/**
* FSAL_write:
* Perform a write operation on an opened file.
*
* \param file_descriptor (input):
* The file descriptor returned by FSAL_open.
* \param seek_descriptor (optional input):
* Specifies the position where data is to be written.
* If not specified, data will be written at the current position.
* \param buffer_size (input):
* Amount (in bytes) of data to be written.
* \param buffer (input):
* Address in memory of the data to write to file.
* \param write_amount (output):
* Pointer to the amount of data (in bytes) that have been written
* during this call.
*
* \return Major error codes:
* - ERR_FSAL_NO_ERROR (no error)
* - ERR_FSAL_INVAL (invalid parameter)
* - ERR_FSAL_NOT_OPENED (tried to write in a non-opened zfsfsal_file_t)
* - ERR_FSAL_FAULT (a NULL pointer was passed as mandatory argument)
* - Other error codes can be returned :
* ERR_FSAL_IO, ERR_FSAL_NOSPC, ERR_FSAL_DQUOT...
*/
fsal_status_t ZFSFSAL_write(zfsfsal_file_t * file_descriptor, /* IN */
fsal_seek_t * seek_descriptor, /* IN */
fsal_size_t buffer_size, /* IN */
caddr_t buffer, /* IN */
fsal_size_t * write_amount /* OUT */
)
{
int rc, behind = 0;
off_t offset;
/* sanity checks. */
if(!file_descriptor || !buffer || !write_amount)
Return(ERR_FSAL_FAULT, 0, INDEX_FSAL_write);
TakeTokenFSCall();
if(seek_descriptor)
{
switch(seek_descriptor->whence)
{
case FSAL_SEEK_CUR:
offset = file_descriptor->current_offset + seek_descriptor->offset;
break;
case FSAL_SEEK_SET:
offset = seek_descriptor->offset;
break;
case FSAL_SEEK_END:
behind = 1;
offset = seek_descriptor->offset;
break;
}
}
rc = libzfswrap_write(file_descriptor->p_vfs, &file_descriptor->cred, file_descriptor->p_vnode, buffer, buffer_size, behind, offset);
ReleaseTokenFSCall();
/* >> interpreted returned status << */
if(rc)
Return(posix2fsal_error(rc), 0, INDEX_FSAL_write);
/* >> dont forget setting output vars : write_amount << */
*write_amount = buffer_size;
Return(ERR_FSAL_NO_ERROR, 0, INDEX_FSAL_write);
}
/**
* FSAL_write:
* Perform a write operation on an opened file.
*
* \param file_descriptor (input):
* The file descriptor returned by FSAL_open.
* \param p_context (input):
* Authentication context for the operation (user,...).
* \param seek_descriptor (optional input):
* Specifies the position where data is to be written.
* If not specified, data will be written at the current position.
* \param buffer_size (input):
* Amount (in bytes) of data to be written.
* \param buffer (input):
* Address in memory of the data to write to file.
* \param write_amount (output):
* Pointer to the amount of data (in bytes) that have been written
* during this call.
*
* \return Major error codes:
* - ERR_FSAL_NO_ERROR (no error)
* - ERR_FSAL_INVAL (invalid parameter)
* - ERR_FSAL_NOT_OPENED (tried to write in a non-opened zfsfsal_file_t)
* - ERR_FSAL_FAULT (a NULL pointer was passed as mandatory argument)
* - Other error codes can be returned :
* ERR_FSAL_IO, ERR_FSAL_NOSPC, ERR_FSAL_DQUOT...
*/
fsal_status_t ZFSFSAL_write(fsal_file_t * file_desc, /* IN */
fsal_op_context_t * p_context, /* IN */
fsal_seek_t * seek_descriptor, /* IN */
fsal_size_t buffer_size, /* IN */
caddr_t buffer, /* IN */
fsal_size_t * write_amount /* OUT */
)
{
int rc, behind = 0;
off_t offset;
zfsfsal_file_t * file_descriptor = (zfsfsal_file_t *)file_desc;
/* sanity checks. */
if(!file_descriptor || !buffer || !write_amount)
Return(ERR_FSAL_FAULT, 0, INDEX_FSAL_write);
/* Hook to prevent writing into a snapshot */
if(file_descriptor->handle.data.i_snap != 0)
{
LogDebug(COMPONENT_FSAL, "Trying to write to a file inside a snapshot");
Return(ERR_FSAL_ROFS, 0, INDEX_FSAL_write);
}
TakeTokenFSCall();
if(seek_descriptor)
{
switch(seek_descriptor->whence)
{
case FSAL_SEEK_CUR:
offset = file_descriptor->current_offset + seek_descriptor->offset;
break;
case FSAL_SEEK_SET:
offset = seek_descriptor->offset;
break;
case FSAL_SEEK_END:
behind = 1;
offset = seek_descriptor->offset;
break;
}
}
/* Test that the vfs still exist */
ZFSFSAL_VFS_RDLock();
libzfswrap_vfs_t *p_vfs = ZFSFSAL_GetVFS(&file_descriptor->handle);
if(!p_vfs)
{
ZFSFSAL_VFS_Unlock();
ReleaseTokenFSCall();
Return(ERR_FSAL_NOENT, 0, INDEX_FSAL_write);
}
rc = libzfswrap_write(p_vfs, &file_descriptor->cred, file_descriptor->p_vnode, buffer, buffer_size, behind, offset);
ZFSFSAL_VFS_Unlock();
ReleaseTokenFSCall();
/* >> interpreted returned status << */
if(rc)
Return(posix2fsal_error(rc), 0, INDEX_FSAL_write);
/* >> dont forget setting output vars : write_amount << */
*write_amount = buffer_size;
Return(ERR_FSAL_NO_ERROR, 0, INDEX_FSAL_write);
}
