lf_hfs_vnode.c   [plain text]

/*  Copyright © 2017-2018 Apple Inc. All rights reserved.
 *
 *  lf_hfs_vnode.c
 *  livefiles_hfs
 *
 *  Created by Or Haimovich on 20/3/18.
 */

#include "lf_hfs_vnode.h"
#include "lf_hfs_utils.h"
#include "lf_hfs_vfsutils.h"
#include "lf_hfs_generic_buf.h"
#include "lf_hfs_fileops_handler.h"

int VTtoUVFS_tab[16] =
{
    VNON,
    /* 1 - 5 */
    UVFS_FA_TYPE_FILE, UVFS_FA_TYPE_DIR, VNON, VNON, UVFS_FA_TYPE_SYMLINK,
    /* 6 - 10 */
    VNON, VNON, VNON, VNON, VNON
};

enum vtype iftovt_tab[16] =
{
    VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON,
    VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VBAD,
};

int uvfsToVtype_tab[4] =
{
    VNON,VREG,VDIR,VLNK,
};

mode_t  vttoif_tab[9] =
{
    0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK,
    S_IFSOCK, S_IFIFO, S_IFMT,
};

errno_t vnode_initialize(uint32_t size, void *data, vnode_t *vpp)
{
    memset(*vpp,0,sizeof(struct vnode));
    (*vpp)->cnode = NULL;
    assert(size == sizeof((*vpp)->sFSParams));
    memcpy((void *) &(*vpp)->sFSParams,data,size);

    if ((*vpp)->sFSParams.vnfs_vtype == VDIR)
    {
        (*vpp)->sExtraData.sDirData.uDirVersion = 1;
    }
    return 0;
}

errno_t vnode_create(uint32_t size, void  *data, vnode_t *vpp)
{
    *vpp = hfs_malloc(sizeof(struct vnode));
    if (*vpp == NULL)
    {
        return ENOMEM;
    }

    return (vnode_initialize(size, data, vpp));
}

void vnode_rele(vnode_t vp)
{
    if (vp) {
        lf_hfs_generic_buf_cache_LockBufCache();
        lf_hfs_generic_buf_cache_remove_vnode(vp);
        lf_hfs_generic_buf_cache_UnLockBufCache();
        hfs_free(vp);
    }
    vp = NULL;
}

mount_t vnode_mount(vnode_t vp)
{
    return (vp->sFSParams.vnfs_mp);
}

int vnode_issystem(vnode_t vp)
{
    return (vp->sFSParams.vnfs_marksystem);
}

int vnode_isreg(vnode_t vp)
{
    return (vp->sFSParams.vnfs_vtype == VREG);
}

int vnode_isdir(vnode_t vp)
{
    return (vp->sFSParams.vnfs_vtype == VDIR);
}

int vnode_islnk(vnode_t vp)
{
    return (vp->sFSParams.vnfs_vtype == VLNK);
}

/*!
 @function vnode_update_identity
 case:
    VNODE_UPDATE_PARENT: set parent.
    VNODE_UPDATE_NAME: set name.
    VNODE_UPDATE_CACHE: flush cache entries for hard links associated with this file.

 
 */
void vnode_update_identity(vnode_t vp, vnode_t dvp, const char *name, int name_len, uint32_t name_hashval, int flags)
{
    if (flags & VNODE_UPDATE_PARENT)
    {
        vp->sFSParams.vnfs_dvp = dvp;
    }

    if (flags & VNODE_UPDATE_NAME)
    {
        if (!vp->sFSParams.vnfs_cnp) {
            vp->sFSParams.vnfs_cnp = hfs_malloc(sizeof(struct componentname));
            if (vp->sFSParams.vnfs_cnp == NULL) {
                LFHFS_LOG(LEVEL_ERROR, "vnode_update_identity: failed to malloc vnfs_cnp\n");
                assert(0);
            }
        }
        vp->sFSParams.vnfs_cnp->cn_namelen = name_len;
        if (vp->sFSParams.vnfs_cnp->cn_nameptr) {
            hfs_free(vp->sFSParams.vnfs_cnp->cn_nameptr);
        }
        vp->sFSParams.vnfs_cnp->cn_nameptr = lf_hfs_utils_allocate_and_copy_string( (char*) name, name_len );
        vp->sFSParams.vnfs_cnp->cn_hash = name_hashval;
    }
}

void vnode_GetAttrInternal (vnode_t vp, UVFSFileAttributes *psOutAttr )
{
    struct cnode *cp = VTOC(vp);
    enum vtype v_type;
    
    memset( psOutAttr, 0, sizeof(UVFSFileAttributes) );
    
    psOutAttr->fa_validmask     = VALID_OUT_ATTR_MASK;
    
    psOutAttr->fa_gid   = cp->c_gid;
    psOutAttr->fa_uid   = cp->c_uid;
    psOutAttr->fa_mode  = cp->c_mode & ALL_UVFS_MODES;
    
    v_type = vp->sFSParams.vnfs_vtype;
    psOutAttr->fa_type = VTOUVFS(v_type);
    
    psOutAttr->fa_atime.tv_sec  = cp->c_atime;
    psOutAttr->fa_ctime.tv_sec  = cp->c_ctime;
    psOutAttr->fa_mtime.tv_sec  = cp->c_mtime;
    psOutAttr->fa_birthtime.tv_sec  = cp->c_btime;
    
    psOutAttr->fa_fileid        = cp->c_fileid;
    psOutAttr->fa_parentid      = cp->c_parentcnid;
    psOutAttr->fa_bsd_flags     = cp->c_bsdflags;
    
    if (v_type == VDIR)
    {
        psOutAttr->fa_allocsize = 0;
        psOutAttr->fa_size      = (cp->c_entries + 2) * AVERAGE_HFSDIRENTRY_SIZE;
        psOutAttr->fa_nlink     = cp->c_entries + 2;
    }
    else
    {
        psOutAttr->fa_allocsize = VCTOF(vp, cp)->ff_blocks * VTOHFS(vp)->blockSize;
        psOutAttr->fa_size      = VCTOF(vp, cp)->ff_size;
        psOutAttr->fa_nlink     = (cp->c_flag & C_HARDLINK)? cp->c_linkcount : 1;
    }
}