out;
}
}
err = d_invalidate(dentry);
dput(dentry);
if (err)
return;
}
dentry = d_alloc(parent, name);
if (!dentry)
return;
inode = cifs_iget(sb, fattr);
if (!inode)
goto out;
alias = d_materialise_unique(dentry, inode);
if (alias && !IS_ERR(alias))
dput(alias);
out:
dput(dentry);
}
static struct dentry *
cifs_readdir_lookup(struct dentry *parent, struct qstr *name,
struct cifs_fattr *fattr)
{
struct dentry *dentry, *alias;
struct inode *inode;
struct super_block *sb = parent->d_inode->i_sb;
cFYI(1, "For %s", name->name);
if (parent->d_op && parent->d_op->d_hash)
parent->d_op->d_hash(parent, parent->d_inode, name);
else
name->hash = full_name_hash(name->name, name->len);
dentry = d_lookup(parent, name);
if (dentry) {
inode = dentry->d_inode;
/* update inode in place if i_ino didn't change */
if (inode && CIFS_I(inode)->uniqueid == fattr->cf_uniqueid) {
cifs_fattr_to_inode(inode, fattr);
return dentry;
}
d_drop(dentry);
dput(dentry);
}
dentry = d_alloc(parent, name);
if (dentry == NULL)
return NULL;
inode = cifs_iget(sb, fattr);
if (!inode) {
dput(dentry);
return NULL;
}
alias = d_materialise_unique(dentry, inode);
if (alias != NULL) {
dput(dentry);
if (IS_ERR(alias))
return NULL;
dentry = alias;
}
return dentry;
}
/*
* Attempt to preload the dcache with the results from the FIND_FIRST/NEXT
*
* Find the dentry that matches "name". If there isn't one, create one. If it's
* a negative dentry or the uniqueid or filetype(mode) changed,
* then drop it and recreate it.
*/
static void
cifs_prime_dcache(struct dentry *parent, struct qstr *name,
struct cifs_fattr *fattr)
{
struct dentry *dentry, *alias;
struct inode *inode;
struct super_block *sb = parent->d_inode->i_sb;
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
cifs_dbg(FYI, "%s: for %s\n", __func__, name->name);
dentry = d_hash_and_lookup(parent, name);
if (unlikely(IS_ERR(dentry)))
return;
if (dentry) {
inode = dentry->d_inode;
if (inode) {
/*
* If we're generating inode numbers, then we don't
* want to clobber the existing one with the one that
* the readdir code created.
*/
if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM))
fattr->cf_uniqueid = CIFS_I(inode)->uniqueid;
/* update inode in place
* if both i_ino and i_mode didn't change */
if (CIFS_I(inode)->uniqueid == fattr->cf_uniqueid &&
(inode->i_mode & S_IFMT) ==
(fattr->cf_mode & S_IFMT)) {
cifs_fattr_to_inode(inode, fattr);
goto out;
}
}
d_invalidate(dentry);
dput(dentry);
}
/*
* If we know that the inode will need to be revalidated immediately,
* then don't create a new dentry for it. We'll end up doing an on
* the wire call either way and this spares us an invalidation.
*/
if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL)
return;
dentry = d_alloc(parent, name);
if (!dentry)
return;
inode = cifs_iget(sb, fattr);
if (!inode)
goto out;
alias = d_splice_alias(inode, dentry);
if (alias && !IS_ERR(alias))
dput(alias);
out:
dput(dentry);
}
int cifs_posix_open(char *full_path, struct inode **pinode,
struct super_block *sb, int mode, int oflags,
__u32 *poplock, __u16 *pnetfid, int xid)
{
int rc;
FILE_UNIX_BASIC_INFO *presp_data;
__u32 posix_flags = 0;
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
struct cifs_fattr fattr;
cFYI(1, "posix open %s", full_path);
presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
if (presp_data == NULL)
return -ENOMEM;
/* So far cifs posix extensions can only map the following flags.
There are other valid fmode oflags such as FMODE_LSEEK, FMODE_PREAD, but
so far we do not seem to need them, and we can treat them as local only */
if ((oflags & (FMODE_READ | FMODE_WRITE)) ==
(FMODE_READ | FMODE_WRITE))
posix_flags = SMB_O_RDWR;
else if (oflags & FMODE_READ)
posix_flags = SMB_O_RDONLY;
else if (oflags & FMODE_WRITE)
posix_flags = SMB_O_WRONLY;
if (oflags & O_CREAT)
posix_flags |= SMB_O_CREAT;
if (oflags & O_EXCL)
posix_flags |= SMB_O_EXCL;
if (oflags & O_TRUNC)
posix_flags |= SMB_O_TRUNC;
/* be safe and imply O_SYNC for O_DSYNC */
if (oflags & O_DSYNC)
posix_flags |= SMB_O_SYNC;
if (oflags & O_DIRECTORY)
posix_flags |= SMB_O_DIRECTORY;
if (oflags & O_NOFOLLOW)
posix_flags |= SMB_O_NOFOLLOW;
if (oflags & O_DIRECT)
posix_flags |= SMB_O_DIRECT;
mode &= ~current_umask();
rc = CIFSPOSIXCreate(xid, cifs_sb->tcon, posix_flags, mode,
pnetfid, presp_data, poplock, full_path,
cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
CIFS_MOUNT_MAP_SPECIAL_CHR);
if (rc)
goto posix_open_ret;
if (presp_data->Type == cpu_to_le32(-1))
goto posix_open_ret; /* open ok, caller does qpathinfo */
if (!pinode)
goto posix_open_ret; /* caller does not need info */
cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb);
/* get new inode and set it up */
if (*pinode == NULL) {
cifs_fill_uniqueid(sb, &fattr);
*pinode = cifs_iget(sb, &fattr);
if (!*pinode) {
rc = -ENOMEM;
goto posix_open_ret;
}
} else {
cifs_fattr_to_inode(*pinode, &fattr);
}
posix_open_ret:
kfree(presp_data);
return rc;
}
