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dll: fuseintf: ReadDirectory implementation

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This commit is contained in:
Bill Zissimopoulos 2016-06-10 16:02:28 -07:00
parent 240bdfeb39
commit 009728e2b7
1 changed files with 52 additions and 10 deletions
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62
src/dll/fuse/fuseintf.c
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@ -718,13 +718,15 @@ struct fuse_dirhandle
{ {
FSP_FILE_SYSTEM *FileSystem; FSP_FILE_SYSTEM *FileSystem;
char *PosixPath, *PosixName; char *PosixPath, *PosixName;
PVOID OriginalBuffer;
ULONG OriginalLength;
PVOID Buffer; PVOID Buffer;
ULONG Length; ULONG Length;
ULONG BytesTransferred; ULONG BytesTransferred;
}; };
int fsp_fuse_intf_AddDirInfoCommon(void *buf, const char *name, int fsp_fuse_intf_AddDirInfo(void *buf, const char *name,
const struct fuse_stat *stbuf, fuse_off_t off, BOOLEAN GrowBuffer) const struct fuse_stat *stbuf, fuse_off_t off)
{ {
struct fuse_dirhandle *dh = buf; struct fuse_dirhandle *dh = buf;
UINT32 Uid, Gid, Mode; UINT32 Uid, Gid, Mode;
@ -789,7 +791,33 @@ int fsp_fuse_intf_AddDirInfoCommon(void *buf, const char *name,
DirInfo->Size = (UINT16)(sizeof(FSP_FSCTL_DIR_INFO) + Size); DirInfo->Size = (UINT16)(sizeof(FSP_FSCTL_DIR_INFO) + Size);
DirInfo->NextOffset = off; DirInfo->NextOffset = off;
if (GrowBuffer) /*
* FUSE readdir documentation quote:
*
* The filesystem may choose between two modes of operation:
*
* 1) The readdir implementation ignores the offset parameter, and
* passes zero to the filler function's offset. The filler
* function will not return '1' (unless an error happens), so the
* whole directory is read in a single readdir operation. This
* works just like the old getdir() method.
*
* 2) The readdir implementation keeps track of the offsets of the
* directory entries. It uses the offset parameter and always
* passes non-zero offset to the filler function. When the buffer
* is full (or an error happens) the filler function will return
* '1'.
*/
if (0 != off)
{
if (0 == dh->Buffer)
{
dh->Buffer = dh->OriginalBuffer;
dh->Length = dh->OriginalLength;
}
}
else if (dh->OriginalBuffer != dh->Buffer)
{ {
DirInfo->NextOffset = dh->BytesTransferred + FSP_FSCTL_DEFAULT_ALIGN_UP(DirInfo->Size); DirInfo->NextOffset = dh->BytesTransferred + FSP_FSCTL_DEFAULT_ALIGN_UP(DirInfo->Size);
@ -816,16 +844,10 @@ int fsp_fuse_intf_AddDirInfoCommon(void *buf, const char *name,
return ! FspFileSystemAddDirInfo(DirInfo, dh->Buffer, dh->Length, &dh->BytesTransferred); return ! FspFileSystemAddDirInfo(DirInfo, dh->Buffer, dh->Length, &dh->BytesTransferred);
} }
int fsp_fuse_intf_AddDirInfo(void *buf, const char *name,
const struct fuse_stat *stbuf, fuse_off_t off)
{
return fsp_fuse_intf_AddDirInfoCommon(buf, name, stbuf, off, TRUE);
}
int fsp_fuse_intf_AddDirInfoOld(fuse_dirh_t dh, const char *name, int fsp_fuse_intf_AddDirInfoOld(fuse_dirh_t dh, const char *name,
int type, fuse_ino_t ino) int type, fuse_ino_t ino)
{ {
return fsp_fuse_intf_AddDirInfoCommon(dh, name, 0, 0, TRUE) ? -ENOMEM : 0; return fsp_fuse_intf_AddDirInfo(dh, name, 0, 0) ? -ENOMEM : 0;
} }
static NTSTATUS fsp_fuse_intf_ReadDirectory(FSP_FILE_SYSTEM *FileSystem, static NTSTATUS fsp_fuse_intf_ReadDirectory(FSP_FILE_SYSTEM *FileSystem,
@ -863,6 +885,9 @@ static NTSTATUS fsp_fuse_intf_ReadDirectory(FSP_FILE_SYSTEM *FileSystem,
dh.PosixPath[Size++] = '/'; dh.PosixPath[Size++] = '/';
dh.PosixName = dh.PosixPath + Size; dh.PosixName = dh.PosixPath + Size;
dh.OriginalBuffer = Buffer;
dh.OriginalLength = Length;
if (0 != f->ops.readdir) if (0 != f->ops.readdir)
{ {
memset(&fi, 0, sizeof fi); memset(&fi, 0, sizeof fi);
@ -885,8 +910,25 @@ static NTSTATUS fsp_fuse_intf_ReadDirectory(FSP_FILE_SYSTEM *FileSystem,
if (NT_SUCCESS(Result)) if (NT_SUCCESS(Result))
{ {
if (dh.OriginalBuffer == dh.Buffer)
{
*PBytesTransferred = dh.BytesTransferred;
return STATUS_SUCCESS;
}
if (0 == dh.Buffer)
{
*PBytesTransferred = dh.BytesTransferred;
/* EOF */
FspFileSystemAddDirInfo(0, Buffer, Length, PBytesTransferred);
return STATUS_SUCCESS;
}
filedesc->DirBuffer = dh.Buffer; filedesc->DirBuffer = dh.Buffer;
filedesc->DirBufferSize = dh.BytesTransferred; filedesc->DirBufferSize = dh.BytesTransferred;
/* fall through! */
} }
else else
{ {