VFS Implementation

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VFS Nodes

Module Name Comment
SceSdstor sdstor_dev_fs
SceExfatfs exfat
SceIofilemgr dummy_ttyp_dev_fs
ScePfsMgr PFS_REDIRECT_INF Redirect Pseudo Drive.
ScePfsMgr PFS_GDSD_INF Gamedata/Savedata Pseudo Drive.
ScePfsMgr PFS_AC_INF AC Pseudo Drive.

VFS Operations

  • implemented operation is marked as implemented
  • not implemented is marked as
  • return 0 placeholder is marked as 0
  • return error is marked with corresponding error name
Function sdstor_dev_fs exfat dummy_ttyp_dev_fs PFS_REDIRECT_INF PFS_GDSD_INF PFS_AC_INF
1 implemented implemented implemented implemented implemented implemented
2 SCE_ERROR_ERRNO_EBUSY implemented 0 implemented implemented implemented
3 implemented implemented implemented implemented implemented implemented
4 implemented
5
6
7 implemented 0 implemented implemented
8
9 0 0 0 0 0 0
10 0 0 0 0 0
11
12 implemented implemented implemented implemented implemented
13 implemented implemented implemented implemented implemented

VFS Node Operations

  • implemented operation is marked as implemented
  • not implemented is marked as
  • return 0 placeholder is marked as 0
  • return error is marked with corresponding error name
Function sdstor_dev_fs exfat dummy_ttyp_dev_fs PFS_REDIRECT_INF PFS_GDSD_INF PFS_AC_INF
1 implemented implemented 0 implemented implemented implemented
2 implemented implemented implemented implemented
3 implemented implemented 0 implemented implemented implemented
4 implemented implemented implemented implemented implemented implemented
5 implemented implemented 0 implemented implemented implemented
6 implemented implemented implemented implemented implemented implemented
7 implemented implemented 0 implemented implemented implemented
8 SCE_ERROR_ERRNO_EUNSUP 0 implemented implemented implemented
9 implemented implemented implemented implemented implemented
10 implemented implemented implemented implemented
11 implemented implemented implemented implemented
12 implemented implemented implemented implemented
13 implemented implemented implemented implemented
14 implemented implemented implemented implemented
15 implemented implemented implemented implemented
16 implemented implemented implemented implemented
17 implemented implemented implemented implemented
18
19 implemented implemented implemented implemented implemented
20 implemented implemented implemented implemented implemented
21 0 implemented 0 implemented implemented implemented
22 implemented
23 implemented
24 0 implemented implemented implemented implemented
25 implemented implemented implemented implemented
26 implemented implemented implemented implemented
27 implemented implemented implemented implemented
28 implemented implemented implemented implemented
29

Typical i/o operation execution

This is a very brief desctiption for overall understanding of io vfs_node operations. Implementation of SceIofilemgr is quite solid and most of the functions are implemented in the same manner however there could be exceptions. When io operation like sceIoLseek is called here is what happens:

  • all user space arguments are copied to kernel space, usually onto the kernel stack. all user space uids are converted to kernel space uids
  • optionally control may be passed to wrapper function that also does conversion
  • then control is passed to kernel level function like sceIoLseekForDriver
  • kernel level function checks 0x2198 (IoSchedulerDispatcher initialized) flag

if dispatcher is not initialized:

  • kernel level function updates 0x1964 (i/o dirty) and 0x1980 (i/o counter) flags
  • kernel level function spawns separate thread and passes all arguments in single structure
  • separate thread then unpacks all arguments, finds vfs_node and calls exported function like vfs_node_func7
  • exported function packs all arguments into single stucture and calls real callback since it has vfs_node with node operation table
  • callback routine should be located in generic device driver, like SceSdstor, SceExfatfs or ScePfsMgr. It unpacks the arguments and then does something. For example SceSdstor dispatches the call further to SceSdif, SceWlanBt, SceMsif and SceUsbMass.
  • kernel level function updates 0x1980 (i/o counter) flag

if dispatcher is initialized:

  • kernel level function passes arguments to wrapper
  • wrapper initializes io_contex and assigns i/o operation index
  • wrapper updates 0x1964 (i/o dirty) and 0x1980 (i/o counter) flags
  • wrapper runs dispatcher function (offset 0x17C00) in separate thread. this function selects proper vfs_node function based on i/o operation index.
  • wrapper updates 0x1980 (i/o counter) flag

i/o operation index

Typically operations are dispatched from kernel functions.

However there are exceptions: sceIoLseek32, sceIoDopenAsync, sceIoDreadAsync, sceIoDcloseAsync user functions can be dispatched.

Typically operations have normal and async version - regulated by async flag in io_context.

However there are exceptions: sceIoLseek32, sceIoIoctlForDriver, sceIoDevctlForDriver, sceIoGetstatForDriver_2, sceIoChstatForDriver_2, sceIoDreadForDriver_2 do not have async version.

Index Normal Operation Async Operation Vfs Node Function Vfs Function
1 sceIoOpenForDriver sceIoOpenAsyncForDriver
2 sceIoCloseForDriver sceIoCloseAsyncForDriver
3 sceIoReadForDriver sceIoReadAsyncForDriver 5 N/A
4 sceIoWriteForDriver sceIoWriteAsyncForDriver 6 N/A
5 sceIoLseekForDriver sceIoLseekAsyncForDriver 7 N/A
6 sceIoLseek32 N/A 7 N/A
7 sceIoIoctlForDriver N/A 8 N/A
8 sceIoRemoveForDriver sceIoRemoveAsyncForDriver 27 N/A
9 sceIoDopenForDriver sceIoDopenAsyncForDriver 12 N/A
10 sceIoDcloseForDriver sceIoDcloseAsyncForDriver 13 N/A
11 sceIoDreadForDriver sceIoDreadAsyncForDriver 14 N/A
12 sceIoMkdirForDriver sceIoMkdirAsyncForDriver 10 N/A
13 sceIoRmdirForDriver sceIoRmdirAsyncForDriver 11 N/A
14 sceIoRenameForDriver sceIoRenameAsyncForDriver 17 N/A
15 sceIoChstatForDriver sceIoChstatAsyncForDriver 16 N/A
16 sceIoChstatByFdForDriver sceIoChstatByFdAsyncForDriver 26 N/A
17 sceIoGetstatForDriver sceIoGetstatAsyncForDriver 15 N/A
18 sceIoGetstatByFdForDriver sceIoGetstatByFdAsyncForDriver 25 N/A
19 sceIoDevctlForDriver N/A N/A 12
20 sceIoSyncForDriver sceIoSyncAsyncForDriver 24 N/A
21 sceIoSyncByFdForDriver sceIoSyncByFdAsyncForDriver 24 N/A
22 sceIoPreadForDriver sceIoPreadAsyncForDriver 19 N/A
23 sceIoPwriteForDriver sceIoPwriteAsyncForDriver 20 N/A
24 sceIoGetstatForDriver_2 N/A 15 N/A
25 sceIoChstatForDriver_2 N/A 16 N/A
26 sceIoDreadForDriver_2 N/A 14 N/A
27 N/A sceIoDopenAsync
28 N/A sceIoDreadAsync
29 N/A sceIoDcloseAsync

Types

//probably vfsops
struct node_ops1 // size is 0x34 (13 pointers)
{
  int (*func1)(void* ctx);
  int (*func2)(void* ctx); // ?
  int (*func3)(void* ctx);
  int (*func4)(void* ctx);
  int (*func5)(void* ctx); // not implemented by all
  int (*func6)(void* ctx); // not implemented by all
  int (*func7)(void* ctx);
  int (*func8)(void* ctx); // not implemented by all
  int (*func9)(void* ctx); // called by sceVfsAddVfs
  int (*func10)(void* ctx); // called by sceVfsDeleteVfs
  int (*func11)(void* ctx); // not implemented by all
  int (*func12)(void* ctx); // sceIoDevctlForDriver
  int (*func13)(void* ctx); // (initialize partition entry in table)(map block device name on numeric name)
};

//probably vnodeops
struct node_ops2 // size is 0x74 (29 pointers)
{
  int (*func1)(void* ctx); // sceIoOpenForDriver (this function creates device handle) (It operates with normal block device name and unix mount)
  int (*func2)(void* ctx); // sceIoOpenForDriver (another one ?)
  int (*func3)(void* ctx); // sceIoOpenForDriver (another one ?) or sceIoCloseForDriver
  int (*func4)(void* ctx); // add partition (add vfsNode) (initialize partition entry in table) (for example happens on card insert exclusively) (operates with numeric names)
  int (*func5)(void* ctx); // sceIoReadForDriver
  int (*func6)(void* ctx); // sceIoWriteForDriver
  int (*func7)(void* ctx); // sceIoLseekForDriver or sceIoLseek32?
  int (*func8)(void* ctx); // sceIoIoctlForDriver
  int (*func9)(void* ctx); // remove partition (remove vfsNode) (deinitialize partition entry in table) (for example happens on card remove exclusively) (operates with numeric names)
  int (*func10)(void* ctx); // sceIoMkdirForDriver
  int (*func11)(void* ctx); // sceIoRmdirForDriver
  int (*func12)(void* ctx); // sceIoDopenForDriver
  int (*func13)(void* ctx); // sceIoDcloseForDriver
  int (*func14)(void* ctx); // sceIoDreadForDriver
  int (*func15)(void* ctx); // sceIoGetstatForDriver or sceIoGetstatByFdForDriver
  int (*func16)(void* ctx); // sceIoChstatForDriver or sceIoChstatByFdForDriver
  int (*func17)(void* ctx); // sceIoRenameForDriver
  int (*func18)(void* ctx); // not implemented by all
  int (*func19)(void* ctx); // sceIoPreadForDriver
  int (*func20)(void* ctx); // sceIoPwriteForDriver
  int (*func21)(void* ctx); // ?
  int (*func22)(void* ctx); // not referenced
  int (*func23)(void* ctx); // not referenced
  int (*func24)(void* ctx); // sceIoSyncForDriver or sceIoSyncByFdForDriver
  int (*func25)(void* ctx); // sceIoGetstatByFdForDriver
  int (*func26)(void* ctx); // sceIoChstatByFdForDriver
  int (*func27)(void* ctx); // ?
  int (*func28)(void* ctx); // ?
  int (*func29)(void* ctx); // not implemented by all
};

struct vfs_unmount_data
{
    const char *mountpoint;
    int flags;
};

typedef struct vfs_block_dev_info //size is 0x14
{
  char* vitaMount;
  char* filesystem; // Some name, I guess it is filesystem
  char* blockDevicePrimary;
  char* blockDeviceSecondary; // can be 0
  uint32_t vshMountId; //must be same as in mount_point_info
}vfs_block_dev_info;

typedef struct vfs_mount_point_info_base
{
  char* unixMount;
  char* originalPath;
  uint32_t devMajor;
  uint32_t devMinor;

  char* filesystem;
  pfs_pmi_buffer_list_ctx* bcl; //holds klicensee
  vfs_block_dev_info* blockDev1;
  uint32_t unk_1C; //zero
} vfs_mount_point_info_base;

typedef struct vfs_mount_point_info //size is 0x38
{
  uint32_t vshMountId;
  
  vfs_mount_point_info_base base;

  vfs_block_dev_info* blockDev2; //same as blockDev1
  
  uint32_t unk_28; //zero - except for (ux0:, gro0:, grw0:) - maybe related to device specific data?
  uint32_t unk_2C; //zero
  
  uint32_t unk_30; //zero
  uint32_t unk_34; //zero
}vfs_mount_point_info;

struct vfs_add_data
{
    node_ops1* funcs1;
    const char *name; //exfat etc. max size is 0x20
    int flags; //0x0E
    int unk_C; //0x01 / 0x00 (root, leaf ?)
    
    int unk_10; //0x10
    node_ops2* funcs2;
    int unk_18; //0x00
    vfs_add_data* next_element; //ptr to next element, confirmed
};

typedef struct vfs_fd_lock
{
   SceUID mutex_SceVfsFdLock;
   SceUID cond_SceVfsFdCond;
   uint32_t unk_8;
   uint32_t unk_C;

} vfs_fd_lock;

typedef struct vfs_mount_cc
{
   node_ops2* ops; // only functions 3, 13, 21 are available. everything else should give 0x80010013
   uint32_t dirty; // (1/0) checked on suspend
   uint32_t* flag; // (1/0) shows if wait for eventFlag should be called or not
                   // pointer to data section, offset 3C, 38 or 2C
   SceUID* eventFlag; // pointer to data section, offset 30, 20 or 28
} vfs_mount_cc;

typedef struct vfs_mount //size is not known exactly, at least 0xD0 + 0x10 + 0x10
{
   uint32_t fast_mutex_SceVfsMnt;

   uint32_t unk_4;
   uint32_t unk_8;
   uint32_t unk_C;

   uint8_t data1[0x30];

   vfs_node* unk_40; // child ?

   SceUID pool;     // 0x44 - SceIoVfsHeap

   uint32_t unk_48; // = 0x101
   
   union _devMajor
   {
      struct _dmDword
      {
         uint32_t unk_4C;
      } dw;
      struct _dmWord
      {
         uint16_t unk_4C;
         uint16_t unk_4E;
      } w;
      struct _dmByte
      {
         uint8_t unk_4C;
         uint8_t unk_4D;
         uint8_t unk_4E;
         uint8_t unk_4F;
      } b;
   } devMajor;

   uint32_t devMinor; // 0x50

   vfs_node* unk_54;
   uint32_t unk_58;   // counter
   vfs_add_data* add_data; // 0x5C

   uint32_t unk_60;   // counter

   uint32_t unk_64;
   uint32_t unk_68;
   uint32_t unk_6C;

   vfs_mount* unk_70; // next ?
   vfs_mount* unk_74; // prev ?

   vfs_mount* unk_78; //singly linked list related to pointer 19D0 in data section

   vfs_block_dev_info* blockDev; // 0x7C

   char unixMount[0x40]; // 0x80 /gro/exfat, /ux/exfat etc

   uint32_t unk_C0;   

   pfs_pmi_buffer_list_ctx* bcl; // C4 - from vfs_mount_point_info_base

   vfs_fd_lock* fd_lock_ptr; // C8 - points to area in this structure

   vfs_mount_cc* unk_CC; // CC - points to area in this structure

   vfs_fd_lock fd_lock; // D0

   vfs_mount_cc unk_E0; //E0;

} vfs_mount;

//this structure contains device specific data
//this definition applies only to SceSdif driver
//it is yet unknown what data is stored by SceExfatfs, ScePfsMgr and SceIofilemgr implementations

struct vfs_device_info //size is 0xC
{
   partition_entry* partition;
   sd_stor_device* device;
   uint32_t unk_8;
} vfs_device_info;

struct child_node_info
{
  vfs_node* node;
} child_node_info;

typedef struct vfs_node_70
{
   uint32_t unk_0;
   uint32_t unk_4;
   uint32_t unk_8;
   vfs_node_70* unk_C; //zero or pointer to next element

   void* unk_10; //pointer to struct of at least size 0x94
   uint32_t unk_14; //number
   uint32_t len; // 18
   char* data; // 1C
} vfs_node_70;

struct vfs_node //size is 0x100
{
   uint32_t unk_0;
   uint32_t unk_4;  // most likely SceUID of current thread
   uint32_t unk_8;  // counter
   SceUID event_flag_SceVfsVnode; // 0xC - event flag SceVfsVnode

   uint32_t evid_bits; // 0x10
   uint32_t unk_14;
   uint32_t unk_18;
   uint32_t unk_1C;

   uint8_t data1[0x20];
   
   node_ops2 *ops;  // 0x40
   uint32_t unk_44;
   void* dev_info;  //allocated on heap with uid from uid field
                    //this is device specific / node specific data
                    //for partition node this will be vfs_device_info*
                    
                    //for pfs node it looks like to be child_node_info* 
                    //which probably points to partition node

   vfs_mount* node; // 0x4C

   vfs_node* prev_node; // 0x50

   vfs_node* unk_54; // copied from node base - singly linked list
   uint32_t unk_58;  // counter - probably counter of nodes
   void* unk_5C;

   uint32_t unk_60;
   uint32_t unk_64;
   uint32_t unk_68;
   SceUID pool_uid;  // 0x6C - SceIoVfsHeap or other pool

   vfs_node_70* unk_70;
   uint32_t unk_74; // = 0x8000
   uint32_t unk_78; // some flag
   uint32_t unk_7C;

   uint32_t unk_80;
   uint32_t unk_84;
   uint32_t unk_88;
   uint32_t unk_8C;

   uint32_t unk_90; //void* objectBase ?
   uint32_t unk_94;
   vfs_node* unk_98; //some child node
   uint32_t unk_9C;

   uint8_t data2[0x30];
   
   uint32_t unk_D0; // devMajor.w.unk_4E

   uint8_t data3[0x2C];

}vfs_node;

//this one is acquired by sceKernelGetObjForUid using SceUID file descriptor
//then add offset 8 to that object base since first 8 bytes are reserved

typedef struct vfs_object_base
{
   uint32_t unk_0;
   uint32_t unk_4;
   SceOff offset; //for example used in Read/Pread
   
   uint32_t unk_10;
   uint32_t unk_14;
   vfs_node* unk_18;
   uint32_t unk_1C;
   
   uint32_t unk_20;
   uint32_t unk_24;
   uint32_t unk_28;
   uint32_t unk_2C;
   
}vfs_object_base;

SceIofilemgrForDriver vfs callbacks

Vfs callbacks are harder to reverse since it looks like not all of them are exported. Looks like some of them are not even exposed as subroutines.

Here will go an attempt to desctibe interface of actual callbacks with single ctx argument (as opposed to exported functions that pack arguments into ctx)

vfs_func1


typedef struct vfs_func1_args
{
   vfs_mount* arg0;
   void* arg1;
}vfs_func1_args;

int vfs_func1(vfs_func1_args* ctx)

vfs_func2

typedef struct vfs_func2_args
{
   //fields are yet unknown
}vfs_func2_args;

int vfs_func2(vfs_func2_args* ctx)

vfs_func3


typedef struct vfs_func3_args
{
   vfs_mount* arg0;
   uint32_t arg1;
   vfs_node* arg2;

}vfs_func3_args;

int vfs_func3(vfs_func3_args* ctx)

vfs_func4

typedef struct vfs_func4_args
{
  vfs_node *node;
  uint32_t unk_4;
  uint32_t unk_8;

  //more fields?

}vfs_func4_args;

int vfs_func4(vfs_func4_args* ctx)

vfs_func7

typedef struct vfs_func7_args
{
   //fields are yet unknown
}vfs_func7_args;

int vfs_func7(vfs_func7_args* ctx)

vfs_func9

typedef struct vfs_func9_args
{
   //fields are yet unknown
}vfs_func9_args;

int vfs_func9(vfs_func9_args* ctx)

vfs_func10

typedef struct vfs_func10_args
{
   //fields are yet unknown
}vfs_func10_args;

int vfs_func10(vfs_func10_args* ctx)

vfs_func12

Version NID
3.60 0xB07B307D 

int vfs_func12(vfs_mount* mount, const char *dev, unsigned int cmd, void *indata, int inlen, void *outdata, int outlen);

typedef struct vfs_func12_args
{
   uint32_t unk_0;
   uint32_t unk_4;
   uint32_t unk_8; // some switch number
   char* name;

   uint32_t nameLength;
   uint32_t unk_14;
   uint32_t unk_18;

   //more fields ?

}vfs_func12_args;

vfs_func13

Version NID
3.60 0xF7DAC0F5 
typedef struct vfs_func13_args
{
   uint32_t unk_0;
   char* blockDeviceName;
   uint32_t unk_8;
   uint32_t unk_C;

   char* numericName;
   uint32_t blockDeviceNameLength;
   uint32_t* numericNameLength;
}vfs_func13_args;

int vfs_func13(vfs_func13_args* ctx)

SceIofilemgrForDriver vfs node callbacks

It looks like vfs callbacks are exported. Callbacks can be identified using these steps:

  • Find all functions that contain indirect calls
  • Locate only calls that use address, taken from table, that is pointed by vfs_node (offset 0x40, then valid offset inside pointer table)
  • Trace back to first exported function (usually this is single export, not far away in call stack)
  • Turns out ScePfsMgr and SceExfatfs use these exports from their vfs node function callbacks, so this information can be mapped/matched.

vfs_node_func1

Version NID
3.60 0x76B79BEC 
int vfs_node_func1(vfs_node *node, vnf1_arg1* dev, int unk2, int unk3);

struct vnf1_arg1
{
  char* blockDevice;
  uint32_t nameLength;
  char* unixMount;
}vnf1_arg1;

//this type applies only to SceSdif

struct vnf1_arg3
{
  uint32_t unk_0;
  uint32_t unk_4;
  uint32_t unk_8;
  uint32_t unk_C;

  uint32_t unk_10;
  uint32_t unk_14;
  uint32_t unk_18;
  uint32_t unk_1C;

  sd_stor_device_handle* handle;

  //not sure about size, can be more fields ?

}vnf1_arg3;

struct vfs_node_func1_args
{
   vfs_node* node;
   vnf1_arg1* arg1; //ignored (applies to SceSdif)
   uint32_t arg2;
   vnf1_arg3* arg3; //result (applies to SceSdif)
}vfs_node_func1_args;

arguments are packed into vfs_node_func1_args and passed to vfs_node_func1 callback

vfs_node_func2

Version NID
3.60 0x9E347C7D 
int vfs_node_func2(vfs_node *node, int unk1, int unk2, int unk3, int arg_0);

struct vfs_node_func2_args
{
   vfs_node* node;
   uint32_t arg1;
   uint32_t arg2;
   uint32_t arg3;
   uint32_t arg_0;
}vfs_node_func2_args;

arguments are packed into vfs_node_func2_args and passed to vfs_node_func2 callback

vfs_node_func3 (sceVfsCloseForDriver)

Version NID
3.60 0x40944C2E 
int vfs_node_func3(vfs_node *node, void *objectBase);

struct vfs_node_func3_args
{
   vfs_node* node;
   void *objectBase;
}vfs_node_func3_args;

arguments are packed into vfs_node_func3_args and passed to vfs_node_func3 callback

vfs_node_func4

Version NID
3.60 0xA5A6A55C 
int vfs_node_func4(vfs_node *node, vfs_node** new_node, vnf4_arg2* dev, int unk3);

struct vnf4_arg2
{
   char* blockDeviceName;
   int nameLength;
} vnf4_arg2;

struct vfs_node_func4_args
{
   vfs_node* node; 
   vfs_node** new_node; //result
   vnf4_arg2* dev;
   uint32_t arg3; //ignored (applies to SceSdif)
}vfs_node_func4_args;

arguments are packed into vfs_node_func4_args and passed to vfs_node_func4 callback

vfs_node_func5 (sceVfsReadForDriver)

Version NID
3.60 0x570388A5 
int vfs_node_func5(vfs_node *n0, void *objectBase, void *data, SceSize size, int *nBytesRead);

struct vfs_node_func5_args
{
   vfs_node* node;
   void* objectBase;
   void* data;
   SceSize size;
}vfs_node_func5_args;

arguments are packed into vfs_node_func5_args and passed to vfs_node_func5 callback

vfs_node_func6 (sceVfsWriteForDriver)

Version NID
3.60 0x9A68378D 
int vfs_node_func6(vfs_node *n0, void *objectBase, const void *data, SceSize size, int *nBytesWritten);

struct vfs_node_func6_args
{
   vfs_node* node;
   void* objectBase;
   const void* data;
   SceSize size;
}vfs_node_func6_args;

arguments are packed into vfs_node_func6_args and passed to vfs_node_func6 callback

vfs_node_func7 (sceVfsLseekForDriver)

Version NID
3.60 0xB2B13818 
int vfs_node_func7(vfs_node *node, void* objectBase, SceOff offset, int whence);

struct vfs_node_func7_args
{
   vfs_node* node;
   void* objectBase;
   SceOff offset;
   int whence;
}vfs_node_func7_args;

arguments are packed into vfs_node_func7_args and passed to vfs_node_func7 callback

vfs_node_func8 (sceVfsIoctlForDriver)

Version NID
3.60 0x333C904D 
int vfs_node_func8(vfs_node* node, void* objectBase, unsigned int cmd, void *indata, int inlen, void *outdata, int outlen);

struct vfs_node_func8_args
{
   vfs_node* node;
   void* objectBase;
   unsigned int cmd;
   void *indata;
   int inlen;
   void *outdata;
   int outlen;
}vfs_node_func8_args;

arguments are packed into vfs_node_func8_args and passed to vfs_node_func8 callback

vfs_node_func9

Version NID
3.60 0xDC1E7EE4 
int vfs_node_func9(vfs_node *node0, vfs_node *node1, void *ctx, int unk);

need to confirm this type with dump

typedef struct vnf9_arg2 //most likely this type is also vfs_node (same partial layout of fields)
{
   char* blockDeviceName;
   int nameLength;
   uint32_t unk_8;
   uint32_t unk_C;
   
   uint32_t unk_10;
   uint32_t unk_14;
   uint32_t unk_18;
   uint32_t unk_1C;
   
   uint32_t unk_20;
   uint32_t unk_24;
   uint32_t unk_28;
   uint32_t unk_2C;
   
   uint32_t unk_30;
   uint32_t unk_34;
   uint32_t unk_38;
   uint32_t unk_3C;
   
   uint32_t unk_40;
   uint32_t unk_44;
   partition_entry** unk_48;
}vnf9_arg2;

struct vfs_node_func9_args
{
   vfs_node* node0;
   vfs_node* node1;
   vnf9_arg2* arg2;
   uint32_t arg3; //ignored (applies to SceSdif)
}vfs_node_func9_args;

arguments are packed into vfs_node_func9_args and passed to vfs_node_func9 callback

vfs_node_func10 (sceVfsMkdirForDriver)

Version NID
3.60 0x2F3F8C70 
int vfs_node_func10(vfs_node* node, vfs_node** new_node, void *unk2, SceMode mode);

struct vfs_node_func10_args
{
   vfs_node* node;
   vfs_node** new_node;
   void *unk2;
   SceMode mode;
}vfs_node_func10_args;

arguments are packed into vfs_node_func10_args and passed to vfs_node_func10 callback

vfs_node_func11 (sceVfsRmdirForDriver)

Version NID
3.60 0x1D551105 
int vfs_node_func11(vfs_node* node, vfs_node* new_node, vfs_node_func11_opts* opts, int unused);

typedef struct vfs_node_func11_opts //size is 0xC
{
   uint32_t unk_0;
   uint32_t unk_4;
   uint32_t unk_8;

}vfs_node_func11_opts;

struct vfs_node_func11_args
{
   vfs_node* node;
   vfs_node* new_node;
   vfs_node_func11_opts* opts;
}vfs_node_func11_args;

arguments are packed into vfs_node_func11_args and passed to vfs_node_func11 callback

vfs_node_func12 (sceVfsDopenForDriver)

Version NID
3.60 0x00C9C2DD 
int vfs_node_func12(vfs_node* node, vfs_node_func12_opts* opts, void* objectBase);

typedef struct vfs_node_func12_opts //size is 0xC
{
   uint32_t unk_0;
   uint32_t unk_4;
   uint32_t unk_8;

}vfs_node_func12_opts;

struct vfs_node_func12_args
{
   vfs_node* node;
   vfs_node_func12_opts* opts;
   void* objectBase;
}vfs_node_func12_args;

arguments are packed into vfs_node_func12_args and passed to vfs_node_func12 callback

vfs_node_func13 (sceVfsDcloseForDriver)

Version NID
3.60 0x1350F5C7 
int vfs_node_func13(vfs_node* node, void* objectBase);

struct vfs_node_func13_args
{
   vfs_node* node;
   void* objectBase;
}vfs_node_func13_args;

arguments are packed into vfs_node_func13_args and passed to vfs_node_func13 callback

vfs_node_func14 (sceVfsDreadForDriver)

Version NID
3.60 0x77584C8F 
int vfs_node_func14(vfs_node* node, void* objectBase, SceIoDirent* dir);

struct vfs_node_func14_args
{
   vfs_node* node;
   void* objectBase;
   SceIoDirent* dir;
}vfs_node_func14_args;

arguments are packed into vfs_node_func14_args and passed to vfs_node_func14 callback

vfs_node_func15 (sceVfsGetstatForDriver)

Version NID
3.60 0x50A63ACF 
int vfs_node_func15(vfs_node* node, vfs_node_func15_opts* opts, SceIoStat* stat);

typedef struct vfs_node_func15_opts //size is 0xC
{
   uint32_t unk_0;
   uint32_t unk_4;
   uint32_t unk_8;

}vfs_node_func15_opts;

struct vfs_node_func15_args
{
   vfs_node* node;
   vfs_node_func15_opts* opts;
   SceIoStat* stat;
}vfs_node_func15_args;

arguments are packed into vfs_node_func15_args and passed to vfs_node_func15 callback

vfs_node_func16 (sceVfsChstatForDriver)

Version NID
3.60 0x1974FA92 
int vfs_node_func16(vfs_node* node, vfs_node_func16_opts* opts, SceIoStat *stat, int bits);

typedef struct vfs_node_func16_opts //size is 0xC
{
   uint32_t unk_0;
   uint32_t unk_4;
   uint32_t unk_8;

}vfs_node_func16_opts;

struct vfs_node_func16_args
{
   vfs_node* node;
   vfs_node_func16_opts* opts;
   SceIoStat *stat;
   int bits;
}vfs_node_func16_args;

arguments are packed into vfs_node_func16_args and passed to vfs_node_func16 callback

vfs_node_func17 (sceVfsRenameForDriver)

Version NID
3.60 0x36A794C7 
int vfs_node_func17(vfs_node* new_node0, vfs_node* node0, vfs_node_func16_opts0* opt0, vfs_node* new_node1, vfs_node** node1, vfs_node_func16_opts* opt1);

typedef struct vfs_node_func16_opts0 //size is 0x10
{
   uint32_t unk_0;
   uint32_t unk_4;
   uint32_t unk_8;
   uint32_t unk_C;
}vfs_node_func16_opts0;

typedef struct vfs_node_func16_opts1 //size is 0x10
{
   uint32_t unk_0;
   uint32_t unk_4;
   uint32_t unk_8;
   uint32_t unk_C;
}vfs_node_func16_opts1;

struct vfs_node_func17_args
{
   vfs_node* new_node0;
   vfs_node* node0;
   vfs_node_func16_opts0* opt0;
   vfs_node* new_node1;
   vfs_node** node1;
   vfs_node_func16_opts* opt1;
}vfs_node_func17_args;

arguments are packed into vfs_node_func17_args and passed to vfs_node_func17 callback

vfs_node_func19 (sceVfsPreadForDriver)

Version NID
3.60 0xABBC80E3 
int vfs_node_func19(vfs_node *n0, void *objectBase, char *data, int size, SceOff offset, int *nBytesRead);

struct vfs_node_func19_args
{
   vfs_node* node;
   void* objectBase;
   void* data;
   SceSize size;
   SceOff offset;
}vfs_node_func19_args;

arguments are packed into vfs_node_func19_args and passed to vfs_node_func19 callback

vfs_node_func20 (sceVfsPwriteForDriver)

Version NID
3.60 0xA53C040D 
int vfs_node_func20(vfs_node *n0, void *objectBase, void *data, int size, SceOff offset, int *nBytesWritten);

struct vfs_node_func20_args
{
   vfs_node* node;
   void* objectBase;
   const void* data;
   SceSize size;
   SceOff offset;
}vfs_node_func20_args;

arguments are packed into vfs_node_func20_args and passed to vfs_node_func20 callback

vfs_node_func21

Version NID
3.60 0x8FB94521 
int vfs_node_func21(vfs_node *node);

struct vfs_node_func21_args
{
   vfs_node* node;
}vfs_node_func21_args;

arguments are packed into vfs_node_func21_args and passed to vfs_node_func21 callback

vfs_node_func22 (sceVfsNodeFunction22ForDriver)

Version NID
3.60 0x942AA61F 
int vfs_node_func22(vfs_node *node, void* unk1);

struct vfs_node_func22_args
{
   vfs_node* node;
   void* unk1; //this is probably vfs_node* as well
}vfs_node_func22_args;

arguments are packed into vfs_node_func22_args and passed to vfs_node_func22 callback

vfs_node_func23 (sceVfsNodeFunction23ForDriver)

Version NID
3.60 0x0D8A806E 
int vfs_node_func23(vfs_node *node, void* unk1);

struct vfs_node_func23_args
{
   vfs_node* node;
   void* unk1; //this is probably vfs_node* as well
}vfs_node_func23_args;

arguments are packed into vfs_node_func23_args and passed to vfs_node_func23 callback

vfs_node_func24 (sceVfsSyncForDriver)

Version NID
3.60 0x9CD96406 
int vfs_node_func24(vfs_node *node, void *objectBase, int flag);

struct vfs_node_func24_args
{
   vfs_node* node;
   void *objectBase;
   int flag;
}vfs_node_func24_args;

arguments are packed into vfs_node_func24_args and passed to vfs_node_func24 callback

vfs_node_func25 (sceVfsGetstatByFdForDriver)

Version NID
3.60 0x1DBCBB01 

int vfs_node_func25(vfs_node *node, void* objectBase, SceIoStat *stat);

struct vfs_node_func25_args
{
   vfs_node* node;
   void* objectBase;
   SceIoStat *stat;
}vfs_node_func25_args;

arguments are packed into vfs_node_func25_args and passed to vfs_node_func25 callback

vfs_node_func26 (sceVfsChstatByFdForDriver)

Version NID
3.60 0x082AFD7F 
int vfs_node_func26(vfs_node *node, void *objectBase, SceIoStat *stat, int bits);

struct vfs_node_func26_args
{
   vfs_node* node;
   void *objectBase;
   SceIoStat *stat;
   int bits;
}vfs_node_func26_args;

arguments are packed into vfs_node_func26_args and passed to vfs_node_func26 callback

vfs_node_func27 (sceVfsRemoveForDriver)

Version NID
3.60 0xF53399BC 
int vfs_node_func27(vfs_node* new_node, vfs_node* node, void* unk2, void* mem_chunk);

struct vfs_node_func27_args
{
   vfs_node* new_node;
   vfs_node* node;
   void* unk2;
   void* mem_chunk; // block of size 0x400. has "SCEDEL~" string in the beginning.
   uint32_t unk_10; // = 0
   uint32_t unk_14; // = 0
}vfs_node_func27_args;

arguments are packed into vfs_node_func27_args and passed to vfs_node_func27 callback

vfs_node_func28 (sceVfsNodeFunction28ForDriver)

Version NID
3.60 0x0F7E1718

Looks like the purpose of this function is to close some resource by SceUID like sceIoCloseForDriver or sceIoDcloseForDriver. 

int vfs_node_func28(vfs_node *node, void *objectBase, int unused0, int unused1);

struct vfs_node_func28_args
{
   vfs_node* node;
   uint32_t objectBase;
   uint32_t unk_8; // = 0
   uint32_t unk_C; // = 0
}vfs_node_func28_args;

arguments are packed into vfs_node_func28_args and passed to vfs_node_func28 callback

vfs_node_func29 (sceVfsNodeFunction29ForDriver)

Version NID
3.60 0xEEAE8B51 
int vfs_node_func29(vfs_node* node, SceInt64 unk1, SceInt64 unk2, int arg_8, int arg_C);

struct vfs_node_func29_args
{
   vfs_node* node;
   uint32_t dummy; //alignment
   SceInt64 unk1;
   SceInt64 unk2;
   uint32_t arg_8;
   uint32_t arg_C;
}vfs_node_func29_args;

arguments are packed into vfs_node_func29_args and passed to vfs_node_func29 callback

Retrieved from "http://wiki.henkaku.xyz/index.php?title=VFS_Implementation&oldid=4988"